131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
#include <stdlib.h>
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#include <math.h>
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#include <wlr/util/region.h>
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void wlr_region_scale(pixman_region32_t *dst, pixman_region32_t *src,
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float scale) {
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if (scale == 1) {
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pixman_region32_copy(dst, src);
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return;
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}
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int nrects;
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pixman_box32_t *src_rects = pixman_region32_rectangles(src, &nrects);
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pixman_box32_t *dst_rects = malloc(nrects * sizeof(pixman_box32_t));
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if (dst_rects == NULL) {
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return;
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}
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for (int i = 0; i < nrects; ++i) {
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dst_rects[i].x1 = floor(src_rects[i].x1 * scale);
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dst_rects[i].x2 = ceil(src_rects[i].x2 * scale);
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dst_rects[i].y1 = floor(src_rects[i].y1 * scale);
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dst_rects[i].y2 = ceil(src_rects[i].y2 * scale);
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}
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pixman_region32_fini(dst);
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pixman_region32_init_rects(dst, dst_rects, nrects);
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free(dst_rects);
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}
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void wlr_region_transform(pixman_region32_t *dst, pixman_region32_t *src,
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enum wl_output_transform transform, int width, int height) {
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if (transform == WL_OUTPUT_TRANSFORM_NORMAL) {
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pixman_region32_copy(dst, src);
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return;
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}
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int nrects;
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pixman_box32_t *src_rects = pixman_region32_rectangles(src, &nrects);
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pixman_box32_t *dst_rects = malloc(nrects * sizeof(pixman_box32_t));
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if (dst_rects == NULL) {
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return;
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}
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for (int i = 0; i < nrects; ++i) {
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switch (transform) {
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case WL_OUTPUT_TRANSFORM_NORMAL:
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dst_rects[i].x1 = src_rects[i].x1;
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dst_rects[i].y1 = src_rects[i].y1;
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dst_rects[i].x2 = src_rects[i].x2;
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dst_rects[i].y2 = src_rects[i].y2;
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break;
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case WL_OUTPUT_TRANSFORM_90:
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dst_rects[i].x1 = src_rects[i].y1;
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dst_rects[i].y1 = width - src_rects[i].x2;
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dst_rects[i].x2 = src_rects[i].y2;
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dst_rects[i].y2 = width - src_rects[i].x1;
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break;
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case WL_OUTPUT_TRANSFORM_180:
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dst_rects[i].x1 = width - src_rects[i].x2;
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dst_rects[i].y1 = height - src_rects[i].y2;
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dst_rects[i].x2 = width - src_rects[i].x1;
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dst_rects[i].y2 = height - src_rects[i].y1;
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break;
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case WL_OUTPUT_TRANSFORM_270:
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dst_rects[i].x1 = height - src_rects[i].y2;
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dst_rects[i].y1 = src_rects[i].x1;
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dst_rects[i].x2 = height - src_rects[i].y1;
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dst_rects[i].y2 = src_rects[i].x2;
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break;
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case WL_OUTPUT_TRANSFORM_FLIPPED:
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dst_rects[i].x1 = width - src_rects[i].x2;
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dst_rects[i].y1 = src_rects[i].y1;
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dst_rects[i].x2 = width - src_rects[i].x1;
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dst_rects[i].y2 = src_rects[i].y2;
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break;
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case WL_OUTPUT_TRANSFORM_FLIPPED_90:
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dst_rects[i].x1 = height - src_rects[i].y2;
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dst_rects[i].y1 = width - src_rects[i].x2;
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dst_rects[i].x2 = height - src_rects[i].y1;
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dst_rects[i].y2 = width - src_rects[i].x1;
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break;
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case WL_OUTPUT_TRANSFORM_FLIPPED_180:
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dst_rects[i].x1 = src_rects[i].x1;
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dst_rects[i].y1 = height - src_rects[i].y2;
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dst_rects[i].x2 = src_rects[i].x2;
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dst_rects[i].y2 = height - src_rects[i].y1;
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break;
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case WL_OUTPUT_TRANSFORM_FLIPPED_270:
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dst_rects[i].x1 = src_rects[i].y1;
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dst_rects[i].y1 = src_rects[i].x1;
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dst_rects[i].x2 = src_rects[i].y2;
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dst_rects[i].y2 = src_rects[i].x2;
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break;
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}
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}
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pixman_region32_fini(dst);
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pixman_region32_init_rects(dst, dst_rects, nrects);
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free(dst_rects);
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}
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void wlr_region_expand(pixman_region32_t *dst, pixman_region32_t *src,
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int distance) {
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if (distance == 0) {
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pixman_region32_copy(dst, src);
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return;
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}
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int nrects;
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pixman_box32_t *src_rects = pixman_region32_rectangles(src, &nrects);
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pixman_box32_t *dst_rects = malloc(nrects * sizeof(pixman_box32_t));
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if (dst_rects == NULL) {
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return;
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}
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for (int i = 0; i < nrects; ++i) {
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dst_rects[i].x1 = src_rects[i].x1 - distance;
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dst_rects[i].x2 = src_rects[i].x2 + distance;
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dst_rects[i].y1 = src_rects[i].y1 - distance;
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dst_rects[i].y2 = src_rects[i].y2 + distance;
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}
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pixman_region32_fini(dst);
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pixman_region32_init_rects(dst, dst_rects, nrects);
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free(dst_rects);
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}
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