Java by API/java.awt.image/MemoryImageSource

new MemoryImageSource(int w, int h, int[] pix, int off, int scan)

import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.MemoryImageSource;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics gg) {
    int h = 150;
    int w = 150;
    
    int pixels[] = new int[w * h];
    int i = 0;
    int r = 0, g=0, b=0;
    
    for (int y = 0; y < h; y++) {
      for (int x = 0; x < h; x++) {
        r = (x ^ y) & 0xff;
        g = (x * 2 ^ y * 2) & 0xff;
        b = (x * 4 ^ y * 4) & 0xff;
        pixels[i++] = (255 << 24) | (r << 16) | (g << 8) | b;
      }
    }
    Image art = createImage(new MemoryImageSource(w, h, pixels, 0, w));
    gg.drawImage(art, 0, 0, this);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}