Source code for PIL.WmfImagePlugin

#
# The Python Imaging Library
# $Id$
#
# WMF stub codec
#
# history:
# 1996-12-14 fl   Created
# 2004-02-22 fl   Turned into a stub driver
# 2004-02-23 fl   Added EMF support
#
# Copyright (c) Secret Labs AB 1997-2004.  All rights reserved.
# Copyright (c) Fredrik Lundh 1996.
#
# See the README file for information on usage and redistribution.
#
# WMF/EMF reference documentation:
# https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-WMF/[MS-WMF].pdf
# http://wvware.sourceforge.net/caolan/index.html
# http://wvware.sourceforge.net/caolan/ora-wmf.html

from . import Image, ImageFile
from ._binary import i16le as word, i32le as dword, si16le as short, si32le as _long

_handler = None


[docs]def register_handler(handler): """ Install application-specific WMF image handler. :param handler: Handler object. """ global _handler _handler = handler
if hasattr(Image.core, "drawwmf"): # install default handler (windows only) class WmfHandler: def open(self, im): im.mode = "RGB" self.bbox = im.info["wmf_bbox"] def load(self, im): im.fp.seek(0) # rewind return Image.frombytes( "RGB", im.size, Image.core.drawwmf(im.fp.read(), im.size, self.bbox), "raw", "BGR", (im.size[0] * 3 + 3) & -4, -1, ) register_handler(WmfHandler()) # # -------------------------------------------------------------------- # Read WMF file def _accept(prefix): return ( prefix[:6] == b"\xd7\xcd\xc6\x9a\x00\x00" or prefix[:4] == b"\x01\x00\x00\x00" ) ## # Image plugin for Windows metafiles.
[docs]class WmfStubImageFile(ImageFile.StubImageFile): format = "WMF" format_description = "Windows Metafile" def _open(self): self._inch = None # check placable header s = self.fp.read(80) if s[:6] == b"\xd7\xcd\xc6\x9a\x00\x00": # placeable windows metafile # get units per inch self._inch = word(s, 14) # get bounding box x0 = short(s, 6) y0 = short(s, 8) x1 = short(s, 10) y1 = short(s, 12) # normalize size to 72 dots per inch self.info["dpi"] = 72 size = ( (x1 - x0) * self.info["dpi"] // self._inch, (y1 - y0) * self.info["dpi"] // self._inch, ) self.info["wmf_bbox"] = x0, y0, x1, y1 # sanity check (standard metafile header) if s[22:26] != b"\x01\x00\t\x00": raise SyntaxError("Unsupported WMF file format") elif dword(s) == 1 and s[40:44] == b" EMF": # enhanced metafile # get bounding box x0 = _long(s, 8) y0 = _long(s, 12) x1 = _long(s, 16) y1 = _long(s, 20) # get frame (in 0.01 millimeter units) frame = _long(s, 24), _long(s, 28), _long(s, 32), _long(s, 36) size = x1 - x0, y1 - y0 # calculate dots per inch from bbox and frame xdpi = int(2540.0 * (x1 - y0) / (frame[2] - frame[0]) + 0.5) ydpi = int(2540.0 * (y1 - y0) / (frame[3] - frame[1]) + 0.5) self.info["wmf_bbox"] = x0, y0, x1, y1 if xdpi == ydpi: self.info["dpi"] = xdpi else: self.info["dpi"] = xdpi, ydpi else: raise SyntaxError("Unsupported file format") self.mode = "RGB" self._size = size loader = self._load() if loader: loader.open(self) def _load(self): return _handler
[docs] def load(self, dpi=None): if dpi is not None and self._inch is not None: self.info["dpi"] = int(dpi + 0.5) x0, y0, x1, y1 = self.info["wmf_bbox"] self._size = ( (x1 - x0) * self.info["dpi"] // self._inch, (y1 - y0) * self.info["dpi"] // self._inch, ) super().load()
def _save(im, fp, filename): if _handler is None or not hasattr(_handler, "save"): raise OSError("WMF save handler not installed") _handler.save(im, fp, filename) # # -------------------------------------------------------------------- # Registry stuff Image.register_open(WmfStubImageFile.format, WmfStubImageFile, _accept) Image.register_save(WmfStubImageFile.format, _save) Image.register_extensions(WmfStubImageFile.format, [".wmf", ".emf"])