[cairo] Faulty pattern rendering in cairo 1.9.6

[Franz Schmid]

Hi all,

i just found out that in 1.9.6 patterns stop tiling when the pattern
source exceeds a certain size. 1.9.4 works without any problems.

I'm attaching 2 compileable source files

patterntestl.c reads patternl.png (400x400 px) and outputs patternltest.png

patterntests.c reads patterns.png (100x100 px) and outputs patternstest.png

compile the files with
	gcc -I/usr/local/include/cairo -L/usr/local/lib -pthread -lcairo patterntestl.c -o patterntestl
and
	gcc -I/usr/local/include/cairo -L/usr/local/lib -pthread -lcairo patterntestl.c -o patterntestl

patternstest.png shows the expected result, but in patternltest.png the pattern is only
rendered once.

Greetings,
Franz Schmid

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