Component.BltBufferStrategy

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java.awt
Class Component.BltBufferStrategy

java.lang.Object
  java.awt.image.BufferStrategy
      java.awt.Component.BltBufferStrategy

Direct Known Subclasses:: Canvas.CanvasBltBufferStrategy, Window.WindowBltBufferStrategy

Enclosing class:: Component

protected class Component.BltBufferStrategy
extends java.awt.image.BufferStrategy

This class provides support for blitting offscreen surfaces to a component.

Since:: 1.4

Field Summary

protected java.awt.image.VolatileImage[] backBuffers
          The back buffers used in this strategy.

protected BufferCapabilities caps
          The capabilities of the image buffer.

private java.awt.image.VolatileImage frontBuffer
          The front buffer.

protected int height
          The height of the back buffers.

protected boolean validatedContents
          Whether or not the image buffer resources are allocated and ready to be drawn into.

protected int width
          The width of the back buffers.

Constructor Summary

protected Component.BltBufferStrategy(int numBuffers, BufferCapabilities caps)
          Creates a blitting buffer strategy.

Method Summary

boolean contentsLost()
          Returns whether or not the image buffer resources have been lost.

boolean contentsRestored()
          Returns whether or not the image buffer resources have been restored.

protected void createBackBuffers(int numBuffers)
          Initializes the backBuffers field with an array of numBuffers VolatileImages.

BufferCapabilities getCapabilities()
          Retrieves the capabilities of this buffer strategy.

Graphics getDrawGraphics()
          Retrieves a graphics object that can be used to draw into this strategy's image buffer.

protected void revalidate()
          Re-create the image buffer resources if they've been lost.

void show()
          Bring the contents of the back buffer to the front buffer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

caps

protected BufferCapabilities caps

The capabilities of the image buffer.

backBuffers

protected java.awt.image.VolatileImage[] backBuffers

The back buffers used in this strategy.

validatedContents

protected boolean validatedContents

Whether or not the image buffer resources are allocated and ready to be drawn into.

width

protected int width

The width of the back buffers.

height

protected int height

The height of the back buffers.

frontBuffer

private java.awt.image.VolatileImage frontBuffer

The front buffer.

Constructor Detail