pixfmt_conv.c: RGB <-> RGBA #397
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Reduces time per 4k frame from 9 ms to about 5 ms.
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This PR adds conversions between RGBA and RGB written in SIMD intrinsics, reducing time per 4k frame from 9 ms to about 5 ms.
This code specializes only for color shifts of the RGBx and BGRx formats, since allowing arbitrary channel shifts would complicate code unnecessarily and wouldn't be faster.