From: Søren Sandmann Pedersen <s...@redhat.com>
Otherwise we can end up writing outside the alpha map.
---
pixman/pixman.c | 21 +++++++++++++++++----
1 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/pixman/pixman.c b/pixman/pixman.c
index cdf4b75..285bbfc 100644
--- a/pixman/pixman.c
+++ b/pixman/pixman.c
@@ -315,14 +315,27 @@ pixman_compute_composite_region32 (pixman_region32_t *
region,
return FALSE;
}
- if (dst_image->common.alpha_map &&
dst_image->common.alpha_map->common.have_clip_region)
+ if (dst_image->common.alpha_map)
{
- if (!clip_general_image (region,
&dst_image->common.alpha_map->common.clip_region,
- -dst_image->common.alpha_origin_x,
- -dst_image->common.alpha_origin_y))
+ if (!pixman_region32_intersect_rect (region, region,
+ dst_image->common.alpha_origin_x,
+ dst_image->common.alpha_origin_y,
+ dst_image->common.alpha_map->width,
+
dst_image->common.alpha_map->height))
{
return FALSE;
}
+ if (!pixman_region32_not_empty (region))
+ return FALSE;
+ if (dst_image->common.alpha_map->common.have_clip_region)
+ {
+ if (!clip_general_image (region,
&dst_image->common.alpha_map->common.clip_region,
+ -dst_image->common.alpha_origin_x,
+ -dst_image->common.alpha_origin_y))
+ {
+ return FALSE;
+ }
+ }
}
/* clip against src */
--
1.7.1.1
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