Add flip filter implementation to core #920
Merged
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This pull request adds a simple filter implementation to allow for image flipping (both along the
x
andy
axis). Included are tests and documentation, as well as some general cleanup of theREADME.md
file.The included
OptionsResolver
abstraction was introduced to aid in the API differences between Symfony=2.3
and>=2.7
. My long-term intention is to move other filter loader implementations to using the options resolver as well; once this has been done, this abstraction can be removed in the2.x
branch where it is no longer required without affecting the method calls within filters.