This change improves compression speed and simplifies further modification of the code.
Testing:
The modified algorithm has been tested on the Kodak test set using 64-bit build with default settings (running on Windows 10, i7-4790, 3.6GHz). All the decompressed test images are identical to the images being compressed and decompressed using original version of Crunch.
[Compressing Kodak set without mipmaps]
Original: 1582222 bytes / 28.947 sec
Modified: 1494501 bytes / 17.642 sec
Improvement: 5.54% (compression ratio) / 39.05% (compression time)
[Compressing Kodak set with mipmaps]
Original: 2065243 bytes / 36.965 sec
Modified: 1945365 bytes / 22.989 sec
Improvement: 5.80% (compression ratio) / 37.81% (compression time)
Alexander Suvorov
e7d458aa22