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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, UnidentifiedImageError from ._binary import i8, i16be as i16, i32be as i32 ## # 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 UnidentifiedImageError("cannot identify this image file")