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Java Standard Edition (SE)

Component.BltBufferStrategy


java.awt

Class Component.BltBufferStrategy

  • Enclosing class:
    Component


    protected class Component.BltBufferStrategy
    extends BufferStrategy
    Inner class for blitting offscreen surfaces to a component.
    Since:
    1.4
    • Field Detail

      • 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

      • createBackBuffers

        protected void createBackBuffers(int numBuffers)
        Creates the back buffers
      • 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


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