Source code for PIL.XpmImagePlugin

#
# The Python Imaging Library.
# $Id$
#
# XPM File handling
#
# History:
# 1996-12-29 fl   Created
# 2001-02-17 fl   Use 're' instead of 'regex' (Python 2.1) (0.7)
#
# Copyright (c) Secret Labs AB 1997-2001.
# Copyright (c) Fredrik Lundh 1996-2001.
#
# See the README file for information on usage and redistribution.
#


import re
from . import Image, ImageFile, ImagePalette
from ._binary import i8, o8

__version__ = "0.2"

# XPM header
xpm_head = re.compile(b"\"([0-9]*) ([0-9]*) ([0-9]*) ([0-9]*)")


def _accept(prefix):
    return prefix[:9] == b"/* XPM */"


##
# Image plugin for X11 pixel maps.

[docs]class XpmImageFile(ImageFile.ImageFile): format = "XPM" format_description = "X11 Pixel Map" def _open(self): if not _accept(self.fp.read(9)): raise SyntaxError("not an XPM file") # skip forward to next string while True: s = self.fp.readline() if not s: raise SyntaxError("broken XPM file") m = xpm_head.match(s) if m: break self._size = int(m.group(1)), int(m.group(2)) pal = int(m.group(3)) bpp = int(m.group(4)) if pal > 256 or bpp != 1: raise ValueError("cannot read this XPM file") # # load palette description palette = [b"\0\0\0"] * 256 for i in range(pal): s = self.fp.readline() if s[-2:] == b'\r\n': s = s[:-2] elif s[-1:] in b'\r\n': s = s[:-1] c = i8(s[1]) s = s[2:-2].split() for i in range(0, len(s), 2): if s[i] == b"c": # process colour key rgb = s[i+1] if rgb == b"None": self.info["transparency"] = c elif rgb[0:1] == b"#": # FIXME: handle colour names (see ImagePalette.py) rgb = int(rgb[1:], 16) palette[c] = (o8((rgb >> 16) & 255) + o8((rgb >> 8) & 255) + o8(rgb & 255)) else: # unknown colour raise ValueError("cannot read this XPM file") break else: # missing colour key raise ValueError("cannot read this XPM file") self.mode = "P" self.palette = ImagePalette.raw("RGB", b"".join(palette)) self.tile = [("raw", (0, 0)+self.size, self.fp.tell(), ("P", 0, 1))]
[docs] def load_read(self, bytes): # # load all image data in one chunk xsize, ysize = self.size s = [None] * ysize for i in range(ysize): s[i] = self.fp.readline()[1:xsize+1].ljust(xsize) return b"".join(s)
# # Registry Image.register_open(XpmImageFile.format, XpmImageFile, _accept) Image.register_extension(XpmImageFile.format, ".xpm") Image.register_mime(XpmImageFile.format, "image/xpm")