[reportlab-users] ttfonts.py patch

[Robin Becker]

.......

Jerry, can you see if the following small patch improves your outcomes.

It seems that the error you were getting related to number of contours occurs 
when we see glyphLen == 0. That could be because it's not really right to assume 
that all fonts have all the glyphs in the 0-128 range.

I tried the following patch on ttfonts.py and that at least prevents the error 
from being raised.

@@ -735,6 +748,8 @@
              originalGlyphIdx = glyphMap[n]
              glyphPos = self.glyphPos[originalGlyphIdx]
              glyphLen = self.glyphPos[originalGlyphIdx + 1] - glyphPos
+            n += 1
+            if not glyphLen: continue
              self.seek(start + glyphPos)
              numberOfContours = self.read_short()
              if numberOfContours < 0:
@@ -757,7 +772,6 @@
                          self.skip(4)
                      elif flags & GF_WE_HAVE_A_TWO_BY_TWO:
                          self.skip(8)
-            n += 1

          numGlyphs = n = len(glyphMap)
          while n > 1 and self.hmetrics[n][0] == self.hmetrics[n - 1][0]:
-- 
Robin Becker