/*
* $RCSfile: WarpDescriptor.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:57:46 $
* $State: Exp $
*/
package com.lightcrafts.mediax.jai.operator;
import com.lightcrafts.media.jai.util.PropertyGeneratorImpl;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.Point2D;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import com.lightcrafts.mediax.jai.GeometricOpImage;
import com.lightcrafts.mediax.jai.ImageLayout;
import com.lightcrafts.mediax.jai.Interpolation;
import com.lightcrafts.mediax.jai.InterpolationNearest;
import com.lightcrafts.mediax.jai.JAI;
import com.lightcrafts.mediax.jai.OperationDescriptorImpl;
import com.lightcrafts.mediax.jai.ParameterBlockJAI;
import com.lightcrafts.mediax.jai.PlanarImage;
import com.lightcrafts.mediax.jai.PropertyGenerator;
import com.lightcrafts.mediax.jai.ROI;
import com.lightcrafts.mediax.jai.ROIShape;
import com.lightcrafts.mediax.jai.RenderedOp;
import com.lightcrafts.mediax.jai.Warp;
import com.lightcrafts.mediax.jai.registry.RenderedRegistryMode;
/**
* This property generator computes the properties for the operation
* "Warp" dynamically.
*/
class WarpPropertyGenerator extends PropertyGeneratorImpl {
/** Constructor. */
public WarpPropertyGenerator() {
super(new String[] {"ROI"},
new Class[] {ROI.class},
new Class[] {RenderedOp.class});
}
/**
* Returns the specified property.
*
* @param name Property name.
* @param opNode Operation node.
*/
public Object getProperty(String name,
Object opNode) {
validate(name, opNode);
if(opNode instanceof RenderedOp &&
name.equalsIgnoreCase("roi")) {
RenderedOp op = (RenderedOp)opNode;
ParameterBlock pb = op.getParameterBlock();
// Retrieve the rendered source image and its ROI.
RenderedImage src = (RenderedImage)pb.getRenderedSource(0);
Object property = src.getProperty("ROI");
if (property == null ||
property.equals(java.awt.Image.UndefinedProperty) ||
!(property instanceof ROI)) {
return java.awt.Image.UndefinedProperty;
}
// Return undefined also if source ROI is empty.
ROI srcROI = (ROI)property;
if (srcROI.getBounds().isEmpty()) {
return java.awt.Image.UndefinedProperty;
}
// Retrieve the Interpolation object.
Interpolation interp = (Interpolation)pb.getObjectParameter(1);
// Determine the effective source bounds.
Rectangle srcBounds = null;
PlanarImage dst = op.getRendering();
if (dst instanceof GeometricOpImage &&
((GeometricOpImage)dst).getBorderExtender() == null) {
srcBounds =
new Rectangle(src.getMinX() + interp.getLeftPadding(),
src.getMinY() + interp.getTopPadding(),
src.getWidth() - interp.getWidth() + 1,
src.getHeight() - interp.getHeight() + 1);
} else {
srcBounds = new Rectangle(src.getMinX(),
src.getMinY(),
src.getWidth(),
src.getHeight());
}
// If necessary, clip the ROI to the effective source bounds.
if(!srcBounds.contains(srcROI.getBounds())) {
srcROI = srcROI.intersect(new ROIShape(srcBounds));
}
// Set the nearest neighbor interpolation object.
Interpolation interpNN = interp instanceof InterpolationNearest ?
interp :
Interpolation.getInstance(Interpolation.INTERP_NEAREST);
// Retrieve the Warp object.
Warp warp = (Warp)pb.getObjectParameter(0);
// Create the warped ROI.
ROI dstROI = new ROI(JAI.create("warp", srcROI.getAsImage(),
warp, interpNN));
// Retrieve the destination bounds.
Rectangle dstBounds = op.getBounds();
// If necessary, clip the warped ROI to the destination bounds.
if(!dstBounds.contains(dstROI.getBounds())) {
dstROI = dstROI.intersect(new ROIShape(dstBounds));
}
// Return the warped and possibly clipped ROI.
return dstROI;
}
return java.awt.Image.UndefinedProperty;
}
}
/**
* An <code>OperationDescriptor</code> describing the "Warp" operation.
*
* <p> The "Warp" operation performs (possibly filtered) general
* warping on an image.
*
* <p> The destination bounds may be specified by an {@link ImageLayout}
* hint provided via a {@link RenderingHints} supplied to the operation. If
* no bounds are so specified, then the destination bounds will be set to
* the minimum bounding rectangle of the forward mapped source bounds
* calculated using {@link Warp#mapSourceRect(Rectangle)} or, failing that,
* {@link Warp#mapSourcePoint(Point2D)} applied to the vertices of the
* source bounds. If forward mapping by both methods is not viable, then
* an approximate affine mapping will be created and used to determine the
* destination bounds by forward mapping the source bounds. If this approach
* also fails, then the destination bounds will be set to the source bounds.
*
* <p> "Warp" defines a PropertyGenerator that
* performs an identical transformation on the "ROI" property of the
* source image, which can be retrieved by calling the
* <code>getProperty</code> method with "ROI" as the property name.
*
* <p> The parameter, "backgroundValues", is defined to
* fill the background with the user-specified background
* values. These background values will be translated into background
* colors by the <code>ColorModel</code> when the image is displayed.
* With the default value, <code>{0.0}</code>, of this parameter,
* the background pixels are filled with 0s. If the provided array
* length is smaller than the number of bands, the first element of
* the provided array is used for all the bands. If the provided values
* are out of the data range of the destination image, they will be clamped
* into the proper range.
*
* <p> It should be noted that this operation automatically adds a
* value of <code>Boolean.TRUE</code> for the
* <code>JAI.KEY_REPLACE_INDEX_COLOR_MODEL</code> to the given
* <code>configuration</code> so that the operation is performed
* on the pixel values instead of being performed on the indices into
* the color map if the source(s) have an <code>IndexColorModel</code>.
* This addition will take place only if a value for the
* <code>JAI.KEY_REPLACE_INDEX_COLOR_MODEL</code> has not already been
* provided by the user. Note that the <code>configuration</code> Map
* is cloned before the new hint is added to it. The operation can be
* smart about the value of the <code>JAI.KEY_REPLACE_INDEX_COLOR_MODEL</code>
* <code>RenderingHints</code>, i.e. while the default value for the
* <code>JAI.KEY_REPLACE_INDEX_COLOR_MODEL</code> is
* <code>Boolean.TRUE</code>, in some cases the operator could set the
* default.
*
* <p><table border=1>
* <caption>Resource List</caption>
* <tr><th>Name</th> <th>Value</th></tr>
* <tr><td>GlobalName</td> <td>Warp</td></tr>
* <tr><td>LocalName</td> <td>Warp</td></tr>
* <tr><td>Vendor</td> <td>com.lightcrafts.media.jai</td></tr>
* <tr><td>Description</td> <td>Warps an image according
* to a specified Warp object.</td></tr>
* <tr><td>DocURL</td> <td>http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/WarpDescriptor.html</td></tr>
* <tr><td>Version</td> <td>1.0</td></tr>
* <tr><td>arg0Desc</td> <td>The Warp object.</td></tr>
* <tr><td>arg1Desc</td> <td>The interpolation method.</td></tr>
* </table></p>
*
* <p><table border=1>
* <caption>Parameter List</caption>
* <tr><th>Name</th> <th>Class Type</th>
* <th>Default Value</th></tr>
* <tr><td>warp</td> <td>com.lightcrafts.mediax.jai.Warp</td>
* <td>NO_PARAMETER_DEFAULT</td>
* <tr><td>interpolation</td> <td>com.lightcrafts.mediax.jai.Interpolation</td>
* <td>InterpolationNearest</td>
* <tr><td>backgroundValues</td> <td>double[]</td>
* <td>{0.0}</td>
* </table></p>
*
* @see com.lightcrafts.mediax.jai.Interpolation
* @see com.lightcrafts.mediax.jai.Warp
* @see com.lightcrafts.mediax.jai.OperationDescriptor
*/
public class WarpDescriptor extends OperationDescriptorImpl {
/**
* The resource strings that provide the general documentation and
* specify the parameter list for the "Warp" operation.
*/
private static final String[][] resources = {
{"GlobalName", "Warp"},
{"LocalName", "Warp"},
{"Vendor", "com.lightcrafts.media.jai"},
{"Description", JaiI18N.getString("WarpDescriptor0")},
{"DocURL", "http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/WarpDescriptor.html"},
{"Version", JaiI18N.getString("DescriptorVersion")},
{"arg0Desc", JaiI18N.getString("WarpDescriptor1")},
{"arg1Desc", JaiI18N.getString("WarpDescriptor2")},
{"arg2Desc", JaiI18N.getString("WarpDescriptor3")}
};
/** The parameter names for the "Warp" operation. */
private static final String[] paramNames = {
"warp", "interpolation", "backgroundValues"
};
/** The parameter class types for the "Warp" operation. */
private static final Class[] paramClasses = {
com.lightcrafts.mediax.jai.Warp.class, com.lightcrafts.mediax.jai.Interpolation.class,
double[].class
};
/** The parameter default values for the "Warp" operation. */
private static final Object[] paramDefaults = {
NO_PARAMETER_DEFAULT,
Interpolation.getInstance(Interpolation.INTERP_NEAREST),
new double[] {0.0}
};
/** Constructor. */
public WarpDescriptor() {
super(resources, 1, paramClasses, paramNames, paramDefaults);
}
/**
* Returns an array of <code>PropertyGenerators</code> implementing
* property inheritance for the "Warp" operation.
*
* @return An array of property generators.
*/
public PropertyGenerator[] getPropertyGenerators() {
PropertyGenerator[] pg = new PropertyGenerator[1];
pg[0] = new WarpPropertyGenerator();
return pg;
}
/**
* Warps an image according to a specified Warp object.
*
* <p>Creates a <code>ParameterBlockJAI</code> from all
* supplied arguments except <code>hints</code> and invokes
* {@link JAI#create(String,ParameterBlock,RenderingHints)}.
*
* @see JAI
* @see ParameterBlockJAI
* @see RenderedOp
*
* @param source0 <code>RenderedImage</code> source 0.
* @param warp The warp object.
* @param interpolation The interpolation method.
* May be <code>null</code>.
* @param backgroundValues The user-specified background values.
* May be <code>null</code>.
* @param hints The <code>RenderingHints</code> to use.
* May be <code>null</code>.
* @return The <code>RenderedOp</code> destination.
* @throws IllegalArgumentException if <code>source0</code> is <code>null</code>.
* @throws IllegalArgumentException if <code>warp</code> is <code>null</code>.
*/
public static RenderedOp create(RenderedImage source0,
Warp warp,
Interpolation interpolation,
double[] backgroundValues,
RenderingHints hints) {
ParameterBlockJAI pb =
new ParameterBlockJAI("Warp",
RenderedRegistryMode.MODE_NAME);
pb.setSource("source0", source0);
pb.setParameter("warp", warp);
pb.setParameter("interpolation", interpolation);
pb.setParameter("backgroundValues", backgroundValues);
return JAI.create("Warp", pb, hints);
}
}