#
# 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.
#
__version__ = "0.2"
import re, string
import Image, ImageFile, ImagePalette
# XPM header
xpm_head = re.compile("\"([0-9]*) ([0-9]*) ([0-9]*) ([0-9]*)")
def _accept(prefix):
return prefix[:9] == "/* XPM */"
##
# Image plugin for X11 pixel maps.
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 1:
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 = ["\0\0\0"] * 256
for i in range(pal):
s = self.fp.readline()
if s[-2:] == '\r\n':
s = s[:-2]
elif s[-1:] in '\r\n':
s = s[:-1]
c = ord(s[1])
s = string.split(s[2:-2])
for i in range(0, len(s), 2):
if s[i] == "c":
# process colour key
rgb = s[i+1]
if rgb == "None":
self.info["transparency"] = c
elif rgb[0] == "#":
# FIXME: handle colour names (see ImagePalette.py)
rgb = string.atoi(rgb[1:], 16)
palette[c] = chr((rgb >> 16) & 255) +\
chr((rgb >> 8) & 255) +\
chr(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", string.join(palette, ""))
self.tile = [("raw", (0, 0)+self.size, self.fp.tell(), ("P", 0, 1))]
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] = string.ljust(self.fp.readline()[1:xsize+1], xsize)
self.fp = None
return string.join(s, "")
#
# Registry
Image.register_open("XPM", XpmImageFile, _accept)
Image.register_extension("XPM", ".xpm")
Image.register_mime("XPM", "image/xpm")
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