Speed up invert colors effect
Summary: Signed-off-by: André Agenor <andreagenor@icloud.com> If all channels are selected a native Qt function is called, it is faster than calculating all channels and pixels in a loop This is 97% faster than before Reviewers: tcanabrava Reviewed By: tcanabrava Subscribers: pino Differential Revision: https://phabricator.kde.org/D20334
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