Move region transformation code to weston_transformed_region
Both the Pixman renderer and the X11 backend contained effectively the same
region transformation code. This commit adds a weston_transformed_region
function and changes pixman-renderer and compositor-x11 to use it.
Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
diff --git a/src/compositor.c b/src/compositor.c
index 7b87a9f..134793c 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -543,6 +543,98 @@
}
WL_EXPORT void
+weston_transformed_region(int width, int height,
+ enum wl_output_transform transform,
+ int32_t scale,
+ pixman_region32_t *src, pixman_region32_t *dest)
+{
+ pixman_box32_t *src_rects, *dest_rects;
+ int nrects, i;
+
+ if (transform == WL_OUTPUT_TRANSFORM_NORMAL && scale == 1) {
+ if (src != dest)
+ pixman_region32_copy(dest, src);
+ return;
+ }
+
+ src_rects = pixman_region32_rectangles(src, &nrects);
+ dest_rects = malloc(nrects * sizeof(*dest_rects));
+ if (!dest_rects)
+ return;
+
+ if (transform == WL_OUTPUT_TRANSFORM_NORMAL) {
+ memcpy(dest_rects, src_rects, nrects * sizeof(*dest_rects));
+ } else {
+ for (i = 0; i < nrects; i++) {
+ switch (transform) {
+ default:
+ case WL_OUTPUT_TRANSFORM_NORMAL:
+ dest_rects[i].x1 = src_rects[i].x1;
+ dest_rects[i].y1 = src_rects[i].y1;
+ dest_rects[i].x2 = src_rects[i].x2;
+ dest_rects[i].y2 = src_rects[i].y2;
+ break;
+ case WL_OUTPUT_TRANSFORM_90:
+ dest_rects[i].x1 = height - src_rects[i].y2;
+ dest_rects[i].y1 = src_rects[i].x1;
+ dest_rects[i].x2 = height - src_rects[i].y1;
+ dest_rects[i].y2 = src_rects[i].x2;
+ break;
+ case WL_OUTPUT_TRANSFORM_180:
+ dest_rects[i].x1 = width - src_rects[i].x2;
+ dest_rects[i].y1 = height - src_rects[i].y2;
+ dest_rects[i].x2 = width - src_rects[i].x1;
+ dest_rects[i].y2 = height - src_rects[i].y1;
+ break;
+ case WL_OUTPUT_TRANSFORM_270:
+ dest_rects[i].x1 = src_rects[i].y1;
+ dest_rects[i].y1 = width - src_rects[i].x2;
+ dest_rects[i].x2 = src_rects[i].y2;
+ dest_rects[i].y2 = width - src_rects[i].x1;
+ break;
+ case WL_OUTPUT_TRANSFORM_FLIPPED:
+ dest_rects[i].x1 = width - src_rects[i].x2;
+ dest_rects[i].y1 = src_rects[i].y1;
+ dest_rects[i].x2 = width - src_rects[i].x1;
+ dest_rects[i].y2 = src_rects[i].y2;
+ break;
+ case WL_OUTPUT_TRANSFORM_FLIPPED_90:
+ dest_rects[i].x1 = height - src_rects[i].y2;
+ dest_rects[i].y1 = width - src_rects[i].x2;
+ dest_rects[i].x2 = height - src_rects[i].y1;
+ dest_rects[i].y2 = width - src_rects[i].x1;
+ break;
+ case WL_OUTPUT_TRANSFORM_FLIPPED_180:
+ dest_rects[i].x1 = src_rects[i].x1;
+ dest_rects[i].y1 = height - src_rects[i].y2;
+ dest_rects[i].x2 = src_rects[i].x2;
+ dest_rects[i].y2 = height - src_rects[i].y1;
+ break;
+ case WL_OUTPUT_TRANSFORM_FLIPPED_270:
+ dest_rects[i].x1 = src_rects[i].y1;
+ dest_rects[i].y1 = src_rects[i].x1;
+ dest_rects[i].x2 = src_rects[i].y2;
+ dest_rects[i].y2 = src_rects[i].x2;
+ break;
+ }
+ }
+ }
+
+ if (scale != 1) {
+ for (i = 0; i < nrects; i++) {
+ dest_rects[i].x1 *= scale;
+ dest_rects[i].x2 *= scale;
+ dest_rects[i].y1 *= scale;
+ dest_rects[i].y2 *= scale;
+ }
+ }
+
+ pixman_region32_clear(dest);
+ pixman_region32_init_rects(dest, dest_rects, nrects);
+ free(dest_rects);
+}
+
+WL_EXPORT void
weston_surface_to_buffer_float(struct weston_surface *surface,
float sx, float sy, float *bx, float *by)
{