[bug #28590] Cairo backend displays wrong colors on X server with a different endianness

[Wolfgang Lux]

URL:
  <http://savannah.gnu.org/bugs/?28590>

                 Summary: Cairo backend displays wrong colors on X server
with a different endianness
                 Project: GNUstep
            Submitted by: wlux
            Submitted on: Mi 13 Jan 2010 13:55:48 GMT
                Category: Backend
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

When running GNUstep applications on a x86 machine and displaying them on an
X-server running on a PowerPC machine or vice versa, all pixels either lack a
byte swap or or are swapped once too often. See the attached screen shots of
Ink's color panel. Apparently ARGB get displayed as BRGA pixels. Neither the
art nor the xlib backend suffer this problem. The X-server has depth 24.

Out of curiosity I also tried to run the server in 16 bit mode, but the cairo
backend does not work in this configuration (neither locally nor remote),
reporting the error:
Cairo status 'invalid value for stride' in DPSinitgraphics



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File Attachments:


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Date: Mi 13 Jan 2010 13:55:48 GMT  Name: color-panel-black.tiff  Size: 21kB  
By: wlux

<http://savannah.gnu.org/bugs/download.php?file_id=19483>
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Date: Mi 13 Jan 2010 13:55:48 GMT  Name: color-panel-red.tiff  Size: 22kB  
By: wlux

<http://savannah.gnu.org/bugs/download.php?file_id=19484>
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Date: Mi 13 Jan 2010 13:55:48 GMT  Name: color-panel-green.tiff  Size: 20kB  
By: wlux

<http://savannah.gnu.org/bugs/download.php?file_id=19485>
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Date: Mi 13 Jan 2010 13:55:48 GMT  Name: color-panel-blue.tiff  Size: 21kB  
By: wlux

<http://savannah.gnu.org/bugs/download.php?file_id=19486>

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