Re: [ft-devel] implementing detection of hinting/rasterization errors in fonts

[Werner LEMBERG]

> I have started testing the new implementation of rasterization tests
> in font validator (background, planned in
> https://github.com/HinTak/Font-Validator/issues/5 ) and comparing
> how the new test behaves, with the old 2003 binary.
>
> [...] seems to be doing the equivalent of :
>
> ...
>           new_dist = org_dist;
>         }
>       }
>       else
>         new_dist = 0;
>
>       if( (new_dist == org_dist) && OTHER_YET_UNKNOWN_CONDITION)
>         EMIT_ERROR_MESSAGE();
> ...
>
> I.e. the older 2003 binary flags all the cases that Freetype
> identifies as errors, but also more. Can you make a guess of what
> those OTHER_YET_UNKNOWN_CONDITION might be?

Sorry, I can't.  Do you have examples of failing fonts?

Maybe Greg Hitchcock can help by looking into the MS rasterizer source
code.


    Werner