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util/region: add fractional region helpers

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Signed-off-by: Loukas Agorgianitis <loukas@agorgianitis.com>
This commit is contained in:
Loukas Agorgianitis 2025-04-28 17:49:36 +03:00
parent f6ee38c67e
commit 2ab8f41750
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GPG key ID: DDC6FA7D5BB332E6
2 changed files with 73 additions and 0 deletions
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25
include/wlr/util/region.h
View file

@ -44,6 +44,31 @@ void wlr_region_scale(pixman_region32_t *dst, const pixman_region32_t *src,
void wlr_region_scale_xy(pixman_region32_t *dst, const pixman_region32_t *src,
float scale_x, float scale_y);
/**
* Scale a fractional region by the specified factor.
*
* The resulting coordinates are rounded to nearest integer.
*
* Also see wlr_region_scalef_xy().
*/
void wlr_region_scalef(pixman_region32_t *dst, const pixman_region64f_t *src,
float scale);
/**
* Scale a region by the specified factors.
*
* The X and Y coordinates are scaled separately by scale_x and scale_y.
*
* The resulting coordinates are rounded to nearest integer.
*/
void wlr_region_scalef_xy(pixman_region32_t *dst, const pixman_region64f_t *src,
float scale_x, float scale_y);
/**
* Copy an integer region into a fractional region.
*/
void wlr_region64f_copy_from_region32(pixman_region64f_t *dst, const pixman_region32_t *src);
/**
* Applies a transform to a region inside a box of size `width` x `height`.
*/

48
util/region.c
View file

@ -36,6 +36,54 @@ void wlr_region_scale_xy(pixman_region32_t *dst, const pixman_region32_t *src,
free(dst_rects);
}
void wlr_region_scalef(pixman_region32_t *dst, const pixman_region64f_t *src,
float scale) {
wlr_region_scalef_xy(dst, src, scale, scale);
}
void wlr_region_scalef_xy(pixman_region32_t *dst, const pixman_region64f_t *src,
float scale_x, float scale_y) {
int nrects;
const pixman_box64f_t *src_rects = pixman_region64f_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 = round(src_rects[i].x1 * scale_x);
dst_rects[i].x2 = round(src_rects[i].x2 * scale_x);
dst_rects[i].y1 = round(src_rects[i].y1 * scale_y);
dst_rects[i].y2 = round(src_rects[i].y2 * scale_y);
}
pixman_region32_fini(dst);
pixman_region32_init_rects(dst, dst_rects, nrects);
free(dst_rects);
}
void wlr_region64f_copy_from_region32(pixman_region64f_t *dst, const pixman_region32_t *src) {
int nrects;
const pixman_box32_t *src_rects = pixman_region32_rectangles(src, &nrects);
pixman_box64f_t *dst_rects = malloc(nrects * sizeof(pixman_box64f_t));
if (dst_rects == NULL) {
return;
}
for (int i = 0; i < nrects; ++i) {
dst_rects[i].x1 = src_rects[i].x1;
dst_rects[i].x2 = src_rects[i].x2;
dst_rects[i].y1 = src_rects[i].y1;
dst_rects[i].y2 = src_rects[i].y2;
}
pixman_region64f_fini(dst);
pixman_region64f_init_rects(dst, dst_rects, nrects);
free(dst_rects);
}
void wlr_region_transform(pixman_region32_t *dst, const pixman_region32_t *src,
enum wl_output_transform transform, int width, int height) {
if (transform == WL_OUTPUT_TRANSFORM_NORMAL) {