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86 lines
2.3 KiB
Python
86 lines
2.3 KiB
Python
5 years ago
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#
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# The Python Imaging Library.
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# $Id$
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#
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# GD file handling
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#
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# History:
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# 1996-04-12 fl Created
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#
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# Copyright (c) 1997 by Secret Labs AB.
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# Copyright (c) 1996 by Fredrik Lundh.
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#
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# See the README file for information on usage and redistribution.
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#
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# NOTE: This format cannot be automatically recognized, so the
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# class is not registered for use with Image.open(). To open a
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# gd file, use the GdImageFile.open() function instead.
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# THE GD FORMAT IS NOT DESIGNED FOR DATA INTERCHANGE. This
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# implementation is provided for convenience and demonstrational
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# purposes only.
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from . import ImageFile, ImagePalette, UnidentifiedImageError
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from ._binary import i8, i16be as i16, i32be as i32
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##
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# Image plugin for the GD uncompressed format. Note that this format
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# is not supported by the standard <b>Image.open</b> function. To use
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# this plugin, you have to import the <b>GdImageFile</b> module and
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# use the <b>GdImageFile.open</b> function.
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class GdImageFile(ImageFile.ImageFile):
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format = "GD"
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format_description = "GD uncompressed images"
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def _open(self):
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# Header
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s = self.fp.read(1037)
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if not i16(s[:2]) in [65534, 65535]:
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raise SyntaxError("Not a valid GD 2.x .gd file")
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self.mode = "L" # FIXME: "P"
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self._size = i16(s[2:4]), i16(s[4:6])
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trueColor = i8(s[6])
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trueColorOffset = 2 if trueColor else 0
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# transparency index
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tindex = i32(s[7 + trueColorOffset : 7 + trueColorOffset + 4])
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if tindex < 256:
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self.info["transparency"] = tindex
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self.palette = ImagePalette.raw(
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"XBGR", s[7 + trueColorOffset + 4 : 7 + trueColorOffset + 4 + 256 * 4]
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)
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self.tile = [
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("raw", (0, 0) + self.size, 7 + trueColorOffset + 4 + 256 * 4, ("L", 0, 1))
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]
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def open(fp, mode="r"):
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"""
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Load texture from a GD image file.
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:param filename: GD file name, or an opened file handle.
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:param mode: Optional mode. In this version, if the mode argument
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is given, it must be "r".
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:returns: An image instance.
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:raises IOError: If the image could not be read.
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"""
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if mode != "r":
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raise ValueError("bad mode")
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try:
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return GdImageFile(fp)
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except SyntaxError:
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raise UnidentifiedImageError("cannot identify this image file")
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