RE: [ft] east asian characters rendering incorrectly

[Aaron Brady]

Hello Jan,

I enabled the bytecode interpreter, and that fixed the problem. Thank
you for the advice.

Does anoyone know if there are any (preferably free) fonts out there
that can correctly create the outline in freetype with the interpreter
disabled? (for Chinese traditional/simplified, Japanese, and Korean).

Is the only other alternative to just stick to sizes where the font
already provides embeded outlines?

Thank you, very much, for your help.

Best regards,
Aaron



-----Original Message-----
From: Jan Slupski [mailto:address@hidden 
Sent: Wednesday, June 08, 2005 1:26 PM
To: Aaron Brady
Cc: address@hidden
Subject: Re: [ft] east asian characters rendering incorrectly


On Tue, 7 Jun 2005, Aaron Brady wrote:

> Hello,
>
> I'm having a problem with some freetype east Asian characters 
> rendering incorrectly. What happens is that as I scale the characters 
> they look okay sometimes, and at other times pieces seem to fall out 
> of them.
>
> I can provide more information, and I'm looking into it further, but I

> wanted to see if anybody had seen this problem.

Hi,

I would guess that this can be caused by the fact that you are not using
bytecode interpreter (that is disabled by default because it is
patented). Some Asian fonts relays strongly on bytecode interpreter and
cannot be 
rendered well without it.

If this is an issue, you may be getting right characters on certain font
sizes - there where the font provides embed outlines. But whenever font
engine has to create outline itself (normally only a few font sizes are
embed) it fails because of lack of bytecode interpreter.

You can test if this is the problem by turning on the bytecode
interpreter (compile time option - TT_CONFIG_OPTION_BYTECODE_INTERPRETER
in include/freetype/config/ftoption.h), and later use 
TT_CONFIG_OPTION_UNPATENTED_HINTING (same file - below) workaround.

Unfortunately unpatented hinting often fails rendering latin alphabet
(eg. Arial font), that normally works well without bytecode interpreter
at all.

Regards,
Jan

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