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Clarify alpha-map loop prevention (#23581)

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Signed-off-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Adam Jackson 2010-05-11 10:45:09 -04:00
parent 724feb119a
commit e44c308a0a
1 changed files with 4 additions and 1 deletions
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5
renderproto.txt
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@ -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