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25 package sun.awt.image;
26 
27 import java.awt.Image;
28 import java.awt.image.ImageObserver;
29 import java.awt.image.MultiResolutionImage;
30 import java.util.Arrays;
31 import java.util.List;
32 import java.util.function.Function;
33 import sun.awt.SoftCache;
34 
35 public class MultiResolutionToolkitImage extends ToolkitImage implements MultiResolutionImage {
36 
37     Image resolutionVariant;
38 
MultiResolutionToolkitImage(Image lowResolutionImage, Image resolutionVariant)39     public MultiResolutionToolkitImage(Image lowResolutionImage, Image resolutionVariant) {
40         super(lowResolutionImage.getSource());
41         this.resolutionVariant = resolutionVariant;
42     }
43 
44     @Override
getResolutionVariant(double destWidth, double destHeight)45     public Image getResolutionVariant(double destWidth, double destHeight) {
46         checkSize(destWidth, destHeight);
47         return ((destWidth <= getWidth() && destHeight <= getHeight()))
48                 ? this : resolutionVariant;
49     }
50 
map(MultiResolutionToolkitImage mrImage, Function<Image, Image> mapper)51     public static Image map(MultiResolutionToolkitImage mrImage,
52                             Function<Image, Image> mapper) {
53         Image baseImage = mapper.apply(mrImage);
54         Image rvImage = mapper.apply(mrImage.resolutionVariant);
55         return new MultiResolutionToolkitImage(baseImage, rvImage);
56     }
57 
checkSize(double width, double height)58     private static void checkSize(double width, double height) {
59         if (width <= 0 || height <= 0) {
60             throw new IllegalArgumentException(String.format(
61                     "Width (%s) or height (%s) cannot be <= 0", width, height));
62         }
63 
64         if (!Double.isFinite(width) || !Double.isFinite(height)) {
65             throw new IllegalArgumentException(String.format(
66                     "Width (%s) or height (%s) is not finite", width, height));
67         }
68     }
69 
getResolutionVariant()70     public Image getResolutionVariant() {
71         return resolutionVariant;
72     }
73 
74     @Override
getResolutionVariants()75     public List<Image> getResolutionVariants() {
76         return Arrays.<Image>asList(this, resolutionVariant);
77     }
78 
79     private static final int BITS_INFO = ImageObserver.SOMEBITS
80             | ImageObserver.FRAMEBITS | ImageObserver.ALLBITS;
81 
82     private static class ObserverCache {
83 
84         @SuppressWarnings("deprecation")
85         static final SoftCache INSTANCE = new SoftCache();
86     }
87 
getResolutionVariantObserver( final Image image, final ImageObserver observer, final int imgWidth, final int imgHeight, final int rvWidth, final int rvHeight)88     public static ImageObserver getResolutionVariantObserver(
89             final Image image, final ImageObserver observer,
90             final int imgWidth, final int imgHeight,
91             final int rvWidth, final int rvHeight) {
92         return getResolutionVariantObserver(image, observer,
93                 imgWidth, imgHeight, rvWidth, rvHeight, false);
94     }
95 
getResolutionVariantObserver( final Image image, final ImageObserver observer, final int imgWidth, final int imgHeight, final int rvWidth, final int rvHeight, boolean concatenateInfo)96     public static ImageObserver getResolutionVariantObserver(
97             final Image image, final ImageObserver observer,
98             final int imgWidth, final int imgHeight,
99             final int rvWidth, final int rvHeight, boolean concatenateInfo) {
100 
101         if (observer == null) {
102             return null;
103         }
104 
105         synchronized (ObserverCache.INSTANCE) {
106             ImageObserver o = (ImageObserver) ObserverCache.INSTANCE.get(observer);
107 
108             if (o == null) {
109 
110                 o = (Image resolutionVariant, int flags,
111                         int x, int y, int width, int height) -> {
112 
113                             if ((flags & (ImageObserver.WIDTH | BITS_INFO)) != 0) {
114                                 width = (width + 1) / 2;
115                             }
116 
117                             if ((flags & (ImageObserver.HEIGHT | BITS_INFO)) != 0) {
118                                 height = (height + 1) / 2;
119                             }
120 
121                             if ((flags & BITS_INFO) != 0) {
122                                 x /= 2;
123                                 y /= 2;
124                             }
125 
126                             if(concatenateInfo){
127                                 flags &= ((ToolkitImage) image).
128                                         getImageRep().check(null);
129                             }
130 
131                             return observer.imageUpdate(
132                                     image, flags, x, y, width, height);
133                         };
134 
135                 ObserverCache.INSTANCE.put(observer, o);
136             }
137             return o;
138         }
139     }
140 }
141