Caching and preallocating images by ThreadLocal

[eix128]

Hello , i checked your source codes and you always make new BufferedImage per scale.
This is time consuming.You can pre allocate images by ThreadLocal like shown below example :

    final BufferedImage screenCapture = robot.createScreenCapture( new Rectangle( 0 , 0 , 1 , 1));
    imageThreadLocal = new ThreadLocal<BufferedImage>() {
        @Override
        protected BufferedImage initialValue() {
            final RectangleEx rectangle1 = rootRects[0];
            final Rectangle rectangle2 = rectangle1.getRectangle();
            return new BufferedImage(  rectangle2.width , rectangle2.height , screenCapture.getType() );
        }
    };



writer = new ThreadLocal<ImageWriter>() {
        @Override
        protected ImageWriter initialValue() {
            final Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
            if (!writers.hasNext())
                throw new IllegalStateException("No writers found");
            ImageWriter writer2  = (ImageWriter) writers.next();
            return writer2;
        }
    };