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/*
* Copyright (c) 2010, Michael Bedward. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jaitools.media.jai;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.util.Vector;
import javax.media.jai.ImageLayout;
import javax.media.jai.OpImage;
import javax.media.jai.ROI;
/**
* Abstract base class for operators that generate non-image attributes from a
* source image while passing source image pixels directly to destination pixels.
*
* @author Michael Bedward
* @since 1.1
* @version $Id: AttributeOpImage.java 1777 2011-06-21 12:13:03Z michael.bedward $
*/
public abstract class AttributeOpImage extends OpImage {
/**
* An optional ROI to define the region over which to derive attributes.
* If an ROI is not provided this will be set to an ROIShape having the
* bounds of the source image.
*/
protected ROI roi;
/**
* Bounds of the source image as a convenience.
*/
protected Rectangle srcBounds;
/**
* Constructor.
*
* @param source the source image from from which to derive attributes
* @param roi an optional {@code ROI} to define sub-region(s) of the
* source image to examine.
*/
public AttributeOpImage(RenderedImage source, ROI roi) {
super(wrapSource(source),
new ImageLayout(source),
null,
false);
this.roi = roi;
this.srcBounds = getSourceImage(0).getBounds();
}
/**
* Helper function for constructor. Wraps the given image in a {@code Vector}
* as required by {@link OpImage} constructor. Also checks for a null
* source image.
*
* @param img the image to wrap
* @return a new {@code Vector} containing the image
*/
private static Vector wrapSource(RenderedImage img) {
if (img == null) {
throw new IllegalArgumentException("Source image must not be null");
}
Vector v = new Vector();
v.add(img);
return v;
}
/**
* Always returns false since source and destination tiles are the same.
*/
@Override
public boolean computesUniqueTiles() {
return false;
}
/**
* Gets the requested image tile (which will be from the source image).
*
* @param tileX tile X index
* @param tileY tile Y index
*
* @return the requested tile
*/
@Override
public Raster getTile(int tileX, int tileY) {
return this.getSourceImage(0).getTile(tileX, tileY);
}
/**
* Handles a request to compute image data for a given tile by
* simply passing a getTile request to the source image.
*
* @param tileX tile X index
* @param tileY tile Y index
*
* @return the requested tile
*/
@Override
public Raster computeTile(int tileX, int tileY) {
return getTile(tileX, tileY);
}
/**
* Gets the requested image tiles (which will be from the source image).
*
* @param tileIndices tile X and Y indices as {@code Points}
*
* @throws IllegalArgumentException If {@code tileIndices} is {@code null}.
*/
@Override
public Raster[] getTiles(Point[] tileIndices) {
if ( tileIndices == null ) {
throw new IllegalArgumentException("tileIndices must not be null");
}
return getSourceImage(0).getTiles(tileIndices);
}
/**
* Maps the source rectangle into destination space (which will be identical).
*
* @param sourceRect the {@code Rectangle} in source image coordinates
*
* @param sourceIndex the index of the source image (must be 0 since there
* is only one source image)
*
* @return A new {@code Rectangle} with identical bounds to {@code sourceRect}
*
* @throws IllegalArgumentException if {@code sourceRect} is {@code null}
* @throws IllegalArgumentException if {@code sourceIndex} is not 0
*/
public Rectangle mapSourceRect(Rectangle sourceRect, int sourceIndex) {
if ( sourceRect == null ) {
throw new IllegalArgumentException("sourceRect must not be null");
}
if (sourceIndex != 0) {
throw new IllegalArgumentException("sourceIndex arg must be 0");
}
return new Rectangle(sourceRect);
}
/**
* Maps the destination rectangle into source image space (which will be identical).
*
* @param destRect the {@code Rectangle} in destination image coordinates
*
* @param sourceIndex the index of the source image (must be 0 since there
* is only one source image)
*
* @return A new {@code Rectangle} with identical bounds to {@code destRect}
*
* @throws IllegalArgumentException if {@code destRect} is {@code null}
* @throws IllegalArgumentException if {@code sourceIndex} is not 0
*/
public Rectangle mapDestRect(Rectangle destRect, int sourceIndex) {
if ( destRect == null ) {
throw new IllegalArgumentException("destRect must not be null");
}
if (sourceIndex != 0) {
throw new IllegalArgumentException("sourceIndex arg must be 0");
}
return new Rectangle(destRect);
}
/**
* Retrieves an attribute by name. Calling this method will fire a request
* for it to be generated if it has not already been so, or if the sub-class
* does not cache the attribute.
*
* @param name the attribute name
*
* @return the requested attribute or {@code null} if the name does not
* match any of the available attributes
*
* @throws IllegalArgumentException if {@code name} is {@code null}
*/
protected abstract Object getAttribute(String name);
/**
* Returns the class of the specified attribute. This
* default implementation always returns class Object.
*
* @param name attribute name
* @return the attribute class
*/
protected Class getAttributeClass(String name) {
return Object.class;
}
/**
* Returns the names of available attributes.
*
* @return attribute names
*/
protected abstract String[] getAttributeNames();
private boolean isAttributeName(String name) {
String[] attributeNames = getAttributeNames();
for (int i = 0; i < attributeNames.length; i++) {
if (name.equalsIgnoreCase(attributeNames[i])) {
return true;
}
}
return false;
}
@Override
public Object getProperty(String name) {
if (isAttributeName(name)) {
return getAttribute(name);
}
return super.getProperty(name);
}
@Override
public Class getPropertyClass(String name) {
if (isAttributeName(name)) {
return getAttributeClass(name);
}
return super.getPropertyClass(name);
}
@Override
public String[] getPropertyNames() {
String[] superNames = super.getPropertyNames();
if (superNames == null) superNames = new String[0];
String[] myNames = getAttributeNames();
if (myNames == null) myNames = new String[0];
String[] names = new String[superNames.length + myNames.length];
int i, k = 0;
for (i = 0; i < superNames.length; i++) names[k++] = superNames[i];
for (i = 0; i < myNames.length; i++) names[k++] = myNames[i];
return names;
}
}
