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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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11
render/pass.c
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@ -134,6 +134,8 @@ static void legacy_add_rect(struct wlr_render_pass *wlr_pass,
pixman_region32_t clip;
get_clip_region(pass, options->clip, &clip);
pixman_region32_intersect_rect(&clip, &clip,
options->box.x, options->box.y, options->box.width, options->box.height);
float color[4] = {
options->color.r,
@ -146,7 +148,14 @@ static void legacy_add_rect(struct wlr_render_pass *wlr_pass,
const pixman_box32_t *rects = pixman_region32_rectangles(&clip, &rects_len);
for (int i = 0; i < rects_len; i++) {
scissor(pass->renderer, &rects[i]);
wlr_render_quad_with_matrix(pass->renderer, color, matrix);
switch (options->blend_mode) {
case WLR_RENDER_BLEND_MODE_PREMULTIPLIED:
wlr_render_quad_with_matrix(pass->renderer, color, matrix);
break;
case WLR_RENDER_BLEND_MODE_NONE:
wlr_renderer_clear(pass->renderer, color);
break;
}
}
wlr_renderer_scissor(pass->renderer, NULL);