Error: Cairo 1.4.10 does not yet support the requested image format: Depth: 16 Alpha mask: 0x00000000 Red mask: 0x00007c00 Green mask: 0x000003e0 Blue mask: 0x0000001f Is this available in newer versions?
I tested this a while ago with 1.4.14 using the following: Xvfb -screen 0 650x480x15 :1 -pixdepths 15 -render DISPLAY=:1 gedit and it worked great. Can you try that? If that works but not your actual server, there's something else we need to fix.
Mass closing of 8-/15-/16-/32-bit unsupported image formats as these should now all work in 1.6.0. Please test and reopen if you have any issues.
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