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Re: How can we improve quality of text content rotated using CSS transform?

From: Robert O'Callahan <robert@ocallahan.org>
Date: Tue, 28 Jul 2009 13:14:24 +1200
Message-ID: <11e306600907271814t555f4007vf57522d875e35e9d@mail.gmail.com>
To: David Hyatt <hyatt@apple.com>
Cc: Biju <bijumaillist@gmail.com>, "www-style@w3.org list" <www-style@w3.org>
On Tue, Jul 28, 2009 at 6:23 AM, David Hyatt <hyatt@apple.com> wrote:

> entation issue and should just be bugs filed against Firefox and Safari (or
> Webkit).
> AFAIK the underlying problem here, at least in Firefox, is that the Windows
> GDI Cleartype renderer rounds the X and Y coordinates of glyphs to integers
> before rendering. If there was an easy fix, I'd use it, but I don't think
> there is. Rendering the scene untransformed (or possibly with a scale that
> approximates the true scale) and then transforming the resulting image would
> help in some cases, but not others. New APIs in Windows 7 might help ... but
> not for many users in the forseeable future.
> Robert is right.  This is a GDI issue.  If you try Safari on OS X, you will
> see that rotated text looks fine.

Actually we're having similar problems in OS X, Quartz is clearly rounding
some glyph positions to integers. Don't suppose you have a sekrit way to
turn that off? :)

"He was pierced for our transgressions, he was crushed for our iniquities;
the punishment that brought us peace was upon him, and by his wounds we are
healed. We all, like sheep, have gone astray, each of us has turned to his
own way; and the LORD has laid on him the iniquity of us all." [Isaiah
Received on Tuesday, 28 July 2009 01:15:05 UTC

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