[cairo] Running cairo-test-suite with -as / cairo_surface_set_device_scale() and the test suite / image scaling madness

[Bill Spitzak]

Attached is my test program for the filtering. This uses the xlib cairo 
backend (and thus requires patching cairo so that the fallback image is 
used for xlib).

To build, extract the tar file, cd to the cairot directory, and type 
make. The test program is ./image.

Edit the source code to change the size of the checkerboard pattern. 
Most tests were done with 1-pixel stripes, by setting CHECKER to 1 and 
YCHECKER to 1000.
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