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  23 
  24 /* @test
  25    @bug 6683775 6794764
  26    @summary Painting artifacts is seen when panel is made setOpaque(false) for a translucent window
  27    @author Alexander Potochkin
  28    @modules java.desktop/com.sun.awt
  29             java.desktop/sun.awt
  30    @run main bug6683775
  31 */
  32 
  33 import com.sun.awt.AWTUtilities;
  34 import sun.awt.SunToolkit;
  35 
  36 import javax.swing.*;
  37 import java.awt.*;
  38 import java.awt.image.BufferedImage;
  39 
  40 public class bug6683775 {
  41     public static void main(String[] args) throws Exception {
  42         GraphicsConfiguration gc = getGC();
  43        if (!AWTUtilities.isTranslucencySupported(
  44                AWTUtilities.Translucency.PERPIXEL_TRANSLUCENT)
  45                 || gc == null) {
  46             return;
  47         }
  48         SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
  49         Robot robot = new Robot();
  50         final JFrame testFrame = new JFrame(gc);
  51 
  52         SwingUtilities.invokeLater(new Runnable() {
  53             public void run() {
  54                 JFrame backgroundFrame = new JFrame("Background frame");
  55                 backgroundFrame.setUndecorated(true);
  56                 JPanel panel = new JPanel();
  57                 panel.setBackground(Color.RED);
  58                 backgroundFrame.add(panel);
  59                 backgroundFrame.setSize(200, 200);
  60                 backgroundFrame.setVisible(true);
  61 
  62                 testFrame.setUndecorated(true);
  63                 JPanel p = new JPanel();
  64                 p.setOpaque(false);
  65                 testFrame.add(p);
  66                 AWTUtilities.setWindowOpaque(testFrame, false);
  67                 testFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  68                 testFrame.setSize(400, 400);
  69                 testFrame.setLocation(0, 0);
  70                 testFrame.setVisible(true);
  71             }
  72         });
  73 
  74         toolkit.realSync();
  75 
  76         //robot.getPixelColor() didn't work right for some reason
  77         BufferedImage capture = robot.createScreenCapture(new Rectangle(100, 100));
  78 
  79         int redRGB = Color.RED.getRGB();
  80         if (redRGB != capture.getRGB(10, 10)) {
  81             throw new RuntimeException("Transparent frame is not transparent!");
  82         }
  83     }
  84 
  85     private static GraphicsConfiguration getGC() {
  86         GraphicsConfiguration transparencyCapableGC =
  87                 GraphicsEnvironment.getLocalGraphicsEnvironment()
  88                         .getDefaultScreenDevice().getDefaultConfiguration();
  89         if (!AWTUtilities.isTranslucencyCapable(transparencyCapableGC)) {
  90             transparencyCapableGC = null;
  91 
  92             GraphicsEnvironment env =
  93                     GraphicsEnvironment.getLocalGraphicsEnvironment();
  94             GraphicsDevice[] devices = env.getScreenDevices();
  95 
  96             for (int i = 0; i < devices.length && transparencyCapableGC == null; i++) {
  97                 GraphicsConfiguration[] configs = devices[i].getConfigurations();
  98                 for (int j = 0; j < configs.length && transparencyCapableGC == null; j++) {
  99                     if (AWTUtilities.isTranslucencyCapable(configs[j])) {
 100                         transparencyCapableGC = configs[j];
 101                     }
 102                 }
 103             }
 104         }
 105         return transparencyCapableGC;
 106     }
 107 }