Re: [ft] Subpixel Hinting Patch

[Moony]

Yes, I used the grayscale hinting setting for a few reasons.  Perhaps 
I'm not completely understanding what I am doing, but my reasons were this:

- Currently in Freetype, there is a setting for grayscale vs. bi-level 
TT hinting, however in reality there exists only TT bi-level hinting.  
In other words, there is no difference in how the TT interpreter renders 
the outlines when grayscale is set versus bi-level (but maybe I'm wrong 
here).   The difference between grayscale and bi-level only comes into 
place during the rasterization.  So, since grayscale mode can more 
closely represent the subpixel hinting than bi-level hinting can, it 
made sense to me to have it replace the existing grayscale TT hinting 
(which is in fact just bi-level TT hinting).

- There is currently no "subpixel-hinting" flag that freetype/fontconfig 
can use, so until that could be put into place, replacing grayscale 
would allow this patch to do something during the interim.

- It can easily be changed, so I figured there was no harm.  ;)

I intended on separating subpixel out from grayscale, just not in this 
version of the patch.  You are absolutely correct that it should be 3 
different modes.


> Basically, all of your code looks very clean and promising.  However,
> it seems that you (completely?) replace the current gray-level hinting
> stuff with cleartype-like hinting.  Is this intended?  Shouldn't this
> be three different `modes'?  Bi-level, standard gray-level, and
> cleartype-like?
>
>