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Re: [ft-devel] On contour directions and fill rules
From: |
Behdad Esfahbod |
Subject: |
Re: [ft-devel] On contour directions and fill rules |
Date: |
Fri, 20 Apr 2012 17:06:42 -0400 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.2.28) Gecko/20120306 Thunderbird/3.1.20 |
On 04/20/2012 12:31 AM, Werner LEMBERG wrote:
>
>> It competes with freetype-gl really. It's a GPU rasterizer. The
>> main different with freetype-gl is that I don't do any sampling, so
>> the glyphs are truly infinitely zoomable.
>
> Nice! No time to look at it more closely, but I've recently skimmed
> over a paper which uses wavelet transformation to achieve something
> similar
Yes, I saw that exchange, but have not read it yet.
> (the paper was mentioned on this list a few days ago). Maybe
> you are something into this direction also?
Not really, for this I just wanted to avoid signal processing by all means :).
Essentially, it's a generic SDF rasterizer, like freetype-gl is, but instead
of using a 2D sample to represent the SDF, we use circular-arc splines. So,
essentially, what GLyphy does is:
- Convert glyph outlines to bunch of circular arcs,
- Build a datastructure to make it fast finding which arc is closest given a
point,
- Upload these all to the GPU, do the math in the fragment shader.
The devil is in the corner cases of course. And in making it fast.
behdad
> Werner
>
- Re: [ft-devel] [patch] emboldening rework v1, (continued)
Re: [ft-devel] [patch] emboldening rework v1, Behdad Esfahbod, 2012/04/10
- Re: [ft-devel] [patch] emboldening rework v1, Alexei Podtelezhnikov, 2012/04/10
- Re: [ft-devel] [patch] emboldening rework v1, Behdad Esfahbod, 2012/04/10
- Re: [ft-devel] [patch] emboldening rework v1, Alexei Podtelezhnikov, 2012/04/12
- [ft-devel] On contour directions and fill rules (was Re: [patch] emboldening rework v1), Behdad Esfahbod, 2012/04/19
- Re: [ft-devel] On contour directions and fill rules, Werner LEMBERG, 2012/04/19
- Re: [ft-devel] On contour directions and fill rules, Behdad Esfahbod, 2012/04/19
- Re: [ft-devel] On contour directions and fill rules, Werner LEMBERG, 2012/04/20
- Re: [ft-devel] On contour directions and fill rules,
Behdad Esfahbod <=
- Re: [ft-devel] On contour directions and fill rules, Werner LEMBERG, 2012/04/23