libcruft-util/test/colour.cpp

#include <cruft/util/colour.hpp>

#include <cruft/util/tap.hpp>


int
main (int, char**)
{
    cruft::TAP::logger tap;

    // Check casting works between intergral and floating formats
    {
        cruft::srgba<4,float> f {1.f};
        cruft::srgba<4,uint8_t> u {255};
        tap.expect_eq (f.cast<uint8_t> (), u, "cast float to u8");
        tap.expect_eq (u.cast<float> (), f, "cast u8 to float");
    }

    {
        cruft::srgba3f white {1, 1, 1};
        cruft::srgba3f black {0, 0, 0};
        cruft::srgba3f percent_50 { 0.735359f, 0.735356f, 0.735357f };

        tap.expect (max (scale_luminance (white, 1.f) - white) < 1e-5f, "unit luminance scaling for white");
        tap.expect (max (scale_luminance (white, 0.f) - black) < 1e-5f, "zero luminance scaling for white");
        tap.expect (max (scale_luminance (white, .5f) - percent_50) < 1e-5f, "half luminance scaling for white");
    }

    return tap.status ();
}