Re: [ft] anti-aliasing question

[Dave Calkins]

> > The comment indicates the enabling this flag activates sub-pixel
> > rendering, yet it later says that with this option on R=G=B.
> >      
> Ah, bad wording.  It means exactly the opposite.  In git, I've just
> changed it to the following:
>
>    [...]
>
>    This macro has no impact on the FreeType API, only on its
>    _implementation_.  For example, using FT_RENDER_MODE_LCD when
>    calling FT_Render_Glyph still generates a bitmap that is 3 times
>    wider than the original size in case this macro isn't defined;
>    however, each triplet of subpixels has R=G=B.
>
>
>      Werner
>
>
>    
Thanks for the clarification.

So if I do the below:

- enable FT_CONFIG_OPTION_SUBPIXEL_RENDERING in ftoption.h
- call FT_Library_SetLcdFilter with FT_LCD_FILTER_DEFAULT
- use FT_RENDER_MODE_LCD when calling FT_Render_Glyph

Then, the result of FT_Render_Glyph will be a 24-bit (8 bits for each 
red,green,blue) color image.  Rendering this as a 24-bit color image 
will take advantage of subpixel rendering and since I called 
FT_Library_SetLcdFilter it will already have been filtered to reduce 
color fringes.

Is the above correct?  Or is there some additional filtering I am 
supposed to do other than whats provided by FT_Library_SetLcdFilter?

Also, this results in a color image so I need to figure out how to best 
render that in GL, but thats a GL thing not a FreeType thing.