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[impeller] Drop support for R8 pixel format. #33455
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R8 cannot be supported on ES 2 without extensions and we can do with A8 instead. Avoid buffer copy in GLES backend. Texture::SetContents should not involve any intermediate copies now.
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R8 cannot be supported on ES 2 without extensions and we can do with A8 instead. Avoid buffer copy in GLES backend. Texture::SetContents should not involve any intermediate copies now.
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R8 cannot be supported on ES 2 without extensions and we can do with A8 instead. Avoid buffer copy in GLES backend. Texture::SetContents should not involve any intermediate copies now.