[Cairo] Color transforms

[Keith Packard]

Around 18 o'clock on Jul 18, Owen Taylor wrote:

> So, there is no point in getting too fancy with the part that
> isn't "draw these glyphs at these positions".

That's the plan -- some lame UTF-8 based API for applications that aren't 
wise enough to find a real text layout system, and then support for 
setting specific glyphs at specific locations.

The UTF-8 API will probably do font merging right down inside cairo so 
that applications will always get that.  I'm wondering how I can use this 
same code to accelerate this operation in Pango -- my plan is to use a 
single level hash to map unicode -> glyph/font so that I don't have to 
walk the sorted list of fonts for glyphs I've already found.

-keith