tree e9930ca778462cf0bb1dbca21fa821f5cf1f1ac2
parent 754f6461f31bc9a59195891f601bcb25a4b57772
author Jayasanker J <jayasanker.j@ittiam.com> 1624966081 +0530
committer Wan-Teh Chang <wtc@google.com> 1626133508 +0000

Change the evaluation order of luma palette_size in speed 0

Added separate handling for speed 0 case where the speed feature
prune_palette_search_level is 0. The order of luma palette_size
evaluation in av1_rd_pick_palette_intra_sby() is changed from
descending order to ascending order in order to facilitate
early exit based on palette header rdcost.

This change has negligible effect on speed and quality in speed 0
encoding for good and allintra modes. This change is verified to
be bit-exact for speed > 0 in good and allintra encoding modes.

For allintra video encode (on screen content set),

          Instruction Count        BD-Rate Loss(%)
cpu-used     Reduction(%)   avg.psnr  ovr.psnr    ssim
   0          -0.044        -0.0014   -0.0015     0.0000

For good video encode (on screen content set),

          Instruction Count        BD-Rate Loss(%)
cpu-used     Reduction(%)   avg.psnr  ovr.psnr    ssim
   0           0.031         0.0078    0.0056    -0.0094

For AVIF still image encode,

          Instruction Count    BD-Rate Loss(%)
cpu-used     Reduction(%)      psnr       ssim
   0           -0.001          0.0001     0.0000

BUG=aomedia:3096
BUG=aomedia:2959

STATS_CHANGED

Change-Id: I9c9e55813af268c260c6ee0ee30842520cb991f3