[cairo] Use 8-bit colour values internally

[MenTaLguY]

On Mon, 2005-08-22 at 23:37 -0400, Jason Dorje Short wrote:

> #define COLOR_INT_TO_SHORT(c) ((c) << 8)

If you're going to do that, it may as well be:

#define COLOR_INT_TO_SHORT(c) (((c) << 8) | (c))

which is (macro side-effects aside) equivalent to the correct: 

#define COLOR_INT_TO_SHORT(c) ((c) * 65535 / 255)

Which yields the expected 65535 for COLOR_INT_TO_SHORT(255), instead of
65280.

-mental
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