[cairo-bugs] [Bug 4945] Cairo doesn't support 8-bit pseudocolor visuals

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=4945





------- Comment #52 from brian.cameron at sun.com  2007-05-03 00:40 PST -------
Created an attachment (id=9844)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=9844&action=view)
updated patch for cairo 1.4.6


I noticed that the latest version of this patch is for cairo 1.4.2 and apply
against cairo 1.4.6.  The code is pretty much the same, though the structures
have now moved into cairo-xlib-surface-private.h.

I notice when I log into my session passing "-depth 8" to the Xorg Xserver, so
I am running in 8bit mode that there are some problems:

- sometimes the background image doesn't look right.  Depending on the 
  background image used, it looks like it isn't being scaled cleanly or it
  sometimes has horizontal black lines running through the image.
- I also notice that gnome-screenshot seems to take really messed up pictures 
  of the desktop.  

So I'm not sure 8bit mode works perfectly even with this patch applied, though
those bugs may not be related to cairo.  I'm not sure.  I see the exact same
problems running with the earlier version of the patch with cairo 1.4.0, so I
do not think these problems are introduced by my update of the patch.

I haven't filed bugs against these two issues yet since this 8bit logic isn't
yet integrated into cairo.  I just mention I am seeing these problems so the
cairo developers can look into this and see if they might understand what the
problems may be.  If these aren't cairo problems, we probably should file bugs
against control-center Desktop Background capplet and gnome-screenshot once
this patch goes upstream.


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