Am 18.10.11, 20:10 -0700 schrieb Pierre-Loup A. Griffais:
On 10/17/2011 11:41 PM, Kai-Uwe Behrmann wrote:
I am not sure where to start and seek for input on a problem with KWin and
Compiz. They show very similiar wrong rendering of borders, shadows and
the logout screens.
In compiz is a RGBA buffer used to contruct window borders and shadows:
/* all pixmaps are ARGB32 */
format = XRenderFindStandardFormat (xdisplay, PictStandardARGB32);
A sreenshot suggests that the 8-bit buffers are blended as is into the
30-bit visuals. What is the correct way to blend in the final frame buffer
image with XRenderComposite()?
Is the problem that the destination picture is created with the wrong format?
To create a Picture around the root window, the WM probably wants to use
PICT_a2r10g10b10 when it's depth 30 instead.
XRenderFindStandardFormat() accepts PictStandardARGB32 as the highest per
channel bit depth format. Seems like I have to figure out how to contruct
a XRenderPictFormat structure including XRenderDirectFormat. Here is some
basic description:
http://www.x.org/releases/current/doc/libXrender/libXrender.txt
A example is given in the nvidia docu:
http://ftp.iinet.net.au/pub/nvidia/freebsd/169.12/README/README
Are you trying to fix the same bug that I reported a while back?
https://bugs.kde.org/show_bug.cgi?id=214011
It looks similiar, giving a hint that it might be the same effect.
As a side note, the window contents are almost fine with the exception of
FF and GTK2 drawing areas.
I believe Damien Leone (CCed) came up with a patch for GTK that should fix
the issue you're seeing? He attached it to a bug you filed back in July:
https://bugzilla.gnome.org/show_bug.cgi?id=625202
Have you tried applying that to see if it fixes the non-WM related issues
you're seeing?
Thanks for the patch and as well for pointing to.
kind regards
Kai-Uwe Behrmann
--
developing for colour management
www.behrmann.name + www.oyranos.org
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