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authorLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
committerLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
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tree0a77ada226d6db80639f96b438bf83e4e756edb5 /env/lib/python3.10/site-packages/PIL/FtexImagePlugin.py
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+"""
+A Pillow loader for .ftc and .ftu files (FTEX)
+Jerome Leclanche <jerome@leclan.ch>
+
+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/
+
+Independence War 2: Edge Of Chaos - Texture File Format - 16 October 2001
+
+The textures used for 3D objects in Independence War 2: Edge Of Chaos are in a
+packed custom format called FTEX. This file format uses file extensions FTC
+and FTU.
+* FTC files are compressed textures (using standard texture compression).
+* FTU files are not compressed.
+Texture File Format
+The FTC and FTU texture files both use the same format. This
+has the following structure:
+{header}
+{format_directory}
+{data}
+Where:
+{header} = {
+ u32:magic,
+ u32:version,
+ u32:width,
+ u32:height,
+ u32:mipmap_count,
+ u32:format_count
+}
+
+* The "magic" number is "FTEX".
+* "width" and "height" are the dimensions of the texture.
+* "mipmap_count" is the number of mipmaps in the texture.
+* "format_count" is the number of texture formats (different versions of the
+same texture) in this file.
+
+{format_directory} = format_count * { u32:format, u32:where }
+
+The format value is 0 for DXT1 compressed textures and 1 for 24-bit RGB
+uncompressed textures.
+The texture data for a format starts at the position "where" in the file.
+
+Each set of texture data in the file has the following structure:
+{data} = format_count * { u32:mipmap_size, mipmap_size * { u8 } }
+* "mipmap_size" is the number of bytes in that mip level. For compressed
+textures this is the size of the texture data compressed with DXT1. For 24 bit
+uncompressed textures, this is 3 * width * height. Following this are the image
+bytes for that mipmap level.
+
+Note: All data is stored in little-Endian (Intel) byte order.
+"""
+
+import struct
+from enum import IntEnum
+from io import BytesIO
+
+from . import Image, ImageFile
+from ._deprecate import deprecate
+
+MAGIC = b"FTEX"
+
+
+class Format(IntEnum):
+ DXT1 = 0
+ UNCOMPRESSED = 1
+
+
+def __getattr__(name):
+ for enum, prefix in {Format: "FORMAT_"}.items():
+ if name.startswith(prefix):
+ name = name[len(prefix) :]
+ if name in enum.__members__:
+ deprecate(f"{prefix}{name}", 10, f"{enum.__name__}.{name}")
+ return enum[name]
+ raise AttributeError(f"module '{__name__}' has no attribute '{name}'")
+
+
+class FtexImageFile(ImageFile.ImageFile):
+ format = "FTEX"
+ format_description = "Texture File Format (IW2:EOC)"
+
+ def _open(self):
+ if not _accept(self.fp.read(4)):
+ raise SyntaxError("not an FTEX file")
+ struct.unpack("<i", self.fp.read(4)) # version
+ self._size = struct.unpack("<2i", self.fp.read(8))
+ mipmap_count, format_count = struct.unpack("<2i", self.fp.read(8))
+
+ self.mode = "RGB"
+
+ # Only support single-format files.
+ # I don't know of any multi-format file.
+ assert format_count == 1
+
+ format, where = struct.unpack("<2i", self.fp.read(8))
+ self.fp.seek(where)
+ (mipmap_size,) = struct.unpack("<i", self.fp.read(4))
+
+ data = self.fp.read(mipmap_size)
+
+ if format == Format.DXT1:
+ self.mode = "RGBA"
+ self.tile = [("bcn", (0, 0) + self.size, 0, 1)]
+ elif format == Format.UNCOMPRESSED:
+ self.tile = [("raw", (0, 0) + self.size, 0, ("RGB", 0, 1))]
+ else:
+ raise ValueError(f"Invalid texture compression format: {repr(format)}")
+
+ self.fp.close()
+ self.fp = BytesIO(data)
+
+ def load_seek(self, pos):
+ pass
+
+
+def _accept(prefix):
+ return prefix[:4] == MAGIC
+
+
+Image.register_open(FtexImageFile.format, FtexImageFile, _accept)
+Image.register_extensions(FtexImageFile.format, [".ftc", ".ftu"])