[haiku-development] Re: Alternative implementation of subpixel rendering
- From: ian dumych <idumych@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Wed, 24 Nov 2010 14:25:04 -0800
As much as I'd love to see this feature in Haiku, I was under the impression
that free OSes don't normally ship this as it's a patented technology.
On Wed, Nov 24, 2010 at 2:21 PM, Claudio Leite <leitec@xxxxxxxxxxxx> wrote:
> Hello everyone,
>
> Way back in 2007 I attempted to implement subpixel text rendering on
> Haiku, but failed miserably due to lack of C++ and AGG experience.
> More recently, I've built upon Maxim and Stephan's excellent work. My main
> goal is to elegantly add an alternative to the average filter by using
> the filter provided in recent versions of FreeType (2.3.0+). This is
> what you see in recent versions of Ubuntu, among other systems. Having
> some formal training in typography, I tend to be rather picky about the
> way text looks onscreen, so about a year ago I crudely hacked in
> support that produced these results:
>
> http://staticky.com/haiku_aa/
>
> (I tried to match up the windows positions as best I could, since
> I had to recompile to enable the filter.)
>
> That early version had no gamma correction, and there were a couple of
> bugs you could see in the ftfil-nohint image. It's similar to what I
> think was Maxim's original filter that's still in the source, except
> it's softer and reduces color fringing to a very comfortable level.
> Since then I've experimented with the filter in various forms and
> separately implemented a gamma correction filter that could easily
> be plugged into the source.
>
> I'm in the process of re-implementing what I did last year except
> hopefully in a clean and modular manner such that it could be enabled or
> disabled as desired at runtime if compiled in. I have also experimented
> with using the filter for other uses. This could allow for the "holy
> grail" of AA: having all scalable graphics from AGG rendered with
> subpixel AA and this filter. My adaptation of the FT filter works on any
> antialiased bitmap rendered at 3x horizontal resolution (which is
> basically what the original does, but I've adapted it to work outside of
> FreeType).
>
> Of course, this stuff is highly subjective depending on people's eyes,
> monitors, preferences, etc., so making it easily switchable on/off is a
> big design goal for me. Would the Haiku development team be interested
> in such a patch, patent issues notwithstanding?
>
> Thank you for your time.
> -Claudio
>
>
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