diff CONTRAT_SOCIAL @ 3045:6af44ca3beac

tools (common): helping method to calculate luminance: - a new `utils` module has been added for backend and frontends generic utilities - per_luminance method calculate the perceived luminance of a colour (is it dark or light?). This is useful to automatically select the suitable colour in a theme.
author Goffi <goffi@goffi.org>
date Tue, 01 Oct 2019 22:49:10 +0200
parents 1e3b1f9ad6e2
children 1d12e7a3401d
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