/*

 * Copyright (c) 1997, 2014, 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

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 * questions.

 */

package sun.awt.image;

import java.awt.image.Raster;

import java.awt.image.WritableRaster;

import java.awt.image.RasterFormatException;

import java.awt.image.SampleModel;

import java.awt.image.ComponentSampleModel;

import java.awt.image.SinglePixelPackedSampleModel;

import java.awt.image.DataBuffer;

import java.awt.image.DataBufferUShort;

import java.awt.Rectangle;

import java.awt.Point;

/**

 * This class defines a Raster with pixels consisting of one or more 16-bit

 * data elements stored in close proximity to each other in a short integer

 * array.  The bit precision per data element is that

 * of the data type (that is, the bit precision for this Raster is 16).

 * There is only one pixel stride and one scanline stride for all

 * bands.  This type of Raster can be used with a

 * ComponentColorModel if there are multiple bands, or a

 * IndexColorModel if there is only one band.

 * <p>

 * For example, 5-6-5 RGB image data can be represented by a

 * ShortComponentRaster using a SinglePixelPackedSampleModel and

 * a ComponentColorModel.

 *

 *

 */

public class ShortComponentRaster extends SunWritableRaster {

    /** private band offset for use by native code */

    protected int bandOffset;

    /** Data offsets for each band of image data. */

    protected int[]         dataOffsets;

    /** Scanline stride of the image data contained in this Raster. */

    protected int           scanlineStride;

    /** Pixel stride of the image data contained in this Raster. */

    protected int           pixelStride;

    /** The image data array. */

    protected short[]       data;

    int type;

    /** A cached copy of minX + width for use in bounds checks. */

    private int maxX;

    /** A cached copy of minY + height for use in bounds checks. */

    private int maxY;

    static {

        /* ensure that the necessary native libraries are loaded */

        NativeLibLoader.loadLibraries();

        initIDs();

    }

    /**

     *  Constructs a ShortComponentRaster with the given SampleModel.

     *  The Raster's upper left corner is origin and it is the same

     *  size as the SampleModel.  A DataBuffer large enough to describe the

     *  Raster is automatically created.  SampleModel must be of type

     *  ComponentSampleModel or SinglePixelPackedSampleModel.

     *  @param sampleModel     The SampleModel that specifies the layout.

     *  @param origin          The Point that specified the origin.

     */

    public ShortComponentRaster(SampleModel sampleModel, Point origin) {

        this(sampleModel,

             sampleModel.createDataBuffer(),

             new Rectangle(origin.x,

                           origin.y,

                           sampleModel.getWidth(),

                           sampleModel.getHeight()),

             origin,

             null);

    }

    /**

     * Constructs a ShortComponentRaster with the given SampleModel

     * and DataBuffer.  The Raster's upper left corner is origin and

     * it is the same sizes the SampleModel.  The DataBuffer is not

     * initialized and must be a DataBufferUShort compatible with SampleModel.

     * SampleModel must be of type ComponentSampleModel or

     * SinglePixelPackedSampleModel.

     * @param sampleModel     The SampleModel that specifies the layout.

     * @param dataBuffer      The DataBufferUShort that contains the image data.

     * @param origin          The Point that specifies the origin.

     */

    public ShortComponentRaster(SampleModel sampleModel,

                                   DataBuffer dataBuffer,

                                   Point origin) {

        this(sampleModel,

             dataBuffer,

             new Rectangle(origin.x,

                           origin.y,

                           sampleModel.getWidth(),

                           sampleModel.getHeight()),

             origin,

             null);

    }

    /**

     * Constructs a ShortComponentRaster with the given SampleModel,

     * DataBuffer, and parent.  DataBuffer must be a DataBufferUShort and

     * SampleModel must be of type ComponentSampleModel or

     * SinglePixelPackedSampleModel.  When translated into the base Raster's

     * coordinate system, aRegion must be contained by the base Raster.

     * Origin is the coodinate in the new Raster's coordinate system of

     * the origin of the base Raster.  (The base Raster is the Raster's

     * ancestor which has no parent.)

     *

     * Note that this constructor should generally be called by other

     * constructors or create methods, it should not be used directly.

     * @param sampleModel     The SampleModel that specifies the layout.

     * @param dataBuffer      The DataBufferUShort that contains the image data.

     * @param aRegion         The Rectangle that specifies the image area.

     * @param origin          The Point that specifies the origin.

     * @param parent          The parent (if any) of this raster.

     */

    public ShortComponentRaster(SampleModel sampleModel,

                                   DataBuffer dataBuffer,

                                   Rectangle aRegion,

                                   Point origin,

                                   ShortComponentRaster parent) {

        super(sampleModel, dataBuffer, aRegion, origin, parent);

        this.maxX = minX + width;

        this.maxY = minY + height;

        if(!(dataBuffer instanceof DataBufferUShort)) {

            throw new RasterFormatException("ShortComponentRasters must have "+

                                            "short DataBuffers");

        }

        DataBufferUShort dbus = (DataBufferUShort)dataBuffer;

        this.data = stealData(dbus, 0);

        if (dbus.getNumBanks() != 1) {

            throw new

                RasterFormatException("DataBuffer for ShortComponentRasters"+

                                      " must only have 1 bank.");

        }

        int dbOffset = dbus.getOffset();

        if (sampleModel instanceof ComponentSampleModel) {

            ComponentSampleModel csm = (ComponentSampleModel)sampleModel;

            this.type = IntegerComponentRaster.TYPE_USHORT_SAMPLES;

            this.scanlineStride = csm.getScanlineStride();

            this.pixelStride = csm.getPixelStride();

            this.dataOffsets = csm.getBandOffsets();

            int xOffset = aRegion.x - origin.x;

            int yOffset = aRegion.y - origin.y;

            for (int i = 0; i < getNumDataElements(); i++) {

                dataOffsets[i] += dbOffset +

                    xOffset*pixelStride+yOffset*scanlineStride;

            }

        } else if (sampleModel instanceof SinglePixelPackedSampleModel) {

            SinglePixelPackedSampleModel sppsm =

                    (SinglePixelPackedSampleModel)sampleModel;

            this.type = IntegerComponentRaster.TYPE_USHORT_PACKED_SAMPLES;

            this.scanlineStride = sppsm.getScanlineStride();

            this.pixelStride    = 1;

            this.dataOffsets = new int[1];

            this.dataOffsets[0] = dbOffset;

            int xOffset = aRegion.x - origin.x;

            int yOffset = aRegion.y - origin.y;

            dataOffsets[0] += xOffset+yOffset*scanlineStride;

        } else {

            throw new RasterFormatException("ShortComponentRasters must have"+

                "ComponentSampleModel or SinglePixelPackedSampleModel");

        }

        this.bandOffset = this.dataOffsets[0];

        verify();

    }

    /**

     * Returns a copy of the data offsets array. For each band the data offset

     * is the index into the band's data array, of the first sample of the

     * band.

     */

    public int[] getDataOffsets() {

        return dataOffsets.clone();

    }

    /**

     * Returns the data offset for the specified band.  The data offset

     * is the index into the data array in which the first sample

     * of the first scanline is stored.

     * @param band  The band whose offset is returned.

     */

    public int getDataOffset(int band) {

        return dataOffsets[band];

    }

    /**

     * Returns the scanline stride -- the number of data array elements between

     * a given sample and the same sample in the same column of the next row.

     */

    public int getScanlineStride() {

        return scanlineStride;

    }

    /**

     * Returns pixel stride -- the number of data array elements  between two

     * samples for the same band on the same scanline.

     */

    public int getPixelStride() {

        return pixelStride;

    }

    /**

     * Returns a reference to the data array.

     */

    public short[] getDataStorage() {

        return data;

    }

    /**

     * Returns the data elements for all bands at the specified

     * location.

     * An ArrayIndexOutOfBounds exception will be thrown at runtime

     * if the pixel coordinate is out of bounds.

     * A ClassCastException will be thrown if the input object is non null

     * and references anything other than an array of transferType.

     * @param x        The X coordinate of the pixel location.

     * @param y        The Y coordinate of the pixel location.

     * @param obj      An object reference to an array of type defined by

     *                 getTransferType() and length getNumDataElements().

     *                 If null an array of appropriate type and size will be

     *                 allocated.

     * @return         An object reference to an array of type defined by

     *                 getTransferType() with the request pixel data.

     */

    public Object getDataElements(int x, int y, Object obj) {

        if ((x < this.minX) || (y < this.minY) ||

            (x >= this.maxX) || (y >= this.maxY)) {

            throw new ArrayIndexOutOfBoundsException

                ("Coordinate out of bounds!");

        }

        short outData[];

        if (obj == null) {

            outData = new short[numDataElements];

        } else {

            outData = (short[])obj;

        }

        int off = (y-minY)*scanlineStride +

                  (x-minX)*pixelStride;

        for (int band = 0; band < numDataElements; band++) {

            outData[band] = data[dataOffsets[band] + off];

        }

        return outData;

    }

    /**

     * Returns an array  of data elements from the specified rectangular

     * region.

     * An ArrayIndexOutOfBounds exception will be thrown at runtime

     * if the pixel coordinates are out of bounds.

     * A ClassCastException will be thrown if the input object is non null

     * and references anything other than an array of transferType.

     * <pre>

     *       short[] bandData = (short[])Raster.getDataElements(x, y, w, h, null);

     *       int numDataElements = Raster.getBands();

     *       short[] pixel = new short[numDataElements];

     *       // To find the data element at location (x2, y2)

     *       System.arraycopy(bandData, ((y2-y)*w + (x2-x))*numDataElements,

     *                        pixel, 0, numDataElements);

     * </pre>

     * @param x        The X coordinate of the upper left pixel location.

     * @param y        The Y coordinate of the upper left pixel location.

     * @param w        Width of the pixel rectangle.

     * @param h        Height of the pixel rectangle.

     * @param obj      An object reference to an array of type defined by

     *                 getTransferType() and length w*h*getNumDataElements().

     *                 If null an array of appropriate type and size will be

     *                 allocated.

     * @return         An object reference to an array of type defined by

     *                 getTransferType() with the request pixel data.

     */

    public Object getDataElements(int x, int y, int w, int h, Object obj) {

        if ((x < this.minX) || (y < this.minY) ||

            (x + w > this.maxX) || (y + h > this.maxY)) {

            throw new ArrayIndexOutOfBoundsException

                ("Coordinate out of bounds!");

        }

        short outData[];

        if (obj == null) {

            outData = new short[w*h*numDataElements];

        } else {

            outData = (short[])obj;

        }

        int yoff = (y-minY)*scanlineStride +

                   (x-minX)*pixelStride;

        int xoff;

        int off = 0;

        int xstart;

        int ystart;

        for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {

            xoff = yoff;

            for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {

                for (int c = 0; c < numDataElements; c++) {

                    outData[off++] = data[dataOffsets[c] + xoff];

                }

            }

        }

        return outData;

    }

    /**

     * Returns a short integer array of data elements from the

     * specified rectangular region.

     * An ArrayIndexOutOfBounds exception will be thrown at runtime

     * if the pixel coordinates are out of bounds.

     * <pre>

     *       short[] bandData = Raster.getShortData(x, y, w, h, null);

     *       // To find the data element at location (x2, y2)

     *       short dataElenent = bandData[((y2-y)*w + (x2-x))];

     * </pre>

     * @param x        The X coordinate of the upper left pixel location.

     * @param y        The Y coordinate of the upper left pixel location.

     * @param w        Width of the sample rectangle.

     * @param h        Height of the sample rectangle.

     * @param band     The band to return.

     * @param outData  If non-null, data elements for all bands

     *                 at the specified location are returned in this array.

     * @return         Data array with data elements for all bands.

     */

    public short[] getShortData(int x, int y, int w, int h,

                               int band, short[] outData) {

        // Bounds check for 'band' will be performed automatically

        if ((x < this.minX) || (y < this.minY) ||

            (x + w > this.maxX) || (y + h > this.maxY)) {

            throw new ArrayIndexOutOfBoundsException

                ("Coordinate out of bounds!");

        }

        if (outData == null) {

            outData = new short[numDataElements*w*h];

        }

        int yoff =  (y-minY)*scanlineStride +

                    (x-minX)*pixelStride+ dataOffsets[band];

        int xoff;

        int off = 0;

        int xstart;

        int ystart;

        if (pixelStride == 1) {

            if (scanlineStride == w) {

                System.arraycopy(data, yoff, outData, 0, w*h);

            }

            else {

                for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {

                    System.arraycopy(data, yoff, outData, off, w);

                    off += w;

                }

            }

        }

        else {

            for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {

                xoff = yoff;

                for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {

                    outData[off++] = data[xoff];

                }

            }

        }

        return outData;

    }

    /**

     * Returns a short integer array  of data elements from the

     * specified rectangular region.

     * An ArrayIndexOutOfBounds exception will be thrown at runtime

     * if the pixel coordinates are out of bounds.

     * <pre>

     *       short[] bandData = Raster.getShortData(x, y, w, h, null);

     *       int numDataElements = Raster.getNumBands();

     *       short[] pixel = new short[numDataElements];

     *       // To find the data element at location (x2, y2)

     *       System.arraycopy(bandData, ((y2-y)*w + (x2-x))*numDataElements,

     *                        pixel, 0, numDataElements);

     * </pre>

     * @param x        The X coordinate of the upper left pixel location.

     * @param y        The Y coordinate of the upper left pixel location.

     * @param w        Width of the pixel rectangle.

     * @param h        Height of the pixel rectangle.

     * @param outData  If non-null, data elements for all bands

     *                 at the specified location are returned in this array.

     * @return         Data array with data elements for all bands.

     */

    public short[] getShortData(int x, int y, int w, int h, short[] outData) {

        if ((x < this.minX) || (y < this.minY) ||

            (x + w > this.maxX) || (y + h > this.maxY)) {

            throw new ArrayIndexOutOfBoundsException

                ("Coordinate out of bounds!");

        }

        if (outData == null) {

            outData = new short[numDataElements*w*h];

        }

        int yoff = (y-minY)*scanlineStride +

                   (x-minX)*pixelStride;

        int xoff;

        int off = 0;

        int xstart;

        int ystart;

        for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {

            xoff = yoff;

            for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {

                for (int c = 0; c < numDataElements; c++) {

                    outData[off++] = data[dataOffsets[c] + xoff];

                }

            }

        }

        return outData;

    }

    /**

     * Stores the data elements for all bands at the specified location.

     * An ArrayIndexOutOfBounds exception will be thrown at runtime

     * if the pixel coordinate is out of bounds.

     * A ClassCastException will be thrown if the input object is non null

     * and references anything other than an array of transferType.

     * @param x        The X coordinate of the pixel location.

     * @param y        The Y coordinate of the pixel location.

     * @param obj      An object reference to an array of type defined by

     *                 getTransferType() and length getNumDataElements()

     *                 containing the pixel data to place at x,y.

     */

    public void setDataElements(int x, int y, Object obj) {

        if ((x < this.minX) || (y < this.minY) ||

            (x >= this.maxX) || (y >= this.maxY)) {

            throw new ArrayIndexOutOfBoundsException

                ("Coordinate out of bounds!");

        }

        short inData[] = (short[])obj;

        int off = (y-minY)*scanlineStride +

                  (x-minX)*pixelStride;

        for (int i = 0; i < numDataElements; i++) {

            data[dataOffsets[i] + off] = inData[i];

        }

        markDirty();

    }

    /**

     * Stores the Raster data at the specified location.

     * An ArrayIndexOutOfBounds exception will be thrown at runtime

     * if the pixel coordinates are out of bounds.

     * @param x          The X coordinate of the pixel location.

     * @param y          The Y coordinate of the pixel location.

     * @param inRaster   Raster of data to place at x,y location.

     */

    public void setDataElements(int x, int y, Raster inRaster) {

        int dstOffX = x + inRaster.getMinX();

        int dstOffY = y + inRaster.getMinY();

        int width  = inRaster.getWidth();

        int height = inRaster.getHeight();

        if ((dstOffX < this.minX) || (dstOffY < this.minY) ||

            (dstOffX + width > this.maxX) || (dstOffY + height > this.maxY)) {

            throw new ArrayIndexOutOfBoundsException

                ("Coordinate out of bounds!");

        }

        setDataElements(dstOffX, dstOffY, width, height, inRaster);

    }

    /**

     * Stores the Raster data at the specified location.

     * @param dstX The absolute X coordinate of the destination pixel

     * that will receive a copy of the upper-left pixel of the

     * inRaster

     * @param dstY The absolute Y coordinate of the destination pixel

     * that will receive a copy of the upper-left pixel of the

     * inRaster

     * @param width      The number of pixels to store horizontally

     * @param height     The number of pixels to store vertically

     * @param inRaster   Raster of data to place at x,y location.

     */

    private void setDataElements(int dstX, int dstY,

                                 int width, int height,

                                 Raster inRaster) {

        // Assume bounds checking has been performed previously

        if (width <= 0 || height <= 0) {

            return;

        }

        // Write inRaster (minX, minY) to (dstX, dstY)

        int srcOffX = inRaster.getMinX();

        int srcOffY = inRaster.getMinY();

        Object tdata = null;