Source code for PIL.XbmImagePlugin

#
# The Python Imaging Library.
# $Id$
#
# XBM File handling
#
# History:
# 1995-09-08 fl   Created
# 1996-11-01 fl   Added save support
# 1997-07-07 fl   Made header parser more tolerant
# 1997-07-22 fl   Fixed yet another parser bug
# 2001-02-17 fl   Use 're' instead of 'regex' (Python 2.1) (0.4)
# 2001-05-13 fl   Added hotspot handling (based on code from Bernhard Herzog)
# 2004-02-24 fl   Allow some whitespace before first #define
#
# Copyright (c) 1997-2004 by Secret Labs AB
# Copyright (c) 1996-1997 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#

import re
from . import Image, ImageFile

__version__ = "0.6"

# XBM header
xbm_head = re.compile(
    br"\s*#define[ \t]+.*_width[ \t]+(?P<width>[0-9]+)[\r\n]+"
    b"#define[ \t]+.*_height[ \t]+(?P<height>[0-9]+)[\r\n]+"
    b"(?P<hotspot>"
    b"#define[ \t]+[^_]*_x_hot[ \t]+(?P<xhot>[0-9]+)[\r\n]+"
    b"#define[ \t]+[^_]*_y_hot[ \t]+(?P<yhot>[0-9]+)[\r\n]+"
    b")?"
    b"[\\000-\\377]*_bits\\[\\]"
)


def _accept(prefix):
    return prefix.lstrip()[:7] == b"#define"


##
# Image plugin for X11 bitmaps.

[docs]class XbmImageFile(ImageFile.ImageFile): format = "XBM" format_description = "X11 Bitmap" def _open(self): m = xbm_head.match(self.fp.read(512)) if m: xsize = int(m.group("width")) ysize = int(m.group("height")) if m.group("hotspot"): self.info["hotspot"] = ( int(m.group("xhot")), int(m.group("yhot")) ) self.mode = "1" self._size = xsize, ysize self.tile = [("xbm", (0, 0)+self.size, m.end(), None)]
def _save(im, fp, filename): if im.mode != "1": raise IOError("cannot write mode %s as XBM" % im.mode) fp.write(("#define im_width %d\n" % im.size[0]).encode('ascii')) fp.write(("#define im_height %d\n" % im.size[1]).encode('ascii')) hotspot = im.encoderinfo.get("hotspot") if hotspot: fp.write(("#define im_x_hot %d\n" % hotspot[0]).encode('ascii')) fp.write(("#define im_y_hot %d\n" % hotspot[1]).encode('ascii')) fp.write(b"static char im_bits[] = {\n") ImageFile._save(im, fp, [("xbm", (0, 0)+im.size, 0, None)]) fp.write(b"};\n") Image.register_open(XbmImageFile.format, XbmImageFile, _accept) Image.register_save(XbmImageFile.format, _save) Image.register_extension(XbmImageFile.format, ".xbm") Image.register_mime(XbmImageFile.format, "image/xbm")