Merge pull request #571 from emersion/output-damage

Output damage tracking

2 files changed, 132 insertions, 0 deletions

diff --git a/util/meson.build b/util/meson.build
index 21930693..34aa428b 100644
--- a/util/meson.build
+++ b/util/meson.build
@@ -3,6 +3,8 @@ lib_wlr_util = static_library(
 	files(
 		'log.c',
 		'os-compatibility.c',
+		'region.c',
 	),
 	include_directories: wlr_inc,
+	dependencies: [wayland_server, pixman],
 )
diff --git a/util/region.c b/util/region.c
new file mode 100644
index 00000000..1bde0cb8
--- /dev/null
+++ b/util/region.c
@@ -0,0 +1,130 @@
+#include <stdlib.h>
+#include <math.h>
+#include <wlr/util/region.h>
+
+void wlr_region_scale(pixman_region32_t *dst, pixman_region32_t *src,
+		float scale) {
+	if (scale == 1) {
+		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 = floor(src_rects[i].x1 * scale);
+		dst_rects[i].x2 = ceil(src_rects[i].x2 * scale);
+		dst_rects[i].y1 = floor(src_rects[i].y1 * scale);
+		dst_rects[i].y2 = ceil(src_rects[i].y2 * scale);
+	}
+
+	pixman_region32_fini(dst);
+	pixman_region32_init_rects(dst, dst_rects, nrects);
+	free(dst_rects);
+}
+
+void wlr_region_transform(pixman_region32_t *dst, pixman_region32_t *src,
+		enum wl_output_transform transform, int width, int height) {
+	if (transform == WL_OUTPUT_TRANSFORM_NORMAL) {
+		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) {
+		switch (transform) {
+		case WL_OUTPUT_TRANSFORM_NORMAL:
+			dst_rects[i].x1 = src_rects[i].x1;
+			dst_rects[i].y1 = src_rects[i].y1;
+			dst_rects[i].x2 = src_rects[i].x2;
+			dst_rects[i].y2 = src_rects[i].y2;
+			break;
+		case WL_OUTPUT_TRANSFORM_90:
+			dst_rects[i].x1 = src_rects[i].y1;
+			dst_rects[i].y1 = width - src_rects[i].x2;
+			dst_rects[i].x2 = src_rects[i].y2;
+			dst_rects[i].y2 = width - src_rects[i].x1;
+			break;
+		case WL_OUTPUT_TRANSFORM_180:
+			dst_rects[i].x1 = width - src_rects[i].x2;
+			dst_rects[i].y1 = height - src_rects[i].y2;
+			dst_rects[i].x2 = width - src_rects[i].x1;
+			dst_rects[i].y2 = height - src_rects[i].y1;
+			break;
+		case WL_OUTPUT_TRANSFORM_270:
+			dst_rects[i].x1 = height - src_rects[i].y2;
+			dst_rects[i].y1 = src_rects[i].x1;
+			dst_rects[i].x2 = height - src_rects[i].y1;
+			dst_rects[i].y2 = src_rects[i].x2;
+			break;
+		case WL_OUTPUT_TRANSFORM_FLIPPED:
+			dst_rects[i].x1 = width - src_rects[i].x2;
+			dst_rects[i].y1 = src_rects[i].y1;
+			dst_rects[i].x2 = width - src_rects[i].x1;
+			dst_rects[i].y2 = src_rects[i].y2;
+			break;
+		case WL_OUTPUT_TRANSFORM_FLIPPED_90:
+			dst_rects[i].x1 = height - src_rects[i].y2;
+			dst_rects[i].y1 = width - src_rects[i].x2;
+			dst_rects[i].x2 = height - src_rects[i].y1;
+			dst_rects[i].y2 = width - src_rects[i].x1;
+			break;
+		case WL_OUTPUT_TRANSFORM_FLIPPED_180:
+			dst_rects[i].x1 = src_rects[i].x1;
+			dst_rects[i].y1 = height - src_rects[i].y2;
+			dst_rects[i].x2 = src_rects[i].x2;
+			dst_rects[i].y2 = height - src_rects[i].y1;
+			break;
+		case WL_OUTPUT_TRANSFORM_FLIPPED_270:
+			dst_rects[i].x1 = src_rects[i].y1;
+			dst_rects[i].y1 = src_rects[i].x1;
+			dst_rects[i].x2 = src_rects[i].y2;
+			dst_rects[i].y2 = src_rects[i].x2;
+			break;
+		}
+	}
+
+	pixman_region32_fini(dst);
+	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);
+}