Performance improvement for the commit f227c35

performance-commit-f227c35.txt

Scale 2560×1600 RGB image
    to 320x200 bil      0.03336 s   122.80 Mpx/s    16.5 %
    to 320x200 bic      0.05439 s    75.31 Mpx/s     8.9 %
    to 320x200 lzs      0.08317 s    49.25 Mpx/s    10.3 %
    to 2048x1280 bil    0.16310 s    25.11 Mpx/s    20.7 %
    to 2048x1280 bic    0.19669 s    20.82 Mpx/s    23.3 %
    to 2048x1280 lzs    0.24614 s    16.64 Mpx/s    23.9 %
    to 5478x3424 bil    0.65588 s     6.25 Mpx/s    35.0 %
    to 5478x3424 bic    0.80276 s     5.10 Mpx/s    35.5 %
    to 5478x3424 lzs    0.96007 s     4.27 Mpx/s    38.3 %