wlr_scene_set_buffer_with_damage: Only damage the visible parts of the node

types/scene/wlr_scene.c

@@ -577,6 +577,14 @@ void wlr_scene_buffer_set_buffer_with_damage(struct wlr_scene_buffer *scene_buff
 		pixman_region32_init(&output_damage);
 		wlr_region_scale_xy(&output_damage, &trans_damage,
 			output_scale * scale_x, output_scale * scale_y);
+
+		pixman_region32_t cull_region;
+		pixman_region32_init(&cull_region);
+		wlr_region_scale(&cull_region, &scene_buffer->node.visible, output_scale);
+		pixman_region32_translate(&cull_region, -lx * output_scale, -ly * output_scale);
+		pixman_region32_intersect(&output_damage, &output_damage, &cull_region);
+		pixman_region32_fini(&cull_region);
+
 		pixman_region32_translate(&output_damage,
 			(lx - scene_output->x) * output_scale,
 			(ly - scene_output->y) * output_scale);