diff options
| author | Lauri Kasanen <cand@gmx.com> | 2015-05-18 19:41:03 +0300 |
|---|---|---|
| committer | Adam Jackson <ajax@redhat.com> | 2015-05-21 11:19:16 -0400 |
| commit | b2df5bc42f64b45e44dbad61f3386bcb5ec1383d (patch) | |
| tree | eebcf08bb66a766d5950410169352cfb5d5cc7ad | |
| parent | bb890936bcc6053cb7a46cd9225c257ff1be389f (diff) | |
Fix documentation to explicitly mention premultiplied alpha
Before this patch, it wasn't mentioned in this file at all, which
is a monumental oversight.
Signed-off-by: Lauri Kasanen <cand@gmx.com>
| -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, |