gbagfx: Various fixes and improvements

pret / pokeruby

Decompilation of Pokémon Ruby/Sapphire

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Closed Sierraffinity closed 4 years ago

Sierraffinity commented 4 years ago

Bring over Huffman compression/decompression from pokeemerald
Fix num_colors exceeding amount of colors in palette leading to use of uninitialized colors
Handle png -> pal conversion (aka extracting JASC palettes from png)
Allow JASC pal files to be used as -palette argument when converting from GBA to PNG
Allow using only file extension as output to reuse entire path from input before extension

Sierraffinity commented 4 years ago

Also changed some stuff in the Travis config to match pokeemerald (since it wasn't building gbagfx without that change).