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public static WritableImage renderScaleAwareSnapshot(Canvas canvas, double renderScale) {
	return renderScaleAwareSnapshot(canvas, renderScale, null, 0.0, 0.0, canvas.getWidth(), canvas.getHeight());
}

public static WritableImage renderScaleAwareCanvasSnapshot(Canvas canvas, double renderScale,
		WritableImage writableImage) {
	return renderScaleAwareSnapshot(canvas, renderScale, writableImage, 0.0, 0.0, canvas.getWidth(),
			canvas.getHeight());
}

public static WritableImage renderScaleAwareSnapshot(Node node, double renderScale, WritableImage writableImage,
		double x, double y, double width, double height) {
	int renderWidth = (int) Math.rint(renderScale * width);
	int renderHeight = (int) Math.rint(renderScale * height);
	if (writableImage == null || (int) Math.rint(writableImage.getWidth()) != renderWidth
			|| (int) Math.rint(writableImage.getHeight()) != renderHeight) {
		writableImage = new WritableImage(renderWidth, renderHeight);
	}
	SnapshotParameters spa = new SnapshotParameters();
	spa.setViewport(new Rectangle2D(x * renderScale, y * renderScale, width, height));
	spa.setTransform(Transform.scale(renderScale, renderScale));
	return node.snapshot(spa, writableImage);
}