Source Code Cross Referenced for OverlayDescriptor.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: OverlayDescriptor.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 04:57:42 $
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.SampleModel;
017:        import java.awt.image.renderable.ParameterBlock;
018:        import java.awt.image.renderable.RenderableImage;
019:        import javax.media.jai.JAI;
020:        import javax.media.jai.OperationDescriptorImpl;
021:        import javax.media.jai.ParameterBlockJAI;
022:        import javax.media.jai.RenderableOp;
023:        import javax.media.jai.RenderedOp;
024:        import javax.media.jai.registry.RenderableRegistryMode;
025:        import javax.media.jai.registry.RenderedRegistryMode;
026:
027:        /**
028:         * An <code>OperationDescriptor</code> describing the "Overlay" operation.
029:         *
030:         * <p> The Overlay operation takes two rendered or renderable source
031:         * images, and overlays the second source image on top of the first
032:         * source image. No additional parameters are required.
033:         *
034:         * <p> The two source images must have the same data type and number
035:         * of bands.  However, their <code>SampleModel</code> types may
036:         * differ. The destination image will always have the same bounding
037:         * rectangle as the first source image, that is, the image on the
038:         * bottom, and the same data type and number of bands as the two
039:         * sources.  In case the two sources don't intersect, the destination
040:         * will be the same as the first source.
041:         *
042:         * <p> The destination pixel values are defined by the pseudocode:
043:         * <pre>
044:         * if (srcs[1] contains the point (x, y)) {
045:         *     dst[x][y][b] = srcs[1][x][y][b];
046:         * } else {
047:         *     dst[x][y][b] = srcs[0][x][y][b];
048:         * }
049:         * </pre>
050:         *
051:         * <p><table border=1>
052:         * <caption>Resource List</caption>
053:         * <tr><th>Name</th>        <th>Value</th></tr>
054:         * <tr><td>GlobalName</td>  <td>Overlay</td></tr>
055:         * <tr><td>LocalName</td>   <td>Overlay</td></tr>
056:         * <tr><td>Vendor</td>      <td>com.sun.media.jai</td></tr>
057:         * <tr><td>Description</td> <td>Overlays one image on top of
058:         *                              another.</td></tr>
059:         * <tr><td>DocURL</td>      <td>http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/OverlayDescriptor.html</td></tr>
060:         * <tr><td>Version</td>     <td>1.0</td></tr>
061:         * </table></p>
062:         *
063:         * <p> No parameters are needed for this operation.
064:         *
065:         * @see javax.media.jai.OperationDescriptor */
066:        public class OverlayDescriptor extends OperationDescriptorImpl {
067:
068:            /**
069:             * The resource strings that provide the general documentation
070:             * and specify the parameter list for this operation.
071:             */
072:            private static final String[][] resources = {
073:                    { "GlobalName", "Overlay" },
074:                    { "LocalName", "Overlay" },
075:                    { "Vendor", "com.sun.media.jai" },
076:                    { "Description", JaiI18N.getString("OverlayDescriptor0") },
077:                    {
078:                            "DocURL",
079:                            "http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/OverlayDescriptor.html" },
080:                    { "Version", JaiI18N.getString("DescriptorVersion") } };
081:
082:            private static final String[] supportedModes = { "rendered",
083:                    "renderable" };
084:
085:            /** Constructor. */
086:            public OverlayDescriptor() {
087:                super (resources, supportedModes, 2, null, null, null, null);
088:            }
089:
090:            /**
091:             * Validates the input sources.
092:             *
093:             * <p> In addition to the standard checks performed by the
094:             * superclass method, this method checks that the source image
095:             * <code>SampleModel</code>s have the same number of bands and
096:             * transfer types.
097:             */
098:            protected boolean validateSources(String modeName,
099:                    ParameterBlock args, StringBuffer msg) {
100:                if (!super .validateSources(modeName, args, msg)) {
101:                    return false;
102:                }
103:
104:                if (!modeName.equalsIgnoreCase("rendered"))
105:                    return true;
106:
107:                RenderedImage src1 = args.getRenderedSource(0);
108:                RenderedImage src2 = args.getRenderedSource(1);
109:
110:                SampleModel s1sm = src1.getSampleModel();
111:                SampleModel s2sm = src2.getSampleModel();
112:
113:                if (s1sm.getNumBands() != s2sm.getNumBands()
114:                        || s1sm.getTransferType() != s2sm.getTransferType()) {
115:                    msg.append(getName() + " "
116:                            + JaiI18N.getString("OverlayDescriptor1"));
117:                    return false;
118:                }
119:
120:                return true;
121:            }
122:
123:            /**
124:             * Overlays one image on top of another.
125:             *
126:             * <p>Creates a <code>ParameterBlockJAI</code> from all
127:             * supplied arguments except <code>hints</code> and invokes
128:             * {@link JAI#create(String,ParameterBlock,RenderingHints)}.
129:             *
130:             * @see JAI
131:             * @see ParameterBlockJAI
132:             * @see RenderedOp
133:             *
134:             * @param source0 <code>RenderedImage</code> source 0.
135:             * @param source1 <code>RenderedImage</code> source 1.
136:             * @param hints The <code>RenderingHints</code> to use.
137:             * May be <code>null</code>.
138:             * @return The <code>RenderedOp</code> destination.
139:             * @throws IllegalArgumentException if <code>source0</code> is <code>null</code>.
140:             * @throws IllegalArgumentException if <code>source1</code> is <code>null</code>.
141:             */
142:            public static RenderedOp create(RenderedImage source0,
143:                    RenderedImage source1, RenderingHints hints) {
144:                ParameterBlockJAI pb = new ParameterBlockJAI("Overlay",
145:                        RenderedRegistryMode.MODE_NAME);
146:
147:                pb.setSource("source0", source0);
148:                pb.setSource("source1", source1);
149:
150:                return JAI.create("Overlay", pb, hints);
151:            }
152:
153:            /**
154:             * Overlays one image on top of another.
155:             *
156:             * <p>Creates a <code>ParameterBlockJAI</code> from all
157:             * supplied arguments except <code>hints</code> and invokes
158:             * {@link JAI#createRenderable(String,ParameterBlock,RenderingHints)}.
159:             *
160:             * @see JAI
161:             * @see ParameterBlockJAI
162:             * @see RenderableOp
163:             *
164:             * @param source0 <code>RenderableImage</code> source 0.
165:             * @param source1 <code>RenderableImage</code> source 1.
166:             * @param hints The <code>RenderingHints</code> to use.
167:             * May be <code>null</code>.
168:             * @return The <code>RenderableOp</code> destination.
169:             * @throws IllegalArgumentException if <code>source0</code> is <code>null</code>.
170:             * @throws IllegalArgumentException if <code>source1</code> is <code>null</code>.
171:             */
172:            public static RenderableOp createRenderable(
173:                    RenderableImage source0, RenderableImage source1,
174:                    RenderingHints hints) {
175:                ParameterBlockJAI pb = new ParameterBlockJAI("Overlay",
176:                        RenderableRegistryMode.MODE_NAME);
177:
178:                pb.setSource("source0", source0);
179:                pb.setSource("source1", source1);
180:
181:                return JAI.createRenderable("Overlay", pb, hints);
182:            }
183:        }
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