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Timothy B. Terriberry authored
This was not clamping the chroma block size to at least 4x4, even though it is getting contexts for coding the transform residual (which is at least 4x4). Thus it would copy too few contexts. This is an encoder-only change. It should not change the current encoder output, because we currently store twice as many entropy contexts as actually required, so we'll copy 1 and then check 2 to see if either are non-zero. However, this will break when we eliminate the context doubling, as instead we'll copy 0 and check 1. Change-Id: I4087529d6b3e7cd5a226746625b90494790983e6
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