Only reduce the clip if it is not in active use for the operation

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 9 insertions, 3 deletions

diff --git a/src/cairo-composite-rectangles-private.h b/src/cairo-composite-rectangles-private.h
index c6dac3092..dd5bd4156 100644
--- a/src/cairo-composite-rectangles-private.h
+++ b/src/cairo-composite-rectangles-private.h
@@ -53,11 +53,13 @@ CAIRO_BEGIN_DECLS
 struct _cairo_composite_rectangles {
     cairo_rectangle_int_t source;
     cairo_rectangle_int_t mask;
-    cairo_rectangle_int_t bounded; /* dst */
-    cairo_rectangle_int_t unbounded; /* clip */
+    cairo_rectangle_int_t destination;
+
+    cairo_rectangle_int_t bounded; /* source? IN mask? IN unbounded */
+    cairo_rectangle_int_t unbounded; /* destination IN clip */
     uint32_t is_bounded;
 
-    cairo_clip_t *clip;
+    cairo_clip_t *clip; /* clip will be reduced to the minimal container */
 };
 
 cairo_private cairo_int_status_t
@@ -108,6 +110,10 @@ cairo_private cairo_int_status_t
 _cairo_composite_rectangles_intersect_mask_extents (cairo_composite_rectangles_t *extents,
 						    const cairo_box_t *box);
 
+cairo_private cairo_bool_t
+_cairo_composite_rectangles_can_reduce_clip (cairo_composite_rectangles_t *composite,
+					     cairo_clip_t *clip);
+
 cairo_private void
 _cairo_composite_rectangles_fini (cairo_composite_rectangles_t *extents);