[cairo] cairo backend for xpdf - first drop
keithp at keithp.com
Wed Dec 22 09:51:36 PST 2004
Around 10 o'clock on Dec 22, Carl Worth 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
When I hacked xpdf (badly) to use Xft, I ignored position information
except at word boundaries. I thought the results were an improvement,
although one would see occasional ragged margins resulting from a sequence
of mis-placed characters.
I know for myself the resulting improvement in readability more than made
up for the loss in rendering accuracy, but in an ideal world, we'd make
this a viewer option.
This also brings up which advance values cairo should present back to the
application; we can either return a 'linear' advance scaled from the
abstract outline, or the hinted advance returned by the rasterizer. The
former ensures consistent alignment of text on screen and page, the latter
provides better appearance on screen. I suspect the right answer is
'both', as which is used depends entirely on the application, and, as in
the above example, it might actually be best to 'mix' the two metrics so
that intra-word spacing is hinted and inter word spacing is linear.
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