protected override void GetGlyphPosImpl(ActualFont actualFont, char[] buffer,
int startAt, int len,
List <GlyphPlan> glyphPlans)
{
NativeFont nativeFont = actualFont as NativeFont;
if (nativeFont == null)
{
nativeFont = ResolveForNativeFont(actualFont);
}
unsafe
{
//TODO: review proper array size here
int lim = len * 2;
ProperGlyph *properGlyphArray = stackalloc ProperGlyph[lim];
fixed(char *head = &buffer[0])
{
//we use font shaping engine here
NativeMyFontsLib.MyFtShaping(
nativeFont.NativeFontFace.HBFont,
head,
buffer.Length,
properGlyphArray);
}
//copy from proper glyph to
//create glyph plan
for (int i = 0; i < lim; ++i)
{
ProperGlyph propGlyph = properGlyphArray[i];
if (propGlyph.codepoint == 0)
{
//finish , just return
return;
}
GlyphPlan plan = new GlyphPlan((ushort)propGlyph.codepoint);
plan.advX = propGlyph.x_advance;
glyphPlans.Add(plan);
}
}
}
public static unsafe extern int MyFtShaping(IntPtr my_hb_ft_font,
char *text,
int charCount,
ProperGlyph *properGlyphs);
