Re: Calculating bounding boxes for rendered fonts

[John Cupitt <john cupitt ng-london org uk>]

Hi,

Ian King [ES] wrote:
> I need to be able to correctly calculate a bounding box for a string in 
> a particular rendered font.  At the moment I am creating a PangoLayout 
> with a particular string and font description, then calling 
> pango_layout_get_pixel_size.  This seems to work when the rendered font 
> is non-italic.  However, when I italicize the font description, the 
> query to pango_layout_get_pixel_size returns the same value, even though 
> the rendered font is wider than the returned dimensions.

I'm using

 pango_layout_get_extents( layout, &ink_rect, &logical_rect );

ink rect is the bounding box of the pixels that will be painted, logical_rect includes a bunch of extra spacing and allowance for ascenders / descenders / extra punctuation / other stuff I don't understand. PANGO_PIXELS() converts to pixel coordinates.

John