pixman_image_composite: Reduce opaque masks to NULL

When the mask is known to be opaque, we might as well reduce it to
NULL to take advantage of the various fast paths that operate on NULL
masks.

diff --git a/pixman/pixman.c b/pixman/pixman.c
index e3b6516..e0ccd87 100644 (file)
--- a/pixman/pixman.c
+++ b/pixman/pixman.c
@@ -587,7 +587,7 @@ pixman_image_composite32 (pixman_op_t      op,
     src_format = src->common.extended_format_code;
     src_flags = src->common.flags;
 
-    if (mask)
+    if (mask && !(mask->common.flags & FAST_PATH_IS_OPAQUE))
     {
        mask_format = mask->common.extended_format_code;
        mask_flags = mask->common.flags;