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- #
- # The Python Imaging Library.
- # $Id$
- #
- # GD file handling
- #
- # History:
- # 1996-04-12 fl Created
- #
- # Copyright (c) 1997 by Secret Labs AB.
- # Copyright (c) 1996 by Fredrik Lundh.
- #
- # See the README file for information on usage and redistribution.
- #
-
-
- # NOTE: This format cannot be automatically recognized, so the
- # class is not registered for use with Image.open(). To open a
- # gd file, use the GdImageFile.open() function instead.
-
- # THE GD FORMAT IS NOT DESIGNED FOR DATA INTERCHANGE. This
- # implementation is provided for convenience and demonstrational
- # purposes only.
-
-
- from . import ImageFile, ImagePalette
- from ._binary import i8, i16be as i16, i32be as i32
-
- __version__ = "0.1"
-
-
- ##
- # Image plugin for the GD uncompressed format. Note that this format
- # is not supported by the standard <b>Image.open</b> function. To use
- # this plugin, you have to import the <b>GdImageFile</b> module and
- # use the <b>GdImageFile.open</b> function.
-
- class GdImageFile(ImageFile.ImageFile):
-
- format = "GD"
- format_description = "GD uncompressed images"
-
- def _open(self):
-
- # Header
- s = self.fp.read(1037)
-
- if not i16(s[:2]) in [65534, 65535]:
- raise SyntaxError("Not a valid GD 2.x .gd file")
-
- self.mode = "L" # FIXME: "P"
- self._size = i16(s[2:4]), i16(s[4:6])
-
- trueColor = i8(s[6])
- trueColorOffset = 2 if trueColor else 0
-
- # transparency index
- tindex = i32(s[7+trueColorOffset:7+trueColorOffset+4])
- if tindex < 256:
- self.info["transparency"] = tindex
-
- self.palette = ImagePalette.raw("XBGR", s[7+trueColorOffset+4:7+trueColorOffset+4+256*4])
-
- self.tile = [("raw", (0, 0)+self.size, 7+trueColorOffset+4+256*4,
- ("L", 0, 1))]
-
-
- def open(fp, mode="r"):
- """
- Load texture from a GD image file.
-
- :param filename: GD file name, or an opened file handle.
- :param mode: Optional mode. In this version, if the mode argument
- is given, it must be "r".
- :returns: An image instance.
- :raises IOError: If the image could not be read.
- """
- if mode != "r":
- raise ValueError("bad mode")
-
- try:
- return GdImageFile(fp)
- except SyntaxError:
- raise IOError("cannot identify this image file")
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