rootston: fix urxvt damage on HiDPI outputs

util/region: add wlr_region_expand

1 files changed, 27 insertions, 0 deletions

diff --git a/util/region.c b/util/region.c
index 9c4712f9..1bde0cb8 100644
--- a/util/region.c
+++ b/util/region.c
@@ -101,3 +101,30 @@ void wlr_region_transform(pixman_region32_t *dst, pixman_region32_t *src,
 	pixman_region32_init_rects(dst, dst_rects, nrects);
 	free(dst_rects);
 }
+
+void wlr_region_expand(pixman_region32_t *dst, pixman_region32_t *src,
+		int distance) {
+	if (distance == 0) {
+		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 = src_rects[i].x1 - distance;
+		dst_rects[i].x2 = src_rects[i].x2 + distance;
+		dst_rects[i].y1 = src_rects[i].y1 - distance;
+		dst_rects[i].y2 = src_rects[i].y2 + distance;
+	}
+
+	pixman_region32_fini(dst);
+	pixman_region32_init_rects(dst, dst_rects, nrects);
+	free(dst_rects);
+}