Spaces:
Sleeping
Sleeping
| # | |
| # 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 __future__ import annotations | |
| from typing import IO | |
| from . import Image, ImageFile | |
| from ._binary import i16le as word | |
| from ._binary import si16le as short | |
| from ._binary import si32le as _long | |
| _handler = None | |
| def register_handler(handler: ImageFile.StubHandler | None) -> None: | |
| """ | |
| 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(ImageFile.StubHandler): | |
| def open(self, im: ImageFile.StubImageFile) -> None: | |
| im._mode = "RGB" | |
| self.bbox = im.info["wmf_bbox"] | |
| def load(self, im: ImageFile.StubImageFile) -> Image.Image: | |
| 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: bytes) -> bool: | |
| return ( | |
| prefix[:6] == b"\xd7\xcd\xc6\x9a\x00\x00" or prefix[:4] == b"\x01\x00\x00\x00" | |
| ) | |
| ## | |
| # Image plugin for Windows metafiles. | |
| class WmfStubImageFile(ImageFile.StubImageFile): | |
| format = "WMF" | |
| format_description = "Windows Metafile" | |
| def _open(self) -> None: | |
| 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": | |
| msg = "Unsupported WMF file format" | |
| raise SyntaxError(msg) | |
| elif s[:4] == b"\x01\x00\x00\x00" 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 = 2540.0 * (x1 - y0) / (frame[2] - frame[0]) | |
| ydpi = 2540.0 * (y1 - y0) / (frame[3] - frame[1]) | |
| self.info["wmf_bbox"] = x0, y0, x1, y1 | |
| if xdpi == ydpi: | |
| self.info["dpi"] = xdpi | |
| else: | |
| self.info["dpi"] = xdpi, ydpi | |
| else: | |
| msg = "Unsupported file format" | |
| raise SyntaxError(msg) | |
| self._mode = "RGB" | |
| self._size = size | |
| loader = self._load() | |
| if loader: | |
| loader.open(self) | |
| def _load(self) -> ImageFile.StubHandler | None: | |
| return _handler | |
| def load(self, dpi=None): | |
| if dpi is not None and self._inch is not None: | |
| self.info["dpi"] = dpi | |
| x0, y0, x1, y1 = self.info["wmf_bbox"] | |
| self._size = ( | |
| (x1 - x0) * self.info["dpi"] // self._inch, | |
| (y1 - y0) * self.info["dpi"] // self._inch, | |
| ) | |
| return super().load() | |
| def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None: | |
| if _handler is None or not hasattr(_handler, "save"): | |
| msg = "WMF save handler not installed" | |
| raise OSError(msg) | |
| _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"]) | |