174 lines
5 KiB
Python
174 lines
5 KiB
Python
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"""
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A Pillow loader for .dds files (S3TC-compressed aka DXTC)
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Jerome Leclanche <jerome@leclan.ch>
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Documentation:
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https://web.archive.org/web/20170802060935/http://oss.sgi.com/projects/ogl-sample/registry/EXT/texture_compression_s3tc.txt
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The contents of this file are hereby released in the public domain (CC0)
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Full text of the CC0 license:
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https://creativecommons.org/publicdomain/zero/1.0/
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"""
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import struct
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from io import BytesIO
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from . import Image, ImageFile
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# Magic ("DDS ")
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DDS_MAGIC = 0x20534444
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# DDS flags
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DDSD_CAPS = 0x1
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DDSD_HEIGHT = 0x2
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DDSD_WIDTH = 0x4
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DDSD_PITCH = 0x8
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DDSD_PIXELFORMAT = 0x1000
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DDSD_MIPMAPCOUNT = 0x20000
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DDSD_LINEARSIZE = 0x80000
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DDSD_DEPTH = 0x800000
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# DDS caps
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DDSCAPS_COMPLEX = 0x8
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DDSCAPS_TEXTURE = 0x1000
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DDSCAPS_MIPMAP = 0x400000
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DDSCAPS2_CUBEMAP = 0x200
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DDSCAPS2_CUBEMAP_POSITIVEX = 0x400
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DDSCAPS2_CUBEMAP_NEGATIVEX = 0x800
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DDSCAPS2_CUBEMAP_POSITIVEY = 0x1000
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DDSCAPS2_CUBEMAP_NEGATIVEY = 0x2000
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DDSCAPS2_CUBEMAP_POSITIVEZ = 0x4000
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DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x8000
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DDSCAPS2_VOLUME = 0x200000
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# Pixel Format
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DDPF_ALPHAPIXELS = 0x1
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DDPF_ALPHA = 0x2
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DDPF_FOURCC = 0x4
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DDPF_PALETTEINDEXED8 = 0x20
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DDPF_RGB = 0x40
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DDPF_LUMINANCE = 0x20000
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# dds.h
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DDS_FOURCC = DDPF_FOURCC
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DDS_RGB = DDPF_RGB
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DDS_RGBA = DDPF_RGB | DDPF_ALPHAPIXELS
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DDS_LUMINANCE = DDPF_LUMINANCE
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DDS_LUMINANCEA = DDPF_LUMINANCE | DDPF_ALPHAPIXELS
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DDS_ALPHA = DDPF_ALPHA
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DDS_PAL8 = DDPF_PALETTEINDEXED8
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DDS_HEADER_FLAGS_TEXTURE = (DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH |
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DDSD_PIXELFORMAT)
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DDS_HEADER_FLAGS_MIPMAP = DDSD_MIPMAPCOUNT
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DDS_HEADER_FLAGS_VOLUME = DDSD_DEPTH
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DDS_HEADER_FLAGS_PITCH = DDSD_PITCH
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DDS_HEADER_FLAGS_LINEARSIZE = DDSD_LINEARSIZE
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DDS_HEIGHT = DDSD_HEIGHT
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DDS_WIDTH = DDSD_WIDTH
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DDS_SURFACE_FLAGS_TEXTURE = DDSCAPS_TEXTURE
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DDS_SURFACE_FLAGS_MIPMAP = DDSCAPS_COMPLEX | DDSCAPS_MIPMAP
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DDS_SURFACE_FLAGS_CUBEMAP = DDSCAPS_COMPLEX
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DDS_CUBEMAP_POSITIVEX = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEX
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DDS_CUBEMAP_NEGATIVEX = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEX
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DDS_CUBEMAP_POSITIVEY = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEY
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DDS_CUBEMAP_NEGATIVEY = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEY
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DDS_CUBEMAP_POSITIVEZ = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEZ
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DDS_CUBEMAP_NEGATIVEZ = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEZ
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# DXT1
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DXT1_FOURCC = 0x31545844
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# DXT3
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DXT3_FOURCC = 0x33545844
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# DXT5
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DXT5_FOURCC = 0x35545844
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# dxgiformat.h
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DXGI_FORMAT_BC7_TYPELESS = 97
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DXGI_FORMAT_BC7_UNORM = 98
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DXGI_FORMAT_BC7_UNORM_SRGB = 99
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class DdsImageFile(ImageFile.ImageFile):
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format = "DDS"
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format_description = "DirectDraw Surface"
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def _open(self):
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magic, header_size = struct.unpack("<II", self.fp.read(8))
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if header_size != 124:
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raise IOError("Unsupported header size %r" % (header_size))
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header_bytes = self.fp.read(header_size - 4)
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if len(header_bytes) != 120:
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raise IOError("Incomplete header: %s bytes" % len(header_bytes))
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header = BytesIO(header_bytes)
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flags, height, width = struct.unpack("<3I", header.read(12))
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self._size = (width, height)
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self.mode = "RGBA"
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pitch, depth, mipmaps = struct.unpack("<3I", header.read(12))
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struct.unpack("<11I", header.read(44)) # reserved
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# pixel format
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pfsize, pfflags = struct.unpack("<2I", header.read(8))
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fourcc = header.read(4)
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bitcount, rmask, gmask, bmask, amask = struct.unpack("<5I",
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header.read(20))
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data_start = header_size + 4
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n = 0
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if fourcc == b"DXT1":
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self.pixel_format = "DXT1"
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n = 1
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elif fourcc == b"DXT3":
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self.pixel_format = "DXT3"
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n = 2
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elif fourcc == b"DXT5":
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self.pixel_format = "DXT5"
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n = 3
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elif fourcc == b"DX10":
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data_start += 20
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# ignoring flags which pertain to volume textures and cubemaps
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dxt10 = BytesIO(self.fp.read(20))
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dxgi_format, dimension = struct.unpack("<II", dxt10.read(8))
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if dxgi_format in (DXGI_FORMAT_BC7_TYPELESS,
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DXGI_FORMAT_BC7_UNORM):
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self.pixel_format = "BC7"
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n = 7
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elif dxgi_format == DXGI_FORMAT_BC7_UNORM_SRGB:
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self.pixel_format = "BC7"
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self.im_info["gamma"] = 1/2.2
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n = 7
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else:
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raise NotImplementedError("Unimplemented DXGI format %d" %
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(dxgi_format))
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else:
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raise NotImplementedError("Unimplemented pixel format %r" %
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(fourcc))
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self.tile = [
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("bcn", (0, 0) + self.size, data_start, (n))
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]
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def load_seek(self, pos):
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pass
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def _validate(prefix):
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return prefix[:4] == b"DDS "
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Image.register_open(DdsImageFile.format, DdsImageFile, _validate)
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Image.register_extension(DdsImageFile.format, ".dds")
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