Re: [ft-devel] Kerning support in freetype

[Dmitry Timoshkov]

"Russell Shaw" <address@hidden> wrote:

> > 1) freetype docs claim that FT_Get_Kerning returns values in 26.6 format,
> > but it looks like they are not.
>
> It is 26.6, because i've been using it.
>
> > 2) is it possible to get a number of all available kerning pairs? looking
> > at the freetype sources it seems ft has all the info, just there is no way
> > to get it.
>
> Probably no function to do that, because why would you need to?

I need it to implement behaviour of a win32 API GetKerningPairs, which
is able to return total amount of kerning pairs available. I don't see
why that info shouldn't be available for an application which wants to
cache it for any reason.

> > 3) returned kerning doesn't match Wndows one, probably due to 1).
>
> Must be a bug.

I'm attaching my test program. Using FreeType from CVS it prints:

face Arial Regular has kerning
kerning between 32 and 65 is -2:0
kerning between 32 and 84 is -1:0
kerning between 70 and 44 is -3:0

which is a bit small for a 1200 pixels font face.

Using Win32 API GetKerningPairsW I get:

wFirst 32, wSecond 65, iKernAmount -59
wFirst 32, wSecond 84, iKernAmount -19
wFirst 70, wSecond 44, iKernAmount -119

which looks reasonable for a 1200 pixel sized font face.

Thanks.

--
Dmitry.

ft_kern.c
Description: Text document