[cairo-bugs] [Bug 14853] New: Error: Cairo 1.4. 14 does not yet support the requested image format:

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Mar 6 08:35:06 PST 2008


           Summary: Error: Cairo 1.4.14 does not yet support the requested
                    image format:
           Product: cairo
           Version: 1.4.14
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: freedesktop.org at fales-lorenz.net
         QAContact: cairo-bugs at cairographics.org
                CC: freedesktop.org at fales-lorenz.net

Error: Cairo 1.4.14 does not yet support the requested image format:
        Depth: 16
        Alpha mask: 0x00000000
        Red   mask: 0x00007c00
        Green mask: 0x000003e0
        Blue  mask: 0x0000001f
Please file an enhancement request (quoting the above) at:
gaim: cairo-image-surface.c:199: _cairo_format_from_pixman_format: Assertion
`NOT_REACHED' failed.

This message showed up for a user using a Citrix terminal server.   He had
configured Citrix for a "16-bit" display, but in this case, it apparently uses
only 5 bits for each color.  He was able to work around the problem by
a "24 bit" display, but he prefers 16-bit for "work at home" due to the
improved performance.

If it helps, I was able to reproduce the problem using a VNC server started

  vncserver -depth 15 -pixelformat RGB555

(I understand that this is an unusual VNC configuration, and it's easy to use
something else.   This is just for testing, and simulating the Citrix case. 
It's apparently not possible for the Citrix users to select an alternative

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