summaryrefslogtreecommitdiff
path: root/renderproto.txt
diff options
context:
space:
mode:
authorAdam Jackson <ajax@redhat.com>2010-05-11 10:45:09 -0400
committerAdam Jackson <ajax@redhat.com>2010-05-11 10:45:09 -0400
commite44c308a0a268de2be2110c38a0a29d5b4101d10 (patch)
treeb266fd35dcb790ef6d14ffc797180676a0705f79 /renderproto.txt
parent724feb119aa1906f6a7a2f62fccb1b76bb56857c (diff)
Clarify alpha-map loop prevention (#23581)
Signed-off-by: Adam Jackson <ajax@redhat.com>
Diffstat (limited to 'renderproto.txt')
-rw-r--r--renderproto.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/renderproto.txt b/renderproto.txt
index a736ba7..70bf260 100644
--- a/renderproto.txt
+++ b/renderproto.txt
@@ -615,7 +615,10 @@ CreatePicture
Rendering is additionally clipped by the geometry and clip mask of
alpha-map. Exposures to the window do not affect the contents of
alpha-map. Alpha-map must refer to a picture containing a Pixmap,
- not a Window (or a Match error results).
+ not a Window (or a Match error results). If the alpha-map picture
+ itself already has an alpha-map, that alpha-map is used instead. If
+ the alpha-map picture points to the same drawable as the picture
+ itself, None is used instead.
The clip-mask restricts reads and writes to drawable. Only pixels
where the clip-mask has bits set to 1 are read or written. Pixels