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	/*
	* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package sun.java2d.cmm.lcms;

	import java.awt.image.BufferedImage;
	import java.awt.image.ComponentColorModel;
	import java.awt.image.ComponentSampleModel;
	import java.awt.image.DataBuffer;
	import java.awt.image.ColorModel;
	import java.awt.image.Raster;
	import java.awt.image.SampleModel;
	import sun.awt.image.ByteComponentRaster;
	import sun.awt.image.ShortComponentRaster;
	import sun.awt.image.IntegerComponentRaster;

	class LCMSImageLayout {

	public static int BYTES_SH(int x) {
	return x;
	}

	public static int EXTRA_SH(int x) {
	return x << 7;
	}

	public static int CHANNELS_SH(int x) {
	return x << 3;
	}
	public static final int SWAPFIRST = 1 << 14;
	public static final int DOSWAP = 1 << 10;
	public static final int PT_RGB_8 =
	CHANNELS_SH(3) \| BYTES_SH(1);
	public static final int PT_GRAY_8 =
	CHANNELS_SH(1) \| BYTES_SH(1);
	public static final int PT_GRAY_16 =
	CHANNELS_SH(1) \| BYTES_SH(2);
	public static final int PT_RGBA_8 =
	EXTRA_SH(1) \| CHANNELS_SH(3) \| BYTES_SH(1);
	public static final int PT_ARGB_8 =
	EXTRA_SH(1) \| CHANNELS_SH(3) \| BYTES_SH(1) \| SWAPFIRST;
	public static final int PT_BGR_8 =
	DOSWAP \| CHANNELS_SH(3) \| BYTES_SH(1);
	public static final int PT_ABGR_8 =
	DOSWAP \| EXTRA_SH(1) \| CHANNELS_SH(3) \| BYTES_SH(1);
	public static final int PT_BGRA_8 = EXTRA_SH(1) \| CHANNELS_SH(3)
	\| BYTES_SH(1) \| DOSWAP \| SWAPFIRST;
	public static final int DT_BYTE = 0;
	public static final int DT_SHORT = 1;
	public static final int DT_INT = 2;
	public static final int DT_DOUBLE = 3;
	boolean isIntPacked = false;
	int pixelType;
	int dataType;
	int width;
	int height;
	int nextRowOffset;
	private int nextPixelOffset;
	int offset;

	/* This flag indicates whether the image can be processed
	* at once by doTransfrom() native call. Otherwise, the
	* image is processed scan by scan.
	*/
	private boolean imageAtOnce = false;
	Object dataArray;

	private int dataArrayLength; /* in bytes */

	private LCMSImageLayout(int np, int pixelType, int pixelSize)
	throws ImageLayoutException
	{
	this.pixelType = pixelType;
	width = np;
	height = 1;
	nextPixelOffset = pixelSize;
	nextRowOffset = safeMult(pixelSize, np);
	offset = 0;
	}

	private LCMSImageLayout(int width, int height, int pixelType,
	int pixelSize)
	throws ImageLayoutException
	{
	this.pixelType = pixelType;
	this.width = width;
	this.height = height;
	nextPixelOffset = pixelSize;
	nextRowOffset = safeMult(pixelSize, width);
	offset = 0;
	}


	public LCMSImageLayout(byte[] data, int np, int pixelType, int pixelSize)
	throws ImageLayoutException
	{
	this(np, pixelType, pixelSize);
	dataType = DT_BYTE;
	dataArray = data;
	dataArrayLength = data.length;

	verify();
	}

	public LCMSImageLayout(short[] data, int np, int pixelType, int pixelSize)
	throws ImageLayoutException
	{
	this(np, pixelType, pixelSize);
	dataType = DT_SHORT;
	dataArray = data;
	dataArrayLength = 2 * data.length;

	verify();
	}

	public LCMSImageLayout(int[] data, int np, int pixelType, int pixelSize)
	throws ImageLayoutException
	{
	this(np, pixelType, pixelSize);
	dataType = DT_INT;
	dataArray = data;
	dataArrayLength = 4 * data.length;

	verify();
	}

	public LCMSImageLayout(double[] data, int np, int pixelType, int pixelSize)
	throws ImageLayoutException
	{
	this(np, pixelType, pixelSize);
	dataType = DT_DOUBLE;
	dataArray = data;
	dataArrayLength = 8 * data.length;

	verify();
	}

	private LCMSImageLayout() {
	}

	/* This method creates a layout object for given image.
	* Returns null if the image is not supported by current implementation.
	*/
	public static LCMSImageLayout createImageLayout(BufferedImage image) throws ImageLayoutException {
	LCMSImageLayout l = new LCMSImageLayout();

	switch (image.getType()) {
	case BufferedImage.TYPE_INT_RGB:
	l.pixelType = PT_ARGB_8;
	l.isIntPacked = true;
	break;
	case BufferedImage.TYPE_INT_ARGB:
	l.pixelType = PT_ARGB_8;
	l.isIntPacked = true;
	break;
	case BufferedImage.TYPE_INT_BGR:
	l.pixelType = PT_ABGR_8;
	l.isIntPacked = true;
	break;
	case BufferedImage.TYPE_3BYTE_BGR:
	l.pixelType = PT_BGR_8;
	break;
	case BufferedImage.TYPE_4BYTE_ABGR:
	l.pixelType = PT_ABGR_8;
	break;
	case BufferedImage.TYPE_BYTE_GRAY:
	l.pixelType = PT_GRAY_8;
	break;
	case BufferedImage.TYPE_USHORT_GRAY:
	l.pixelType = PT_GRAY_16;
	break;
	default:
	/* ColorConvertOp creates component images as
	* default destination, so this kind of images
	* has to be supported.
	*/
	ColorModel cm = image.getColorModel();
	if (cm instanceof ComponentColorModel) {
	ComponentColorModel ccm = (ComponentColorModel) cm;

	// verify whether the component size is fine
	int[] cs = ccm.getComponentSize();
	for (int s : cs) {
	if (s != 8) {
	return null;
	}
	}

	return createImageLayout(image.getRaster());

	}
	return null;
	}

	l.width = image.getWidth();
	l.height = image.getHeight();

	switch (image.getType()) {
	case BufferedImage.TYPE_INT_RGB:
	case BufferedImage.TYPE_INT_ARGB:
	case BufferedImage.TYPE_INT_BGR:
	do {
	IntegerComponentRaster intRaster = (IntegerComponentRaster)
	image.getRaster();
	l.nextRowOffset = safeMult(4, intRaster.getScanlineStride());
	l.nextPixelOffset = safeMult(4, intRaster.getPixelStride());
	l.offset = safeMult(4, intRaster.getDataOffset(0));
	l.dataArray = intRaster.getDataStorage();
	l.dataArrayLength = 4 * intRaster.getDataStorage().length;
	l.dataType = DT_INT;

	if (l.nextRowOffset == l.width * 4 * intRaster.getPixelStride()) {
	l.imageAtOnce = true;
	}
	} while (false);
	break;

	case BufferedImage.TYPE_3BYTE_BGR:
	case BufferedImage.TYPE_4BYTE_ABGR:
	do {
	ByteComponentRaster byteRaster = (ByteComponentRaster)
	image.getRaster();
	l.nextRowOffset = byteRaster.getScanlineStride();
	l.nextPixelOffset = byteRaster.getPixelStride();

	int firstBand = image.getSampleModel().getNumBands() - 1;
	l.offset = byteRaster.getDataOffset(firstBand);
	l.dataArray = byteRaster.getDataStorage();
	l.dataArrayLength = byteRaster.getDataStorage().length;
	l.dataType = DT_BYTE;
	if (l.nextRowOffset == l.width * byteRaster.getPixelStride()) {
	l.imageAtOnce = true;
	}
	} while (false);
	break;

	case BufferedImage.TYPE_BYTE_GRAY:
	do {
	ByteComponentRaster byteRaster = (ByteComponentRaster)
	image.getRaster();
	l.nextRowOffset = byteRaster.getScanlineStride();
	l.nextPixelOffset = byteRaster.getPixelStride();

	l.dataArrayLength = byteRaster.getDataStorage().length;
	l.offset = byteRaster.getDataOffset(0);
	l.dataArray = byteRaster.getDataStorage();
	l.dataType = DT_BYTE;

	if (l.nextRowOffset == l.width * byteRaster.getPixelStride()) {
	l.imageAtOnce = true;
	}
	} while (false);
	break;

	case BufferedImage.TYPE_USHORT_GRAY:
	do {
	ShortComponentRaster shortRaster = (ShortComponentRaster)
	image.getRaster();
	l.nextRowOffset = safeMult(2, shortRaster.getScanlineStride());
	l.nextPixelOffset = safeMult(2, shortRaster.getPixelStride());

	l.offset = safeMult(2, shortRaster.getDataOffset(0));
	l.dataArray = shortRaster.getDataStorage();
	l.dataArrayLength = 2 * shortRaster.getDataStorage().length;
	l.dataType = DT_SHORT;

	if (l.nextRowOffset == l.width * 2 * shortRaster.getPixelStride()) {
	l.imageAtOnce = true;
	}
	} while (false);
	break;
	default:
	return null;
	}
	l.verify();
	return l;
	}

	private static enum BandOrder {
	DIRECT,
	INVERTED,
	ARBITRARY,
	UNKNOWN;

	public static BandOrder getBandOrder(int[] bandOffsets) {
	BandOrder order = UNKNOWN;

	int numBands = bandOffsets.length;

	for (int i = 0; (order != ARBITRARY) && (i < bandOffsets.length); i++) {
	switch (order) {
	case UNKNOWN:
	if (bandOffsets[i] == i) {
	order = DIRECT;
	} else if (bandOffsets[i] == (numBands - 1 - i)) {
	order = INVERTED;
	} else {
	order = ARBITRARY;
	}
	break;
	case DIRECT:
	if (bandOffsets[i] != i) {
	order = ARBITRARY;
	}
	break;
	case INVERTED:
	if (bandOffsets[i] != (numBands - 1 - i)) {
	order = ARBITRARY;
	}
	break;
	}
	}
	return order;
	}
	}

	private void verify() throws ImageLayoutException {

	if (offset < 0 \|\| offset >= dataArrayLength) {
	throw new ImageLayoutException("Invalid image layout");
	}

	if (nextPixelOffset != getBytesPerPixel(pixelType)) {
	throw new ImageLayoutException("Invalid image layout");
	}

	int lastScanOffset = safeMult(nextRowOffset, (height - 1));

	int lastPixelOffset = safeMult(nextPixelOffset, (width -1 ));

	lastPixelOffset = safeAdd(lastPixelOffset, lastScanOffset);

	int off = safeAdd(offset, lastPixelOffset);

	if (off < 0 \|\| off >= dataArrayLength) {
	throw new ImageLayoutException("Invalid image layout");
	}
	}

	static int safeAdd(int a, int b) throws ImageLayoutException {
	long res = a;
	res += b;
	if (res < Integer.MIN_VALUE \|\| res > Integer.MAX_VALUE) {
	throw new ImageLayoutException("Invalid image layout");
	}
	return (int)res;
	}

	static int safeMult(int a, int b) throws ImageLayoutException {
	long res = a;
	res *= b;
	if (res < Integer.MIN_VALUE \|\| res > Integer.MAX_VALUE) {
	throw new ImageLayoutException("Invalid image layout");
	}
	return (int)res;
	}

	public static class ImageLayoutException extends Exception {
	public ImageLayoutException(String message) {
	super(message);
	}
	}
	public static LCMSImageLayout createImageLayout(Raster r) {
	LCMSImageLayout l = new LCMSImageLayout();
	if (r instanceof ByteComponentRaster &&
	r.getSampleModel() instanceof ComponentSampleModel) {
	ByteComponentRaster br = (ByteComponentRaster)r;

	ComponentSampleModel csm = (ComponentSampleModel)r.getSampleModel();

	l.pixelType = CHANNELS_SH(br.getNumBands()) \| BYTES_SH(1);

	int[] bandOffsets = csm.getBandOffsets();
	BandOrder order = BandOrder.getBandOrder(bandOffsets);

	int firstBand = 0;
	switch (order) {
	case INVERTED:
	l.pixelType \|= DOSWAP;
	firstBand = csm.getNumBands() - 1;
	break;
	case DIRECT:
	// do nothing
	break;
	default:
	// unable to create the image layout;
	return null;
	}

	l.nextRowOffset = br.getScanlineStride();
	l.nextPixelOffset = br.getPixelStride();

	l.offset = br.getDataOffset(firstBand);
	l.dataArray = br.getDataStorage();
	l.dataType = DT_BYTE;

	l.width = br.getWidth();
	l.height = br.getHeight();

	if (l.nextRowOffset == l.width * br.getPixelStride()) {
	l.imageAtOnce = true;
	}
	return l;
	}
	return null;
	}

	/**
	* Derives number of bytes per pixel from the pixel format.
	* Following bit fields are used here:
	* [0..2] - bytes per sample
	* [3..6] - number of color samples per pixel
	* [7..9] - number of non-color samples per pixel
	*
	* A complete description of the pixel format can be found
	* here: lcms2.h, lines 651 - 667.
	*
	* @param pixelType pixel format in lcms2 notation.
	* @return number of bytes per pixel for given pixel format.
	*/
	private static int getBytesPerPixel(int pixelType) {
	int bytesPerSample = (0x7 & pixelType);
	int colorSamplesPerPixel = 0xF & (pixelType >> 3);
	int extraSamplesPerPixel = 0x7 & (pixelType >> 7);

	return bytesPerSample * (colorSamplesPerPixel + extraSamplesPerPixel);
	}
	}

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