Revision: 3708
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=3708&view=rev
Author: mdboom
Date: 2007-08-14 06:22:56 -0700 (Tue, 14 Aug 2007)
Log Message:
-----------
Make searching and copy/paste work in Pdf files (by adding a ToUnicode
CMap). Only works with Type42 fonts.
Modified Paths:
--------------
trunk/matplotlib/lib/matplotlib/backends/backend_pdf.py
Modified: trunk/matplotlib/lib/matplotlib/backends/backend_pdf.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_pdf.py 2007-08-14
07:07:45 UTC (rev 3707)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_pdf.py 2007-08-14
13:22:56 UTC (rev 3708)
@@ -485,6 +485,27 @@
os.path.splitext(os.path.basename(filename))[0],
symbol_name)
+ _identityToUnicodeCMap = """/CIDInit /ProcSet findresource begin
+12 dict begin
+begincmap
+/CIDSystemInfo
+<< /Registry (Adobe)
+ /Ordering (UCS)
+ /Supplement 0
+>> def
+/CMapName /Adobe-Identity-UCS def
+/CMapType 2 def
+1 begincodespacerange
+<0000> <ffff>
+endcodespacerange
+%d beginbfrange
+%s
+endbfrange
+endcmap
+CMapName currentdict /CMap defineresource pop
+end
+end"""
+
def embedTTF(self, filename, characters):
"""Embed the TTF font from the named file into the document."""
@@ -612,6 +633,7 @@
cidToGidMapObject = self.reserveObject('CIDToGIDMap stream')
fontfileObject = self.reserveObject('font file stream')
wObject = self.reserveObject('Type 0 widths')
+ toUnicodeMapObject = self.reserveObject('ToUnicode map')
cidFontDict = {
'Type' : Name('Font'),
@@ -631,7 +653,8 @@
'Subtype' : Name('Type0'),
'BaseFont' : ps_name,
'Encoding' : Name('Identity-H'),
- 'DescendantFonts' : [cidFontDictObject]
+ 'DescendantFonts' : [cidFontDictObject],
+ 'ToUnicode' : toUnicodeMapObject
}
# Make fontfile stream
@@ -652,9 +675,11 @@
self.endStream()
self.writeObject(length1Object, length1)
- # Make the 'W' (Widths) array and the CidToGidMap at the same time
+ # Make the 'W' (Widths) array, CidToGidMap and ToUnicode CMap
+ # at the same time
cid_to_gid_map = [u'\u0000'] * 65536
cmap = font.get_charmap()
+ unicode_mapping = []
widths = []
max_ccode = 0
for c in characters:
@@ -671,15 +696,28 @@
last_ccode = -2
w = []
max_width = 0
+ unicode_groups = []
for ccode, width in widths:
if ccode != last_ccode + 1:
w.append(ccode)
w.append([width])
+ unicode_groups.append([ccode, ccode])
else:
w[-1].append(width)
+ unicode_groups[-1][1] = ccode
max_width = max(max_width, width)
last_ccode = ccode
+ unicode_bfrange = []
+ for start, end in unicode_groups:
+ unicode_bfrange.append(
+ "<%04x> <%04x> [%s]" %
+ (start, end,
+ " ".join(["<%04x>" % x for x in range(start, end+1)])))
+ unicode_cmap = (self._identityToUnicodeCMap %
+ (len(unicode_groups),
+ "\n".join(unicode_bfrange)))
+
# CIDToGIDMap stream
cid_to_gid_map = "".join(cid_to_gid_map).encode("utf-16be")
self.beginStream(cidToGidMapObject.id,
@@ -688,6 +726,13 @@
self.currentstream.write(cid_to_gid_map)
self.endStream()
+ # ToUnicode CMap
+ self.beginStream(toUnicodeMapObject.id,
+ None,
+ {'Length': unicode_cmap})
+ self.currentstream.write(unicode_cmap)
+ self.endStream()
+
descriptor['MaxWidth'] = max_width
# Write everything out
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