surface: fix non-buffer damage handling

This commit fixes the way the damage that doesn't come directly from the
client is handled.

1 files changed, 9 insertions, 3 deletions

diff --git a/include/wlr/types/wlr_surface.h b/include/wlr/types/wlr_surface.h
index ae3ae80f..4255a1f2 100644
--- a/include/wlr/types/wlr_surface.h
+++ b/include/wlr/types/wlr_surface.h
@@ -112,6 +112,11 @@ struct wlr_surface {
 	 */
 	pixman_region32_t buffer_damage;
 	/**
+	 * The last commit's damage caused by surface and its subsurfaces'
+	 * movement, in surface-local coordinates.
+	 */
+	pixman_region32_t external_damage;
+	/**
 	 * The current opaque region, in surface-local coordinates. It is clipped to
 	 * the surface bounds. If the surface's buffer is using a fully opaque
 	 * format, this is set to the whole surface.
@@ -273,9 +278,10 @@ void wlr_surface_for_each_surface(struct wlr_surface *surface,
 	wlr_surface_iterator_func_t iterator, void *user_data);
 
 /**
- * Get the effective damage to the surface in terms of surface local
- * coordinates. This includes damage induced by resizing and moving the
- * surface. The damage is not expected to be bounded by the surface itself.
+ * Get the effective surface damage in surface-local coordinate space. Besides
+ * buffer damage, this includes damage induced by resizing and moving the
+ * surface and its subsurfaces. The resulting damage is not expected to be
+ * bounded by the surface itself.
  */
 void wlr_surface_get_effective_damage(struct wlr_surface *surface,
 	pixman_region32_t *damage);