compositor: add a masking mechanism to weston_layer
this adds a mechanism to mask the views belonging to a layer
to an arbitrary rect, in the global space. The parts that don't fit
in that rect will be clipped away.
Supported by the gl and pixman renderer only for now.
diff --git a/src/gl-renderer.c b/src/gl-renderer.c
index 63af75d..f7f29b3 100644
--- a/src/gl-renderer.c
+++ b/src/gl-renderer.c
@@ -542,7 +542,7 @@
pixman_region32_init(&repaint);
pixman_region32_intersect(&repaint,
- &ev->transform.boundingbox, damage);
+ &ev->transform.masked_boundingbox, damage);
pixman_region32_subtract(&repaint, &repaint, &ev->clip);
if (!pixman_region32_not_empty(&repaint))