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This adds support for VGA frame comparison testing with the reference generated from cairo. The retrieved frame from the chamelium is first cropped, as it contains the blanking intervals, through a dedicated helper. Another helper function asserts that the analog frame matches or dump it to png if not. Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com> Reviewed-by: Lyude <lyude@redhat.com>
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