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java.awt
Class Component.BltBufferStrategy


java.lang.Object
  extended by java.awt.image.BufferStrategy
      extended by java.awt.Component.BltBufferStrategy
Enclosing class:
Component 
protected class Component.BltBufferStrategy
extends BufferStrategy

Inner class for blitting offscreen surfaces to a component.

Since:
1.4

Field Summary
protected   VolatileImage [] backBuffers
          The back buffers
protected   BufferCapabilities caps
          The buffering capabilities
protected  int height
           
protected  boolean validatedContents
          Whether or not the drawing buffer has been recently restored from a lost state.
protected  int width
          Size of the back buffers
 
Constructor Summary
protected Component.BltBufferStrategy (int numBuffers, BufferCapabilities  caps)
          Creates a new blt buffer strategy around a component
 
Method Summary
 boolean contentsLost ()
          Returns whether the drawing buffer was lost since the last call to getDrawGraphics.
 boolean contentsRestored ()
          Returns whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white).
protected  void createBackBuffers (int numBuffers)
          Creates the back buffers
 void dispose ()
          Releases system resources currently consumed by this BufferStrategy and removes it from the associated Component.
  BufferCapabilities getCapabilities ()
          Returns the BufferCapabilities for this BufferStrategy.
  Graphics getDrawGraphics ()
          Creates a graphics context for the drawing buffer.
protected  void revalidate ()
          Restore the drawing buffer if it has been lost
 void show ()
          Makes the next available buffer visible.
 
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 buffering capabilities

backBuffers


protected VolatileImage[] backBuffers
The back buffers

validatedContents


protected boolean validatedContents
Whether or not the drawing buffer has been recently restored from a lost state.

width


protected int width
Size of the back buffers

height


protected int height
Constructor Detail

Component.BltBufferStrategy


protected Component.BltBufferStrategy(int numBuffers,
                                      BufferCapabilities caps)
Creates a new blt buffer strategy around a component

Parameters:
numBuffers - number of buffers to create, including the front buffer
caps - the capabilities of the buffers
Method Detail

dispose


public void dispose()
Releases system resources currently consumed by this BufferStrategy and removes it from the associated Component. After invoking this method, getBufferStrategy will return null. Trying to use a BufferStrategy after it has been disposed will result in undefined behavior.

Overrides:
dispose in class BufferStrategy
Since:
1.6
See Also:
Component.createBufferStrategy(int) , Component.getBufferStrategy() Component#createBufferStrategy, Component#getBufferStrategy

createBackBuffers


protected void createBackBuffers(int numBuffers)
Creates the back buffers

getCapabilities


public BufferCapabilities getCapabilities()
Description copied from class: BufferStrategy
Returns the BufferCapabilities for this BufferStrategy.

Specified by:
getCapabilities in class BufferStrategy
Returns:
the buffering capabilities of this strategy

getDrawGraphics


public Graphics getDrawGraphics()
Description copied from class: BufferStrategy
Creates a graphics context for the drawing buffer. This method may not be synchronized for performance reasons; use of this method by multiple threads should be handled at the application level. Disposal of the graphics object obtained must be handled by the application.

Specified by:
getDrawGraphics in class BufferStrategy
Returns:
the draw graphics

show


public void show()
Makes the next available buffer visible.

Specified by:
show in class BufferStrategy

revalidate


protected void revalidate()
Restore the drawing buffer if it has been lost

contentsLost


public boolean contentsLost()
Description copied from class: BufferStrategy
Returns whether the drawing buffer was lost since the last call to getDrawGraphics. Since the buffers in a buffer strategy are usually type VolatileImage, they may become lost. For a discussion on lost buffers, see VolatileImage.

Specified by:
contentsLost in class BufferStrategy
Returns:
whether the drawing buffer was lost since the last call to getDrawGraphics
See Also:
VolatileImage

contentsRestored


public boolean contentsRestored()
Description copied from class: BufferStrategy
Returns whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white). Since the buffers in a buffer strategy are usually type VolatileImage, they may become lost. If a surface has been recently restored from a lost state since the last call to getDrawGraphics, it may require repainting. For a discussion on lost buffers, see VolatileImage.

Specified by:
contentsRestored in class BufferStrategy
Returns:
whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white)
See Also:
VolatileImage