MicroBenchmarks/harris/harrisKernel.cpp

#include "harris.h"

// harris kernel from polymage_naive.cpp
void harrisKernel(
    int height, int width, float inputImg[2 + HEIGHT][2 + WIDTH],
    float outputImg[(2 + HEIGHT)][2 + WIDTH], float Ix[(2 + HEIGHT)][2 + WIDTH],
    float Iy[(2 + HEIGHT)][2 + WIDTH], float Ixx[(2 + HEIGHT)][2 + WIDTH],
    float Ixy[(2 + HEIGHT)][2 + WIDTH], float Iyy[(2 + HEIGHT)][2 + WIDTH],
    float Sxx[(2 + HEIGHT)][2 + WIDTH], float Sxy[(2 + HEIGHT)][2 + WIDTH],
    float Syy[(2 + HEIGHT)][2 + WIDTH], float det[(2 + HEIGHT)][2 + WIDTH],
    float trace[(2 + HEIGHT)][2 + WIDTH]) {
  for (int _i0 = 0; (_i0 - height < 0); _i0++) {
    for (int _i1 = 0; (_i1 - width < 0); _i1++) {
      Iy[_i0 + 1][_i1 + 1] =
          (((((((inputImg[_i0][_i1]) * -0.0833333333333f) +
               ((inputImg[_i0][_i1 + 2]) * 0.0833333333333f)) +
              ((inputImg[_i0 + 1][_i1]) * -0.166666666667f)) +
             ((inputImg[_i0 + 1][_i1 + 2]) * 0.166666666667f)) +
            ((inputImg[_i0 + 2][_i1]) * -0.0833333333333f)) +
           ((inputImg[_i0 + 2][_i1 + 2]) * 0.0833333333333f));
    }
  }

  for (int _i0 = 0; (_i0 - height < 0); _i0++) {
    for (int _i1 = 0; (_i1 - width < 0); _i1++) {
      Ix[_i0 + 1][_i1 + 1] =
          ((((((inputImg[_i0][_i1] * -0.0833333333333f) +
               (inputImg[_i0 + 2][_i1] * 0.0833333333333f)) +
              (inputImg[_i0][_i1 + 1] * -0.166666666667f)) +
             (inputImg[_i0 + 2][_i1 + 1] * 0.166666666667f)) +
            (inputImg[_i0][_i1 + 2] * -0.0833333333333f)) +
           (inputImg[_i0 + 2][_i1 + 2] * 0.0833333333333f));
    }
  }

  for (int _i0 = 1; (_i0 - height - 1 < 0); _i0++) {
    for (int _i1 = 1; (_i1 - width - 1 < 0); _i1++) {
      Iyy[_i0][_i1] = Iy[_i0][_i1] * Iy[_i0][_i1];
    }
  }

  for (int _i0 = 1; (_i0 - height - 1 < 0); _i0++) {
    for (int _i1 = 1; (_i1 - width - 1 < 0); _i1++) {
      Ixy[_i0][_i1] = Ix[_i0][_i1] * Iy[_i0][_i1];
    }
  }

  for (int _i0 = 1; (_i0 - height - 1 < 0); _i0++) {
    for (int _i1 = 1; (_i1 - width - 1 < 0); _i1++) {
      Ixx[_i0][_i1] = Ix[_i0][_i1] * Ix[_i0][_i1];
    }
  }

  for (int _i0 = 2; (_i0 < height); _i0++) {
    for (int _i1 = 2; (_i1 < width); _i1++) {
      Syy[_i0][_i1] = ((((((((Iyy[-1 + _i0][-1 + _i1] + Iyy[-1 + _i0][_i1]) +
                             Iyy[-1 + _i0][1 + _i1]) +
                            Iyy[_i0][-1 + _i1]) +
                           Iyy[_i0][_i1]) +
                          Iyy[_i0][1 + _i1]) +
                         Iyy[1 + _i0][-1 + _i1]) +
                        Iyy[1 + _i0][_i1]) +
                       Iyy[1 + _i0][1 + _i1]);
    }
  }

  for (int _i0 = 2; (_i0 < height); _i0++) {
    for (int _i1 = 2; (_i1 < width); _i1++) {
      Sxy[_i0][_i1] = ((((((((Ixy[-1 + _i0][-1 + _i1] + Ixy[-1 + _i0][_i1]) +
                             Ixy[-1 + _i0][1 + _i1]) +
                            Ixy[_i0][-1 + _i1]) +
                           Ixy[_i0][_i1]) +
                          Ixy[_i0][1 + _i1]) +
                         Ixy[1 + _i0][-1 + _i1]) +
                        Ixy[1 + _i0][_i1]) +
                       Ixy[1 + _i0][1 + _i1]);
    }
  }

  for (int _i0 = 2; (_i0 < height); _i0++) {
    for (int _i1 = 2; (_i1 < width); _i1++) {
      Sxx[_i0][_i1] = ((((((((Ixx[-1 + _i0][-1 + _i1] + Ixx[-1 + _i0][_i1]) +
                             Ixx[-1 + _i0][1 + _i1]) +
                            Ixx[_i0][-1 + _i1]) +
                           Ixx[_i0][_i1]) +
                          Ixx[_i0][1 + _i1]) +
                         Ixx[1 + _i0][-1 + _i1]) +
                        Ixx[1 + _i0][_i1]) +
                       Ixx[1 + _i0][1 + _i1]);
    }
  }

  for (int _i0 = 2; (_i0 < height); _i0++) {
    for (int _i1 = 2; (_i1 < width); _i1++) {
      trace[_i0][_i1] = (Sxx[_i0][_i1] + Syy[_i0][_i1]);
    }
  }

  for (int _i0 = 2; (_i0 < height); _i0++) {
    for (int _i1 = 2; (_i1 < width); _i1++) {
      det[_i0][_i1] =
          ((Sxx[_i0][_i1] * Syy[_i0][_i1]) - (Sxy[_i0][_i1] * Sxy[_i0][_i1]));
    }
  }

  for (int _i0 = 2; (_i0 < height); _i0++) {
    for (int _i1 = 2; (_i1 < width); _i1++) {
      outputImg[_i0][_i1] =
          (det[_i0][_i1] - ((0.04f * trace[_i0][_i1]) * trace[_i0][_i1]));
    }
  }
}