> This hook function (for librsvg) would work in the following manner:
> * create a cairo recording surface
> * render the glyph on that surface (you'll have to check whether to render 
> the whole document or a particular element)

This is unacceptable because it defeats the purpose. If the library
cannot return the bounding box without rendering, just forget it and
bail from ft_glyphslot_preset_bitmap. You and Behdad did however say
that say that it is available in some libraries.

> * get the bounds
> * perform any transformations on the bounds if necessary and then preset the 
> slot

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