!7

static int w = 32, h = 16, ww = 400, hh = 200;
static DirectSurface ds;
static BufferedImage img;
sbool continuous = true;

sclass DirectSurface extends Surface {
  BufferedImage img;
  
  *() {}
  *(BufferedImage *img) {}
  
  public void render(int w, int h, Graphics2D g) {
    g.drawImage(img, 0, 0, null);
  }
  
  public Dimension getPreferredSize() {
    ret new Dimension(img.getWidth(), img.getHeight());
  }
}

p-substance {
  img = newBufferedImage(ww, hh);
  showPackedFrame(ds = new DirectSurface(img));
  
  thread {
    BufferedImage src = null;
    long screenshotTime = 0;
    repeat {
      if (!continuous && (src == null || sysNow() > screenshotTime+1000)) {
        src = screenshot();
        screenshotTime = sysNow();
      }
      
      for (int y = 0; y < hh; y += h)
        for (int x = 0; x < ww; x += w) {
          Dimension ss = screenSize();
          int srcw = ss.width, srch = ss.height;
          int srcX = random(srcw-w), srcY = random(srch-h);
          if (continuous)
            drawImageOnImage(screenshot(srcX, srcY, w, h), img, x, y);
          else
            copyImagePart(src, srcX, srcY, img, x, y, w, h);
          ds.paintImmediately(x, y, w, h);
          sleep(50);
        }
    }
  }
}