Function main

Source/Tools/ImageCompare/ImageCompare.cpp:382–453

}

int main(int argc, char** argv)
{
    args::ArgumentParser parser("Utility to compare images.");
    parser.helpParams.programName = "ImageCompare";
    args::HelpFlag helpFlag(parser, "help", "Display this help menu.", {'h', "help"});
    args::Flag listMetricsFlag(parser, "", "List available error metrics.", {'l'});
    args::ValueFlag<std::string> metricFlag(parser, "metric", "The error metric.", {'m'});
    args::ValueFlag<float> thresholdFlag(parser, "threshold", "The error threshold.", {'t'});
    args::Flag alphaFlag(parser, "", "Include alpha channel.", {'a'});
    args::ValueFlag<std::string> heatMapFlag(parser, "filename", "Generate error heat map.", {'e'});
    args::Positional<std::string> image1(parser, "image1", "The first image.", args::Options::Required);
    args::Positional<std::string> image2(parser, "image2", "The second image.", args::Options::Required);
    args::CompletionFlag completionFlag(parser, {"complete"});

    try
    {
        parser.ParseCLI(argc, argv);
    }
    catch (const args::Completion& e)
    {
        std::cout << e.what();
        return 0;
    }
    catch (const args::Help&)
    {
        std::cout << parser;
        return 0;
    }
    catch (const args::ParseError& e)
    {
        std::cerr << e.what() << std::endl;
        std::cerr << parser;
        return 1;
    }
    catch (const args::RequiredError& e)
    {
        std::cerr << e.what() << std::endl;
        std::cerr << parser;
        return 1;
    }

    if (listMetricsFlag)
    {
        printMetrics();
        return 0;
    }

    ErrorMetric metric = errorMetrics.front();
    if (metricFlag)
    {
        auto name = args::get(metricFlag);
        auto it =
            std::find_if(errorMetrics.begin(), errorMetrics.end(), [&name](const ErrorMetric& metric) { return metric.name == name; });
        if (it == errorMetrics.end())
        {
            std::cerr << "Unknown error metric '" << args::get(metricFlag) << "'." << std::endl;
            printMetrics(std::cerr);
            return 1;