[cjensen]

Yep. Use of AVX2 and so forth a pretty standard thing to do to get decent performance for video/image encoding and decoding.

Worth noting: Skylake with Integrate Graphics includes an x265 encoder and decoder. If that can't be adapted to HEIF, that's a huge win for the format.

[janwas]

If you're interested in this kind of thing, dc_predictor.cc might be fun to look at. It computes the predictors in parallel (rather than the usual 'do the same thing to 32 pixels') because here pixels depend on causal neighbor pixels.