Source Code Cross Referenced for CRIFImpl.java in  » 6.0-JDK-Modules » Java-Advanced-Imaging » javax » media » jai » 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 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: CRIFImpl.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 04:57:05 $
010:         * $State: Exp $
011:         */
012:        package javax.media.jai;
013:
014:        import java.awt.RenderingHints;
015:        import java.awt.geom.Rectangle2D;
016:        import java.awt.geom.Rectangle2D.Float;
017:        import java.awt.image.RenderedImage;
018:        import java.awt.image.renderable.ContextualRenderedImageFactory;
019:        import java.awt.image.renderable.ParameterBlock;
020:        import java.awt.image.renderable.RenderableImage;
021:        import java.awt.image.renderable.RenderContext;
022:        import javax.media.jai.ImageLayout;
023:        import javax.media.jai.JAI;
024:        import javax.media.jai.RenderedOp;
025:        import javax.media.jai.registry.RenderedRegistryMode;
026:        import javax.media.jai.util.ImagingException;
027:        import javax.media.jai.util.ImagingListener;
028:        import com.sun.media.jai.util.ImageUtil;
029:
030:        /**
031:         * A utility class to minimize in most cases the effort required to implement
032:         * the <code>ContextualRenderedImageFactory</code> (CRIF) of an operation.
033:         * An extender of this class is required to implement only the method
034:         * <code>RenderedImage create(ParameterBlock, RenderingHints)</code>
035:         * defined in the <code>RenderedImageFactory</code> interface.  The remaining
036:         * methods may be overridden insofar as this is necessary to obtain behavior
037:         * different from that provided by default.
038:         *
039:         * @see java.awt.image.renderable.ContextualRenderedImageFactory
040:         * @see java.awt.image.renderable.RenderedImageFactory
041:         * @since JAI 1.1
042:         */
043:        // This class was actually added in JAI EA2 but was then in
044:        // com.sun.media.jai.opimage. It was moved to the public API in JAI 1.1.
045:        public abstract class CRIFImpl implements 
046:                ContextualRenderedImageFactory {
047:
048:            /**
049:             * If non-<code>null</code>, this name will be used as a parameter to
050:             * <code>JAI.create()</code> in
051:             * <code>create(RenderContext,ParameterBlock)</code>; otherwise the RIF
052:             * <code>create(ParameterBlock,RenderingHints)</code> method implemented
053:             * in the extending class will be invoked.
054:             */
055:            protected String operationName = null;
056:
057:            /**
058:             * Default constructor.  The operation name is set to <code>null</code>.
059:             */
060:            public CRIFImpl() {
061:                this .operationName = null;
062:            }
063:
064:            /**
065:             * Constructor.  The operation name is set to the specified value
066:             * which may be <code>null</code>.
067:             */
068:            public CRIFImpl(String operationName) {
069:                this .operationName = operationName;
070:            }
071:
072:            /**
073:             * The <code>RenderedImageFactory</code> <code>create()</code> method
074:             * which must be implemented by concrete subclasses.
075:             */
076:            public abstract RenderedImage create(ParameterBlock paramBlock,
077:                    RenderingHints renderHints);
078:
079:            /**
080:             * Creates a <code>RenderedImage</code> from the renderable layer.
081:             *
082:             * <p> If <code>operationName</code> is non-<code>null</code>,
083:             * <code>JAI.create()</code> will be invoked using the supplied
084:             * <code>ParameterBlock</code> and the <code>RenderingHints</code>
085:             * contained in the <code>RenderContext</code>.  If
086:             * <code>operationName</code> is <code>null</code>, or
087:             * <code>JAI.create()</code> returns <code>null</code>, the
088:             * <code>create(ParameterBlock,RenderingHints)</code> method defined
089:             * in the extending class will be invoked.
090:             *
091:             * @param renderContext The rendering information associated with
092:             *        this rendering.
093:             * @param paramBlock The parameters used to create the image.
094:             * @return A <code>RenderedImage</code>.
095:             */
096:            public RenderedImage create(RenderContext renderContext,
097:                    ParameterBlock paramBlock) {
098:                RenderingHints renderHints = renderContext.getRenderingHints();
099:                if (operationName != null) {
100:                    OperationRegistry registry = renderHints == null ? null
101:                            : (OperationRegistry) renderHints
102:                                    .get(JAI.KEY_OPERATION_REGISTRY);
103:
104:                    RenderedImage rendering;
105:
106:                    if (registry == null) {
107:                        // Call the JAI.create method to get the best implementation
108:                        rendering = JAI.create(operationName, paramBlock,
109:                                renderHints);
110:                    } else { // registry != null
111:                        // NB: This section is lifted pretty much verbatim from
112:                        // JAI.createNS().
113:
114:                        // Get the OperationDescriptor registered under the
115:                        // specified name.
116:                        OperationDescriptor odesc = (OperationDescriptor) registry
117:                                .getDescriptor(OperationDescriptor.class,
118:                                        operationName);
119:                        if (odesc == null) {
120:                            throw new IllegalArgumentException(operationName
121:                                    + ": " + JaiI18N.getString("JAI0"));
122:                        }
123:
124:                        // Does this operation support rendered mode?
125:                        if (!odesc
126:                                .isModeSupported(RenderedRegistryMode.MODE_NAME)) {
127:                            throw new IllegalArgumentException(operationName
128:                                    + ": " + JaiI18N.getString("JAI1"));
129:                        }
130:
131:                        // Check the destination image type.
132:                        if (!RenderedImage.class.isAssignableFrom(odesc
133:                                .getDestClass(RenderedRegistryMode.MODE_NAME))) {
134:                            throw new IllegalArgumentException(operationName
135:                                    + ": " + JaiI18N.getString("JAI2"));
136:                        }
137:
138:                        // Validate input arguments. The ParameterBlock is cloned here
139:                        // because OperationDescriptor.validateArguments() may change
140:                        // its content.
141:                        StringBuffer msg = new StringBuffer();
142:                        paramBlock = (ParameterBlock) paramBlock.clone();
143:                        if (!odesc
144:                                .validateArguments(
145:                                        RenderedRegistryMode.MODE_NAME,
146:                                        paramBlock, msg)) {
147:                            throw new IllegalArgumentException(msg.toString());
148:                        }
149:
150:                        // Create the rendered operation node.
151:                        rendering = new RenderedOp(registry, operationName,
152:                                paramBlock, renderHints);
153:                    }
154:
155:                    // Return the rendering if possible.
156:                    if (rendering != null) {
157:                        // If the rendering is a rendered chain, replace it by its
158:                        // rendering which will likely be an OpImage chain.
159:                        if (rendering instanceof  RenderedOp) {
160:                            try {
161:                                rendering = ((RenderedOp) rendering)
162:                                        .getRendering();
163:                            } catch (Exception e) {
164:                                ImagingListener listener = ImageUtil
165:                                        .getImagingListener(renderHints);
166:                                String message = JaiI18N.getString("CRIFImpl0")
167:                                        + operationName;
168:                                listener.errorOccurred(message, e, this , false);
169:                                //                        e.printStackTrace();
170:                            }
171:                        }
172:                        return rendering;
173:                    }
174:                }
175:
176:                // Call the RIF create method of the extending class
177:                return create(paramBlock, renderHints);
178:            }
179:
180:            /**
181:             * Maps the destination <code>RenderContext</code> into a
182:             * <code>RenderContext</code> for each source.  The
183:             * implementation in this class simply returns the
184:             * <code>RenderContext</code> passed in by the caller.
185:             *
186:             * @param i The index of the source image.
187:             * @param renderContext The <code>RenderContext</code> being applied to
188:             *        the operation.
189:             * @param paramBlock A <code>ParameterBlock</code> containing the
190:             *        sources and parameters of the operation.
191:             * @param image The <code>RenderableImage</code> being rendered.
192:             *
193:             * @return The <code>RenderContext</code> to be used to render the
194:             *         given source.
195:             */
196:            public RenderContext mapRenderContext(int i,
197:                    RenderContext renderContext, ParameterBlock paramBlock,
198:                    RenderableImage image) {
199:                return renderContext;
200:            }
201:
202:            /**
203:             * Returns the bounding box for the output of the operation.  The
204:             * implementation in this class computes the bounding box as the
205:             * intersection the bounding boxes of all the (renderable sources).
206:             *
207:             * @param paramBlock A <code>ParameterBlock</code> containing the
208:             *        sources and parameters of the operation.
209:             * @return A <code>Rectangle2D</code> specifying the bounding box.
210:             */
211:            public Rectangle2D getBounds2D(ParameterBlock paramBlock) {
212:                int numSources = paramBlock.getNumSources();
213:
214:                if (numSources == 0) {
215:                    return null;
216:                }
217:
218:                RenderableImage src = paramBlock.getRenderableSource(0);
219:                Rectangle2D.Float box1 = new Rectangle2D.Float(src.getMinX(),
220:                        src.getMinY(), src.getWidth(), src.getHeight());
221:
222:                for (int i = 1; i < numSources; i++) {
223:                    src = paramBlock.getRenderableSource(i);
224:                    Rectangle2D.Float box2 = new Rectangle2D.Float(src
225:                            .getMinX(), src.getMinY(), src.getWidth(), src
226:                            .getHeight());
227:                    box1 = (Rectangle2D.Float) box1.createIntersection(box2);
228:                    if (box1.isEmpty()) {
229:                        break;
230:                    }
231:                }
232:
233:                return box1;
234:            }
235:
236:            /**
237:             * Returns the appropriate instance of the property with the indicated
238:             * name.
239:             *
240:             * <p> The implementation in this class always returns
241:             * <code>java.awt.Image.UndefinedProperty</code> since
242:             * no properties are defined by default.
243:             *
244:             * @param paramBlock A <code>ParameterBlock</code> containing the
245:             *        sources and parameters of the operation.
246:             * @param name A <code>String</code> containing the desired property name.
247:             *
248:             * @return the value <code>java.awt.Image.UndefinedProperty</code>
249:             *         indicating that the property is undefined.
250:             */
251:            public Object getProperty(ParameterBlock paramBlock, String name) {
252:                return java.awt.Image.UndefinedProperty;
253:            }
254:
255:            /**
256:             * Returns the valid property names for the operation.  The
257:             * implementation in this class always returns <code>null</code>
258:             * since no properties are associated with the operation by
259:             * default.
260:             *
261:             * @return <code>null</code> indicating that no properties are defined.
262:             */
263:            public String[] getPropertyNames() {
264:                return null;
265:            }
266:
267:            /**
268:             * Returns <code>true</code> if successive renderings with the same
269:             * arguments may produce different results.  The implementation in this
270:             * class always returns <code>false</code> so as to enable caching
271:             * of renderings by default.  CRIFs that do implement dynamic
272:             * rendering behavior must override this method.
273:             *
274:             * @return <code>false</code> indicating that the rendering is static.
275:             */
276:            public boolean isDynamic() {
277:                return false;
278:            }
279:        }
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