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projecten1/lib/python3.6/site-packages/PIL/GdImageFile.py

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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")