Re: [Freetype] Re: Outline vertices

[David Turner]

Braden McDaniel wrote:
> On Sat, 23 Nov 2002 16:57:17 +0100, David Turner wrote:
> > That should work. Keep in mind that font designers can create glyphs that
> > extend outside of the EM square. You should use the global bounding box
> > instead if you're looking for the ability to constrain all coordinates
> > to a range like [0..1]
>
>
> Hm. I'm not sure of the implications of that. If a font designer decides
> that the glyphs should be outside the EM square, perhaps they should spill
> out of the "normal" area when I render them ... ?

Very frankly, you'd better use the global bounding box instead of the
EM. The latter is really a convenience for font designers as well as
a technical detail of font implementations. There is *no* aesthetical
meaning associated to it, thinking otherwise would be a mistake.

Applications should not use this as a basic for text layout and
measurement, only to apply scaling to device pixels when needed.

Regards,

- David Turner
- The FreeType Project  (www.freetype.org)