com.github.jaiimageio.impl.plugins.clib.CLibImageReader Maven / Gradle / Ivy

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Java Advanced Imaging Image I/O Tools API core, but without the classes involved with javax.media.jai dependencies, JPEG2000 or codecLibJIIO, meaning that this library can be distributed under the modified BSD license and should be GPL compatible.
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/*
 * $RCSfile: CLibImageReader.java,v $
 *
 * 
 * Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 
 * 
 * - Redistribution of source code must retain the above copyright 
 *   notice, this  list of conditions and the following disclaimer.
 * 
 * - Redistribution 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.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of 
 * contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any 
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES. 
 * 
 * You acknowledge that this software is not designed or intended for 
 * use in the design, construction, operation or maintenance of any 
 * nuclear facility. 
 *
 * $Revision: 1.11 $
 * $Date: 2006/02/28 01:33:31 $
 * $State: Exp $
 */
package com.github.jaiimageio.impl.plugins.clib;

import java.awt.image.DataBuffer;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.NoSuchElementException;

import javax.imageio.ImageReader;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.spi.ImageReaderSpi;
//import com.sun.medialib.codec.jiio.Constants;
//import com.sun.medialib.codec.jiio.mediaLibImage;

// XXX Need to verify compliance of all methods with ImageReader specificaiton.
public abstract class CLibImageReader extends ImageReader {
    // The current image index.
    private int currIndex = -1;

    // The position of the byte after the last byte read so far.
    private long highWaterMark = Long.MIN_VALUE;

    // An ArrayList of Longs indicating the stream
    // positions of the start of each image. Entries are added as needed.
    private ArrayList imageStartPosition = new ArrayList();

    // The number of images in the stream, if known, otherwise -1.
    private int numImages = -1;

//    // The image returned by the codecLib Decoder.
//    private mediaLibImage mlibImage = null;

    // The index of the cached image.
    private int mlibImageIndex = -1;

    /**
     * Returns true if and only if both arguments are null or
     * both are non-null and have the same length and content.
     */
    private static boolean subBandsMatch(int[] sourceBands,
                                         int[] destinationBands) {
        if(sourceBands == null && destinationBands == null) {
            return true;
        } else if(sourceBands != null && destinationBands != null) {
            if (sourceBands.length != destinationBands.length) {
                // Shouldn't happen ...
                return false;
            }
            for (int i = 0; i < sourceBands.length; i++) {
                if (sourceBands[i] != destinationBands[i]) {
                    return false;
                }
            }
            return true;
        }

        return false;
    }

    private static final void subsample(Raster src, int subX, int subY,
                                        WritableRaster dst) {
        int sx0 = src.getMinX();
        int sy0 = src.getMinY();
        int sw = src.getWidth();
        int syUB = sy0 + src.getHeight();

        int dx0 = dst.getMinX();
        int dy0 = dst.getMinY();
        int dw = dst.getWidth();

        int b = src.getSampleModel().getNumBands();
        int t = src.getSampleModel().getDataType();

        int numSubSamples = (sw + subX - 1)/subX;

        if(t == DataBuffer.TYPE_FLOAT || t == DataBuffer.TYPE_DOUBLE) {
            float[] fsamples = new float[sw];
            float[] fsubsamples = new float[numSubSamples];

            for(int k = 0; k < b; k++) {
                for(int sy = sy0, dy = dy0; sy < syUB; sy += subY, dy++) {
                    src.getSamples(sx0, sy, sw, 1, k, fsamples);
                    for(int i = 0, s = 0; i < sw; s++, i += subX) {
                        fsubsamples[s] = fsamples[i];
                    }
                    dst.setSamples(dx0, dy, dw, 1, k, fsubsamples);
                }
            }
        } else {
            int[] samples = new int[sw];
            int[] subsamples = new int[numSubSamples];

            for(int k = 0; k < b; k++) {
                for(int sy = sy0, dy = dy0; sy < syUB; sy += subY, dy++) {
                    src.getSamples(sx0, sy, sw, 1, k, samples);
                    for(int i = 0, s = 0; i < sw; s++, i += subX) {
                        subsamples[s] = samples[i];
                    }
                    dst.setSamples(dx0, dy, dw, 1, k, subsamples);
                }
            }
        }
    }                                 

    protected CLibImageReader(ImageReaderSpi originatingProvider) {
        super(originatingProvider);
    }

    /**
     * An Iterator over a single element.
     */
    private class SoloIterator implements Iterator {
        Object theObject;

        SoloIterator(Object o) {
            if(o == null) {
                new IllegalArgumentException
                    (I18N.getString("CLibImageReader0"));
            }
            theObject = o;
        }

        public boolean hasNext() {
            return theObject != null;
        }

        public Object next() {
            if(theObject == null) {
                throw new NoSuchElementException();
            }
            Object theNextObject = theObject;
            theObject = null;
            return theNextObject;
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }
    }

    


    /**
     * Returns the index of the image cached in the private
     * mlibImage instance variable or -1 if no
     * image is currently cached.
     */
    protected int getImageIndex() {
        return mlibImageIndex;
    }


    public IIOMetadata getStreamMetadata() throws IOException {
        return null;
    }
}