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Re: [Freetype] Re: Glitch with monochrome renderer

From: David Turner
Subject: Re: [Freetype] Re: Glitch with monochrome renderer
Date: Wed, 19 Feb 2003 00:20:29 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3b) Gecko/20030210

Hello Soeren,

Soeren Sandmann wrote:
There is a small glitch using the monochrome renderer in FreeType
2.1.3. This image

shows a magnified version of the small 'w' of the Trebuchet font
rendered in monochrome with the bytecode interpreter enabled.

I have seen a small number of other such glitches; screenshots are
available on requests.

I suspect that these glitches are also present in FreeType 1.x, though
I didn't have time to test it (volunteer anyone ?)

If that is true, this simply means that the bytecode contained within
these fonts relies on the exact fixed-point computations performed by
the original Apple/Microsoft TrueType interpreter.

Certain things are incredibly influenced by rounding, like diagonals
when computing point by performing divisions and dot products.

Though I have spent considerable time in my youth to get the computations
"right" for Arial/Times/Courier, I have not the will to do that again to
fix a few small glitches in more recent fonts. Again, a kind volunteer is
needed to perform this massive task.

Anyway, you should consider ditching the bytecode interpreter :-)


- David Turner
- The FreeType Project  (

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