[Devel] Re: inaccurate letter y-position

[Stefan Koch]

Hello Werner,

On 24.07.04, you wrote:

...

> Thanks, no I see the problem (for all others: Try `ftstring -m xhxXx 7
> arialnb.ttf').  I think it isn't a bug at all.  Reasons:
> 
>  . The hints in the font are not intended for anti-aliased rendering.
>    If you switch it off, all sizes render perfectly.  Looking at the
>    instruction dump created with TTX, the font calls GETINFO[] only
>    to test for rotation (if I interpret the code correctly), but not
>    for grayscale rendering.  Have you actually compared the FreeType
>    results with Windows output?

Not yet...

> 
>  . If you use the autohinter, the results are good also.
> 
>  . Rogier van Dalen has fixed some bugs in the TT interpreter which
>    makes your special case worse.
> 
> My conclusion is that you must not use native TrueType hinting for
> anti-aliased rendering.  While George has recently added support for
> handling vertical phantom points, we still don't have code for
> rendering natively hinted grayscale.  Volunteers welcome.

Thanks for all information!

Stefan