Add optional support for ansi_colours crate #75
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Add Colour::approx_rgb and Colour::into_256 which convert RGB variant into Fixed variant. This is useful when an application is running on a terminal which does not support True Colour control codes. By using the approximation the utility can fallback to using 256-colour palette which is more widely supported. Furthermore, add Colour::into_rgb method which performs conversion in the opposite direction. Naturally, the results for the first 16 colours aren’t exactly reliable (since those colours can be configured by the user) but indexes from the 6×6x6 cube or greyscale ramp will be returned correctly.
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Add Colour::approx_rgb and Colour::into_256 which convert RGB variant
into Fixed variant. This is useful when an application is running on
a terminal which does not support True Colour control codes. By using
the approximation the utility can fallback to using 256-colour palette
which is more widely supported.
Furthermore, add Colour::into_rgb method which performs conversion in
the opposite direction. Naturally, the results for the first 16
colours aren’t exactly reliable (since those colours can be configured
by the user) but indexes from the 6×6x6 cube or greyscale ramp will be
returned correctly.