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Fix cross-colorspace bitBlt with channel flags

The channel flags passed to bitBlt should be applied to the source pixels in source color space. It means that the channels should be pre-processed with convertChannelToVisualRepresentation() before being blended into the destination.

Please take it into account that source color flags should be passed to convertChannelToVisualRepresentation, but alpha flags should go to the final blend operation.


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