#include "stdafx.h"
#include "imageprocess.h"

vector<uchar> histogram_bit8(uchar* data, int rows, int cols)
{
    vector<int> hist_sum(static_cast<uint>(cols));
    vector<uchar> hist(static_cast<uint>(cols));
    for (int x = 0; x < cols; ++x)
    {
        for (int y = 0; y < rows; ++y)
        {
            hist_sum[static_cast<uint>(x)] += data[static_cast<uint>(y * cols + x)];
        }
        hist[static_cast<uint>(x)] = static_cast<uchar>(hist_sum[static_cast<uint>(x)] / rows);
    }

    return hist;
}

void histogram_bit32(uchar* data, int rows, int cols, vector<uchar>& r, vector<uchar>& g, vector<uchar>& b)
{
    uint total = static_cast<uint>(rows * cols);
    uchar* buffer_r = new uchar[total];
    uchar* buffer_g = new uchar[total];
    uchar* buffer_b = new uchar[total];

    for (uint i = 0; i < total; ++i)
    {
        buffer_r[i] = data[i * 3 + 0];
        buffer_g[i] = data[i * 3 + 1];
        buffer_b[i] = data[i * 3 + 2];
    }

    r = histogram_bit8(buffer_r, rows, cols);
    g = histogram_bit8(buffer_g, rows, cols);
    b = histogram_bit8(buffer_b, rows, cols);

    delete[] buffer_r;
    delete[] buffer_g;
    delete[] buffer_b;
}