Viewing file:  XbmImagePlugin.py (2.58 KB) -rw-r--r--
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#
# The Python Imaging Library.
# $Id$
#
# XBM File handling
#
# History:
# 1995-09-08 fl Created
# 1996-11-01 fl Added save support
# 1997-07-07 fl Made header parser more tolerant
# 1997-07-22 fl Fixed yet another parser bug
# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.4)
# 2001-05-13 fl Added hotspot handling (based on code from Bernhard Herzog)
# 2004-02-24 fl Allow some whitespace before first #define
#
# Copyright (c) 1997-2004 by Secret Labs AB
# Copyright (c) 1996-1997 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#
from __future__ import annotations
import re
from typing import IO
from . import Image, ImageFile
# XBM header
xbm_head = re.compile(
rb"\s*#define[ \t]+.*_width[ \t]+(?P<width>[0-9]+)[\r\n]+"
b"#define[ \t]+.*_height[ \t]+(?P<height>[0-9]+)[\r\n]+"
b"(?P<hotspot>"
b"#define[ \t]+[^_]*_x_hot[ \t]+(?P<xhot>[0-9]+)[\r\n]+"
b"#define[ \t]+[^_]*_y_hot[ \t]+(?P<yhot>[0-9]+)[\r\n]+"
b")?"
rb"[\000-\377]*_bits\[]"
)
def _accept(prefix: bytes) -> bool:
return prefix.lstrip()[:7] == b"#define"
##
# Image plugin for X11 bitmaps.
class XbmImageFile(ImageFile.ImageFile):
format = "XBM"
format_description = "X11 Bitmap"
def _open(self) -> None:
assert self.fp is not None
m = xbm_head.match(self.fp.read(512))
if not m:
msg = "not a XBM file"
raise SyntaxError(msg)
xsize = int(m.group("width"))
ysize = int(m.group("height"))
if m.group("hotspot"):
self.info["hotspot"] = (int(m.group("xhot")), int(m.group("yhot")))
self._mode = "1"
self._size = xsize, ysize
self.tile = [("xbm", (0, 0) + self.size, m.end(), None)]
def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
if im.mode != "1":
msg = f"cannot write mode {im.mode} as XBM"
raise OSError(msg)
fp.write(f"#define im_width {im.size[0]}\n".encode("ascii"))
fp.write(f"#define im_height {im.size[1]}\n".encode("ascii"))
hotspot = im.encoderinfo.get("hotspot")
if hotspot:
fp.write(f"#define im_x_hot {hotspot[0]}\n".encode("ascii"))
fp.write(f"#define im_y_hot {hotspot[1]}\n".encode("ascii"))
fp.write(b"static char im_bits[] = {\n")
ImageFile._save(im, fp, [("xbm", (0, 0) + im.size, 0, None)])
fp.write(b"};\n")
Image.register_open(XbmImageFile.format, XbmImageFile, _accept)
Image.register_save(XbmImageFile.format, _save)
Image.register_extension(XbmImageFile.format, ".xbm")
Image.register_mime(XbmImageFile.format, "image/xbm")
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