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+/*
+ * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package demos.j2d;
+
+import java.awt.AlphaComposite;
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.Frame;
+import java.awt.Graphics2D;
+import java.awt.Rectangle;
+import java.awt.event.*;
+import java.awt.font.*;
+import java.text.*;
+
+import javax.media.opengl.*;
+import com.sun.opengl.util.*;
+import com.sun.opengl.util.j2d.*;
+
+import demos.gears.Gears;
+import demos.util.*;
+import gleem.linalg.*;
+
+/** A simple test of the Overlay utility class. Draws gears underneath
+    with moving Java 2D-rendered text on top. */
+
+public class TestOverlay implements GLEventListener {
+  public static void main(String[] args) {
+    Frame frame = new Frame("Java 2D Overlay Test");
+    GLCapabilities caps = new GLCapabilities();
+    caps.setAlphaBits(8);
+    GLCanvas canvas = new GLCanvas(caps);
+    canvas.addGLEventListener(new Gears());
+    canvas.addGLEventListener(new TestOverlay());
+    frame.add(canvas);
+    frame.setSize(512, 512);
+    final Animator animator = new Animator(canvas);
+    frame.addWindowListener(new WindowAdapter() {
+        public void windowClosing(WindowEvent e) {
+          // Run this on another thread than the AWT event queue to
+          // make sure the call to Animator.stop() completes before
+          // exiting
+          new Thread(new Runnable() {
+              public void run() {
+                animator.stop();
+                System.exit(0);
+              }
+            }).start();
+        }
+      });
+    frame.show();
+    animator.start();
+  }
+
+  private Overlay overlay;
+  private Time time;
+  private Font font;
+  private Color TRANSPARENT_BLACK = new Color(0.0f, 0.0f, 0.0f, 0.0f);
+  private FontRenderContext frc;
+  private GlyphVector gv;
+  private Vec2f velocity = new Vec2f(100.0f, 150.0f);
+  private Vec2f position;
+  private Rectangle textBounds;
+  private Rectangle lastTextBounds;
+  private String TEST_STRING = "Java 2D Text";
+  private long startTime;
+  private int frameCount;
+  private DecimalFormat format = new DecimalFormat("####.00");
+
+  public void init(GLAutoDrawable drawable) {
+    GL gl = drawable.getGL();
+    gl.setSwapInterval(0);
+
+    overlay = new Overlay(drawable);
+    time = new SystemTime();
+    ((SystemTime) time).rebase();
+
+    // Start the text half way up the left side
+    position = new Vec2f(0.0f, drawable.getHeight() / 2);
+
+    // Create the font, render context, and glyph vector
+    font = new Font("SansSerif", Font.BOLD, 36);
+  }
+
+  public void display(GLAutoDrawable drawable) {
+    if (startTime == 0) {
+      startTime = System.currentTimeMillis();
+    }
+
+    Graphics2D g2d = overlay.createGraphics();
+
+    if (++frameCount == 30) {
+      long endTime = System.currentTimeMillis();
+      float fps = 30.0f / (float) (endTime - startTime) * 1000;
+      frameCount = 0;
+      startTime = System.currentTimeMillis();
+
+      FontRenderContext frc = g2d.getFontRenderContext();
+      String fpsString = "FPS: " + format.format(fps);
+      GlyphVector gv = font.createGlyphVector(frc, TEST_STRING);
+      int x = drawable.getWidth() - 200;
+      int y = drawable.getHeight() - 20;
+      Rectangle fpsBounds = gv.getPixelBounds(frc, x, y);
+      g2d.setFont(font);
+      g2d.setComposite(AlphaComposite.Src);
+      g2d.setColor(TRANSPARENT_BLACK);
+      g2d.fillRect(fpsBounds.x, fpsBounds.y, fpsBounds.width, fpsBounds.height);
+      g2d.setColor(Color.WHITE);
+      g2d.drawString(fpsString, x, y);
+      overlay.sync(fpsBounds.x, fpsBounds.y, fpsBounds.width, fpsBounds.height);
+    }
+
+    time.update();
+
+    // Move down the text bounds
+    lastTextBounds = textBounds;
+
+    g2d.setFont(font);
+    g2d.setComposite(AlphaComposite.Src);
+    if (overlay.contentsLost()) {
+      frc = g2d.getFontRenderContext();
+      gv = font.createGlyphVector(frc, TEST_STRING);
+    }
+
+    // Compute the next position of the text
+    position = position.plus(velocity.times((float) time.deltaT()));
+    // Figure out whether we have to switch directions
+    textBounds = gv.getPixelBounds(frc, position.x(), position.y());
+    if (textBounds.getMinX() < 0) {
+      velocity.setX(Math.abs(velocity.x()));
+    } else if (textBounds.getMaxX() > drawable.getWidth()) {
+      velocity.setX(-1.0f * Math.abs(velocity.x()));
+    }
+    if (textBounds.getMinY() < 0) {
+      velocity.setY(Math.abs(velocity.y()));
+    } else if (textBounds.getMaxY() > drawable.getHeight()) {
+      velocity.setY(-1.0f * Math.abs(velocity.y()));
+    }
+
+    // Clear the last text (if any) and draw the current
+    if (lastTextBounds != null) {
+      g2d.setColor(TRANSPARENT_BLACK);
+      g2d.fillRect((int) lastTextBounds.getMinX(), (int) lastTextBounds.getMinY(),
+                   (int) (lastTextBounds.getWidth() + 1), (int) (lastTextBounds.getHeight() + 1));
+    } else if (overlay.contentsLost()) {
+      g2d.setColor(TRANSPARENT_BLACK);
+      g2d.fillRect(0, 0, drawable.getWidth(), drawable.getHeight());
+    }
+    g2d.setColor(Color.WHITE);
+    g2d.drawString(TEST_STRING, position.x(), position.y());
+
+    // Compute the union of these rectangles to push an update to
+    // the overlay
+    Rectangle union = new Rectangle(textBounds);
+    if (lastTextBounds != null) {
+      union.add(lastTextBounds);
+    }
+    overlay.sync(union.x, union.y, union.width, union.height);
+
+    // Draw the overlay
+    overlay.drawAll();
+    g2d.dispose();
+  }
+
+  // Unused methods
+  public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {}
+  public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
+}