commit 49ced8d

add circle rendering and shit

 1@@ -33,6 +33,7 @@ static void renderer_copy_rectangle(struct wld_renderer *renderer,
 2                                     int32_t dst_x, int32_t dst_y,
 3                                     int32_t src_x, int32_t src_y,
 4                                     uint32_t width, uint32_t height);
 5+
 6 #ifdef RENDERER_IMPLEMENTS_REGION
 7 static void renderer_fill_region(struct wld_renderer *base, uint32_t color,
 8                                  pixman_region32_t *region);
 9@@ -61,6 +62,7 @@ static const struct wld_renderer_impl wld_renderer_impl = {
10 	.fill_region = &default_fill_region,
11 	.copy_region = &default_copy_region,
12 #endif
13+	.draw_circle = &wld_draw_circle,
14 	.draw_text = &renderer_draw_text,
15 	.flush = &renderer_flush,
16 	.destroy = &renderer_destroy

 1@@ -139,6 +139,55 @@ wld_copy_region(struct wld_renderer *renderer,
 2 	                            dst_x, dst_y, region);
 3 }
 4 
 5+
 6+/* https://en.wikipedia.org/wiki/Midpoint_circle_algorithm :wq*/
 7+static void
 8+circle_points(struct wld_renderer *renderer, uint32_t color,
 9+			 int32_t x1, int32_t y1, int32_t x2, int32_t y2, bool fill)
10+{
11+	/* hacky */
12+	if (fill) {
13+		renderer->impl->fill_rectangle(renderer, color, x1-x2, y1+y2, 2*x2 + 1, 1);
14+		renderer->impl->fill_rectangle(renderer, color, x1-x2, y1-y2, 2*x2 + 1, 1);
15+		renderer->impl->fill_rectangle(renderer, color, x1-y2, y1+x2, 2*y2 + 1, 1);
16+		renderer->impl->fill_rectangle(renderer, color, x1-y2, y1-x2, 2*y2 + 1, 1);
17+	}
18+	
19+	else {
20+		renderer->impl->fill_rectangle(renderer, color, x1+x2, y1+y2, 1, 1);
21+		renderer->impl->fill_rectangle(renderer, color, x1-x2, y1+y2, 1, 1);
22+		renderer->impl->fill_rectangle(renderer, color, x1+x2, y1-y2, 1, 1);
23+		renderer->impl->fill_rectangle(renderer, color, x1-x2, y1-y2, 1, 1);
24+		renderer->impl->fill_rectangle(renderer, color, x1+y2, y1+x2, 1, 1);
25+		renderer->impl->fill_rectangle(renderer, color, x1-y2, y1+x2, 1, 1);
26+		renderer->impl->fill_rectangle(renderer, color, x1+y2, y1-x2, 1, 1);
27+		renderer->impl->fill_rectangle(renderer, color, x1-y2, y1-x2, 1, 1);
28+	}
29+}
30+
31+EXPORT
32+void
33+wld_draw_circle(struct wld_renderer *renderer, uint32_t color, 
34+				int32_t x, int32_t y, uint32_t r, bool fill)
35+{
36+	int32_t x1 = 0, y1 = r;
37+	int32_t d = 3 - 2 * r;
38+	circle_points(renderer, color, x, y, x1, y1, fill);
39+
40+	while (y1 >= x1) {
41+		if (d > 0) {
42+			y1--;
43+			d = d + 4 * (x1 - y1) + 10;
44+		}
45+		else
46+			d = d + 4 * x1 + 6;
47+
48+		x1++;
49+
50+		circle_points(renderer, color, x, y, x1, y1, fill);
51+	}
52+}
53+
54 EXPORT
55 void
56 wld_draw_text(struct wld_renderer *renderer,

1@@ -108,6 +108,8 @@ struct wld_renderer_impl {
2 	void (*copy_region)(struct wld_renderer *renderer, struct buffer *src,
3 	                    int32_t dst_x, int32_t dst_y,
4 	                    pixman_region32_t *region);
5+	void (*draw_circle)(struct wld_renderer *renderer, uint32_t color,
6+				int32_t x, int32_t y, uint32_t r, bool fill);
7 	void (*draw_text)(struct wld_renderer *renderer,
8 	                  struct font *font, uint32_t color,
9 	                  int32_t x, int32_t y, const char *text, uint32_t length,

 1@@ -253,6 +253,9 @@ void wld_copy_region(struct wld_renderer *renderer,
 2                      struct wld_buffer *buffer,
 3                      int32_t dst_x, int32_t dst_y, pixman_region32_t *region);
 4 
 5+void wld_draw_circle(struct wld_renderer *renderer, uint32_t color,
 6+				int32_t x, int32_t y, uint32_t r, bool fill); 
 7+
 8 /**
 9  * Draw a UTF-8 text string to the given buffer.
10  *