Fighting with the size of a font

[thom_schu gmx de]

Hi there,
with the code :

markupText = "<span font_family='Sans normal' foreground='black' size='12800'>" + text + "</span>";
pangoLayout->set_markup(markupText);
int width, height;
pangoLayout->get_pixel_size(width, height);

I expected a height of 12,5, but the height is 25.

And what does the 25 mean. I thought it is the height of the font in pixel.
But I have a Row with a height of 20 pixel and the string fits into this row, although get_pixel_size tells me the height of the font is 25.
(but its not 12,5 either, because the string almost fills the whole row, so it must be around 20)

thanks
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