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venus: swizzle the chroma channels for YVU420 to match the VkFormat

Yiwei Zhang requested to merge zzyiwei/mesa:vn-fix-yvu-swizzle into main

YVU420's chroma channels do not match the B/R channel order of VK_FORMAT_G8_B8_R8_3PLANE_420_UNORM and a swap is needed.

Test:

  • testVP8EncodeDecodeVideoFromBufferToSurface
  • android.media.cts.DecodeAccuracyTest
Edited by Yiwei Zhang

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