commit 7c35d5c
dalem
·
2025-12-20 20:09:41 +0000 UTC
parent 929b5e5
add wallpaper supporttt :3 this was the initial wallpaper implementation using stb image header. it has since been changed and mostly moved to the client.
6 files changed,
+8066,
-3
M
Makefile
+1,
-0
1@@ -170,6 +170,7 @@ SWC_SOURCES= \
2 libswc/swc.c \
3 libswc/util.c \
4 libswc/view.c \
5+ libswc/wallpaper.c \
6 libswc/wayland_buffer.c \
7 libswc/window.c \
8 libswc/xdg_decoration.c \
+6,
-2
1@@ -283,10 +283,14 @@ renderer_repaint(struct target *target, pixman_region32_t *damage, pixman_region
2
3 wld_set_target_surface(swc.drm->renderer, target->surface);
4
5- /* Paint base damage black. */
6 if (pixman_region32_not_empty(base_damage)) {
7 pixman_region32_translate(base_damage, -target->view->geometry.x, -target->view->geometry.y);
8- wld_fill_region(swc.drm->renderer, 0xff000000, base_damage);
9+
10+ if(wallbuf)
11+ wld_copy_region(swc.drm->renderer, wallbuf, 0, 0, base_damage);
12+
13+ else
14+ wld_fill_region(swc.drm->renderer, bgcolor, base_damage);
15 }
16
17 wl_list_for_each_reverse (view, views, link) {
+23,
-0
1@@ -410,6 +410,29 @@ int swc_add_axis_binding(uint32_t modifiers, uint32_t axis, swc_axis_binding_han
2
3 /* }}} */
4
5+/* Wallpaper {{{ */
6+
7+extern unsigned char *wallpaper;
8+extern struct wld_buffer *wallbuf;
9+
10+/**
11+ * Set wallpaper to image from fs path.
12+ * TODO: scaling, tiling, maybe diff image for each screen
13+ */
14+
15+void swc_wallpaper_init(char* path);
16+
17+/**
18+ * Set wallpaper to a single color
19+ * pretty much ignored if wallpaper is set to image
20+ * defaults to black
21+ */
22+
23+extern uint32_t bgcolor;
24+void swc_wallpaper_color_set(uint32_t color);
25+
26+/* }}} */
27+
28 /**
29 * This is a user-provided structure that swc will use to notify the display
30 * server of new windows, screens and input devices.
+48,
-0
1@@ -0,0 +1,48 @@
2+#include <pixman.h>
3+#include <wld/wld.h>
4+
5+#define STB_IMAGE_IMPLEMENTATION
6+#define STBI_NO_HDR
7+#include "../stb/stb_image.h"
8+
9+#include "swc.h"
10+#include "internal.h"
11+#include "drm.h"
12+#include "util.h"
13+#include "shm.h"
14+
15+unsigned char *wallpaper = NULL;
16+struct wld_buffer *wallbuf = NULL;
17+
18+uint32_t bgcolor = 0xff000000;
19+
20+EXPORT void
21+swc_wallpaper_init(char* path)
22+{
23+ int width, height, chan;
24+
25+ wallpaper = stbi_load(path, &width, &height, &chan, 4);
26+
27+ /* swap color channels to be compatible */
28+ for(int i = 0; i < width * height; i++) {
29+ unsigned char r = wallpaper[i*4];
30+ wallpaper[i*4] = wallpaper[(i*4)+2];
31+ wallpaper[(i*4)+2] = r;
32+ }
33+
34+ union wld_object obj;
35+ obj.ptr = (uint32_t*)wallpaper;
36+
37+ wallbuf = wld_import_buffer(swc.shm->context,
38+ WLD_OBJECT_DATA,
39+ obj,
40+ width, height,
41+ WLD_FORMAT_ARGB8888,
42+ width * 4);
43+}
44+
45+EXPORT void
46+swc_wallpaper_color_set(uint32_t color)
47+{
48+ bgcolor = color;
49+}
+7988,
-0
1@@ -0,0 +1,7988 @@
2+/* stb_image - v2.30 - public domain image loader - http://nothings.org/stb
3+ no warranty implied; use at your own risk
4+
5+ Do this:
6+ #define STB_IMAGE_IMPLEMENTATION
7+ before you include this file in *one* C or C++ file to create the implementation.
8+
9+ // i.e. it should look like this:
10+ #include ...
11+ #include ...
12+ #include ...
13+ #define STB_IMAGE_IMPLEMENTATION
14+ #include "stb_image.h"
15+
16+ You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
17+ And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
18+
19+
20+ QUICK NOTES:
21+ Primarily of interest to game developers and other people who can
22+ avoid problematic images and only need the trivial interface
23+
24+ JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
25+ PNG 1/2/4/8/16-bit-per-channel
26+
27+ TGA (not sure what subset, if a subset)
28+ BMP non-1bpp, non-RLE
29+ PSD (composited view only, no extra channels, 8/16 bit-per-channel)
30+
31+ GIF (*comp always reports as 4-channel)
32+ HDR (radiance rgbE format)
33+ PIC (Softimage PIC)
34+ PNM (PPM and PGM binary only)
35+
36+ Animated GIF still needs a proper API, but here's one way to do it:
37+ http://gist.github.com/urraka/685d9a6340b26b830d49
38+
39+ - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
40+ - decode from arbitrary I/O callbacks
41+ - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
42+
43+ Full documentation under "DOCUMENTATION" below.
44+
45+
46+LICENSE
47+
48+ See end of file for license information.
49+
50+RECENT REVISION HISTORY:
51+
52+ 2.30 (2024-05-31) avoid erroneous gcc warning
53+ 2.29 (2023-05-xx) optimizations
54+ 2.28 (2023-01-29) many error fixes, security errors, just tons of stuff
55+ 2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes
56+ 2.26 (2020-07-13) many minor fixes
57+ 2.25 (2020-02-02) fix warnings
58+ 2.24 (2020-02-02) fix warnings; thread-local failure_reason and flip_vertically
59+ 2.23 (2019-08-11) fix clang static analysis warning
60+ 2.22 (2019-03-04) gif fixes, fix warnings
61+ 2.21 (2019-02-25) fix typo in comment
62+ 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs
63+ 2.19 (2018-02-11) fix warning
64+ 2.18 (2018-01-30) fix warnings
65+ 2.17 (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings
66+ 2.16 (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes
67+ 2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC
68+ 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
69+ 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes
70+ 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
71+ 2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64
72+ RGB-format JPEG; remove white matting in PSD;
73+ allocate large structures on the stack;
74+ correct channel count for PNG & BMP
75+ 2.10 (2016-01-22) avoid warning introduced in 2.09
76+ 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
77+
78+ See end of file for full revision history.
79+
80+
81+ ============================ Contributors =========================
82+
83+ Image formats Extensions, features
84+ Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info)
85+ Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info)
86+ Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG)
87+ Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks)
88+ Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG)
89+ Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip)
90+ Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD)
91+ github:urraka (animated gif) Junggon Kim (PNM comments)
92+ Christopher Forseth (animated gif) Daniel Gibson (16-bit TGA)
93+ socks-the-fox (16-bit PNG)
94+ Jeremy Sawicki (handle all ImageNet JPGs)
95+ Optimizations & bugfixes Mikhail Morozov (1-bit BMP)
96+ Fabian "ryg" Giesen Anael Seghezzi (is-16-bit query)
97+ Arseny Kapoulkine Simon Breuss (16-bit PNM)
98+ John-Mark Allen
99+ Carmelo J Fdez-Aguera
100+
101+ Bug & warning fixes
102+ Marc LeBlanc David Woo Guillaume George Martins Mozeiko
103+ Christpher Lloyd Jerry Jansson Joseph Thomson Blazej Dariusz Roszkowski
104+ Phil Jordan Dave Moore Roy Eltham
105+ Hayaki Saito Nathan Reed Won Chun
106+ Luke Graham Johan Duparc Nick Verigakis the Horde3D community
107+ Thomas Ruf Ronny Chevalier github:rlyeh
108+ Janez Zemva John Bartholomew Michal Cichon github:romigrou
109+ Jonathan Blow Ken Hamada Tero Hanninen github:svdijk
110+ Eugene Golushkov Laurent Gomila Cort Stratton github:snagar
111+ Aruelien Pocheville Sergio Gonzalez Thibault Reuille github:Zelex
112+ Cass Everitt Ryamond Barbiero github:grim210
113+ Paul Du Bois Engin Manap Aldo Culquicondor github:sammyhw
114+ Philipp Wiesemann Dale Weiler Oriol Ferrer Mesia github:phprus
115+ Josh Tobin Neil Bickford Matthew Gregan github:poppolopoppo
116+ Julian Raschke Gregory Mullen Christian Floisand github:darealshinji
117+ Baldur Karlsson Kevin Schmidt JR Smith github:Michaelangel007
118+ Brad Weinberger Matvey Cherevko github:mosra
119+ Luca Sas Alexander Veselov Zack Middleton [reserved]
120+ Ryan C. Gordon [reserved] [reserved]
121+ DO NOT ADD YOUR NAME HERE
122+
123+ Jacko Dirks
124+
125+ To add your name to the credits, pick a random blank space in the middle and fill it.
126+ 80% of merge conflicts on stb PRs are due to people adding their name at the end
127+ of the credits.
128+*/
129+
130+#ifndef STBI_INCLUDE_STB_IMAGE_H
131+#define STBI_INCLUDE_STB_IMAGE_H
132+
133+// DOCUMENTATION
134+//
135+// Limitations:
136+// - no 12-bit-per-channel JPEG
137+// - no JPEGs with arithmetic coding
138+// - GIF always returns *comp=4
139+//
140+// Basic usage (see HDR discussion below for HDR usage):
141+// int x,y,n;
142+// unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
143+// // ... process data if not NULL ...
144+// // ... x = width, y = height, n = # 8-bit components per pixel ...
145+// // ... replace '0' with '1'..'4' to force that many components per pixel
146+// // ... but 'n' will always be the number that it would have been if you said 0
147+// stbi_image_free(data);
148+//
149+// Standard parameters:
150+// int *x -- outputs image width in pixels
151+// int *y -- outputs image height in pixels
152+// int *channels_in_file -- outputs # of image components in image file
153+// int desired_channels -- if non-zero, # of image components requested in result
154+//
155+// The return value from an image loader is an 'unsigned char *' which points
156+// to the pixel data, or NULL on an allocation failure or if the image is
157+// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
158+// with each pixel consisting of N interleaved 8-bit components; the first
159+// pixel pointed to is top-left-most in the image. There is no padding between
160+// image scanlines or between pixels, regardless of format. The number of
161+// components N is 'desired_channels' if desired_channels is non-zero, or
162+// *channels_in_file otherwise. If desired_channels is non-zero,
163+// *channels_in_file has the number of components that _would_ have been
164+// output otherwise. E.g. if you set desired_channels to 4, you will always
165+// get RGBA output, but you can check *channels_in_file to see if it's trivially
166+// opaque because e.g. there were only 3 channels in the source image.
167+//
168+// An output image with N components has the following components interleaved
169+// in this order in each pixel:
170+//
171+// N=#comp components
172+// 1 grey
173+// 2 grey, alpha
174+// 3 red, green, blue
175+// 4 red, green, blue, alpha
176+//
177+// If image loading fails for any reason, the return value will be NULL,
178+// and *x, *y, *channels_in_file will be unchanged. The function
179+// stbi_failure_reason() can be queried for an extremely brief, end-user
180+// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS
181+// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
182+// more user-friendly ones.
183+//
184+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
185+//
186+// To query the width, height and component count of an image without having to
187+// decode the full file, you can use the stbi_info family of functions:
188+//
189+// int x,y,n,ok;
190+// ok = stbi_info(filename, &x, &y, &n);
191+// // returns ok=1 and sets x, y, n if image is a supported format,
192+// // 0 otherwise.
193+//
194+// Note that stb_image pervasively uses ints in its public API for sizes,
195+// including sizes of memory buffers. This is now part of the API and thus
196+// hard to change without causing breakage. As a result, the various image
197+// loaders all have certain limits on image size; these differ somewhat
198+// by format but generally boil down to either just under 2GB or just under
199+// 1GB. When the decoded image would be larger than this, stb_image decoding
200+// will fail.
201+//
202+// Additionally, stb_image will reject image files that have any of their
203+// dimensions set to a larger value than the configurable STBI_MAX_DIMENSIONS,
204+// which defaults to 2**24 = 16777216 pixels. Due to the above memory limit,
205+// the only way to have an image with such dimensions load correctly
206+// is for it to have a rather extreme aspect ratio. Either way, the
207+// assumption here is that such larger images are likely to be malformed
208+// or malicious. If you do need to load an image with individual dimensions
209+// larger than that, and it still fits in the overall size limit, you can
210+// #define STBI_MAX_DIMENSIONS on your own to be something larger.
211+//
212+// ===========================================================================
213+//
214+// UNICODE:
215+//
216+// If compiling for Windows and you wish to use Unicode filenames, compile
217+// with
218+// #define STBI_WINDOWS_UTF8
219+// and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert
220+// Windows wchar_t filenames to utf8.
221+//
222+// ===========================================================================
223+//
224+// Philosophy
225+//
226+// stb libraries are designed with the following priorities:
227+//
228+// 1. easy to use
229+// 2. easy to maintain
230+// 3. good performance
231+//
232+// Sometimes I let "good performance" creep up in priority over "easy to maintain",
233+// and for best performance I may provide less-easy-to-use APIs that give higher
234+// performance, in addition to the easy-to-use ones. Nevertheless, it's important
235+// to keep in mind that from the standpoint of you, a client of this library,
236+// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all.
237+//
238+// Some secondary priorities arise directly from the first two, some of which
239+// provide more explicit reasons why performance can't be emphasized.
240+//
241+// - Portable ("ease of use")
242+// - Small source code footprint ("easy to maintain")
243+// - No dependencies ("ease of use")
244+//
245+// ===========================================================================
246+//
247+// I/O callbacks
248+//
249+// I/O callbacks allow you to read from arbitrary sources, like packaged
250+// files or some other source. Data read from callbacks are processed
251+// through a small internal buffer (currently 128 bytes) to try to reduce
252+// overhead.
253+//
254+// The three functions you must define are "read" (reads some bytes of data),
255+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
256+//
257+// ===========================================================================
258+//
259+// SIMD support
260+//
261+// The JPEG decoder will try to automatically use SIMD kernels on x86 when
262+// supported by the compiler. For ARM Neon support, you must explicitly
263+// request it.
264+//
265+// (The old do-it-yourself SIMD API is no longer supported in the current
266+// code.)
267+//
268+// On x86, SSE2 will automatically be used when available based on a run-time
269+// test; if not, the generic C versions are used as a fall-back. On ARM targets,
270+// the typical path is to have separate builds for NEON and non-NEON devices
271+// (at least this is true for iOS and Android). Therefore, the NEON support is
272+// toggled by a build flag: define STBI_NEON to get NEON loops.
273+//
274+// If for some reason you do not want to use any of SIMD code, or if
275+// you have issues compiling it, you can disable it entirely by
276+// defining STBI_NO_SIMD.
277+//
278+// ===========================================================================
279+//
280+// HDR image support (disable by defining STBI_NO_HDR)
281+//
282+// stb_image supports loading HDR images in general, and currently the Radiance
283+// .HDR file format specifically. You can still load any file through the existing
284+// interface; if you attempt to load an HDR file, it will be automatically remapped
285+// to LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
286+// both of these constants can be reconfigured through this interface:
287+//
288+// stbi_hdr_to_ldr_gamma(2.2f);
289+// stbi_hdr_to_ldr_scale(1.0f);
290+//
291+// (note, do not use _inverse_ constants; stbi_image will invert them
292+// appropriately).
293+//
294+// Additionally, there is a new, parallel interface for loading files as
295+// (linear) floats to preserve the full dynamic range:
296+//
297+// float *data = stbi_loadf(filename, &x, &y, &n, 0);
298+//
299+// If you load LDR images through this interface, those images will
300+// be promoted to floating point values, run through the inverse of
301+// constants corresponding to the above:
302+//
303+// stbi_ldr_to_hdr_scale(1.0f);
304+// stbi_ldr_to_hdr_gamma(2.2f);
305+//
306+// Finally, given a filename (or an open file or memory block--see header
307+// file for details) containing image data, you can query for the "most
308+// appropriate" interface to use (that is, whether the image is HDR or
309+// not), using:
310+//
311+// stbi_is_hdr(char *filename);
312+//
313+// ===========================================================================
314+//
315+// iPhone PNG support:
316+//
317+// We optionally support converting iPhone-formatted PNGs (which store
318+// premultiplied BGRA) back to RGB, even though they're internally encoded
319+// differently. To enable this conversion, call
320+// stbi_convert_iphone_png_to_rgb(1).
321+//
322+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
323+// pixel to remove any premultiplied alpha *only* if the image file explicitly
324+// says there's premultiplied data (currently only happens in iPhone images,
325+// and only if iPhone convert-to-rgb processing is on).
326+//
327+// ===========================================================================
328+//
329+// ADDITIONAL CONFIGURATION
330+//
331+// - You can suppress implementation of any of the decoders to reduce
332+// your code footprint by #defining one or more of the following
333+// symbols before creating the implementation.
334+//
335+// STBI_NO_JPEG
336+// STBI_NO_PNG
337+// STBI_NO_BMP
338+// STBI_NO_PSD
339+// STBI_NO_TGA
340+// STBI_NO_GIF
341+// STBI_NO_HDR
342+// STBI_NO_PIC
343+// STBI_NO_PNM (.ppm and .pgm)
344+//
345+// - You can request *only* certain decoders and suppress all other ones
346+// (this will be more forward-compatible, as addition of new decoders
347+// doesn't require you to disable them explicitly):
348+//
349+// STBI_ONLY_JPEG
350+// STBI_ONLY_PNG
351+// STBI_ONLY_BMP
352+// STBI_ONLY_PSD
353+// STBI_ONLY_TGA
354+// STBI_ONLY_GIF
355+// STBI_ONLY_HDR
356+// STBI_ONLY_PIC
357+// STBI_ONLY_PNM (.ppm and .pgm)
358+//
359+// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
360+// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
361+//
362+// - If you define STBI_MAX_DIMENSIONS, stb_image will reject images greater
363+// than that size (in either width or height) without further processing.
364+// This is to let programs in the wild set an upper bound to prevent
365+// denial-of-service attacks on untrusted data, as one could generate a
366+// valid image of gigantic dimensions and force stb_image to allocate a
367+// huge block of memory and spend disproportionate time decoding it. By
368+// default this is set to (1 << 24), which is 16777216, but that's still
369+// very big.
370+
371+#ifndef STBI_NO_STDIO
372+#include <stdio.h>
373+#endif // STBI_NO_STDIO
374+
375+#define STBI_VERSION 1
376+
377+enum
378+{
379+ STBI_default = 0, // only used for desired_channels
380+
381+ STBI_grey = 1,
382+ STBI_grey_alpha = 2,
383+ STBI_rgb = 3,
384+ STBI_rgb_alpha = 4
385+};
386+
387+#include <stdlib.h>
388+typedef unsigned char stbi_uc;
389+typedef unsigned short stbi_us;
390+
391+#ifdef __cplusplus
392+extern "C" {
393+#endif
394+
395+#ifndef STBIDEF
396+#ifdef STB_IMAGE_STATIC
397+#define STBIDEF static
398+#else
399+#define STBIDEF extern
400+#endif
401+#endif
402+
403+//////////////////////////////////////////////////////////////////////////////
404+//
405+// PRIMARY API - works on images of any type
406+//
407+
408+//
409+// load image by filename, open file, or memory buffer
410+//
411+
412+typedef struct
413+{
414+ int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read
415+ void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
416+ int (*eof) (void *user); // returns nonzero if we are at end of file/data
417+} stbi_io_callbacks;
418+
419+////////////////////////////////////
420+//
421+// 8-bits-per-channel interface
422+//
423+
424+STBIDEF stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *channels_in_file, int desired_channels);
425+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *channels_in_file, int desired_channels);
426+
427+#ifndef STBI_NO_STDIO
428+STBIDEF stbi_uc *stbi_load (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
429+STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
430+// for stbi_load_from_file, file pointer is left pointing immediately after image
431+#endif
432+
433+#ifndef STBI_NO_GIF
434+STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp);
435+#endif
436+
437+#ifdef STBI_WINDOWS_UTF8
438+STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input);
439+#endif
440+
441+////////////////////////////////////
442+//
443+// 16-bits-per-channel interface
444+//
445+
446+STBIDEF stbi_us *stbi_load_16_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
447+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
448+
449+#ifndef STBI_NO_STDIO
450+STBIDEF stbi_us *stbi_load_16 (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
451+STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
452+#endif
453+
454+////////////////////////////////////
455+//
456+// float-per-channel interface
457+//
458+#ifndef STBI_NO_LINEAR
459+ STBIDEF float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
460+ STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
461+
462+ #ifndef STBI_NO_STDIO
463+ STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
464+ STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
465+ #endif
466+#endif
467+
468+#ifndef STBI_NO_HDR
469+ STBIDEF void stbi_hdr_to_ldr_gamma(float gamma);
470+ STBIDEF void stbi_hdr_to_ldr_scale(float scale);
471+#endif // STBI_NO_HDR
472+
473+#ifndef STBI_NO_LINEAR
474+ STBIDEF void stbi_ldr_to_hdr_gamma(float gamma);
475+ STBIDEF void stbi_ldr_to_hdr_scale(float scale);
476+#endif // STBI_NO_LINEAR
477+
478+// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
479+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
480+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
481+#ifndef STBI_NO_STDIO
482+STBIDEF int stbi_is_hdr (char const *filename);
483+STBIDEF int stbi_is_hdr_from_file(FILE *f);
484+#endif // STBI_NO_STDIO
485+
486+
487+// get a VERY brief reason for failure
488+// on most compilers (and ALL modern mainstream compilers) this is threadsafe
489+STBIDEF const char *stbi_failure_reason (void);
490+
491+// free the loaded image -- this is just free()
492+STBIDEF void stbi_image_free (void *retval_from_stbi_load);
493+
494+// get image dimensions & components without fully decoding
495+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
496+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
497+STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len);
498+STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *clbk, void *user);
499+
500+#ifndef STBI_NO_STDIO
501+STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp);
502+STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp);
503+STBIDEF int stbi_is_16_bit (char const *filename);
504+STBIDEF int stbi_is_16_bit_from_file(FILE *f);
505+#endif
506+
507+
508+
509+// for image formats that explicitly notate that they have premultiplied alpha,
510+// we just return the colors as stored in the file. set this flag to force
511+// unpremultiplication. results are undefined if the unpremultiply overflow.
512+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
513+
514+// indicate whether we should process iphone images back to canonical format,
515+// or just pass them through "as-is"
516+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
517+
518+// flip the image vertically, so the first pixel in the output array is the bottom left
519+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
520+
521+// as above, but only applies to images loaded on the thread that calls the function
522+// this function is only available if your compiler supports thread-local variables;
523+// calling it will fail to link if your compiler doesn't
524+STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply);
525+STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert);
526+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip);
527+
528+// ZLIB client - used by PNG, available for other purposes
529+
530+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
531+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
532+STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
533+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
534+
535+STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
536+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
537+
538+
539+#ifdef __cplusplus
540+}
541+#endif
542+
543+//
544+//
545+//// end header file /////////////////////////////////////////////////////
546+#endif // STBI_INCLUDE_STB_IMAGE_H
547+
548+#ifdef STB_IMAGE_IMPLEMENTATION
549+
550+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \
551+ || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \
552+ || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \
553+ || defined(STBI_ONLY_ZLIB)
554+ #ifndef STBI_ONLY_JPEG
555+ #define STBI_NO_JPEG
556+ #endif
557+ #ifndef STBI_ONLY_PNG
558+ #define STBI_NO_PNG
559+ #endif
560+ #ifndef STBI_ONLY_BMP
561+ #define STBI_NO_BMP
562+ #endif
563+ #ifndef STBI_ONLY_PSD
564+ #define STBI_NO_PSD
565+ #endif
566+ #ifndef STBI_ONLY_TGA
567+ #define STBI_NO_TGA
568+ #endif
569+ #ifndef STBI_ONLY_GIF
570+ #define STBI_NO_GIF
571+ #endif
572+ #ifndef STBI_ONLY_HDR
573+ #define STBI_NO_HDR
574+ #endif
575+ #ifndef STBI_ONLY_PIC
576+ #define STBI_NO_PIC
577+ #endif
578+ #ifndef STBI_ONLY_PNM
579+ #define STBI_NO_PNM
580+ #endif
581+#endif
582+
583+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
584+#define STBI_NO_ZLIB
585+#endif
586+
587+
588+#include <stdarg.h>
589+#include <stddef.h> // ptrdiff_t on osx
590+#include <stdlib.h>
591+#include <string.h>
592+#include <limits.h>
593+
594+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
595+#include <math.h> // ldexp, pow
596+#endif
597+
598+#ifndef STBI_NO_STDIO
599+#include <stdio.h>
600+#endif
601+
602+#ifndef STBI_ASSERT
603+#include <assert.h>
604+#define STBI_ASSERT(x) assert(x)
605+#endif
606+
607+#ifdef __cplusplus
608+#define STBI_EXTERN extern "C"
609+#else
610+#define STBI_EXTERN extern
611+#endif
612+
613+
614+#ifndef _MSC_VER
615+ #ifdef __cplusplus
616+ #define stbi_inline inline
617+ #else
618+ #define stbi_inline
619+ #endif
620+#else
621+ #define stbi_inline __forceinline
622+#endif
623+
624+#ifndef STBI_NO_THREAD_LOCALS
625+ #if defined(__cplusplus) && __cplusplus >= 201103L
626+ #define STBI_THREAD_LOCAL thread_local
627+ #elif defined(__GNUC__) && __GNUC__ < 5
628+ #define STBI_THREAD_LOCAL __thread
629+ #elif defined(_MSC_VER)
630+ #define STBI_THREAD_LOCAL __declspec(thread)
631+ #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__)
632+ #define STBI_THREAD_LOCAL _Thread_local
633+ #endif
634+
635+ #ifndef STBI_THREAD_LOCAL
636+ #if defined(__GNUC__)
637+ #define STBI_THREAD_LOCAL __thread
638+ #endif
639+ #endif
640+#endif
641+
642+#if defined(_MSC_VER) || defined(__SYMBIAN32__)
643+typedef unsigned short stbi__uint16;
644+typedef signed short stbi__int16;
645+typedef unsigned int stbi__uint32;
646+typedef signed int stbi__int32;
647+#else
648+#include <stdint.h>
649+typedef uint16_t stbi__uint16;
650+typedef int16_t stbi__int16;
651+typedef uint32_t stbi__uint32;
652+typedef int32_t stbi__int32;
653+#endif
654+
655+// should produce compiler error if size is wrong
656+typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
657+
658+#ifdef _MSC_VER
659+#define STBI_NOTUSED(v) (void)(v)
660+#else
661+#define STBI_NOTUSED(v) (void)sizeof(v)
662+#endif
663+
664+#ifdef _MSC_VER
665+#define STBI_HAS_LROTL
666+#endif
667+
668+#ifdef STBI_HAS_LROTL
669+ #define stbi_lrot(x,y) _lrotl(x,y)
670+#else
671+ #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (-(y) & 31)))
672+#endif
673+
674+#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
675+// ok
676+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
677+// ok
678+#else
679+#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
680+#endif
681+
682+#ifndef STBI_MALLOC
683+#define STBI_MALLOC(sz) malloc(sz)
684+#define STBI_REALLOC(p,newsz) realloc(p,newsz)
685+#define STBI_FREE(p) free(p)
686+#endif
687+
688+#ifndef STBI_REALLOC_SIZED
689+#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz)
690+#endif
691+
692+// x86/x64 detection
693+#if defined(__x86_64__) || defined(_M_X64)
694+#define STBI__X64_TARGET
695+#elif defined(__i386) || defined(_M_IX86)
696+#define STBI__X86_TARGET
697+#endif
698+
699+#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
700+// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
701+// which in turn means it gets to use SSE2 everywhere. This is unfortunate,
702+// but previous attempts to provide the SSE2 functions with runtime
703+// detection caused numerous issues. The way architecture extensions are
704+// exposed in GCC/Clang is, sadly, not really suited for one-file libs.
705+// New behavior: if compiled with -msse2, we use SSE2 without any
706+// detection; if not, we don't use it at all.
707+#define STBI_NO_SIMD
708+#endif
709+
710+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
711+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET
712+//
713+// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
714+// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
715+// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
716+// simultaneously enabling "-mstackrealign".
717+//
718+// See https://github.com/nothings/stb/issues/81 for more information.
719+//
720+// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
721+// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2.
722+#define STBI_NO_SIMD
723+#endif
724+
725+#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET))
726+#define STBI_SSE2
727+#include <emmintrin.h>
728+
729+#ifdef _MSC_VER
730+
731+#if _MSC_VER >= 1400 // not VC6
732+#include <intrin.h> // __cpuid
733+static int stbi__cpuid3(void)
734+{
735+ int info[4];
736+ __cpuid(info,1);
737+ return info[3];
738+}
739+#else
740+static int stbi__cpuid3(void)
741+{
742+ int res;
743+ __asm {
744+ mov eax,1
745+ cpuid
746+ mov res,edx
747+ }
748+ return res;
749+}
750+#endif
751+
752+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
753+
754+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
755+static int stbi__sse2_available(void)
756+{
757+ int info3 = stbi__cpuid3();
758+ return ((info3 >> 26) & 1) != 0;
759+}
760+#endif
761+
762+#else // assume GCC-style if not VC++
763+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
764+
765+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
766+static int stbi__sse2_available(void)
767+{
768+ // If we're even attempting to compile this on GCC/Clang, that means
769+ // -msse2 is on, which means the compiler is allowed to use SSE2
770+ // instructions at will, and so are we.
771+ return 1;
772+}
773+#endif
774+
775+#endif
776+#endif
777+
778+// ARM NEON
779+#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
780+#undef STBI_NEON
781+#endif
782+
783+#ifdef STBI_NEON
784+#include <arm_neon.h>
785+#ifdef _MSC_VER
786+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
787+#else
788+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
789+#endif
790+#endif
791+
792+#ifndef STBI_SIMD_ALIGN
793+#define STBI_SIMD_ALIGN(type, name) type name
794+#endif
795+
796+#ifndef STBI_MAX_DIMENSIONS
797+#define STBI_MAX_DIMENSIONS (1 << 24)
798+#endif
799+
800+///////////////////////////////////////////////
801+//
802+// stbi__context struct and start_xxx functions
803+
804+// stbi__context structure is our basic context used by all images, so it
805+// contains all the IO context, plus some basic image information
806+typedef struct
807+{
808+ stbi__uint32 img_x, img_y;
809+ int img_n, img_out_n;
810+
811+ stbi_io_callbacks io;
812+ void *io_user_data;
813+
814+ int read_from_callbacks;
815+ int buflen;
816+ stbi_uc buffer_start[128];
817+ int callback_already_read;
818+
819+ stbi_uc *img_buffer, *img_buffer_end;
820+ stbi_uc *img_buffer_original, *img_buffer_original_end;
821+} stbi__context;
822+
823+
824+static void stbi__refill_buffer(stbi__context *s);
825+
826+// initialize a memory-decode context
827+static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len)
828+{
829+ s->io.read = NULL;
830+ s->read_from_callbacks = 0;
831+ s->callback_already_read = 0;
832+ s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer;
833+ s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len;
834+}
835+
836+// initialize a callback-based context
837+static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user)
838+{
839+ s->io = *c;
840+ s->io_user_data = user;
841+ s->buflen = sizeof(s->buffer_start);
842+ s->read_from_callbacks = 1;
843+ s->callback_already_read = 0;
844+ s->img_buffer = s->img_buffer_original = s->buffer_start;
845+ stbi__refill_buffer(s);
846+ s->img_buffer_original_end = s->img_buffer_end;
847+}
848+
849+#ifndef STBI_NO_STDIO
850+
851+static int stbi__stdio_read(void *user, char *data, int size)
852+{
853+ return (int) fread(data,1,size,(FILE*) user);
854+}
855+
856+static void stbi__stdio_skip(void *user, int n)
857+{
858+ int ch;
859+ fseek((FILE*) user, n, SEEK_CUR);
860+ ch = fgetc((FILE*) user); /* have to read a byte to reset feof()'s flag */
861+ if (ch != EOF) {
862+ ungetc(ch, (FILE *) user); /* push byte back onto stream if valid. */
863+ }
864+}
865+
866+static int stbi__stdio_eof(void *user)
867+{
868+ return feof((FILE*) user) || ferror((FILE *) user);
869+}
870+
871+static stbi_io_callbacks stbi__stdio_callbacks =
872+{
873+ stbi__stdio_read,
874+ stbi__stdio_skip,
875+ stbi__stdio_eof,
876+};
877+
878+static void stbi__start_file(stbi__context *s, FILE *f)
879+{
880+ stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f);
881+}
882+
883+//static void stop_file(stbi__context *s) { }
884+
885+#endif // !STBI_NO_STDIO
886+
887+static void stbi__rewind(stbi__context *s)
888+{
889+ // conceptually rewind SHOULD rewind to the beginning of the stream,
890+ // but we just rewind to the beginning of the initial buffer, because
891+ // we only use it after doing 'test', which only ever looks at at most 92 bytes
892+ s->img_buffer = s->img_buffer_original;
893+ s->img_buffer_end = s->img_buffer_original_end;
894+}
895+
896+enum
897+{
898+ STBI_ORDER_RGB,
899+ STBI_ORDER_BGR
900+};
901+
902+typedef struct
903+{
904+ int bits_per_channel;
905+ int num_channels;
906+ int channel_order;
907+} stbi__result_info;
908+
909+#ifndef STBI_NO_JPEG
910+static int stbi__jpeg_test(stbi__context *s);
911+static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
912+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
913+#endif
914+
915+#ifndef STBI_NO_PNG
916+static int stbi__png_test(stbi__context *s);
917+static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
918+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
919+static int stbi__png_is16(stbi__context *s);
920+#endif
921+
922+#ifndef STBI_NO_BMP
923+static int stbi__bmp_test(stbi__context *s);
924+static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
925+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
926+#endif
927+
928+#ifndef STBI_NO_TGA
929+static int stbi__tga_test(stbi__context *s);
930+static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
931+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
932+#endif
933+
934+#ifndef STBI_NO_PSD
935+static int stbi__psd_test(stbi__context *s);
936+static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc);
937+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
938+static int stbi__psd_is16(stbi__context *s);
939+#endif
940+
941+#ifndef STBI_NO_HDR
942+static int stbi__hdr_test(stbi__context *s);
943+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
944+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
945+#endif
946+
947+#ifndef STBI_NO_PIC
948+static int stbi__pic_test(stbi__context *s);
949+static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
950+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
951+#endif
952+
953+#ifndef STBI_NO_GIF
954+static int stbi__gif_test(stbi__context *s);
955+static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
956+static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp);
957+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
958+#endif
959+
960+#ifndef STBI_NO_PNM
961+static int stbi__pnm_test(stbi__context *s);
962+static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
963+static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
964+static int stbi__pnm_is16(stbi__context *s);
965+#endif
966+
967+static
968+#ifdef STBI_THREAD_LOCAL
969+STBI_THREAD_LOCAL
970+#endif
971+const char *stbi__g_failure_reason;
972+
973+STBIDEF const char *stbi_failure_reason(void)
974+{
975+ return stbi__g_failure_reason;
976+}
977+
978+#ifndef STBI_NO_FAILURE_STRINGS
979+static int stbi__err(const char *str)
980+{
981+ stbi__g_failure_reason = str;
982+ return 0;
983+}
984+#endif
985+
986+static void *stbi__malloc(size_t size)
987+{
988+ return STBI_MALLOC(size);
989+}
990+
991+// stb_image uses ints pervasively, including for offset calculations.
992+// therefore the largest decoded image size we can support with the
993+// current code, even on 64-bit targets, is INT_MAX. this is not a
994+// significant limitation for the intended use case.
995+//
996+// we do, however, need to make sure our size calculations don't
997+// overflow. hence a few helper functions for size calculations that
998+// multiply integers together, making sure that they're non-negative
999+// and no overflow occurs.
1000+
1001+// return 1 if the sum is valid, 0 on overflow.
1002+// negative terms are considered invalid.
1003+static int stbi__addsizes_valid(int a, int b)
1004+{
1005+ if (b < 0) return 0;
1006+ // now 0 <= b <= INT_MAX, hence also
1007+ // 0 <= INT_MAX - b <= INTMAX.
1008+ // And "a + b <= INT_MAX" (which might overflow) is the
1009+ // same as a <= INT_MAX - b (no overflow)
1010+ return a <= INT_MAX - b;
1011+}
1012+
1013+// returns 1 if the product is valid, 0 on overflow.
1014+// negative factors are considered invalid.
1015+static int stbi__mul2sizes_valid(int a, int b)
1016+{
1017+ if (a < 0 || b < 0) return 0;
1018+ if (b == 0) return 1; // mul-by-0 is always safe
1019+ // portable way to check for no overflows in a*b
1020+ return a <= INT_MAX/b;
1021+}
1022+
1023+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR)
1024+// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow
1025+static int stbi__mad2sizes_valid(int a, int b, int add)
1026+{
1027+ return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add);
1028+}
1029+#endif
1030+
1031+// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow
1032+static int stbi__mad3sizes_valid(int a, int b, int c, int add)
1033+{
1034+ return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
1035+ stbi__addsizes_valid(a*b*c, add);
1036+}
1037+
1038+// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow
1039+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM)
1040+static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add)
1041+{
1042+ return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
1043+ stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add);
1044+}
1045+#endif
1046+
1047+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR)
1048+// mallocs with size overflow checking
1049+static void *stbi__malloc_mad2(int a, int b, int add)
1050+{
1051+ if (!stbi__mad2sizes_valid(a, b, add)) return NULL;
1052+ return stbi__malloc(a*b + add);
1053+}
1054+#endif
1055+
1056+static void *stbi__malloc_mad3(int a, int b, int c, int add)
1057+{
1058+ if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL;
1059+ return stbi__malloc(a*b*c + add);
1060+}
1061+
1062+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM)
1063+static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
1064+{
1065+ if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL;
1066+ return stbi__malloc(a*b*c*d + add);
1067+}
1068+#endif
1069+
1070+// returns 1 if the sum of two signed ints is valid (between -2^31 and 2^31-1 inclusive), 0 on overflow.
1071+static int stbi__addints_valid(int a, int b)
1072+{
1073+ if ((a >= 0) != (b >= 0)) return 1; // a and b have different signs, so no overflow
1074+ if (a < 0 && b < 0) return a >= INT_MIN - b; // same as a + b >= INT_MIN; INT_MIN - b cannot overflow since b < 0.
1075+ return a <= INT_MAX - b;
1076+}
1077+
1078+// returns 1 if the product of two ints fits in a signed short, 0 on overflow.
1079+static int stbi__mul2shorts_valid(int a, int b)
1080+{
1081+ if (b == 0 || b == -1) return 1; // multiplication by 0 is always 0; check for -1 so SHRT_MIN/b doesn't overflow
1082+ if ((a >= 0) == (b >= 0)) return a <= SHRT_MAX/b; // product is positive, so similar to mul2sizes_valid
1083+ if (b < 0) return a <= SHRT_MIN / b; // same as a * b >= SHRT_MIN
1084+ return a >= SHRT_MIN / b;
1085+}
1086+
1087+// stbi__err - error
1088+// stbi__errpf - error returning pointer to float
1089+// stbi__errpuc - error returning pointer to unsigned char
1090+
1091+#ifdef STBI_NO_FAILURE_STRINGS
1092+ #define stbi__err(x,y) 0
1093+#elif defined(STBI_FAILURE_USERMSG)
1094+ #define stbi__err(x,y) stbi__err(y)
1095+#else
1096+ #define stbi__err(x,y) stbi__err(x)
1097+#endif
1098+
1099+#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL))
1100+#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
1101+
1102+STBIDEF void stbi_image_free(void *retval_from_stbi_load)
1103+{
1104+ STBI_FREE(retval_from_stbi_load);
1105+}
1106+
1107+#ifndef STBI_NO_LINEAR
1108+static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
1109+#endif
1110+
1111+#ifndef STBI_NO_HDR
1112+static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp);
1113+#endif
1114+
1115+static int stbi__vertically_flip_on_load_global = 0;
1116+
1117+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
1118+{
1119+ stbi__vertically_flip_on_load_global = flag_true_if_should_flip;
1120+}
1121+
1122+#ifndef STBI_THREAD_LOCAL
1123+#define stbi__vertically_flip_on_load stbi__vertically_flip_on_load_global
1124+#else
1125+static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set;
1126+
1127+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip)
1128+{
1129+ stbi__vertically_flip_on_load_local = flag_true_if_should_flip;
1130+ stbi__vertically_flip_on_load_set = 1;
1131+}
1132+
1133+#define stbi__vertically_flip_on_load (stbi__vertically_flip_on_load_set \
1134+ ? stbi__vertically_flip_on_load_local \
1135+ : stbi__vertically_flip_on_load_global)
1136+#endif // STBI_THREAD_LOCAL
1137+
1138+static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
1139+{
1140+ memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields
1141+ ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed
1142+ ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order
1143+ ri->num_channels = 0;
1144+
1145+ // test the formats with a very explicit header first (at least a FOURCC
1146+ // or distinctive magic number first)
1147+ #ifndef STBI_NO_PNG
1148+ if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri);
1149+ #endif
1150+ #ifndef STBI_NO_BMP
1151+ if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp, ri);
1152+ #endif
1153+ #ifndef STBI_NO_GIF
1154+ if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp, ri);
1155+ #endif
1156+ #ifndef STBI_NO_PSD
1157+ if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc);
1158+ #else
1159+ STBI_NOTUSED(bpc);
1160+ #endif
1161+ #ifndef STBI_NO_PIC
1162+ if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp, ri);
1163+ #endif
1164+
1165+ // then the formats that can end up attempting to load with just 1 or 2
1166+ // bytes matching expectations; these are prone to false positives, so
1167+ // try them later
1168+ #ifndef STBI_NO_JPEG
1169+ if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri);
1170+ #endif
1171+ #ifndef STBI_NO_PNM
1172+ if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp, ri);
1173+ #endif
1174+
1175+ #ifndef STBI_NO_HDR
1176+ if (stbi__hdr_test(s)) {
1177+ float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri);
1178+ return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
1179+ }
1180+ #endif
1181+
1182+ #ifndef STBI_NO_TGA
1183+ // test tga last because it's a crappy test!
1184+ if (stbi__tga_test(s))
1185+ return stbi__tga_load(s,x,y,comp,req_comp, ri);
1186+ #endif
1187+
1188+ return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
1189+}
1190+
1191+static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels)
1192+{
1193+ int i;
1194+ int img_len = w * h * channels;
1195+ stbi_uc *reduced;
1196+
1197+ reduced = (stbi_uc *) stbi__malloc(img_len);
1198+ if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory");
1199+
1200+ for (i = 0; i < img_len; ++i)
1201+ reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling
1202+
1203+ STBI_FREE(orig);
1204+ return reduced;
1205+}
1206+
1207+static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels)
1208+{
1209+ int i;
1210+ int img_len = w * h * channels;
1211+ stbi__uint16 *enlarged;
1212+
1213+ enlarged = (stbi__uint16 *) stbi__malloc(img_len*2);
1214+ if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
1215+
1216+ for (i = 0; i < img_len; ++i)
1217+ enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff
1218+
1219+ STBI_FREE(orig);
1220+ return enlarged;
1221+}
1222+
1223+static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel)
1224+{
1225+ int row;
1226+ size_t bytes_per_row = (size_t)w * bytes_per_pixel;
1227+ stbi_uc temp[2048];
1228+ stbi_uc *bytes = (stbi_uc *)image;
1229+
1230+ for (row = 0; row < (h>>1); row++) {
1231+ stbi_uc *row0 = bytes + row*bytes_per_row;
1232+ stbi_uc *row1 = bytes + (h - row - 1)*bytes_per_row;
1233+ // swap row0 with row1
1234+ size_t bytes_left = bytes_per_row;
1235+ while (bytes_left) {
1236+ size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp);
1237+ memcpy(temp, row0, bytes_copy);
1238+ memcpy(row0, row1, bytes_copy);
1239+ memcpy(row1, temp, bytes_copy);
1240+ row0 += bytes_copy;
1241+ row1 += bytes_copy;
1242+ bytes_left -= bytes_copy;
1243+ }
1244+ }
1245+}
1246+
1247+#ifndef STBI_NO_GIF
1248+static void stbi__vertical_flip_slices(void *image, int w, int h, int z, int bytes_per_pixel)
1249+{
1250+ int slice;
1251+ int slice_size = w * h * bytes_per_pixel;
1252+
1253+ stbi_uc *bytes = (stbi_uc *)image;
1254+ for (slice = 0; slice < z; ++slice) {
1255+ stbi__vertical_flip(bytes, w, h, bytes_per_pixel);
1256+ bytes += slice_size;
1257+ }
1258+}
1259+#endif
1260+
1261+static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
1262+{
1263+ stbi__result_info ri;
1264+ void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8);
1265+
1266+ if (result == NULL)
1267+ return NULL;
1268+
1269+ // it is the responsibility of the loaders to make sure we get either 8 or 16 bit.
1270+ STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16);
1271+
1272+ if (ri.bits_per_channel != 8) {
1273+ result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
1274+ ri.bits_per_channel = 8;
1275+ }
1276+
1277+ // @TODO: move stbi__convert_format to here
1278+
1279+ if (stbi__vertically_flip_on_load) {
1280+ int channels = req_comp ? req_comp : *comp;
1281+ stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc));
1282+ }
1283+
1284+ return (unsigned char *) result;
1285+}
1286+
1287+static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
1288+{
1289+ stbi__result_info ri;
1290+ void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16);
1291+
1292+ if (result == NULL)
1293+ return NULL;
1294+
1295+ // it is the responsibility of the loaders to make sure we get either 8 or 16 bit.
1296+ STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16);
1297+
1298+ if (ri.bits_per_channel != 16) {
1299+ result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
1300+ ri.bits_per_channel = 16;
1301+ }
1302+
1303+ // @TODO: move stbi__convert_format16 to here
1304+ // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision
1305+
1306+ if (stbi__vertically_flip_on_load) {
1307+ int channels = req_comp ? req_comp : *comp;
1308+ stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16));
1309+ }
1310+
1311+ return (stbi__uint16 *) result;
1312+}
1313+
1314+#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR)
1315+static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp)
1316+{
1317+ if (stbi__vertically_flip_on_load && result != NULL) {
1318+ int channels = req_comp ? req_comp : *comp;
1319+ stbi__vertical_flip(result, *x, *y, channels * sizeof(float));
1320+ }
1321+}
1322+#endif
1323+
1324+#ifndef STBI_NO_STDIO
1325+
1326+#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8)
1327+STBI_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide);
1328+STBI_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default);
1329+#endif
1330+
1331+#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8)
1332+STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input)
1333+{
1334+ return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL);
1335+}
1336+#endif
1337+
1338+static FILE *stbi__fopen(char const *filename, char const *mode)
1339+{
1340+ FILE *f;
1341+#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8)
1342+ wchar_t wMode[64];
1343+ wchar_t wFilename[1024];
1344+ if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)/sizeof(*wFilename)))
1345+ return 0;
1346+
1347+ if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)/sizeof(*wMode)))
1348+ return 0;
1349+
1350+#if defined(_MSC_VER) && _MSC_VER >= 1400
1351+ if (0 != _wfopen_s(&f, wFilename, wMode))
1352+ f = 0;
1353+#else
1354+ f = _wfopen(wFilename, wMode);
1355+#endif
1356+
1357+#elif defined(_MSC_VER) && _MSC_VER >= 1400
1358+ if (0 != fopen_s(&f, filename, mode))
1359+ f=0;
1360+#else
1361+ f = fopen(filename, mode);
1362+#endif
1363+ return f;
1364+}
1365+
1366+
1367+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
1368+{
1369+ FILE *f = stbi__fopen(filename, "rb");
1370+ unsigned char *result;
1371+ if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
1372+ result = stbi_load_from_file(f,x,y,comp,req_comp);
1373+ fclose(f);
1374+ return result;
1375+}
1376+
1377+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
1378+{
1379+ unsigned char *result;
1380+ stbi__context s;
1381+ stbi__start_file(&s,f);
1382+ result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
1383+ if (result) {
1384+ // need to 'unget' all the characters in the IO buffer
1385+ fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
1386+ }
1387+ return result;
1388+}
1389+
1390+STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp)
1391+{
1392+ stbi__uint16 *result;
1393+ stbi__context s;
1394+ stbi__start_file(&s,f);
1395+ result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp);
1396+ if (result) {
1397+ // need to 'unget' all the characters in the IO buffer
1398+ fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
1399+ }
1400+ return result;
1401+}
1402+
1403+STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp)
1404+{
1405+ FILE *f = stbi__fopen(filename, "rb");
1406+ stbi__uint16 *result;
1407+ if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file");
1408+ result = stbi_load_from_file_16(f,x,y,comp,req_comp);
1409+ fclose(f);
1410+ return result;
1411+}
1412+
1413+
1414+#endif //!STBI_NO_STDIO
1415+
1416+STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels)
1417+{
1418+ stbi__context s;
1419+ stbi__start_mem(&s,buffer,len);
1420+ return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels);
1421+}
1422+
1423+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels)
1424+{
1425+ stbi__context s;
1426+ stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
1427+ return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels);
1428+}
1429+
1430+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
1431+{
1432+ stbi__context s;
1433+ stbi__start_mem(&s,buffer,len);
1434+ return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
1435+}
1436+
1437+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
1438+{
1439+ stbi__context s;
1440+ stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
1441+ return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
1442+}
1443+
1444+#ifndef STBI_NO_GIF
1445+STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp)
1446+{
1447+ unsigned char *result;
1448+ stbi__context s;
1449+ stbi__start_mem(&s,buffer,len);
1450+
1451+ result = (unsigned char*) stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp);
1452+ if (stbi__vertically_flip_on_load) {
1453+ stbi__vertical_flip_slices( result, *x, *y, *z, *comp );
1454+ }
1455+
1456+ return result;
1457+}
1458+#endif
1459+
1460+#ifndef STBI_NO_LINEAR
1461+static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
1462+{
1463+ unsigned char *data;
1464+ #ifndef STBI_NO_HDR
1465+ if (stbi__hdr_test(s)) {
1466+ stbi__result_info ri;
1467+ float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri);
1468+ if (hdr_data)
1469+ stbi__float_postprocess(hdr_data,x,y,comp,req_comp);
1470+ return hdr_data;
1471+ }
1472+ #endif
1473+ data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp);
1474+ if (data)
1475+ return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
1476+ return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
1477+}
1478+
1479+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
1480+{
1481+ stbi__context s;
1482+ stbi__start_mem(&s,buffer,len);
1483+ return stbi__loadf_main(&s,x,y,comp,req_comp);
1484+}
1485+
1486+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
1487+{
1488+ stbi__context s;
1489+ stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
1490+ return stbi__loadf_main(&s,x,y,comp,req_comp);
1491+}
1492+
1493+#ifndef STBI_NO_STDIO
1494+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
1495+{
1496+ float *result;
1497+ FILE *f = stbi__fopen(filename, "rb");
1498+ if (!f) return stbi__errpf("can't fopen", "Unable to open file");
1499+ result = stbi_loadf_from_file(f,x,y,comp,req_comp);
1500+ fclose(f);
1501+ return result;
1502+}
1503+
1504+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
1505+{
1506+ stbi__context s;
1507+ stbi__start_file(&s,f);
1508+ return stbi__loadf_main(&s,x,y,comp,req_comp);
1509+}
1510+#endif // !STBI_NO_STDIO
1511+
1512+#endif // !STBI_NO_LINEAR
1513+
1514+// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
1515+// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
1516+// reports false!
1517+
1518+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
1519+{
1520+ #ifndef STBI_NO_HDR
1521+ stbi__context s;
1522+ stbi__start_mem(&s,buffer,len);
1523+ return stbi__hdr_test(&s);
1524+ #else
1525+ STBI_NOTUSED(buffer);
1526+ STBI_NOTUSED(len);
1527+ return 0;
1528+ #endif
1529+}
1530+
1531+#ifndef STBI_NO_STDIO
1532+STBIDEF int stbi_is_hdr (char const *filename)
1533+{
1534+ FILE *f = stbi__fopen(filename, "rb");
1535+ int result=0;
1536+ if (f) {
1537+ result = stbi_is_hdr_from_file(f);
1538+ fclose(f);
1539+ }
1540+ return result;
1541+}
1542+
1543+STBIDEF int stbi_is_hdr_from_file(FILE *f)
1544+{
1545+ #ifndef STBI_NO_HDR
1546+ long pos = ftell(f);
1547+ int res;
1548+ stbi__context s;
1549+ stbi__start_file(&s,f);
1550+ res = stbi__hdr_test(&s);
1551+ fseek(f, pos, SEEK_SET);
1552+ return res;
1553+ #else
1554+ STBI_NOTUSED(f);
1555+ return 0;
1556+ #endif
1557+}
1558+#endif // !STBI_NO_STDIO
1559+
1560+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
1561+{
1562+ #ifndef STBI_NO_HDR
1563+ stbi__context s;
1564+ stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
1565+ return stbi__hdr_test(&s);
1566+ #else
1567+ STBI_NOTUSED(clbk);
1568+ STBI_NOTUSED(user);
1569+ return 0;
1570+ #endif
1571+}
1572+
1573+#ifndef STBI_NO_LINEAR
1574+static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
1575+
1576+STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
1577+STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
1578+#endif
1579+
1580+static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
1581+
1582+STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
1583+STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
1584+
1585+
1586+//////////////////////////////////////////////////////////////////////////////
1587+//
1588+// Common code used by all image loaders
1589+//
1590+
1591+enum
1592+{
1593+ STBI__SCAN_load=0,
1594+ STBI__SCAN_type,
1595+ STBI__SCAN_header
1596+};
1597+
1598+static void stbi__refill_buffer(stbi__context *s)
1599+{
1600+ int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
1601+ s->callback_already_read += (int) (s->img_buffer - s->img_buffer_original);
1602+ if (n == 0) {
1603+ // at end of file, treat same as if from memory, but need to handle case
1604+ // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
1605+ s->read_from_callbacks = 0;
1606+ s->img_buffer = s->buffer_start;
1607+ s->img_buffer_end = s->buffer_start+1;
1608+ *s->img_buffer = 0;
1609+ } else {
1610+ s->img_buffer = s->buffer_start;
1611+ s->img_buffer_end = s->buffer_start + n;
1612+ }
1613+}
1614+
1615+stbi_inline static stbi_uc stbi__get8(stbi__context *s)
1616+{
1617+ if (s->img_buffer < s->img_buffer_end)
1618+ return *s->img_buffer++;
1619+ if (s->read_from_callbacks) {
1620+ stbi__refill_buffer(s);
1621+ return *s->img_buffer++;
1622+ }
1623+ return 0;
1624+}
1625+
1626+#if defined(STBI_NO_JPEG) && defined(STBI_NO_HDR) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
1627+// nothing
1628+#else
1629+stbi_inline static int stbi__at_eof(stbi__context *s)
1630+{
1631+ if (s->io.read) {
1632+ if (!(s->io.eof)(s->io_user_data)) return 0;
1633+ // if feof() is true, check if buffer = end
1634+ // special case: we've only got the special 0 character at the end
1635+ if (s->read_from_callbacks == 0) return 1;
1636+ }
1637+
1638+ return s->img_buffer >= s->img_buffer_end;
1639+}
1640+#endif
1641+
1642+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC)
1643+// nothing
1644+#else
1645+static void stbi__skip(stbi__context *s, int n)
1646+{
1647+ if (n == 0) return; // already there!
1648+ if (n < 0) {
1649+ s->img_buffer = s->img_buffer_end;
1650+ return;
1651+ }
1652+ if (s->io.read) {
1653+ int blen = (int) (s->img_buffer_end - s->img_buffer);
1654+ if (blen < n) {
1655+ s->img_buffer = s->img_buffer_end;
1656+ (s->io.skip)(s->io_user_data, n - blen);
1657+ return;
1658+ }
1659+ }
1660+ s->img_buffer += n;
1661+}
1662+#endif
1663+
1664+#if defined(STBI_NO_PNG) && defined(STBI_NO_TGA) && defined(STBI_NO_HDR) && defined(STBI_NO_PNM)
1665+// nothing
1666+#else
1667+static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
1668+{
1669+ if (s->io.read) {
1670+ int blen = (int) (s->img_buffer_end - s->img_buffer);
1671+ if (blen < n) {
1672+ int res, count;
1673+
1674+ memcpy(buffer, s->img_buffer, blen);
1675+
1676+ count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
1677+ res = (count == (n-blen));
1678+ s->img_buffer = s->img_buffer_end;
1679+ return res;
1680+ }
1681+ }
1682+
1683+ if (s->img_buffer+n <= s->img_buffer_end) {
1684+ memcpy(buffer, s->img_buffer, n);
1685+ s->img_buffer += n;
1686+ return 1;
1687+ } else
1688+ return 0;
1689+}
1690+#endif
1691+
1692+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
1693+// nothing
1694+#else
1695+static int stbi__get16be(stbi__context *s)
1696+{
1697+ int z = stbi__get8(s);
1698+ return (z << 8) + stbi__get8(s);
1699+}
1700+#endif
1701+
1702+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
1703+// nothing
1704+#else
1705+static stbi__uint32 stbi__get32be(stbi__context *s)
1706+{
1707+ stbi__uint32 z = stbi__get16be(s);
1708+ return (z << 16) + stbi__get16be(s);
1709+}
1710+#endif
1711+
1712+#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
1713+// nothing
1714+#else
1715+static int stbi__get16le(stbi__context *s)
1716+{
1717+ int z = stbi__get8(s);
1718+ return z + (stbi__get8(s) << 8);
1719+}
1720+#endif
1721+
1722+#ifndef STBI_NO_BMP
1723+static stbi__uint32 stbi__get32le(stbi__context *s)
1724+{
1725+ stbi__uint32 z = stbi__get16le(s);
1726+ z += (stbi__uint32)stbi__get16le(s) << 16;
1727+ return z;
1728+}
1729+#endif
1730+
1731+#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings
1732+
1733+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
1734+// nothing
1735+#else
1736+//////////////////////////////////////////////////////////////////////////////
1737+//
1738+// generic converter from built-in img_n to req_comp
1739+// individual types do this automatically as much as possible (e.g. jpeg
1740+// does all cases internally since it needs to colorspace convert anyway,
1741+// and it never has alpha, so very few cases ). png can automatically
1742+// interleave an alpha=255 channel, but falls back to this for other cases
1743+//
1744+// assume data buffer is malloced, so malloc a new one and free that one
1745+// only failure mode is malloc failing
1746+
1747+static stbi_uc stbi__compute_y(int r, int g, int b)
1748+{
1749+ return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8);
1750+}
1751+#endif
1752+
1753+#if defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
1754+// nothing
1755+#else
1756+static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y)
1757+{
1758+ int i,j;
1759+ unsigned char *good;
1760+
1761+ if (req_comp == img_n) return data;
1762+ STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
1763+
1764+ good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0);
1765+ if (good == NULL) {
1766+ STBI_FREE(data);
1767+ return stbi__errpuc("outofmem", "Out of memory");
1768+ }
1769+
1770+ for (j=0; j < (int) y; ++j) {
1771+ unsigned char *src = data + j * x * img_n ;
1772+ unsigned char *dest = good + j * x * req_comp;
1773+
1774+ #define STBI__COMBO(a,b) ((a)*8+(b))
1775+ #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
1776+ // convert source image with img_n components to one with req_comp components;
1777+ // avoid switch per pixel, so use switch per scanline and massive macros
1778+ switch (STBI__COMBO(img_n, req_comp)) {
1779+ STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=255; } break;
1780+ STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
1781+ STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=255; } break;
1782+ STBI__CASE(2,1) { dest[0]=src[0]; } break;
1783+ STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
1784+ STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1]; } break;
1785+ STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=255; } break;
1786+ STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break;
1787+ STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = 255; } break;
1788+ STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break;
1789+ STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = src[3]; } break;
1790+ STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2]; } break;
1791+ default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return stbi__errpuc("unsupported", "Unsupported format conversion");
1792+ }
1793+ #undef STBI__CASE
1794+ }
1795+
1796+ STBI_FREE(data);
1797+ return good;
1798+}
1799+#endif
1800+
1801+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
1802+// nothing
1803+#else
1804+static stbi__uint16 stbi__compute_y_16(int r, int g, int b)
1805+{
1806+ return (stbi__uint16) (((r*77) + (g*150) + (29*b)) >> 8);
1807+}
1808+#endif
1809+
1810+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
1811+// nothing
1812+#else
1813+static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y)
1814+{
1815+ int i,j;
1816+ stbi__uint16 *good;
1817+
1818+ if (req_comp == img_n) return data;
1819+ STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
1820+
1821+ good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2);
1822+ if (good == NULL) {
1823+ STBI_FREE(data);
1824+ return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
1825+ }
1826+
1827+ for (j=0; j < (int) y; ++j) {
1828+ stbi__uint16 *src = data + j * x * img_n ;
1829+ stbi__uint16 *dest = good + j * x * req_comp;
1830+
1831+ #define STBI__COMBO(a,b) ((a)*8+(b))
1832+ #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
1833+ // convert source image with img_n components to one with req_comp components;
1834+ // avoid switch per pixel, so use switch per scanline and massive macros
1835+ switch (STBI__COMBO(img_n, req_comp)) {
1836+ STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=0xffff; } break;
1837+ STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
1838+ STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=0xffff; } break;
1839+ STBI__CASE(2,1) { dest[0]=src[0]; } break;
1840+ STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
1841+ STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1]; } break;
1842+ STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=0xffff; } break;
1843+ STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break;
1844+ STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = 0xffff; } break;
1845+ STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break;
1846+ STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = src[3]; } break;
1847+ STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2]; } break;
1848+ default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return (stbi__uint16*) stbi__errpuc("unsupported", "Unsupported format conversion");
1849+ }
1850+ #undef STBI__CASE
1851+ }
1852+
1853+ STBI_FREE(data);
1854+ return good;
1855+}
1856+#endif
1857+
1858+#ifndef STBI_NO_LINEAR
1859+static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
1860+{
1861+ int i,k,n;
1862+ float *output;
1863+ if (!data) return NULL;
1864+ output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0);
1865+ if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); }
1866+ // compute number of non-alpha components
1867+ if (comp & 1) n = comp; else n = comp-1;
1868+ for (i=0; i < x*y; ++i) {
1869+ for (k=0; k < n; ++k) {
1870+ output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
1871+ }
1872+ }
1873+ if (n < comp) {
1874+ for (i=0; i < x*y; ++i) {
1875+ output[i*comp + n] = data[i*comp + n]/255.0f;
1876+ }
1877+ }
1878+ STBI_FREE(data);
1879+ return output;
1880+}
1881+#endif
1882+
1883+#ifndef STBI_NO_HDR
1884+#define stbi__float2int(x) ((int) (x))
1885+static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp)
1886+{
1887+ int i,k,n;
1888+ stbi_uc *output;
1889+ if (!data) return NULL;
1890+ output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0);
1891+ if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); }
1892+ // compute number of non-alpha components
1893+ if (comp & 1) n = comp; else n = comp-1;
1894+ for (i=0; i < x*y; ++i) {
1895+ for (k=0; k < n; ++k) {
1896+ float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
1897+ if (z < 0) z = 0;
1898+ if (z > 255) z = 255;
1899+ output[i*comp + k] = (stbi_uc) stbi__float2int(z);
1900+ }
1901+ if (k < comp) {
1902+ float z = data[i*comp+k] * 255 + 0.5f;
1903+ if (z < 0) z = 0;
1904+ if (z > 255) z = 255;
1905+ output[i*comp + k] = (stbi_uc) stbi__float2int(z);
1906+ }
1907+ }
1908+ STBI_FREE(data);
1909+ return output;
1910+}
1911+#endif
1912+
1913+//////////////////////////////////////////////////////////////////////////////
1914+//
1915+// "baseline" JPEG/JFIF decoder
1916+//
1917+// simple implementation
1918+// - doesn't support delayed output of y-dimension
1919+// - simple interface (only one output format: 8-bit interleaved RGB)
1920+// - doesn't try to recover corrupt jpegs
1921+// - doesn't allow partial loading, loading multiple at once
1922+// - still fast on x86 (copying globals into locals doesn't help x86)
1923+// - allocates lots of intermediate memory (full size of all components)
1924+// - non-interleaved case requires this anyway
1925+// - allows good upsampling (see next)
1926+// high-quality
1927+// - upsampled channels are bilinearly interpolated, even across blocks
1928+// - quality integer IDCT derived from IJG's 'slow'
1929+// performance
1930+// - fast huffman; reasonable integer IDCT
1931+// - some SIMD kernels for common paths on targets with SSE2/NEON
1932+// - uses a lot of intermediate memory, could cache poorly
1933+
1934+#ifndef STBI_NO_JPEG
1935+
1936+// huffman decoding acceleration
1937+#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
1938+
1939+typedef struct
1940+{
1941+ stbi_uc fast[1 << FAST_BITS];
1942+ // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
1943+ stbi__uint16 code[256];
1944+ stbi_uc values[256];
1945+ stbi_uc size[257];
1946+ unsigned int maxcode[18];
1947+ int delta[17]; // old 'firstsymbol' - old 'firstcode'
1948+} stbi__huffman;
1949+
1950+typedef struct
1951+{
1952+ stbi__context *s;
1953+ stbi__huffman huff_dc[4];
1954+ stbi__huffman huff_ac[4];
1955+ stbi__uint16 dequant[4][64];
1956+ stbi__int16 fast_ac[4][1 << FAST_BITS];
1957+
1958+// sizes for components, interleaved MCUs
1959+ int img_h_max, img_v_max;
1960+ int img_mcu_x, img_mcu_y;
1961+ int img_mcu_w, img_mcu_h;
1962+
1963+// definition of jpeg image component
1964+ struct
1965+ {
1966+ int id;
1967+ int h,v;
1968+ int tq;
1969+ int hd,ha;
1970+ int dc_pred;
1971+
1972+ int x,y,w2,h2;
1973+ stbi_uc *data;
1974+ void *raw_data, *raw_coeff;
1975+ stbi_uc *linebuf;
1976+ short *coeff; // progressive only
1977+ int coeff_w, coeff_h; // number of 8x8 coefficient blocks
1978+ } img_comp[4];
1979+
1980+ stbi__uint32 code_buffer; // jpeg entropy-coded buffer
1981+ int code_bits; // number of valid bits
1982+ unsigned char marker; // marker seen while filling entropy buffer
1983+ int nomore; // flag if we saw a marker so must stop
1984+
1985+ int progressive;
1986+ int spec_start;
1987+ int spec_end;
1988+ int succ_high;
1989+ int succ_low;
1990+ int eob_run;
1991+ int jfif;
1992+ int app14_color_transform; // Adobe APP14 tag
1993+ int rgb;
1994+
1995+ int scan_n, order[4];
1996+ int restart_interval, todo;
1997+
1998+// kernels
1999+ void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
2000+ void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step);
2001+ stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs);
2002+} stbi__jpeg;
2003+
2004+static int stbi__build_huffman(stbi__huffman *h, int *count)
2005+{
2006+ int i,j,k=0;
2007+ unsigned int code;
2008+ // build size list for each symbol (from JPEG spec)
2009+ for (i=0; i < 16; ++i) {
2010+ for (j=0; j < count[i]; ++j) {
2011+ h->size[k++] = (stbi_uc) (i+1);
2012+ if(k >= 257) return stbi__err("bad size list","Corrupt JPEG");
2013+ }
2014+ }
2015+ h->size[k] = 0;
2016+
2017+ // compute actual symbols (from jpeg spec)
2018+ code = 0;
2019+ k = 0;
2020+ for(j=1; j <= 16; ++j) {
2021+ // compute delta to add to code to compute symbol id
2022+ h->delta[j] = k - code;
2023+ if (h->size[k] == j) {
2024+ while (h->size[k] == j)
2025+ h->code[k++] = (stbi__uint16) (code++);
2026+ if (code-1 >= (1u << j)) return stbi__err("bad code lengths","Corrupt JPEG");
2027+ }
2028+ // compute largest code + 1 for this size, preshifted as needed later
2029+ h->maxcode[j] = code << (16-j);
2030+ code <<= 1;
2031+ }
2032+ h->maxcode[j] = 0xffffffff;
2033+
2034+ // build non-spec acceleration table; 255 is flag for not-accelerated
2035+ memset(h->fast, 255, 1 << FAST_BITS);
2036+ for (i=0; i < k; ++i) {
2037+ int s = h->size[i];
2038+ if (s <= FAST_BITS) {
2039+ int c = h->code[i] << (FAST_BITS-s);
2040+ int m = 1 << (FAST_BITS-s);
2041+ for (j=0; j < m; ++j) {
2042+ h->fast[c+j] = (stbi_uc) i;
2043+ }
2044+ }
2045+ }
2046+ return 1;
2047+}
2048+
2049+// build a table that decodes both magnitude and value of small ACs in
2050+// one go.
2051+static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
2052+{
2053+ int i;
2054+ for (i=0; i < (1 << FAST_BITS); ++i) {
2055+ stbi_uc fast = h->fast[i];
2056+ fast_ac[i] = 0;
2057+ if (fast < 255) {
2058+ int rs = h->values[fast];
2059+ int run = (rs >> 4) & 15;
2060+ int magbits = rs & 15;
2061+ int len = h->size[fast];
2062+
2063+ if (magbits && len + magbits <= FAST_BITS) {
2064+ // magnitude code followed by receive_extend code
2065+ int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
2066+ int m = 1 << (magbits - 1);
2067+ if (k < m) k += (~0U << magbits) + 1;
2068+ // if the result is small enough, we can fit it in fast_ac table
2069+ if (k >= -128 && k <= 127)
2070+ fast_ac[i] = (stbi__int16) ((k * 256) + (run * 16) + (len + magbits));
2071+ }
2072+ }
2073+ }
2074+}
2075+
2076+static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
2077+{
2078+ do {
2079+ unsigned int b = j->nomore ? 0 : stbi__get8(j->s);
2080+ if (b == 0xff) {
2081+ int c = stbi__get8(j->s);
2082+ while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes
2083+ if (c != 0) {
2084+ j->marker = (unsigned char) c;
2085+ j->nomore = 1;
2086+ return;
2087+ }
2088+ }
2089+ j->code_buffer |= b << (24 - j->code_bits);
2090+ j->code_bits += 8;
2091+ } while (j->code_bits <= 24);
2092+}
2093+
2094+// (1 << n) - 1
2095+static const stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
2096+
2097+// decode a jpeg huffman value from the bitstream
2098+stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
2099+{
2100+ unsigned int temp;
2101+ int c,k;
2102+
2103+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
2104+
2105+ // look at the top FAST_BITS and determine what symbol ID it is,
2106+ // if the code is <= FAST_BITS
2107+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
2108+ k = h->fast[c];
2109+ if (k < 255) {
2110+ int s = h->size[k];
2111+ if (s > j->code_bits)
2112+ return -1;
2113+ j->code_buffer <<= s;
2114+ j->code_bits -= s;
2115+ return h->values[k];
2116+ }
2117+
2118+ // naive test is to shift the code_buffer down so k bits are
2119+ // valid, then test against maxcode. To speed this up, we've
2120+ // preshifted maxcode left so that it has (16-k) 0s at the
2121+ // end; in other words, regardless of the number of bits, it
2122+ // wants to be compared against something shifted to have 16;
2123+ // that way we don't need to shift inside the loop.
2124+ temp = j->code_buffer >> 16;
2125+ for (k=FAST_BITS+1 ; ; ++k)
2126+ if (temp < h->maxcode[k])
2127+ break;
2128+ if (k == 17) {
2129+ // error! code not found
2130+ j->code_bits -= 16;
2131+ return -1;
2132+ }
2133+
2134+ if (k > j->code_bits)
2135+ return -1;
2136+
2137+ // convert the huffman code to the symbol id
2138+ c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
2139+ if(c < 0 || c >= 256) // symbol id out of bounds!
2140+ return -1;
2141+ STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
2142+
2143+ // convert the id to a symbol
2144+ j->code_bits -= k;
2145+ j->code_buffer <<= k;
2146+ return h->values[c];
2147+}
2148+
2149+// bias[n] = (-1<<n) + 1
2150+static const int stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767};
2151+
2152+// combined JPEG 'receive' and JPEG 'extend', since baseline
2153+// always extends everything it receives.
2154+stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
2155+{
2156+ unsigned int k;
2157+ int sgn;
2158+ if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
2159+ if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing
2160+
2161+ sgn = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear (positive), 1 if MSB set (negative)
2162+ k = stbi_lrot(j->code_buffer, n);
2163+ j->code_buffer = k & ~stbi__bmask[n];
2164+ k &= stbi__bmask[n];
2165+ j->code_bits -= n;
2166+ return k + (stbi__jbias[n] & (sgn - 1));
2167+}
2168+
2169+// get some unsigned bits
2170+stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
2171+{
2172+ unsigned int k;
2173+ if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
2174+ if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing
2175+ k = stbi_lrot(j->code_buffer, n);
2176+ j->code_buffer = k & ~stbi__bmask[n];
2177+ k &= stbi__bmask[n];
2178+ j->code_bits -= n;
2179+ return k;
2180+}
2181+
2182+stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
2183+{
2184+ unsigned int k;
2185+ if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
2186+ if (j->code_bits < 1) return 0; // ran out of bits from stream, return 0s intead of continuing
2187+ k = j->code_buffer;
2188+ j->code_buffer <<= 1;
2189+ --j->code_bits;
2190+ return k & 0x80000000;
2191+}
2192+
2193+// given a value that's at position X in the zigzag stream,
2194+// where does it appear in the 8x8 matrix coded as row-major?
2195+static const stbi_uc stbi__jpeg_dezigzag[64+15] =
2196+{
2197+ 0, 1, 8, 16, 9, 2, 3, 10,
2198+ 17, 24, 32, 25, 18, 11, 4, 5,
2199+ 12, 19, 26, 33, 40, 48, 41, 34,
2200+ 27, 20, 13, 6, 7, 14, 21, 28,
2201+ 35, 42, 49, 56, 57, 50, 43, 36,
2202+ 29, 22, 15, 23, 30, 37, 44, 51,
2203+ 58, 59, 52, 45, 38, 31, 39, 46,
2204+ 53, 60, 61, 54, 47, 55, 62, 63,
2205+ // let corrupt input sample past end
2206+ 63, 63, 63, 63, 63, 63, 63, 63,
2207+ 63, 63, 63, 63, 63, 63, 63
2208+};
2209+
2210+// decode one 64-entry block--
2211+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant)
2212+{
2213+ int diff,dc,k;
2214+ int t;
2215+
2216+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
2217+ t = stbi__jpeg_huff_decode(j, hdc);
2218+ if (t < 0 || t > 15) return stbi__err("bad huffman code","Corrupt JPEG");
2219+
2220+ // 0 all the ac values now so we can do it 32-bits at a time
2221+ memset(data,0,64*sizeof(data[0]));
2222+
2223+ diff = t ? stbi__extend_receive(j, t) : 0;
2224+ if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta","Corrupt JPEG");
2225+ dc = j->img_comp[b].dc_pred + diff;
2226+ j->img_comp[b].dc_pred = dc;
2227+ if (!stbi__mul2shorts_valid(dc, dequant[0])) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
2228+ data[0] = (short) (dc * dequant[0]);
2229+
2230+ // decode AC components, see JPEG spec
2231+ k = 1;
2232+ do {
2233+ unsigned int zig;
2234+ int c,r,s;
2235+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
2236+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
2237+ r = fac[c];
2238+ if (r) { // fast-AC path
2239+ k += (r >> 4) & 15; // run
2240+ s = r & 15; // combined length
2241+ if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available");
2242+ j->code_buffer <<= s;
2243+ j->code_bits -= s;
2244+ // decode into unzigzag'd location
2245+ zig = stbi__jpeg_dezigzag[k++];
2246+ data[zig] = (short) ((r >> 8) * dequant[zig]);
2247+ } else {
2248+ int rs = stbi__jpeg_huff_decode(j, hac);
2249+ if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
2250+ s = rs & 15;
2251+ r = rs >> 4;
2252+ if (s == 0) {
2253+ if (rs != 0xf0) break; // end block
2254+ k += 16;
2255+ } else {
2256+ k += r;
2257+ // decode into unzigzag'd location
2258+ zig = stbi__jpeg_dezigzag[k++];
2259+ data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]);
2260+ }
2261+ }
2262+ } while (k < 64);
2263+ return 1;
2264+}
2265+
2266+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b)
2267+{
2268+ int diff,dc;
2269+ int t;
2270+ if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
2271+
2272+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
2273+
2274+ if (j->succ_high == 0) {
2275+ // first scan for DC coefficient, must be first
2276+ memset(data,0,64*sizeof(data[0])); // 0 all the ac values now
2277+ t = stbi__jpeg_huff_decode(j, hdc);
2278+ if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
2279+ diff = t ? stbi__extend_receive(j, t) : 0;
2280+
2281+ if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta", "Corrupt JPEG");
2282+ dc = j->img_comp[b].dc_pred + diff;
2283+ j->img_comp[b].dc_pred = dc;
2284+ if (!stbi__mul2shorts_valid(dc, 1 << j->succ_low)) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
2285+ data[0] = (short) (dc * (1 << j->succ_low));
2286+ } else {
2287+ // refinement scan for DC coefficient
2288+ if (stbi__jpeg_get_bit(j))
2289+ data[0] += (short) (1 << j->succ_low);
2290+ }
2291+ return 1;
2292+}
2293+
2294+// @OPTIMIZE: store non-zigzagged during the decode passes,
2295+// and only de-zigzag when dequantizing
2296+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac)
2297+{
2298+ int k;
2299+ if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
2300+
2301+ if (j->succ_high == 0) {
2302+ int shift = j->succ_low;
2303+
2304+ if (j->eob_run) {
2305+ --j->eob_run;
2306+ return 1;
2307+ }
2308+
2309+ k = j->spec_start;
2310+ do {
2311+ unsigned int zig;
2312+ int c,r,s;
2313+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
2314+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
2315+ r = fac[c];
2316+ if (r) { // fast-AC path
2317+ k += (r >> 4) & 15; // run
2318+ s = r & 15; // combined length
2319+ if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available");
2320+ j->code_buffer <<= s;
2321+ j->code_bits -= s;
2322+ zig = stbi__jpeg_dezigzag[k++];
2323+ data[zig] = (short) ((r >> 8) * (1 << shift));
2324+ } else {
2325+ int rs = stbi__jpeg_huff_decode(j, hac);
2326+ if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
2327+ s = rs & 15;
2328+ r = rs >> 4;
2329+ if (s == 0) {
2330+ if (r < 15) {
2331+ j->eob_run = (1 << r);
2332+ if (r)
2333+ j->eob_run += stbi__jpeg_get_bits(j, r);
2334+ --j->eob_run;
2335+ break;
2336+ }
2337+ k += 16;
2338+ } else {
2339+ k += r;
2340+ zig = stbi__jpeg_dezigzag[k++];
2341+ data[zig] = (short) (stbi__extend_receive(j,s) * (1 << shift));
2342+ }
2343+ }
2344+ } while (k <= j->spec_end);
2345+ } else {
2346+ // refinement scan for these AC coefficients
2347+
2348+ short bit = (short) (1 << j->succ_low);
2349+
2350+ if (j->eob_run) {
2351+ --j->eob_run;
2352+ for (k = j->spec_start; k <= j->spec_end; ++k) {
2353+ short *p = &data[stbi__jpeg_dezigzag[k]];
2354+ if (*p != 0)
2355+ if (stbi__jpeg_get_bit(j))
2356+ if ((*p & bit)==0) {
2357+ if (*p > 0)
2358+ *p += bit;
2359+ else
2360+ *p -= bit;
2361+ }
2362+ }
2363+ } else {
2364+ k = j->spec_start;
2365+ do {
2366+ int r,s;
2367+ int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh
2368+ if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
2369+ s = rs & 15;
2370+ r = rs >> 4;
2371+ if (s == 0) {
2372+ if (r < 15) {
2373+ j->eob_run = (1 << r) - 1;
2374+ if (r)
2375+ j->eob_run += stbi__jpeg_get_bits(j, r);
2376+ r = 64; // force end of block
2377+ } else {
2378+ // r=15 s=0 should write 16 0s, so we just do
2379+ // a run of 15 0s and then write s (which is 0),
2380+ // so we don't have to do anything special here
2381+ }
2382+ } else {
2383+ if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
2384+ // sign bit
2385+ if (stbi__jpeg_get_bit(j))
2386+ s = bit;
2387+ else
2388+ s = -bit;
2389+ }
2390+
2391+ // advance by r
2392+ while (k <= j->spec_end) {
2393+ short *p = &data[stbi__jpeg_dezigzag[k++]];
2394+ if (*p != 0) {
2395+ if (stbi__jpeg_get_bit(j))
2396+ if ((*p & bit)==0) {
2397+ if (*p > 0)
2398+ *p += bit;
2399+ else
2400+ *p -= bit;
2401+ }
2402+ } else {
2403+ if (r == 0) {
2404+ *p = (short) s;
2405+ break;
2406+ }
2407+ --r;
2408+ }
2409+ }
2410+ } while (k <= j->spec_end);
2411+ }
2412+ }
2413+ return 1;
2414+}
2415+
2416+// take a -128..127 value and stbi__clamp it and convert to 0..255
2417+stbi_inline static stbi_uc stbi__clamp(int x)
2418+{
2419+ // trick to use a single test to catch both cases
2420+ if ((unsigned int) x > 255) {
2421+ if (x < 0) return 0;
2422+ if (x > 255) return 255;
2423+ }
2424+ return (stbi_uc) x;
2425+}
2426+
2427+#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5)))
2428+#define stbi__fsh(x) ((x) * 4096)
2429+
2430+// derived from jidctint -- DCT_ISLOW
2431+#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
2432+ int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
2433+ p2 = s2; \
2434+ p3 = s6; \
2435+ p1 = (p2+p3) * stbi__f2f(0.5411961f); \
2436+ t2 = p1 + p3*stbi__f2f(-1.847759065f); \
2437+ t3 = p1 + p2*stbi__f2f( 0.765366865f); \
2438+ p2 = s0; \
2439+ p3 = s4; \
2440+ t0 = stbi__fsh(p2+p3); \
2441+ t1 = stbi__fsh(p2-p3); \
2442+ x0 = t0+t3; \
2443+ x3 = t0-t3; \
2444+ x1 = t1+t2; \
2445+ x2 = t1-t2; \
2446+ t0 = s7; \
2447+ t1 = s5; \
2448+ t2 = s3; \
2449+ t3 = s1; \
2450+ p3 = t0+t2; \
2451+ p4 = t1+t3; \
2452+ p1 = t0+t3; \
2453+ p2 = t1+t2; \
2454+ p5 = (p3+p4)*stbi__f2f( 1.175875602f); \
2455+ t0 = t0*stbi__f2f( 0.298631336f); \
2456+ t1 = t1*stbi__f2f( 2.053119869f); \
2457+ t2 = t2*stbi__f2f( 3.072711026f); \
2458+ t3 = t3*stbi__f2f( 1.501321110f); \
2459+ p1 = p5 + p1*stbi__f2f(-0.899976223f); \
2460+ p2 = p5 + p2*stbi__f2f(-2.562915447f); \
2461+ p3 = p3*stbi__f2f(-1.961570560f); \
2462+ p4 = p4*stbi__f2f(-0.390180644f); \
2463+ t3 += p1+p4; \
2464+ t2 += p2+p3; \
2465+ t1 += p2+p4; \
2466+ t0 += p1+p3;
2467+
2468+static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
2469+{
2470+ int i,val[64],*v=val;
2471+ stbi_uc *o;
2472+ short *d = data;
2473+
2474+ // columns
2475+ for (i=0; i < 8; ++i,++d, ++v) {
2476+ // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
2477+ if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
2478+ && d[40]==0 && d[48]==0 && d[56]==0) {
2479+ // no shortcut 0 seconds
2480+ // (1|2|3|4|5|6|7)==0 0 seconds
2481+ // all separate -0.047 seconds
2482+ // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
2483+ int dcterm = d[0]*4;
2484+ v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
2485+ } else {
2486+ STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56])
2487+ // constants scaled things up by 1<<12; let's bring them back
2488+ // down, but keep 2 extra bits of precision
2489+ x0 += 512; x1 += 512; x2 += 512; x3 += 512;
2490+ v[ 0] = (x0+t3) >> 10;
2491+ v[56] = (x0-t3) >> 10;
2492+ v[ 8] = (x1+t2) >> 10;
2493+ v[48] = (x1-t2) >> 10;
2494+ v[16] = (x2+t1) >> 10;
2495+ v[40] = (x2-t1) >> 10;
2496+ v[24] = (x3+t0) >> 10;
2497+ v[32] = (x3-t0) >> 10;
2498+ }
2499+ }
2500+
2501+ for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
2502+ // no fast case since the first 1D IDCT spread components out
2503+ STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
2504+ // constants scaled things up by 1<<12, plus we had 1<<2 from first
2505+ // loop, plus horizontal and vertical each scale by sqrt(8) so together
2506+ // we've got an extra 1<<3, so 1<<17 total we need to remove.
2507+ // so we want to round that, which means adding 0.5 * 1<<17,
2508+ // aka 65536. Also, we'll end up with -128 to 127 that we want
2509+ // to encode as 0..255 by adding 128, so we'll add that before the shift
2510+ x0 += 65536 + (128<<17);
2511+ x1 += 65536 + (128<<17);
2512+ x2 += 65536 + (128<<17);
2513+ x3 += 65536 + (128<<17);
2514+ // tried computing the shifts into temps, or'ing the temps to see
2515+ // if any were out of range, but that was slower
2516+ o[0] = stbi__clamp((x0+t3) >> 17);
2517+ o[7] = stbi__clamp((x0-t3) >> 17);
2518+ o[1] = stbi__clamp((x1+t2) >> 17);
2519+ o[6] = stbi__clamp((x1-t2) >> 17);
2520+ o[2] = stbi__clamp((x2+t1) >> 17);
2521+ o[5] = stbi__clamp((x2-t1) >> 17);
2522+ o[3] = stbi__clamp((x3+t0) >> 17);
2523+ o[4] = stbi__clamp((x3-t0) >> 17);
2524+ }
2525+}
2526+
2527+#ifdef STBI_SSE2
2528+// sse2 integer IDCT. not the fastest possible implementation but it
2529+// produces bit-identical results to the generic C version so it's
2530+// fully "transparent".
2531+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
2532+{
2533+ // This is constructed to match our regular (generic) integer IDCT exactly.
2534+ __m128i row0, row1, row2, row3, row4, row5, row6, row7;
2535+ __m128i tmp;
2536+
2537+ // dot product constant: even elems=x, odd elems=y
2538+ #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y))
2539+
2540+ // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit)
2541+ // out(1) = c1[even]*x + c1[odd]*y
2542+ #define dct_rot(out0,out1, x,y,c0,c1) \
2543+ __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \
2544+ __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \
2545+ __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
2546+ __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
2547+ __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
2548+ __m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
2549+
2550+ // out = in << 12 (in 16-bit, out 32-bit)
2551+ #define dct_widen(out, in) \
2552+ __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
2553+ __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
2554+
2555+ // wide add
2556+ #define dct_wadd(out, a, b) \
2557+ __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
2558+ __m128i out##_h = _mm_add_epi32(a##_h, b##_h)
2559+
2560+ // wide sub
2561+ #define dct_wsub(out, a, b) \
2562+ __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
2563+ __m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
2564+
2565+ // butterfly a/b, add bias, then shift by "s" and pack
2566+ #define dct_bfly32o(out0, out1, a,b,bias,s) \
2567+ { \
2568+ __m128i abiased_l = _mm_add_epi32(a##_l, bias); \
2569+ __m128i abiased_h = _mm_add_epi32(a##_h, bias); \
2570+ dct_wadd(sum, abiased, b); \
2571+ dct_wsub(dif, abiased, b); \
2572+ out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
2573+ out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
2574+ }
2575+
2576+ // 8-bit interleave step (for transposes)
2577+ #define dct_interleave8(a, b) \
2578+ tmp = a; \
2579+ a = _mm_unpacklo_epi8(a, b); \
2580+ b = _mm_unpackhi_epi8(tmp, b)
2581+
2582+ // 16-bit interleave step (for transposes)
2583+ #define dct_interleave16(a, b) \
2584+ tmp = a; \
2585+ a = _mm_unpacklo_epi16(a, b); \
2586+ b = _mm_unpackhi_epi16(tmp, b)
2587+
2588+ #define dct_pass(bias,shift) \
2589+ { \
2590+ /* even part */ \
2591+ dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \
2592+ __m128i sum04 = _mm_add_epi16(row0, row4); \
2593+ __m128i dif04 = _mm_sub_epi16(row0, row4); \
2594+ dct_widen(t0e, sum04); \
2595+ dct_widen(t1e, dif04); \
2596+ dct_wadd(x0, t0e, t3e); \
2597+ dct_wsub(x3, t0e, t3e); \
2598+ dct_wadd(x1, t1e, t2e); \
2599+ dct_wsub(x2, t1e, t2e); \
2600+ /* odd part */ \
2601+ dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \
2602+ dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \
2603+ __m128i sum17 = _mm_add_epi16(row1, row7); \
2604+ __m128i sum35 = _mm_add_epi16(row3, row5); \
2605+ dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \
2606+ dct_wadd(x4, y0o, y4o); \
2607+ dct_wadd(x5, y1o, y5o); \
2608+ dct_wadd(x6, y2o, y5o); \
2609+ dct_wadd(x7, y3o, y4o); \
2610+ dct_bfly32o(row0,row7, x0,x7,bias,shift); \
2611+ dct_bfly32o(row1,row6, x1,x6,bias,shift); \
2612+ dct_bfly32o(row2,row5, x2,x5,bias,shift); \
2613+ dct_bfly32o(row3,row4, x3,x4,bias,shift); \
2614+ }
2615+
2616+ __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
2617+ __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f));
2618+ __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
2619+ __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
2620+ __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f));
2621+ __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f));
2622+ __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f));
2623+ __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f));
2624+
2625+ // rounding biases in column/row passes, see stbi__idct_block for explanation.
2626+ __m128i bias_0 = _mm_set1_epi32(512);
2627+ __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17));
2628+
2629+ // load
2630+ row0 = _mm_load_si128((const __m128i *) (data + 0*8));
2631+ row1 = _mm_load_si128((const __m128i *) (data + 1*8));
2632+ row2 = _mm_load_si128((const __m128i *) (data + 2*8));
2633+ row3 = _mm_load_si128((const __m128i *) (data + 3*8));
2634+ row4 = _mm_load_si128((const __m128i *) (data + 4*8));
2635+ row5 = _mm_load_si128((const __m128i *) (data + 5*8));
2636+ row6 = _mm_load_si128((const __m128i *) (data + 6*8));
2637+ row7 = _mm_load_si128((const __m128i *) (data + 7*8));
2638+
2639+ // column pass
2640+ dct_pass(bias_0, 10);
2641+
2642+ {
2643+ // 16bit 8x8 transpose pass 1
2644+ dct_interleave16(row0, row4);
2645+ dct_interleave16(row1, row5);
2646+ dct_interleave16(row2, row6);
2647+ dct_interleave16(row3, row7);
2648+
2649+ // transpose pass 2
2650+ dct_interleave16(row0, row2);
2651+ dct_interleave16(row1, row3);
2652+ dct_interleave16(row4, row6);
2653+ dct_interleave16(row5, row7);
2654+
2655+ // transpose pass 3
2656+ dct_interleave16(row0, row1);
2657+ dct_interleave16(row2, row3);
2658+ dct_interleave16(row4, row5);
2659+ dct_interleave16(row6, row7);
2660+ }
2661+
2662+ // row pass
2663+ dct_pass(bias_1, 17);
2664+
2665+ {
2666+ // pack
2667+ __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
2668+ __m128i p1 = _mm_packus_epi16(row2, row3);
2669+ __m128i p2 = _mm_packus_epi16(row4, row5);
2670+ __m128i p3 = _mm_packus_epi16(row6, row7);
2671+
2672+ // 8bit 8x8 transpose pass 1
2673+ dct_interleave8(p0, p2); // a0e0a1e1...
2674+ dct_interleave8(p1, p3); // c0g0c1g1...
2675+
2676+ // transpose pass 2
2677+ dct_interleave8(p0, p1); // a0c0e0g0...
2678+ dct_interleave8(p2, p3); // b0d0f0h0...
2679+
2680+ // transpose pass 3
2681+ dct_interleave8(p0, p2); // a0b0c0d0...
2682+ dct_interleave8(p1, p3); // a4b4c4d4...
2683+
2684+ // store
2685+ _mm_storel_epi64((__m128i *) out, p0); out += out_stride;
2686+ _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride;
2687+ _mm_storel_epi64((__m128i *) out, p2); out += out_stride;
2688+ _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride;
2689+ _mm_storel_epi64((__m128i *) out, p1); out += out_stride;
2690+ _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride;
2691+ _mm_storel_epi64((__m128i *) out, p3); out += out_stride;
2692+ _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e));
2693+ }
2694+
2695+#undef dct_const
2696+#undef dct_rot
2697+#undef dct_widen
2698+#undef dct_wadd
2699+#undef dct_wsub
2700+#undef dct_bfly32o
2701+#undef dct_interleave8
2702+#undef dct_interleave16
2703+#undef dct_pass
2704+}
2705+
2706+#endif // STBI_SSE2
2707+
2708+#ifdef STBI_NEON
2709+
2710+// NEON integer IDCT. should produce bit-identical
2711+// results to the generic C version.
2712+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
2713+{
2714+ int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
2715+
2716+ int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
2717+ int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
2718+ int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f));
2719+ int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f));
2720+ int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
2721+ int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
2722+ int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
2723+ int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
2724+ int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f));
2725+ int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f));
2726+ int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f));
2727+ int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f));
2728+
2729+#define dct_long_mul(out, inq, coeff) \
2730+ int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
2731+ int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
2732+
2733+#define dct_long_mac(out, acc, inq, coeff) \
2734+ int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
2735+ int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
2736+
2737+#define dct_widen(out, inq) \
2738+ int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
2739+ int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
2740+
2741+// wide add
2742+#define dct_wadd(out, a, b) \
2743+ int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
2744+ int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
2745+
2746+// wide sub
2747+#define dct_wsub(out, a, b) \
2748+ int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
2749+ int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
2750+
2751+// butterfly a/b, then shift using "shiftop" by "s" and pack
2752+#define dct_bfly32o(out0,out1, a,b,shiftop,s) \
2753+ { \
2754+ dct_wadd(sum, a, b); \
2755+ dct_wsub(dif, a, b); \
2756+ out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
2757+ out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
2758+ }
2759+
2760+#define dct_pass(shiftop, shift) \
2761+ { \
2762+ /* even part */ \
2763+ int16x8_t sum26 = vaddq_s16(row2, row6); \
2764+ dct_long_mul(p1e, sum26, rot0_0); \
2765+ dct_long_mac(t2e, p1e, row6, rot0_1); \
2766+ dct_long_mac(t3e, p1e, row2, rot0_2); \
2767+ int16x8_t sum04 = vaddq_s16(row0, row4); \
2768+ int16x8_t dif04 = vsubq_s16(row0, row4); \
2769+ dct_widen(t0e, sum04); \
2770+ dct_widen(t1e, dif04); \
2771+ dct_wadd(x0, t0e, t3e); \
2772+ dct_wsub(x3, t0e, t3e); \
2773+ dct_wadd(x1, t1e, t2e); \
2774+ dct_wsub(x2, t1e, t2e); \
2775+ /* odd part */ \
2776+ int16x8_t sum15 = vaddq_s16(row1, row5); \
2777+ int16x8_t sum17 = vaddq_s16(row1, row7); \
2778+ int16x8_t sum35 = vaddq_s16(row3, row5); \
2779+ int16x8_t sum37 = vaddq_s16(row3, row7); \
2780+ int16x8_t sumodd = vaddq_s16(sum17, sum35); \
2781+ dct_long_mul(p5o, sumodd, rot1_0); \
2782+ dct_long_mac(p1o, p5o, sum17, rot1_1); \
2783+ dct_long_mac(p2o, p5o, sum35, rot1_2); \
2784+ dct_long_mul(p3o, sum37, rot2_0); \
2785+ dct_long_mul(p4o, sum15, rot2_1); \
2786+ dct_wadd(sump13o, p1o, p3o); \
2787+ dct_wadd(sump24o, p2o, p4o); \
2788+ dct_wadd(sump23o, p2o, p3o); \
2789+ dct_wadd(sump14o, p1o, p4o); \
2790+ dct_long_mac(x4, sump13o, row7, rot3_0); \
2791+ dct_long_mac(x5, sump24o, row5, rot3_1); \
2792+ dct_long_mac(x6, sump23o, row3, rot3_2); \
2793+ dct_long_mac(x7, sump14o, row1, rot3_3); \
2794+ dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \
2795+ dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \
2796+ dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \
2797+ dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \
2798+ }
2799+
2800+ // load
2801+ row0 = vld1q_s16(data + 0*8);
2802+ row1 = vld1q_s16(data + 1*8);
2803+ row2 = vld1q_s16(data + 2*8);
2804+ row3 = vld1q_s16(data + 3*8);
2805+ row4 = vld1q_s16(data + 4*8);
2806+ row5 = vld1q_s16(data + 5*8);
2807+ row6 = vld1q_s16(data + 6*8);
2808+ row7 = vld1q_s16(data + 7*8);
2809+
2810+ // add DC bias
2811+ row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
2812+
2813+ // column pass
2814+ dct_pass(vrshrn_n_s32, 10);
2815+
2816+ // 16bit 8x8 transpose
2817+ {
2818+// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
2819+// whether compilers actually get this is another story, sadly.
2820+#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; }
2821+#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); }
2822+#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); }
2823+
2824+ // pass 1
2825+ dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
2826+ dct_trn16(row2, row3);
2827+ dct_trn16(row4, row5);
2828+ dct_trn16(row6, row7);
2829+
2830+ // pass 2
2831+ dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
2832+ dct_trn32(row1, row3);
2833+ dct_trn32(row4, row6);
2834+ dct_trn32(row5, row7);
2835+
2836+ // pass 3
2837+ dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
2838+ dct_trn64(row1, row5);
2839+ dct_trn64(row2, row6);
2840+ dct_trn64(row3, row7);
2841+
2842+#undef dct_trn16
2843+#undef dct_trn32
2844+#undef dct_trn64
2845+ }
2846+
2847+ // row pass
2848+ // vrshrn_n_s32 only supports shifts up to 16, we need
2849+ // 17. so do a non-rounding shift of 16 first then follow
2850+ // up with a rounding shift by 1.
2851+ dct_pass(vshrn_n_s32, 16);
2852+
2853+ {
2854+ // pack and round
2855+ uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
2856+ uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
2857+ uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
2858+ uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
2859+ uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
2860+ uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
2861+ uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
2862+ uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
2863+
2864+ // again, these can translate into one instruction, but often don't.
2865+#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; }
2866+#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); }
2867+#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); }
2868+
2869+ // sadly can't use interleaved stores here since we only write
2870+ // 8 bytes to each scan line!
2871+
2872+ // 8x8 8-bit transpose pass 1
2873+ dct_trn8_8(p0, p1);
2874+ dct_trn8_8(p2, p3);
2875+ dct_trn8_8(p4, p5);
2876+ dct_trn8_8(p6, p7);
2877+
2878+ // pass 2
2879+ dct_trn8_16(p0, p2);
2880+ dct_trn8_16(p1, p3);
2881+ dct_trn8_16(p4, p6);
2882+ dct_trn8_16(p5, p7);
2883+
2884+ // pass 3
2885+ dct_trn8_32(p0, p4);
2886+ dct_trn8_32(p1, p5);
2887+ dct_trn8_32(p2, p6);
2888+ dct_trn8_32(p3, p7);
2889+
2890+ // store
2891+ vst1_u8(out, p0); out += out_stride;
2892+ vst1_u8(out, p1); out += out_stride;
2893+ vst1_u8(out, p2); out += out_stride;
2894+ vst1_u8(out, p3); out += out_stride;
2895+ vst1_u8(out, p4); out += out_stride;
2896+ vst1_u8(out, p5); out += out_stride;
2897+ vst1_u8(out, p6); out += out_stride;
2898+ vst1_u8(out, p7);
2899+
2900+#undef dct_trn8_8
2901+#undef dct_trn8_16
2902+#undef dct_trn8_32
2903+ }
2904+
2905+#undef dct_long_mul
2906+#undef dct_long_mac
2907+#undef dct_widen
2908+#undef dct_wadd
2909+#undef dct_wsub
2910+#undef dct_bfly32o
2911+#undef dct_pass
2912+}
2913+
2914+#endif // STBI_NEON
2915+
2916+#define STBI__MARKER_none 0xff
2917+// if there's a pending marker from the entropy stream, return that
2918+// otherwise, fetch from the stream and get a marker. if there's no
2919+// marker, return 0xff, which is never a valid marker value
2920+static stbi_uc stbi__get_marker(stbi__jpeg *j)
2921+{
2922+ stbi_uc x;
2923+ if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; }
2924+ x = stbi__get8(j->s);
2925+ if (x != 0xff) return STBI__MARKER_none;
2926+ while (x == 0xff)
2927+ x = stbi__get8(j->s); // consume repeated 0xff fill bytes
2928+ return x;
2929+}
2930+
2931+// in each scan, we'll have scan_n components, and the order
2932+// of the components is specified by order[]
2933+#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
2934+
2935+// after a restart interval, stbi__jpeg_reset the entropy decoder and
2936+// the dc prediction
2937+static void stbi__jpeg_reset(stbi__jpeg *j)
2938+{
2939+ j->code_bits = 0;
2940+ j->code_buffer = 0;
2941+ j->nomore = 0;
2942+ j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0;
2943+ j->marker = STBI__MARKER_none;
2944+ j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
2945+ j->eob_run = 0;
2946+ // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
2947+ // since we don't even allow 1<<30 pixels
2948+}
2949+
2950+static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
2951+{
2952+ stbi__jpeg_reset(z);
2953+ if (!z->progressive) {
2954+ if (z->scan_n == 1) {
2955+ int i,j;
2956+ STBI_SIMD_ALIGN(short, data[64]);
2957+ int n = z->order[0];
2958+ // non-interleaved data, we just need to process one block at a time,
2959+ // in trivial scanline order
2960+ // number of blocks to do just depends on how many actual "pixels" this
2961+ // component has, independent of interleaved MCU blocking and such
2962+ int w = (z->img_comp[n].x+7) >> 3;
2963+ int h = (z->img_comp[n].y+7) >> 3;
2964+ for (j=0; j < h; ++j) {
2965+ for (i=0; i < w; ++i) {
2966+ int ha = z->img_comp[n].ha;
2967+ if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
2968+ z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
2969+ // every data block is an MCU, so countdown the restart interval
2970+ if (--z->todo <= 0) {
2971+ if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
2972+ // if it's NOT a restart, then just bail, so we get corrupt data
2973+ // rather than no data
2974+ if (!STBI__RESTART(z->marker)) return 1;
2975+ stbi__jpeg_reset(z);
2976+ }
2977+ }
2978+ }
2979+ return 1;
2980+ } else { // interleaved
2981+ int i,j,k,x,y;
2982+ STBI_SIMD_ALIGN(short, data[64]);
2983+ for (j=0; j < z->img_mcu_y; ++j) {
2984+ for (i=0; i < z->img_mcu_x; ++i) {
2985+ // scan an interleaved mcu... process scan_n components in order
2986+ for (k=0; k < z->scan_n; ++k) {
2987+ int n = z->order[k];
2988+ // scan out an mcu's worth of this component; that's just determined
2989+ // by the basic H and V specified for the component
2990+ for (y=0; y < z->img_comp[n].v; ++y) {
2991+ for (x=0; x < z->img_comp[n].h; ++x) {
2992+ int x2 = (i*z->img_comp[n].h + x)*8;
2993+ int y2 = (j*z->img_comp[n].v + y)*8;
2994+ int ha = z->img_comp[n].ha;
2995+ if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
2996+ z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data);
2997+ }
2998+ }
2999+ }
3000+ // after all interleaved components, that's an interleaved MCU,
3001+ // so now count down the restart interval
3002+ if (--z->todo <= 0) {
3003+ if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
3004+ if (!STBI__RESTART(z->marker)) return 1;
3005+ stbi__jpeg_reset(z);
3006+ }
3007+ }
3008+ }
3009+ return 1;
3010+ }
3011+ } else {
3012+ if (z->scan_n == 1) {
3013+ int i,j;
3014+ int n = z->order[0];
3015+ // non-interleaved data, we just need to process one block at a time,
3016+ // in trivial scanline order
3017+ // number of blocks to do just depends on how many actual "pixels" this
3018+ // component has, independent of interleaved MCU blocking and such
3019+ int w = (z->img_comp[n].x+7) >> 3;
3020+ int h = (z->img_comp[n].y+7) >> 3;
3021+ for (j=0; j < h; ++j) {
3022+ for (i=0; i < w; ++i) {
3023+ short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
3024+ if (z->spec_start == 0) {
3025+ if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
3026+ return 0;
3027+ } else {
3028+ int ha = z->img_comp[n].ha;
3029+ if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
3030+ return 0;
3031+ }
3032+ // every data block is an MCU, so countdown the restart interval
3033+ if (--z->todo <= 0) {
3034+ if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
3035+ if (!STBI__RESTART(z->marker)) return 1;
3036+ stbi__jpeg_reset(z);
3037+ }
3038+ }
3039+ }
3040+ return 1;
3041+ } else { // interleaved
3042+ int i,j,k,x,y;
3043+ for (j=0; j < z->img_mcu_y; ++j) {
3044+ for (i=0; i < z->img_mcu_x; ++i) {
3045+ // scan an interleaved mcu... process scan_n components in order
3046+ for (k=0; k < z->scan_n; ++k) {
3047+ int n = z->order[k];
3048+ // scan out an mcu's worth of this component; that's just determined
3049+ // by the basic H and V specified for the component
3050+ for (y=0; y < z->img_comp[n].v; ++y) {
3051+ for (x=0; x < z->img_comp[n].h; ++x) {
3052+ int x2 = (i*z->img_comp[n].h + x);
3053+ int y2 = (j*z->img_comp[n].v + y);
3054+ short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
3055+ if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
3056+ return 0;
3057+ }
3058+ }
3059+ }
3060+ // after all interleaved components, that's an interleaved MCU,
3061+ // so now count down the restart interval
3062+ if (--z->todo <= 0) {
3063+ if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
3064+ if (!STBI__RESTART(z->marker)) return 1;
3065+ stbi__jpeg_reset(z);
3066+ }
3067+ }
3068+ }
3069+ return 1;
3070+ }
3071+ }
3072+}
3073+
3074+static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant)
3075+{
3076+ int i;
3077+ for (i=0; i < 64; ++i)
3078+ data[i] *= dequant[i];
3079+}
3080+
3081+static void stbi__jpeg_finish(stbi__jpeg *z)
3082+{
3083+ if (z->progressive) {
3084+ // dequantize and idct the data
3085+ int i,j,n;
3086+ for (n=0; n < z->s->img_n; ++n) {
3087+ int w = (z->img_comp[n].x+7) >> 3;
3088+ int h = (z->img_comp[n].y+7) >> 3;
3089+ for (j=0; j < h; ++j) {
3090+ for (i=0; i < w; ++i) {
3091+ short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
3092+ stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
3093+ z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
3094+ }
3095+ }
3096+ }
3097+ }
3098+}
3099+
3100+static int stbi__process_marker(stbi__jpeg *z, int m)
3101+{
3102+ int L;
3103+ switch (m) {
3104+ case STBI__MARKER_none: // no marker found
3105+ return stbi__err("expected marker","Corrupt JPEG");
3106+
3107+ case 0xDD: // DRI - specify restart interval
3108+ if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG");
3109+ z->restart_interval = stbi__get16be(z->s);
3110+ return 1;
3111+
3112+ case 0xDB: // DQT - define quantization table
3113+ L = stbi__get16be(z->s)-2;
3114+ while (L > 0) {
3115+ int q = stbi__get8(z->s);
3116+ int p = q >> 4, sixteen = (p != 0);
3117+ int t = q & 15,i;
3118+ if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG");
3119+ if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
3120+
3121+ for (i=0; i < 64; ++i)
3122+ z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s));
3123+ L -= (sixteen ? 129 : 65);
3124+ }
3125+ return L==0;
3126+
3127+ case 0xC4: // DHT - define huffman table
3128+ L = stbi__get16be(z->s)-2;
3129+ while (L > 0) {
3130+ stbi_uc *v;
3131+ int sizes[16],i,n=0;
3132+ int q = stbi__get8(z->s);
3133+ int tc = q >> 4;
3134+ int th = q & 15;
3135+ if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG");
3136+ for (i=0; i < 16; ++i) {
3137+ sizes[i] = stbi__get8(z->s);
3138+ n += sizes[i];
3139+ }
3140+ if(n > 256) return stbi__err("bad DHT header","Corrupt JPEG"); // Loop over i < n would write past end of values!
3141+ L -= 17;
3142+ if (tc == 0) {
3143+ if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
3144+ v = z->huff_dc[th].values;
3145+ } else {
3146+ if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0;
3147+ v = z->huff_ac[th].values;
3148+ }
3149+ for (i=0; i < n; ++i)
3150+ v[i] = stbi__get8(z->s);
3151+ if (tc != 0)
3152+ stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
3153+ L -= n;
3154+ }
3155+ return L==0;
3156+ }
3157+
3158+ // check for comment block or APP blocks
3159+ if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
3160+ L = stbi__get16be(z->s);
3161+ if (L < 2) {
3162+ if (m == 0xFE)
3163+ return stbi__err("bad COM len","Corrupt JPEG");
3164+ else
3165+ return stbi__err("bad APP len","Corrupt JPEG");
3166+ }
3167+ L -= 2;
3168+
3169+ if (m == 0xE0 && L >= 5) { // JFIF APP0 segment
3170+ static const unsigned char tag[5] = {'J','F','I','F','\0'};
3171+ int ok = 1;
3172+ int i;
3173+ for (i=0; i < 5; ++i)
3174+ if (stbi__get8(z->s) != tag[i])
3175+ ok = 0;
3176+ L -= 5;
3177+ if (ok)
3178+ z->jfif = 1;
3179+ } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment
3180+ static const unsigned char tag[6] = {'A','d','o','b','e','\0'};
3181+ int ok = 1;
3182+ int i;
3183+ for (i=0; i < 6; ++i)
3184+ if (stbi__get8(z->s) != tag[i])
3185+ ok = 0;
3186+ L -= 6;
3187+ if (ok) {
3188+ stbi__get8(z->s); // version
3189+ stbi__get16be(z->s); // flags0
3190+ stbi__get16be(z->s); // flags1
3191+ z->app14_color_transform = stbi__get8(z->s); // color transform
3192+ L -= 6;
3193+ }
3194+ }
3195+
3196+ stbi__skip(z->s, L);
3197+ return 1;
3198+ }
3199+
3200+ return stbi__err("unknown marker","Corrupt JPEG");
3201+}
3202+
3203+// after we see SOS
3204+static int stbi__process_scan_header(stbi__jpeg *z)
3205+{
3206+ int i;
3207+ int Ls = stbi__get16be(z->s);
3208+ z->scan_n = stbi__get8(z->s);
3209+ if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG");
3210+ if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG");
3211+ for (i=0; i < z->scan_n; ++i) {
3212+ int id = stbi__get8(z->s), which;
3213+ int q = stbi__get8(z->s);
3214+ for (which = 0; which < z->s->img_n; ++which)
3215+ if (z->img_comp[which].id == id)
3216+ break;
3217+ if (which == z->s->img_n) return 0; // no match
3218+ z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG");
3219+ z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG");
3220+ z->order[i] = which;
3221+ }
3222+
3223+ {
3224+ int aa;
3225+ z->spec_start = stbi__get8(z->s);
3226+ z->spec_end = stbi__get8(z->s); // should be 63, but might be 0
3227+ aa = stbi__get8(z->s);
3228+ z->succ_high = (aa >> 4);
3229+ z->succ_low = (aa & 15);
3230+ if (z->progressive) {
3231+ if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
3232+ return stbi__err("bad SOS", "Corrupt JPEG");
3233+ } else {
3234+ if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG");
3235+ if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG");
3236+ z->spec_end = 63;
3237+ }
3238+ }
3239+
3240+ return 1;
3241+}
3242+
3243+static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why)
3244+{
3245+ int i;
3246+ for (i=0; i < ncomp; ++i) {
3247+ if (z->img_comp[i].raw_data) {
3248+ STBI_FREE(z->img_comp[i].raw_data);
3249+ z->img_comp[i].raw_data = NULL;
3250+ z->img_comp[i].data = NULL;
3251+ }
3252+ if (z->img_comp[i].raw_coeff) {
3253+ STBI_FREE(z->img_comp[i].raw_coeff);
3254+ z->img_comp[i].raw_coeff = 0;
3255+ z->img_comp[i].coeff = 0;
3256+ }
3257+ if (z->img_comp[i].linebuf) {
3258+ STBI_FREE(z->img_comp[i].linebuf);
3259+ z->img_comp[i].linebuf = NULL;
3260+ }
3261+ }
3262+ return why;
3263+}
3264+
3265+static int stbi__process_frame_header(stbi__jpeg *z, int scan)
3266+{
3267+ stbi__context *s = z->s;
3268+ int Lf,p,i,q, h_max=1,v_max=1,c;
3269+ Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG
3270+ p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
3271+ s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
3272+ s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires
3273+ if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
3274+ if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
3275+ c = stbi__get8(s);
3276+ if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG");
3277+ s->img_n = c;
3278+ for (i=0; i < c; ++i) {
3279+ z->img_comp[i].data = NULL;
3280+ z->img_comp[i].linebuf = NULL;
3281+ }
3282+
3283+ if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG");
3284+
3285+ z->rgb = 0;
3286+ for (i=0; i < s->img_n; ++i) {
3287+ static const unsigned char rgb[3] = { 'R', 'G', 'B' };
3288+ z->img_comp[i].id = stbi__get8(s);
3289+ if (s->img_n == 3 && z->img_comp[i].id == rgb[i])
3290+ ++z->rgb;
3291+ q = stbi__get8(s);
3292+ z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG");
3293+ z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG");
3294+ z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG");
3295+ }
3296+
3297+ if (scan != STBI__SCAN_load) return 1;
3298+
3299+ if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode");
3300+
3301+ for (i=0; i < s->img_n; ++i) {
3302+ if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
3303+ if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
3304+ }
3305+
3306+ // check that plane subsampling factors are integer ratios; our resamplers can't deal with fractional ratios
3307+ // and I've never seen a non-corrupted JPEG file actually use them
3308+ for (i=0; i < s->img_n; ++i) {
3309+ if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H","Corrupt JPEG");
3310+ if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V","Corrupt JPEG");
3311+ }
3312+
3313+ // compute interleaved mcu info
3314+ z->img_h_max = h_max;
3315+ z->img_v_max = v_max;
3316+ z->img_mcu_w = h_max * 8;
3317+ z->img_mcu_h = v_max * 8;
3318+ // these sizes can't be more than 17 bits
3319+ z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
3320+ z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
3321+
3322+ for (i=0; i < s->img_n; ++i) {
3323+ // number of effective pixels (e.g. for non-interleaved MCU)
3324+ z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
3325+ z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
3326+ // to simplify generation, we'll allocate enough memory to decode
3327+ // the bogus oversized data from using interleaved MCUs and their
3328+ // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
3329+ // discard the extra data until colorspace conversion
3330+ //
3331+ // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier)
3332+ // so these muls can't overflow with 32-bit ints (which we require)
3333+ z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
3334+ z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
3335+ z->img_comp[i].coeff = 0;
3336+ z->img_comp[i].raw_coeff = 0;
3337+ z->img_comp[i].linebuf = NULL;
3338+ z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15);
3339+ if (z->img_comp[i].raw_data == NULL)
3340+ return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
3341+ // align blocks for idct using mmx/sse
3342+ z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
3343+ if (z->progressive) {
3344+ // w2, h2 are multiples of 8 (see above)
3345+ z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8;
3346+ z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8;
3347+ z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15);
3348+ if (z->img_comp[i].raw_coeff == NULL)
3349+ return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
3350+ z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15);
3351+ }
3352+ }
3353+
3354+ return 1;
3355+}
3356+
3357+// use comparisons since in some cases we handle more than one case (e.g. SOF)
3358+#define stbi__DNL(x) ((x) == 0xdc)
3359+#define stbi__SOI(x) ((x) == 0xd8)
3360+#define stbi__EOI(x) ((x) == 0xd9)
3361+#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
3362+#define stbi__SOS(x) ((x) == 0xda)
3363+
3364+#define stbi__SOF_progressive(x) ((x) == 0xc2)
3365+
3366+static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
3367+{
3368+ int m;
3369+ z->jfif = 0;
3370+ z->app14_color_transform = -1; // valid values are 0,1,2
3371+ z->marker = STBI__MARKER_none; // initialize cached marker to empty
3372+ m = stbi__get_marker(z);
3373+ if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG");
3374+ if (scan == STBI__SCAN_type) return 1;
3375+ m = stbi__get_marker(z);
3376+ while (!stbi__SOF(m)) {
3377+ if (!stbi__process_marker(z,m)) return 0;
3378+ m = stbi__get_marker(z);
3379+ while (m == STBI__MARKER_none) {
3380+ // some files have extra padding after their blocks, so ok, we'll scan
3381+ if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
3382+ m = stbi__get_marker(z);
3383+ }
3384+ }
3385+ z->progressive = stbi__SOF_progressive(m);
3386+ if (!stbi__process_frame_header(z, scan)) return 0;
3387+ return 1;
3388+}
3389+
3390+static stbi_uc stbi__skip_jpeg_junk_at_end(stbi__jpeg *j)
3391+{
3392+ // some JPEGs have junk at end, skip over it but if we find what looks
3393+ // like a valid marker, resume there
3394+ while (!stbi__at_eof(j->s)) {
3395+ stbi_uc x = stbi__get8(j->s);
3396+ while (x == 0xff) { // might be a marker
3397+ if (stbi__at_eof(j->s)) return STBI__MARKER_none;
3398+ x = stbi__get8(j->s);
3399+ if (x != 0x00 && x != 0xff) {
3400+ // not a stuffed zero or lead-in to another marker, looks
3401+ // like an actual marker, return it
3402+ return x;
3403+ }
3404+ // stuffed zero has x=0 now which ends the loop, meaning we go
3405+ // back to regular scan loop.
3406+ // repeated 0xff keeps trying to read the next byte of the marker.
3407+ }
3408+ }
3409+ return STBI__MARKER_none;
3410+}
3411+
3412+// decode image to YCbCr format
3413+static int stbi__decode_jpeg_image(stbi__jpeg *j)
3414+{
3415+ int m;
3416+ for (m = 0; m < 4; m++) {
3417+ j->img_comp[m].raw_data = NULL;
3418+ j->img_comp[m].raw_coeff = NULL;
3419+ }
3420+ j->restart_interval = 0;
3421+ if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
3422+ m = stbi__get_marker(j);
3423+ while (!stbi__EOI(m)) {
3424+ if (stbi__SOS(m)) {
3425+ if (!stbi__process_scan_header(j)) return 0;
3426+ if (!stbi__parse_entropy_coded_data(j)) return 0;
3427+ if (j->marker == STBI__MARKER_none ) {
3428+ j->marker = stbi__skip_jpeg_junk_at_end(j);
3429+ // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
3430+ }
3431+ m = stbi__get_marker(j);
3432+ if (STBI__RESTART(m))
3433+ m = stbi__get_marker(j);
3434+ } else if (stbi__DNL(m)) {
3435+ int Ld = stbi__get16be(j->s);
3436+ stbi__uint32 NL = stbi__get16be(j->s);
3437+ if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG");
3438+ if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG");
3439+ m = stbi__get_marker(j);
3440+ } else {
3441+ if (!stbi__process_marker(j, m)) return 1;
3442+ m = stbi__get_marker(j);
3443+ }
3444+ }
3445+ if (j->progressive)
3446+ stbi__jpeg_finish(j);
3447+ return 1;
3448+}
3449+
3450+// static jfif-centered resampling (across block boundaries)
3451+
3452+typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1,
3453+ int w, int hs);
3454+
3455+#define stbi__div4(x) ((stbi_uc) ((x) >> 2))
3456+
3457+static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
3458+{
3459+ STBI_NOTUSED(out);
3460+ STBI_NOTUSED(in_far);
3461+ STBI_NOTUSED(w);
3462+ STBI_NOTUSED(hs);
3463+ return in_near;
3464+}
3465+
3466+static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
3467+{
3468+ // need to generate two samples vertically for every one in input
3469+ int i;
3470+ STBI_NOTUSED(hs);
3471+ for (i=0; i < w; ++i)
3472+ out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2);
3473+ return out;
3474+}
3475+
3476+static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
3477+{
3478+ // need to generate two samples horizontally for every one in input
3479+ int i;
3480+ stbi_uc *input = in_near;
3481+
3482+ if (w == 1) {
3483+ // if only one sample, can't do any interpolation
3484+ out[0] = out[1] = input[0];
3485+ return out;
3486+ }
3487+
3488+ out[0] = input[0];
3489+ out[1] = stbi__div4(input[0]*3 + input[1] + 2);
3490+ for (i=1; i < w-1; ++i) {
3491+ int n = 3*input[i]+2;
3492+ out[i*2+0] = stbi__div4(n+input[i-1]);
3493+ out[i*2+1] = stbi__div4(n+input[i+1]);
3494+ }
3495+ out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2);
3496+ out[i*2+1] = input[w-1];
3497+
3498+ STBI_NOTUSED(in_far);
3499+ STBI_NOTUSED(hs);
3500+
3501+ return out;
3502+}
3503+
3504+#define stbi__div16(x) ((stbi_uc) ((x) >> 4))
3505+
3506+static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
3507+{
3508+ // need to generate 2x2 samples for every one in input
3509+ int i,t0,t1;
3510+ if (w == 1) {
3511+ out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
3512+ return out;
3513+ }
3514+
3515+ t1 = 3*in_near[0] + in_far[0];
3516+ out[0] = stbi__div4(t1+2);
3517+ for (i=1; i < w; ++i) {
3518+ t0 = t1;
3519+ t1 = 3*in_near[i]+in_far[i];
3520+ out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
3521+ out[i*2 ] = stbi__div16(3*t1 + t0 + 8);
3522+ }
3523+ out[w*2-1] = stbi__div4(t1+2);
3524+
3525+ STBI_NOTUSED(hs);
3526+
3527+ return out;
3528+}
3529+
3530+#if defined(STBI_SSE2) || defined(STBI_NEON)
3531+static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
3532+{
3533+ // need to generate 2x2 samples for every one in input
3534+ int i=0,t0,t1;
3535+
3536+ if (w == 1) {
3537+ out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
3538+ return out;
3539+ }
3540+
3541+ t1 = 3*in_near[0] + in_far[0];
3542+ // process groups of 8 pixels for as long as we can.
3543+ // note we can't handle the last pixel in a row in this loop
3544+ // because we need to handle the filter boundary conditions.
3545+ for (; i < ((w-1) & ~7); i += 8) {
3546+#if defined(STBI_SSE2)
3547+ // load and perform the vertical filtering pass
3548+ // this uses 3*x + y = 4*x + (y - x)
3549+ __m128i zero = _mm_setzero_si128();
3550+ __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i));
3551+ __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i));
3552+ __m128i farw = _mm_unpacklo_epi8(farb, zero);
3553+ __m128i nearw = _mm_unpacklo_epi8(nearb, zero);
3554+ __m128i diff = _mm_sub_epi16(farw, nearw);
3555+ __m128i nears = _mm_slli_epi16(nearw, 2);
3556+ __m128i curr = _mm_add_epi16(nears, diff); // current row
3557+
3558+ // horizontal filter works the same based on shifted vers of current
3559+ // row. "prev" is current row shifted right by 1 pixel; we need to
3560+ // insert the previous pixel value (from t1).
3561+ // "next" is current row shifted left by 1 pixel, with first pixel
3562+ // of next block of 8 pixels added in.
3563+ __m128i prv0 = _mm_slli_si128(curr, 2);
3564+ __m128i nxt0 = _mm_srli_si128(curr, 2);
3565+ __m128i prev = _mm_insert_epi16(prv0, t1, 0);
3566+ __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7);
3567+
3568+ // horizontal filter, polyphase implementation since it's convenient:
3569+ // even pixels = 3*cur + prev = cur*4 + (prev - cur)
3570+ // odd pixels = 3*cur + next = cur*4 + (next - cur)
3571+ // note the shared term.
3572+ __m128i bias = _mm_set1_epi16(8);
3573+ __m128i curs = _mm_slli_epi16(curr, 2);
3574+ __m128i prvd = _mm_sub_epi16(prev, curr);
3575+ __m128i nxtd = _mm_sub_epi16(next, curr);
3576+ __m128i curb = _mm_add_epi16(curs, bias);
3577+ __m128i even = _mm_add_epi16(prvd, curb);
3578+ __m128i odd = _mm_add_epi16(nxtd, curb);
3579+
3580+ // interleave even and odd pixels, then undo scaling.
3581+ __m128i int0 = _mm_unpacklo_epi16(even, odd);
3582+ __m128i int1 = _mm_unpackhi_epi16(even, odd);
3583+ __m128i de0 = _mm_srli_epi16(int0, 4);
3584+ __m128i de1 = _mm_srli_epi16(int1, 4);
3585+
3586+ // pack and write output
3587+ __m128i outv = _mm_packus_epi16(de0, de1);
3588+ _mm_storeu_si128((__m128i *) (out + i*2), outv);
3589+#elif defined(STBI_NEON)
3590+ // load and perform the vertical filtering pass
3591+ // this uses 3*x + y = 4*x + (y - x)
3592+ uint8x8_t farb = vld1_u8(in_far + i);
3593+ uint8x8_t nearb = vld1_u8(in_near + i);
3594+ int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
3595+ int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
3596+ int16x8_t curr = vaddq_s16(nears, diff); // current row
3597+
3598+ // horizontal filter works the same based on shifted vers of current
3599+ // row. "prev" is current row shifted right by 1 pixel; we need to
3600+ // insert the previous pixel value (from t1).
3601+ // "next" is current row shifted left by 1 pixel, with first pixel
3602+ // of next block of 8 pixels added in.
3603+ int16x8_t prv0 = vextq_s16(curr, curr, 7);
3604+ int16x8_t nxt0 = vextq_s16(curr, curr, 1);
3605+ int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
3606+ int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7);
3607+
3608+ // horizontal filter, polyphase implementation since it's convenient:
3609+ // even pixels = 3*cur + prev = cur*4 + (prev - cur)
3610+ // odd pixels = 3*cur + next = cur*4 + (next - cur)
3611+ // note the shared term.
3612+ int16x8_t curs = vshlq_n_s16(curr, 2);
3613+ int16x8_t prvd = vsubq_s16(prev, curr);
3614+ int16x8_t nxtd = vsubq_s16(next, curr);
3615+ int16x8_t even = vaddq_s16(curs, prvd);
3616+ int16x8_t odd = vaddq_s16(curs, nxtd);
3617+
3618+ // undo scaling and round, then store with even/odd phases interleaved
3619+ uint8x8x2_t o;
3620+ o.val[0] = vqrshrun_n_s16(even, 4);
3621+ o.val[1] = vqrshrun_n_s16(odd, 4);
3622+ vst2_u8(out + i*2, o);
3623+#endif
3624+
3625+ // "previous" value for next iter
3626+ t1 = 3*in_near[i+7] + in_far[i+7];
3627+ }
3628+
3629+ t0 = t1;
3630+ t1 = 3*in_near[i] + in_far[i];
3631+ out[i*2] = stbi__div16(3*t1 + t0 + 8);
3632+
3633+ for (++i; i < w; ++i) {
3634+ t0 = t1;
3635+ t1 = 3*in_near[i]+in_far[i];
3636+ out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
3637+ out[i*2 ] = stbi__div16(3*t1 + t0 + 8);
3638+ }
3639+ out[w*2-1] = stbi__div4(t1+2);
3640+
3641+ STBI_NOTUSED(hs);
3642+
3643+ return out;
3644+}
3645+#endif
3646+
3647+static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
3648+{
3649+ // resample with nearest-neighbor
3650+ int i,j;
3651+ STBI_NOTUSED(in_far);
3652+ for (i=0; i < w; ++i)
3653+ for (j=0; j < hs; ++j)
3654+ out[i*hs+j] = in_near[i];
3655+ return out;
3656+}
3657+
3658+// this is a reduced-precision calculation of YCbCr-to-RGB introduced
3659+// to make sure the code produces the same results in both SIMD and scalar
3660+#define stbi__float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8)
3661+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
3662+{
3663+ int i;
3664+ for (i=0; i < count; ++i) {
3665+ int y_fixed = (y[i] << 20) + (1<<19); // rounding
3666+ int r,g,b;
3667+ int cr = pcr[i] - 128;
3668+ int cb = pcb[i] - 128;
3669+ r = y_fixed + cr* stbi__float2fixed(1.40200f);
3670+ g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
3671+ b = y_fixed + cb* stbi__float2fixed(1.77200f);
3672+ r >>= 20;
3673+ g >>= 20;
3674+ b >>= 20;
3675+ if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
3676+ if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
3677+ if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
3678+ out[0] = (stbi_uc)r;
3679+ out[1] = (stbi_uc)g;
3680+ out[2] = (stbi_uc)b;
3681+ out[3] = 255;
3682+ out += step;
3683+ }
3684+}
3685+
3686+#if defined(STBI_SSE2) || defined(STBI_NEON)
3687+static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step)
3688+{
3689+ int i = 0;
3690+
3691+#ifdef STBI_SSE2
3692+ // step == 3 is pretty ugly on the final interleave, and i'm not convinced
3693+ // it's useful in practice (you wouldn't use it for textures, for example).
3694+ // so just accelerate step == 4 case.
3695+ if (step == 4) {
3696+ // this is a fairly straightforward implementation and not super-optimized.
3697+ __m128i signflip = _mm_set1_epi8(-0x80);
3698+ __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f));
3699+ __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f));
3700+ __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f));
3701+ __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f));
3702+ __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128);
3703+ __m128i xw = _mm_set1_epi16(255); // alpha channel
3704+
3705+ for (; i+7 < count; i += 8) {
3706+ // load
3707+ __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i));
3708+ __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i));
3709+ __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i));
3710+ __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
3711+ __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
3712+
3713+ // unpack to short (and left-shift cr, cb by 8)
3714+ __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes);
3715+ __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
3716+ __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
3717+
3718+ // color transform
3719+ __m128i yws = _mm_srli_epi16(yw, 4);
3720+ __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
3721+ __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
3722+ __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
3723+ __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
3724+ __m128i rws = _mm_add_epi16(cr0, yws);
3725+ __m128i gwt = _mm_add_epi16(cb0, yws);
3726+ __m128i bws = _mm_add_epi16(yws, cb1);
3727+ __m128i gws = _mm_add_epi16(gwt, cr1);
3728+
3729+ // descale
3730+ __m128i rw = _mm_srai_epi16(rws, 4);
3731+ __m128i bw = _mm_srai_epi16(bws, 4);
3732+ __m128i gw = _mm_srai_epi16(gws, 4);
3733+
3734+ // back to byte, set up for transpose
3735+ __m128i brb = _mm_packus_epi16(rw, bw);
3736+ __m128i gxb = _mm_packus_epi16(gw, xw);
3737+
3738+ // transpose to interleave channels
3739+ __m128i t0 = _mm_unpacklo_epi8(brb, gxb);
3740+ __m128i t1 = _mm_unpackhi_epi8(brb, gxb);
3741+ __m128i o0 = _mm_unpacklo_epi16(t0, t1);
3742+ __m128i o1 = _mm_unpackhi_epi16(t0, t1);
3743+
3744+ // store
3745+ _mm_storeu_si128((__m128i *) (out + 0), o0);
3746+ _mm_storeu_si128((__m128i *) (out + 16), o1);
3747+ out += 32;
3748+ }
3749+ }
3750+#endif
3751+
3752+#ifdef STBI_NEON
3753+ // in this version, step=3 support would be easy to add. but is there demand?
3754+ if (step == 4) {
3755+ // this is a fairly straightforward implementation and not super-optimized.
3756+ uint8x8_t signflip = vdup_n_u8(0x80);
3757+ int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f));
3758+ int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f));
3759+ int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f));
3760+ int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f));
3761+
3762+ for (; i+7 < count; i += 8) {
3763+ // load
3764+ uint8x8_t y_bytes = vld1_u8(y + i);
3765+ uint8x8_t cr_bytes = vld1_u8(pcr + i);
3766+ uint8x8_t cb_bytes = vld1_u8(pcb + i);
3767+ int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
3768+ int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
3769+
3770+ // expand to s16
3771+ int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
3772+ int16x8_t crw = vshll_n_s8(cr_biased, 7);
3773+ int16x8_t cbw = vshll_n_s8(cb_biased, 7);
3774+
3775+ // color transform
3776+ int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
3777+ int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
3778+ int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
3779+ int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
3780+ int16x8_t rws = vaddq_s16(yws, cr0);
3781+ int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
3782+ int16x8_t bws = vaddq_s16(yws, cb1);
3783+
3784+ // undo scaling, round, convert to byte
3785+ uint8x8x4_t o;
3786+ o.val[0] = vqrshrun_n_s16(rws, 4);
3787+ o.val[1] = vqrshrun_n_s16(gws, 4);
3788+ o.val[2] = vqrshrun_n_s16(bws, 4);
3789+ o.val[3] = vdup_n_u8(255);
3790+
3791+ // store, interleaving r/g/b/a
3792+ vst4_u8(out, o);
3793+ out += 8*4;
3794+ }
3795+ }
3796+#endif
3797+
3798+ for (; i < count; ++i) {
3799+ int y_fixed = (y[i] << 20) + (1<<19); // rounding
3800+ int r,g,b;
3801+ int cr = pcr[i] - 128;
3802+ int cb = pcb[i] - 128;
3803+ r = y_fixed + cr* stbi__float2fixed(1.40200f);
3804+ g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
3805+ b = y_fixed + cb* stbi__float2fixed(1.77200f);
3806+ r >>= 20;
3807+ g >>= 20;
3808+ b >>= 20;
3809+ if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
3810+ if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
3811+ if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
3812+ out[0] = (stbi_uc)r;
3813+ out[1] = (stbi_uc)g;
3814+ out[2] = (stbi_uc)b;
3815+ out[3] = 255;
3816+ out += step;
3817+ }
3818+}
3819+#endif
3820+
3821+// set up the kernels
3822+static void stbi__setup_jpeg(stbi__jpeg *j)
3823+{
3824+ j->idct_block_kernel = stbi__idct_block;
3825+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
3826+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
3827+
3828+#ifdef STBI_SSE2
3829+ if (stbi__sse2_available()) {
3830+ j->idct_block_kernel = stbi__idct_simd;
3831+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
3832+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
3833+ }
3834+#endif
3835+
3836+#ifdef STBI_NEON
3837+ j->idct_block_kernel = stbi__idct_simd;
3838+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
3839+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
3840+#endif
3841+}
3842+
3843+// clean up the temporary component buffers
3844+static void stbi__cleanup_jpeg(stbi__jpeg *j)
3845+{
3846+ stbi__free_jpeg_components(j, j->s->img_n, 0);
3847+}
3848+
3849+typedef struct
3850+{
3851+ resample_row_func resample;
3852+ stbi_uc *line0,*line1;
3853+ int hs,vs; // expansion factor in each axis
3854+ int w_lores; // horizontal pixels pre-expansion
3855+ int ystep; // how far through vertical expansion we are
3856+ int ypos; // which pre-expansion row we're on
3857+} stbi__resample;
3858+
3859+// fast 0..255 * 0..255 => 0..255 rounded multiplication
3860+static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y)
3861+{
3862+ unsigned int t = x*y + 128;
3863+ return (stbi_uc) ((t + (t >>8)) >> 8);
3864+}
3865+
3866+static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
3867+{
3868+ int n, decode_n, is_rgb;
3869+ z->s->img_n = 0; // make stbi__cleanup_jpeg safe
3870+
3871+ // validate req_comp
3872+ if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
3873+
3874+ // load a jpeg image from whichever source, but leave in YCbCr format
3875+ if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; }
3876+
3877+ // determine actual number of components to generate
3878+ n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1;
3879+
3880+ is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif));
3881+
3882+ if (z->s->img_n == 3 && n < 3 && !is_rgb)
3883+ decode_n = 1;
3884+ else
3885+ decode_n = z->s->img_n;
3886+
3887+ // nothing to do if no components requested; check this now to avoid
3888+ // accessing uninitialized coutput[0] later
3889+ if (decode_n <= 0) { stbi__cleanup_jpeg(z); return NULL; }
3890+
3891+ // resample and color-convert
3892+ {
3893+ int k;
3894+ unsigned int i,j;
3895+ stbi_uc *output;
3896+ stbi_uc *coutput[4] = { NULL, NULL, NULL, NULL };
3897+
3898+ stbi__resample res_comp[4];
3899+
3900+ for (k=0; k < decode_n; ++k) {
3901+ stbi__resample *r = &res_comp[k];
3902+
3903+ // allocate line buffer big enough for upsampling off the edges
3904+ // with upsample factor of 4
3905+ z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3);
3906+ if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
3907+
3908+ r->hs = z->img_h_max / z->img_comp[k].h;
3909+ r->vs = z->img_v_max / z->img_comp[k].v;
3910+ r->ystep = r->vs >> 1;
3911+ r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
3912+ r->ypos = 0;
3913+ r->line0 = r->line1 = z->img_comp[k].data;
3914+
3915+ if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
3916+ else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2;
3917+ else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2;
3918+ else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel;
3919+ else r->resample = stbi__resample_row_generic;
3920+ }
3921+
3922+ // can't error after this so, this is safe
3923+ output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1);
3924+ if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
3925+
3926+ // now go ahead and resample
3927+ for (j=0; j < z->s->img_y; ++j) {
3928+ stbi_uc *out = output + n * z->s->img_x * j;
3929+ for (k=0; k < decode_n; ++k) {
3930+ stbi__resample *r = &res_comp[k];
3931+ int y_bot = r->ystep >= (r->vs >> 1);
3932+ coutput[k] = r->resample(z->img_comp[k].linebuf,
3933+ y_bot ? r->line1 : r->line0,
3934+ y_bot ? r->line0 : r->line1,
3935+ r->w_lores, r->hs);
3936+ if (++r->ystep >= r->vs) {
3937+ r->ystep = 0;
3938+ r->line0 = r->line1;
3939+ if (++r->ypos < z->img_comp[k].y)
3940+ r->line1 += z->img_comp[k].w2;
3941+ }
3942+ }
3943+ if (n >= 3) {
3944+ stbi_uc *y = coutput[0];
3945+ if (z->s->img_n == 3) {
3946+ if (is_rgb) {
3947+ for (i=0; i < z->s->img_x; ++i) {
3948+ out[0] = y[i];
3949+ out[1] = coutput[1][i];
3950+ out[2] = coutput[2][i];
3951+ out[3] = 255;
3952+ out += n;
3953+ }
3954+ } else {
3955+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
3956+ }
3957+ } else if (z->s->img_n == 4) {
3958+ if (z->app14_color_transform == 0) { // CMYK
3959+ for (i=0; i < z->s->img_x; ++i) {
3960+ stbi_uc m = coutput[3][i];
3961+ out[0] = stbi__blinn_8x8(coutput[0][i], m);
3962+ out[1] = stbi__blinn_8x8(coutput[1][i], m);
3963+ out[2] = stbi__blinn_8x8(coutput[2][i], m);
3964+ out[3] = 255;
3965+ out += n;
3966+ }
3967+ } else if (z->app14_color_transform == 2) { // YCCK
3968+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
3969+ for (i=0; i < z->s->img_x; ++i) {
3970+ stbi_uc m = coutput[3][i];
3971+ out[0] = stbi__blinn_8x8(255 - out[0], m);
3972+ out[1] = stbi__blinn_8x8(255 - out[1], m);
3973+ out[2] = stbi__blinn_8x8(255 - out[2], m);
3974+ out += n;
3975+ }
3976+ } else { // YCbCr + alpha? Ignore the fourth channel for now
3977+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
3978+ }
3979+ } else
3980+ for (i=0; i < z->s->img_x; ++i) {
3981+ out[0] = out[1] = out[2] = y[i];
3982+ out[3] = 255; // not used if n==3
3983+ out += n;
3984+ }
3985+ } else {
3986+ if (is_rgb) {
3987+ if (n == 1)
3988+ for (i=0; i < z->s->img_x; ++i)
3989+ *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
3990+ else {
3991+ for (i=0; i < z->s->img_x; ++i, out += 2) {
3992+ out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
3993+ out[1] = 255;
3994+ }
3995+ }
3996+ } else if (z->s->img_n == 4 && z->app14_color_transform == 0) {
3997+ for (i=0; i < z->s->img_x; ++i) {
3998+ stbi_uc m = coutput[3][i];
3999+ stbi_uc r = stbi__blinn_8x8(coutput[0][i], m);
4000+ stbi_uc g = stbi__blinn_8x8(coutput[1][i], m);
4001+ stbi_uc b = stbi__blinn_8x8(coutput[2][i], m);
4002+ out[0] = stbi__compute_y(r, g, b);
4003+ out[1] = 255;
4004+ out += n;
4005+ }
4006+ } else if (z->s->img_n == 4 && z->app14_color_transform == 2) {
4007+ for (i=0; i < z->s->img_x; ++i) {
4008+ out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]);
4009+ out[1] = 255;
4010+ out += n;
4011+ }
4012+ } else {
4013+ stbi_uc *y = coutput[0];
4014+ if (n == 1)
4015+ for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
4016+ else
4017+ for (i=0; i < z->s->img_x; ++i) { *out++ = y[i]; *out++ = 255; }
4018+ }
4019+ }
4020+ }
4021+ stbi__cleanup_jpeg(z);
4022+ *out_x = z->s->img_x;
4023+ *out_y = z->s->img_y;
4024+ if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output
4025+ return output;
4026+ }
4027+}
4028+
4029+static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
4030+{
4031+ unsigned char* result;
4032+ stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg));
4033+ if (!j) return stbi__errpuc("outofmem", "Out of memory");
4034+ memset(j, 0, sizeof(stbi__jpeg));
4035+ STBI_NOTUSED(ri);
4036+ j->s = s;
4037+ stbi__setup_jpeg(j);
4038+ result = load_jpeg_image(j, x,y,comp,req_comp);
4039+ STBI_FREE(j);
4040+ return result;
4041+}
4042+
4043+static int stbi__jpeg_test(stbi__context *s)
4044+{
4045+ int r;
4046+ stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
4047+ if (!j) return stbi__err("outofmem", "Out of memory");
4048+ memset(j, 0, sizeof(stbi__jpeg));
4049+ j->s = s;
4050+ stbi__setup_jpeg(j);
4051+ r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
4052+ stbi__rewind(s);
4053+ STBI_FREE(j);
4054+ return r;
4055+}
4056+
4057+static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
4058+{
4059+ if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
4060+ stbi__rewind( j->s );
4061+ return 0;
4062+ }
4063+ if (x) *x = j->s->img_x;
4064+ if (y) *y = j->s->img_y;
4065+ if (comp) *comp = j->s->img_n >= 3 ? 3 : 1;
4066+ return 1;
4067+}
4068+
4069+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
4070+{
4071+ int result;
4072+ stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg)));
4073+ if (!j) return stbi__err("outofmem", "Out of memory");
4074+ memset(j, 0, sizeof(stbi__jpeg));
4075+ j->s = s;
4076+ result = stbi__jpeg_info_raw(j, x, y, comp);
4077+ STBI_FREE(j);
4078+ return result;
4079+}
4080+#endif
4081+
4082+// public domain zlib decode v0.2 Sean Barrett 2006-11-18
4083+// simple implementation
4084+// - all input must be provided in an upfront buffer
4085+// - all output is written to a single output buffer (can malloc/realloc)
4086+// performance
4087+// - fast huffman
4088+
4089+#ifndef STBI_NO_ZLIB
4090+
4091+// fast-way is faster to check than jpeg huffman, but slow way is slower
4092+#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables
4093+#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1)
4094+#define STBI__ZNSYMS 288 // number of symbols in literal/length alphabet
4095+
4096+// zlib-style huffman encoding
4097+// (jpegs packs from left, zlib from right, so can't share code)
4098+typedef struct
4099+{
4100+ stbi__uint16 fast[1 << STBI__ZFAST_BITS];
4101+ stbi__uint16 firstcode[16];
4102+ int maxcode[17];
4103+ stbi__uint16 firstsymbol[16];
4104+ stbi_uc size[STBI__ZNSYMS];
4105+ stbi__uint16 value[STBI__ZNSYMS];
4106+} stbi__zhuffman;
4107+
4108+stbi_inline static int stbi__bitreverse16(int n)
4109+{
4110+ n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
4111+ n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
4112+ n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
4113+ n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
4114+ return n;
4115+}
4116+
4117+stbi_inline static int stbi__bit_reverse(int v, int bits)
4118+{
4119+ STBI_ASSERT(bits <= 16);
4120+ // to bit reverse n bits, reverse 16 and shift
4121+ // e.g. 11 bits, bit reverse and shift away 5
4122+ return stbi__bitreverse16(v) >> (16-bits);
4123+}
4124+
4125+static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num)
4126+{
4127+ int i,k=0;
4128+ int code, next_code[16], sizes[17];
4129+
4130+ // DEFLATE spec for generating codes
4131+ memset(sizes, 0, sizeof(sizes));
4132+ memset(z->fast, 0, sizeof(z->fast));
4133+ for (i=0; i < num; ++i)
4134+ ++sizes[sizelist[i]];
4135+ sizes[0] = 0;
4136+ for (i=1; i < 16; ++i)
4137+ if (sizes[i] > (1 << i))
4138+ return stbi__err("bad sizes", "Corrupt PNG");
4139+ code = 0;
4140+ for (i=1; i < 16; ++i) {
4141+ next_code[i] = code;
4142+ z->firstcode[i] = (stbi__uint16) code;
4143+ z->firstsymbol[i] = (stbi__uint16) k;
4144+ code = (code + sizes[i]);
4145+ if (sizes[i])
4146+ if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
4147+ z->maxcode[i] = code << (16-i); // preshift for inner loop
4148+ code <<= 1;
4149+ k += sizes[i];
4150+ }
4151+ z->maxcode[16] = 0x10000; // sentinel
4152+ for (i=0; i < num; ++i) {
4153+ int s = sizelist[i];
4154+ if (s) {
4155+ int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
4156+ stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i);
4157+ z->size [c] = (stbi_uc ) s;
4158+ z->value[c] = (stbi__uint16) i;
4159+ if (s <= STBI__ZFAST_BITS) {
4160+ int j = stbi__bit_reverse(next_code[s],s);
4161+ while (j < (1 << STBI__ZFAST_BITS)) {
4162+ z->fast[j] = fastv;
4163+ j += (1 << s);
4164+ }
4165+ }
4166+ ++next_code[s];
4167+ }
4168+ }
4169+ return 1;
4170+}
4171+
4172+// zlib-from-memory implementation for PNG reading
4173+// because PNG allows splitting the zlib stream arbitrarily,
4174+// and it's annoying structurally to have PNG call ZLIB call PNG,
4175+// we require PNG read all the IDATs and combine them into a single
4176+// memory buffer
4177+
4178+typedef struct
4179+{
4180+ stbi_uc *zbuffer, *zbuffer_end;
4181+ int num_bits;
4182+ int hit_zeof_once;
4183+ stbi__uint32 code_buffer;
4184+
4185+ char *zout;
4186+ char *zout_start;
4187+ char *zout_end;
4188+ int z_expandable;
4189+
4190+ stbi__zhuffman z_length, z_distance;
4191+} stbi__zbuf;
4192+
4193+stbi_inline static int stbi__zeof(stbi__zbuf *z)
4194+{
4195+ return (z->zbuffer >= z->zbuffer_end);
4196+}
4197+
4198+stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
4199+{
4200+ return stbi__zeof(z) ? 0 : *z->zbuffer++;
4201+}
4202+
4203+static void stbi__fill_bits(stbi__zbuf *z)
4204+{
4205+ do {
4206+ if (z->code_buffer >= (1U << z->num_bits)) {
4207+ z->zbuffer = z->zbuffer_end; /* treat this as EOF so we fail. */
4208+ return;
4209+ }
4210+ z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits;
4211+ z->num_bits += 8;
4212+ } while (z->num_bits <= 24);
4213+}
4214+
4215+stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n)
4216+{
4217+ unsigned int k;
4218+ if (z->num_bits < n) stbi__fill_bits(z);
4219+ k = z->code_buffer & ((1 << n) - 1);
4220+ z->code_buffer >>= n;
4221+ z->num_bits -= n;
4222+ return k;
4223+}
4224+
4225+static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
4226+{
4227+ int b,s,k;
4228+ // not resolved by fast table, so compute it the slow way
4229+ // use jpeg approach, which requires MSbits at top
4230+ k = stbi__bit_reverse(a->code_buffer, 16);
4231+ for (s=STBI__ZFAST_BITS+1; ; ++s)
4232+ if (k < z->maxcode[s])
4233+ break;
4234+ if (s >= 16) return -1; // invalid code!
4235+ // code size is s, so:
4236+ b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
4237+ if (b >= STBI__ZNSYMS) return -1; // some data was corrupt somewhere!
4238+ if (z->size[b] != s) return -1; // was originally an assert, but report failure instead.
4239+ a->code_buffer >>= s;
4240+ a->num_bits -= s;
4241+ return z->value[b];
4242+}
4243+
4244+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
4245+{
4246+ int b,s;
4247+ if (a->num_bits < 16) {
4248+ if (stbi__zeof(a)) {
4249+ if (!a->hit_zeof_once) {
4250+ // This is the first time we hit eof, insert 16 extra padding btis
4251+ // to allow us to keep going; if we actually consume any of them
4252+ // though, that is invalid data. This is caught later.
4253+ a->hit_zeof_once = 1;
4254+ a->num_bits += 16; // add 16 implicit zero bits
4255+ } else {
4256+ // We already inserted our extra 16 padding bits and are again
4257+ // out, this stream is actually prematurely terminated.
4258+ return -1;
4259+ }
4260+ } else {
4261+ stbi__fill_bits(a);
4262+ }
4263+ }
4264+ b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
4265+ if (b) {
4266+ s = b >> 9;
4267+ a->code_buffer >>= s;
4268+ a->num_bits -= s;
4269+ return b & 511;
4270+ }
4271+ return stbi__zhuffman_decode_slowpath(a, z);
4272+}
4273+
4274+static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes
4275+{
4276+ char *q;
4277+ unsigned int cur, limit, old_limit;
4278+ z->zout = zout;
4279+ if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
4280+ cur = (unsigned int) (z->zout - z->zout_start);
4281+ limit = old_limit = (unsigned) (z->zout_end - z->zout_start);
4282+ if (UINT_MAX - cur < (unsigned) n) return stbi__err("outofmem", "Out of memory");
4283+ while (cur + n > limit) {
4284+ if(limit > UINT_MAX / 2) return stbi__err("outofmem", "Out of memory");
4285+ limit *= 2;
4286+ }
4287+ q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
4288+ STBI_NOTUSED(old_limit);
4289+ if (q == NULL) return stbi__err("outofmem", "Out of memory");
4290+ z->zout_start = q;
4291+ z->zout = q + cur;
4292+ z->zout_end = q + limit;
4293+ return 1;
4294+}
4295+
4296+static const int stbi__zlength_base[31] = {
4297+ 3,4,5,6,7,8,9,10,11,13,
4298+ 15,17,19,23,27,31,35,43,51,59,
4299+ 67,83,99,115,131,163,195,227,258,0,0 };
4300+
4301+static const int stbi__zlength_extra[31]=
4302+{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
4303+
4304+static const int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
4305+257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
4306+
4307+static const int stbi__zdist_extra[32] =
4308+{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
4309+
4310+static int stbi__parse_huffman_block(stbi__zbuf *a)
4311+{
4312+ char *zout = a->zout;
4313+ for(;;) {
4314+ int z = stbi__zhuffman_decode(a, &a->z_length);
4315+ if (z < 256) {
4316+ if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes
4317+ if (zout >= a->zout_end) {
4318+ if (!stbi__zexpand(a, zout, 1)) return 0;
4319+ zout = a->zout;
4320+ }
4321+ *zout++ = (char) z;
4322+ } else {
4323+ stbi_uc *p;
4324+ int len,dist;
4325+ if (z == 256) {
4326+ a->zout = zout;
4327+ if (a->hit_zeof_once && a->num_bits < 16) {
4328+ // The first time we hit zeof, we inserted 16 extra zero bits into our bit
4329+ // buffer so the decoder can just do its speculative decoding. But if we
4330+ // actually consumed any of those bits (which is the case when num_bits < 16),
4331+ // the stream actually read past the end so it is malformed.
4332+ return stbi__err("unexpected end","Corrupt PNG");
4333+ }
4334+ return 1;
4335+ }
4336+ if (z >= 286) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, length codes 286 and 287 must not appear in compressed data
4337+ z -= 257;
4338+ len = stbi__zlength_base[z];
4339+ if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
4340+ z = stbi__zhuffman_decode(a, &a->z_distance);
4341+ if (z < 0 || z >= 30) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, distance codes 30 and 31 must not appear in compressed data
4342+ dist = stbi__zdist_base[z];
4343+ if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
4344+ if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
4345+ if (len > a->zout_end - zout) {
4346+ if (!stbi__zexpand(a, zout, len)) return 0;
4347+ zout = a->zout;
4348+ }
4349+ p = (stbi_uc *) (zout - dist);
4350+ if (dist == 1) { // run of one byte; common in images.
4351+ stbi_uc v = *p;
4352+ if (len) { do *zout++ = v; while (--len); }
4353+ } else {
4354+ if (len) { do *zout++ = *p++; while (--len); }
4355+ }
4356+ }
4357+ }
4358+}
4359+
4360+static int stbi__compute_huffman_codes(stbi__zbuf *a)
4361+{
4362+ static const stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
4363+ stbi__zhuffman z_codelength;
4364+ stbi_uc lencodes[286+32+137];//padding for maximum single op
4365+ stbi_uc codelength_sizes[19];
4366+ int i,n;
4367+
4368+ int hlit = stbi__zreceive(a,5) + 257;
4369+ int hdist = stbi__zreceive(a,5) + 1;
4370+ int hclen = stbi__zreceive(a,4) + 4;
4371+ int ntot = hlit + hdist;
4372+
4373+ memset(codelength_sizes, 0, sizeof(codelength_sizes));
4374+ for (i=0; i < hclen; ++i) {
4375+ int s = stbi__zreceive(a,3);
4376+ codelength_sizes[length_dezigzag[i]] = (stbi_uc) s;
4377+ }
4378+ if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
4379+
4380+ n = 0;
4381+ while (n < ntot) {
4382+ int c = stbi__zhuffman_decode(a, &z_codelength);
4383+ if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
4384+ if (c < 16)
4385+ lencodes[n++] = (stbi_uc) c;
4386+ else {
4387+ stbi_uc fill = 0;
4388+ if (c == 16) {
4389+ c = stbi__zreceive(a,2)+3;
4390+ if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG");
4391+ fill = lencodes[n-1];
4392+ } else if (c == 17) {
4393+ c = stbi__zreceive(a,3)+3;
4394+ } else if (c == 18) {
4395+ c = stbi__zreceive(a,7)+11;
4396+ } else {
4397+ return stbi__err("bad codelengths", "Corrupt PNG");
4398+ }
4399+ if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG");
4400+ memset(lencodes+n, fill, c);
4401+ n += c;
4402+ }
4403+ }
4404+ if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG");
4405+ if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
4406+ if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
4407+ return 1;
4408+}
4409+
4410+static int stbi__parse_uncompressed_block(stbi__zbuf *a)
4411+{
4412+ stbi_uc header[4];
4413+ int len,nlen,k;
4414+ if (a->num_bits & 7)
4415+ stbi__zreceive(a, a->num_bits & 7); // discard
4416+ // drain the bit-packed data into header
4417+ k = 0;
4418+ while (a->num_bits > 0) {
4419+ header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check
4420+ a->code_buffer >>= 8;
4421+ a->num_bits -= 8;
4422+ }
4423+ if (a->num_bits < 0) return stbi__err("zlib corrupt","Corrupt PNG");
4424+ // now fill header the normal way
4425+ while (k < 4)
4426+ header[k++] = stbi__zget8(a);
4427+ len = header[1] * 256 + header[0];
4428+ nlen = header[3] * 256 + header[2];
4429+ if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG");
4430+ if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG");
4431+ if (a->zout + len > a->zout_end)
4432+ if (!stbi__zexpand(a, a->zout, len)) return 0;
4433+ memcpy(a->zout, a->zbuffer, len);
4434+ a->zbuffer += len;
4435+ a->zout += len;
4436+ return 1;
4437+}
4438+
4439+static int stbi__parse_zlib_header(stbi__zbuf *a)
4440+{
4441+ int cmf = stbi__zget8(a);
4442+ int cm = cmf & 15;
4443+ /* int cinfo = cmf >> 4; */
4444+ int flg = stbi__zget8(a);
4445+ if (stbi__zeof(a)) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
4446+ if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
4447+ if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
4448+ if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png
4449+ // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
4450+ return 1;
4451+}
4452+
4453+static const stbi_uc stbi__zdefault_length[STBI__ZNSYMS] =
4454+{
4455+ 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
4456+ 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
4457+ 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
4458+ 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
4459+ 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
4460+ 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
4461+ 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
4462+ 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
4463+ 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8
4464+};
4465+static const stbi_uc stbi__zdefault_distance[32] =
4466+{
4467+ 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
4468+};
4469+/*
4470+Init algorithm:
4471+{
4472+ int i; // use <= to match clearly with spec
4473+ for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8;
4474+ for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9;
4475+ for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7;
4476+ for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8;
4477+
4478+ for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5;
4479+}
4480+*/
4481+
4482+static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
4483+{
4484+ int final, type;
4485+ if (parse_header)
4486+ if (!stbi__parse_zlib_header(a)) return 0;
4487+ a->num_bits = 0;
4488+ a->code_buffer = 0;
4489+ a->hit_zeof_once = 0;
4490+ do {
4491+ final = stbi__zreceive(a,1);
4492+ type = stbi__zreceive(a,2);
4493+ if (type == 0) {
4494+ if (!stbi__parse_uncompressed_block(a)) return 0;
4495+ } else if (type == 3) {
4496+ return 0;
4497+ } else {
4498+ if (type == 1) {
4499+ // use fixed code lengths
4500+ if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , STBI__ZNSYMS)) return 0;
4501+ if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0;
4502+ } else {
4503+ if (!stbi__compute_huffman_codes(a)) return 0;
4504+ }
4505+ if (!stbi__parse_huffman_block(a)) return 0;
4506+ }
4507+ } while (!final);
4508+ return 1;
4509+}
4510+
4511+static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header)
4512+{
4513+ a->zout_start = obuf;
4514+ a->zout = obuf;
4515+ a->zout_end = obuf + olen;
4516+ a->z_expandable = exp;
4517+
4518+ return stbi__parse_zlib(a, parse_header);
4519+}
4520+
4521+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
4522+{
4523+ stbi__zbuf a;
4524+ char *p = (char *) stbi__malloc(initial_size);
4525+ if (p == NULL) return NULL;
4526+ a.zbuffer = (stbi_uc *) buffer;
4527+ a.zbuffer_end = (stbi_uc *) buffer + len;
4528+ if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
4529+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
4530+ return a.zout_start;
4531+ } else {
4532+ STBI_FREE(a.zout_start);
4533+ return NULL;
4534+ }
4535+}
4536+
4537+STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
4538+{
4539+ return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
4540+}
4541+
4542+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
4543+{
4544+ stbi__zbuf a;
4545+ char *p = (char *) stbi__malloc(initial_size);
4546+ if (p == NULL) return NULL;
4547+ a.zbuffer = (stbi_uc *) buffer;
4548+ a.zbuffer_end = (stbi_uc *) buffer + len;
4549+ if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
4550+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
4551+ return a.zout_start;
4552+ } else {
4553+ STBI_FREE(a.zout_start);
4554+ return NULL;
4555+ }
4556+}
4557+
4558+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
4559+{
4560+ stbi__zbuf a;
4561+ a.zbuffer = (stbi_uc *) ibuffer;
4562+ a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
4563+ if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
4564+ return (int) (a.zout - a.zout_start);
4565+ else
4566+ return -1;
4567+}
4568+
4569+STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
4570+{
4571+ stbi__zbuf a;
4572+ char *p = (char *) stbi__malloc(16384);
4573+ if (p == NULL) return NULL;
4574+ a.zbuffer = (stbi_uc *) buffer;
4575+ a.zbuffer_end = (stbi_uc *) buffer+len;
4576+ if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
4577+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
4578+ return a.zout_start;
4579+ } else {
4580+ STBI_FREE(a.zout_start);
4581+ return NULL;
4582+ }
4583+}
4584+
4585+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
4586+{
4587+ stbi__zbuf a;
4588+ a.zbuffer = (stbi_uc *) ibuffer;
4589+ a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
4590+ if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
4591+ return (int) (a.zout - a.zout_start);
4592+ else
4593+ return -1;
4594+}
4595+#endif
4596+
4597+// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18
4598+// simple implementation
4599+// - only 8-bit samples
4600+// - no CRC checking
4601+// - allocates lots of intermediate memory
4602+// - avoids problem of streaming data between subsystems
4603+// - avoids explicit window management
4604+// performance
4605+// - uses stb_zlib, a PD zlib implementation with fast huffman decoding
4606+
4607+#ifndef STBI_NO_PNG
4608+typedef struct
4609+{
4610+ stbi__uint32 length;
4611+ stbi__uint32 type;
4612+} stbi__pngchunk;
4613+
4614+static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
4615+{
4616+ stbi__pngchunk c;
4617+ c.length = stbi__get32be(s);
4618+ c.type = stbi__get32be(s);
4619+ return c;
4620+}
4621+
4622+static int stbi__check_png_header(stbi__context *s)
4623+{
4624+ static const stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 };
4625+ int i;
4626+ for (i=0; i < 8; ++i)
4627+ if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG");
4628+ return 1;
4629+}
4630+
4631+typedef struct
4632+{
4633+ stbi__context *s;
4634+ stbi_uc *idata, *expanded, *out;
4635+ int depth;
4636+} stbi__png;
4637+
4638+
4639+enum {
4640+ STBI__F_none=0,
4641+ STBI__F_sub=1,
4642+ STBI__F_up=2,
4643+ STBI__F_avg=3,
4644+ STBI__F_paeth=4,
4645+ // synthetic filter used for first scanline to avoid needing a dummy row of 0s
4646+ STBI__F_avg_first
4647+};
4648+
4649+static stbi_uc first_row_filter[5] =
4650+{
4651+ STBI__F_none,
4652+ STBI__F_sub,
4653+ STBI__F_none,
4654+ STBI__F_avg_first,
4655+ STBI__F_sub // Paeth with b=c=0 turns out to be equivalent to sub
4656+};
4657+
4658+static int stbi__paeth(int a, int b, int c)
4659+{
4660+ // This formulation looks very different from the reference in the PNG spec, but is
4661+ // actually equivalent and has favorable data dependencies and admits straightforward
4662+ // generation of branch-free code, which helps performance significantly.
4663+ int thresh = c*3 - (a + b);
4664+ int lo = a < b ? a : b;
4665+ int hi = a < b ? b : a;
4666+ int t0 = (hi <= thresh) ? lo : c;
4667+ int t1 = (thresh <= lo) ? hi : t0;
4668+ return t1;
4669+}
4670+
4671+static const stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 };
4672+
4673+// adds an extra all-255 alpha channel
4674+// dest == src is legal
4675+// img_n must be 1 or 3
4676+static void stbi__create_png_alpha_expand8(stbi_uc *dest, stbi_uc *src, stbi__uint32 x, int img_n)
4677+{
4678+ int i;
4679+ // must process data backwards since we allow dest==src
4680+ if (img_n == 1) {
4681+ for (i=x-1; i >= 0; --i) {
4682+ dest[i*2+1] = 255;
4683+ dest[i*2+0] = src[i];
4684+ }
4685+ } else {
4686+ STBI_ASSERT(img_n == 3);
4687+ for (i=x-1; i >= 0; --i) {
4688+ dest[i*4+3] = 255;
4689+ dest[i*4+2] = src[i*3+2];
4690+ dest[i*4+1] = src[i*3+1];
4691+ dest[i*4+0] = src[i*3+0];
4692+ }
4693+ }
4694+}
4695+
4696+// create the png data from post-deflated data
4697+static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color)
4698+{
4699+ int bytes = (depth == 16 ? 2 : 1);
4700+ stbi__context *s = a->s;
4701+ stbi__uint32 i,j,stride = x*out_n*bytes;
4702+ stbi__uint32 img_len, img_width_bytes;
4703+ stbi_uc *filter_buf;
4704+ int all_ok = 1;
4705+ int k;
4706+ int img_n = s->img_n; // copy it into a local for later
4707+
4708+ int output_bytes = out_n*bytes;
4709+ int filter_bytes = img_n*bytes;
4710+ int width = x;
4711+
4712+ STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1);
4713+ a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into
4714+ if (!a->out) return stbi__err("outofmem", "Out of memory");
4715+
4716+ // note: error exits here don't need to clean up a->out individually,
4717+ // stbi__do_png always does on error.
4718+ if (!stbi__mad3sizes_valid(img_n, x, depth, 7)) return stbi__err("too large", "Corrupt PNG");
4719+ img_width_bytes = (((img_n * x * depth) + 7) >> 3);
4720+ if (!stbi__mad2sizes_valid(img_width_bytes, y, img_width_bytes)) return stbi__err("too large", "Corrupt PNG");
4721+ img_len = (img_width_bytes + 1) * y;
4722+
4723+ // we used to check for exact match between raw_len and img_len on non-interlaced PNGs,
4724+ // but issue #276 reported a PNG in the wild that had extra data at the end (all zeros),
4725+ // so just check for raw_len < img_len always.
4726+ if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG");
4727+
4728+ // Allocate two scan lines worth of filter workspace buffer.
4729+ filter_buf = (stbi_uc *) stbi__malloc_mad2(img_width_bytes, 2, 0);
4730+ if (!filter_buf) return stbi__err("outofmem", "Out of memory");
4731+
4732+ // Filtering for low-bit-depth images
4733+ if (depth < 8) {
4734+ filter_bytes = 1;
4735+ width = img_width_bytes;
4736+ }
4737+
4738+ for (j=0; j < y; ++j) {
4739+ // cur/prior filter buffers alternate
4740+ stbi_uc *cur = filter_buf + (j & 1)*img_width_bytes;
4741+ stbi_uc *prior = filter_buf + (~j & 1)*img_width_bytes;
4742+ stbi_uc *dest = a->out + stride*j;
4743+ int nk = width * filter_bytes;
4744+ int filter = *raw++;
4745+
4746+ // check filter type
4747+ if (filter > 4) {
4748+ all_ok = stbi__err("invalid filter","Corrupt PNG");
4749+ break;
4750+ }
4751+
4752+ // if first row, use special filter that doesn't sample previous row
4753+ if (j == 0) filter = first_row_filter[filter];
4754+
4755+ // perform actual filtering
4756+ switch (filter) {
4757+ case STBI__F_none:
4758+ memcpy(cur, raw, nk);
4759+ break;
4760+ case STBI__F_sub:
4761+ memcpy(cur, raw, filter_bytes);
4762+ for (k = filter_bytes; k < nk; ++k)
4763+ cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]);
4764+ break;
4765+ case STBI__F_up:
4766+ for (k = 0; k < nk; ++k)
4767+ cur[k] = STBI__BYTECAST(raw[k] + prior[k]);
4768+ break;
4769+ case STBI__F_avg:
4770+ for (k = 0; k < filter_bytes; ++k)
4771+ cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1));
4772+ for (k = filter_bytes; k < nk; ++k)
4773+ cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1));
4774+ break;
4775+ case STBI__F_paeth:
4776+ for (k = 0; k < filter_bytes; ++k)
4777+ cur[k] = STBI__BYTECAST(raw[k] + prior[k]); // prior[k] == stbi__paeth(0,prior[k],0)
4778+ for (k = filter_bytes; k < nk; ++k)
4779+ cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes], prior[k], prior[k-filter_bytes]));
4780+ break;
4781+ case STBI__F_avg_first:
4782+ memcpy(cur, raw, filter_bytes);
4783+ for (k = filter_bytes; k < nk; ++k)
4784+ cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1));
4785+ break;
4786+ }
4787+
4788+ raw += nk;
4789+
4790+ // expand decoded bits in cur to dest, also adding an extra alpha channel if desired
4791+ if (depth < 8) {
4792+ stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range
4793+ stbi_uc *in = cur;
4794+ stbi_uc *out = dest;
4795+ stbi_uc inb = 0;
4796+ stbi__uint32 nsmp = x*img_n;
4797+
4798+ // expand bits to bytes first
4799+ if (depth == 4) {
4800+ for (i=0; i < nsmp; ++i) {
4801+ if ((i & 1) == 0) inb = *in++;
4802+ *out++ = scale * (inb >> 4);
4803+ inb <<= 4;
4804+ }
4805+ } else if (depth == 2) {
4806+ for (i=0; i < nsmp; ++i) {
4807+ if ((i & 3) == 0) inb = *in++;
4808+ *out++ = scale * (inb >> 6);
4809+ inb <<= 2;
4810+ }
4811+ } else {
4812+ STBI_ASSERT(depth == 1);
4813+ for (i=0; i < nsmp; ++i) {
4814+ if ((i & 7) == 0) inb = *in++;
4815+ *out++ = scale * (inb >> 7);
4816+ inb <<= 1;
4817+ }
4818+ }
4819+
4820+ // insert alpha=255 values if desired
4821+ if (img_n != out_n)
4822+ stbi__create_png_alpha_expand8(dest, dest, x, img_n);
4823+ } else if (depth == 8) {
4824+ if (img_n == out_n)
4825+ memcpy(dest, cur, x*img_n);
4826+ else
4827+ stbi__create_png_alpha_expand8(dest, cur, x, img_n);
4828+ } else if (depth == 16) {
4829+ // convert the image data from big-endian to platform-native
4830+ stbi__uint16 *dest16 = (stbi__uint16*)dest;
4831+ stbi__uint32 nsmp = x*img_n;
4832+
4833+ if (img_n == out_n) {
4834+ for (i = 0; i < nsmp; ++i, ++dest16, cur += 2)
4835+ *dest16 = (cur[0] << 8) | cur[1];
4836+ } else {
4837+ STBI_ASSERT(img_n+1 == out_n);
4838+ if (img_n == 1) {
4839+ for (i = 0; i < x; ++i, dest16 += 2, cur += 2) {
4840+ dest16[0] = (cur[0] << 8) | cur[1];
4841+ dest16[1] = 0xffff;
4842+ }
4843+ } else {
4844+ STBI_ASSERT(img_n == 3);
4845+ for (i = 0; i < x; ++i, dest16 += 4, cur += 6) {
4846+ dest16[0] = (cur[0] << 8) | cur[1];
4847+ dest16[1] = (cur[2] << 8) | cur[3];
4848+ dest16[2] = (cur[4] << 8) | cur[5];
4849+ dest16[3] = 0xffff;
4850+ }
4851+ }
4852+ }
4853+ }
4854+ }
4855+
4856+ STBI_FREE(filter_buf);
4857+ if (!all_ok) return 0;
4858+
4859+ return 1;
4860+}
4861+
4862+static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced)
4863+{
4864+ int bytes = (depth == 16 ? 2 : 1);
4865+ int out_bytes = out_n * bytes;
4866+ stbi_uc *final;
4867+ int p;
4868+ if (!interlaced)
4869+ return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color);
4870+
4871+ // de-interlacing
4872+ final = (stbi_uc *) stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0);
4873+ if (!final) return stbi__err("outofmem", "Out of memory");
4874+ for (p=0; p < 7; ++p) {
4875+ int xorig[] = { 0,4,0,2,0,1,0 };
4876+ int yorig[] = { 0,0,4,0,2,0,1 };
4877+ int xspc[] = { 8,8,4,4,2,2,1 };
4878+ int yspc[] = { 8,8,8,4,4,2,2 };
4879+ int i,j,x,y;
4880+ // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
4881+ x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p];
4882+ y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p];
4883+ if (x && y) {
4884+ stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
4885+ if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) {
4886+ STBI_FREE(final);
4887+ return 0;
4888+ }
4889+ for (j=0; j < y; ++j) {
4890+ for (i=0; i < x; ++i) {
4891+ int out_y = j*yspc[p]+yorig[p];
4892+ int out_x = i*xspc[p]+xorig[p];
4893+ memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes,
4894+ a->out + (j*x+i)*out_bytes, out_bytes);
4895+ }
4896+ }
4897+ STBI_FREE(a->out);
4898+ image_data += img_len;
4899+ image_data_len -= img_len;
4900+ }
4901+ }
4902+ a->out = final;
4903+
4904+ return 1;
4905+}
4906+
4907+static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n)
4908+{
4909+ stbi__context *s = z->s;
4910+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
4911+ stbi_uc *p = z->out;
4912+
4913+ // compute color-based transparency, assuming we've
4914+ // already got 255 as the alpha value in the output
4915+ STBI_ASSERT(out_n == 2 || out_n == 4);
4916+
4917+ if (out_n == 2) {
4918+ for (i=0; i < pixel_count; ++i) {
4919+ p[1] = (p[0] == tc[0] ? 0 : 255);
4920+ p += 2;
4921+ }
4922+ } else {
4923+ for (i=0; i < pixel_count; ++i) {
4924+ if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
4925+ p[3] = 0;
4926+ p += 4;
4927+ }
4928+ }
4929+ return 1;
4930+}
4931+
4932+static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n)
4933+{
4934+ stbi__context *s = z->s;
4935+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
4936+ stbi__uint16 *p = (stbi__uint16*) z->out;
4937+
4938+ // compute color-based transparency, assuming we've
4939+ // already got 65535 as the alpha value in the output
4940+ STBI_ASSERT(out_n == 2 || out_n == 4);
4941+
4942+ if (out_n == 2) {
4943+ for (i = 0; i < pixel_count; ++i) {
4944+ p[1] = (p[0] == tc[0] ? 0 : 65535);
4945+ p += 2;
4946+ }
4947+ } else {
4948+ for (i = 0; i < pixel_count; ++i) {
4949+ if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
4950+ p[3] = 0;
4951+ p += 4;
4952+ }
4953+ }
4954+ return 1;
4955+}
4956+
4957+static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n)
4958+{
4959+ stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
4960+ stbi_uc *p, *temp_out, *orig = a->out;
4961+
4962+ p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0);
4963+ if (p == NULL) return stbi__err("outofmem", "Out of memory");
4964+
4965+ // between here and free(out) below, exitting would leak
4966+ temp_out = p;
4967+
4968+ if (pal_img_n == 3) {
4969+ for (i=0; i < pixel_count; ++i) {
4970+ int n = orig[i]*4;
4971+ p[0] = palette[n ];
4972+ p[1] = palette[n+1];
4973+ p[2] = palette[n+2];
4974+ p += 3;
4975+ }
4976+ } else {
4977+ for (i=0; i < pixel_count; ++i) {
4978+ int n = orig[i]*4;
4979+ p[0] = palette[n ];
4980+ p[1] = palette[n+1];
4981+ p[2] = palette[n+2];
4982+ p[3] = palette[n+3];
4983+ p += 4;
4984+ }
4985+ }
4986+ STBI_FREE(a->out);
4987+ a->out = temp_out;
4988+
4989+ STBI_NOTUSED(len);
4990+
4991+ return 1;
4992+}
4993+
4994+static int stbi__unpremultiply_on_load_global = 0;
4995+static int stbi__de_iphone_flag_global = 0;
4996+
4997+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
4998+{
4999+ stbi__unpremultiply_on_load_global = flag_true_if_should_unpremultiply;
5000+}
5001+
5002+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
5003+{
5004+ stbi__de_iphone_flag_global = flag_true_if_should_convert;
5005+}
5006+
5007+#ifndef STBI_THREAD_LOCAL
5008+#define stbi__unpremultiply_on_load stbi__unpremultiply_on_load_global
5009+#define stbi__de_iphone_flag stbi__de_iphone_flag_global
5010+#else
5011+static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set;
5012+static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set;
5013+
5014+STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply)
5015+{
5016+ stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply;
5017+ stbi__unpremultiply_on_load_set = 1;
5018+}
5019+
5020+STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert)
5021+{
5022+ stbi__de_iphone_flag_local = flag_true_if_should_convert;
5023+ stbi__de_iphone_flag_set = 1;
5024+}
5025+
5026+#define stbi__unpremultiply_on_load (stbi__unpremultiply_on_load_set \
5027+ ? stbi__unpremultiply_on_load_local \
5028+ : stbi__unpremultiply_on_load_global)
5029+#define stbi__de_iphone_flag (stbi__de_iphone_flag_set \
5030+ ? stbi__de_iphone_flag_local \
5031+ : stbi__de_iphone_flag_global)
5032+#endif // STBI_THREAD_LOCAL
5033+
5034+static void stbi__de_iphone(stbi__png *z)
5035+{
5036+ stbi__context *s = z->s;
5037+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
5038+ stbi_uc *p = z->out;
5039+
5040+ if (s->img_out_n == 3) { // convert bgr to rgb
5041+ for (i=0; i < pixel_count; ++i) {
5042+ stbi_uc t = p[0];
5043+ p[0] = p[2];
5044+ p[2] = t;
5045+ p += 3;
5046+ }
5047+ } else {
5048+ STBI_ASSERT(s->img_out_n == 4);
5049+ if (stbi__unpremultiply_on_load) {
5050+ // convert bgr to rgb and unpremultiply
5051+ for (i=0; i < pixel_count; ++i) {
5052+ stbi_uc a = p[3];
5053+ stbi_uc t = p[0];
5054+ if (a) {
5055+ stbi_uc half = a / 2;
5056+ p[0] = (p[2] * 255 + half) / a;
5057+ p[1] = (p[1] * 255 + half) / a;
5058+ p[2] = ( t * 255 + half) / a;
5059+ } else {
5060+ p[0] = p[2];
5061+ p[2] = t;
5062+ }
5063+ p += 4;
5064+ }
5065+ } else {
5066+ // convert bgr to rgb
5067+ for (i=0; i < pixel_count; ++i) {
5068+ stbi_uc t = p[0];
5069+ p[0] = p[2];
5070+ p[2] = t;
5071+ p += 4;
5072+ }
5073+ }
5074+ }
5075+}
5076+
5077+#define STBI__PNG_TYPE(a,b,c,d) (((unsigned) (a) << 24) + ((unsigned) (b) << 16) + ((unsigned) (c) << 8) + (unsigned) (d))
5078+
5079+static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
5080+{
5081+ stbi_uc palette[1024], pal_img_n=0;
5082+ stbi_uc has_trans=0, tc[3]={0};
5083+ stbi__uint16 tc16[3];
5084+ stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
5085+ int first=1,k,interlace=0, color=0, is_iphone=0;
5086+ stbi__context *s = z->s;
5087+
5088+ z->expanded = NULL;
5089+ z->idata = NULL;
5090+ z->out = NULL;
5091+
5092+ if (!stbi__check_png_header(s)) return 0;
5093+
5094+ if (scan == STBI__SCAN_type) return 1;
5095+
5096+ for (;;) {
5097+ stbi__pngchunk c = stbi__get_chunk_header(s);
5098+ switch (c.type) {
5099+ case STBI__PNG_TYPE('C','g','B','I'):
5100+ is_iphone = 1;
5101+ stbi__skip(s, c.length);
5102+ break;
5103+ case STBI__PNG_TYPE('I','H','D','R'): {
5104+ int comp,filter;
5105+ if (!first) return stbi__err("multiple IHDR","Corrupt PNG");
5106+ first = 0;
5107+ if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG");
5108+ s->img_x = stbi__get32be(s);
5109+ s->img_y = stbi__get32be(s);
5110+ if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
5111+ if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
5112+ z->depth = stbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only");
5113+ color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG");
5114+ if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG");
5115+ if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG");
5116+ comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG");
5117+ filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG");
5118+ interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG");
5119+ if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG");
5120+ if (!pal_img_n) {
5121+ s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
5122+ if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
5123+ } else {
5124+ // if paletted, then pal_n is our final components, and
5125+ // img_n is # components to decompress/filter.
5126+ s->img_n = 1;
5127+ if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
5128+ }
5129+ // even with SCAN_header, have to scan to see if we have a tRNS
5130+ break;
5131+ }
5132+
5133+ case STBI__PNG_TYPE('P','L','T','E'): {
5134+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
5135+ if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG");
5136+ pal_len = c.length / 3;
5137+ if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG");
5138+ for (i=0; i < pal_len; ++i) {
5139+ palette[i*4+0] = stbi__get8(s);
5140+ palette[i*4+1] = stbi__get8(s);
5141+ palette[i*4+2] = stbi__get8(s);
5142+ palette[i*4+3] = 255;
5143+ }
5144+ break;
5145+ }
5146+
5147+ case STBI__PNG_TYPE('t','R','N','S'): {
5148+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
5149+ if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG");
5150+ if (pal_img_n) {
5151+ if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; }
5152+ if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG");
5153+ if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG");
5154+ pal_img_n = 4;
5155+ for (i=0; i < c.length; ++i)
5156+ palette[i*4+3] = stbi__get8(s);
5157+ } else {
5158+ if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
5159+ if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
5160+ has_trans = 1;
5161+ // non-paletted with tRNS = constant alpha. if header-scanning, we can stop now.
5162+ if (scan == STBI__SCAN_header) { ++s->img_n; return 1; }
5163+ if (z->depth == 16) {
5164+ for (k = 0; k < s->img_n && k < 3; ++k) // extra loop test to suppress false GCC warning
5165+ tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
5166+ } else {
5167+ for (k = 0; k < s->img_n && k < 3; ++k)
5168+ tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
5169+ }
5170+ }
5171+ break;
5172+ }
5173+
5174+ case STBI__PNG_TYPE('I','D','A','T'): {
5175+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
5176+ if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
5177+ if (scan == STBI__SCAN_header) {
5178+ // header scan definitely stops at first IDAT
5179+ if (pal_img_n)
5180+ s->img_n = pal_img_n;
5181+ return 1;
5182+ }
5183+ if (c.length > (1u << 30)) return stbi__err("IDAT size limit", "IDAT section larger than 2^30 bytes");
5184+ if ((int)(ioff + c.length) < (int)ioff) return 0;
5185+ if (ioff + c.length > idata_limit) {
5186+ stbi__uint32 idata_limit_old = idata_limit;
5187+ stbi_uc *p;
5188+ if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
5189+ while (ioff + c.length > idata_limit)
5190+ idata_limit *= 2;
5191+ STBI_NOTUSED(idata_limit_old);
5192+ p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory");
5193+ z->idata = p;
5194+ }
5195+ if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG");
5196+ ioff += c.length;
5197+ break;
5198+ }
5199+
5200+ case STBI__PNG_TYPE('I','E','N','D'): {
5201+ stbi__uint32 raw_len, bpl;
5202+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
5203+ if (scan != STBI__SCAN_load) return 1;
5204+ if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG");
5205+ // initial guess for decoded data size to avoid unnecessary reallocs
5206+ bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component
5207+ raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
5208+ z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone);
5209+ if (z->expanded == NULL) return 0; // zlib should set error
5210+ STBI_FREE(z->idata); z->idata = NULL;
5211+ if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
5212+ s->img_out_n = s->img_n+1;
5213+ else
5214+ s->img_out_n = s->img_n;
5215+ if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0;
5216+ if (has_trans) {
5217+ if (z->depth == 16) {
5218+ if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0;
5219+ } else {
5220+ if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
5221+ }
5222+ }
5223+ if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
5224+ stbi__de_iphone(z);
5225+ if (pal_img_n) {
5226+ // pal_img_n == 3 or 4
5227+ s->img_n = pal_img_n; // record the actual colors we had
5228+ s->img_out_n = pal_img_n;
5229+ if (req_comp >= 3) s->img_out_n = req_comp;
5230+ if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
5231+ return 0;
5232+ } else if (has_trans) {
5233+ // non-paletted image with tRNS -> source image has (constant) alpha
5234+ ++s->img_n;
5235+ }
5236+ STBI_FREE(z->expanded); z->expanded = NULL;
5237+ // end of PNG chunk, read and skip CRC
5238+ stbi__get32be(s);
5239+ return 1;
5240+ }
5241+
5242+ default:
5243+ // if critical, fail
5244+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
5245+ if ((c.type & (1 << 29)) == 0) {
5246+ #ifndef STBI_NO_FAILURE_STRINGS
5247+ // not threadsafe
5248+ static char invalid_chunk[] = "XXXX PNG chunk not known";
5249+ invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
5250+ invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
5251+ invalid_chunk[2] = STBI__BYTECAST(c.type >> 8);
5252+ invalid_chunk[3] = STBI__BYTECAST(c.type >> 0);
5253+ #endif
5254+ return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
5255+ }
5256+ stbi__skip(s, c.length);
5257+ break;
5258+ }
5259+ // end of PNG chunk, read and skip CRC
5260+ stbi__get32be(s);
5261+ }
5262+}
5263+
5264+static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri)
5265+{
5266+ void *result=NULL;
5267+ if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
5268+ if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
5269+ if (p->depth <= 8)
5270+ ri->bits_per_channel = 8;
5271+ else if (p->depth == 16)
5272+ ri->bits_per_channel = 16;
5273+ else
5274+ return stbi__errpuc("bad bits_per_channel", "PNG not supported: unsupported color depth");
5275+ result = p->out;
5276+ p->out = NULL;
5277+ if (req_comp && req_comp != p->s->img_out_n) {
5278+ if (ri->bits_per_channel == 8)
5279+ result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
5280+ else
5281+ result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
5282+ p->s->img_out_n = req_comp;
5283+ if (result == NULL) return result;
5284+ }
5285+ *x = p->s->img_x;
5286+ *y = p->s->img_y;
5287+ if (n) *n = p->s->img_n;
5288+ }
5289+ STBI_FREE(p->out); p->out = NULL;
5290+ STBI_FREE(p->expanded); p->expanded = NULL;
5291+ STBI_FREE(p->idata); p->idata = NULL;
5292+
5293+ return result;
5294+}
5295+
5296+static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
5297+{
5298+ stbi__png p;
5299+ p.s = s;
5300+ return stbi__do_png(&p, x,y,comp,req_comp, ri);
5301+}
5302+
5303+static int stbi__png_test(stbi__context *s)
5304+{
5305+ int r;
5306+ r = stbi__check_png_header(s);
5307+ stbi__rewind(s);
5308+ return r;
5309+}
5310+
5311+static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
5312+{
5313+ if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
5314+ stbi__rewind( p->s );
5315+ return 0;
5316+ }
5317+ if (x) *x = p->s->img_x;
5318+ if (y) *y = p->s->img_y;
5319+ if (comp) *comp = p->s->img_n;
5320+ return 1;
5321+}
5322+
5323+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
5324+{
5325+ stbi__png p;
5326+ p.s = s;
5327+ return stbi__png_info_raw(&p, x, y, comp);
5328+}
5329+
5330+static int stbi__png_is16(stbi__context *s)
5331+{
5332+ stbi__png p;
5333+ p.s = s;
5334+ if (!stbi__png_info_raw(&p, NULL, NULL, NULL))
5335+ return 0;
5336+ if (p.depth != 16) {
5337+ stbi__rewind(p.s);
5338+ return 0;
5339+ }
5340+ return 1;
5341+}
5342+#endif
5343+
5344+// Microsoft/Windows BMP image
5345+
5346+#ifndef STBI_NO_BMP
5347+static int stbi__bmp_test_raw(stbi__context *s)
5348+{
5349+ int r;
5350+ int sz;
5351+ if (stbi__get8(s) != 'B') return 0;
5352+ if (stbi__get8(s) != 'M') return 0;
5353+ stbi__get32le(s); // discard filesize
5354+ stbi__get16le(s); // discard reserved
5355+ stbi__get16le(s); // discard reserved
5356+ stbi__get32le(s); // discard data offset
5357+ sz = stbi__get32le(s);
5358+ r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
5359+ return r;
5360+}
5361+
5362+static int stbi__bmp_test(stbi__context *s)
5363+{
5364+ int r = stbi__bmp_test_raw(s);
5365+ stbi__rewind(s);
5366+ return r;
5367+}
5368+
5369+
5370+// returns 0..31 for the highest set bit
5371+static int stbi__high_bit(unsigned int z)
5372+{
5373+ int n=0;
5374+ if (z == 0) return -1;
5375+ if (z >= 0x10000) { n += 16; z >>= 16; }
5376+ if (z >= 0x00100) { n += 8; z >>= 8; }
5377+ if (z >= 0x00010) { n += 4; z >>= 4; }
5378+ if (z >= 0x00004) { n += 2; z >>= 2; }
5379+ if (z >= 0x00002) { n += 1;/* >>= 1;*/ }
5380+ return n;
5381+}
5382+
5383+static int stbi__bitcount(unsigned int a)
5384+{
5385+ a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
5386+ a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
5387+ a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
5388+ a = (a + (a >> 8)); // max 16 per 8 bits
5389+ a = (a + (a >> 16)); // max 32 per 8 bits
5390+ return a & 0xff;
5391+}
5392+
5393+// extract an arbitrarily-aligned N-bit value (N=bits)
5394+// from v, and then make it 8-bits long and fractionally
5395+// extend it to full full range.
5396+static int stbi__shiftsigned(unsigned int v, int shift, int bits)
5397+{
5398+ static unsigned int mul_table[9] = {
5399+ 0,
5400+ 0xff/*0b11111111*/, 0x55/*0b01010101*/, 0x49/*0b01001001*/, 0x11/*0b00010001*/,
5401+ 0x21/*0b00100001*/, 0x41/*0b01000001*/, 0x81/*0b10000001*/, 0x01/*0b00000001*/,
5402+ };
5403+ static unsigned int shift_table[9] = {
5404+ 0, 0,0,1,0,2,4,6,0,
5405+ };
5406+ if (shift < 0)
5407+ v <<= -shift;
5408+ else
5409+ v >>= shift;
5410+ STBI_ASSERT(v < 256);
5411+ v >>= (8-bits);
5412+ STBI_ASSERT(bits >= 0 && bits <= 8);
5413+ return (int) ((unsigned) v * mul_table[bits]) >> shift_table[bits];
5414+}
5415+
5416+typedef struct
5417+{
5418+ int bpp, offset, hsz;
5419+ unsigned int mr,mg,mb,ma, all_a;
5420+ int extra_read;
5421+} stbi__bmp_data;
5422+
5423+static int stbi__bmp_set_mask_defaults(stbi__bmp_data *info, int compress)
5424+{
5425+ // BI_BITFIELDS specifies masks explicitly, don't override
5426+ if (compress == 3)
5427+ return 1;
5428+
5429+ if (compress == 0) {
5430+ if (info->bpp == 16) {
5431+ info->mr = 31u << 10;
5432+ info->mg = 31u << 5;
5433+ info->mb = 31u << 0;
5434+ } else if (info->bpp == 32) {
5435+ info->mr = 0xffu << 16;
5436+ info->mg = 0xffu << 8;
5437+ info->mb = 0xffu << 0;
5438+ info->ma = 0xffu << 24;
5439+ info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0
5440+ } else {
5441+ // otherwise, use defaults, which is all-0
5442+ info->mr = info->mg = info->mb = info->ma = 0;
5443+ }
5444+ return 1;
5445+ }
5446+ return 0; // error
5447+}
5448+
5449+static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info)
5450+{
5451+ int hsz;
5452+ if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
5453+ stbi__get32le(s); // discard filesize
5454+ stbi__get16le(s); // discard reserved
5455+ stbi__get16le(s); // discard reserved
5456+ info->offset = stbi__get32le(s);
5457+ info->hsz = hsz = stbi__get32le(s);
5458+ info->mr = info->mg = info->mb = info->ma = 0;
5459+ info->extra_read = 14;
5460+
5461+ if (info->offset < 0) return stbi__errpuc("bad BMP", "bad BMP");
5462+
5463+ if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
5464+ if (hsz == 12) {
5465+ s->img_x = stbi__get16le(s);
5466+ s->img_y = stbi__get16le(s);
5467+ } else {
5468+ s->img_x = stbi__get32le(s);
5469+ s->img_y = stbi__get32le(s);
5470+ }
5471+ if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
5472+ info->bpp = stbi__get16le(s);
5473+ if (hsz != 12) {
5474+ int compress = stbi__get32le(s);
5475+ if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
5476+ if (compress >= 4) return stbi__errpuc("BMP JPEG/PNG", "BMP type not supported: unsupported compression"); // this includes PNG/JPEG modes
5477+ if (compress == 3 && info->bpp != 16 && info->bpp != 32) return stbi__errpuc("bad BMP", "bad BMP"); // bitfields requires 16 or 32 bits/pixel
5478+ stbi__get32le(s); // discard sizeof
5479+ stbi__get32le(s); // discard hres
5480+ stbi__get32le(s); // discard vres
5481+ stbi__get32le(s); // discard colorsused
5482+ stbi__get32le(s); // discard max important
5483+ if (hsz == 40 || hsz == 56) {
5484+ if (hsz == 56) {
5485+ stbi__get32le(s);
5486+ stbi__get32le(s);
5487+ stbi__get32le(s);
5488+ stbi__get32le(s);
5489+ }
5490+ if (info->bpp == 16 || info->bpp == 32) {
5491+ if (compress == 0) {
5492+ stbi__bmp_set_mask_defaults(info, compress);
5493+ } else if (compress == 3) {
5494+ info->mr = stbi__get32le(s);
5495+ info->mg = stbi__get32le(s);
5496+ info->mb = stbi__get32le(s);
5497+ info->extra_read += 12;
5498+ // not documented, but generated by photoshop and handled by mspaint
5499+ if (info->mr == info->mg && info->mg == info->mb) {
5500+ // ?!?!?
5501+ return stbi__errpuc("bad BMP", "bad BMP");
5502+ }
5503+ } else
5504+ return stbi__errpuc("bad BMP", "bad BMP");
5505+ }
5506+ } else {
5507+ // V4/V5 header
5508+ int i;
5509+ if (hsz != 108 && hsz != 124)
5510+ return stbi__errpuc("bad BMP", "bad BMP");
5511+ info->mr = stbi__get32le(s);
5512+ info->mg = stbi__get32le(s);
5513+ info->mb = stbi__get32le(s);
5514+ info->ma = stbi__get32le(s);
5515+ if (compress != 3) // override mr/mg/mb unless in BI_BITFIELDS mode, as per docs
5516+ stbi__bmp_set_mask_defaults(info, compress);
5517+ stbi__get32le(s); // discard color space
5518+ for (i=0; i < 12; ++i)
5519+ stbi__get32le(s); // discard color space parameters
5520+ if (hsz == 124) {
5521+ stbi__get32le(s); // discard rendering intent
5522+ stbi__get32le(s); // discard offset of profile data
5523+ stbi__get32le(s); // discard size of profile data
5524+ stbi__get32le(s); // discard reserved
5525+ }
5526+ }
5527+ }
5528+ return (void *) 1;
5529+}
5530+
5531+
5532+static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
5533+{
5534+ stbi_uc *out;
5535+ unsigned int mr=0,mg=0,mb=0,ma=0, all_a;
5536+ stbi_uc pal[256][4];
5537+ int psize=0,i,j,width;
5538+ int flip_vertically, pad, target;
5539+ stbi__bmp_data info;
5540+ STBI_NOTUSED(ri);
5541+
5542+ info.all_a = 255;
5543+ if (stbi__bmp_parse_header(s, &info) == NULL)
5544+ return NULL; // error code already set
5545+
5546+ flip_vertically = ((int) s->img_y) > 0;
5547+ s->img_y = abs((int) s->img_y);
5548+
5549+ if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
5550+ if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
5551+
5552+ mr = info.mr;
5553+ mg = info.mg;
5554+ mb = info.mb;
5555+ ma = info.ma;
5556+ all_a = info.all_a;
5557+
5558+ if (info.hsz == 12) {
5559+ if (info.bpp < 24)
5560+ psize = (info.offset - info.extra_read - 24) / 3;
5561+ } else {
5562+ if (info.bpp < 16)
5563+ psize = (info.offset - info.extra_read - info.hsz) >> 2;
5564+ }
5565+ if (psize == 0) {
5566+ // accept some number of extra bytes after the header, but if the offset points either to before
5567+ // the header ends or implies a large amount of extra data, reject the file as malformed
5568+ int bytes_read_so_far = s->callback_already_read + (int)(s->img_buffer - s->img_buffer_original);
5569+ int header_limit = 1024; // max we actually read is below 256 bytes currently.
5570+ int extra_data_limit = 256*4; // what ordinarily goes here is a palette; 256 entries*4 bytes is its max size.
5571+ if (bytes_read_so_far <= 0 || bytes_read_so_far > header_limit) {
5572+ return stbi__errpuc("bad header", "Corrupt BMP");
5573+ }
5574+ // we established that bytes_read_so_far is positive and sensible.
5575+ // the first half of this test rejects offsets that are either too small positives, or
5576+ // negative, and guarantees that info.offset >= bytes_read_so_far > 0. this in turn
5577+ // ensures the number computed in the second half of the test can't overflow.
5578+ if (info.offset < bytes_read_so_far || info.offset - bytes_read_so_far > extra_data_limit) {
5579+ return stbi__errpuc("bad offset", "Corrupt BMP");
5580+ } else {
5581+ stbi__skip(s, info.offset - bytes_read_so_far);
5582+ }
5583+ }
5584+
5585+ if (info.bpp == 24 && ma == 0xff000000)
5586+ s->img_n = 3;
5587+ else
5588+ s->img_n = ma ? 4 : 3;
5589+ if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
5590+ target = req_comp;
5591+ else
5592+ target = s->img_n; // if they want monochrome, we'll post-convert
5593+
5594+ // sanity-check size
5595+ if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0))
5596+ return stbi__errpuc("too large", "Corrupt BMP");
5597+
5598+ out = (stbi_uc *) stbi__malloc_mad3(target, s->img_x, s->img_y, 0);
5599+ if (!out) return stbi__errpuc("outofmem", "Out of memory");
5600+ if (info.bpp < 16) {
5601+ int z=0;
5602+ if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); }
5603+ for (i=0; i < psize; ++i) {
5604+ pal[i][2] = stbi__get8(s);
5605+ pal[i][1] = stbi__get8(s);
5606+ pal[i][0] = stbi__get8(s);
5607+ if (info.hsz != 12) stbi__get8(s);
5608+ pal[i][3] = 255;
5609+ }
5610+ stbi__skip(s, info.offset - info.extra_read - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
5611+ if (info.bpp == 1) width = (s->img_x + 7) >> 3;
5612+ else if (info.bpp == 4) width = (s->img_x + 1) >> 1;
5613+ else if (info.bpp == 8) width = s->img_x;
5614+ else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); }
5615+ pad = (-width)&3;
5616+ if (info.bpp == 1) {
5617+ for (j=0; j < (int) s->img_y; ++j) {
5618+ int bit_offset = 7, v = stbi__get8(s);
5619+ for (i=0; i < (int) s->img_x; ++i) {
5620+ int color = (v>>bit_offset)&0x1;
5621+ out[z++] = pal[color][0];
5622+ out[z++] = pal[color][1];
5623+ out[z++] = pal[color][2];
5624+ if (target == 4) out[z++] = 255;
5625+ if (i+1 == (int) s->img_x) break;
5626+ if((--bit_offset) < 0) {
5627+ bit_offset = 7;
5628+ v = stbi__get8(s);
5629+ }
5630+ }
5631+ stbi__skip(s, pad);
5632+ }
5633+ } else {
5634+ for (j=0; j < (int) s->img_y; ++j) {
5635+ for (i=0; i < (int) s->img_x; i += 2) {
5636+ int v=stbi__get8(s),v2=0;
5637+ if (info.bpp == 4) {
5638+ v2 = v & 15;
5639+ v >>= 4;
5640+ }
5641+ out[z++] = pal[v][0];
5642+ out[z++] = pal[v][1];
5643+ out[z++] = pal[v][2];
5644+ if (target == 4) out[z++] = 255;
5645+ if (i+1 == (int) s->img_x) break;
5646+ v = (info.bpp == 8) ? stbi__get8(s) : v2;
5647+ out[z++] = pal[v][0];
5648+ out[z++] = pal[v][1];
5649+ out[z++] = pal[v][2];
5650+ if (target == 4) out[z++] = 255;
5651+ }
5652+ stbi__skip(s, pad);
5653+ }
5654+ }
5655+ } else {
5656+ int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
5657+ int z = 0;
5658+ int easy=0;
5659+ stbi__skip(s, info.offset - info.extra_read - info.hsz);
5660+ if (info.bpp == 24) width = 3 * s->img_x;
5661+ else if (info.bpp == 16) width = 2*s->img_x;
5662+ else /* bpp = 32 and pad = 0 */ width=0;
5663+ pad = (-width) & 3;
5664+ if (info.bpp == 24) {
5665+ easy = 1;
5666+ } else if (info.bpp == 32) {
5667+ if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
5668+ easy = 2;
5669+ }
5670+ if (!easy) {
5671+ if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
5672+ // right shift amt to put high bit in position #7
5673+ rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr);
5674+ gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg);
5675+ bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb);
5676+ ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma);
5677+ if (rcount > 8 || gcount > 8 || bcount > 8 || acount > 8) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
5678+ }
5679+ for (j=0; j < (int) s->img_y; ++j) {
5680+ if (easy) {
5681+ for (i=0; i < (int) s->img_x; ++i) {
5682+ unsigned char a;
5683+ out[z+2] = stbi__get8(s);
5684+ out[z+1] = stbi__get8(s);
5685+ out[z+0] = stbi__get8(s);
5686+ z += 3;
5687+ a = (easy == 2 ? stbi__get8(s) : 255);
5688+ all_a |= a;
5689+ if (target == 4) out[z++] = a;
5690+ }
5691+ } else {
5692+ int bpp = info.bpp;
5693+ for (i=0; i < (int) s->img_x; ++i) {
5694+ stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s));
5695+ unsigned int a;
5696+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
5697+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
5698+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
5699+ a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
5700+ all_a |= a;
5701+ if (target == 4) out[z++] = STBI__BYTECAST(a);
5702+ }
5703+ }
5704+ stbi__skip(s, pad);
5705+ }
5706+ }
5707+
5708+ // if alpha channel is all 0s, replace with all 255s
5709+ if (target == 4 && all_a == 0)
5710+ for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4)
5711+ out[i] = 255;
5712+
5713+ if (flip_vertically) {
5714+ stbi_uc t;
5715+ for (j=0; j < (int) s->img_y>>1; ++j) {
5716+ stbi_uc *p1 = out + j *s->img_x*target;
5717+ stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
5718+ for (i=0; i < (int) s->img_x*target; ++i) {
5719+ t = p1[i]; p1[i] = p2[i]; p2[i] = t;
5720+ }
5721+ }
5722+ }
5723+
5724+ if (req_comp && req_comp != target) {
5725+ out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
5726+ if (out == NULL) return out; // stbi__convert_format frees input on failure
5727+ }
5728+
5729+ *x = s->img_x;
5730+ *y = s->img_y;
5731+ if (comp) *comp = s->img_n;
5732+ return out;
5733+}
5734+#endif
5735+
5736+// Targa Truevision - TGA
5737+// by Jonathan Dummer
5738+#ifndef STBI_NO_TGA
5739+// returns STBI_rgb or whatever, 0 on error
5740+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16)
5741+{
5742+ // only RGB or RGBA (incl. 16bit) or grey allowed
5743+ if (is_rgb16) *is_rgb16 = 0;
5744+ switch(bits_per_pixel) {
5745+ case 8: return STBI_grey;
5746+ case 16: if(is_grey) return STBI_grey_alpha;
5747+ // fallthrough
5748+ case 15: if(is_rgb16) *is_rgb16 = 1;
5749+ return STBI_rgb;
5750+ case 24: // fallthrough
5751+ case 32: return bits_per_pixel/8;
5752+ default: return 0;
5753+ }
5754+}
5755+
5756+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
5757+{
5758+ int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
5759+ int sz, tga_colormap_type;
5760+ stbi__get8(s); // discard Offset
5761+ tga_colormap_type = stbi__get8(s); // colormap type
5762+ if( tga_colormap_type > 1 ) {
5763+ stbi__rewind(s);
5764+ return 0; // only RGB or indexed allowed
5765+ }
5766+ tga_image_type = stbi__get8(s); // image type
5767+ if ( tga_colormap_type == 1 ) { // colormapped (paletted) image
5768+ if (tga_image_type != 1 && tga_image_type != 9) {
5769+ stbi__rewind(s);
5770+ return 0;
5771+ }
5772+ stbi__skip(s,4); // skip index of first colormap entry and number of entries
5773+ sz = stbi__get8(s); // check bits per palette color entry
5774+ if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) {
5775+ stbi__rewind(s);
5776+ return 0;
5777+ }
5778+ stbi__skip(s,4); // skip image x and y origin
5779+ tga_colormap_bpp = sz;
5780+ } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE
5781+ if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) {
5782+ stbi__rewind(s);
5783+ return 0; // only RGB or grey allowed, +/- RLE
5784+ }
5785+ stbi__skip(s,9); // skip colormap specification and image x/y origin
5786+ tga_colormap_bpp = 0;
5787+ }
5788+ tga_w = stbi__get16le(s);
5789+ if( tga_w < 1 ) {
5790+ stbi__rewind(s);
5791+ return 0; // test width
5792+ }
5793+ tga_h = stbi__get16le(s);
5794+ if( tga_h < 1 ) {
5795+ stbi__rewind(s);
5796+ return 0; // test height
5797+ }
5798+ tga_bits_per_pixel = stbi__get8(s); // bits per pixel
5799+ stbi__get8(s); // ignore alpha bits
5800+ if (tga_colormap_bpp != 0) {
5801+ if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
5802+ // when using a colormap, tga_bits_per_pixel is the size of the indexes
5803+ // I don't think anything but 8 or 16bit indexes makes sense
5804+ stbi__rewind(s);
5805+ return 0;
5806+ }
5807+ tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
5808+ } else {
5809+ tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL);
5810+ }
5811+ if(!tga_comp) {
5812+ stbi__rewind(s);
5813+ return 0;
5814+ }
5815+ if (x) *x = tga_w;
5816+ if (y) *y = tga_h;
5817+ if (comp) *comp = tga_comp;
5818+ return 1; // seems to have passed everything
5819+}
5820+
5821+static int stbi__tga_test(stbi__context *s)
5822+{
5823+ int res = 0;
5824+ int sz, tga_color_type;
5825+ stbi__get8(s); // discard Offset
5826+ tga_color_type = stbi__get8(s); // color type
5827+ if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed
5828+ sz = stbi__get8(s); // image type
5829+ if ( tga_color_type == 1 ) { // colormapped (paletted) image
5830+ if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9
5831+ stbi__skip(s,4); // skip index of first colormap entry and number of entries
5832+ sz = stbi__get8(s); // check bits per palette color entry
5833+ if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
5834+ stbi__skip(s,4); // skip image x and y origin
5835+ } else { // "normal" image w/o colormap
5836+ if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE
5837+ stbi__skip(s,9); // skip colormap specification and image x/y origin
5838+ }
5839+ if ( stbi__get16le(s) < 1 ) goto errorEnd; // test width
5840+ if ( stbi__get16le(s) < 1 ) goto errorEnd; // test height
5841+ sz = stbi__get8(s); // bits per pixel
5842+ if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index
5843+ if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
5844+
5845+ res = 1; // if we got this far, everything's good and we can return 1 instead of 0
5846+
5847+errorEnd:
5848+ stbi__rewind(s);
5849+ return res;
5850+}
5851+
5852+// read 16bit value and convert to 24bit RGB
5853+static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out)
5854+{
5855+ stbi__uint16 px = (stbi__uint16)stbi__get16le(s);
5856+ stbi__uint16 fiveBitMask = 31;
5857+ // we have 3 channels with 5bits each
5858+ int r = (px >> 10) & fiveBitMask;
5859+ int g = (px >> 5) & fiveBitMask;
5860+ int b = px & fiveBitMask;
5861+ // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later
5862+ out[0] = (stbi_uc)((r * 255)/31);
5863+ out[1] = (stbi_uc)((g * 255)/31);
5864+ out[2] = (stbi_uc)((b * 255)/31);
5865+
5866+ // some people claim that the most significant bit might be used for alpha
5867+ // (possibly if an alpha-bit is set in the "image descriptor byte")
5868+ // but that only made 16bit test images completely translucent..
5869+ // so let's treat all 15 and 16bit TGAs as RGB with no alpha.
5870+}
5871+
5872+static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
5873+{
5874+ // read in the TGA header stuff
5875+ int tga_offset = stbi__get8(s);
5876+ int tga_indexed = stbi__get8(s);
5877+ int tga_image_type = stbi__get8(s);
5878+ int tga_is_RLE = 0;
5879+ int tga_palette_start = stbi__get16le(s);
5880+ int tga_palette_len = stbi__get16le(s);
5881+ int tga_palette_bits = stbi__get8(s);
5882+ int tga_x_origin = stbi__get16le(s);
5883+ int tga_y_origin = stbi__get16le(s);
5884+ int tga_width = stbi__get16le(s);
5885+ int tga_height = stbi__get16le(s);
5886+ int tga_bits_per_pixel = stbi__get8(s);
5887+ int tga_comp, tga_rgb16=0;
5888+ int tga_inverted = stbi__get8(s);
5889+ // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?)
5890+ // image data
5891+ unsigned char *tga_data;
5892+ unsigned char *tga_palette = NULL;
5893+ int i, j;
5894+ unsigned char raw_data[4] = {0};
5895+ int RLE_count = 0;
5896+ int RLE_repeating = 0;
5897+ int read_next_pixel = 1;
5898+ STBI_NOTUSED(ri);
5899+ STBI_NOTUSED(tga_x_origin); // @TODO
5900+ STBI_NOTUSED(tga_y_origin); // @TODO
5901+
5902+ if (tga_height > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
5903+ if (tga_width > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
5904+
5905+ // do a tiny bit of precessing
5906+ if ( tga_image_type >= 8 )
5907+ {
5908+ tga_image_type -= 8;
5909+ tga_is_RLE = 1;
5910+ }
5911+ tga_inverted = 1 - ((tga_inverted >> 5) & 1);
5912+
5913+ // If I'm paletted, then I'll use the number of bits from the palette
5914+ if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
5915+ else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16);
5916+
5917+ if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency
5918+ return stbi__errpuc("bad format", "Can't find out TGA pixelformat");
5919+
5920+ // tga info
5921+ *x = tga_width;
5922+ *y = tga_height;
5923+ if (comp) *comp = tga_comp;
5924+
5925+ if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0))
5926+ return stbi__errpuc("too large", "Corrupt TGA");
5927+
5928+ tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0);
5929+ if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
5930+
5931+ // skip to the data's starting position (offset usually = 0)
5932+ stbi__skip(s, tga_offset );
5933+
5934+ if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) {
5935+ for (i=0; i < tga_height; ++i) {
5936+ int row = tga_inverted ? tga_height -i - 1 : i;
5937+ stbi_uc *tga_row = tga_data + row*tga_width*tga_comp;
5938+ stbi__getn(s, tga_row, tga_width * tga_comp);
5939+ }
5940+ } else {
5941+ // do I need to load a palette?
5942+ if ( tga_indexed)
5943+ {
5944+ if (tga_palette_len == 0) { /* you have to have at least one entry! */
5945+ STBI_FREE(tga_data);
5946+ return stbi__errpuc("bad palette", "Corrupt TGA");
5947+ }
5948+
5949+ // any data to skip? (offset usually = 0)
5950+ stbi__skip(s, tga_palette_start );
5951+ // load the palette
5952+ tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0);
5953+ if (!tga_palette) {
5954+ STBI_FREE(tga_data);
5955+ return stbi__errpuc("outofmem", "Out of memory");
5956+ }
5957+ if (tga_rgb16) {
5958+ stbi_uc *pal_entry = tga_palette;
5959+ STBI_ASSERT(tga_comp == STBI_rgb);
5960+ for (i=0; i < tga_palette_len; ++i) {
5961+ stbi__tga_read_rgb16(s, pal_entry);
5962+ pal_entry += tga_comp;
5963+ }
5964+ } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {
5965+ STBI_FREE(tga_data);
5966+ STBI_FREE(tga_palette);
5967+ return stbi__errpuc("bad palette", "Corrupt TGA");
5968+ }
5969+ }
5970+ // load the data
5971+ for (i=0; i < tga_width * tga_height; ++i)
5972+ {
5973+ // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
5974+ if ( tga_is_RLE )
5975+ {
5976+ if ( RLE_count == 0 )
5977+ {
5978+ // yep, get the next byte as a RLE command
5979+ int RLE_cmd = stbi__get8(s);
5980+ RLE_count = 1 + (RLE_cmd & 127);
5981+ RLE_repeating = RLE_cmd >> 7;
5982+ read_next_pixel = 1;
5983+ } else if ( !RLE_repeating )
5984+ {
5985+ read_next_pixel = 1;
5986+ }
5987+ } else
5988+ {
5989+ read_next_pixel = 1;
5990+ }
5991+ // OK, if I need to read a pixel, do it now
5992+ if ( read_next_pixel )
5993+ {
5994+ // load however much data we did have
5995+ if ( tga_indexed )
5996+ {
5997+ // read in index, then perform the lookup
5998+ int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
5999+ if ( pal_idx >= tga_palette_len ) {
6000+ // invalid index
6001+ pal_idx = 0;
6002+ }
6003+ pal_idx *= tga_comp;
6004+ for (j = 0; j < tga_comp; ++j) {
6005+ raw_data[j] = tga_palette[pal_idx+j];
6006+ }
6007+ } else if(tga_rgb16) {
6008+ STBI_ASSERT(tga_comp == STBI_rgb);
6009+ stbi__tga_read_rgb16(s, raw_data);
6010+ } else {
6011+ // read in the data raw
6012+ for (j = 0; j < tga_comp; ++j) {
6013+ raw_data[j] = stbi__get8(s);
6014+ }
6015+ }
6016+ // clear the reading flag for the next pixel
6017+ read_next_pixel = 0;
6018+ } // end of reading a pixel
6019+
6020+ // copy data
6021+ for (j = 0; j < tga_comp; ++j)
6022+ tga_data[i*tga_comp+j] = raw_data[j];
6023+
6024+ // in case we're in RLE mode, keep counting down
6025+ --RLE_count;
6026+ }
6027+ // do I need to invert the image?
6028+ if ( tga_inverted )
6029+ {
6030+ for (j = 0; j*2 < tga_height; ++j)
6031+ {
6032+ int index1 = j * tga_width * tga_comp;
6033+ int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
6034+ for (i = tga_width * tga_comp; i > 0; --i)
6035+ {
6036+ unsigned char temp = tga_data[index1];
6037+ tga_data[index1] = tga_data[index2];
6038+ tga_data[index2] = temp;
6039+ ++index1;
6040+ ++index2;
6041+ }
6042+ }
6043+ }
6044+ // clear my palette, if I had one
6045+ if ( tga_palette != NULL )
6046+ {
6047+ STBI_FREE( tga_palette );
6048+ }
6049+ }
6050+
6051+ // swap RGB - if the source data was RGB16, it already is in the right order
6052+ if (tga_comp >= 3 && !tga_rgb16)
6053+ {
6054+ unsigned char* tga_pixel = tga_data;
6055+ for (i=0; i < tga_width * tga_height; ++i)
6056+ {
6057+ unsigned char temp = tga_pixel[0];
6058+ tga_pixel[0] = tga_pixel[2];
6059+ tga_pixel[2] = temp;
6060+ tga_pixel += tga_comp;
6061+ }
6062+ }
6063+
6064+ // convert to target component count
6065+ if (req_comp && req_comp != tga_comp)
6066+ tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
6067+
6068+ // the things I do to get rid of an error message, and yet keep
6069+ // Microsoft's C compilers happy... [8^(
6070+ tga_palette_start = tga_palette_len = tga_palette_bits =
6071+ tga_x_origin = tga_y_origin = 0;
6072+ STBI_NOTUSED(tga_palette_start);
6073+ // OK, done
6074+ return tga_data;
6075+}
6076+#endif
6077+
6078+// *************************************************************************************************
6079+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
6080+
6081+#ifndef STBI_NO_PSD
6082+static int stbi__psd_test(stbi__context *s)
6083+{
6084+ int r = (stbi__get32be(s) == 0x38425053);
6085+ stbi__rewind(s);
6086+ return r;
6087+}
6088+
6089+static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount)
6090+{
6091+ int count, nleft, len;
6092+
6093+ count = 0;
6094+ while ((nleft = pixelCount - count) > 0) {
6095+ len = stbi__get8(s);
6096+ if (len == 128) {
6097+ // No-op.
6098+ } else if (len < 128) {
6099+ // Copy next len+1 bytes literally.
6100+ len++;
6101+ if (len > nleft) return 0; // corrupt data
6102+ count += len;
6103+ while (len) {
6104+ *p = stbi__get8(s);
6105+ p += 4;
6106+ len--;
6107+ }
6108+ } else if (len > 128) {
6109+ stbi_uc val;
6110+ // Next -len+1 bytes in the dest are replicated from next source byte.
6111+ // (Interpret len as a negative 8-bit int.)
6112+ len = 257 - len;
6113+ if (len > nleft) return 0; // corrupt data
6114+ val = stbi__get8(s);
6115+ count += len;
6116+ while (len) {
6117+ *p = val;
6118+ p += 4;
6119+ len--;
6120+ }
6121+ }
6122+ }
6123+
6124+ return 1;
6125+}
6126+
6127+static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
6128+{
6129+ int pixelCount;
6130+ int channelCount, compression;
6131+ int channel, i;
6132+ int bitdepth;
6133+ int w,h;
6134+ stbi_uc *out;
6135+ STBI_NOTUSED(ri);
6136+
6137+ // Check identifier
6138+ if (stbi__get32be(s) != 0x38425053) // "8BPS"
6139+ return stbi__errpuc("not PSD", "Corrupt PSD image");
6140+
6141+ // Check file type version.
6142+ if (stbi__get16be(s) != 1)
6143+ return stbi__errpuc("wrong version", "Unsupported version of PSD image");
6144+
6145+ // Skip 6 reserved bytes.
6146+ stbi__skip(s, 6 );
6147+
6148+ // Read the number of channels (R, G, B, A, etc).
6149+ channelCount = stbi__get16be(s);
6150+ if (channelCount < 0 || channelCount > 16)
6151+ return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");
6152+
6153+ // Read the rows and columns of the image.
6154+ h = stbi__get32be(s);
6155+ w = stbi__get32be(s);
6156+
6157+ if (h > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
6158+ if (w > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
6159+
6160+ // Make sure the depth is 8 bits.
6161+ bitdepth = stbi__get16be(s);
6162+ if (bitdepth != 8 && bitdepth != 16)
6163+ return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");
6164+
6165+ // Make sure the color mode is RGB.
6166+ // Valid options are:
6167+ // 0: Bitmap
6168+ // 1: Grayscale
6169+ // 2: Indexed color
6170+ // 3: RGB color
6171+ // 4: CMYK color
6172+ // 7: Multichannel
6173+ // 8: Duotone
6174+ // 9: Lab color
6175+ if (stbi__get16be(s) != 3)
6176+ return stbi__errpuc("wrong color format", "PSD is not in RGB color format");
6177+
6178+ // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.)
6179+ stbi__skip(s,stbi__get32be(s) );
6180+
6181+ // Skip the image resources. (resolution, pen tool paths, etc)
6182+ stbi__skip(s, stbi__get32be(s) );
6183+
6184+ // Skip the reserved data.
6185+ stbi__skip(s, stbi__get32be(s) );
6186+
6187+ // Find out if the data is compressed.
6188+ // Known values:
6189+ // 0: no compression
6190+ // 1: RLE compressed
6191+ compression = stbi__get16be(s);
6192+ if (compression > 1)
6193+ return stbi__errpuc("bad compression", "PSD has an unknown compression format");
6194+
6195+ // Check size
6196+ if (!stbi__mad3sizes_valid(4, w, h, 0))
6197+ return stbi__errpuc("too large", "Corrupt PSD");
6198+
6199+ // Create the destination image.
6200+
6201+ if (!compression && bitdepth == 16 && bpc == 16) {
6202+ out = (stbi_uc *) stbi__malloc_mad3(8, w, h, 0);
6203+ ri->bits_per_channel = 16;
6204+ } else
6205+ out = (stbi_uc *) stbi__malloc(4 * w*h);
6206+
6207+ if (!out) return stbi__errpuc("outofmem", "Out of memory");
6208+ pixelCount = w*h;
6209+
6210+ // Initialize the data to zero.
6211+ //memset( out, 0, pixelCount * 4 );
6212+
6213+ // Finally, the image data.
6214+ if (compression) {
6215+ // RLE as used by .PSD and .TIFF
6216+ // Loop until you get the number of unpacked bytes you are expecting:
6217+ // Read the next source byte into n.
6218+ // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
6219+ // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
6220+ // Else if n is 128, noop.
6221+ // Endloop
6222+
6223+ // The RLE-compressed data is preceded by a 2-byte data count for each row in the data,
6224+ // which we're going to just skip.
6225+ stbi__skip(s, h * channelCount * 2 );
6226+
6227+ // Read the RLE data by channel.
6228+ for (channel = 0; channel < 4; channel++) {
6229+ stbi_uc *p;
6230+
6231+ p = out+channel;
6232+ if (channel >= channelCount) {
6233+ // Fill this channel with default data.
6234+ for (i = 0; i < pixelCount; i++, p += 4)
6235+ *p = (channel == 3 ? 255 : 0);
6236+ } else {
6237+ // Read the RLE data.
6238+ if (!stbi__psd_decode_rle(s, p, pixelCount)) {
6239+ STBI_FREE(out);
6240+ return stbi__errpuc("corrupt", "bad RLE data");
6241+ }
6242+ }
6243+ }
6244+
6245+ } else {
6246+ // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...)
6247+ // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image.
6248+
6249+ // Read the data by channel.
6250+ for (channel = 0; channel < 4; channel++) {
6251+ if (channel >= channelCount) {
6252+ // Fill this channel with default data.
6253+ if (bitdepth == 16 && bpc == 16) {
6254+ stbi__uint16 *q = ((stbi__uint16 *) out) + channel;
6255+ stbi__uint16 val = channel == 3 ? 65535 : 0;
6256+ for (i = 0; i < pixelCount; i++, q += 4)
6257+ *q = val;
6258+ } else {
6259+ stbi_uc *p = out+channel;
6260+ stbi_uc val = channel == 3 ? 255 : 0;
6261+ for (i = 0; i < pixelCount; i++, p += 4)
6262+ *p = val;
6263+ }
6264+ } else {
6265+ if (ri->bits_per_channel == 16) { // output bpc
6266+ stbi__uint16 *q = ((stbi__uint16 *) out) + channel;
6267+ for (i = 0; i < pixelCount; i++, q += 4)
6268+ *q = (stbi__uint16) stbi__get16be(s);
6269+ } else {
6270+ stbi_uc *p = out+channel;
6271+ if (bitdepth == 16) { // input bpc
6272+ for (i = 0; i < pixelCount; i++, p += 4)
6273+ *p = (stbi_uc) (stbi__get16be(s) >> 8);
6274+ } else {
6275+ for (i = 0; i < pixelCount; i++, p += 4)
6276+ *p = stbi__get8(s);
6277+ }
6278+ }
6279+ }
6280+ }
6281+ }
6282+
6283+ // remove weird white matte from PSD
6284+ if (channelCount >= 4) {
6285+ if (ri->bits_per_channel == 16) {
6286+ for (i=0; i < w*h; ++i) {
6287+ stbi__uint16 *pixel = (stbi__uint16 *) out + 4*i;
6288+ if (pixel[3] != 0 && pixel[3] != 65535) {
6289+ float a = pixel[3] / 65535.0f;
6290+ float ra = 1.0f / a;
6291+ float inv_a = 65535.0f * (1 - ra);
6292+ pixel[0] = (stbi__uint16) (pixel[0]*ra + inv_a);
6293+ pixel[1] = (stbi__uint16) (pixel[1]*ra + inv_a);
6294+ pixel[2] = (stbi__uint16) (pixel[2]*ra + inv_a);
6295+ }
6296+ }
6297+ } else {
6298+ for (i=0; i < w*h; ++i) {
6299+ unsigned char *pixel = out + 4*i;
6300+ if (pixel[3] != 0 && pixel[3] != 255) {
6301+ float a = pixel[3] / 255.0f;
6302+ float ra = 1.0f / a;
6303+ float inv_a = 255.0f * (1 - ra);
6304+ pixel[0] = (unsigned char) (pixel[0]*ra + inv_a);
6305+ pixel[1] = (unsigned char) (pixel[1]*ra + inv_a);
6306+ pixel[2] = (unsigned char) (pixel[2]*ra + inv_a);
6307+ }
6308+ }
6309+ }
6310+ }
6311+
6312+ // convert to desired output format
6313+ if (req_comp && req_comp != 4) {
6314+ if (ri->bits_per_channel == 16)
6315+ out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, 4, req_comp, w, h);
6316+ else
6317+ out = stbi__convert_format(out, 4, req_comp, w, h);
6318+ if (out == NULL) return out; // stbi__convert_format frees input on failure
6319+ }
6320+
6321+ if (comp) *comp = 4;
6322+ *y = h;
6323+ *x = w;
6324+
6325+ return out;
6326+}
6327+#endif
6328+
6329+// *************************************************************************************************
6330+// Softimage PIC loader
6331+// by Tom Seddon
6332+//
6333+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
6334+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
6335+
6336+#ifndef STBI_NO_PIC
6337+static int stbi__pic_is4(stbi__context *s,const char *str)
6338+{
6339+ int i;
6340+ for (i=0; i<4; ++i)
6341+ if (stbi__get8(s) != (stbi_uc)str[i])
6342+ return 0;
6343+
6344+ return 1;
6345+}
6346+
6347+static int stbi__pic_test_core(stbi__context *s)
6348+{
6349+ int i;
6350+
6351+ if (!stbi__pic_is4(s,"\x53\x80\xF6\x34"))
6352+ return 0;
6353+
6354+ for(i=0;i<84;++i)
6355+ stbi__get8(s);
6356+
6357+ if (!stbi__pic_is4(s,"PICT"))
6358+ return 0;
6359+
6360+ return 1;
6361+}
6362+
6363+typedef struct
6364+{
6365+ stbi_uc size,type,channel;
6366+} stbi__pic_packet;
6367+
6368+static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest)
6369+{
6370+ int mask=0x80, i;
6371+
6372+ for (i=0; i<4; ++i, mask>>=1) {
6373+ if (channel & mask) {
6374+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short");
6375+ dest[i]=stbi__get8(s);
6376+ }
6377+ }
6378+
6379+ return dest;
6380+}
6381+
6382+static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src)
6383+{
6384+ int mask=0x80,i;
6385+
6386+ for (i=0;i<4; ++i, mask>>=1)
6387+ if (channel&mask)
6388+ dest[i]=src[i];
6389+}
6390+
6391+static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result)
6392+{
6393+ int act_comp=0,num_packets=0,y,chained;
6394+ stbi__pic_packet packets[10];
6395+
6396+ // this will (should...) cater for even some bizarre stuff like having data
6397+ // for the same channel in multiple packets.
6398+ do {
6399+ stbi__pic_packet *packet;
6400+
6401+ if (num_packets==sizeof(packets)/sizeof(packets[0]))
6402+ return stbi__errpuc("bad format","too many packets");
6403+
6404+ packet = &packets[num_packets++];
6405+
6406+ chained = stbi__get8(s);
6407+ packet->size = stbi__get8(s);
6408+ packet->type = stbi__get8(s);
6409+ packet->channel = stbi__get8(s);
6410+
6411+ act_comp |= packet->channel;
6412+
6413+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)");
6414+ if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp");
6415+ } while (chained);
6416+
6417+ *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
6418+
6419+ for(y=0; y<height; ++y) {
6420+ int packet_idx;
6421+
6422+ for(packet_idx=0; packet_idx < num_packets; ++packet_idx) {
6423+ stbi__pic_packet *packet = &packets[packet_idx];
6424+ stbi_uc *dest = result+y*width*4;
6425+
6426+ switch (packet->type) {
6427+ default:
6428+ return stbi__errpuc("bad format","packet has bad compression type");
6429+
6430+ case 0: {//uncompressed
6431+ int x;
6432+
6433+ for(x=0;x<width;++x, dest+=4)
6434+ if (!stbi__readval(s,packet->channel,dest))
6435+ return 0;
6436+ break;
6437+ }
6438+
6439+ case 1://Pure RLE
6440+ {
6441+ int left=width, i;
6442+
6443+ while (left>0) {
6444+ stbi_uc count,value[4];
6445+
6446+ count=stbi__get8(s);
6447+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)");
6448+
6449+ if (count > left)
6450+ count = (stbi_uc) left;
6451+
6452+ if (!stbi__readval(s,packet->channel,value)) return 0;
6453+
6454+ for(i=0; i<count; ++i,dest+=4)
6455+ stbi__copyval(packet->channel,dest,value);
6456+ left -= count;
6457+ }
6458+ }
6459+ break;
6460+
6461+ case 2: {//Mixed RLE
6462+ int left=width;
6463+ while (left>0) {
6464+ int count = stbi__get8(s), i;
6465+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)");
6466+
6467+ if (count >= 128) { // Repeated
6468+ stbi_uc value[4];
6469+
6470+ if (count==128)
6471+ count = stbi__get16be(s);
6472+ else
6473+ count -= 127;
6474+ if (count > left)
6475+ return stbi__errpuc("bad file","scanline overrun");
6476+
6477+ if (!stbi__readval(s,packet->channel,value))
6478+ return 0;
6479+
6480+ for(i=0;i<count;++i, dest += 4)
6481+ stbi__copyval(packet->channel,dest,value);
6482+ } else { // Raw
6483+ ++count;
6484+ if (count>left) return stbi__errpuc("bad file","scanline overrun");
6485+
6486+ for(i=0;i<count;++i, dest+=4)
6487+ if (!stbi__readval(s,packet->channel,dest))
6488+ return 0;
6489+ }
6490+ left-=count;
6491+ }
6492+ break;
6493+ }
6494+ }
6495+ }
6496+ }
6497+
6498+ return result;
6499+}
6500+
6501+static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri)
6502+{
6503+ stbi_uc *result;
6504+ int i, x,y, internal_comp;
6505+ STBI_NOTUSED(ri);
6506+
6507+ if (!comp) comp = &internal_comp;
6508+
6509+ for (i=0; i<92; ++i)
6510+ stbi__get8(s);
6511+
6512+ x = stbi__get16be(s);
6513+ y = stbi__get16be(s);
6514+
6515+ if (y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
6516+ if (x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
6517+
6518+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)");
6519+ if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode");
6520+
6521+ stbi__get32be(s); //skip `ratio'
6522+ stbi__get16be(s); //skip `fields'
6523+ stbi__get16be(s); //skip `pad'
6524+
6525+ // intermediate buffer is RGBA
6526+ result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0);
6527+ if (!result) return stbi__errpuc("outofmem", "Out of memory");
6528+ memset(result, 0xff, x*y*4);
6529+
6530+ if (!stbi__pic_load_core(s,x,y,comp, result)) {
6531+ STBI_FREE(result);
6532+ result=0;
6533+ }
6534+ *px = x;
6535+ *py = y;
6536+ if (req_comp == 0) req_comp = *comp;
6537+ result=stbi__convert_format(result,4,req_comp,x,y);
6538+
6539+ return result;
6540+}
6541+
6542+static int stbi__pic_test(stbi__context *s)
6543+{
6544+ int r = stbi__pic_test_core(s);
6545+ stbi__rewind(s);
6546+ return r;
6547+}
6548+#endif
6549+
6550+// *************************************************************************************************
6551+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
6552+
6553+#ifndef STBI_NO_GIF
6554+typedef struct
6555+{
6556+ stbi__int16 prefix;
6557+ stbi_uc first;
6558+ stbi_uc suffix;
6559+} stbi__gif_lzw;
6560+
6561+typedef struct
6562+{
6563+ int w,h;
6564+ stbi_uc *out; // output buffer (always 4 components)
6565+ stbi_uc *background; // The current "background" as far as a gif is concerned
6566+ stbi_uc *history;
6567+ int flags, bgindex, ratio, transparent, eflags;
6568+ stbi_uc pal[256][4];
6569+ stbi_uc lpal[256][4];
6570+ stbi__gif_lzw codes[8192];
6571+ stbi_uc *color_table;
6572+ int parse, step;
6573+ int lflags;
6574+ int start_x, start_y;
6575+ int max_x, max_y;
6576+ int cur_x, cur_y;
6577+ int line_size;
6578+ int delay;
6579+} stbi__gif;
6580+
6581+static int stbi__gif_test_raw(stbi__context *s)
6582+{
6583+ int sz;
6584+ if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0;
6585+ sz = stbi__get8(s);
6586+ if (sz != '9' && sz != '7') return 0;
6587+ if (stbi__get8(s) != 'a') return 0;
6588+ return 1;
6589+}
6590+
6591+static int stbi__gif_test(stbi__context *s)
6592+{
6593+ int r = stbi__gif_test_raw(s);
6594+ stbi__rewind(s);
6595+ return r;
6596+}
6597+
6598+static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp)
6599+{
6600+ int i;
6601+ for (i=0; i < num_entries; ++i) {
6602+ pal[i][2] = stbi__get8(s);
6603+ pal[i][1] = stbi__get8(s);
6604+ pal[i][0] = stbi__get8(s);
6605+ pal[i][3] = transp == i ? 0 : 255;
6606+ }
6607+}
6608+
6609+static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info)
6610+{
6611+ stbi_uc version;
6612+ if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
6613+ return stbi__err("not GIF", "Corrupt GIF");
6614+
6615+ version = stbi__get8(s);
6616+ if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF");
6617+ if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF");
6618+
6619+ stbi__g_failure_reason = "";
6620+ g->w = stbi__get16le(s);
6621+ g->h = stbi__get16le(s);
6622+ g->flags = stbi__get8(s);
6623+ g->bgindex = stbi__get8(s);
6624+ g->ratio = stbi__get8(s);
6625+ g->transparent = -1;
6626+
6627+ if (g->w > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
6628+ if (g->h > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
6629+
6630+ if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments
6631+
6632+ if (is_info) return 1;
6633+
6634+ if (g->flags & 0x80)
6635+ stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1);
6636+
6637+ return 1;
6638+}
6639+
6640+static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp)
6641+{
6642+ stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif));
6643+ if (!g) return stbi__err("outofmem", "Out of memory");
6644+ if (!stbi__gif_header(s, g, comp, 1)) {
6645+ STBI_FREE(g);
6646+ stbi__rewind( s );
6647+ return 0;
6648+ }
6649+ if (x) *x = g->w;
6650+ if (y) *y = g->h;
6651+ STBI_FREE(g);
6652+ return 1;
6653+}
6654+
6655+static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
6656+{
6657+ stbi_uc *p, *c;
6658+ int idx;
6659+
6660+ // recurse to decode the prefixes, since the linked-list is backwards,
6661+ // and working backwards through an interleaved image would be nasty
6662+ if (g->codes[code].prefix >= 0)
6663+ stbi__out_gif_code(g, g->codes[code].prefix);
6664+
6665+ if (g->cur_y >= g->max_y) return;
6666+
6667+ idx = g->cur_x + g->cur_y;
6668+ p = &g->out[idx];
6669+ g->history[idx / 4] = 1;
6670+
6671+ c = &g->color_table[g->codes[code].suffix * 4];
6672+ if (c[3] > 128) { // don't render transparent pixels;
6673+ p[0] = c[2];
6674+ p[1] = c[1];
6675+ p[2] = c[0];
6676+ p[3] = c[3];
6677+ }
6678+ g->cur_x += 4;
6679+
6680+ if (g->cur_x >= g->max_x) {
6681+ g->cur_x = g->start_x;
6682+ g->cur_y += g->step;
6683+
6684+ while (g->cur_y >= g->max_y && g->parse > 0) {
6685+ g->step = (1 << g->parse) * g->line_size;
6686+ g->cur_y = g->start_y + (g->step >> 1);
6687+ --g->parse;
6688+ }
6689+ }
6690+}
6691+
6692+static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
6693+{
6694+ stbi_uc lzw_cs;
6695+ stbi__int32 len, init_code;
6696+ stbi__uint32 first;
6697+ stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
6698+ stbi__gif_lzw *p;
6699+
6700+ lzw_cs = stbi__get8(s);
6701+ if (lzw_cs > 12) return NULL;
6702+ clear = 1 << lzw_cs;
6703+ first = 1;
6704+ codesize = lzw_cs + 1;
6705+ codemask = (1 << codesize) - 1;
6706+ bits = 0;
6707+ valid_bits = 0;
6708+ for (init_code = 0; init_code < clear; init_code++) {
6709+ g->codes[init_code].prefix = -1;
6710+ g->codes[init_code].first = (stbi_uc) init_code;
6711+ g->codes[init_code].suffix = (stbi_uc) init_code;
6712+ }
6713+
6714+ // support no starting clear code
6715+ avail = clear+2;
6716+ oldcode = -1;
6717+
6718+ len = 0;
6719+ for(;;) {
6720+ if (valid_bits < codesize) {
6721+ if (len == 0) {
6722+ len = stbi__get8(s); // start new block
6723+ if (len == 0)
6724+ return g->out;
6725+ }
6726+ --len;
6727+ bits |= (stbi__int32) stbi__get8(s) << valid_bits;
6728+ valid_bits += 8;
6729+ } else {
6730+ stbi__int32 code = bits & codemask;
6731+ bits >>= codesize;
6732+ valid_bits -= codesize;
6733+ // @OPTIMIZE: is there some way we can accelerate the non-clear path?
6734+ if (code == clear) { // clear code
6735+ codesize = lzw_cs + 1;
6736+ codemask = (1 << codesize) - 1;
6737+ avail = clear + 2;
6738+ oldcode = -1;
6739+ first = 0;
6740+ } else if (code == clear + 1) { // end of stream code
6741+ stbi__skip(s, len);
6742+ while ((len = stbi__get8(s)) > 0)
6743+ stbi__skip(s,len);
6744+ return g->out;
6745+ } else if (code <= avail) {
6746+ if (first) {
6747+ return stbi__errpuc("no clear code", "Corrupt GIF");
6748+ }
6749+
6750+ if (oldcode >= 0) {
6751+ p = &g->codes[avail++];
6752+ if (avail > 8192) {
6753+ return stbi__errpuc("too many codes", "Corrupt GIF");
6754+ }
6755+
6756+ p->prefix = (stbi__int16) oldcode;
6757+ p->first = g->codes[oldcode].first;
6758+ p->suffix = (code == avail) ? p->first : g->codes[code].first;
6759+ } else if (code == avail)
6760+ return stbi__errpuc("illegal code in raster", "Corrupt GIF");
6761+
6762+ stbi__out_gif_code(g, (stbi__uint16) code);
6763+
6764+ if ((avail & codemask) == 0 && avail <= 0x0FFF) {
6765+ codesize++;
6766+ codemask = (1 << codesize) - 1;
6767+ }
6768+
6769+ oldcode = code;
6770+ } else {
6771+ return stbi__errpuc("illegal code in raster", "Corrupt GIF");
6772+ }
6773+ }
6774+ }
6775+}
6776+
6777+// this function is designed to support animated gifs, although stb_image doesn't support it
6778+// two back is the image from two frames ago, used for a very specific disposal format
6779+static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp, stbi_uc *two_back)
6780+{
6781+ int dispose;
6782+ int first_frame;
6783+ int pi;
6784+ int pcount;
6785+ STBI_NOTUSED(req_comp);
6786+
6787+ // on first frame, any non-written pixels get the background colour (non-transparent)
6788+ first_frame = 0;
6789+ if (g->out == 0) {
6790+ if (!stbi__gif_header(s, g, comp,0)) return 0; // stbi__g_failure_reason set by stbi__gif_header
6791+ if (!stbi__mad3sizes_valid(4, g->w, g->h, 0))
6792+ return stbi__errpuc("too large", "GIF image is too large");
6793+ pcount = g->w * g->h;
6794+ g->out = (stbi_uc *) stbi__malloc(4 * pcount);
6795+ g->background = (stbi_uc *) stbi__malloc(4 * pcount);
6796+ g->history = (stbi_uc *) stbi__malloc(pcount);
6797+ if (!g->out || !g->background || !g->history)
6798+ return stbi__errpuc("outofmem", "Out of memory");
6799+
6800+ // image is treated as "transparent" at the start - ie, nothing overwrites the current background;
6801+ // background colour is only used for pixels that are not rendered first frame, after that "background"
6802+ // color refers to the color that was there the previous frame.
6803+ memset(g->out, 0x00, 4 * pcount);
6804+ memset(g->background, 0x00, 4 * pcount); // state of the background (starts transparent)
6805+ memset(g->history, 0x00, pcount); // pixels that were affected previous frame
6806+ first_frame = 1;
6807+ } else {
6808+ // second frame - how do we dispose of the previous one?
6809+ dispose = (g->eflags & 0x1C) >> 2;
6810+ pcount = g->w * g->h;
6811+
6812+ if ((dispose == 3) && (two_back == 0)) {
6813+ dispose = 2; // if I don't have an image to revert back to, default to the old background
6814+ }
6815+
6816+ if (dispose == 3) { // use previous graphic
6817+ for (pi = 0; pi < pcount; ++pi) {
6818+ if (g->history[pi]) {
6819+ memcpy( &g->out[pi * 4], &two_back[pi * 4], 4 );
6820+ }
6821+ }
6822+ } else if (dispose == 2) {
6823+ // restore what was changed last frame to background before that frame;
6824+ for (pi = 0; pi < pcount; ++pi) {
6825+ if (g->history[pi]) {
6826+ memcpy( &g->out[pi * 4], &g->background[pi * 4], 4 );
6827+ }
6828+ }
6829+ } else {
6830+ // This is a non-disposal case eithe way, so just
6831+ // leave the pixels as is, and they will become the new background
6832+ // 1: do not dispose
6833+ // 0: not specified.
6834+ }
6835+
6836+ // background is what out is after the undoing of the previou frame;
6837+ memcpy( g->background, g->out, 4 * g->w * g->h );
6838+ }
6839+
6840+ // clear my history;
6841+ memset( g->history, 0x00, g->w * g->h ); // pixels that were affected previous frame
6842+
6843+ for (;;) {
6844+ int tag = stbi__get8(s);
6845+ switch (tag) {
6846+ case 0x2C: /* Image Descriptor */
6847+ {
6848+ stbi__int32 x, y, w, h;
6849+ stbi_uc *o;
6850+
6851+ x = stbi__get16le(s);
6852+ y = stbi__get16le(s);
6853+ w = stbi__get16le(s);
6854+ h = stbi__get16le(s);
6855+ if (((x + w) > (g->w)) || ((y + h) > (g->h)))
6856+ return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
6857+
6858+ g->line_size = g->w * 4;
6859+ g->start_x = x * 4;
6860+ g->start_y = y * g->line_size;
6861+ g->max_x = g->start_x + w * 4;
6862+ g->max_y = g->start_y + h * g->line_size;
6863+ g->cur_x = g->start_x;
6864+ g->cur_y = g->start_y;
6865+
6866+ // if the width of the specified rectangle is 0, that means
6867+ // we may not see *any* pixels or the image is malformed;
6868+ // to make sure this is caught, move the current y down to
6869+ // max_y (which is what out_gif_code checks).
6870+ if (w == 0)
6871+ g->cur_y = g->max_y;
6872+
6873+ g->lflags = stbi__get8(s);
6874+
6875+ if (g->lflags & 0x40) {
6876+ g->step = 8 * g->line_size; // first interlaced spacing
6877+ g->parse = 3;
6878+ } else {
6879+ g->step = g->line_size;
6880+ g->parse = 0;
6881+ }
6882+
6883+ if (g->lflags & 0x80) {
6884+ stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
6885+ g->color_table = (stbi_uc *) g->lpal;
6886+ } else if (g->flags & 0x80) {
6887+ g->color_table = (stbi_uc *) g->pal;
6888+ } else
6889+ return stbi__errpuc("missing color table", "Corrupt GIF");
6890+
6891+ o = stbi__process_gif_raster(s, g);
6892+ if (!o) return NULL;
6893+
6894+ // if this was the first frame,
6895+ pcount = g->w * g->h;
6896+ if (first_frame && (g->bgindex > 0)) {
6897+ // if first frame, any pixel not drawn to gets the background color
6898+ for (pi = 0; pi < pcount; ++pi) {
6899+ if (g->history[pi] == 0) {
6900+ g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo that; It will be reset next frame if need be;
6901+ memcpy( &g->out[pi * 4], &g->pal[g->bgindex], 4 );
6902+ }
6903+ }
6904+ }
6905+
6906+ return o;
6907+ }
6908+
6909+ case 0x21: // Comment Extension.
6910+ {
6911+ int len;
6912+ int ext = stbi__get8(s);
6913+ if (ext == 0xF9) { // Graphic Control Extension.
6914+ len = stbi__get8(s);
6915+ if (len == 4) {
6916+ g->eflags = stbi__get8(s);
6917+ g->delay = 10 * stbi__get16le(s); // delay - 1/100th of a second, saving as 1/1000ths.
6918+
6919+ // unset old transparent
6920+ if (g->transparent >= 0) {
6921+ g->pal[g->transparent][3] = 255;
6922+ }
6923+ if (g->eflags & 0x01) {
6924+ g->transparent = stbi__get8(s);
6925+ if (g->transparent >= 0) {
6926+ g->pal[g->transparent][3] = 0;
6927+ }
6928+ } else {
6929+ // don't need transparent
6930+ stbi__skip(s, 1);
6931+ g->transparent = -1;
6932+ }
6933+ } else {
6934+ stbi__skip(s, len);
6935+ break;
6936+ }
6937+ }
6938+ while ((len = stbi__get8(s)) != 0) {
6939+ stbi__skip(s, len);
6940+ }
6941+ break;
6942+ }
6943+
6944+ case 0x3B: // gif stream termination code
6945+ return (stbi_uc *) s; // using '1' causes warning on some compilers
6946+
6947+ default:
6948+ return stbi__errpuc("unknown code", "Corrupt GIF");
6949+ }
6950+ }
6951+}
6952+
6953+static void *stbi__load_gif_main_outofmem(stbi__gif *g, stbi_uc *out, int **delays)
6954+{
6955+ STBI_FREE(g->out);
6956+ STBI_FREE(g->history);
6957+ STBI_FREE(g->background);
6958+
6959+ if (out) STBI_FREE(out);
6960+ if (delays && *delays) STBI_FREE(*delays);
6961+ return stbi__errpuc("outofmem", "Out of memory");
6962+}
6963+
6964+static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp)
6965+{
6966+ if (stbi__gif_test(s)) {
6967+ int layers = 0;
6968+ stbi_uc *u = 0;
6969+ stbi_uc *out = 0;
6970+ stbi_uc *two_back = 0;
6971+ stbi__gif g;
6972+ int stride;
6973+ int out_size = 0;
6974+ int delays_size = 0;
6975+
6976+ STBI_NOTUSED(out_size);
6977+ STBI_NOTUSED(delays_size);
6978+
6979+ memset(&g, 0, sizeof(g));
6980+ if (delays) {
6981+ *delays = 0;
6982+ }
6983+
6984+ do {
6985+ u = stbi__gif_load_next(s, &g, comp, req_comp, two_back);
6986+ if (u == (stbi_uc *) s) u = 0; // end of animated gif marker
6987+
6988+ if (u) {
6989+ *x = g.w;
6990+ *y = g.h;
6991+ ++layers;
6992+ stride = g.w * g.h * 4;
6993+
6994+ if (out) {
6995+ void *tmp = (stbi_uc*) STBI_REALLOC_SIZED( out, out_size, layers * stride );
6996+ if (!tmp)
6997+ return stbi__load_gif_main_outofmem(&g, out, delays);
6998+ else {
6999+ out = (stbi_uc*) tmp;
7000+ out_size = layers * stride;
7001+ }
7002+
7003+ if (delays) {
7004+ int *new_delays = (int*) STBI_REALLOC_SIZED( *delays, delays_size, sizeof(int) * layers );
7005+ if (!new_delays)
7006+ return stbi__load_gif_main_outofmem(&g, out, delays);
7007+ *delays = new_delays;
7008+ delays_size = layers * sizeof(int);
7009+ }
7010+ } else {
7011+ out = (stbi_uc*)stbi__malloc( layers * stride );
7012+ if (!out)
7013+ return stbi__load_gif_main_outofmem(&g, out, delays);
7014+ out_size = layers * stride;
7015+ if (delays) {
7016+ *delays = (int*) stbi__malloc( layers * sizeof(int) );
7017+ if (!*delays)
7018+ return stbi__load_gif_main_outofmem(&g, out, delays);
7019+ delays_size = layers * sizeof(int);
7020+ }
7021+ }
7022+ memcpy( out + ((layers - 1) * stride), u, stride );
7023+ if (layers >= 2) {
7024+ two_back = out - 2 * stride;
7025+ }
7026+
7027+ if (delays) {
7028+ (*delays)[layers - 1U] = g.delay;
7029+ }
7030+ }
7031+ } while (u != 0);
7032+
7033+ // free temp buffer;
7034+ STBI_FREE(g.out);
7035+ STBI_FREE(g.history);
7036+ STBI_FREE(g.background);
7037+
7038+ // do the final conversion after loading everything;
7039+ if (req_comp && req_comp != 4)
7040+ out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h);
7041+
7042+ *z = layers;
7043+ return out;
7044+ } else {
7045+ return stbi__errpuc("not GIF", "Image was not as a gif type.");
7046+ }
7047+}
7048+
7049+static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
7050+{
7051+ stbi_uc *u = 0;
7052+ stbi__gif g;
7053+ memset(&g, 0, sizeof(g));
7054+ STBI_NOTUSED(ri);
7055+
7056+ u = stbi__gif_load_next(s, &g, comp, req_comp, 0);
7057+ if (u == (stbi_uc *) s) u = 0; // end of animated gif marker
7058+ if (u) {
7059+ *x = g.w;
7060+ *y = g.h;
7061+
7062+ // moved conversion to after successful load so that the same
7063+ // can be done for multiple frames.
7064+ if (req_comp && req_comp != 4)
7065+ u = stbi__convert_format(u, 4, req_comp, g.w, g.h);
7066+ } else if (g.out) {
7067+ // if there was an error and we allocated an image buffer, free it!
7068+ STBI_FREE(g.out);
7069+ }
7070+
7071+ // free buffers needed for multiple frame loading;
7072+ STBI_FREE(g.history);
7073+ STBI_FREE(g.background);
7074+
7075+ return u;
7076+}
7077+
7078+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp)
7079+{
7080+ return stbi__gif_info_raw(s,x,y,comp);
7081+}
7082+#endif
7083+
7084+// *************************************************************************************************
7085+// Radiance RGBE HDR loader
7086+// originally by Nicolas Schulz
7087+#ifndef STBI_NO_HDR
7088+static int stbi__hdr_test_core(stbi__context *s, const char *signature)
7089+{
7090+ int i;
7091+ for (i=0; signature[i]; ++i)
7092+ if (stbi__get8(s) != signature[i])
7093+ return 0;
7094+ stbi__rewind(s);
7095+ return 1;
7096+}
7097+
7098+static int stbi__hdr_test(stbi__context* s)
7099+{
7100+ int r = stbi__hdr_test_core(s, "#?RADIANCE\n");
7101+ stbi__rewind(s);
7102+ if(!r) {
7103+ r = stbi__hdr_test_core(s, "#?RGBE\n");
7104+ stbi__rewind(s);
7105+ }
7106+ return r;
7107+}
7108+
7109+#define STBI__HDR_BUFLEN 1024
7110+static char *stbi__hdr_gettoken(stbi__context *z, char *buffer)
7111+{
7112+ int len=0;
7113+ char c = '\0';
7114+
7115+ c = (char) stbi__get8(z);
7116+
7117+ while (!stbi__at_eof(z) && c != '\n') {
7118+ buffer[len++] = c;
7119+ if (len == STBI__HDR_BUFLEN-1) {
7120+ // flush to end of line
7121+ while (!stbi__at_eof(z) && stbi__get8(z) != '\n')
7122+ ;
7123+ break;
7124+ }
7125+ c = (char) stbi__get8(z);
7126+ }
7127+
7128+ buffer[len] = 0;
7129+ return buffer;
7130+}
7131+
7132+static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp)
7133+{
7134+ if ( input[3] != 0 ) {
7135+ float f1;
7136+ // Exponent
7137+ f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
7138+ if (req_comp <= 2)
7139+ output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
7140+ else {
7141+ output[0] = input[0] * f1;
7142+ output[1] = input[1] * f1;
7143+ output[2] = input[2] * f1;
7144+ }
7145+ if (req_comp == 2) output[1] = 1;
7146+ if (req_comp == 4) output[3] = 1;
7147+ } else {
7148+ switch (req_comp) {
7149+ case 4: output[3] = 1; /* fallthrough */
7150+ case 3: output[0] = output[1] = output[2] = 0;
7151+ break;
7152+ case 2: output[1] = 1; /* fallthrough */
7153+ case 1: output[0] = 0;
7154+ break;
7155+ }
7156+ }
7157+}
7158+
7159+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
7160+{
7161+ char buffer[STBI__HDR_BUFLEN];
7162+ char *token;
7163+ int valid = 0;
7164+ int width, height;
7165+ stbi_uc *scanline;
7166+ float *hdr_data;
7167+ int len;
7168+ unsigned char count, value;
7169+ int i, j, k, c1,c2, z;
7170+ const char *headerToken;
7171+ STBI_NOTUSED(ri);
7172+
7173+ // Check identifier
7174+ headerToken = stbi__hdr_gettoken(s,buffer);
7175+ if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0)
7176+ return stbi__errpf("not HDR", "Corrupt HDR image");
7177+
7178+ // Parse header
7179+ for(;;) {
7180+ token = stbi__hdr_gettoken(s,buffer);
7181+ if (token[0] == 0) break;
7182+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
7183+ }
7184+
7185+ if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format");
7186+
7187+ // Parse width and height
7188+ // can't use sscanf() if we're not using stdio!
7189+ token = stbi__hdr_gettoken(s,buffer);
7190+ if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format");
7191+ token += 3;
7192+ height = (int) strtol(token, &token, 10);
7193+ while (*token == ' ') ++token;
7194+ if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format");
7195+ token += 3;
7196+ width = (int) strtol(token, NULL, 10);
7197+
7198+ if (height > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)");
7199+ if (width > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)");
7200+
7201+ *x = width;
7202+ *y = height;
7203+
7204+ if (comp) *comp = 3;
7205+ if (req_comp == 0) req_comp = 3;
7206+
7207+ if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0))
7208+ return stbi__errpf("too large", "HDR image is too large");
7209+
7210+ // Read data
7211+ hdr_data = (float *) stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0);
7212+ if (!hdr_data)
7213+ return stbi__errpf("outofmem", "Out of memory");
7214+
7215+ // Load image data
7216+ // image data is stored as some number of sca
7217+ if ( width < 8 || width >= 32768) {
7218+ // Read flat data
7219+ for (j=0; j < height; ++j) {
7220+ for (i=0; i < width; ++i) {
7221+ stbi_uc rgbe[4];
7222+ main_decode_loop:
7223+ stbi__getn(s, rgbe, 4);
7224+ stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
7225+ }
7226+ }
7227+ } else {
7228+ // Read RLE-encoded data
7229+ scanline = NULL;
7230+
7231+ for (j = 0; j < height; ++j) {
7232+ c1 = stbi__get8(s);
7233+ c2 = stbi__get8(s);
7234+ len = stbi__get8(s);
7235+ if (c1 != 2 || c2 != 2 || (len & 0x80)) {
7236+ // not run-length encoded, so we have to actually use THIS data as a decoded
7237+ // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
7238+ stbi_uc rgbe[4];
7239+ rgbe[0] = (stbi_uc) c1;
7240+ rgbe[1] = (stbi_uc) c2;
7241+ rgbe[2] = (stbi_uc) len;
7242+ rgbe[3] = (stbi_uc) stbi__get8(s);
7243+ stbi__hdr_convert(hdr_data, rgbe, req_comp);
7244+ i = 1;
7245+ j = 0;
7246+ STBI_FREE(scanline);
7247+ goto main_decode_loop; // yes, this makes no sense
7248+ }
7249+ len <<= 8;
7250+ len |= stbi__get8(s);
7251+ if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); }
7252+ if (scanline == NULL) {
7253+ scanline = (stbi_uc *) stbi__malloc_mad2(width, 4, 0);
7254+ if (!scanline) {
7255+ STBI_FREE(hdr_data);
7256+ return stbi__errpf("outofmem", "Out of memory");
7257+ }
7258+ }
7259+
7260+ for (k = 0; k < 4; ++k) {
7261+ int nleft;
7262+ i = 0;
7263+ while ((nleft = width - i) > 0) {
7264+ count = stbi__get8(s);
7265+ if (count > 128) {
7266+ // Run
7267+ value = stbi__get8(s);
7268+ count -= 128;
7269+ if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
7270+ for (z = 0; z < count; ++z)
7271+ scanline[i++ * 4 + k] = value;
7272+ } else {
7273+ // Dump
7274+ if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
7275+ for (z = 0; z < count; ++z)
7276+ scanline[i++ * 4 + k] = stbi__get8(s);
7277+ }
7278+ }
7279+ }
7280+ for (i=0; i < width; ++i)
7281+ stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
7282+ }
7283+ if (scanline)
7284+ STBI_FREE(scanline);
7285+ }
7286+
7287+ return hdr_data;
7288+}
7289+
7290+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp)
7291+{
7292+ char buffer[STBI__HDR_BUFLEN];
7293+ char *token;
7294+ int valid = 0;
7295+ int dummy;
7296+
7297+ if (!x) x = &dummy;
7298+ if (!y) y = &dummy;
7299+ if (!comp) comp = &dummy;
7300+
7301+ if (stbi__hdr_test(s) == 0) {
7302+ stbi__rewind( s );
7303+ return 0;
7304+ }
7305+
7306+ for(;;) {
7307+ token = stbi__hdr_gettoken(s,buffer);
7308+ if (token[0] == 0) break;
7309+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
7310+ }
7311+
7312+ if (!valid) {
7313+ stbi__rewind( s );
7314+ return 0;
7315+ }
7316+ token = stbi__hdr_gettoken(s,buffer);
7317+ if (strncmp(token, "-Y ", 3)) {
7318+ stbi__rewind( s );
7319+ return 0;
7320+ }
7321+ token += 3;
7322+ *y = (int) strtol(token, &token, 10);
7323+ while (*token == ' ') ++token;
7324+ if (strncmp(token, "+X ", 3)) {
7325+ stbi__rewind( s );
7326+ return 0;
7327+ }
7328+ token += 3;
7329+ *x = (int) strtol(token, NULL, 10);
7330+ *comp = 3;
7331+ return 1;
7332+}
7333+#endif // STBI_NO_HDR
7334+
7335+#ifndef STBI_NO_BMP
7336+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
7337+{
7338+ void *p;
7339+ stbi__bmp_data info;
7340+
7341+ info.all_a = 255;
7342+ p = stbi__bmp_parse_header(s, &info);
7343+ if (p == NULL) {
7344+ stbi__rewind( s );
7345+ return 0;
7346+ }
7347+ if (x) *x = s->img_x;
7348+ if (y) *y = s->img_y;
7349+ if (comp) {
7350+ if (info.bpp == 24 && info.ma == 0xff000000)
7351+ *comp = 3;
7352+ else
7353+ *comp = info.ma ? 4 : 3;
7354+ }
7355+ return 1;
7356+}
7357+#endif
7358+
7359+#ifndef STBI_NO_PSD
7360+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
7361+{
7362+ int channelCount, dummy, depth;
7363+ if (!x) x = &dummy;
7364+ if (!y) y = &dummy;
7365+ if (!comp) comp = &dummy;
7366+ if (stbi__get32be(s) != 0x38425053) {
7367+ stbi__rewind( s );
7368+ return 0;
7369+ }
7370+ if (stbi__get16be(s) != 1) {
7371+ stbi__rewind( s );
7372+ return 0;
7373+ }
7374+ stbi__skip(s, 6);
7375+ channelCount = stbi__get16be(s);
7376+ if (channelCount < 0 || channelCount > 16) {
7377+ stbi__rewind( s );
7378+ return 0;
7379+ }
7380+ *y = stbi__get32be(s);
7381+ *x = stbi__get32be(s);
7382+ depth = stbi__get16be(s);
7383+ if (depth != 8 && depth != 16) {
7384+ stbi__rewind( s );
7385+ return 0;
7386+ }
7387+ if (stbi__get16be(s) != 3) {
7388+ stbi__rewind( s );
7389+ return 0;
7390+ }
7391+ *comp = 4;
7392+ return 1;
7393+}
7394+
7395+static int stbi__psd_is16(stbi__context *s)
7396+{
7397+ int channelCount, depth;
7398+ if (stbi__get32be(s) != 0x38425053) {
7399+ stbi__rewind( s );
7400+ return 0;
7401+ }
7402+ if (stbi__get16be(s) != 1) {
7403+ stbi__rewind( s );
7404+ return 0;
7405+ }
7406+ stbi__skip(s, 6);
7407+ channelCount = stbi__get16be(s);
7408+ if (channelCount < 0 || channelCount > 16) {
7409+ stbi__rewind( s );
7410+ return 0;
7411+ }
7412+ STBI_NOTUSED(stbi__get32be(s));
7413+ STBI_NOTUSED(stbi__get32be(s));
7414+ depth = stbi__get16be(s);
7415+ if (depth != 16) {
7416+ stbi__rewind( s );
7417+ return 0;
7418+ }
7419+ return 1;
7420+}
7421+#endif
7422+
7423+#ifndef STBI_NO_PIC
7424+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp)
7425+{
7426+ int act_comp=0,num_packets=0,chained,dummy;
7427+ stbi__pic_packet packets[10];
7428+
7429+ if (!x) x = &dummy;
7430+ if (!y) y = &dummy;
7431+ if (!comp) comp = &dummy;
7432+
7433+ if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) {
7434+ stbi__rewind(s);
7435+ return 0;
7436+ }
7437+
7438+ stbi__skip(s, 88);
7439+
7440+ *x = stbi__get16be(s);
7441+ *y = stbi__get16be(s);
7442+ if (stbi__at_eof(s)) {
7443+ stbi__rewind( s);
7444+ return 0;
7445+ }
7446+ if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
7447+ stbi__rewind( s );
7448+ return 0;
7449+ }
7450+
7451+ stbi__skip(s, 8);
7452+
7453+ do {
7454+ stbi__pic_packet *packet;
7455+
7456+ if (num_packets==sizeof(packets)/sizeof(packets[0]))
7457+ return 0;
7458+
7459+ packet = &packets[num_packets++];
7460+ chained = stbi__get8(s);
7461+ packet->size = stbi__get8(s);
7462+ packet->type = stbi__get8(s);
7463+ packet->channel = stbi__get8(s);
7464+ act_comp |= packet->channel;
7465+
7466+ if (stbi__at_eof(s)) {
7467+ stbi__rewind( s );
7468+ return 0;
7469+ }
7470+ if (packet->size != 8) {
7471+ stbi__rewind( s );
7472+ return 0;
7473+ }
7474+ } while (chained);
7475+
7476+ *comp = (act_comp & 0x10 ? 4 : 3);
7477+
7478+ return 1;
7479+}
7480+#endif
7481+
7482+// *************************************************************************************************
7483+// Portable Gray Map and Portable Pixel Map loader
7484+// by Ken Miller
7485+//
7486+// PGM: http://netpbm.sourceforge.net/doc/pgm.html
7487+// PPM: http://netpbm.sourceforge.net/doc/ppm.html
7488+//
7489+// Known limitations:
7490+// Does not support comments in the header section
7491+// Does not support ASCII image data (formats P2 and P3)
7492+
7493+#ifndef STBI_NO_PNM
7494+
7495+static int stbi__pnm_test(stbi__context *s)
7496+{
7497+ char p, t;
7498+ p = (char) stbi__get8(s);
7499+ t = (char) stbi__get8(s);
7500+ if (p != 'P' || (t != '5' && t != '6')) {
7501+ stbi__rewind( s );
7502+ return 0;
7503+ }
7504+ return 1;
7505+}
7506+
7507+static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
7508+{
7509+ stbi_uc *out;
7510+ STBI_NOTUSED(ri);
7511+
7512+ ri->bits_per_channel = stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n);
7513+ if (ri->bits_per_channel == 0)
7514+ return 0;
7515+
7516+ if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
7517+ if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
7518+
7519+ *x = s->img_x;
7520+ *y = s->img_y;
7521+ if (comp) *comp = s->img_n;
7522+
7523+ if (!stbi__mad4sizes_valid(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0))
7524+ return stbi__errpuc("too large", "PNM too large");
7525+
7526+ out = (stbi_uc *) stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0);
7527+ if (!out) return stbi__errpuc("outofmem", "Out of memory");
7528+ if (!stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8))) {
7529+ STBI_FREE(out);
7530+ return stbi__errpuc("bad PNM", "PNM file truncated");
7531+ }
7532+
7533+ if (req_comp && req_comp != s->img_n) {
7534+ if (ri->bits_per_channel == 16) {
7535+ out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, s->img_n, req_comp, s->img_x, s->img_y);
7536+ } else {
7537+ out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
7538+ }
7539+ if (out == NULL) return out; // stbi__convert_format frees input on failure
7540+ }
7541+ return out;
7542+}
7543+
7544+static int stbi__pnm_isspace(char c)
7545+{
7546+ return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
7547+}
7548+
7549+static void stbi__pnm_skip_whitespace(stbi__context *s, char *c)
7550+{
7551+ for (;;) {
7552+ while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
7553+ *c = (char) stbi__get8(s);
7554+
7555+ if (stbi__at_eof(s) || *c != '#')
7556+ break;
7557+
7558+ while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' )
7559+ *c = (char) stbi__get8(s);
7560+ }
7561+}
7562+
7563+static int stbi__pnm_isdigit(char c)
7564+{
7565+ return c >= '0' && c <= '9';
7566+}
7567+
7568+static int stbi__pnm_getinteger(stbi__context *s, char *c)
7569+{
7570+ int value = 0;
7571+
7572+ while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
7573+ value = value*10 + (*c - '0');
7574+ *c = (char) stbi__get8(s);
7575+ if((value > 214748364) || (value == 214748364 && *c > '7'))
7576+ return stbi__err("integer parse overflow", "Parsing an integer in the PPM header overflowed a 32-bit int");
7577+ }
7578+
7579+ return value;
7580+}
7581+
7582+static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
7583+{
7584+ int maxv, dummy;
7585+ char c, p, t;
7586+
7587+ if (!x) x = &dummy;
7588+ if (!y) y = &dummy;
7589+ if (!comp) comp = &dummy;
7590+
7591+ stbi__rewind(s);
7592+
7593+ // Get identifier
7594+ p = (char) stbi__get8(s);
7595+ t = (char) stbi__get8(s);
7596+ if (p != 'P' || (t != '5' && t != '6')) {
7597+ stbi__rewind(s);
7598+ return 0;
7599+ }
7600+
7601+ *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm
7602+
7603+ c = (char) stbi__get8(s);
7604+ stbi__pnm_skip_whitespace(s, &c);
7605+
7606+ *x = stbi__pnm_getinteger(s, &c); // read width
7607+ if(*x == 0)
7608+ return stbi__err("invalid width", "PPM image header had zero or overflowing width");
7609+ stbi__pnm_skip_whitespace(s, &c);
7610+
7611+ *y = stbi__pnm_getinteger(s, &c); // read height
7612+ if (*y == 0)
7613+ return stbi__err("invalid width", "PPM image header had zero or overflowing width");
7614+ stbi__pnm_skip_whitespace(s, &c);
7615+
7616+ maxv = stbi__pnm_getinteger(s, &c); // read max value
7617+ if (maxv > 65535)
7618+ return stbi__err("max value > 65535", "PPM image supports only 8-bit and 16-bit images");
7619+ else if (maxv > 255)
7620+ return 16;
7621+ else
7622+ return 8;
7623+}
7624+
7625+static int stbi__pnm_is16(stbi__context *s)
7626+{
7627+ if (stbi__pnm_info(s, NULL, NULL, NULL) == 16)
7628+ return 1;
7629+ return 0;
7630+}
7631+#endif
7632+
7633+static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
7634+{
7635+ #ifndef STBI_NO_JPEG
7636+ if (stbi__jpeg_info(s, x, y, comp)) return 1;
7637+ #endif
7638+
7639+ #ifndef STBI_NO_PNG
7640+ if (stbi__png_info(s, x, y, comp)) return 1;
7641+ #endif
7642+
7643+ #ifndef STBI_NO_GIF
7644+ if (stbi__gif_info(s, x, y, comp)) return 1;
7645+ #endif
7646+
7647+ #ifndef STBI_NO_BMP
7648+ if (stbi__bmp_info(s, x, y, comp)) return 1;
7649+ #endif
7650+
7651+ #ifndef STBI_NO_PSD
7652+ if (stbi__psd_info(s, x, y, comp)) return 1;
7653+ #endif
7654+
7655+ #ifndef STBI_NO_PIC
7656+ if (stbi__pic_info(s, x, y, comp)) return 1;
7657+ #endif
7658+
7659+ #ifndef STBI_NO_PNM
7660+ if (stbi__pnm_info(s, x, y, comp)) return 1;
7661+ #endif
7662+
7663+ #ifndef STBI_NO_HDR
7664+ if (stbi__hdr_info(s, x, y, comp)) return 1;
7665+ #endif
7666+
7667+ // test tga last because it's a crappy test!
7668+ #ifndef STBI_NO_TGA
7669+ if (stbi__tga_info(s, x, y, comp))
7670+ return 1;
7671+ #endif
7672+ return stbi__err("unknown image type", "Image not of any known type, or corrupt");
7673+}
7674+
7675+static int stbi__is_16_main(stbi__context *s)
7676+{
7677+ #ifndef STBI_NO_PNG
7678+ if (stbi__png_is16(s)) return 1;
7679+ #endif
7680+
7681+ #ifndef STBI_NO_PSD
7682+ if (stbi__psd_is16(s)) return 1;
7683+ #endif
7684+
7685+ #ifndef STBI_NO_PNM
7686+ if (stbi__pnm_is16(s)) return 1;
7687+ #endif
7688+ return 0;
7689+}
7690+
7691+#ifndef STBI_NO_STDIO
7692+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
7693+{
7694+ FILE *f = stbi__fopen(filename, "rb");
7695+ int result;
7696+ if (!f) return stbi__err("can't fopen", "Unable to open file");
7697+ result = stbi_info_from_file(f, x, y, comp);
7698+ fclose(f);
7699+ return result;
7700+}
7701+
7702+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
7703+{
7704+ int r;
7705+ stbi__context s;
7706+ long pos = ftell(f);
7707+ stbi__start_file(&s, f);
7708+ r = stbi__info_main(&s,x,y,comp);
7709+ fseek(f,pos,SEEK_SET);
7710+ return r;
7711+}
7712+
7713+STBIDEF int stbi_is_16_bit(char const *filename)
7714+{
7715+ FILE *f = stbi__fopen(filename, "rb");
7716+ int result;
7717+ if (!f) return stbi__err("can't fopen", "Unable to open file");
7718+ result = stbi_is_16_bit_from_file(f);
7719+ fclose(f);
7720+ return result;
7721+}
7722+
7723+STBIDEF int stbi_is_16_bit_from_file(FILE *f)
7724+{
7725+ int r;
7726+ stbi__context s;
7727+ long pos = ftell(f);
7728+ stbi__start_file(&s, f);
7729+ r = stbi__is_16_main(&s);
7730+ fseek(f,pos,SEEK_SET);
7731+ return r;
7732+}
7733+#endif // !STBI_NO_STDIO
7734+
7735+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
7736+{
7737+ stbi__context s;
7738+ stbi__start_mem(&s,buffer,len);
7739+ return stbi__info_main(&s,x,y,comp);
7740+}
7741+
7742+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
7743+{
7744+ stbi__context s;
7745+ stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
7746+ return stbi__info_main(&s,x,y,comp);
7747+}
7748+
7749+STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len)
7750+{
7751+ stbi__context s;
7752+ stbi__start_mem(&s,buffer,len);
7753+ return stbi__is_16_main(&s);
7754+}
7755+
7756+STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user)
7757+{
7758+ stbi__context s;
7759+ stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
7760+ return stbi__is_16_main(&s);
7761+}
7762+
7763+#endif // STB_IMAGE_IMPLEMENTATION
7764+
7765+/*
7766+ revision history:
7767+ 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs
7768+ 2.19 (2018-02-11) fix warning
7769+ 2.18 (2018-01-30) fix warnings
7770+ 2.17 (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug
7771+ 1-bit BMP
7772+ *_is_16_bit api
7773+ avoid warnings
7774+ 2.16 (2017-07-23) all functions have 16-bit variants;
7775+ STBI_NO_STDIO works again;
7776+ compilation fixes;
7777+ fix rounding in unpremultiply;
7778+ optimize vertical flip;
7779+ disable raw_len validation;
7780+ documentation fixes
7781+ 2.15 (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode;
7782+ warning fixes; disable run-time SSE detection on gcc;
7783+ uniform handling of optional "return" values;
7784+ thread-safe initialization of zlib tables
7785+ 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
7786+ 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now
7787+ 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
7788+ 2.11 (2016-04-02) allocate large structures on the stack
7789+ remove white matting for transparent PSD
7790+ fix reported channel count for PNG & BMP
7791+ re-enable SSE2 in non-gcc 64-bit
7792+ support RGB-formatted JPEG
7793+ read 16-bit PNGs (only as 8-bit)
7794+ 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED
7795+ 2.09 (2016-01-16) allow comments in PNM files
7796+ 16-bit-per-pixel TGA (not bit-per-component)
7797+ info() for TGA could break due to .hdr handling
7798+ info() for BMP to shares code instead of sloppy parse
7799+ can use STBI_REALLOC_SIZED if allocator doesn't support realloc
7800+ code cleanup
7801+ 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
7802+ 2.07 (2015-09-13) fix compiler warnings
7803+ partial animated GIF support
7804+ limited 16-bpc PSD support
7805+ #ifdef unused functions
7806+ bug with < 92 byte PIC,PNM,HDR,TGA
7807+ 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value
7808+ 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning
7809+ 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit
7810+ 2.03 (2015-04-12) extra corruption checking (mmozeiko)
7811+ stbi_set_flip_vertically_on_load (nguillemot)
7812+ fix NEON support; fix mingw support
7813+ 2.02 (2015-01-19) fix incorrect assert, fix warning
7814+ 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2
7815+ 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
7816+ 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg)
7817+ progressive JPEG (stb)
7818+ PGM/PPM support (Ken Miller)
7819+ STBI_MALLOC,STBI_REALLOC,STBI_FREE
7820+ GIF bugfix -- seemingly never worked
7821+ STBI_NO_*, STBI_ONLY_*
7822+ 1.48 (2014-12-14) fix incorrectly-named assert()
7823+ 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb)
7824+ optimize PNG (ryg)
7825+ fix bug in interlaced PNG with user-specified channel count (stb)
7826+ 1.46 (2014-08-26)
7827+ fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG
7828+ 1.45 (2014-08-16)
7829+ fix MSVC-ARM internal compiler error by wrapping malloc
7830+ 1.44 (2014-08-07)
7831+ various warning fixes from Ronny Chevalier
7832+ 1.43 (2014-07-15)
7833+ fix MSVC-only compiler problem in code changed in 1.42
7834+ 1.42 (2014-07-09)
7835+ don't define _CRT_SECURE_NO_WARNINGS (affects user code)
7836+ fixes to stbi__cleanup_jpeg path
7837+ added STBI_ASSERT to avoid requiring assert.h
7838+ 1.41 (2014-06-25)
7839+ fix search&replace from 1.36 that messed up comments/error messages
7840+ 1.40 (2014-06-22)
7841+ fix gcc struct-initialization warning
7842+ 1.39 (2014-06-15)
7843+ fix to TGA optimization when req_comp != number of components in TGA;
7844+ fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite)
7845+ add support for BMP version 5 (more ignored fields)
7846+ 1.38 (2014-06-06)
7847+ suppress MSVC warnings on integer casts truncating values
7848+ fix accidental rename of 'skip' field of I/O
7849+ 1.37 (2014-06-04)
7850+ remove duplicate typedef
7851+ 1.36 (2014-06-03)
7852+ convert to header file single-file library
7853+ if de-iphone isn't set, load iphone images color-swapped instead of returning NULL
7854+ 1.35 (2014-05-27)
7855+ various warnings
7856+ fix broken STBI_SIMD path
7857+ fix bug where stbi_load_from_file no longer left file pointer in correct place
7858+ fix broken non-easy path for 32-bit BMP (possibly never used)
7859+ TGA optimization by Arseny Kapoulkine
7860+ 1.34 (unknown)
7861+ use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case
7862+ 1.33 (2011-07-14)
7863+ make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements
7864+ 1.32 (2011-07-13)
7865+ support for "info" function for all supported filetypes (SpartanJ)
7866+ 1.31 (2011-06-20)
7867+ a few more leak fixes, bug in PNG handling (SpartanJ)
7868+ 1.30 (2011-06-11)
7869+ added ability to load files via callbacks to accomidate custom input streams (Ben Wenger)
7870+ removed deprecated format-specific test/load functions
7871+ removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway
7872+ error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha)
7873+ fix inefficiency in decoding 32-bit BMP (David Woo)
7874+ 1.29 (2010-08-16)
7875+ various warning fixes from Aurelien Pocheville
7876+ 1.28 (2010-08-01)
7877+ fix bug in GIF palette transparency (SpartanJ)
7878+ 1.27 (2010-08-01)
7879+ cast-to-stbi_uc to fix warnings
7880+ 1.26 (2010-07-24)
7881+ fix bug in file buffering for PNG reported by SpartanJ
7882+ 1.25 (2010-07-17)
7883+ refix trans_data warning (Won Chun)
7884+ 1.24 (2010-07-12)
7885+ perf improvements reading from files on platforms with lock-heavy fgetc()
7886+ minor perf improvements for jpeg
7887+ deprecated type-specific functions so we'll get feedback if they're needed
7888+ attempt to fix trans_data warning (Won Chun)
7889+ 1.23 fixed bug in iPhone support
7890+ 1.22 (2010-07-10)
7891+ removed image *writing* support
7892+ stbi_info support from Jetro Lauha
7893+ GIF support from Jean-Marc Lienher
7894+ iPhone PNG-extensions from James Brown
7895+ warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva)
7896+ 1.21 fix use of 'stbi_uc' in header (reported by jon blow)
7897+ 1.20 added support for Softimage PIC, by Tom Seddon
7898+ 1.19 bug in interlaced PNG corruption check (found by ryg)
7899+ 1.18 (2008-08-02)
7900+ fix a threading bug (local mutable static)
7901+ 1.17 support interlaced PNG
7902+ 1.16 major bugfix - stbi__convert_format converted one too many pixels
7903+ 1.15 initialize some fields for thread safety
7904+ 1.14 fix threadsafe conversion bug
7905+ header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
7906+ 1.13 threadsafe
7907+ 1.12 const qualifiers in the API
7908+ 1.11 Support installable IDCT, colorspace conversion routines
7909+ 1.10 Fixes for 64-bit (don't use "unsigned long")
7910+ optimized upsampling by Fabian "ryg" Giesen
7911+ 1.09 Fix format-conversion for PSD code (bad global variables!)
7912+ 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz
7913+ 1.07 attempt to fix C++ warning/errors again
7914+ 1.06 attempt to fix C++ warning/errors again
7915+ 1.05 fix TGA loading to return correct *comp and use good luminance calc
7916+ 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free
7917+ 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR
7918+ 1.02 support for (subset of) HDR files, float interface for preferred access to them
7919+ 1.01 fix bug: possible bug in handling right-side up bmps... not sure
7920+ fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all
7921+ 1.00 interface to zlib that skips zlib header
7922+ 0.99 correct handling of alpha in palette
7923+ 0.98 TGA loader by lonesock; dynamically add loaders (untested)
7924+ 0.97 jpeg errors on too large a file; also catch another malloc failure
7925+ 0.96 fix detection of invalid v value - particleman@mollyrocket forum
7926+ 0.95 during header scan, seek to markers in case of padding
7927+ 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same
7928+ 0.93 handle jpegtran output; verbose errors
7929+ 0.92 read 4,8,16,24,32-bit BMP files of several formats
7930+ 0.91 output 24-bit Windows 3.0 BMP files
7931+ 0.90 fix a few more warnings; bump version number to approach 1.0
7932+ 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd
7933+ 0.60 fix compiling as c++
7934+ 0.59 fix warnings: merge Dave Moore's -Wall fixes
7935+ 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian
7936+ 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available
7937+ 0.56 fix bug: zlib uncompressed mode len vs. nlen
7938+ 0.55 fix bug: restart_interval not initialized to 0
7939+ 0.54 allow NULL for 'int *comp'
7940+ 0.53 fix bug in png 3->4; speedup png decoding
7941+ 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments
7942+ 0.51 obey req_comp requests, 1-component jpegs return as 1-component,
7943+ on 'test' only check type, not whether we support this variant
7944+ 0.50 (2006-11-19)
7945+ first released version
7946+*/
7947+
7948+
7949+/*
7950+------------------------------------------------------------------------------
7951+This software is available under 2 licenses -- choose whichever you prefer.
7952+------------------------------------------------------------------------------
7953+ALTERNATIVE A - MIT License
7954+Copyright (c) 2017 Sean Barrett
7955+Permission is hereby granted, free of charge, to any person obtaining a copy of
7956+this software and associated documentation files (the "Software"), to deal in
7957+the Software without restriction, including without limitation the rights to
7958+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
7959+of the Software, and to permit persons to whom the Software is furnished to do
7960+so, subject to the following conditions:
7961+The above copyright notice and this permission notice shall be included in all
7962+copies or substantial portions of the Software.
7963+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
7964+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
7965+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
7966+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
7967+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
7968+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
7969+SOFTWARE.
7970+------------------------------------------------------------------------------
7971+ALTERNATIVE B - Public Domain (www.unlicense.org)
7972+This is free and unencumbered software released into the public domain.
7973+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
7974+software, either in source code form or as a compiled binary, for any purpose,
7975+commercial or non-commercial, and by any means.
7976+In jurisdictions that recognize copyright laws, the author or authors of this
7977+software dedicate any and all copyright interest in the software to the public
7978+domain. We make this dedication for the benefit of the public at large and to
7979+the detriment of our heirs and successors. We intend this dedication to be an
7980+overt act of relinquishment in perpetuity of all present and future rights to
7981+this software under copyright law.
7982+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
7983+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
7984+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
7985+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
7986+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
7987+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
7988+------------------------------------------------------------------------------
7989+*/
D
swc
+0,
-1
1@@ -1 +0,0 @@
2-Subproject commit 19893a5ca3239082b904a04fdb9ac7c3a1fb62e2