179 lines
4.6 KiB
Python
179 lines
4.6 KiB
Python
#
|
|
# 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
|
|
from ._binary import i32le as dword
|
|
from ._binary import si16le as short
|
|
from ._binary import si32le as _long
|
|
|
|
_handler = None
|
|
|
|
|
|
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.
|
|
|
|
|
|
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
|
|
|
|
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"])
|