commit 10c9dd9

add lines

1@@ -63,6 +63,7 @@ static const struct wld_renderer_impl wld_renderer_impl = {
2 	.copy_region = &default_copy_region,
3 #endif
4 	.draw_circle = &wld_draw_circle,
5+	.draw_line = &wld_draw_line,
6 	.draw_text = &renderer_draw_text,
7 	.flush = &renderer_flush,
8 	.destroy = &renderer_destroy

 1@@ -188,6 +188,35 @@ wld_draw_circle(struct wld_renderer *renderer, uint32_t color,
 2 	}
 3 }
 4 
 5+EXPORT
 6+void
 7+wld_draw_line(struct wld_renderer *renderer, uint32_t color,
 8+			 int32_t x1, int32_t y1, int32_t x2, int32_t y2)
 9+{
10+	int32_t dx = abs(x2-x1),  sx = x1<x2 ? 1 : -1;
11+	int32_t dy = -abs(y2-y1), sy = y1<y2 ? 1 : -1;
12+	int32_t err = dx+dy, e2;
13+
14+	while(true) {
15+		renderer->impl->fill_rectangle(renderer, color, x1, y1, 1, 1);
16+
17+		if (x1==x2 && y1==y2)
18+			break;
19+		
20+		e2 = 2*err;
21+		
22+		if (e2 >= dy) {
23+			err += dy;
24+			x1 += sx;
25+		}
26+
27+		if (e2 <= dx) {
28+			err += dx;
29+			y1 += sy;
30+		}
31+	}
32+}
33+
34 EXPORT
35 void
36 wld_draw_text(struct wld_renderer *renderer,

1@@ -110,6 +110,8 @@ struct wld_renderer_impl {
2 	                    pixman_region32_t *region);
3 	void (*draw_circle)(struct wld_renderer *renderer, uint32_t color,
4 				int32_t x, int32_t y, uint32_t r, bool fill);
5+	void (*draw_line)(struct wld_renderer *renderer, uint32_t color,
6+			 int32_t x1, int32_t y1, int32_t x2, int32_t y2);
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@@ -254,7 +254,10 @@ void wld_copy_region(struct wld_renderer *renderer,
 2                      int32_t dst_x, int32_t dst_y, pixman_region32_t *region);
 3 
 4 void wld_draw_circle(struct wld_renderer *renderer, uint32_t color,
 5-				int32_t x, int32_t y, uint32_t r, bool fill); 
 6+				int32_t x, int32_t y, uint32_t r, bool fill);
 7+
 8+void wld_draw_line(struct wld_renderer *renderer, uint32_t color,
 9+			 int32_t x1, int32_t y1, int32_t x2, int32_t y2);
10 
11 /**
12  * Draw a UTF-8 text string to the given buffer.