Comment 23 for bug 133124

Attached is a patch against the ubuntulooks engine's ubuntulooks_progressbar_create_cell() to create a Cairo surface of the same type as the target rather than an RGB24 image surface. With this patch applied, Firefox runs starts fine with the Human theme.

The RGB24 image surface was what tipped me off to try different bit depths above. By making the pattern match the target surface's format, the composite fallback routine should be avoided.

It is worth noting that while this patch cleared up the crash for me, the bug probably still exists in Cairo's fallback compositing routines. Hopefully there is enough information here to produce a simpler test case though.