>> > How do the Apple and MS rendering engines behave?
>
>> Donno. MS supports CBDT fonts. I have not tested. Don't have a
>> Windows machine or access to one these days.
>
> The closely related EBDT code in Font Validator is available. That
> said, it is probably not very indicative of how MS rendering engine
> behaves, since it is all in C#. I think Microsoft's C code for EBDT
> likely came from Apple's bdat(?) code another decade before that, so
> Apple and MS rendering behavior may be similar.
You are probably misunderstanding. *Of course* Microsoft and Apple
support colour bitmap fonts (or rather, bitmap strikes). The question
is how those platforms behave for glyph IDs without a bitmap. I
suppose they do as Behdad suggest, this is, returning an empty bitmap
with the given advance width (or height).
Werner
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