Viewing file:  XpmImagePlugin.py (3.15 KB) -rw-r--r--
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#
# 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.
#
from __future__ import annotations
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.
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))]
def load_read(self, read_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")
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