[cairo] [Patch] make _color_to_short() use _cairo_fixed_from_double()

[Jorn Baayen]

Hi,

I attach a patch to make _color_to_short() in cairo-color.c use
_cairo_fixed_from_double(). This does not produce any measurable
speedup, but I'd say it's good for consistency.

Regards,

Jorn

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