#
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# The Python Imaging Library.
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# $Id$
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#
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# XBM File handling
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#
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# History:
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# 1995-09-08 fl Created
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# 1996-11-01 fl Added save support
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# 1997-07-07 fl Made header parser more tolerant
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# 1997-07-22 fl Fixed yet another parser bug
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# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.4)
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# 2001-05-13 fl Added hotspot handling (based on code from Bernhard Herzog)
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# 2004-02-24 fl Allow some whitespace before first #define
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#
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# Copyright (c) 1997-2004 by Secret Labs AB
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# Copyright (c) 1996-1997 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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__version__ = "0.6"
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import re, string
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import Image, ImageFile
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# XBM header
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xbm_head = re.compile(
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"\s*#define[ \t]+[^_]*_width[ \t]+(?P<width>[0-9]+)[\r\n]+"
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"#define[ \t]+[^_]*_height[ \t]+(?P<height>[0-9]+)[\r\n]+"
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"(?P<hotspot>"
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"#define[ \t]+[^_]*_x_hot[ \t]+(?P<xhot>[0-9]+)[\r\n]+"
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"#define[ \t]+[^_]*_y_hot[ \t]+(?P<yhot>[0-9]+)[\r\n]+"
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")?"
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"[\\000-\\377]*_bits\\[\\]"
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)
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def _accept(prefix):
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return string.lstrip(prefix)[:7] == "#define"
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##
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# Image plugin for X11 bitmaps.
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class XbmImageFile(ImageFile.ImageFile):
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format = "XBM"
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format_description = "X11 Bitmap"
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def _open(self):
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m = xbm_head.match(self.fp.read(512))
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if m:
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xsize = int(m.group("width"))
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ysize = int(m.group("height"))
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if m.group("hotspot"):
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self.info["hotspot"] = (
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int(m.group("xhot")), int(m.group("yhot"))
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)
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self.mode = "1"
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self.size = xsize, ysize
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self.tile = [("xbm", (0, 0)+self.size, m.end(), None)]
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def _save(im, fp, filename):
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if im.mode != "1":
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raise IOError, "cannot write mode %s as XBM" % im.mode
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fp.write("#define im_width %d\n" % im.size[0])
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fp.write("#define im_height %d\n" % im.size[1])
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hotspot = im.encoderinfo.get("hotspot")
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if hotspot:
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fp.write("#define im_x_hot %d\n" % hotspot[0])
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fp.write("#define im_y_hot %d\n" % hotspot[1])
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fp.write("static char im_bits[] = {\n")
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ImageFile._save(im, fp, [("xbm", (0,0)+im.size, 0, None)])
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fp.write("};\n")
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Image.register_open("XBM", XbmImageFile, _accept)
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Image.register_save("XBM", _save)
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Image.register_extension("XBM", ".xbm")
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Image.register_mime("XBM", "image/xbm")
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