[Freetype] Help with kerning troubles?

[Steve Johnson]

Greetings,

I'm having a problem getting kerning working correctly.  I seem to be
getting values for the kerning offsets that are about 1/4th as large as
they should be.  I've looked thru the docs and double-checked my code,
but I can't figure out where I'm losing that factor of 4.  Here's the
code in question:

        static FT_Error
        loadTrueTypeChar(TextInfo *tinf, CharInfo *chr, U16 thisChar,
U16 nextChar)
        {
                FT_Error                tterr;

                tterr = FT_Load_Char(tinf->Face, thisChar, 0);
                if (tterr==0 && nextChar!=0xffff)
                {
                        FT_Get_Kerning(tinf->Face, thisChar, nextChar,
0, &chr->kern);
                }
                else
                {
                        chr->kern.x = 0;
                        chr->kern.y = 0;
                }
                if (tterr==0)
                        tterr = FT_Render_Glyph(tinf->Face->glyph,
(tinf->Smooth? ft_render_mode_normal : ft_render_mode_mono));
                return(tterr);
        }



        *** This is the drawing code from my string drawing routine
that's looping over the string ***

        if ((FTErr=loadTrueTypeChar(tinf, &chr, ch1, ch2))==0)
        {
                if (tinf->Smooth)
                        FTErr = renderGlyph(&chr, Dst, xx, yy);
                else
                        FTErr = renderGlyphMono(&chr, Dst, xx, yy);
                xx += chr.glyph->advance.x+chr.kern.x;
                yy += chr.glyph->advance.y+chr.kern.y;
        }

This code works well except for the kerning.  If I multiply chr.kern.x
by 4 in the line that computes xx (third line from bottom), I get
roughly the right kerning behavior.

Can anyone see what I'm doing wrong, or suggest any possibilities?

TIA,

Steve Johnson
Manager of Software Engineering
Equilibrium Technologies, Inc.