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sclass IntegralImage {
  int w, h;
  int[] data; // 3 ints per pixel
  
  *(RGBImage img) {
    w = img.w();
    h = img.h();
    data = new int[w*h*3];
    int i = 0;
    for y to h: {
      int sumR = 0, sumG = 0, sumB = 0;
      for x to w: {
        int rgb = img.getInt(x, y);
        sumR += (rgb >> 16) & 0xFF;
        sumG += (rgb >> 8) & 0xFF;
        sumB += rgb & 0xFF;
        data[i] = y > 0 ? sumR + data[i-w*3] : sumR;
        data[i+1] = y > 0 ? sumG + data[i-w*3+1] : sumG;
        data[i+2] = y > 0 ? sumB + data[i-w*3+1] : sumB;
        i += 3;
      }
    }
  }
  
  int get(int x, int y, int channel) {
    ret data[(y*w+x)*3+channel];
  }
}