Re: [Freetype] Re: Glitch with monochrome renderer

[David Turner]

Hello Soeren,

Soeren Sandmann wrote:
> There is a small glitch using the monochrome renderer in FreeType
> 2.1.3. This image
>
>    http://www.daimi.au.dk/~sandmann/pictures/freetype-glitch.png
>
> 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 :-)

Regards,

- David Turner
- The FreeType Project  (www.freetype.org)