2i<dZddlZddlZddlmZddlmZddlmZm Z GddeZ Gd d eZ Gd d eZ d Z d#dZdZdZGddeZdZGdde jZGdde j*ZGddeZGddeZGdde j2ZdZej8ej:eeej<ej:dej>d eej>d!eej@ej:eejBd"ey)$a Blizzard Mipmap Format (.blp) Jerome Leclanche The contents of this file are hereby released in the public domain (CC0) Full text of the CC0 license: https://creativecommons.org/publicdomain/zero/1.0/ BLP1 files, used mostly in Warcraft III, are not fully supported. All types of BLP2 files used in World of Warcraft are supported. The BLP file structure consists of a header, up to 16 mipmaps of the texture Texture sizes must be powers of two, though the two dimensions do not have to be equal; 512x256 is valid, but 512x200 is not. The first mipmap (mipmap #0) is the full size image; each subsequent mipmap halves both dimensions. The final mipmap should be 1x1. BLP files come in many different flavours: * JPEG-compressed (type == 0) - only supported for BLP1. * RAW images (type == 1, encoding == 1). Each mipmap is stored as an array of 8-bit values, one per pixel, left to right, top to bottom. Each value is an index to the palette. * DXT-compressed (type == 1, encoding == 2): - DXT1 compression is used if alpha_encoding == 0. - An additional alpha bit is used if alpha_depth == 1. - DXT3 compression is used if alpha_encoding == 1. - DXT5 compression is used if alpha_encoding == 7. 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