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Re: Patch for Mac OS X Text Drawing

From: YAMAMOTO Mitsuharu
Subject: Re: Patch for Mac OS X Text Drawing
Date: Sat, 22 Jan 2005 14:49:22 +0900
User-agent: Wanderlust/2.12.0 (Your Wildest Dreams) SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/21.3.50 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI)

>>>>> On Sat, 22 Jan 2005 13:55:46 +0900 (JST), Kenichi Handa <address@hidden> 
>>>>> said:

>> I'm not sure about other environments with anti-aliasing such as
>> Xft and ClearType.  Does anyone know about how over-drawing is
>> treated there?

> The tutorial of Xft says to clear or fill an area before drawing a
> text there as below:

> 5.3 Text Drawing

> Note that drawing the same string multiple times in the same place
> will generate the wrong result with AA text.

Thanks for the info.  The situation in Xft seems to be quite similar.

> the alternative is to use clipping and make sure that any areas
> within the clip region get cleared to the background before text is
> drawn on top.

The above sentence exactly explains what I intended by the patch.

                                     YAMAMOTO Mitsuharu

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