[cairo] Subpixel Positioning w/FreeType

Rob Arnold tellrob at gmail.com
Tue Oct 6 17:03:15 PDT 2009

On Tue, Oct 6, 2009 at 7:33 PM, Robert O'Callahan <robert at ocallahan.org>wrote:

> On Wed, Oct 7, 2009 at 8:58 AM, Freddie Witherden <freddie at witherden.org>wrote:
>> I believe that basic, 1/3 of a pixel, subpixel positing could be
>> implemented in Cairo without a huge amount of work. It would of course
>> only be applicable when subpixel rendering is enabled. Since Cairo and
>> Pango both already use fractional co-ordinates this should not break
>> backwards compatibility.
>> Both Quartz (OS X) and ClearType (Windows) support this already.
> You mean the Windows WPF ClearType rasterizer? AFAIK GDI Cleartype does not
> support this.

I'm pretty sure it's new in WPF/DirectWrite. But I'm not sure it uses 1/3
for sub pixel positioning. Before picking a fraction, it would be good to
find out what the other rasterizers have chosen for their pixel subdivision.

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