[poppler] Qt4 Arthur

[Paul Gideon Dann]

On Wednesday 20 May 2009 23:25:01 Albert Astals Cid wrote:
> Can i have that pdf for local comparison?

Sorry, I'm afraid it's proprietary material.  (Probably shouldn't have used it 
for comparison; oh well!)  It's my copy of "Agile Web Development with Rails".  
I was reading it when I decided I had to get subpixel rendering working :)

However, you should be able to see the results in any PDF.

I've done further work on my patchset since my last e-mail.  After some 
hunting, I discovered how to enable FreeType's default LCD filter (FIR5) in 
the Cairo backend.  (By default Cairo uses the legacy version, hence the 
colour fringing.)  This function (in patch 4) relies on the LCD filtering 
patch for Cairo (http://aur.archlinux.org/packages/cairo-lcd/cairo-lcd/lcd-
filter.patch).

I've also added a further patch that enables slight hinting in the Cairo 
backend.  This has been suggested elsewhere, and does seem to sharpen text up 
a little.

Comparison of FIR5-filtered text with no hinting vs slight hinting:
No hinting: http://snurl.com/ihakt
Slight hinting: http://snurl.com/ihalk

Apologies for re-attaching the whole patchset -- I figured it would be cleaner 
than trying to track changes I made in each patch.

Most of this patchset is of course a quick hack to achieve the desired effect, 
but I do hope that the Cairo backend for Qt4 (patches 1+2) and the slight 
hinting (patch 5) will be considered for merging.  The rest will hopefully be 
helpful to anyone else wanting beautiful fonts in Okular right now.

Paul
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