scene: Don't rely on return value of wlr_damage_ring_add

types/scene/wlr_scene.c

@@ -335,10 +335,20 @@ static void transform_output_box(struct wlr_box *box, const struct render_data *
 
 static void scene_output_damage(struct wlr_scene_output *scene_output,
 		const pixman_region32_t *region) {
-	if (wlr_damage_ring_add(&scene_output->damage_ring, region)) {
 	int width, height;
 	wlr_output_transformed_resolution(scene_output->output, &width, &height);
 
+	pixman_region32_t clipped;
+	pixman_region32_init(&clipped);
+	pixman_region32_intersect_rect(&clipped, region, 0, 0, width, height);
+
+	if (!pixman_region32_not_empty(&clipped)) {
+		pixman_region32_fini(&clipped);
+		return;
+	}
+
+	wlr_damage_ring_add(&scene_output->damage_ring, &clipped);
+	pixman_region32_fini(&clipped);
 	wlr_output_schedule_frame(scene_output->output);
 
 	struct wlr_output *output = scene_output->output;
@@ -355,13 +365,13 @@ static void scene_output_damage(struct wlr_scene_output *scene_output,
 		&scene_output->pending_commit_damage, 0, 0, output->width, output->height);
 	pixman_region32_fini(&frame_damage);
 }
-}
 
 static void scene_output_damage_whole(struct wlr_scene_output *scene_output) {
-	struct wlr_damage_ring *ring = &scene_output->damage_ring;
+	int width, height;
+	wlr_output_transformed_resolution(scene_output->output, &width, &height);
 
 	pixman_region32_t damage;
-	pixman_region32_init_rect(&damage, 0, 0, ring->width, ring->height);
+	pixman_region32_init_rect(&damage, 0, 0, width, height);
 	scene_output_damage(scene_output, &damage);
 	pixman_region32_fini(&damage);
 }