text: /*M///////////////////////////////////////////////////////////////////////////////////////
  //
  //  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
  //
  //  By downloading, copying, installing or using the software you agree to this license.
  //  If you do not agree to this license, do not download, install,
  //  copy or use the software.
  //
  //
  //                           License Agreement
  //                For Open Source Computer Vision Library
  //
  // Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
  // Copyright (C) 2009, Willow Garage Inc., all rights reserved.
  // Third party copyrights are property of their respective owners.
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  // are permitted provided that the following conditions are met:
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  //     this list of conditions and the following disclaimer.
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  //     this list of conditions and the following disclaimer in the documentation
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  //     derived from this software without specific prior written permission.
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  // any express or implied warranties, including, but not limited to, the implied
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  // and on any theory of liability, whether in contract, strict liability,
  // or tort (including negligence or otherwise) arising in any way out of
  // the use of this software, even if advised of the possibility of such damage.
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  //M*/
  
  #include "precomp.hpp"
  #include "opencv2/ts/cuda_perf.hpp"
  #include "opencv2/core/cuda.hpp"
  
  using namespace cv;
  using namespace std;
  
  namespace perf
  {
      Mat readImage(const string& fileName, int flags)
      {
          return imread(perf::TestBase::getDataPath(fileName), flags);
      }
  
      void PrintTo(const CvtColorInfo& info, std::ostream* os)
      {
          static const char* str[] =
          {
              "BGR2BGRA",
              "BGRA2BGR",
              "BGR2RGBA",
              "RGBA2BGR",
              "BGR2RGB",
              "BGRA2RGBA",
  
              "BGR2GRAY",
              "RGB2GRAY",
              "GRAY2BGR",
              "GRAY2BGRA",
              "BGRA2GRAY",
              "RGBA2GRAY",
  
              "BGR2BGR565",
              "RGB2BGR565",
              "BGR5652BGR",
              "BGR5652RGB",
              "BGRA2BGR565",
              "RGBA2BGR565",
              "BGR5652BGRA",
              "BGR5652RGBA",
  
              "GRAY2BGR565",
              "BGR5652GRAY",
  
              "BGR2BGR555",
              "RGB2BGR555",
              "BGR5552BGR",
              "BGR5552RGB",
              "BGRA2BGR555",
              "RGBA2BGR555",
              "BGR5552BGRA",
              "BGR5552RGBA",
  
              "GRAY2BGR555",
              "BGR5552GRAY",
  
              "BGR2XYZ",
              "RGB2XYZ",
              "XYZ2BGR",
              "XYZ2RGB",
  
              "BGR2YCrCb",
              "RGB2YCrCb",
              "YCrCb2BGR",
              "YCrCb2RGB",
  
              "BGR2HSV",
              "RGB2HSV",
  
              "",
              "",
  
              "BGR2Lab",
              "RGB2Lab",
  
              "BayerBG2BGR",
              "BayerGB2BGR",
              "BayerRG2BGR",
              "BayerGR2BGR",
  
              "BGR2Luv",
              "RGB2Luv",
  
              "BGR2HLS",
              "RGB2HLS",
  
              "HSV2BGR",
              "HSV2RGB",
  
              "Lab2BGR",
              "Lab2RGB",
              "Luv2BGR",
              "Luv2RGB",
  
              "HLS2BGR",
              "HLS2RGB",
  
              "BayerBG2BGR_VNG",
              "BayerGB2BGR_VNG",
              "BayerRG2BGR_VNG",
              "BayerGR2BGR_VNG",
  
              "BGR2HSV_FULL",
              "RGB2HSV_FULL",
              "BGR2HLS_FULL",
              "RGB2HLS_FULL",
  
              "HSV2BGR_FULL",
              "HSV2RGB_FULL",
              "HLS2BGR_FULL",
              "HLS2RGB_FULL",
  
              "LBGR2Lab",
              "LRGB2Lab",
              "LBGR2Luv",
              "LRGB2Luv",
  
              "Lab2LBGR",
              "Lab2LRGB",
              "Luv2LBGR",
              "Luv2LRGB",
  
              "BGR2YUV",
              "RGB2YUV",
              "YUV2BGR",
              "YUV2RGB",
  
              "BayerBG2GRAY",
              "BayerGB2GRAY",
              "BayerRG2GRAY",
              "BayerGR2GRAY",
  
              //YUV 4:2:0 formats family
              "YUV2RGB_NV12",
              "YUV2BGR_NV12",
              "YUV2RGB_NV21",
              "YUV2BGR_NV21",
  
              "YUV2RGBA_NV12",
              "YUV2BGRA_NV12",
              "YUV2RGBA_NV21",
              "YUV2BGRA_NV21",
  
              "YUV2RGB_YV12",
              "YUV2BGR_YV12",
              "YUV2RGB_IYUV",
              "YUV2BGR_IYUV",
  
              "YUV2RGBA_YV12",
              "YUV2BGRA_YV12",
              "YUV2RGBA_IYUV",
              "YUV2BGRA_IYUV",
  
              "YUV2GRAY_420",
  
              //YUV 4:2:2 formats family
              "YUV2RGB_UYVY",
              "YUV2BGR_UYVY",
              "YUV2RGB_VYUY",
              "YUV2BGR_VYUY",
  
              "YUV2RGBA_UYVY",
              "YUV2BGRA_UYVY",
              "YUV2RGBA_VYUY",
              "YUV2BGRA_VYUY",
  
              "YUV2RGB_YUY2",
              "YUV2BGR_YUY2",
              "YUV2RGB_YVYU",
              "YUV2BGR_YVYU",
  
              "YUV2RGBA_YUY2",
              "YUV2BGRA_YUY2",
              "YUV2RGBA_YVYU",
              "YUV2BGRA_YVYU",
  
              "YUV2GRAY_UYVY",
              "YUV2GRAY_YUY2",
  
              // alpha premultiplication
              "RGBA2mRGBA",
              "mRGBA2RGBA",
  
              "COLORCVT_MAX"
          };
  
          *os << str[info.code];
      }
  
      static void printOsInfo()
      {
      #if defined _WIN32
      #   if defined _WIN64
              printf("[----------]\n[ GPU INFO ] \tRun on OS Windows x64.\n[----------]\n"), fflush(stdout);
      #   else
              printf("[----------]\n[ GPU INFO ] \tRun on OS Windows x32.\n[----------]\n"), fflush(stdout);
      #   endif
      #elif defined __ANDROID__
      #   if defined _LP64 || defined __LP64__
              printf("[----------]\n[ GPU INFO ] \tRun on OS Android x64.\n[----------]\n"), fflush(stdout);
      #   else
              printf("[----------]\n[ GPU INFO ] \tRun on OS Android x32.\n[----------]\n"), fflush(stdout);
      #   endif
      #elif defined __APPLE__
      #   if defined _LP64 || defined __LP64__
              printf("[----------]\n[ GPU INFO ] \tRun on OS Apple x64.\n[----------]\n"), fflush(stdout);
      #   else
              printf("[----------]\n[ GPU INFO ] \tRun on OS Apple x32.\n[----------]\n"), fflush(stdout);
      #   endif
      #elif defined linux
      #   if defined _LP64 || defined __LP64__
              printf("[----------]\n[ GPU INFO ] \tRun on OS Linux x64.\n[----------]\n"), fflush(stdout);
      #   else
              printf("[----------]\n[ GPU INFO ] \tRun on OS Linux x32.\n[----------]\n"), fflush(stdout);
      #   endif
      #endif
  
      }
  
      void printCudaInfo()
      {
          printOsInfo();
          for (int i = 0; i < cv::cuda::getCudaEnabledDeviceCount(); i++)
              cv::cuda::printCudaDeviceInfo(i);
      }
  
      struct KeypointIdxCompare
      {
          std::vector<cv::KeyPoint>* keypoints;
  
          explicit KeypointIdxCompare(std::vector<cv::KeyPoint>* _keypoints) : keypoints(_keypoints) {}
  
          bool operator ()(size_t i1, size_t i2) const
          {
              cv::KeyPoint kp1 = (*keypoints)[i1];
              cv::KeyPoint kp2 = (*keypoints)[i2];
              if (kp1.pt.x != kp2.pt.x)
                  return kp1.pt.x < kp2.pt.x;
              if (kp1.pt.y != kp2.pt.y)
                  return kp1.pt.y < kp2.pt.y;
              if (kp1.response != kp2.response)
                  return kp1.response < kp2.response;
              return kp1.octave < kp2.octave;
          }
      };
  
      void sortKeyPoints(std::vector<cv::KeyPoint>& keypoints, cv::InputOutputArray _descriptors)
      {
          std::vector<size_t> indexies(keypoints.size());
          for (size_t i = 0; i < indexies.size(); ++i)
              indexies[i] = i;
  
          std::sort(indexies.begin(), indexies.end(), KeypointIdxCompare(&keypoints));
  
          std::vector<cv::KeyPoint> new_keypoints;
          cv::Mat new_descriptors;
  
          new_keypoints.resize(keypoints.size());
  
          cv::Mat descriptors;
          if (_descriptors.needed())
          {
              descriptors = _descriptors.getMat();
              new_descriptors.create(descriptors.size(), descriptors.type());
          }
  
          for (size_t i = 0; i < indexies.size(); ++i)
          {
              size_t new_idx = indexies[i];
              new_keypoints[i] = keypoints[new_idx];
              if (!new_descriptors.empty())
                  descriptors.row((int) new_idx).copyTo(new_descriptors.row((int) i));
          }
  
          keypoints.swap(new_keypoints);
          if (_descriptors.needed())
              new_descriptors.copyTo(_descriptors);
      }
  }
  