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