hyperion.ng/test/TestColorTransform.cpp

#include <iostream>
#include <cmath>

#include <hyperion/ColorTransform.h>

int main()
{
    {
        std::cout << "Testing linear transform" << std::endl;
        ColorTransform t;
        for (int i = 0; i < 256; ++i)
        {
            uint8_t input = i;
            uint8_t output = t.transform(input);
            uint8_t expected = input;

            if (output != expected)
            {
                std::cerr << "ERROR: input (" << (int)input << ") => output (" << (int)output << ") : expected (" << (int) expected << ")" << std::endl;
                return 1;
            }
            else
            {
                std::cerr << "OK: input (" << (int)input << ") => output (" << (int)output << ")" << std::endl;
            }
        }
    }

    {
        std::cout << "Testing threshold" << std::endl;
        ColorTransform t(.10, 1.0, 0.0, 1.0);
        for (int i = 0; i < 256; ++i)
        {
            uint8_t input = i;
            uint8_t output = t.transform(input);
            uint8_t expected = ((i/255.0) < t.getThreshold() ? 0 : output);

            if (output != expected)
            {
                std::cerr << "ERROR: input (" << (int)input << ") => output (" << (int)output << ") : expected (" << (int) expected << ")" << std::endl;
                return 1;
            }
            else
            {
                std::cerr << "OK: input (" << (int)input << ") => output (" << (int)output << ")" << std::endl;
            }
        }
    }

    {
        std::cout << "Testing blacklevel and whitelevel" << std::endl;
        ColorTransform t(0, 1.0, 0.2, 0.8);
        for (int i = 0; i < 256; ++i)
        {
            uint8_t input = i;
            uint8_t output = t.transform(input);
            uint8_t expected = (uint8_t)(input * (t.getWhitelevel()-t.getBlacklevel()) + 255 * t.getBlacklevel());

            if (output != expected)
            {
                std::cerr << "ERROR: input (" << (int)input << ") => output (" << (int)output << ") : expected (" << (int) expected << ")" << std::endl;
                return 1;
            }
            else
            {
                std::cerr << "OK: input (" << (int)input << ") => output (" << (int)output << ")" << std::endl;
            }
        }
    }

    {
        std::cout << "Testing gamma" << std::endl;
        ColorTransform t(0, 2.0, 0.0, 1.0);
        for (int i = 0; i < 256; ++i)
        {
            uint8_t input = i;
            uint8_t output = t.transform(input);
            uint8_t expected = (uint8_t)(255 * std::pow(i / 255.0, 2));

            if (output != expected)
            {
                std::cerr << "ERROR: input (" << (int)input << ") => output (" << (int)output << ") : expected (" << (int) expected << ")" << std::endl;
                return 1;
            }
            else
            {
                std::cerr << "OK: input (" << (int)input << ") => output (" << (int)output << ")" << std::endl;
            }
        }
    }

    return 0;
}