wlroots/util/region.c

30 lines
746 B
C

#include <stdlib.h>
#include <math.h>
#include <wlr/util/region.h>
void wlr_region_scale(pixman_region32_t *dst, pixman_region32_t *src,
float scale) {
if (scale == 1) {
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) {
dst_rects[i].x1 = floor(src_rects[i].x1 * scale);
dst_rects[i].x2 = ceil(src_rects[i].x2 * scale);
dst_rects[i].y1 = floor(src_rects[i].y1 * scale);
dst_rects[i].y2 = ceil(src_rects[i].y2 * scale);
}
pixman_region32_fini(dst);
pixman_region32_init_rects(dst, dst_rects, nrects);
}