Bug 9251

The following error is reported when trying to lauch firefox, galeon or mozilla:

[jan@olympus:~$] Error: Cairo 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 enhacement request (quoting the above) at:
http://bugs.freedesktop.org/enter_bug.cgi?product=cairo
iceape-bin: /build/buildd/libcairo-1.2.4/src/cairo-image-surface.c:155:
_cairo_format_from_pixman_format: Assertion `NOT_REACHED' failed.

Similar problem using Citrix (on windows XP machine with 16-bit color setting)
to connect to a solaris 8 x-server. The error message is:

Error: Cairo 1.2.6 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:
http://bugs.freedesktop.org/enter_bug.cgi?product=cairo

xdpyinfo on the display gives:
name of display:    unix:11.0
version number:    11.0
vendor string:    Citrix Systems Inc
vendor release number:    51999
maximum request size:  4194300 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, MSBFirst, 32
image byte order:    MSBFirst
number of supported pixmap formats:    2
supported pixmap formats:
    depth 1, bits_per_pixel 1, scanline_pad 32
    depth 15, bits_per_pixel 16, scanline_pad 32
keycode range:    minimum 8, maximum 207
focus:  window 0x3c00009, revert to PointerRoot
number of extensions:    12
    BIG-REQUESTS
    DOUBLE-BUFFER
    GLX
    MIT-SHM
    MIT-SUNDRY-NONSTANDARD
    RECORD
    SECURITY
    SGI-GLX
    SHAPE
    SYNC
    XC-MISC
    XTEST
default screen number:    0
number of screens:    1

screen #0:
  dimensions:    1280x967 pixels (325x246 millimeters)
  resolution:    100x100 dots per inch
  depths (1):    15
  root window id:    0x26
  depth of root window:    15 planes
  number of colormaps:    minimum 1, maximum 1
  default colormap:    0x22
  default number of colormap cells:    32
  preallocated pixels:    black 0, white 32767
  options:    backing-store YES, save-unders YES
  largest cursor:    32x32
  current input event mask:    0x7a003f
    KeyPressMask             KeyReleaseMask           ButtonPressMask
    ButtonReleaseMask        EnterWindowMask          LeaveWindowMask
    StructureNotifyMask      SubstructureNotifyMask   SubstructureRedirectMask
    FocusChangeMask          PropertyChangeMask
  number of visuals:    1
  default visual id:  0x23
  visual:
    visual id:    0x23
    class:    TrueColor
    depth:    15 planes
    available colormap entries:    32 per subfield
    red, green, blue masks:    0x7c00, 0x3e0, 0x1f
    significant bits in color specification:    8 bits

Changing the Windows display setting to 32-bit color allowed citrix to select a
visual that cairo supports, but will be a problem for users who can't change
their color setting.

*** Bug 10461 has been marked as a duplicate of this bug. ***

*** Bug 9993 has been marked as a duplicate of this bug. ***

Retitling to make the actual issue more identifyable

A fix for this bug has now been pushed out to cairo's git repository:

http://gitweb.freedesktop.org/?p=cairo;a=commitdiff;h=333b96f0e0a7d

Look for the fix in an upcoming 1.5.2 development snapshot and an
upcoming 1.6.0 release.

Have fun with cairo!

-Carl