1/* wld: buffer.c
  2 *
  3 * Copyright (c) 2013, 2014 Michael Forney
  4 *
  5 * Permission is hereby granted, free of charge, to any person obtaining a copy
  6 * of this software and associated documentation files (the "Software"), to deal
  7 * in the Software without restriction, including without limitation the rights
  8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  9 * copies of the Software, and to permit persons to whom the Software is
 10 * furnished to do so, subject to the following conditions:
 11 *
 12 * The above copyright notice and this permission notice shall be included in
 13 * all copies or substantial portions of the Software.
 14 *
 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 21 * SOFTWARE.
 22 */
 23
 24#include "wld-private.h"
 25
 26void
 27buffer_initialize(struct buffer *buffer,
 28                  const struct wld_buffer_impl *impl,
 29                  uint32_t width, uint32_t height,
 30                  uint32_t format, uint32_t pitch)
 31{
 32	*((const struct wld_buffer_impl **)&buffer->base.impl) = impl;
 33	buffer->base.width = width;
 34	buffer->base.height = height;
 35	buffer->base.format = format;
 36	buffer->base.pitch = pitch;
 37	buffer->base.map = NULL;
 38	buffer->ref = 1;
 39	buffer->map_ref = 0;
 40	buffer->exporters = NULL;
 41	buffer->destructors = NULL;
 42	pixman_region32_init_rect(&buffer->base.damage, 0, 0, width, height);
 43}
 44
 45EXPORT
 46bool
 47wld_map(struct wld_buffer *base)
 48{
 49	struct buffer *buffer = (void *)base;
 50
 51	if (buffer->map_ref == 0 && !buffer->base.impl->map(buffer))
 52		return false;
 53
 54	++buffer->map_ref;
 55	return true;
 56}
 57
 58EXPORT
 59bool
 60wld_unmap(struct wld_buffer *base)
 61{
 62	struct buffer *buffer = (void *)base;
 63
 64	if (buffer->map_ref == 0 || (buffer->map_ref == 1 && !buffer->base.impl->unmap(buffer)))
 65		return false;
 66
 67	--buffer->map_ref;
 68	return true;
 69}
 70
 71EXPORT
 72bool
 73wld_export(struct wld_buffer *base, uint32_t type, union wld_object *object)
 74{
 75	struct buffer *buffer = (void *)base;
 76	struct wld_exporter *exporter;
 77
 78	for (exporter = buffer->exporters; exporter; exporter = exporter->next) {
 79		if (exporter->export(exporter, &buffer->base, type, object))
 80			return true;
 81	}
 82
 83	return false;
 84}
 85
 86EXPORT
 87void
 88wld_buffer_add_exporter(struct wld_buffer *base, struct wld_exporter *exporter)
 89{
 90	struct buffer *buffer = (void *)base;
 91
 92	exporter->next = buffer->exporters;
 93	buffer->exporters = exporter;
 94}
 95
 96EXPORT
 97void
 98wld_buffer_add_destructor(struct wld_buffer *base, struct wld_destructor *destructor)
 99{
100	struct buffer *buffer = (void *)base;
101
102	destructor->next = buffer->destructors;
103	buffer->destructors = destructor;
104}
105
106EXPORT
107void
108wld_buffer_reference(struct wld_buffer *base)
109{
110	struct buffer *buffer = (void *)base;
111
112	++buffer->ref;
113}
114
115EXPORT
116void
117wld_buffer_unreference(struct wld_buffer *base)
118{
119	struct buffer *buffer = (void *)base;
120	struct wld_destructor *destructor, *next;
121
122	if (--buffer->ref > 0)
123		return;
124
125	pixman_region32_fini(&buffer->base.damage);
126
127	for (destructor = buffer->destructors; destructor; destructor = next) {
128		next = destructor->next;
129		destructor->destroy(destructor);
130	}
131
132	if (buffer->map_ref > 0)
133		buffer->base.impl->unmap(buffer);
134
135	buffer->base.impl->destroy(buffer);
136}