1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package sun.awt.image; 26 27 import java.awt.Graphics; 28 import java.awt.Image; 29 import java.awt.image.*; 30 31 /** 32 * This class provides default implementations for the 33 * <code>MultiResolutionImage</code> interface. The developer needs only 34 * to subclass this abstract class and define the <code>getResolutionVariant</code>, 35 * <code>getResolutionVariants</code>, and <code>getBaseImage</code> methods. 36 * 37 * 38 * For example, 39 * {@code 40 * public class CustomMultiResolutionImage extends AbstractMultiResolutionImage { 41 * 42 * int baseImageIndex; 43 * Image[] resolutionVariants; 44 * 45 * public CustomMultiResolutionImage(int baseImageIndex, 46 * Image... resolutionVariants) { 47 * this.baseImageIndex = baseImageIndex; 48 * this.resolutionVariants = resolutionVariants; 49 * } 50 * 51 * @Override 52 * public Image getResolutionVariant(float logicalDPIX, float logicalDPIY, 53 * float baseImageWidth, float baseImageHeight, 54 * float destImageWidth, float destImageHeight) { 55 * // return a resolution variant based on the given logical DPI, 56 * // base image size, or destination image size 57 * } 58 * 59 * @Override 60 * public List<Image> getResolutionVariants() { 61 * return Arrays.asList(resolutionVariants); 62 * } 63 * 64 * protected Image getBaseImage() { 65 * return resolutionVariants[baseImageIndex]; 66 * } 67 * } 68 * } 69 * 70 * @see java.awt.Image 71 * @see java.awt.image.MultiResolutionImage 72 * 73 * @since 1.9 74 */ 75 public abstract class AbstractMultiResolutionImage extends java.awt.Image 76 implements MultiResolutionImage { 77 78 /** 79 * @inheritDoc 80 */ 81 @Override 82 public int getWidth(ImageObserver observer) { 83 return getBaseImage().getWidth(null); 84 } 85 86 /** 87 * @inheritDoc 88 */ 89 @Override 90 public int getHeight(ImageObserver observer) { 91 return getBaseImage().getHeight(null); 92 } 93 94 /** 95 * @inheritDoc 96 */ 97 @Override 98 public ImageProducer getSource() { 99 return getBaseImage().getSource(); 100 } 101 102 /** 103 * @inheritDoc 104 */ 105 @Override 106 public Graphics getGraphics() { 107 return getBaseImage().getGraphics(); 108 109 } 110 111 /** 112 * @inheritDoc 113 */ 114 @Override 115 public Object getProperty(String name, ImageObserver observer) { 116 return getBaseImage().getProperty(name, observer); 117 } 118 119 /** 120 * @return base image 121 */ 122 protected abstract Image getBaseImage(); 123 }