Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\image\impl\BaseIntToByteConverter.java

/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
 *
 *
 *
 *
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 *
 *
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 */

package com.sun.javafx.image.impl;

import com.sun.javafx.image.BytePixelSetter;
import com.sun.javafx.image.IntPixelGetter;
import com.sun.javafx.image.IntToBytePixelConverter;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;

public abstract class BaseIntToByteConverter
    implements IntToBytePixelConverter
{
    protected final IntPixelGetter  getter;
    protected final BytePixelSetter setter;
    protected final int nDstElems;

BaseIntToByteConverter(IntPixelGetter getter, BytePixelSetter setter) {
        this.getter = getter;
        this.setter = setter;
        this.nDstElems = setter.getNumElements();
    }

@Override
    public final IntPixelGetter getGetter() {
        return getter;
    }

@Override
    public final BytePixelSetter getSetter() {
        return setter;
    }

abstract void doConvert(int  srcarr[], int srcoff, int srcscanints,
                            byte dstarr[], int dstoff, int dstscanbytes,
                            int w, int h);

abstract void doConvert(IntBuffer  srcbuf, int srcoff, int srcscanints,
                            ByteBuffer dstbuf, int dstoff, int dstscanbytes,
                            int w, int h);

@Override
    public final void convert(int  srcarr[], int srcoff, int srcscanints,
                              byte dstarr[], int dstoff, int dstscanbytes,
                              int w, int h)
    {
        if (w <= 0 || h <= 0) return;
        if (srcscanints  == w &&
            dstscanbytes == w * nDstElems)
        {
            w *= h;
            h = 1;
        }
        doConvert(srcarr, srcoff, srcscanints,
                  dstarr, dstoff, dstscanbytes,
                  w, h);
    }

@Override
    public final void convert(IntBuffer  srcbuf, int srcoff, int srcscanints,
                              ByteBuffer dstbuf, int dstoff, int dstscanbytes,
                              int w, int h)
    {
        if (w <= 0 || h <= 0) return;
        if (srcscanints  == w &&
            dstscanbytes == w * nDstElems)
        {
            w *= h;
            h = 1;
        }
        if (srcbuf.hasArray() && dstbuf.hasArray()) {
            srcoff += srcbuf.arrayOffset();
            dstoff += dstbuf.arrayOffset();
            doConvert(srcbuf.array(), srcoff, srcscanints,
                      dstbuf.array(), dstoff, dstscanbytes,
                      w, h);
        } else {
            doConvert(srcbuf, srcoff, srcscanints,
                      dstbuf, dstoff, dstscanbytes,
                      w, h);
        }
    }

@Override
    public final void convert(IntBuffer srcbuf,   int srcoff, int srcscanints,
                              byte      dstarr[], int dstoff, int dstscanbytes,
                              int w, int h)
    {
        if (w <= 0 || h <= 0) return;
        if (srcscanints  == w &&
            dstscanbytes == w * nDstElems)
        {
            w *= h;
            h = 1;
        }
        if (srcbuf.hasArray()) {
            int srcarr[] = srcbuf.array();
            srcoff += srcbuf.arrayOffset();
            doConvert(srcarr, srcoff, srcscanints,
                      dstarr, dstoff, dstscanbytes,
                      w, h);
        } else {
            ByteBuffer dstbuf = ByteBuffer.wrap(dstarr);
            doConvert(srcbuf, srcoff, srcscanints,
                      dstbuf, dstoff, dstscanbytes,
                      w, h);
        }
    }

@Override
    public final void convert(int        srcarr[], int srcoff, int srcscanints,
                              ByteBuffer dstbuf,   int dstoff, int dstscanbytes,
                              int w, int h)
    {
        if (w <= 0 || h <= 0) return;
        if (srcscanints  == w &&
            dstscanbytes == w * nDstElems)
        {
            w *= h;
            h = 1;
        }
        if (dstbuf.hasArray()) {
            byte dstarr[] = dstbuf.array();
            dstoff += dstbuf.arrayOffset();
            doConvert(srcarr, srcoff, srcscanints,
                      dstarr, dstoff, dstscanbytes,
                      w, h);
        } else {
            IntBuffer srcbuf = IntBuffer.wrap(srcarr);
            doConvert(srcbuf, srcoff, srcscanints,
                      dstbuf, dstoff, dstscanbytes,
                      w, h);
        }
    }
}

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