[ft] FreeType 2.3.0/2.3.1 problems with Thai Language

[Chanon Sajjamanochai]

Hi,

I've been integrating FreeType with my game engine, and since I'm Thai, I've 
been trying Thai fonts/text with it. Since Thai is such a complicated 
language (3 levels of characters) it is a pretty good test case for a Font 
system.

I've been comparing my text output with that of PTK (a game library) which 
also uses FreeType.

What I found was when using PTK, the Thai text came out correctly, but in my 
engine it comes out with additional spacing between characters when there 
shouldn't be any.

I thought maybe PTK was using a different version of FreeType and so I tried 
changing the version of FreeType back to 2.2.1

Here is the difference:

In 2.2.1 you can see that the characters are close together as they should 
be.
http://www.viquasoft.com/chanon/freetype2.2.1.png

But in 2.3.1 the characters (especially the "floating" vowels and tone 
indicators in the Thai language) seem to have additional spacing when they 
shouldn't have any. This is unacceptable Thai text.
http://www.viquasoft.com/chanon/freetype2.3.1.png

This is using CordiaUPC which is a standard Thai/English font.

The only thing I changed in the above two versions is I linked to 
freetype231MT_D.lib instead of freetype221MT_D.lib, the rest of the code is 
exactly the same.

I'm not sure if I'm doing anything wrong, or if any of the rendering code 
needs to be changed for FreeType 2.3.1 so that it outputs text correctly.

Anyone have any ideas?

Thank you!,
Chanon