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Fix damage tracking for rotated surfaces

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It was broken because the damage extents were rotated about its
own center, not about the center of the surface.

This adds a new wlr_region_rotated_bounds that rotates regions.
This allows us to have only one code path (for both non-rotated
views and rotated views) and optimizes rendering for rotated
views.
This commit is contained in:
emersion 2018-03-26 15:31:08 -04:00
parent bcb74c2c78
commit 4555fc8a54
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GPG key ID: 0FDE7BE0E88F5E48
4 changed files with 76 additions and 26 deletions
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49
util/region.c
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@ -128,3 +128,52 @@ void wlr_region_expand(pixman_region32_t *dst, pixman_region32_t *src,
pixman_region32_init_rects(dst, dst_rects, nrects);
free(dst_rects);
}
void wlr_region_rotated_bounds(pixman_region32_t *dst, pixman_region32_t *src,
float rotation, int ox, int oy) {
if (rotation == 0) {
pixman_region32_copy(dst, src);
return;
}
int nrects;
pixman_box32_t *src_rects = pixman_region32_rectangles(src, &nrects);
pixman_box32_t *dst_rects = malloc(nrects * sizeof(pixman_box32_t));
if (dst_rects == NULL) {
return;
}
for (int i = 0; i < nrects; ++i) {
double x1 = src_rects[i].x1 - ox;
double y1 = src_rects[i].y1 - oy;
double x2 = src_rects[i].x2 - ox;
double y2 = src_rects[i].y2 - oy;
double rx1 = x1 * cos(rotation) - y1 * sin(rotation);
double ry1 = x1 * sin(rotation) + y1 * cos(rotation);
double rx2 = x2 * cos(rotation) - y1 * sin(rotation);
double ry2 = x2 * sin(rotation) + y1 * cos(rotation);
double rx3 = x2 * cos(rotation) - y2 * sin(rotation);
double ry3 = x2 * sin(rotation) + y2 * cos(rotation);
double rx4 = x1 * cos(rotation) - y2 * sin(rotation);
double ry4 = x1 * sin(rotation) + y2 * cos(rotation);
x1 = fmin(fmin(rx1, rx2), fmin(rx3, rx4));
y1 = fmin(fmin(ry1, ry2), fmin(ry3, ry4));
x2 = fmax(fmax(rx1, rx2), fmax(rx3, rx4));
y2 = fmax(fmax(ry1, ry2), fmax(ry3, ry4));
dst_rects[i].x1 = floor(ox + x1);
dst_rects[i].x2 = ceil(ox + x2);
dst_rects[i].y1 = floor(oy + y1);
dst_rects[i].y2 = ceil(oy + y2);
}
pixman_region32_fini(dst);
pixman_region32_init_rects(dst, dst_rects, nrects);
free(dst_rects);
}