srecord noeq HashBufferedImage(BufferedImage img) {
  long hash;
  
  long get() {
    var gp = grabbableIntPixels_fastOrSlow(img);
    bool hasAlpha = hasAlpha(img);
    
    var ping = pingSource();
    int[] pixelsIn = gp.data;
    int w = gp.w, h = gp.h;
    int scanlineExtra = gp.scanlineStride-w;
    int iIn = gp.offset, iOut = 0;

    for y to h: {
      for x to w: {
        int packed = pixelsIn[iIn++];
        if (!hasAlpha) packed |= 0xFF000000;
        hash = boostHashCombine64(hash, packed);
      }

      iIn += scanlineExtra;
      ping?!;
    }
    
    ret hash;
  }
}