Currently in translate_curve_element() we always translate the curve
into a LUT. But in the future we'll be able to translate the curves to
parametric ones.
So move the current code to a new function
translate_curve_element_LUT(), so that in translate_curve_element() we
are able to call one of the two functions (_LUT() or _parametric()).
No behavior changes, just preparation for the upcoming patches.
Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
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