Source Code Cross Referenced for DivideByConstDescriptor.java in  » 6.0-JDK-Modules » Java-Advanced-Imaging » javax » media » jai » operator » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » javax.media.jai.operator 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: DivideByConstDescriptor.java,v $
003:         *
004:         * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * Use is subject to license terms.
007:         *
008:         * $Revision: 1.1 $
009:         * $Date: 2005/02/11 04:57:34 $
010:         * $State: Exp $
011:         */
012:        package javax.media.jai.operator;
013:
014:        import java.awt.RenderingHints;
015:        import java.awt.image.RenderedImage;
016:        import java.awt.image.renderable.ParameterBlock;
017:        import java.awt.image.renderable.RenderableImage;
018:        import javax.media.jai.JAI;
019:        import javax.media.jai.OperationDescriptorImpl;
020:        import javax.media.jai.ParameterBlockJAI;
021:        import javax.media.jai.RenderableOp;
022:        import javax.media.jai.RenderedOp;
023:        import javax.media.jai.registry.RenderableRegistryMode;
024:        import javax.media.jai.registry.RenderedRegistryMode;
025:
026:        /**
027:         * An <code>OperationDescriptor</code> describing the
028:         * "DivideByConst" operation.
029:         *
030:         * <p> The DivideByConst operation takes one rendered or renderable
031:         * source image and an array of double constants, and divides every
032:         * pixel of the same band of the source by the constant from the
033:         * corresponding array entry.  If the number of constants supplied is
034:         * less than the number of bands of the destination, then the constant
035:         * from entry 0 is applied to all the bands.  Otherwise, a constant
036:         * from a different entry is applied to each band.
037:         *
038:         * <p> In case of division by 0, if the numerator is 0, then the
039:         * result is set to 0; otherwise, the result is set to the maximum
040:         * value supported by the destination data type.
041:         *
042:         * <p> By default, the destination image bound, data type, and number
043:         * of bands are the same as the source image. If the result of the
044:         * operation underflows/overflows the minimum/maximum value supported
045:         * by the destination data type, then it will be clamped to the
046:         * minimum/maximum value respectively.
047:         *
048:         * <p> The destination pixel values are defined by the pseudocode:
049:         * <pre>
050:         * if (constants.length < dstNumBands) {
051:         *     dst[x][y][b] = srcs[x][y][b]/constants[0];
052:         * } else {
053:         *     dst[x][y][b] = srcs[x][y][b]/constants[b];
054:         * }
055:         * </pre>
056:         *
057:         * <p><table border=1>
058:         * <caption>Resource List</caption>
059:         * <tr><th>Name</th>        <th>Value</th></tr>
060:         * <tr><td>GlobalName</td>  <td>DivideByConst</td></tr>
061:         * <tr><td>LocalName</td>   <td>DivideByConst</td></tr>
062:         * <tr><td>Vendor</td>      <td>com.sun.media.jai</td></tr>
063:         * <tr><td>Description</td> <td>Divides an image by constants.</td></tr>
064:         * <tr><td>DocURL</td>      <td>http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/DivideByConstDescriptor.html</td></tr>
065:         * <tr><td>Version</td>     <td>1.0</td></tr>
066:         * <tr><td>arg0Desc</td>    <td>The constants to be divided by.</td></tr>
067:         * </table></p>
068:         *
069:         * <p><table border=1>
070:         * <caption>Parameter List</caption>
071:         * <tr><th>Name</th>      <th>Class Type</th>
072:         *                        <th>Default Value</th></tr>
073:         * <tr><td>constants</td> <td>double[]</td>
074:         *                        <td>{1.0}</td>
075:         * </table></p>
076:         *
077:         * @see javax.media.jai.OperationDescriptor */
078:        public class DivideByConstDescriptor extends OperationDescriptorImpl {
079:
080:            /**
081:             * The resource strings that provide the general documentation
082:             * and specify the parameter list for this operation.
083:             */
084:            private static final String[][] resources = {
085:                    { "GlobalName", "DivideByConst" },
086:                    { "LocalName", "DivideByConst" },
087:                    { "Vendor", "com.sun.media.jai" },
088:                    { "Description",
089:                            JaiI18N.getString("DivideByConstDescriptor0") },
090:                    {
091:                            "DocURL",
092:                            "http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/DivideByConstDescriptor.html" },
093:                    { "Version", JaiI18N.getString("DescriptorVersion") },
094:                    { "arg0Desc", JaiI18N.getString("DivideByConstDescriptor1") } };
095:
096:            /**
097:             * The parameter class list for this operation.
098:             * The number of constants provided should be either 1, in which case
099:             * this same constant is applied to all the source bands; or the same
100:             * number as the source bands, in which case one contant is applied
101:             * to each band.
102:             */
103:            private static final Class[] paramClasses = { double[].class };
104:
105:            /** The parameter name list for this operation. */
106:            private static final String[] paramNames = { "constants" };
107:
108:            /** The parameter default value list for this operation. */
109:            private static final Object[] paramDefaults = { new double[] { 1.0 } };
110:
111:            /** Constructor. */
112:            public DivideByConstDescriptor() {
113:                super (resources, 1, paramClasses, paramNames, paramDefaults);
114:            }
115:
116:            /** Returns <code>true</code> since renderable operation is supported. */
117:            public boolean isRenderableSupported() {
118:                return true;
119:            }
120:
121:            /**
122:             * Validates the input parameters.
123:             *
124:             * <p> In addition to the standard checks performed by the
125:             * superclass method, this method checks that the length of the
126:             * "constants" array is at least 1.
127:             */
128:            protected boolean validateParameters(ParameterBlock args,
129:                    StringBuffer message) {
130:                if (!super .validateParameters(args, message)) {
131:                    return false;
132:                }
133:
134:                int length = ((double[]) args.getObjectParameter(0)).length;
135:                if (length < 1) {
136:                    message.append(getName() + " "
137:                            + JaiI18N.getString("DivideByConstDescriptor2"));
138:                    return false;
139:                }
140:
141:                return true;
142:            }
143:
144:            /**
145:             * Divides an image by constants.
146:             *
147:             * <p>Creates a <code>ParameterBlockJAI</code> from all
148:             * supplied arguments except <code>hints</code> and invokes
149:             * {@link JAI#create(String,ParameterBlock,RenderingHints)}.
150:             *
151:             * @see JAI
152:             * @see ParameterBlockJAI
153:             * @see RenderedOp
154:             *
155:             * @param source0 <code>RenderedImage</code> source 0.
156:             * @param constants The constants to be divided by.
157:             * May be <code>null</code>.
158:             * @param hints The <code>RenderingHints</code> to use.
159:             * May be <code>null</code>.
160:             * @return The <code>RenderedOp</code> destination.
161:             * @throws IllegalArgumentException if <code>source0</code> is <code>null</code>.
162:             */
163:            public static RenderedOp create(RenderedImage source0,
164:                    double[] constants, RenderingHints hints) {
165:                ParameterBlockJAI pb = new ParameterBlockJAI("DivideByConst",
166:                        RenderedRegistryMode.MODE_NAME);
167:
168:                pb.setSource("source0", source0);
169:
170:                pb.setParameter("constants", constants);
171:
172:                return JAI.create("DivideByConst", pb, hints);
173:            }
174:
175:            /**
176:             * Divides an image by constants.
177:             *
178:             * <p>Creates a <code>ParameterBlockJAI</code> from all
179:             * supplied arguments except <code>hints</code> and invokes
180:             * {@link JAI#createRenderable(String,ParameterBlock,RenderingHints)}.
181:             *
182:             * @see JAI
183:             * @see ParameterBlockJAI
184:             * @see RenderableOp
185:             *
186:             * @param source0 <code>RenderableImage</code> source 0.
187:             * @param constants The constants to be divided by.
188:             * May be <code>null</code>.
189:             * @param hints The <code>RenderingHints</code> to use.
190:             * May be <code>null</code>.
191:             * @return The <code>RenderableOp</code> destination.
192:             * @throws IllegalArgumentException if <code>source0</code> is <code>null</code>.
193:             */
194:            public static RenderableOp createRenderable(
195:                    RenderableImage source0, double[] constants,
196:                    RenderingHints hints) {
197:                ParameterBlockJAI pb = new ParameterBlockJAI("DivideByConst",
198:                        RenderableRegistryMode.MODE_NAME);
199:
200:                pb.setSource("source0", source0);
201:
202:                pb.setParameter("constants", constants);
203:
204:                return JAI.createRenderable("DivideByConst", pb, hints);
205:            }
206:        }
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