Function populateBins

examples/cpu/histogram.cpp:228–244

}

void populateBins(Bitmap& bmp, int *hist_array, const unsigned nbins, float *hist_cols)
{
    for (unsigned y=0; y<bmp.height; ++y) {
        for (unsigned x=0; x<bmp.width; ++x) {
            int offset  = x + y * bmp.width;
            unsigned char noiseVal = bmp.ptr[offset*4];
            unsigned idx = (int)((float)noiseVal/255.f * nbins);
            hist_array[idx]++;
        }
    }

    for (unsigned b=0; b<nbins; ++b) {
        hist_cols[3*b+0] = std::rand()/(float)RAND_MAX;
        hist_cols[3*b+1] = std::rand()/(float)RAND_MAX;
        hist_cols[3*b+2] = std::rand()/(float)RAND_MAX;
    }
}