Rich Geldreich f631b29a7e Frontend optimizations: Adding multiple compression levels to the encoder's frontend. Level 2 and 4 are equivalent to the initial release (default or -slower). Level 1 is now the new default, and is on average 21% faster than level 2. (Or more, up to 2-2.5x, on large images.) The help text documents what encoder features are used in each level. Level 0 is fine for most images, but is weak on artificial images and really large complex images. -slower now sets level 2 (not 4). ...

Adding -only_etc1 command line option, because sometimes during unpack you only want the ETC1 images.

Total timing and avg. Y PSNR across 59 test images, quality 128:

L Time PSNR
0 121.4	35.45
1 172.4	36.87
2 216.0	37.13
3 511.4	37.15
4 665.9	37.41
5 1483.4	37.43

Initial release:
L Time PSNR
0 216.77	37.13
1 701.84	37.41

2019-05-31 15:14:58 -07:00

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