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399b916d27
The luminance needs to be pre- and post- multiplied by the alpha value in case of rescaling, for proper averaging. Also: - removed util/alpha_processing and moved it to dsp/ - removed WebPInitPremultiply() which was mostly useless and merged it with the new function WebPInitAlphaProcessing() Change-Id: If089cefd4ec53f6880a791c476fb1c7f7c5a8e60