[cairo] Cairo + Pango

[Keith Packard]

Around 15 o'clock on Aug 7, Bill Spitzak wrote:

> LCD screens should be treated by Cairo exactly like they have 3x resolution 
> in one direction. All transforms, etc, should be done as though this is the 
> final output device. The final stage of compositing selects from the r,g,b of 
> source and destination images according to x%3. The other trick is that thin 
> lines are made 3 pixels wide horizontally, and the font renderer also likes 
> to make things 3 pixels thick.

It's harder than that; you have to filter the output to balance color 
fringing and resolution.  We've demonstrated that you can effectively 
sub-pixel position glyphs, but you have to respect the pixel grid when 
computing stem widths, and you have to filter the output a bit.

-keith


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