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Remove the duplicated process to force decode (draw on bitmap context) in Image/IO's progressive decoding. #2314
New Pull Request Checklist
Pull Request Description
This PR is cherry-picked from #2303 which is merged in 5.x. This fix the extra draw during progressive decoding for JPEG/PNG images by Image/IO coder.
Tested with iOS 7 Real device, that fix is also works. So we should merge this into 4.x branch as well.
@@ Coverage Diff @@ ## master #2314 +/- ## ========================================== - Coverage 75.81% 75.64% -0.18% ========================================== Files 36 36 Lines 3751 3736 -15 ========================================== - Hits 2844 2826 -18 - Misses 907 910 +3