src/java.desktop/share/classes/java/awt/image/IndexColorModel.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1995, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1995, 2017, 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

@@ -26,10 +26,12 @@
 package java.awt.image;
 
 import java.awt.Transparency;
 import java.awt.color.ColorSpace;
 import java.math.BigInteger;
+import java.util.Arrays;
+import java.util.Objects;
 
 /**
  * The {@code IndexColorModel} class is a {@code ColorModel}
  * class that works with pixel values consisting of a
  * single sample that is an index into a fixed colormap in the default

@@ -127,10 +129,11 @@
     private int map_size;
     private int pixel_mask;
     private int transparent_index = -1;
     private boolean allgrayopaque;
     private BigInteger validBits;
+    private volatile int hashCode;
 
     private sun.awt.image.BufImgSurfaceData.ICMColorData colorData = null;
 
     private static int[] opaqueBits = {8, 8, 8};
     private static int[] alphaBits = {8, 8, 8, 8};

@@ -1530,6 +1533,103 @@
                          + " transIndex   = "+transparent_index
                          + " has alpha = "+supportsAlpha
                          + " isAlphaPre = "+isAlphaPremultiplied
                          );
     }
+
+    /**
+     * Tests if the specified {@code Object} is an
+     * instance of {@code IndexColorModel}
+     * and if it equals this {@code IndexColorModel}
+     * @param obj the {@code Object} to test for equality
+     * @return {@code true} if the specified {@code Object}
+     * equals this {@code IndexColorModel}; {@code false} otherwise.
+     */
+    @Override
+    public boolean equals(Object obj) {
+
+        if (!(obj instanceof IndexColorModel)) {
+            return false;
+        }
+
+        IndexColorModel cm = (IndexColorModel) obj;
+        if (supportsAlpha != cm.hasAlpha() ||
+            isAlphaPremultiplied != cm.isAlphaPremultiplied() ||
+            pixel_bits != cm.getPixelSize() ||
+            transparency != cm.getTransparency() ||
+            numComponents != cm.getNumComponents() ||
+            (!(colorSpace.equals(cm.colorSpace))) ||
+            transferType != cm.transferType ||
+            map_size != cm.map_size ||
+            transparent_index != cm.transparent_index)
+        {
+            return false;
+        }
+
+        int[] nb = cm.getComponentSize();
+
+        if ((nBits != null) && (nb != null)) {
+            for (int i = 0; i < numComponents; i++) {
+                if (nBits[i] != nb[i]) {
+                    return false;
+                }
+            }
+        } else {
+            return ((nBits == null) && (nb == null));
+        }
+
+        // verify whether we have to check equality of all bits in validBits
+        boolean testValidBits;
+        if (validBits == cm.validBits) {
+            testValidBits = false;
+        } else if (validBits == null || cm.validBits == null) {
+            return false;
+        } else if (validBits.equals(cm.validBits)) {
+            testValidBits = false;
+        } else {
+            testValidBits = true;
+        }
+
+        if (testValidBits) {
+            for (int i = 0; i < map_size; i++) {
+                if (rgb[i] != cm.rgb[i] ||
+                    validBits.testBit(i) != cm.validBits.testBit(i))
+                {
+                    return false;
+                }
+            }
+        } else {
+            for (int i = 0; i < map_size; i++) {
+                if (rgb[i] != cm.rgb[i]) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Returns the hash code for IndexColorModel.
+     *
+     * @return    a hash code for IndexColorModel
+     */
+    @Override
+    public int hashCode() {
+        int result = hashCode;
+        if (result == 0) {
+            result = 7;
+            result = 89 * result + this.pixel_bits;
+            result = 89 * result + Arrays.hashCode(this.nBits);
+            result = 89 * result + this.transparency;
+            result = 89 * result + (this.supportsAlpha ? 1 : 0);
+            result = 89 * result + (this.isAlphaPremultiplied ? 1 : 0);
+            result = 89 * result + this.numComponents;
+            result = 89 * result + Objects.hashCode(this.colorSpace);
+            result = 89 * result + this.transferType;
+            result = 89 * result + Arrays.hashCode(this.rgb);
+            result = 89 * result + this.map_size;
+            result = 89 * result + this.transparent_index;
+            hashCode = result;
+        }
+        return result;
+    }
 }