Changeset 727

Timestamp:

01/30/06 10:03:31 (3 years ago)

Author:

mfenniak

Message:

Add PageObject?.compressContentStreams function to reduce the size of pages.

Files:

• pypdf/trunk/pyPdf/filters.py (modified) (1 diff)
• pypdf/trunk/pyPdf/generic.py (modified) (1 diff)
• pypdf/trunk/pyPdf/pdf.py (modified) (2 diffs)

pypdf/trunk/pyPdf/filters.py

@@ -75 +75 @@
-        return data
-    decode = staticmethod(decode)
+
+    def encode(data):
+        return zlib.compress(data)
+    encode = staticmethod(encode)
-
-class ASCIIHexDecode(object):

pypdf/trunk/pyPdf/generic.py

@@ -396 +396 @@
-    initializeFromDictionary = staticmethod(initializeFromDictionary)
-
+    def flateEncode(self):
+        if self.has_key("/Filter"):
+            f = self["/Filter"]
+            if isinstance(f, ArrayObject):
+                f.insert(0, NameObject("/FlateDecode"))
+            else:
+                newf = ArrayObject()
+                newf.append(NameObject("/FlateDecode"))
+                newf.append(f)
+                f = newf
+        else:
+            f = NameObject("/FlateDecode")
+        retval = EncodedStreamObject()
+        retval[NameObject("/Filter")] = f
+        retval._data = filters.FlateDecode.encode(self._data)
+        return retval
+
-
-class DecodedStreamObject(StreamObject):

pypdf/trunk/pyPdf/pdf.py

@@ -591 +591 @@
-        self[NameObject('/Resources')] = newResources
-
+    def compressContentStreams(self):
+        """
+        Join all content streams and apply a FlateDecode filter to decrease
+        the stream's size.
+
+        Stability: Added in v1.6, will exist for all v1.x releases thereafter.
+        However, if content stream compression is ever handled in a different
+        and/or more transparent way, this function may not do anything.
+        """
+        content = self["/Contents"].getObject()
+        if not isinstance(content, ContentStream):
+            content = ContentStream(content)
+        self[NameObject("/Contents")] = content.flateEncode()
+
+
-addRectangleAccessor(PageObject, "mediaBox", "/MediaBox", (),
-        """A rectangle, expressed in default user space units, defining the
@@ -703 +718 @@
-    page1.mergePage(input3.getPage(0))
-
+    page1.compressContentStreams()
+
-    output.addPage(page1)
-    output.write(file("test\\merge-test.pdf", "wb"))