final sclass BWIntegralImage implements MakesBufferedImage, IBWIntegralImage {
  int w, h;
  int[] data; // 1 entry per pixel
  ifdef BWIntegralImage_CountAccesses
    long accesses;
  endifdef
  
  *() {}
  *(File f) { this(loadImage2(f)); }
  
  *(MakesBufferedImage img) { this(toBufferedImage(img)); }
  
  //*(BufferedImage img) { this(BWImage(img)); }
  
  *(BufferedImage image) ctex {
    alloc(image.getWidth(), image.getHeight());
    // Just grab directly into data array
    PixelGrabber pixelGrabber = new PixelGrabber(image, 0, 0, w, h, data, 0, w);
    if (!pixelGrabber.grabPixels())
      fail("Could not grab pixels");
      
    int sum = 0;
    for x to w: {
      int packed = data[x];
      int brightness = packedToBrightness(packed);
      data[x] = (sum += brightness);
    }
    
    ifdef BWIntegralImage_useVectorAPI
      import jdk.incubator.vector.*;
      VectorSpecies<Int> species = IntVector.SPECIES_PREFERRED;
      int upperBound = species.loopBound(w);
    endifdef

    int i = w;
    for (int y = 1; y < h; y++) {
      sum = 0;
      ifdef BWIntegralImage_useVectorAPI
        int x = 0;
        for (; x < upperBound; x += species.length(), i += species.length()) {
          for (int sub = 0; sub < species.length(); sub++) {
            sum += packedToBrightness(data[i+sub]);
            data[i+sub] = sum;
          }
          
          IntVector v = IntVector.fromArray(species, data, i);
          IntVector v_last = IntVector.fromArray(species, data, i-w);
          v = v.add(v_last);
          v.intoArray(data, i);
        }

        for (; x < w; x++, i++) {
          int packed = data[i];
          int brightness = packedToBrightness(packed);
          sum += brightness;
          data[i] = sum + data[i-w];
        }
      endifdef
      
      ifndef BWIntegralImage_useVectorAPI
        for x to w: {
          int packed = data[i];
          int brightness = packedToBrightness(packed);
          sum += brightness;
          data[i] = sum + data[i-w];
          i++;
        }
      endifndef
    } // for y
  }
    
  *(BWImage img) {
    alloc(img.w(), img.h());
    data = new int[w*h];
    int i = 0;
    for y to h: {
      int sum = 0;
      for x to w: {
        sum += img.getByte(x, y) & 0xFF;
        data[i] = y > 0 ? sum + data[i-w] : sum;
        i++;
      }
    }
  }
  
  private void alloc(int w, int h) {
    this.w = w;
    this.h = h;
    if (w*h > 8*1024*1024)
      fail("Image too large (more than 8 MP): " + w + "*" + h);
    data = new int[w*h];
  }
  
  // pixels outside of image are considered black
  int get(int x, int y) {
    ifdef BWIntegralImage_CountAccesses
      ++accesses;
    endifdef
    ret x < 0 || y < 0 || x >= w || y >= h ? 0
      : data[min(y, h-1)*w+min(x, w-1)];
  }
  
  public int getIIValue(int x, int y) { ret get(x, y); }
  
  public double getPixelAverage(int x1, int y1, int x2, int y2) {
    int area = (x2-x1)*(y2-y1);
    ret doubleRatio(bwIntegralImage_sumRect(this, x1, y1, x2, y2), area);
  }
  
  int getPixel(int x, int y) {
    ret bwIntegralImage_sumRect(this, x, y, x+1, y+1);
  }
  
  int getPixel(Pt p) { ret getPixel(p.x, p.y); }
  
  public int getWidth() { ret w; }
  public int getHeight() { ret h; }
  
  // unoptimized
  public BufferedImage getBufferedImage() {
    ret scaleDownUsingIntegralImageBW(this, w).getBufferedImage();
  }
  
  int packedToBrightness(int packed) {
    int b = (packed & 0xFF);
    ifdef BWIntegralImage_brightnessCheat
      ret b;
    endifdef
    ifndef BWIntegralImage_brightnessCheat
      int r = ((packed >> 16) & 0xFF);
      int g = ((packed >> 8) & 0xFF);
      ret (r+g+b+1)/3;
    endifndef
  }
}

Began life as a copy of #1019595