Re: [ft-devel] freetype-py python binding to FontVal's FreeType backend.

[Hin-Tak Leung]

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On Wed, 29/3/17, Dave Crossland <address@hidden> wrote:
 
> Hi
> Cool, I hope this could be useful
> :)

>>    LD_LIBRARY_PATH=... PYTHONPATH=build/lib/:$
>>  PYTHONPATH  ./examples/font-diag.py examples/Vera.ttf

 
>> Size 10, SLOOP, Glyph ID 241, At ByteOffset 67 :
>>  _rast_W_FT_VALUE_OUT_OF_RANGE_ SLOOP
 
>> Size 10, SLOOP, Glyph ID 244, At ByteOffset 67 :
>> _rast_W_FT_VALUE_OUT_OF_RANGE_ SLOOP
 

A bit more detail. In the FontVal C# code, the _rast_* status symbol is further 
converted into the report as

W6020 "Setting the loop variable to zero is an error"

That information comes from Font-Validator/GenerateFValData/OurData.xml . You 
can do something like this
(sorry this is GNU grep syntax, which Mac OS X's grep is not):

grep -B1 -A3  _rast_W_FT_VALUE_OUT_OF_RANGE_  
Font-Validator/GenerateFValData/OurData.xml | grep -E '(helpID|atom|shortDesc)'
    helpID="W6020"
    atom="_rast_W_FT_VALUE_OUT_OF_RANGE_SLOOP"
    shortDesc="Setting the loop variable to zero is an error"


While looking up and doing a more friendly message, you can silence specific 
warning(s) that you don't like etc. (I know Werner does not like this one - it 
is the thing from hinting with ttfautohint).

I also filed a few bug reports with upstream freetype-py, and pushing a few 
python enhancements which was in the C# bridge or contributed by me a while 
back. As of now, if you use my fontval-diag branch of freetype-py, you should 
be able to do everything in python that the C# freetype bridge in FontVal does.