Re: "Bold" effect when anti-aliased glyphs are overwritten

[Jason Rumney]

Chong Yidong wrote:
> Currently, the foreground of these redrawn glyphs is drawn directly
> without erasing the existing glyph.  This is because we generally don't
> want to redraw the background, since that might in turn overwrite THIS
> glyph's neighbors.  Without anti-aliasing, this procedure is obviously
> unproblematic.
>   
The usual way to solve such problems is to use clipping to only erase 
and draw the parts of the neighboring glyphs that need redrawing.
I thought I had seen such code when porting the new font backend to 
Windows, but perhaps I am misremembering.