#include "precomp.hpp"

#include "ts_tags.hpp"

#include <map>
#include <iostream>
#include <fstream>

#if defined _WIN32
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
#endif

#ifdef HAVE_CUDA
#include "opencv2/core/cuda.hpp"
#endif

#ifdef __ANDROID__
# include <sys/time.h>
#endif

using namespace cvtest;
using namespace perf;

int64 TestBase::timeLimitDefault = 0;
unsigned int TestBase::iterationsLimitDefault = UINT_MAX;

// Item [0] will be considered the default implementation.
static std::vector<std::string> available_impls;

static std::string  param_impl;

static enum PERF_STRATEGY strategyForce = PERF_STRATEGY_DEFAULT;
static enum PERF_STRATEGY strategyModule = PERF_STRATEGY_SIMPLE;

static double       param_max_outliers;
static double       param_max_deviation;
static unsigned int param_min_samples;
static unsigned int param_force_samples;
static double       param_time_limit;
static bool         param_write_sanity;
static bool         param_verify_sanity;
#ifdef CV_COLLECT_IMPL_DATA
static bool         param_collect_impl;
#endif
#ifdef ENABLE_INSTRUMENTATION
static int          param_instrument;
#endif

namespace cvtest {
extern bool         test_ipp_check;
}

#ifdef HAVE_CUDA
static int          param_cuda_device;
#endif

#ifdef __ANDROID__
static int          param_affinity_mask;
static bool         log_power_checkpoints;

#include <sys/syscall.h>
#include <pthread.h>
#include <cerrno>
static void setCurrentThreadAffinityMask(int mask)
{
    pid_t pid=gettid();
    int syscallres=syscall(__NR_sched_setaffinity, pid, sizeof(mask), &mask);
    if (syscallres)
    {
        int err=errno;
        CV_UNUSED(err);
        LOGE("Error in the syscall setaffinity: mask=%d=0x%x err=%d=0x%x", mask, mask, err, err);
    }
}
#endif

static double perf_stability_criteria = 0.03; // 3%

namespace {

class PerfEnvironment: public ::testing::Environment
{
public:
    void TearDown()
    {
        cv::setNumThreads(-1);
    }
};

} // namespace

static void randu(cv::Mat& m)
{
    const int bigValue = 0x00000FFF;
    if (m.depth() < CV_32F)
    {
        int minmax[] = {0, 256};
        cv::Mat mr = cv::Mat(m.rows, (int)(m.cols * m.elemSize()), CV_8U, m.ptr(), m.step[0]);
        cv::randu(mr, cv::Mat(1, 1, CV_32S, minmax), cv::Mat(1, 1, CV_32S, minmax + 1));
    }
    else if (m.depth() == CV_32F)
    {
        //float minmax[] = {-FLT_MAX, FLT_MAX};
        float minmax[] = {-bigValue, bigValue};
        cv::Mat mr = m.reshape(1);
        cv::randu(mr, cv::Mat(1, 1, CV_32F, minmax), cv::Mat(1, 1, CV_32F, minmax + 1));
    }
    else
    {
        //double minmax[] = {-DBL_MAX, DBL_MAX};
        double minmax[] = {-bigValue, bigValue};
        cv::Mat mr = m.reshape(1);
        cv::randu(mr, cv::Mat(1, 1, CV_64F, minmax), cv::Mat(1, 1, CV_64F, minmax + 1));
    }
}

/*****************************************************************************************\
*                       inner exception class for early termination
\*****************************************************************************************/

class PerfEarlyExitException: public cv::Exception {};

/*****************************************************************************************\
*                                   ::perf::Regression
\*****************************************************************************************/

Regression& Regression::instance()
{
    static Regression single;
    return single;
}

Regression& Regression::add(TestBase* test, const std::string& name, cv::InputArray array, double eps, ERROR_TYPE err)
{
    if(test) test->setVerified();
    return instance()(name, array, eps, err);
}

Regression& Regression::addMoments(TestBase* test, const std::string& name, const cv::Moments& array, double eps, ERROR_TYPE err)
{
    int len = (int)sizeof(cv::Moments) / sizeof(double);
    cv::Mat m(1, len, CV_64F, (void*)&array);

    return Regression::add(test, name, m, eps, err);
}

Regression& Regression::addKeypoints(TestBase* test, const std::string& name, const std::vector<cv::KeyPoint>& array, double eps, ERROR_TYPE err)
{
    int len = (int)array.size();
    cv::Mat pt      (len, 1, CV_32FC2, len ? (void*)&array[0].pt : 0,       sizeof(cv::KeyPoint));
    cv::Mat size    (len, 1, CV_32FC1, len ? (void*)&array[0].size : 0,     sizeof(cv::KeyPoint));
    cv::Mat angle   (len, 1, CV_32FC1, len ? (void*)&array[0].angle : 0,    sizeof(cv::KeyPoint));
    cv::Mat response(len, 1, CV_32FC1, len ? (void*)&array[0].response : 0, sizeof(cv::KeyPoint));
    cv::Mat octave  (len, 1, CV_32SC1, len ? (void*)&array[0].octave : 0,   sizeof(cv::KeyPoint));
    cv::Mat class_id(len, 1, CV_32SC1, len ? (void*)&array[0].class_id : 0, sizeof(cv::KeyPoint));

    return Regression::add(test, name + "-pt",       pt,       eps, ERROR_ABSOLUTE)
                                (name + "-size",     size,     eps, ERROR_ABSOLUTE)
                                (name + "-angle",    angle,    eps, ERROR_ABSOLUTE)
                                (name + "-response", response, eps, err)
                                (name + "-octave",   octave,   eps, ERROR_ABSOLUTE)
                                (name + "-class_id", class_id, eps, ERROR_ABSOLUTE);
}

Regression& Regression::addMatches(TestBase* test, const std::string& name, const std::vector<cv::DMatch>& array, double eps, ERROR_TYPE err)
{
    int len = (int)array.size();
    cv::Mat queryIdx(len, 1, CV_32SC1, len ? (void*)&array[0].queryIdx : 0, sizeof(cv::DMatch));
    cv::Mat trainIdx(len, 1, CV_32SC1, len ? (void*)&array[0].trainIdx : 0, sizeof(cv::DMatch));
    cv::Mat imgIdx  (len, 1, CV_32SC1, len ? (void*)&array[0].imgIdx : 0,   sizeof(cv::DMatch));
    cv::Mat distance(len, 1, CV_32FC1, len ? (void*)&array[0].distance : 0, sizeof(cv::DMatch));

    return Regression::add(test, name + "-queryIdx", queryIdx, DBL_EPSILON, ERROR_ABSOLUTE)
                                (name + "-trainIdx", trainIdx, DBL_EPSILON, ERROR_ABSOLUTE)
                                (name + "-imgIdx",   imgIdx,   DBL_EPSILON, ERROR_ABSOLUTE)
                                (name + "-distance", distance, eps, err);
}

void Regression::Init(const std::string& testSuitName, const std::string& ext)
{
    instance().init(testSuitName, ext);
}

void Regression::init(const std::string& testSuitName, const std::string& ext)
{
    if (!storageInPath.empty())
    {
        LOGE("Subsequent initialization of Regression utility is not allowed.");
        return;
    }

#ifndef WINRT
    const char *data_path_dir = getenv("OPENCV_TEST_DATA_PATH");
#else
    const char *data_path_dir = OPENCV_TEST_DATA_PATH;
#endif

    cvtest::addDataSearchSubDirectory("");
    cvtest::addDataSearchSubDirectory(testSuitName);

    const char *path_separator = "/";

    if (data_path_dir)
    {
        int len = (int)strlen(data_path_dir)-1;
        if (len < 0) len = 0;
        std::string path_base = (data_path_dir[0] == 0 ? std::string(".") : std::string(data_path_dir))
                + (data_path_dir[len] == '/' || data_path_dir[len] == '\\' ? "" : path_separator)
                + "perf"
                + path_separator;

        storageInPath = path_base + testSuitName + ext;
        storageOutPath = path_base + testSuitName;
    }
    else
    {
        storageInPath = testSuitName + ext;
        storageOutPath = testSuitName;
    }

    suiteName = testSuitName;

    try
    {
        if (storageIn.open(storageInPath, cv::FileStorage::READ))
        {
            rootIn = storageIn.root();
            if (storageInPath.length() > 3 && storageInPath.substr(storageInPath.length()-3) == ".gz")
                storageOutPath += "_new";
            storageOutPath += ext;
        }
    }
    catch(const cv::Exception&)
    {
        LOGE("Failed to open sanity data for reading: %s", storageInPath.c_str());
    }

    if(!storageIn.isOpened())
        storageOutPath = storageInPath;
}

Regression::Regression() : regRNG(cv::getTickCount())//this rng should be really random
{
}

Regression::~Regression()
{
    if (storageIn.isOpened())
        storageIn.release();
    if (storageOut.isOpened())
    {
        if (!currentTestNodeName.empty())
            storageOut << "}";
        storageOut.release();
    }
}

cv::FileStorage& Regression::write()
{
    if (!storageOut.isOpened() && !storageOutPath.empty())
    {
        int mode = (storageIn.isOpened() && storageInPath == storageOutPath)
                ? cv::FileStorage::APPEND : cv::FileStorage::WRITE;
        storageOut.open(storageOutPath, mode);
        if (!storageOut.isOpened())
        {
            LOGE("Could not open \"%s\" file for writing", storageOutPath.c_str());
            storageOutPath.clear();
        }
        else if (mode == cv::FileStorage::WRITE && !rootIn.empty())
        {
            //TODO: write content of rootIn node into the storageOut
        }
    }
    return storageOut;
}

std::string Regression::getCurrentTestNodeName()
{
    const ::testing::TestInfo* const test_info =
      ::testing::UnitTest::GetInstance()->current_test_info();

    if (test_info == 0)
        return "undefined";

    std::string nodename = std::string(test_info->test_case_name()) + "--" + test_info->name();
    size_t idx = nodename.find_first_of('/');
    if (idx != std::string::npos)
        nodename.erase(idx);

    const char* type_param = test_info->type_param();
    if (type_param != 0)
        (nodename += "--") += type_param;

    const char* value_param = test_info->value_param();
    if (value_param != 0)
        (nodename += "--") += value_param;

    for(size_t i = 0; i < nodename.length(); ++i)
        if (!isalnum(nodename[i]) && '_' != nodename[i])
            nodename[i] = '-';

    return nodename;
}

bool Regression::isVector(cv::InputArray a)
{
    return a.kind() == cv::_InputArray::STD_VECTOR_MAT || a.kind() == cv::_InputArray::STD_VECTOR_VECTOR ||
           a.kind() == cv::_InputArray::STD_VECTOR_UMAT;
}

double Regression::getElem(cv::Mat& m, int y, int x, int cn)
{
    switch (m.depth())
    {
    case CV_8U: return *(m.ptr<unsigned char>(y, x) + cn);
    case CV_8S: return *(m.ptr<signed char>(y, x) + cn);
    case CV_16U: return *(m.ptr<unsigned short>(y, x) + cn);
    case CV_16S: return *(m.ptr<signed short>(y, x) + cn);
    case CV_32S: return *(m.ptr<signed int>(y, x) + cn);
    case CV_32F: return *(m.ptr<float>(y, x) + cn);
    case CV_64F: return *(m.ptr<double>(y, x) + cn);
    default: return 0;
    }
}

void Regression::write(cv::Mat m)
{
    if (!m.empty() && m.dims < 2) return;

    double min, max;
    cv::minMaxIdx(m, &min, &max);
    write() << "min" << min << "max" << max;

    write() << "last" << "{" << "x" << m.size.p[1] - 1 << "y" << m.size.p[0] - 1
        << "val" << getElem(m, m.size.p[0] - 1, m.size.p[1] - 1, m.channels() - 1) << "}";

    int x, y, cn;
    x = regRNG.uniform(0, m.size.p[1]);
    y = regRNG.uniform(0, m.size.p[0]);
    cn = regRNG.uniform(0, m.channels());
    write() << "rng1" << "{" << "x" << x << "y" << y;
    if(cn > 0) write() << "cn" << cn;
    write() << "val" << getElem(m, y, x, cn) << "}";

    x = regRNG.uniform(0, m.size.p[1]);
    y = regRNG.uniform(0, m.size.p[0]);
    cn = regRNG.uniform(0, m.channels());
    write() << "rng2" << "{" << "x" << x << "y" << y;
    if (cn > 0) write() << "cn" << cn;
    write() << "val" << getElem(m, y, x, cn) << "}";
}

void Regression::verify(cv::FileNode node, cv::Mat actual, double eps, std::string argname, ERROR_TYPE err)
{
    if (!actual.empty() && actual.dims < 2) return;

    double expect_min = (double)node["min"];
    double expect_max = (double)node["max"];

    if (err == ERROR_RELATIVE)
        eps *= std::max(std::abs(expect_min), std::abs(expect_max));

    double actual_min, actual_max;
    cv::minMaxIdx(actual, &actual_min, &actual_max);

    ASSERT_NEAR(expect_min, actual_min, eps)
            << argname << " has unexpected minimal value" << std::endl;
    ASSERT_NEAR(expect_max, actual_max, eps)
            << argname << " has unexpected maximal value" << std::endl;

    cv::FileNode last = node["last"];
    double actual_last = getElem(actual, actual.size.p[0] - 1, actual.size.p[1] - 1, actual.channels() - 1);
    int expect_cols = (int)last["x"] + 1;
    int expect_rows = (int)last["y"] + 1;
    ASSERT_EQ(expect_cols, actual.size.p[1])
            << argname << " has unexpected number of columns" << std::endl;
    ASSERT_EQ(expect_rows, actual.size.p[0])
            << argname << " has unexpected number of rows" << std::endl;

    double expect_last = (double)last["val"];
    ASSERT_NEAR(expect_last, actual_last, eps)
            << argname << " has unexpected value of the last element" << std::endl;

    cv::FileNode rng1 = node["rng1"];
    int x1 = rng1["x"];
    int y1 = rng1["y"];
    int cn1 = rng1["cn"];

    double expect_rng1 = (double)rng1["val"];
    // it is safe to use x1 and y1 without checks here because we have already
    // verified that mat size is the same as recorded
    double actual_rng1 = getElem(actual, y1, x1, cn1);

    ASSERT_NEAR(expect_rng1, actual_rng1, eps)
            << argname << " has unexpected value of the ["<< x1 << ":" << y1 << ":" << cn1 <<"] element" << std::endl;

    cv::FileNode rng2 = node["rng2"];
    int x2 = rng2["x"];
    int y2 = rng2["y"];
    int cn2 = rng2["cn"];

    double expect_rng2 = (double)rng2["val"];
    double actual_rng2 = getElem(actual, y2, x2, cn2);

    ASSERT_NEAR(expect_rng2, actual_rng2, eps)
            << argname << " has unexpected value of the ["<< x2 << ":" << y2 << ":" << cn2 <<"] element" << std::endl;
}

void Regression::write(cv::InputArray array)
{
    write() << "kind" << array.kind();
    write() << "type" << array.type();
    if (isVector(array))
    {
        int total = (int)array.total();
        int idx = regRNG.uniform(0, total);
        write() << "len" << total;
        write() << "idx" << idx;

        cv::Mat m = array.getMat(idx);

        if (m.total() * m.channels() < 26) //5x5 or smaller
            write() << "val" << m;
        else
            write(m);
    }
    else
    {
        if (array.total() * array.channels() < 26) //5x5 or smaller
            write() << "val" << array.getMat();
        else
            write(array.getMat());
    }
}

static int countViolations(const cv::Mat& expected, const cv::Mat& actual, const cv::Mat& diff, double eps, double* max_violation = 0, double* max_allowed = 0)
{
    cv::Mat diff64f;
    diff.reshape(1).convertTo(diff64f, CV_64F);

    cv::Mat expected_abs = cv::abs(expected.reshape(1));
    cv::Mat actual_abs = cv::abs(actual.reshape(1));
    cv::Mat maximum, mask;
    cv::max(expected_abs, actual_abs, maximum);
    cv::multiply(maximum, cv::Vec<double, 1>(eps), maximum, CV_64F);
    cv::compare(diff64f, maximum, mask, cv::CMP_GT);

    int v = cv::countNonZero(mask);

    if (v > 0 && max_violation != 0 && max_allowed != 0)
    {
        int loc[10] = {0};
        cv::minMaxIdx(maximum, 0, max_allowed, 0, loc, mask);
        *max_violation = diff64f.at<double>(loc[0], loc[1]);
    }

    return v;
}

void Regression::verify(cv::FileNode node, cv::InputArray array, double eps, ERROR_TYPE err)
{
    int expected_kind = (int)node["kind"];
    int expected_type = (int)node["type"];
    ASSERT_EQ(expected_kind, array.kind()) << "  Argument \"" << node.name() << "\" has unexpected kind";
    ASSERT_EQ(expected_type, array.type()) << "  Argument \"" << node.name() << "\" has unexpected type";

    cv::FileNode valnode = node["val"];
    if (isVector(array))
    {
        int expected_length = (int)node["len"];
        ASSERT_EQ(expected_length, (int)array.total()) << "  Vector \"" << node.name() << "\" has unexpected length";
        int idx = node["idx"];

        cv::Mat actual = array.getMat(idx);

        if (valnode.isNone())
        {
            ASSERT_LE((size_t)26, actual.total() * (size_t)actual.channels())
                    << "  \"" << node.name() << "[" <<  idx << "]\" has unexpected number of elements";
            verify(node, actual, eps, cv::format("%s[%d]", node.name().c_str(), idx), err);
        }
        else
        {
            cv::Mat expected;
            valnode >> expected;

            if(expected.empty())
            {
                ASSERT_TRUE(actual.empty())
                    << "  expected empty " << node.name() << "[" <<  idx<< "]";
            }
            else
            {
                ASSERT_EQ(expected.size(), actual.size())
                        << "  " << node.name() << "[" <<  idx<< "] has unexpected size";

                cv::Mat diff;
                cv::absdiff(expected, actual, diff);

                if (err == ERROR_ABSOLUTE)
                {
                    if (!cv::checkRange(diff, true, 0, 0, eps))
                    {
                        if(expected.total() * expected.channels() < 12)
                            std::cout << " Expected: " << std::endl << expected << std::endl << " Actual:" << std::endl << actual << std::endl;

                        double max;
                        cv::minMaxIdx(diff.reshape(1), 0, &max);

                        FAIL() << "  Absolute difference (=" << max << ") between argument \""
                               << node.name() << "[" <<  idx << "]\" and expected value is greater than " << eps;
                    }
                }
                else if (err == ERROR_RELATIVE)
                {
                    double maxv, maxa;
                    int violations = countViolations(expected, actual, diff, eps, &maxv, &maxa);
                    if (violations > 0)
                    {
                        if(expected.total() * expected.channels() < 12)
                            std::cout << " Expected: " << std::endl << expected << std::endl << " Actual:" << std::endl << actual << std::endl;

                        FAIL() << "  Relative difference (" << maxv << " of " << maxa << " allowed) between argument \""
                               << node.name() << "[" <<  idx << "]\" and expected value is greater than " << eps << " in " << violations << " points";
                    }
                }
            }
        }
    }
    else
    {
        if (valnode.isNone())
        {
            ASSERT_LE((size_t)26, array.total() * (size_t)array.channels())
                    << "  Argument \"" << node.name() << "\" has unexpected number of elements";
            verify(node, array.getMat(), eps, "Argument \"" + node.name() + "\"", err);
        }
        else
        {
            cv::Mat expected;
            valnode >> expected;
            cv::Mat actual = array.getMat();

            if(expected.empty())
            {
                ASSERT_TRUE(actual.empty())
                    << "  expected empty " << node.name();
            }
            else
            {
                ASSERT_EQ(expected.size(), actual.size())
                        << "  Argument \"" << node.name() << "\" has unexpected size";

                cv::Mat diff;
                cv::absdiff(expected, actual, diff);

                if (err == ERROR_ABSOLUTE)
                {
                    if (!cv::checkRange(diff, true, 0, 0, eps))
                    {
                        if(expected.total() * expected.channels() < 12)
                            std::cout << " Expected: " << std::endl << expected << std::endl << " Actual:" << std::endl << actual << std::endl;

                        double max;
                        cv::minMaxIdx(diff.reshape(1), 0, &max);

                        FAIL() << "  Difference (=" << max << ") between argument1 \"" << node.name()
                               << "\" and expected value is greater than " << eps;
                    }
                }
                else if (err == ERROR_RELATIVE)
                {
                    double maxv, maxa;
                    int violations = countViolations(expected, actual, diff, eps, &maxv, &maxa);
                    if (violations > 0)
                    {
                        if(expected.total() * expected.channels() < 12)
                            std::cout << " Expected: " << std::endl << expected << std::endl << " Actual:" << std::endl << actual << std::endl;

                        FAIL() << "  Relative difference (" << maxv << " of " << maxa << " allowed) between argument \"" << node.name()
                               << "\" and expected value is greater than " << eps << " in " << violations << " points";
                    }
                }
            }
        }
    }
}

Regression& Regression::operator() (const std::string& name, cv::InputArray array, double eps, ERROR_TYPE err)
{
    // exit if current test is already failed
    if(::testing::UnitTest::GetInstance()->current_test_info()->result()->Failed()) return *this;

    /*if(!array.empty() && array.depth() == CV_USRTYPE1)
    {
        ADD_FAILURE() << "  Can not check regression for CV_USRTYPE1 data type for " << name;
        return *this;
    }*/

    std::string nodename = getCurrentTestNodeName();

    cv::FileNode n = rootIn[nodename];
    if(n.isNone())
    {
        if(param_write_sanity)
        {
            if (nodename != currentTestNodeName)
            {
                if (!currentTestNodeName.empty())
                    write() << "}";
                currentTestNodeName = nodename;

                write() << nodename << "{";
            }
            // TODO: verify that name is alphanumeric, current error message is useless
            write() << name << "{";
            write(array);
            write() << "}";
        }
        else if(param_verify_sanity)
        {
            ADD_FAILURE() << "  No regression data for " << name << " argument, test node: " << nodename;
        }
    }
    else
    {
        cv::FileNode this_arg = n[name];
        if (!this_arg.isMap())
            ADD_FAILURE() << "  No regression data for " << name << " argument";
        else
            verify(this_arg, array, eps, err);
    }

    return *this;
}


/*****************************************************************************************\
*                                ::perf::performance_metrics
\*****************************************************************************************/
performance_metrics::performance_metrics()
{
    clear();
}

void performance_metrics::clear()
{
    bytesIn = 0;
    bytesOut = 0;
    samples = 0;
    outliers = 0;
    gmean = 0;
    gstddev = 0;
    mean = 0;
    stddev = 0;
    median = 0;
    min = 0;
    frequency = 0;
    terminationReason = TERM_UNKNOWN;
}

/*****************************************************************************************\
*                                   Performance validation results
\*****************************************************************************************/

static bool perf_validation_enabled = false;

static std::string perf_validation_results_directory;
static std::map<std::string, float> perf_validation_results;
static std::string perf_validation_results_outfile;

static double perf_validation_criteria = 0.03; // 3 %
static double perf_validation_time_threshold_ms = 0.1;
static int perf_validation_idle_delay_ms = 3000; // 3 sec

static void loadPerfValidationResults(const std::string& fileName)
{
    perf_validation_results.clear();
    std::ifstream infile(fileName.c_str());
    while (!infile.eof())
    {
        std::string name;
        float value = 0;
        if (!(infile >> value))
        {
            if (infile.eof())
                break; // it is OK
            std::cout << "ERROR: Can't load performance validation results from " << fileName << "!" << std::endl;
            return;
        }
        infile.ignore(1);
        if (!(std::getline(infile, name)))
        {
            std::cout << "ERROR: Can't load performance validation results from " << fileName << "!" << std::endl;
            return;
        }
        if (!name.empty() && name[name.size() - 1] == '\r') // CRLF processing on Linux
            name.resize(name.size() - 1);
        perf_validation_results[name] = value;
    }
    std::cout << "Performance validation results loaded from " << fileName << " (" << perf_validation_results.size() << " entries)" << std::endl;
}

static void savePerfValidationResult(const std::string& name, float value)
{
    perf_validation_results[name] = value;
}

static void savePerfValidationResults()
{
    if (!perf_validation_results_outfile.empty())
    {
        std::ofstream outfile((perf_validation_results_directory + perf_validation_results_outfile).c_str());
        std::map<std::string, float>::const_iterator i;
        for (i = perf_validation_results.begin(); i != perf_validation_results.end(); ++i)
        {
            outfile << i->second << ';';
            outfile << i->first << std::endl;
        }
        outfile.close();
        std::cout << "Performance validation results saved (" << perf_validation_results.size() << " entries)" << std::endl;
    }
}

class PerfValidationEnvironment : public ::testing::Environment
{
public:
    virtual ~PerfValidationEnvironment() {}
    virtual void SetUp() {}

    virtual void TearDown()
    {
        savePerfValidationResults();
    }
};

#ifdef ENABLE_INSTRUMENTATION
static void printShift(cv::instr::InstrNode *pNode, cv::instr::InstrNode* pRoot)
{
    // Print empty line for a big tree nodes
    if(pNode->m_pParent)
    {
        int parendIdx = pNode->m_pParent->findChild(pNode);
        if(parendIdx > 0 && pNode->m_pParent->m_childs[parendIdx-1]->m_childs.size())
        {
            printShift(pNode->m_pParent->m_childs[parendIdx-1]->m_childs[0], pRoot);
            printf("\n");
        }
    }

    // Check if parents have more childes
    std::vector<cv::instr::InstrNode*> cache;
    cv::instr::InstrNode *pTmpNode = pNode;
    while(pTmpNode->m_pParent && pTmpNode->m_pParent != pRoot)
    {
        cache.push_back(pTmpNode->m_pParent);
        pTmpNode = pTmpNode->m_pParent;
    }
    for(int i = (int)cache.size()-1; i >= 0; i--)
    {
        if(cache[i]->m_pParent)
        {
            if(cache[i]->m_pParent->findChild(cache[i]) == (int)cache[i]->m_pParent->m_childs.size()-1)
                printf("    ");
            else
                printf("|   ");
        }
    }
}

static double calcLocalWeight(cv::instr::InstrNode *pNode)
{
    if(pNode->m_pParent && pNode->m_pParent->m_pParent)
        return ((double)pNode->m_payload.m_ticksTotal*100/pNode->m_pParent->m_payload.m_ticksTotal);
    else
        return 100;
}

static double calcGlobalWeight(cv::instr::InstrNode *pNode)
{
    cv::instr::InstrNode* globNode = pNode;

    while(globNode->m_pParent && globNode->m_pParent->m_pParent)
        globNode = globNode->m_pParent;

    return ((double)pNode->m_payload.m_ticksTotal*100/(double)globNode->m_payload.m_ticksTotal);
}

static void printNodeRec(cv::instr::InstrNode *pNode, cv::instr::InstrNode *pRoot)
{
    printf("%s", (pNode->m_payload.m_funName.substr(0, 40) + ((pNode->m_payload.m_funName.size()>40)?"...":"")).c_str());

    // Write instrumentation flags
    if(pNode->m_payload.m_instrType != cv::instr::TYPE_GENERAL || pNode->m_payload.m_implType != cv::instr::IMPL_PLAIN)
    {
        printf("<");
        if(pNode->m_payload.m_instrType == cv::instr::TYPE_WRAPPER)
            printf("W");
        else if(pNode->m_payload.m_instrType == cv::instr::TYPE_FUN)
            printf("F");
        else if(pNode->m_payload.m_instrType == cv::instr::TYPE_MARKER)
            printf("MARK");

        if(pNode->m_payload.m_instrType != cv::instr::TYPE_GENERAL && pNode->m_payload.m_implType != cv::instr::IMPL_PLAIN)
            printf("_");

        if(pNode->m_payload.m_implType == cv::instr::IMPL_IPP)
            printf("IPP");
        else if(pNode->m_payload.m_implType == cv::instr::IMPL_OPENCL)
            printf("OCL");

        printf(">");
    }

    if(pNode->m_pParent)
    {
        printf(" - TC:%d C:%d", pNode->m_payload.m_threads, pNode->m_payload.m_counter);
        printf(" T:%.2fms", pNode->m_payload.getTotalMs());
        if(pNode->m_pParent->m_pParent)
            printf(" L:%.0f%% G:%.0f%%", calcLocalWeight(pNode), calcGlobalWeight(pNode));
    }
    printf("\n");

    {
        // Group childes by name
        for(size_t i = 1; i < pNode->m_childs.size(); i++)
        {
            if(pNode->m_childs[i-1]->m_payload.m_funName == pNode->m_childs[i]->m_payload.m_funName )
                continue;
            for(size_t j = i+1; j < pNode->m_childs.size(); j++)
            {
                if(pNode->m_childs[i-1]->m_payload.m_funName == pNode->m_childs[j]->m_payload.m_funName )
                {
                    cv::swap(pNode->m_childs[i], pNode->m_childs[j]);
                    i++;
                }
            }
        }
    }

    for(size_t i = 0; i < pNode->m_childs.size(); i++)
    {
        printShift(pNode->m_childs[i], pRoot);

        if(i == pNode->m_childs.size()-1)
            printf("\\---");
        else
            printf("|---");
        printNodeRec(pNode->m_childs[i], pRoot);
    }
}

template <typename T>
std::string to_string_with_precision(const T value, const int p = 3)
{
    std::ostringstream out;
    out << std::fixed << std::setprecision(p) << value;
    return out.str();
}

static cv::String nodeToString(cv::instr::InstrNode *pNode)
{
    cv::String string;
    if (pNode->m_payload.m_funName == "ROOT")
        string = pNode->m_payload.m_funName;
    else
    {
        string = "#";
        string += std::to_string((int)pNode->m_payload.m_instrType);
        string += pNode->m_payload.m_funName;
        string += " - L:";
        string += to_string_with_precision(calcLocalWeight(pNode));
        string += ", G:";
        string += to_string_with_precision(calcGlobalWeight(pNode));
    }
    string += "(";
    for(size_t i = 0; i < pNode->m_childs.size(); i++)
        string += nodeToString(pNode->m_childs[i]);
    string += ")";

    return string;
}

static uint64 getNodeTimeRec(cv::instr::InstrNode *pNode, cv::instr::TYPE type, cv::instr::IMPL impl)
{
    uint64 ticks = 0;

    if (pNode->m_pParent && (type < 0 || pNode->m_payload.m_instrType == type) && pNode->m_payload.m_implType == impl)
    {
        ticks = pNode->m_payload.m_ticksTotal;
        return ticks;
    }

    for(size_t i = 0; i < pNode->m_childs.size(); i++)
        ticks += getNodeTimeRec(pNode->m_childs[i], type, impl);

    return ticks;
}

static uint64 getImplTime(cv::instr::IMPL impl)
{
    uint64 ticks = 0;
    cv::instr::InstrNode *pRoot = cv::instr::getTrace();

    ticks = getNodeTimeRec(pRoot, cv::instr::TYPE_FUN, impl);

    return ticks;
}

static uint64 getTotalTime()
{
    uint64 ticks = 0;
    cv::instr::InstrNode *pRoot = cv::instr::getTrace();

    for(size_t i = 0; i < pRoot->m_childs.size(); i++)
        ticks += pRoot->m_childs[i]->m_payload.m_ticksTotal;

    return ticks;
}

::cv::String InstumentData::treeToString()
{
    cv::String string = nodeToString(cv::instr::getTrace());
    return string;
}

void InstumentData::printTree()
{
    printf("[ TRACE    ]\n");
    printNodeRec(cv::instr::getTrace(), cv::instr::getTrace());
#ifdef HAVE_IPP
    printf("\nIPP weight: %.1f%%", ((double)getImplTime(cv::instr::IMPL_IPP)*100/(double)getTotalTime()));
#endif
#ifdef HAVE_OPENCL
    printf("\nOPENCL weight: %.1f%%", ((double)getImplTime(cv::instr::IMPL_OPENCL)*100/(double)getTotalTime()));
#endif
    printf("\n[/TRACE    ]\n");
    fflush(stdout);
}
#endif

/*****************************************************************************************\
*                                   ::perf::TestBase
\*****************************************************************************************/


void TestBase::Init(int argc, const char* const argv[])
{
    std::vector<std::string> plain_only;
    plain_only.push_back("plain");
    TestBase::Init(plain_only, argc, argv);
}

void TestBase::Init(const std::vector<std::string> & availableImpls,
                 int argc, const char* const argv[])
{
    CV_TRACE_FUNCTION();

    available_impls = availableImpls;

    const std::string command_line_keys =
        "{   perf_max_outliers           |8        |percent of allowed outliers}"
        "{   perf_min_samples            |10       |minimal required numer of samples}"
        "{   perf_force_samples          |100      |force set maximum number of samples for all tests}"
        "{   perf_seed                   |809564   |seed for random numbers generator}"
        "{   perf_threads                |-1       |the number of worker threads, if parallel execution is enabled}"
        "{   perf_write_sanity           |false    |create new records for sanity checks}"
        "{   perf_verify_sanity          |false    |fail tests having no regression data for sanity checks}"
        "{   perf_impl                   |" + available_impls[0] +
                                                  "|the implementation variant of functions under test}"
        "{   perf_list_impls             |false    |list available implementation variants and exit}"
        "{   perf_run_cpu                |false    |deprecated, equivalent to --perf_impl=plain}"
        "{   perf_strategy               |default  |specifies performance measuring strategy: default, base or simple (weak restrictions)}"
        "{   perf_read_validation_results |        |specifies file name with performance results from previous run}"
        "{   perf_write_validation_results |       |specifies file name to write performance validation results}"
#ifdef __ANDROID__
        "{   perf_time_limit             |6.0      |default time limit for a single test (in seconds)}"
        "{   perf_affinity_mask          |0        |set affinity mask for the main thread}"
        "{   perf_log_power_checkpoints  |         |additional xml logging for power measurement}"
#else
        "{   perf_time_limit             |3.0      |default time limit for a single test (in seconds)}"
#endif
        "{   perf_max_deviation          |1.0      |}"
#ifdef HAVE_IPP
        "{   perf_ipp_check              |false    |check whether IPP works without failures}"
#endif
#ifdef CV_COLLECT_IMPL_DATA
        "{   perf_collect_impl           |false    |collect info about executed implementations}"
#endif
#ifdef ENABLE_INSTRUMENTATION
        "{   perf_instrument             |0        |instrument code to collect implementations trace: 1 - perform instrumentation; 2 - separate functions with the same name }"
#endif
        "{   help h                      |false    |print help info}"
#ifdef HAVE_CUDA
        "{   perf_cuda_device            |0        |run CUDA test suite onto specific CUDA capable device}"
        "{   perf_cuda_info_only         |false    |print an information about system and an available CUDA devices and then exit.}"
#endif
        "{ skip_unstable                 |false    |skip unstable tests }"

        CV_TEST_TAGS_PARAMS
    ;

    cv::CommandLineParser args(argc, argv, command_line_keys);
    if (args.get<bool>("help"))
    {
        args.printMessage();
        return;
    }

    ::testing::AddGlobalTestEnvironment(new PerfEnvironment);

    param_impl          = args.get<bool>("perf_run_cpu") ? "plain" : args.get<std::string>("perf_impl");
    std::string perf_strategy = args.get<std::string>("perf_strategy");
    if (perf_strategy == "default")
    {
        // nothing
    }
    else if (perf_strategy == "base")
    {
        strategyForce = PERF_STRATEGY_BASE;
    }
    else if (perf_strategy == "simple")
    {
        strategyForce = PERF_STRATEGY_SIMPLE;
    }
    else
    {
        printf("No such strategy: %s\n", perf_strategy.c_str());
        exit(1);
    }
    param_max_outliers  = std::min(100., std::max(0., args.get<double>("perf_max_outliers")));
    param_min_samples   = std::max(1u, args.get<unsigned int>("perf_min_samples"));
    param_max_deviation = std::max(0., args.get<double>("perf_max_deviation"));
    param_seed          = args.get<unsigned int>("perf_seed");
    param_time_limit    = std::max(0., args.get<double>("perf_time_limit"));
    param_force_samples = args.get<unsigned int>("perf_force_samples");
    param_write_sanity  = args.get<bool>("perf_write_sanity");
    param_verify_sanity = args.get<bool>("perf_verify_sanity");

#ifdef HAVE_IPP
    test_ipp_check      = !args.get<bool>("perf_ipp_check") ? getenv("OPENCV_IPP_CHECK") != NULL : true;
#endif
    testThreads         = args.get<int>("perf_threads");
#ifdef CV_COLLECT_IMPL_DATA
    param_collect_impl  = args.get<bool>("perf_collect_impl");
#endif
#ifdef ENABLE_INSTRUMENTATION
    param_instrument    = args.get<int>("perf_instrument");
#endif
#ifdef __ANDROID__
    param_affinity_mask   = args.get<int>("perf_affinity_mask");
    log_power_checkpoints = args.has("perf_log_power_checkpoints");
#endif

    bool param_list_impls = args.get<bool>("perf_list_impls");

    if (param_list_impls)
    {
        fputs("Available implementation variants:", stdout);
        for (size_t i = 0; i < available_impls.size(); ++i) {
            putchar(' ');
            fputs(available_impls[i].c_str(), stdout);
        }
        putchar('\n');
        exit(0);
    }

    if (std::find(available_impls.begin(), available_impls.end(), param_impl) == available_impls.end())
    {
        printf("No such implementation: %s\n", param_impl.c_str());
        exit(1);
    }

#ifdef CV_COLLECT_IMPL_DATA
    if(param_collect_impl)
        cv::setUseCollection(1);
    else
        cv::setUseCollection(0);
#endif
#ifdef ENABLE_INSTRUMENTATION
    if(param_instrument > 0)
    {
        if(param_instrument == 2)
            cv::instr::setFlags(cv::instr::getFlags()|cv::instr::FLAGS_EXPAND_SAME_NAMES);
        cv::instr::setUseInstrumentation(true);
    }
    else
        cv::instr::setUseInstrumentation(false);
#endif

#ifdef HAVE_CUDA

    bool printOnly        = args.get<bool>("perf_cuda_info_only");

    if (printOnly)
        exit(0);
#endif

    skipUnstableTests = args.get<bool>("skip_unstable");

    if (available_impls.size() > 1)
        printf("[----------]\n[   INFO   ] \tImplementation variant: %s.\n[----------]\n", param_impl.c_str()), fflush(stdout);

#ifdef HAVE_CUDA

    param_cuda_device      = std::max(0, std::min(cv::cuda::getCudaEnabledDeviceCount(), args.get<int>("perf_cuda_device")));

    if (param_impl == "cuda")
    {
        cv::cuda::DeviceInfo info(param_cuda_device);
        if (!info.isCompatible())
        {
            printf("[----------]\n[ FAILURE  ] \tDevice %s is NOT compatible with current CUDA module build.\n[----------]\n", info.name()), fflush(stdout);
            exit(-1);
        }

        cv::cuda::setDevice(param_cuda_device);

        printf("[----------]\n[ GPU INFO ] \tRun test suite on %s GPU.\n[----------]\n", info.name()), fflush(stdout);
    }
#endif

    {
#ifndef WINRT
        const char* path = getenv("OPENCV_PERF_VALIDATION_DIR");
#else
        const char* path = OPENCV_PERF_VALIDATION_DIR;
#endif
        if (path)
            perf_validation_results_directory = path;
    }

    std::string fileName_perf_validation_results_src = args.get<std::string>("perf_read_validation_results");
    if (!fileName_perf_validation_results_src.empty())
    {
        perf_validation_enabled = true;
        loadPerfValidationResults(perf_validation_results_directory + fileName_perf_validation_results_src);
    }

    perf_validation_results_outfile = args.get<std::string>("perf_write_validation_results");
    if (!perf_validation_results_outfile.empty())
    {
        perf_validation_enabled = true;
        ::testing::AddGlobalTestEnvironment(new PerfValidationEnvironment());
    }

    activateTestTags(args);

    if (!args.check())
    {
        args.printErrors();
        exit(1);
    }

    timeLimitDefault = param_time_limit == 0.0 ? 1 : (int64)(param_time_limit * cv::getTickFrequency());
    iterationsLimitDefault = param_force_samples == 0 ? UINT_MAX : param_force_samples;
}

void TestBase::RecordRunParameters()
{
    ::testing::Test::RecordProperty("cv_implementation", param_impl);
    ::testing::Test::RecordProperty("cv_num_threads", testThreads);

#ifdef HAVE_CUDA
    if (param_impl == "cuda")
    {
        cv::cuda::DeviceInfo info(param_cuda_device);
        ::testing::Test::RecordProperty("cv_cuda_gpu", info.name());
    }
#endif
}

std::string TestBase::getSelectedImpl()
{
    return param_impl;
}

enum PERF_STRATEGY TestBase::setModulePerformanceStrategy(enum PERF_STRATEGY strategy)
{
    enum PERF_STRATEGY ret = strategyModule;
    strategyModule = strategy;
    return ret;
}

enum PERF_STRATEGY TestBase::getCurrentModulePerformanceStrategy()
{
    return strategyForce == PERF_STRATEGY_DEFAULT ? strategyModule : strategyForce;
}

#ifdef _MSC_VER
# pragma warning(push)
# pragma warning(disable:4355)  // 'this' : used in base member initializer list
#endif
TestBase::TestBase(): testStrategy(PERF_STRATEGY_DEFAULT), declare(this)
{
    lastTime = totalTime = timeLimit = 0;
    nIters = currentIter = runsPerIteration = 0;
    minIters = param_min_samples;
    verified = false;
    perfValidationStage = 0;
}
#ifdef _MSC_VER
# pragma warning(pop)
#endif


void TestBase::declareArray(SizeVector& sizes, cv::InputOutputArray a, WarmUpType wtype)
{
    if (!a.empty())
    {
        sizes.push_back(std::pair<int, cv::Size>(getSizeInBytes(a), getSize(a)));
        warmup(a, wtype);
    }
    else if (a.kind() != cv::_InputArray::NONE)
        ADD_FAILURE() << "  Uninitialized input/output parameters are not allowed for performance tests";
}

void TestBase::warmup(cv::InputOutputArray a, WarmUpType wtype)
{
    CV_TRACE_FUNCTION();
    if (a.empty())
        return;
    else if (a.isUMat())
    {
        if (wtype == WARMUP_RNG || wtype == WARMUP_WRITE)
        {
            int depth = a.depth();
            if (depth == CV_8U)
                cv::randu(a, 0, 256);
            else if (depth == CV_8S)
                cv::randu(a, -128, 128);
            else if (depth == CV_16U)
                cv::randu(a, 0, 1024);
            else if (depth == CV_32F || depth == CV_64F || depth == CV_16F)
                cv::randu(a, -1.0, 1.0);
            else if (depth == CV_16S || depth == CV_32S)
                cv::randu(a, -4096, 4096);
            else
                CV_Error(cv::Error::StsUnsupportedFormat, "Unsupported format");
        }
        return;
    }
    else if (a.kind() != cv::_InputArray::STD_VECTOR_MAT && a.kind() != cv::_InputArray::STD_VECTOR_VECTOR)
        warmup_impl(a.getMat(), wtype);
    else
    {
        size_t total = a.total();
        for (size_t i = 0; i < total; ++i)
            warmup_impl(a.getMat((int)i), wtype);
    }
}

int TestBase::getSizeInBytes(cv::InputArray a)
{
    if (a.empty()) return 0;
    int total = (int)a.total();
    if (a.kind() != cv::_InputArray::STD_VECTOR_MAT && a.kind() != cv::_InputArray::STD_VECTOR_VECTOR)
        return total * CV_ELEM_SIZE(a.type());

    int size = 0;
    for (int i = 0; i < total; ++i)
        size += (int)a.total(i) * CV_ELEM_SIZE(a.type(i));

    return size;
}

cv::Size TestBase::getSize(cv::InputArray a)
{
    if (a.kind() != cv::_InputArray::STD_VECTOR_MAT && a.kind() != cv::_InputArray::STD_VECTOR_VECTOR)
        return a.size();
    return cv::Size();
}

PERF_STRATEGY TestBase::getCurrentPerformanceStrategy() const
{
    if (strategyForce == PERF_STRATEGY_DEFAULT)
        return (testStrategy == PERF_STRATEGY_DEFAULT) ? strategyModule : testStrategy;
    else
        return strategyForce;
}

bool TestBase::next()
{
    static int64 lastActivityPrintTime = 0;

    if (currentIter != (unsigned int)-1)
    {
        if (currentIter + 1 != times.size())
            ADD_FAILURE() << "  next() is called before stopTimer()";
    }
    else
    {
        lastActivityPrintTime = 0;
        metrics.clear();
    }

    cv::theRNG().state = param_seed; //this rng should generate same numbers for each run
    ++currentIter;

    bool has_next = false;

    do {
        CV_Assert(currentIter == times.size());
        if (currentIter == 0)
        {
            has_next = true;
            break;
        }

        if (getCurrentPerformanceStrategy() == PERF_STRATEGY_BASE)
        {
            has_next = currentIter < nIters && totalTime < timeLimit;
        }
        else
        {
            CV_Assert(getCurrentPerformanceStrategy() == PERF_STRATEGY_SIMPLE);
            if (totalTime - lastActivityPrintTime >= cv::getTickFrequency() * 10)
            {
                std::cout << '.' << std::endl;
                lastActivityPrintTime = totalTime;
            }
            if (currentIter >= nIters)
            {
                has_next = false;
                break;
            }
            if (currentIter < minIters)
            {
                has_next = true;
                break;
            }

            calcMetrics();

            if (fabs(metrics.mean) > 1e-6)
                has_next = metrics.stddev > perf_stability_criteria * fabs(metrics.mean);
            else
                has_next = true;
        }
    } while (false);

    if (perf_validation_enabled && !has_next)
    {
        calcMetrics();
        double median_ms = metrics.median * 1000.0f / metrics.frequency;

        const ::testing::TestInfo* const test_info = ::testing::UnitTest::GetInstance()->current_test_info();
        std::string name = (test_info == 0) ? "" :
                std::string(test_info->test_case_name()) + "--" + test_info->name();

        if (!perf_validation_results.empty() && !name.empty())
        {
            std::map<std::string, float>::iterator i = perf_validation_results.find(name);
            bool isSame = false;
            bool found = false;
            bool grow = false;
            if (i != perf_validation_results.end())
            {
                found = true;
                double prev_result = i->second;
                grow = median_ms > prev_result;
                isSame = fabs(median_ms - prev_result) <= perf_validation_criteria * fabs(median_ms);
                if (!isSame)
                {
                    if (perfValidationStage == 0)
                    {
                        printf("Performance is changed (samples = %d, median):\n    %.2f ms (current)\n    %.2f ms (previous)\n", (int)times.size(), median_ms, prev_result);
                    }
                }
            }
            else
            {
                if (perfValidationStage == 0)
                    printf("New performance result is detected\n");
            }
            if (!isSame)
            {
                if (perfValidationStage < 2)
                {
                    if (perfValidationStage == 0 && currentIter <= minIters * 3 && currentIter < nIters)
                    {
                        unsigned int new_minIters = std::max(minIters * 5, currentIter * 3);
                        printf("Increase minIters from %u to %u\n", minIters, new_minIters);
                        minIters = new_minIters;
                        has_next = true;
                        perfValidationStage++;
                    }
                    else if (found && currentIter >= nIters &&
                            median_ms > perf_validation_time_threshold_ms &&
                            (grow || metrics.stddev > perf_stability_criteria * fabs(metrics.mean)))
                    {
                        CV_TRACE_REGION("idle_delay");
                        printf("Performance is unstable, it may be a result of overheat problems\n");
                        printf("Idle delay for %d ms... \n", perf_validation_idle_delay_ms);
#if defined _WIN32
#ifndef WINRT_8_0
                        Sleep(perf_validation_idle_delay_ms);
#else
                        WaitForSingleObjectEx(GetCurrentThread(), perf_validation_idle_delay_ms, FALSE);
#endif
#else
                        usleep(perf_validation_idle_delay_ms * 1000);
#endif
                        has_next = true;
                        minIters = std::min(minIters * 5, nIters);
                        // reset collected samples
                        currentIter = 0;
                        times.clear();
                        metrics.clear();
                        perfValidationStage += 2;
                    }
                    if (!has_next)
                    {
                        printf("Assume that current result is valid\n");
                    }
                }
                else
                {
                    printf("Re-measured performance result: %.2f ms\n", median_ms);
                }
            }
        }

        if (!has_next && !name.empty())
        {
            savePerfValidationResult(name, (float)median_ms);
        }
    }

#ifdef __ANDROID__
    if (log_power_checkpoints)
    {
        timeval tim;
        gettimeofday(&tim, NULL);
        unsigned long long t1 = tim.tv_sec * 1000LLU + (unsigned long long)(tim.tv_usec / 1000.f);

        if (currentIter == 1) RecordProperty("test_start", cv::format("%llu",t1).c_str());
        if (!has_next) RecordProperty("test_complete", cv::format("%llu",t1).c_str());
    }
#endif

    return has_next;
}

void TestBase::warmup_impl(cv::Mat m, WarmUpType wtype)
{
    switch(wtype)
    {
    case WARMUP_READ:
        cv::sum(m.reshape(1));
        return;
    case WARMUP_WRITE:
        m.reshape(1).setTo(cv::Scalar::all(0));
        return;
    case WARMUP_RNG:
        randu(m);
        return;
    default:
        return;
    }
}

unsigned int TestBase::getTotalInputSize() const
{
    unsigned int res = 0;
    for (SizeVector::const_iterator i = inputData.begin(); i != inputData.end(); ++i)
        res += i->first;
    return res;
}

unsigned int TestBase::getTotalOutputSize() const
{
    unsigned int res = 0;
    for (SizeVector::const_iterator i = outputData.begin(); i != outputData.end(); ++i)
        res += i->first;
    return res;
}

bool TestBase::startTimer()
{
#ifdef ENABLE_INSTRUMENTATION
    if(currentIter == 0)
    {
        cv::instr::setFlags(cv::instr::getFlags()|cv::instr::FLAGS_MAPPING); // enable mapping for the first run
        cv::instr::resetTrace();
    }
#endif
    lastTime = cv::getTickCount();
    return true; // dummy true for conditional loop
}

void TestBase::stopTimer()
{
    int64 time = cv::getTickCount();
    if (lastTime == 0)
        ADD_FAILURE() << "  stopTimer() is called before startTimer()/next()";
    lastTime = time - lastTime;
    CV_Assert(lastTime >= 0);  // TODO: CV_Check* for int64
    totalTime += lastTime;
    times.push_back(lastTime);
    lastTime = 0;

#ifdef ENABLE_INSTRUMENTATION
    cv::instr::setFlags(cv::instr::getFlags()&~cv::instr::FLAGS_MAPPING); // disable mapping to decrease overhead for +1 run
#endif
}

performance_metrics& TestBase::calcMetrics()
{
    CV_Assert(metrics.samples <= (unsigned int)currentIter);
    if ((metrics.samples == (unsigned int)currentIter) || times.size() == 0)
        return metrics;

    metrics.bytesIn = getTotalInputSize();
    metrics.bytesOut = getTotalOutputSize();
    metrics.frequency = cv::getTickFrequency();
    metrics.samples = (unsigned int)times.size();
    metrics.outliers = 0;

    if (metrics.terminationReason != performance_metrics::TERM_INTERRUPT && metrics.terminationReason != performance_metrics::TERM_EXCEPTION)
    {
        if (currentIter == nIters)
            metrics.terminationReason = performance_metrics::TERM_ITERATIONS;
        else if (totalTime >= timeLimit)
            metrics.terminationReason = performance_metrics::TERM_TIME;
        else
            metrics.terminationReason = performance_metrics::TERM_UNKNOWN;
    }

    std::sort(times.begin(), times.end());

    TimeVector::const_iterator start = times.begin();
    TimeVector::const_iterator end = times.end();

    if (getCurrentPerformanceStrategy() == PERF_STRATEGY_BASE)
    {
        //estimate mean and stddev for log(time)
        double gmean = 0;
        double gstddev = 0;
        int n = 0;
        for(TimeVector::const_iterator i = times.begin(); i != times.end(); ++i)
        {
            double x = static_cast<double>(*i)/runsPerIteration;
            if (x < DBL_EPSILON) continue;
            double lx = log(x);

            ++n;
            double delta = lx - gmean;
            gmean += delta / n;
            gstddev += delta * (lx - gmean);
        }

        gstddev = n > 1 ? sqrt(gstddev / (n - 1)) : 0;

        //filter outliers assuming log-normal distribution
        //http://stackoverflow.com/questions/1867426/modeling-distribution-of-performance-measurements
        if (gstddev > DBL_EPSILON)
        {
            double minout = exp(gmean - 3 * gstddev) * runsPerIteration;
            double maxout = exp(gmean + 3 * gstddev) * runsPerIteration;
            while(*start < minout) ++start, ++metrics.outliers;
            do --end, ++metrics.outliers; while(*end > maxout);
            ++end, --metrics.outliers;
        }
    }
    else if (getCurrentPerformanceStrategy() == PERF_STRATEGY_SIMPLE)
    {
        metrics.outliers = static_cast<int>(times.size() * param_max_outliers / 100);
        for (unsigned int i = 0; i < metrics.outliers; i++)
            --end;
    }
    else
    {
        CV_Assert(false);
    }

    int offset = static_cast<int>(start - times.begin());

    metrics.min = static_cast<double>(*start)/runsPerIteration;
    //calc final metrics
    unsigned int n = 0;
    double gmean = 0;
    double gstddev = 0;
    double mean = 0;
    double stddev = 0;
    unsigned int m = 0;
    for(; start != end; ++start)
    {
        double x = static_cast<double>(*start)/runsPerIteration;
        if (x > DBL_EPSILON)
        {
            double lx = log(x);
            ++m;
            double gdelta = lx - gmean;
            gmean += gdelta / m;
            gstddev += gdelta * (lx - gmean);
        }
        ++n;
        double delta = x - mean;
        mean += delta / n;
        stddev += delta * (x - mean);
    }

    metrics.mean = mean;
    metrics.gmean = exp(gmean);
    metrics.gstddev = m > 1 ? sqrt(gstddev / (m - 1)) : 0;
    metrics.stddev = n > 1 ? sqrt(stddev / (n - 1)) : 0;
    metrics.median = (n % 2
            ? (double)times[offset + n / 2]
            : 0.5 * (times[offset + n / 2] + times[offset + n / 2 - 1])
            ) / runsPerIteration;

    return metrics;
}

void TestBase::validateMetrics()
{
    performance_metrics& m = calcMetrics();

    if (HasFailure()) return;

    ASSERT_GE(m.samples, 1u)
      << "  No time measurements was performed.\nstartTimer() and stopTimer() commands are required for performance tests.";

    if (getCurrentPerformanceStrategy() == PERF_STRATEGY_BASE)
    {
        EXPECT_GE(m.samples, param_min_samples)
          << "  Only a few samples are collected.\nPlease increase number of iterations or/and time limit to get reliable performance measurements.";

        if (m.gstddev > DBL_EPSILON)
        {
            EXPECT_GT(/*m.gmean * */1., /*m.gmean * */ 2 * sinh(m.gstddev * param_max_deviation))
              << "  Test results are not reliable ((mean-sigma,mean+sigma) deviation interval is greater than measured time interval).";
        }

        EXPECT_LE(m.outliers, std::max((unsigned int)cvCeil(m.samples * param_max_outliers / 100.), 1u))
          << "  Test results are not reliable (too many outliers).";
    }
    else if (getCurrentPerformanceStrategy() == PERF_STRATEGY_SIMPLE)
    {
        double mean = metrics.mean * 1000.0f / metrics.frequency;
        double median = metrics.median * 1000.0f / metrics.frequency;
        double min_value = metrics.min * 1000.0f / metrics.frequency;
        double stddev = metrics.stddev * 1000.0f / metrics.frequency;
        double percents = stddev / mean * 100.f;
        printf("[ PERFSTAT ]    (samples=%d   mean=%.2f   median=%.2f   min=%.2f   stddev=%.2f (%.1f%%))\n", (int)metrics.samples, mean, median, min_value, stddev, percents);
    }
    else
    {
        CV_Assert(false);
    }
}

void TestBase::reportMetrics(bool toJUnitXML)
{
    CV_TRACE_FUNCTION();

    performance_metrics& m = calcMetrics();

    CV_TRACE_ARG_VALUE(samples, "samples", (int64)m.samples);
    CV_TRACE_ARG_VALUE(outliers, "outliers", (int64)m.outliers);
    CV_TRACE_ARG_VALUE(median, "mean_ms", (double)(m.mean * 1000.0f / metrics.frequency));
    CV_TRACE_ARG_VALUE(median, "median_ms", (double)(m.median * 1000.0f / metrics.frequency));
    CV_TRACE_ARG_VALUE(stddev, "stddev_ms", (double)(m.stddev * 1000.0f / metrics.frequency));
    CV_TRACE_ARG_VALUE(stddev_percents, "stddev_percents", (double)(m.stddev / (double)m.mean * 100.0f));

    if (m.terminationReason == performance_metrics::TERM_SKIP_TEST)
    {
        if (toJUnitXML)
        {
            RecordProperty("custom_status", "skipped");
        }
    }
    else if (toJUnitXML)
    {
        RecordProperty("bytesIn", (int)m.bytesIn);
        RecordProperty("bytesOut", (int)m.bytesOut);
        RecordProperty("term", m.terminationReason);
        RecordProperty("samples", (int)m.samples);
        RecordProperty("outliers", (int)m.outliers);
        RecordProperty("frequency", cv::format("%.0f", m.frequency).c_str());
        RecordProperty("min", cv::format("%.0f", m.min).c_str());
        RecordProperty("median", cv::format("%.0f", m.median).c_str());
        RecordProperty("gmean", cv::format("%.0f", m.gmean).c_str());
        RecordProperty("gstddev", cv::format("%.6f", m.gstddev).c_str());
        RecordProperty("mean", cv::format("%.0f", m.mean).c_str());
        RecordProperty("stddev", cv::format("%.0f", m.stddev).c_str());
#ifdef ENABLE_INSTRUMENTATION
        if(cv::instr::useInstrumentation())
        {
            cv::String tree = InstumentData::treeToString();
            RecordProperty("functions_hierarchy", tree.c_str());
            RecordProperty("total_ipp_weight",    cv::format("%.1f", ((double)getImplTime(cv::instr::IMPL_IPP)*100/(double)getTotalTime())));
            RecordProperty("total_opencl_weight", cv::format("%.1f", ((double)getImplTime(cv::instr::IMPL_OPENCL)*100/(double)getTotalTime())));
            cv::instr::resetTrace();
        }
#endif
#ifdef CV_COLLECT_IMPL_DATA
        if(param_collect_impl)
        {
            RecordProperty("impl_ipp", (int)(implConf.ipp || implConf.icv));
            RecordProperty("impl_ocl", (int)implConf.ocl);
            RecordProperty("impl_plain", (int)implConf.plain);

            std::string rec_line;
            std::vector<cv::String> rec;
            rec_line.clear();
            rec = implConf.GetCallsForImpl(CV_IMPL_IPP|CV_IMPL_MT);
            for(int i=0; i<rec.size();i++ ){rec_line += rec[i].c_str(); rec_line += " ";}
            rec = implConf.GetCallsForImpl(CV_IMPL_IPP);
            for(int i=0; i<rec.size();i++ ){rec_line += rec[i].c_str(); rec_line += " ";}
            RecordProperty("impl_rec_ipp", rec_line.c_str());

            rec_line.clear();
            rec = implConf.GetCallsForImpl(CV_IMPL_OCL);
            for(int i=0; i<rec.size();i++ ){rec_line += rec[i].c_str(); rec_line += " ";}
            RecordProperty("impl_rec_ocl", rec_line.c_str());
        }
#endif
    }
    else
    {
        const ::testing::TestInfo* const test_info = ::testing::UnitTest::GetInstance()->current_test_info();
        const char* type_param = test_info->type_param();
        const char* value_param = test_info->value_param();

#if defined(__ANDROID__) && defined(USE_ANDROID_LOGGING)
        LOGD("[ FAILED   ] %s.%s", test_info->test_case_name(), test_info->name());
#endif

        if (type_param)  LOGD("type      = %11s", type_param);
        if (value_param) LOGD("params    = %11s", value_param);

        switch (m.terminationReason)
        {
        case performance_metrics::TERM_ITERATIONS:
            LOGD("termination reason:  reached maximum number of iterations");
            break;
        case performance_metrics::TERM_TIME:
            LOGD("termination reason:  reached time limit");
            break;
        case performance_metrics::TERM_INTERRUPT:
            LOGD("termination reason:  aborted by the performance testing framework");
            break;
        case performance_metrics::TERM_EXCEPTION:
            LOGD("termination reason:  unhandled exception");
            break;
        case performance_metrics::TERM_UNKNOWN:
        default:
            LOGD("termination reason:  unknown");
            break;
        };

#ifdef CV_COLLECT_IMPL_DATA
        if(param_collect_impl)
        {
            LOGD("impl_ipp =%11d", (int)(implConf.ipp || implConf.icv));
            LOGD("impl_ocl =%11d", (int)implConf.ocl);
            LOGD("impl_plain =%11d", (int)implConf.plain);

            std::string rec_line;
            std::vector<cv::String> rec;
            rec_line.clear();
            rec = implConf.GetCallsForImpl(CV_IMPL_IPP|CV_IMPL_MT);
            for(int i=0; i<rec.size();i++ ){rec_line += rec[i].c_str(); rec_line += " ";}
            rec = implConf.GetCallsForImpl(CV_IMPL_IPP);
            for(int i=0; i<rec.size();i++ ){rec_line += rec[i].c_str(); rec_line += " ";}
            LOGD("impl_rec_ipp =%s", rec_line.c_str());

            rec_line.clear();
            rec = implConf.GetCallsForImpl(CV_IMPL_OCL);
            for(int i=0; i<rec.size();i++ ){rec_line += rec[i].c_str(); rec_line += " ";}
            LOGD("impl_rec_ocl =%s", rec_line.c_str());
        }
#endif

        LOGD("bytesIn   =%11lu", (unsigned long)m.bytesIn);
        LOGD("bytesOut  =%11lu", (unsigned long)m.bytesOut);
        if (nIters == (unsigned int)-1 || m.terminationReason == performance_metrics::TERM_ITERATIONS)
            LOGD("samples   =%11u",  m.samples);
        else
            LOGD("samples   =%11u of %u", m.samples, nIters);
        LOGD("outliers  =%11u", m.outliers);
        LOGD("frequency =%11.0f", m.frequency);
        if (m.samples > 0)
        {
            LOGD("min       =%11.0f = %.2fms", m.min, m.min * 1e3 / m.frequency);
            LOGD("median    =%11.0f = %.2fms", m.median, m.median * 1e3 / m.frequency);
            LOGD("gmean     =%11.0f = %.2fms", m.gmean, m.gmean * 1e3 / m.frequency);
            LOGD("gstddev   =%11.8f = %.2fms for 97%% dispersion interval", m.gstddev, m.gmean * 2 * sinh(m.gstddev * 3) * 1e3 / m.frequency);
            LOGD("mean      =%11.0f = %.2fms", m.mean, m.mean * 1e3 / m.frequency);
            LOGD("stddev    =%11.0f = %.2fms", m.stddev, m.stddev * 1e3 / m.frequency);
        }
    }
}

void TestBase::SetUp()
{
    cv::theRNG().state = param_seed; // this rng should generate same numbers for each run

    if (testThreads >= 0)
        cv::setNumThreads(testThreads);
    else
        cv::setNumThreads(-1);

#ifdef __ANDROID__
    if (param_affinity_mask)
        setCurrentThreadAffinityMask(param_affinity_mask);
#endif

    verified = false;
    lastTime = 0;
    totalTime = 0;
    runsPerIteration = 1;
    nIters = iterationsLimitDefault;
    currentIter = (unsigned int)-1;
    timeLimit = timeLimitDefault;
    times.clear();
    metrics.terminationReason = performance_metrics::TERM_SKIP_TEST;
}

void TestBase::TearDown()
{
    if (metrics.terminationReason == performance_metrics::TERM_SKIP_TEST)
    {
        //LOGI("\tTest was skipped");
        //GTEST_SUCCEED() << "Test was skipped";
    }
    else
    {
        if (!HasFailure() && !verified)
            ADD_FAILURE() << "The test has no sanity checks. There should be at least one check at the end of performance test.";

        validateMetrics();
        if (HasFailure())
        {
            reportMetrics(false);

#ifdef ENABLE_INSTRUMENTATION
            if(cv::instr::useInstrumentation())
                InstumentData::printTree();
#endif
            return;
        }
    }

#ifdef CV_COLLECT_IMPL_DATA
    if(param_collect_impl)
    {
        implConf.ShapeUp();
        printf("[ I. FLAGS ] \t");
        if(implConf.ipp_mt)
        {
            if(implConf.icv) {printf("ICV_MT "); std::vector<cv::String> fun = implConf.GetCallsForImpl(CV_IMPL_IPP|CV_IMPL_MT); printf("("); for(int i=0; i<fun.size();i++ ){printf("%s ", fun[i].c_str());} printf(") "); }
            if(implConf.ipp) {printf("IPP_MT "); std::vector<cv::String> fun = implConf.GetCallsForImpl(CV_IMPL_IPP|CV_IMPL_MT); printf("("); for(int i=0; i<fun.size();i++ ){printf("%s ", fun[i].c_str());} printf(") "); }
        }
        else
        {
            if(implConf.icv) {printf("ICV "); std::vector<cv::String> fun = implConf.GetCallsForImpl(CV_IMPL_IPP); printf("("); for(int i=0; i<fun.size();i++ ){printf("%s ", fun[i].c_str());} printf(") "); }
            if(implConf.ipp) {printf("IPP "); std::vector<cv::String> fun = implConf.GetCallsForImpl(CV_IMPL_IPP); printf("("); for(int i=0; i<fun.size();i++ ){printf("%s ", fun[i].c_str());} printf(") "); }
        }
        if(implConf.ocl) {printf("OCL "); std::vector<cv::String> fun = implConf.GetCallsForImpl(CV_IMPL_OCL); printf("("); for(int i=0; i<fun.size();i++ ){printf("%s ", fun[i].c_str());} printf(") "); }
        if(implConf.plain) printf("PLAIN ");
        if(!(implConf.ipp_mt || implConf.icv || implConf.ipp || implConf.ocl || implConf.plain))
            printf("ERROR ");
        printf("\n");
        fflush(stdout);
    }
#endif

#ifdef ENABLE_INSTRUMENTATION
    if(cv::instr::useInstrumentation())
        InstumentData::printTree();
#endif

    reportMetrics(true);
}

std::string TestBase::getDataPath(const std::string& relativePath)
{
    if (relativePath.empty())
    {
        ADD_FAILURE() << "  Bad path to test resource";
        throw PerfEarlyExitException();
    }

#ifndef WINRT
    const char *data_path_dir = getenv("OPENCV_TEST_DATA_PATH");
#else
    const char *data_path_dir = OPENCV_TEST_DATA_PATH;
#endif
    const char *path_separator = "/";

    std::string path;
    if (data_path_dir)
    {
        int len = (int)strlen(data_path_dir) - 1;
        if (len < 0) len = 0;
        path = (data_path_dir[0] == 0 ? std::string(".") : std::string(data_path_dir))
                + (data_path_dir[len] == '/' || data_path_dir[len] == '\\' ? "" : path_separator);
    }
    else
    {
        path = ".";
        path += path_separator;
    }

    if (relativePath[0] == '/' || relativePath[0] == '\\')
        path += relativePath.substr(1);
    else
        path += relativePath;

    FILE* fp = fopen(path.c_str(), "r");
    if (fp)
        fclose(fp);
    else
    {
        ADD_FAILURE() << "  Requested file \"" << path << "\" does not exist.";
        throw PerfEarlyExitException();
    }
    return path;
}

void TestBase::RunPerfTestBody()
{
    metrics.clear();
    try
    {
#ifdef CV_COLLECT_IMPL_DATA
        if(param_collect_impl)
            implConf.Reset();
#endif
        this->PerfTestBody();
#ifdef CV_COLLECT_IMPL_DATA
        if(param_collect_impl)
            implConf.GetImpl();
#endif
    }
    catch(const PerfSkipTestException&)
    {
        metrics.terminationReason = performance_metrics::TERM_SKIP_TEST;
        return;
    }
    catch(const cvtest::details::SkipTestExceptionBase&)
    {
        metrics.terminationReason = performance_metrics::TERM_SKIP_TEST;
        throw;
    }
    catch(const PerfEarlyExitException&)
    {
        metrics.terminationReason = performance_metrics::TERM_INTERRUPT;
        return;//no additional failure logging
    }
    catch(const cv::Exception& e)
    {
        metrics.terminationReason = performance_metrics::TERM_EXCEPTION;
        #ifdef HAVE_CUDA
            if (e.code == cv::Error::GpuApiCallError)
                cv::cuda::resetDevice();
        #endif
        FAIL() << "Expected: PerfTestBody() doesn't throw an exception.\n  Actual: it throws cv::Exception:\n  " << e.what();
    }
    catch(const std::exception& e)
    {
        metrics.terminationReason = performance_metrics::TERM_EXCEPTION;
        FAIL() << "Expected: PerfTestBody() doesn't throw an exception.\n  Actual: it throws std::exception:\n  " << e.what();
    }
    catch(...)
    {
        metrics.terminationReason = performance_metrics::TERM_EXCEPTION;
        FAIL() << "Expected: PerfTestBody() doesn't throw an exception.\n  Actual: it throws...";
    }
}

/*****************************************************************************************\
*                          ::perf::TestBase::_declareHelper
\*****************************************************************************************/
TestBase::_declareHelper& TestBase::_declareHelper::iterations(unsigned int n)
{
    test->times.clear();
    test->times.reserve(n);
    test->nIters = std::min(n, TestBase::iterationsLimitDefault);
    test->currentIter = (unsigned int)-1;
    test->metrics.clear();
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::time(double timeLimitSecs)
{
    test->times.clear();
    test->currentIter = (unsigned int)-1;
    test->timeLimit = (int64)(timeLimitSecs * cv::getTickFrequency());
    test->metrics.clear();
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::tbb_threads(int n)
{
    cv::setNumThreads(n);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::runs(unsigned int runsNumber)
{
    test->runsPerIteration = runsNumber;
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::in(cv::InputOutputArray a1, WarmUpType wtype)
{
    if (!test->times.empty()) return *this;
    TestBase::declareArray(test->inputData, a1, wtype);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::in(cv::InputOutputArray a1, cv::InputOutputArray a2, WarmUpType wtype)
{
    if (!test->times.empty()) return *this;
    TestBase::declareArray(test->inputData, a1, wtype);
    TestBase::declareArray(test->inputData, a2, wtype);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::in(cv::InputOutputArray a1, cv::InputOutputArray a2, cv::InputOutputArray a3, WarmUpType wtype)
{
    if (!test->times.empty()) return *this;
    TestBase::declareArray(test->inputData, a1, wtype);
    TestBase::declareArray(test->inputData, a2, wtype);
    TestBase::declareArray(test->inputData, a3, wtype);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::in(cv::InputOutputArray a1, cv::InputOutputArray a2, cv::InputOutputArray a3, cv::InputOutputArray a4, WarmUpType wtype)
{
    if (!test->times.empty()) return *this;
    TestBase::declareArray(test->inputData, a1, wtype);
    TestBase::declareArray(test->inputData, a2, wtype);
    TestBase::declareArray(test->inputData, a3, wtype);
    TestBase::declareArray(test->inputData, a4, wtype);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::out(cv::InputOutputArray a1, WarmUpType wtype)
{
    if (!test->times.empty()) return *this;
    TestBase::declareArray(test->outputData, a1, wtype);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::out(cv::InputOutputArray a1, cv::InputOutputArray a2, WarmUpType wtype)
{
    if (!test->times.empty()) return *this;
    TestBase::declareArray(test->outputData, a1, wtype);
    TestBase::declareArray(test->outputData, a2, wtype);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::out(cv::InputOutputArray a1, cv::InputOutputArray a2, cv::InputOutputArray a3, WarmUpType wtype)
{
    if (!test->times.empty()) return *this;
    TestBase::declareArray(test->outputData, a1, wtype);
    TestBase::declareArray(test->outputData, a2, wtype);
    TestBase::declareArray(test->outputData, a3, wtype);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::out(cv::InputOutputArray a1, cv::InputOutputArray a2, cv::InputOutputArray a3, cv::InputOutputArray a4, WarmUpType wtype)
{
    if (!test->times.empty()) return *this;
    TestBase::declareArray(test->outputData, a1, wtype);
    TestBase::declareArray(test->outputData, a2, wtype);
    TestBase::declareArray(test->outputData, a3, wtype);
    TestBase::declareArray(test->outputData, a4, wtype);
    return *this;
}

TestBase::_declareHelper& TestBase::_declareHelper::strategy(enum PERF_STRATEGY s)
{
    test->testStrategy = s;
    return *this;
}

TestBase::_declareHelper::_declareHelper(TestBase* t) : test(t)
{
}

/*****************************************************************************************\
*                                  miscellaneous
\*****************************************************************************************/

namespace {
struct KeypointComparator
{
    std::vector<cv::KeyPoint>& pts_;
    comparators::KeypointGreater cmp;

    KeypointComparator(std::vector<cv::KeyPoint>& pts) : pts_(pts), cmp() {}

    bool operator()(int idx1, int idx2) const
    {
        return cmp(pts_[idx1], pts_[idx2]);
    }
};
}//namespace

void perf::sort(std::vector<cv::KeyPoint>& pts, cv::InputOutputArray descriptors)
{
    cv::Mat desc = descriptors.getMat();

    CV_Assert(pts.size() == (size_t)desc.rows);
    cv::AutoBuffer<int> idxs(desc.rows);

    for (int i = 0; i < desc.rows; ++i)
        idxs[i] = i;

    comparators::KeypointGreater cmp;
    std::sort(idxs.data(), idxs.data() + desc.rows, [&](int lhs, int rhs){ return cmp(pts[lhs], pts[rhs]); });

    std::vector<cv::KeyPoint> spts(pts.size());
    cv::Mat sdesc(desc.size(), desc.type());

    for(int j = 0; j < desc.rows; ++j)
    {
        spts[j] = pts[idxs[j]];
        cv::Mat row = sdesc.row(j);
        desc.row(idxs[j]).copyTo(row);
    }

    spts.swap(pts);
    sdesc.copyTo(desc);
}

/*****************************************************************************************\
*                                  ::perf::GpuPerf
\*****************************************************************************************/
bool perf::GpuPerf::targetDevice()
{
    return param_impl == "cuda";
}

/*****************************************************************************************\
*                                  ::perf::PrintTo
\*****************************************************************************************/
namespace perf
{

void PrintTo(const MatType& t, ::std::ostream* os)
{
    String name = typeToString(t);
    if (name.size() > 3 && name[0] == 'C' && name[1] == 'V' && name[2] == '_')
        *os << name.substr(3);
    else
        *os << name;
}

} //namespace perf

/*****************************************************************************************\
*                                  ::cv::PrintTo
\*****************************************************************************************/
namespace cv {

void PrintTo(const String& str, ::std::ostream* os)
{
    *os << "\"" << str << "\"";
}

void PrintTo(const Size& sz, ::std::ostream* os)
{
    *os << /*"Size:" << */sz.width << "x" << sz.height;
}

}  // namespace cv