<br><div class="gmail_quote">On Tue, Oct 6, 2009 at 7:33 PM, Robert O'Callahan <span dir="ltr"><<a href="mailto:robert@ocallahan.org">robert@ocallahan.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">On Wed, Oct 7, 2009 at 8:58 AM, Freddie Witherden <span dir="ltr"><<a href="mailto:freddie@witherden.org" target="_blank">freddie@witherden.org</a>></span> wrote:<br></div><div class="gmail_quote"><div class="im">
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I believe that basic, 1/3 of a pixel, subpixel positing could be<br>
implemented in Cairo without a huge amount of work. It would of course<br>
only be applicable when subpixel rendering is enabled. Since Cairo and<br>
Pango both already use fractional co-ordinates this should not break<br>
backwards compatibility.<br>
<br>
Both Quartz (OS X) and ClearType (Windows) support this already.<br></blockquote></div><div><br>You mean the Windows WPF ClearType rasterizer? AFAIK GDI Cleartype does not support this.<br></div></div></blockquote><div><br>
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.<br>
<br>-Rob<br></div></div>