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168 lines
4.1 KiB
Python
168 lines
4.1 KiB
Python
#
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# The Python Imaging Library
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# $Id$
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#
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# WMF stub codec
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#
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# history:
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# 1996-12-14 fl Created
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# 2004-02-22 fl Turned into a stub driver
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# 2004-02-23 fl Added EMF support
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#
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# Copyright (c) Secret Labs AB 1997-2004. All rights reserved.
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# Copyright (c) Fredrik Lundh 1996.
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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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__version__ = "0.2"
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import Image, ImageFile
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_handler = None
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##
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# Install application-specific WMF image handler.
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#
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# @param handler Handler object.
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def register_handler(handler):
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global _handler
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_handler = handler
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if hasattr(Image.core, "drawwmf"):
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# install default handler (windows only)
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class WmfHandler:
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def open(self, im):
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im.mode = "RGB"
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self.bbox = im.info["wmf_bbox"]
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def load(self, im):
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im.fp.seek(0) # rewind
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return Image.fromstring(
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"RGB", im.size,
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Image.core.drawwmf(im.fp.read(), im.size, self.bbox),
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"raw", "BGR", (im.size[0]*3 + 3) & -4, -1
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)
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register_handler(WmfHandler())
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# --------------------------------------------------------------------
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def word(c, o=0):
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return ord(c[o]) + (ord(c[o+1])<<8)
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def short(c, o=0):
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v = ord(c[o]) + (ord(c[o+1])<<8)
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if v >= 32768:
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v = v - 65536
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return v
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def dword(c, o=0):
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return ord(c[o]) + (ord(c[o+1])<<8) + (ord(c[o+2])<<16) + (ord(c[o+3])<<24)
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def long(c, o=0):
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return dword(c, o)
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#
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# --------------------------------------------------------------------
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# Read WMF file
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def _accept(prefix):
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return (
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prefix[:6] == "\xd7\xcd\xc6\x9a\x00\x00" or
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prefix[:4] == "\x01\x00\x00\x00"
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)
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##
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# Image plugin for Windows metafiles.
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class WmfStubImageFile(ImageFile.StubImageFile):
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format = "WMF"
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format_description = "Windows Metafile"
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def _open(self):
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# check placable header
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s = self.fp.read(80)
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if s[:6] == "\xd7\xcd\xc6\x9a\x00\x00":
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# placeable windows metafile
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# get units per inch
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inch = word(s, 14)
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# get bounding box
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x0 = short(s, 6); y0 = short(s, 8)
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x1 = short(s, 10); y1 = short(s, 12)
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# normalize size to 72 dots per inch
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size = (x1 - x0) * 72 / inch, (y1 - y0) * 72 / inch
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self.info["wmf_bbox"] = x0, y0, x1, y1
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self.info["dpi"] = 72
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# print self.mode, self.size, self.info
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# sanity check (standard metafile header)
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if s[22:26] != "\x01\x00\t\x00":
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raise SyntaxError("Unsupported WMF file format")
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elif long(s) == 1 and s[40:44] == " EMF":
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# enhanced metafile
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# get bounding box
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x0 = long(s, 8); y0 = long(s, 12)
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x1 = long(s, 16); y1 = long(s, 20)
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# get frame (in 0.01 millimeter units)
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frame = long(s, 24), long(s, 28), long(s, 32), long(s, 36)
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# normalize size to 72 dots per inch
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size = x1 - x0, y1 - y0
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# calculate dots per inch from bbox and frame
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xdpi = 2540 * (x1 - y0) / (frame[2] - frame[0])
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ydpi = 2540 * (y1 - y0) / (frame[3] - frame[1])
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self.info["wmf_bbox"] = x0, y0, x1, y1
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if xdpi == ydpi:
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self.info["dpi"] = xdpi
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else:
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self.info["dpi"] = xdpi, ydpi
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else:
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raise SyntaxError("Unsupported file format")
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self.mode = "RGB"
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self.size = size
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loader = self._load()
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if loader:
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loader.open(self)
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def _load(self):
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return _handler
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def _save(im, fp, filename):
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if _handler is None or not hasattr("_handler", "save"):
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raise IOError("WMF save handler not installed")
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_handler.save(im, fp, filename)
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#
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# --------------------------------------------------------------------
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# Registry stuff
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Image.register_open(WmfStubImageFile.format, WmfStubImageFile, _accept)
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Image.register_save(WmfStubImageFile.format, _save)
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Image.register_extension(WmfStubImageFile.format, ".wmf")
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Image.register_extension(WmfStubImageFile.format, ".emf")
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