Class Component.BltBufferStrategy
java.lang.Object
java.awt.image.BufferStrategy
java.awt.Component.BltBufferStrategy
- Enclosing class:
- Component
Inner class for blitting offscreen surfaces to a component.
- Since:
- 1.4
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Field SummaryFieldsModifier and TypeFieldDescriptionprotected VolatileImage[]The back buffersprotected BufferCapabilitiesThe buffering capabilitiesprotected intHeight of the back buffersprotected booleanWhether or not the drawing buffer has been recently restored from a lost state.protected intWidth of the back buffers
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Constructor SummaryConstructorsModifierConstructorDescriptionprotectedBltBufferStrategy(int numBuffers, BufferCapabilities caps) Creates a new blt buffer strategy around a component
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Method SummaryModifier and TypeMethodDescriptionbooleanReturns whether the drawing buffer was lost since the last call togetDrawGraphics.booleanReturns whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white).protected voidcreateBackBuffers(int numBuffers) Creates the back buffersvoiddispose()Releases system resources currently consumed by thisBufferStrategyand removes it from the associated Component.Returns theBufferCapabilitiesfor thisBufferStrategy.Creates a graphics context for the drawing buffer.protected voidRestore the drawing buffer if it has been lostvoidshow()Makes the next available buffer visible.
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Field Details- 
capsThe buffering capabilities
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backBuffersThe back buffers
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validatedContentsprotected boolean validatedContentsWhether or not the drawing buffer has been recently restored from a lost state.
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widthprotected int widthWidth of the back buffers
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heightprotected int heightHeight of the back buffers
 
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Constructor Details- 
BltBufferStrategyCreates 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
 
 
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Method Details- 
disposepublic void dispose()Releases system resources currently consumed by thisBufferStrategyand removes it from the associated Component. After invoking this method,getBufferStrategywill return null. Trying to use aBufferStrategyafter it has been disposed will result in undefined behavior.- Overrides:
- disposein class- BufferStrategy
- Since:
- 1.6
- See Also:
 
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createBackBuffersprotected void createBackBuffers(int numBuffers) Creates the back buffers- Parameters:
- numBuffers- the number of buffers to create
 
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getCapabilitiesDescription copied from class:BufferStrategyReturns theBufferCapabilitiesfor thisBufferStrategy.- Specified by:
- getCapabilitiesin class- BufferStrategy
- Returns:
- the buffering capabilities of this strategy
 
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getDrawGraphicsDescription copied from class:BufferStrategyCreates 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:
- getDrawGraphicsin class- BufferStrategy
- Returns:
- the draw graphics
 
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showpublic void show()Makes the next available buffer visible.- Specified by:
- showin class- BufferStrategy
 
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revalidateprotected void revalidate()Restore the drawing buffer if it has been lost
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contentsLostpublic boolean contentsLost()Description copied from class:BufferStrategyReturns whether the drawing buffer was lost since the last call togetDrawGraphics. Since the buffers in a buffer strategy are usually typeVolatileImage, they may become lost. For a discussion on lost buffers, seeVolatileImage.- Specified by:
- contentsLostin class- BufferStrategy
- Returns:
- whether the drawing buffer was lost since the last call to
 getDrawGraphics
- See Also:
 
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contentsRestoredpublic boolean contentsRestored()Description copied from class:BufferStrategyReturns 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 typeVolatileImage, they may become lost. If a surface has been recently restored from a lost state since the last call togetDrawGraphics, it may require repainting. For a discussion on lost buffers, seeVolatileImage.- Specified by:
- contentsRestoredin class- BufferStrategy
- Returns:
- whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white)
- See Also:
 
 
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