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