mirror of
https://github.com/python-pillow/Pillow.git
synced 2025-11-04 01:47:47 +03:00
173 lines
4.9 KiB
Python
173 lines
4.9 KiB
Python
"""
|
|
A Pillow loader for .dds files (S3TC-compressed aka DXTC)
|
|
Jerome Leclanche <jerome@leclan.ch>
|
|
|
|
Documentation:
|
|
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
|
|
|
|
|
|
# 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_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("<II", self.fp.read(8))
|
|
if header_size != 124:
|
|
raise IOError("Unsupported header size %r" % (header_size))
|
|
header_bytes = self.fp.read(header_size - 4)
|
|
if len(header_bytes) != 120:
|
|
raise IOError("Incomplete header: %s bytes" % len(header_bytes))
|
|
header = BytesIO(header_bytes)
|
|
|
|
flags, height, width = struct.unpack("<3I", header.read(12))
|
|
self.size = (width, height)
|
|
self.mode = "RGBA"
|
|
|
|
pitch, depth, mipmaps = struct.unpack("<3I", header.read(12))
|
|
reserved = struct.unpack("<11I", header.read(44))
|
|
|
|
# pixel format
|
|
pfsize, pfflags = struct.unpack("<2I", header.read(8))
|
|
fourcc = header.read(4)
|
|
bitcount, rmask, gmask, bmask, amask = struct.unpack("<5I",
|
|
header.read(20))
|
|
|
|
data_start = header_size + 4
|
|
n = 0
|
|
if fourcc == b"DXT1":
|
|
self.pixel_format = "DXT1"
|
|
n = 1
|
|
elif fourcc == b"DXT3":
|
|
self.pixel_format = "DXT3"
|
|
n = 2
|
|
elif fourcc == b"DXT5":
|
|
self.pixel_format = "DXT5"
|
|
n = 3
|
|
elif fourcc == b"DX10":
|
|
data_start += 20
|
|
# ignoring flags which pertain to volume textures and cubemaps
|
|
dxt10 = BytesIO(self.fp.read(20))
|
|
dxgi_format, dimension = struct.unpack("<II", dxt10.read(8))
|
|
if dxgi_format in (DXGI_FORMAT_BC7_TYPELESS, DXGI_FORMAT_BC7_UNORM):
|
|
self.pixel_format = "BC7"
|
|
n = 7
|
|
elif dxgi_format == DXGI_FORMAT_BC7_UNORM_SRGB:
|
|
self.pixel_format = "BC7"
|
|
self.im_info["gamma"] = 1/2.2
|
|
n = 7
|
|
else:
|
|
raise NotImplementedError("Unimplemented DXGI format %d" %
|
|
(dxgi_format))
|
|
else:
|
|
raise NotImplementedError("Unimplemented pixel format %r" %
|
|
(fourcc))
|
|
|
|
self.tile = [
|
|
("bcn", (0, 0) + self.size, data_start, (n))
|
|
]
|
|
|
|
def load_seek(self, pos):
|
|
pass
|
|
|
|
|
|
def _validate(prefix):
|
|
return prefix[:4] == b"DDS "
|
|
|
|
|
|
Image.register_open(DdsImageFile.format, DdsImageFile, _validate)
|
|
Image.register_extension(DdsImageFile.format, ".dds")
|