FlipShader.java 文件源码

@Override
public BufferedImage run(final @NonNull BufferedImage image) {
    if (isFlippedHorizontally || isFlippedVertically) {
        final double scaleX = isFlippedHorizontally ? -1 : 1;
        final double scaleY = isFlippedVertically ? -1 : 1;
        final double translateX = isFlippedHorizontally ? -image.getWidth() : 0;
        final double translateY = isFlippedVertically ? -image.getHeight() : 0;

        final AffineTransform tx = AffineTransform.getScaleInstance(scaleX, scaleY);
        tx.translate(translateX, translateY);

        final BufferedImageOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
        return op.filter(image, null);
    }

    return image;
}