Bryce Harrington ade7089f72 test: Exercise image scaling quality when downscaling ...

This adds testcases for the various cairo filter options, each of which
match to corresponding pixman filters.  Use the 'downscale' keyword if
invoking tests using cairo-test-suite.

The 24-pixel reference images were produced from quad-color.png using
Gimp's Scale Image command with Interpolation set to None.  It is
assumed that all filters should handle a 1:4 scaling cleanly with no
antialiased blurring.

The 95-pixel reference images assume differing types of antialiasing
based on the quality level.  We are using the image.argb32 output as
reference here.  Potentially some other rendering algorithm could
conceivably provide better results in the future.

The 96-pixel reference images are simply copies of the original
quad-color.png file.  It is assumed that 1:1 downscaling operations
should produce no visible change to the original image.

Signed-off-by: Bryce Harrington <b.harrington@samsung.com>

2013-09-11 19:32:08 +02:00

301 B

96x96px

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