[cairo] Adding a boolean type

[Keith Packard]

Around 19 o'clock on Jan 31, Owen Taylor wrote:

> char vs. int: For Glib we picked int, to reduce the risk of
>   'GBoolean bool = flags & FLAG' traps, but mostly it doesn't matter,
>   and char seems to be more common in general.

I'd rather use 'int' -- I recall several mysterious problems in Xt 
resulting from the use of 'char' in that library.

>  CAIRO_FALSE vs. FALSE: For GLib, FALSE/TRUE are pretty much the 
>    only exception's to the namespace. We do:

Fwiw, Fontconfig uses FcFalse and FcTrue.  I have a slight preference for
the qualified names, but CAIRO_ is a lot longer than Fc...

-keith


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