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Editing: GdImageFile.py

#
# 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 :py:func:`PIL.Image.open()`.  To open a
    gd file, use the :py:func:`PIL.GdImageFile.open()` function instead.

.. warning::
    THE GD FORMAT IS NOT DESIGNED FOR DATA INTERCHANGE.  This
    implementation is provided for convenience and demonstrational
    purposes only.
"""

from . import ImageFile, ImagePalette, UnidentifiedImageError
from ._binary import i16be as i16
from ._binary import i32be as i32

class GdImageFile(ImageFile.ImageFile):
    """
    Image plugin for the GD uncompressed format.  Note that this format
    is not supported by the standard :py:func:`PIL.Image.open()` function.  To use
    this plugin, you have to import the :py:mod:`PIL.GdImageFile` module and
    use the :py:func:`PIL.GdImageFile.open()` function.
    """

format = "GD"
    format_description = "GD uncompressed images"

def _open(self):

# Header
        s = self.fp.read(1037)

if not i16(s) in [65534, 65535]:
            msg = "Not a valid GD 2.x .gd file"
            raise SyntaxError(msg)

self.mode = "L"  # FIXME: "P"
        self._size = i16(s, 2), i16(s, 4)

true_color = s[6]
        true_color_offset = 2 if true_color else 0

# transparency index
        tindex = i32(s, 7 + true_color_offset)
        if tindex < 256:
            self.info["transparency"] = tindex

self.palette = ImagePalette.raw(
            "XBGR", s[7 + true_color_offset + 4 : 7 + true_color_offset + 4 + 256 * 4]
        )

self.tile = [
            (
                "raw",
                (0, 0) + self.size,
                7 + true_color_offset + 4 + 256 * 4,
                ("L", 0, 1),
            )
        ]

def open(fp, mode="r"):
    """
    Load texture from a GD image file.

:param fp: 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 OSError: If the image could not be read.
    """
    if mode != "r":
        msg = "bad mode"
        raise ValueError(msg)

try:
        return GdImageFile(fp)
    except SyntaxError as e:
        msg = "cannot identify this image file"
        raise UnidentifiedImageError(msg) from e

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