Re: [Freetype] String bounding box -- HELP!

[Graham . Asher]

The bounding box of some text is determined by the outline, scaling,
rasterization and hinting. In other words, no, you can't get the bounding
box without rendering the text. Actually, that's not such a bad thing. If
you have a glyph caching system rendering will happen only the *first* time
you measure or draw a glyph, so the only overhead for subsequent times is
the cache latency.

In the EPOC OS, to which I ported FreeType, the bounding box of text is
measured before it is drawn *every* time the graphics system draws text.
The bounds are needed to optimise clipping. This causes no problem or
appreciable efficiency loss at all, for reasons I have just given.

Graham Asher
Symbian Ltd.




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