Re: [Devel] a simple question

[David Turner]

Hello,

Steve Claridge wrote:
> Apologies in advance if this question is a little to simple, I
> have been reading through the FreeType docs but cannot sort this
> problem out.
>
> I am using Freetype to calculate font metrics for creating a PDF
> document, here is a sample code segment (in pascal):
>
>   err := FT_New_Face(FT_Library, 'MyFont', 0, face);
>   if (err = 0) then
>   begin
>     FT_Set_Char_Size(face, 0, 33 * 64, 72, 72);
>
>     aHeight := face.size.metrics.Height div 64; //includes leading.
>     aAscent := face.size.metrics.Ascender div 64;
>     aDescent := face.size.metrics.Descender div 64;
>   end;
>
> > From my input height of 33 I get the following results:
>
> aHeight = 45
> aAscent = 30 
> aDescent = -7
>
> I would've thought that aAscent + absolute(aDescent) would've equalled
> the original height of 33, why doesn't it?

Because they're not directly related. Please read:

  http://www.freetype.org/freetype2/docs/glyphs/glyphs-2.html#section-1

Regards,

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