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<TITLE>Double-Buffering in Full-Screen Mode
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h3>
e606.
Double-Buffering in Full-Screen Mode</h3>
Page-flipping, if supported, is the fastest way to copy a back buffer
to the screen. This example demonstrates how to implement
double-buffering using page flipping in full-screen mode.
<pre>
// Determine if page flipping is supported
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gd.getDefaultConfiguration();
BufferCapabilities bufCap = gc.getBufferCapabilities();
boolean page = bufCap.isPageFlipping();
if (page) {
// Page flipping is supported
} else {
// Page flipping is not supported
}
// Create a window for full-screen mode
Frame frame = new Frame(gd.getDefaultConfiguration());
Window win = new Window(frame);
// Configure the window so that a mouse click will exit full-screen mode
win.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent evt) {
// Exit full-screen mode
GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice();
gd.setFullScreenWindow(null);
}
});
try {
// Enter full-screen mode
gd.setFullScreenWindow(win);
win.requestFocus();
// Create the back buffer
int numBuffers = 2; // Includes front buffer
win.createBufferStrategy(numBuffers);
// Determine the state of a back buffer after it has been displayed on the screen.
// This information is used to optimize performance. For example, if your application
// needs to initialize a back buffer with a background color, there is
// no need to do so if the flip contents is BACKGROUND.
BufferStrategy strategy = win.getBufferStrategy();
bufCap = strategy.getCapabilities();
BufferCapabilities.FlipContents flipContents = bufCap.getFlipContents();
if (flipContents.equals(BufferCapabilities.FlipContents.UNDEFINED)) {
// The contents is unknown after a flip
} else if (flipContents.equals(BufferCapabilities.FlipContents.BACKGROUND)) {
// The contents cleared to the component's background color after a flip
} else if (flipContents.equals(BufferCapabilities.FlipContents.PRIOR)) {
// The contents is the contents of the front buffer just before the flip
} else if (flipContents.equals(BufferCapabilities.FlipContents.COPIED)) {
// The contents is identical to the contents just pushed to the
// front buffer after a flip
}
// Draw loop
while (true) {
// Get screen size
int screenWidth = win.getWidth();
int screenHeight = win.getHeight();
// Get graphics context for drawing to the window
Graphics g = strategy.getDrawGraphics();
if (!flipContents.equals(BufferCapabilities.FlipContents.BACKGROUND)) {
// Clear background
g.setColor(Color.white);
g.fillRect(0, 0, screenWidth, screenHeight);
}
// Draw shapes and images...
// Done drawing
g.dispose();
// Flip the back buffer to the screen
strategy.show();
}
} catch (Throwable e) {
// Process exception...
} finally {
gd.setFullScreenWindow(null);
}
</pre>
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Related Examples
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</table>
e602. <a class="eglink" href="screen_ScreenSize.html?l=rel">
Getting the Screen Size
</a>
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e603. <a class="eglink" href="screen_CenterScreen.html?l=rel">
Centering a Frame, Window, or Dialog on the Screen
</a>
<br>
e604. <a class="eglink" href="screen_NumScreens.html?l=rel">
Getting the Number of Screens
</a>
<br>
e605. <a class="eglink" href="screen_FullWin.html?l=rel">
Enabling Full-Screen Mode
</a>
<br>
e607. <a class="eglink" href="screen_GetDispModes.html?l=rel">
Getting the Available Screen Sizes, Refresh Rates, and Number of Colors
</a>
<br>
e608. <a class="eglink" href="screen_ScreenBits.html?l=rel">
Getting the Current Screen Refresh Rate and Number of Colors
</a>
<br>
e609. <a class="eglink" href="screen_SetDispMode.html?l=rel">
Setting the Screen Size, Refresh Rate, or Number of Colors
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See also:
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Colors">
Colors
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<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Components">
Components
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<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Containers">
Containers
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Cursors">
Cursors
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Drawing">
Drawing
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Focus">
Focus
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<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Frames">
Frames
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<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#GridBagLayout">
GridBagLayout
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<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Images">
Images
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Shapes">
Shapes
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Simulating%20Events">
Simulating Events
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<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Text">
Text
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