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Single-plane variant of CfL predictor

David Michael Barr requested to merge barrbrain/dav1d:cfl-pred-1 into master

This addresses issue #36 (closed). A new function is added to Dav1dIntraPredDSPContext for predicting a single plane.

Alpha values are checked for zeroes in recon_b_intra to decide whether to:

  • predict both planes from AC and first rows of DC;
  • predict the zero-alpha plane directly by DC and the non-zero plane by AC and first row of DC.

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VideoLAN code repository instance