Nico Weber 8a40b49b8b WebP/Lossy: Use 8-bit buffers for prediction and YUV data ...

This is safe because:

* prediction only computes averages, or explicitly clamps for
  TM_PRED / B_TM_PRED. Since the inputs are in [0, 255], so will the
  outputs.
* Addition of IDCT and prediction buffer is immediately clamped back
  to [0, 255]

No behavior change, and matches what both libwebp and the reference
implementation in rfc6386 do.

2023-05-31 22:38:36 +02:00

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