126 lines
3.1 KiB
Python
126 lines
3.1 KiB
Python
#
|
|
# 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: bytes) -> bool:
|
|
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) -> None:
|
|
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: int) -> bytes:
|
|
#
|
|
# load all image data in one chunk
|
|
|
|
xsize, ysize = self.size
|
|
|
|
s = [self.fp.readline()[1 : xsize + 1].ljust(xsize) for i in range(ysize)]
|
|
|
|
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")
|