mirror of
https://github.com/python-pillow/Pillow.git
synced 2025-10-31 16:07:30 +03:00
166 lines
4.0 KiB
Python
166 lines
4.0 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.
|
|
#
|
|
|
|
__version__ = "0.2"
|
|
|
|
from PIL import Image, ImageFile, _binary
|
|
|
|
_handler = None
|
|
|
|
if str != bytes:
|
|
long = int
|
|
|
|
##
|
|
# Install application-specific WMF image handler.
|
|
#
|
|
# @param handler Handler object.
|
|
|
|
def register_handler(handler):
|
|
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())
|
|
|
|
# --------------------------------------------------------------------
|
|
|
|
word = _binary.i16le
|
|
|
|
def short(c, o=0):
|
|
v = word(c, o)
|
|
if v >= 32768:
|
|
v = v - 65536
|
|
return v
|
|
|
|
dword = _binary.i32le
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
# 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):
|
|
|
|
# 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
|
|
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
|
|
size = (x1 - x0) * 72 // inch, (y1 - y0) * 72 // inch
|
|
|
|
self.info["wmf_bbox"] = x0, y0, x1, y1
|
|
|
|
self.info["dpi"] = 72
|
|
|
|
# print self.mode, self.size, self.info
|
|
|
|
# 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 = dword(s, 8); y0 = dword(s, 12)
|
|
x1 = dword(s, 16); y1 = dword(s, 20)
|
|
|
|
# get frame (in 0.01 millimeter units)
|
|
frame = dword(s, 24), dword(s, 28), dword(s, 32), dword(s, 36)
|
|
|
|
# normalize size to 72 dots per inch
|
|
size = x1 - x0, y1 - y0
|
|
|
|
# calculate dots per inch from bbox and frame
|
|
xdpi = 2540 * (x1 - y0) // (frame[2] - frame[0])
|
|
ydpi = 2540 * (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:
|
|
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 _save(im, fp, filename):
|
|
if _handler is None or not hasattr("_handler", "save"):
|
|
raise IOError("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_extension(WmfStubImageFile.format, ".wmf")
|
|
Image.register_extension(WmfStubImageFile.format, ".emf")
|