Java java.awt Class Component.BltBufferStrategy（JDK8）

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

• BltBufferStrategy

  protected 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:

  Window.createBufferStrategy(int), Canvas.createBufferStrategy(int), Window.getBufferStrategy(), Canvas.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