On Mon, 12 Jan 2009, Bruno Fassino wrote
>In the Firefox source I see this
> DWORD len = GetGlyphOutlineW(dc, PRUnichar('x'), GGO_METRICS, &gm,
>0, nsnull, &kIdentityMatrix);
> ...
> mMetrics->xHeight = gm.gmptGlyphOrigin.y;
>
>I know nothing about this (I'm not even sure to have identified the
>correct place in the code), anyway this looks like a sort of rendering
>and retrieving of the data for a character.
Well spotted. I missed that one.
The function returns glyph information for "x" in a structure at a
memory address specified by &gm. One of the values returned in the
structure is the top-left x,y co-ordinates of a box that completely
encloses the glyph - so given that the box origin is 0,0 then
gm.gmptGlyphOrigin.y (xHeight) is the height of the box.
Now I'll have to update my web page :-)
--
Richard Mason
http://www.emdpi.com
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