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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.


__version__ = "0.1"

import ImageFile, ImagePalette

def i16(c):
    return ord(c[1]) + (ord(c[0])<<8)

##
# 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(775)

        self.mode = "L" # FIXME: "P"
        self.size = i16(s[0:2]), i16(s[2:4])

        # transparency index
        tindex = i16(s[5:7])
        if tindex < 256:
            self.info["transparent"] = tindex

        self.palette = ImagePalette.raw("RGB", s[7:])

        self.tile = [("raw", (0,0)+self.size, 775, ("L", 0, -1))]

##
# 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".
# @return An image instance.
# @exception IOError If the image could not be read.

def open(fp, mode = "r"):

    if mode != "r":
        raise ValueError("bad mode")

    if type(fp) == type(""):
        import __builtin__
        filename = fp
        fp = __builtin__.open(fp, "rb")
    else:
        filename = ""

    try:
        return GdImageFile(fp, filename)
    except SyntaxError:
        raise IOError("cannot identify this image file")