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Diffstat (limited to 'renderproto.txt')
| -rw-r--r-- | renderproto.txt | 5 |
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 |