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 o8

# 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)): msg = "not an XPM file" raise SyntaxError(msg) # skip forward to next string while True: s = self.fp.readline() if not s: msg = "broken XPM file" raise SyntaxError(msg) 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: msg = "cannot read this XPM file" raise ValueError(msg) # # load palette description palette = [b"\0\0\0"] * 256 for _ 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 = 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[: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 msg = "cannot read this XPM file" raise ValueError(msg) break else: # missing colour key msg = "cannot read this XPM file" raise ValueError(msg) 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")