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render: introduce blend mode

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Allow callers to pick the blend mode when rendering a rect. The
"none" mode can be used to disable blending and clear rects.
This commit is contained in:
Simon Ser 2023-05-02 21:32:51 +02:00
parent 6b7d1d732a
commit a93fc8afd6
3 changed files with 34 additions and 2 deletions
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13
render/pixman/pass.c
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@ -143,6 +143,17 @@ static void render_pass_add_rect(struct wlr_render_pass *wlr_pass,
struct wlr_pixman_buffer *buffer = pass->buffer;
struct wlr_box box = options->box;
pixman_op_t op = 0;
switch (options->blend_mode) {
case WLR_RENDER_BLEND_MODE_PREMULTIPLIED:
op = options->color.a == 1 ? PIXMAN_OP_SRC : PIXMAN_OP_OVER;
break;
case WLR_RENDER_BLEND_MODE_NONE:
op = PIXMAN_OP_SRC;
break;
}
assert(op != 0);
struct pixman_color color = {
.red = options->color.r * 0xFFFF,
.green = options->color.g * 0xFFFF,
@ -153,7 +164,7 @@ static void render_pass_add_rect(struct wlr_render_pass *wlr_pass,
pixman_image_t *fill = pixman_image_create_solid_fill(&color);
pixman_image_set_clip_region32(buffer->image, (pixman_region32_t *)options->clip);
pixman_image_composite32(PIXMAN_OP_OVER, fill, NULL, buffer->image,
pixman_image_composite32(op, fill, NULL, buffer->image,
0, 0, 0, 0, box.x, box.y, box.width, box.height);
pixman_image_set_clip_region32(buffer->image, NULL);