split platform

lib/python3.5/site-packages/PIL/WmfImagePlugin.py

@@ -0,0 +1,173 @@
+#
+# 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.
+#
+
+from PIL import Image, ImageFile, _binary
+
+__version__ = "0.2"
+
+_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(object):
+
+        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 -= 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")