#
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# The Python Imaging Library.
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# $Id$
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#
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# XPM File handling
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#
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# History:
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# 1996-12-29 fl Created
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# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.7)
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#
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# Copyright (c) Secret Labs AB 1997-2001.
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# Copyright (c) Fredrik Lundh 1996-2001.
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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__ = "0.2"
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import re, string
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import Image, ImageFile, ImagePalette
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# XPM header
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xpm_head = re.compile("\"([0-9]*) ([0-9]*) ([0-9]*) ([0-9]*)")
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def _accept(prefix):
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return prefix[:9] == "/* XPM */"
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##
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# Image plugin for X11 pixel maps.
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class XpmImageFile(ImageFile.ImageFile):
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format = "XPM"
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format_description = "X11 Pixel Map"
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def _open(self):
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if not _accept(self.fp.read(9)):
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raise SyntaxError, "not an XPM file"
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# skip forward to next string
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while 1:
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s = self.fp.readline()
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if not s:
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raise SyntaxError, "broken XPM file"
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m = xpm_head.match(s)
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if m:
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break
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self.size = int(m.group(1)), int(m.group(2))
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pal = int(m.group(3))
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bpp = int(m.group(4))
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if pal > 256 or bpp != 1:
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raise ValueError, "cannot read this XPM file"
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#
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# load palette description
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palette = ["\0\0\0"] * 256
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for i in range(pal):
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s = self.fp.readline()
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if s[-2:] == '\r\n':
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s = s[:-2]
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elif s[-1:] in '\r\n':
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s = s[:-1]
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c = ord(s[1])
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s = string.split(s[2:-2])
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for i in range(0, len(s), 2):
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if s[i] == "c":
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# process colour key
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rgb = s[i+1]
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if rgb == "None":
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self.info["transparency"] = c
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elif rgb[0] == "#":
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# FIXME: handle colour names (see ImagePalette.py)
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rgb = string.atoi(rgb[1:], 16)
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palette[c] = chr((rgb >> 16) & 255) +\
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chr((rgb >> 8) & 255) +\
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chr(rgb & 255)
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else:
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# unknown colour
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raise ValueError, "cannot read this XPM file"
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break
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else:
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# missing colour key
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raise ValueError, "cannot read this XPM file"
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self.mode = "P"
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self.palette = ImagePalette.raw("RGB", string.join(palette, ""))
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self.tile = [("raw", (0, 0)+self.size, self.fp.tell(), ("P", 0, 1))]
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def load_read(self, bytes):
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#
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# load all image data in one chunk
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xsize, ysize = self.size
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s = [None] * ysize
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for i in range(ysize):
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s[i] = string.ljust(self.fp.readline()[1:xsize+1], xsize)
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self.fp = None
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return string.join(s, "")
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#
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# Registry
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Image.register_open("XPM", XpmImageFile, _accept)
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Image.register_extension("XPM", ".xpm")
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Image.register_mime("XPM", "image/xpm")
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