1 /*
   2  * Copyright (c) 2003, 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 
  26 package com.sun.imageio.plugins.common;
  27 
  28 import java.awt.color.ColorSpace;
  29 
  30 /**
  31  * A dummy <code>ColorSpace</code> to enable <code>ColorModel</code>
  32  * for image data which do not have an innate color representation.
  33  */
  34 @SuppressWarnings("serial") // JDK-implementation class
  35 public class BogusColorSpace extends ColorSpace {
  36     /**
  37      * Return the type given the number of components.
  38      *
  39      * @param numComponents The number of components in the
  40      * <code>ColorSpace</code>.
  41      * @exception IllegalArgumentException if <code>numComponents</code>
  42      * is less than 1.
  43      */
  44     private static int getType(int numComponents) {
  45         if(numComponents < 1) {
  46             throw new IllegalArgumentException("numComponents < 1!");
  47         }
  48 
  49         int type;
  50         switch(numComponents) {
  51         case 1:
  52             type = ColorSpace.TYPE_GRAY;
  53             break;
  54         default:
  55             // Based on the constant definitions TYPE_2CLR=12 through
  56             // TYPE_FCLR=25. This will return unknown types for
  57             // numComponents > 15.
  58             type = numComponents + 10;
  59         }
  60 
  61         return type;
  62     }
  63 
  64     /**
  65      * Constructs a bogus <code>ColorSpace</code>.
  66      *
  67      * @param numComponents The number of components in the
  68      * <code>ColorSpace</code>.
  69      * @exception IllegalArgumentException if <code>numComponents</code>
  70      * is less than 1.
  71      */
  72     public BogusColorSpace(int numComponents) {
  73         super(getType(numComponents), numComponents);
  74     }
  75 
  76     //
  77     // The following methods simply copy the input array to the
  78     // output array while otherwise attempting to adhere to the
  79     // specified behavior of the methods vis-a-vis exceptions.
  80     //
  81 
  82     public float[] toRGB(float[] colorvalue) {
  83         if(colorvalue.length < getNumComponents()) {
  84             throw new ArrayIndexOutOfBoundsException
  85                 ("colorvalue.length < getNumComponents()");
  86         }
  87 
  88         float[] rgbvalue = new float[3];
  89 
  90         System.arraycopy(colorvalue, 0, rgbvalue, 0,
  91                          Math.min(3, getNumComponents()));
  92 
  93         return colorvalue;
  94     }
  95 
  96     public float[] fromRGB(float[] rgbvalue) {
  97         if(rgbvalue.length < 3) {
  98             throw new ArrayIndexOutOfBoundsException
  99                 ("rgbvalue.length < 3");
 100         }
 101 
 102         float[] colorvalue = new float[getNumComponents()];
 103 
 104         System.arraycopy(rgbvalue, 0, colorvalue, 0,
 105                          Math.min(3, colorvalue.length));
 106 
 107         return rgbvalue;
 108     }
 109 
 110     public float[] toCIEXYZ(float[] colorvalue) {
 111         if(colorvalue.length < getNumComponents()) {
 112             throw new ArrayIndexOutOfBoundsException
 113                 ("colorvalue.length < getNumComponents()");
 114         }
 115 
 116         float[] xyzvalue = new float[3];
 117 
 118         System.arraycopy(colorvalue, 0, xyzvalue, 0,
 119                          Math.min(3, getNumComponents()));
 120 
 121         return colorvalue;
 122     }
 123 
 124     public float[] fromCIEXYZ(float[] xyzvalue) {
 125         if(xyzvalue.length < 3) {
 126             throw new ArrayIndexOutOfBoundsException
 127                 ("xyzvalue.length < 3");
 128         }
 129 
 130         float[] colorvalue = new float[getNumComponents()];
 131 
 132         System.arraycopy(xyzvalue, 0, colorvalue, 0,
 133                          Math.min(3, colorvalue.length));
 134 
 135         return xyzvalue;
 136     }
 137 }