[cairo] cairo backend for xpdf - first drop

[Keith Packard]

Around 10 o'clock on Jan 10, Alexander Larsson wrote:

> > The question I had is whether xpdf has all the information it needs to
> > be able to compute this adjustment. The answer may be "it depends on
> > the document", but I would certainly like to see this happen when
> > possible.
> 
> I have no idea...

It almost always does -- the PDF file contains the Unicode values which 
are generally listed in the order they appear on the screen, so a 'smart' 
PDF viewer can fudge spacing around so that intra-word spaces respect the 
hinted metrics while inter-word spaces respect the unhinted metrics.

This works pretty well when I hacked xpdf a year ago or so.

-keith


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