RE: [ft-devel] Force PMingLiU like font do HINTING

[Graham Asher]

FreeType can't normally 'emit warning messages' because it is a library, not
an app - it's up to the caller how to deal with errors. A new, well
documented, error code that the caller can choose to ignore is the way to
go, in my opinion.

Graham

-----Original Message-----
From: address@hidden
[mailto:address@hidden On
Behalf Of Werner LEMBERG
Sent: 04 December 2008 08:06
To: address@hidden
Cc: address@hidden
Subject: Re: [ft-devel] Force PMingLiU like font do HINTING


> The "tricky" fonts like PMingLiU need unpatented hinting.  Those
> fonts are unusable at all when programmers accidently turns on
> FT_LOAD_NO_HINTING.  So I think freetype should force fonts like
> those to ignore FT_LOAD_NO_HINTING.

This is a fundamental question.  My opinion is that shifting of glyph
elements using TrueType instructions clearly is (a kind of) hinting.
In other words, I don't like to change the current behaviour of
FreeType without good reasons.

However, it might be helpful if FreeType emits a warning message that
the font is probably unusable.  Hmm.

Opinions, please.  Maybe most of you disagree, so please chime in.


> And detecting of tricky font should be outside of this defines:
>
>     #if defined( TT_CONFIG_OPTION_UNPATENTED_HINTING    ) && \
>         !defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER )
>
> otherwise, the fonts are not detected on my debian box.

This is probably fixed already in the CVS:

  2008-11-05  Werner Lemberg  <address@hidden>

    * devel/ftoption.h, include/freetype/config/ftoption.h
      [TT_CONFIG_OPTION_BYTECODE_INTERPRETER]: Undefine
      TT_CONFIG_OPTION_UNPATENTED_HINTING.  This fixes the return
      value of `FT_Get_TrueType_Engine_Type' (and makes it work as
      documented).  Reported in bug #441638 of bugzilla.novell.com.

Please test.  Otherwise, please report the vales of those two macros
on your box.


    Werner


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