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""" A Pillow loader for .dds files (S3TC-compressed aka DXTC) Jerome Leclanche Documentation: https://web.archive.org/web/20170802060935/http://oss.sgi.com/projects/ogl-sample/registry/EXT/texture_compression_s3tc.txt 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/ """ import struct from io import BytesIO from . import Image, ImageFile from ._binary import o32le as o32 # Magic ("DDS ") DDS_MAGIC = 0x20534444 # DDS flags DDSD_CAPS = 0x1 DDSD_HEIGHT = 0x2 DDSD_WIDTH = 0x4 DDSD_PITCH = 0x8 DDSD_PIXELFORMAT = 0x1000 DDSD_MIPMAPCOUNT = 0x20000 DDSD_LINEARSIZE = 0x80000 DDSD_DEPTH = 0x800000 # DDS caps DDSCAPS_COMPLEX = 0x8 DDSCAPS_TEXTURE = 0x1000 DDSCAPS_MIPMAP = 0x400000 DDSCAPS2_CUBEMAP = 0x200 DDSCAPS2_CUBEMAP_POSITIVEX = 0x400 DDSCAPS2_CUBEMAP_NEGATIVEX = 0x800 DDSCAPS2_CUBEMAP_POSITIVEY = 0x1000 DDSCAPS2_CUBEMAP_NEGATIVEY = 0x2000 DDSCAPS2_CUBEMAP_POSITIVEZ = 0x4000 DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x8000 DDSCAPS2_VOLUME = 0x200000 # Pixel Format DDPF_ALPHAPIXELS = 0x1 DDPF_ALPHA = 0x2 DDPF_FOURCC = 0x4 DDPF_PALETTEINDEXED8 = 0x20 DDPF_RGB = 0x40 DDPF_LUMINANCE = 0x20000 # dds.h DDS_FOURCC = DDPF_FOURCC DDS_RGB = DDPF_RGB DDS_RGBA = DDPF_RGB | DDPF_ALPHAPIXELS DDS_LUMINANCE = DDPF_LUMINANCE DDS_LUMINANCEA = DDPF_LUMINANCE | DDPF_ALPHAPIXELS DDS_ALPHA = DDPF_ALPHA DDS_PAL8 = DDPF_PALETTEINDEXED8 DDS_HEADER_FLAGS_TEXTURE = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT DDS_HEADER_FLAGS_MIPMAP = DDSD_MIPMAPCOUNT DDS_HEADER_FLAGS_VOLUME = DDSD_DEPTH DDS_HEADER_FLAGS_PITCH = DDSD_PITCH DDS_HEADER_FLAGS_LINEARSIZE = DDSD_LINEARSIZE DDS_HEIGHT = DDSD_HEIGHT DDS_WIDTH = DDSD_WIDTH DDS_SURFACE_FLAGS_TEXTURE = DDSCAPS_TEXTURE DDS_SURFACE_FLAGS_MIPMAP = DDSCAPS_COMPLEX | DDSCAPS_MIPMAP DDS_SURFACE_FLAGS_CUBEMAP = DDSCAPS_COMPLEX DDS_CUBEMAP_POSITIVEX = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEX DDS_CUBEMAP_NEGATIVEX = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEX DDS_CUBEMAP_POSITIVEY = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEY DDS_CUBEMAP_NEGATIVEY = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEY DDS_CUBEMAP_POSITIVEZ = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEZ DDS_CUBEMAP_NEGATIVEZ = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEZ # DXT1 DXT1_FOURCC = 0x31545844 # DXT3 DXT3_FOURCC = 0x33545844 # DXT5 DXT5_FOURCC = 0x35545844 # dxgiformat.h DXGI_FORMAT_R8G8B8A8_TYPELESS = 27 DXGI_FORMAT_R8G8B8A8_UNORM = 28 DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29 DXGI_FORMAT_BC5_TYPELESS = 82 DXGI_FORMAT_BC5_UNORM = 83 DXGI_FORMAT_BC5_SNORM = 84 DXGI_FORMAT_BC7_TYPELESS = 97 DXGI_FORMAT_BC7_UNORM = 98 DXGI_FORMAT_BC7_UNORM_SRGB = 99 class DdsImageFile(ImageFile.ImageFile): format = "DDS" format_description = "DirectDraw Surface" def _open(self): magic, header_size = struct.unpack("