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	/*
	* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package sun.awt.image;

	import java.awt.Image;
	import java.awt.image.ImageObserver;
	import java.util.Arrays;
	import java.util.List;
	import sun.misc.SoftCache;

	public class MultiResolutionToolkitImage extends ToolkitImage implements MultiResolutionImage {

	Image resolutionVariant;

	public MultiResolutionToolkitImage(Image lowResolutionImage, Image resolutionVariant) {
	super(lowResolutionImage.getSource());
	this.resolutionVariant = resolutionVariant;
	}

	@Override
	public Image getResolutionVariant(int width, int height) {
	return ((width <= getWidth() && height <= getHeight()))
	? this : resolutionVariant;
	}

	public Image getResolutionVariant() {
	return resolutionVariant;
	}

	@Override
	public List<Image> getResolutionVariants() {
	return Arrays.<Image>asList(this, resolutionVariant);
	}

	private static final int BITS_INFO = ImageObserver.SOMEBITS
	\| ImageObserver.FRAMEBITS \| ImageObserver.ALLBITS;

	private static class ObserverCache {

	static final SoftCache INSTANCE = new SoftCache();
	}

	public static ImageObserver getResolutionVariantObserver(
	final Image image, final ImageObserver observer,
	final int imgWidth, final int imgHeight,
	final int rvWidth, final int rvHeight) {
	return getResolutionVariantObserver(image, observer,
	imgWidth, imgHeight, rvWidth, rvHeight, false);
	}

	public static ImageObserver getResolutionVariantObserver(
	final Image image, final ImageObserver observer,
	final int imgWidth, final int imgHeight,
	final int rvWidth, final int rvHeight, boolean concatenateInfo) {

	if (observer == null) {
	return null;
	}

	synchronized (ObserverCache.INSTANCE) {
	ImageObserver o = (ImageObserver) ObserverCache.INSTANCE.get(observer);

	if (o == null) {

	o = (Image resolutionVariant, int flags,
	int x, int y, int width, int height) -> {

	if ((flags & (ImageObserver.WIDTH \| BITS_INFO)) != 0) {
	width = (width + 1) / 2;
	}

	if ((flags & (ImageObserver.HEIGHT \| BITS_INFO)) != 0) {
	height = (height + 1) / 2;
	}

	if ((flags & BITS_INFO) != 0) {
	x /= 2;
	y /= 2;
	}

	if(concatenateInfo){
	flags &= ((ToolkitImage) image).
	getImageRep().check(null);
	}

	return observer.imageUpdate(
	image, flags, x, y, width, height);
	};

	ObserverCache.INSTANCE.put(observer, o);
	}
	return o;
	}
	}
	}

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