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rootston: damage tracking scale support

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emersion 2018-01-25 19:15:20 +01:00
parent 3f96427d08
commit 4223fbc763
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GPG key ID: 0FDE7BE0E88F5E48
4 changed files with 45 additions and 3 deletions
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2
util/meson.build
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@ -3,6 +3,8 @@ lib_wlr_util = static_library(
files(
'log.c',
'os-compatibility.c',
'region.c',
),
include_directories: wlr_inc,
dependencies: [pixman],
)

29
util/region.c Normal file
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@ -0,0 +1,29 @@
#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);
}