diff options
Diffstat (limited to 'doc/libXrender.txt')
| -rw-r--r-- | doc/libXrender.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/libXrender.txt b/doc/libXrender.txt index 27cc75d..753ee98 100644 --- a/doc/libXrender.txt +++ b/doc/libXrender.txt @@ -84,7 +84,8 @@ as a separate argument which marks the valid entries. 2.4 Colors The core protocol XColor type doesn't include an alpha component, so Xrender -has a separate type. +has a separate type. Note that XRender expects premultiplied alpha in all +cases except with the gradient operations. typedef struct { unsigned short red; @@ -526,6 +527,8 @@ conceptually built. 7.1 Composite XRenderComposite exposes the RenderComposite protocol request directly. +If a format with alpha is used, make sure it is premultiplied into the +color channels. void XRenderComposite (Display *dpy, |