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Add pixman region utils

pull/6/head
Andri Yngvason 2022-04-02 12:49:41 +00:00
parent 80d18ac6aa
commit 545be152ce
2 changed files with 94 additions and 0 deletions
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include/region.h 100644
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/*
* Copyright (c) 2022 Andri Yngvason
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#pragma once
struct pixman_region16;
void region_scale(struct pixman_region16* dst, struct pixman_region16* src,
double scale);
void region_translate(struct pixman_region16* dst, struct pixman_region16* src,
int x, int y);

70
src/region.c 100644
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/*
* Copyright (c) 2022 Andri Yngvason
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <math.h>
#include <pixman.h>
void region_scale(struct pixman_region16* dst, struct pixman_region16* src,
double scale)
{
if (scale == 1.0) {
pixman_region_copy(dst, src);
return;
}
pixman_region_fini(dst);
pixman_region_init(dst);
int n_rects = 0;
pixman_box16_t* rects = pixman_region_rectangles(src, &n_rects);
for (int i = 0; i < n_rects; ++i) {
pixman_box16_t* r = &rects[i];
int x1 = floor((double)r->x1 * scale);
int x2 = ceil((double)r->x2 * scale);
int y1 = floor((double)r->y1 * scale);
int y2 = ceil((double)r->y2 * scale);
pixman_region_union_rect(dst, dst, x1, y1, x2 - x1, y2 - y1);
}
}
void region_translate(struct pixman_region16* dst, struct pixman_region16* src,
int x, int y)
{
if (x == 0 && y == 0) {
pixman_region_copy(dst, src);
return;
}
pixman_region_fini(dst);
pixman_region_init(dst);
int n_rects = 0;
pixman_box16_t* rects = pixman_region_rectangles(src, &n_rects);
for (int i = 0; i < n_rects; ++i) {
pixman_box16_t* r = &rects[i];
int x1 = r->x1 + x;
int x2 = r->x2 + x;
int y1 = r->y1 + y;
int y2 = r->y2 + y;
pixman_region_union_rect(dst, dst, x1, y1, x2 - x1, y2 - y1);
}
}