question: protected BufferedImage scrubOrGetNewBufferedImage ( BufferedImage currentImage , int width , int height ) { int cWidth = - 1 ; int cHeight = - 1 ; if ( currentImage != null ) { cWidth = currentImage . getWidth ( ) ; cHeight = currentImage . getHeight ( ) ; } if ( currentImage != null && cWidth == width && cHeight == height ) { Graphics2D graphics = ( Graphics2D ) currentImage . getGraphics ( ) ; graphics . setComposite ( AlphaComposite . Clear ) ; graphics . fillRect ( 0 , 0 , width , height ) ; graphics . setComposite ( AlphaComposite . SrcOver ) ; return null ; } return new BufferedImage ( width , height , BufferedImage . TYPE_INT_ARGB ) ; }
target:  Given the current image buffer, and the desired width and height of the new projection, return a fresh/refreshed image buffer ready for layer painting. Should be clear.