2013/3/26 mathog <mathog@...1176...>:
The strange thing is that the rectangle draw results in an XOR against the underlying glyphs. (Overlaps are not filled.) The reason this is bizarre is that when the code is modified so that the glyphs overlap each other (easy to do, just change the "g->_ctm" in ct.transform() to "aff") the glyphs do not XOR against each other. Use a string like "XO" to see this. Instead they just draw over each other, as one would expect for all of these draws.
If changing the fill rule has no effect, it's likely that your rectangle is counterdirectional with respect to the glyphs. Try reversing the order in which rectangle points are addedto the path.
If that doesn't help, you should draw the glyphs and the line in two separate calls to a temporary bitmap, then use it as a mask to paint the fill color.
Regards, Krzysztof