/*

 * Copyright 1997-2006 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package java.awt.image;

import java.awt.Transparency;

import java.awt.color.ColorSpace;

import java.awt.Graphics2D;

import java.awt.GraphicsConfiguration;

import java.awt.GraphicsEnvironment;

import java.awt.ImageCapabilities;

import java.awt.geom.Rectangle2D;

import java.awt.geom.Point2D;

import java.awt.Point;

import java.awt.Rectangle;

import java.util.Hashtable;

import java.util.Vector;

import sun.awt.image.BytePackedRaster;

import sun.awt.image.ShortComponentRaster;

import sun.awt.image.ByteComponentRaster;

import sun.awt.image.IntegerComponentRaster;

import sun.awt.image.OffScreenImageSource;

/**

 *

 * The <code>BufferedImage</code> subclass describes an {@link

 * java.awt.Image Image} with an accessible buffer of image data.

 * A <code>BufferedImage</code> is comprised of a {@link ColorModel} and a

 * {@link Raster} of image data.

 * The number and types of bands in the {@link SampleModel} of the

 * <code>Raster</code> must match the number and types required by the

 * <code>ColorModel</code> to represent its color and alpha components.

 * All <code>BufferedImage</code> objects have an upper left corner

 * coordinate of (0,&nbsp;0).  Any <code>Raster</code> used to construct a

 * <code>BufferedImage</code> must therefore have minX=0 and minY=0.

 *

 * <p>

 * This class relies on the data fetching and setting methods

 * of <code>Raster</code>,

 * and on the color characterization methods of <code>ColorModel</code>.

 *

 * @see ColorModel

 * @see Raster

 * @see WritableRaster

 */

public class BufferedImage extends java.awt.Image

                           implements WritableRenderedImage, Transparency

{

    int        imageType = TYPE_CUSTOM;

    ColorModel colorModel;

    WritableRaster raster;

    OffScreenImageSource osis;

    Hashtable properties;

    boolean    isAlphaPremultiplied;// If true, alpha has been premultiplied in

    // color channels

    /**

     * Image Type Constants

     */

    /**

     * Image type is not recognized so it must be a customized

     * image.  This type is only used as a return value for the getType()

     * method.

     */

    public static final int TYPE_CUSTOM = 0;

    /**

     * Represents an image with 8-bit RGB color components packed into

     * integer pixels.  The image has a {@link DirectColorModel} without

     * alpha.

     * When data with non-opaque alpha is stored

     * in an image of this type,

     * the color data must be adjusted to a non-premultiplied form

     * and the alpha discarded,

     * as described in the

     * {@link java.awt.AlphaComposite} documentation.

     */

    public static final int TYPE_INT_RGB = 1;

    /**

     * Represents an image with 8-bit RGBA color components packed into

     * integer pixels.  The image has a <code>DirectColorModel</code>

     * with alpha. The color data in this image is considered not to be

     * premultiplied with alpha.  When this type is used as the

     * <code>imageType</code> argument to a <code>BufferedImage</code>

     * constructor, the created image is consistent with images

     * created in the JDK1.1 and earlier releases.

     */

    public static final int TYPE_INT_ARGB = 2;

    /**

     * Represents an image with 8-bit RGBA color components packed into

     * integer pixels.  The image has a <code>DirectColorModel</code>

     * with alpha.  The color data in this image is considered to be

     * premultiplied with alpha.

     */

    public static final int TYPE_INT_ARGB_PRE = 3;

    /**

     * Represents an image with 8-bit RGB color components, corresponding

     * to a Windows- or Solaris- style BGR color model, with the colors

     * Blue, Green, and Red packed into integer pixels.  There is no alpha.

     * The image has a {@link DirectColorModel}.

     * When data with non-opaque alpha is stored

     * in an image of this type,

     * the color data must be adjusted to a non-premultiplied form

     * and the alpha discarded,

     * as described in the

     * {@link java.awt.AlphaComposite} documentation.

     */

    public static final int TYPE_INT_BGR = 4;

    /**

     * Represents an image with 8-bit RGB color components, corresponding

     * to a Windows-style BGR color model) with the colors Blue, Green,

     * and Red stored in 3 bytes.  There is no alpha.  The image has a

     * <code>ComponentColorModel</code>.

     * When data with non-opaque alpha is stored

     * in an image of this type,

     * the color data must be adjusted to a non-premultiplied form

     * and the alpha discarded,

     * as described in the

     * {@link java.awt.AlphaComposite} documentation.

     */

    public static final int TYPE_3BYTE_BGR = 5;

    /**

     * Represents an image with 8-bit RGBA color components with the colors

     * Blue, Green, and Red stored in 3 bytes and 1 byte of alpha.  The

     * image has a <code>ComponentColorModel</code> with alpha.  The

     * color data in this image is considered not to be premultiplied with

     * alpha.  The byte data is interleaved in a single

     * byte array in the order A, B, G, R

     * from lower to higher byte addresses within each pixel.

     */

    public static final int TYPE_4BYTE_ABGR = 6;

    /**

     * Represents an image with 8-bit RGBA color components with the colors

     * Blue, Green, and Red stored in 3 bytes and 1 byte of alpha.  The

     * image has a <code>ComponentColorModel</code> with alpha. The color

     * data in this image is considered to be premultiplied with alpha.

     * The byte data is interleaved in a single byte array in the order

     * A, B, G, R from lower to higher byte addresses within each pixel.

     */

    public static final int TYPE_4BYTE_ABGR_PRE = 7;

    /**

     * Represents an image with 5-6-5 RGB color components (5-bits red,

     * 6-bits green, 5-bits blue) with no alpha.  This image has

     * a <code>DirectColorModel</code>.

     * When data with non-opaque alpha is stored

     * in an image of this type,

     * the color data must be adjusted to a non-premultiplied form

     * and the alpha discarded,

     * as described in the

     * {@link java.awt.AlphaComposite} documentation.

     */

    public static final int TYPE_USHORT_565_RGB = 8;

    /**

     * Represents an image with 5-5-5 RGB color components (5-bits red,

     * 5-bits green, 5-bits blue) with no alpha.  This image has

     * a <code>DirectColorModel</code>.

     * When data with non-opaque alpha is stored

     * in an image of this type,

     * the color data must be adjusted to a non-premultiplied form

     * and the alpha discarded,

     * as described in the

     * {@link java.awt.AlphaComposite} documentation.

     */

    public static final int TYPE_USHORT_555_RGB = 9;

    /**

     * Represents a unsigned byte grayscale image, non-indexed.  This

     * image has a <code>ComponentColorModel</code> with a CS_GRAY

     * {@link ColorSpace}.

     * When data with non-opaque alpha is stored

     * in an image of this type,

     * the color data must be adjusted to a non-premultiplied form

     * and the alpha discarded,

     * as described in the

     * {@link java.awt.AlphaComposite} documentation.

     */

    public static final int TYPE_BYTE_GRAY = 10;

    /**

     * Represents an unsigned short grayscale image, non-indexed).  This

     * image has a <code>ComponentColorModel</code> with a CS_GRAY

     * <code>ColorSpace</code>.

     * When data with non-opaque alpha is stored

     * in an image of this type,

     * the color data must be adjusted to a non-premultiplied form

     * and the alpha discarded,

     * as described in the

     * {@link java.awt.AlphaComposite} documentation.

     */

    public static final int TYPE_USHORT_GRAY = 11;

    /**

     * Represents an opaque byte-packed 1, 2, or 4 bit image.  The

     * image has an {@link IndexColorModel} without alpha.  When this

     * type is used as the <code>imageType</code> argument to the

     * <code>BufferedImage</code> constructor that takes an

     * <code>imageType</code> argument but no <code>ColorModel</code>

     * argument, a 1-bit image is created with an

     * <code>IndexColorModel</code> with two colors in the default

     * sRGB <code>ColorSpace</code>: {0,&nbsp;0,&nbsp;0} and

     * {255, 255, 255}.

     *

     * <p> Images with 2 or 4 bits per pixel may be constructed via

     * the <code>BufferedImage</code> constructor that takes a

     * <code>ColorModel</code> argument by supplying a

     * <code>ColorModel</code> with an appropriate map size.

     *

     * <p> Images with 8 bits per pixel should use the image types

     * <code>TYPE_BYTE_INDEXED</code> or <code>TYPE_BYTE_GRAY</code>

     * depending on their <code>ColorModel</code>.

     * <p> When color data is stored in an image of this type,

     * the closest color in the colormap is determined

     * by the <code>IndexColorModel</code> and the resulting index is stored.

     * Approximation and loss of alpha or color components

     * can result, depending on the colors in the

     * <code>IndexColorModel</code> colormap.

     */

    public static final int TYPE_BYTE_BINARY = 12;

    /**

     * Represents an indexed byte image.  When this type is used as the

     * <code>imageType</code> argument to the <code>BufferedImage</code>

     * constructor that takes an <code>imageType</code> argument

     * but no <code>ColorModel</code> argument, an

     * <code>IndexColorModel</code> is created with

     * a 256-color 6/6/6 color cube palette with the rest of the colors

     * from 216-255 populated by grayscale values in the

     * default sRGB ColorSpace.

     *

     * <p> When color data is stored in an image of this type,

     * the closest color in the colormap is determined

     * by the <code>IndexColorModel</code> and the resulting index is stored.

     * Approximation and loss of alpha or color components

     * can result, depending on the colors in the

     * <code>IndexColorModel</code> colormap.

     */

    public static final int TYPE_BYTE_INDEXED = 13;

    private static final int DCM_RED_MASK   = 0x00ff0000;

    private static final int DCM_GREEN_MASK = 0x0000ff00;

    private static final int DCM_BLUE_MASK  = 0x000000ff;

    private static final int DCM_ALPHA_MASK = 0xff000000;

    private static final int DCM_565_RED_MASK = 0xf800;

    private static final int DCM_565_GRN_MASK = 0x07E0;

    private static final int DCM_565_BLU_MASK = 0x001F;

    private static final int DCM_555_RED_MASK = 0x7C00;

    private static final int DCM_555_GRN_MASK = 0x03E0;

    private static final int DCM_555_BLU_MASK = 0x001F;

    private static final int DCM_BGR_RED_MASK = 0x0000ff;

    private static final int DCM_BGR_GRN_MASK = 0x00ff00;

    private static final int DCM_BGR_BLU_MASK = 0xff0000;

    static private native void initIDs();

    static {

        ColorModel.loadLibraries();

        initIDs();

    }

    /**

     * Constructs a <code>BufferedImage</code> of one of the predefined

     * image types.  The <code>ColorSpace</code> for the image is the

     * default sRGB space.

     * @param width     width of the created image

     * @param height    height of the created image

     * @param imageType type of the created image

     * @see ColorSpace

     * @see #TYPE_INT_RGB

     * @see #TYPE_INT_ARGB

     * @see #TYPE_INT_ARGB_PRE

     * @see #TYPE_INT_BGR

     * @see #TYPE_3BYTE_BGR

     * @see #TYPE_4BYTE_ABGR

     * @see #TYPE_4BYTE_ABGR_PRE

     * @see #TYPE_BYTE_GRAY

     * @see #TYPE_USHORT_GRAY

     * @see #TYPE_BYTE_BINARY

     * @see #TYPE_BYTE_INDEXED

     * @see #TYPE_USHORT_565_RGB

     * @see #TYPE_USHORT_555_RGB

     */

    public BufferedImage(int width,

                         int height,

                         int imageType) {

        switch (imageType) {

        case TYPE_INT_RGB:

            {

                colorModel = new DirectColorModel(24,

                                                  0x00ff0000,   // Red

                                                  0x0000ff00,   // Green

                                                  0x000000ff,   // Blue

                                                  0x0           // Alpha

                                                  );

                  raster = colorModel.createCompatibleWritableRaster(width,

                                                                      height);

            }

        break;

        case TYPE_INT_ARGB:

            {

                colorModel = ColorModel.getRGBdefault();

                raster = colorModel.createCompatibleWritableRaster(width,

                                                                   height);

            }

        break;

        case TYPE_INT_ARGB_PRE:

            {

                colorModel = new

                    DirectColorModel(

                                     ColorSpace.getInstance(ColorSpace.CS_sRGB),

                                     32,

                                     0x00ff0000,// Red

                                     0x0000ff00,// Green

                                     0x000000ff,// Blue

                                     0xff000000,// Alpha

                                     true,       // Alpha Premultiplied

                                     DataBuffer.TYPE_INT

                                     );

                  raster = colorModel.createCompatibleWritableRaster(width,

                                                                      height);

            }

        break;

        case TYPE_INT_BGR:

            {

                colorModel = new DirectColorModel(24,

                                                  0x000000ff,   // Red

                                                  0x0000ff00,   // Green

                                                  0x00ff0000    // Blue

                                                  );

                  raster = colorModel.createCompatibleWritableRaster(width,

                                                                      height);

            }

        break;

        case TYPE_3BYTE_BGR:

            {

                ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);

                int[] nBits = {8, 8, 8};

                int[] bOffs = {2, 1, 0};

                colorModel = new ComponentColorModel(cs, nBits, false, false,

                                                     Transparency.OPAQUE,

                                                     DataBuffer.TYPE_BYTE);

                raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE,

                                                        width, height,

                                                        width*3, 3,

                                                        bOffs, null);

            }

        break;

        case TYPE_4BYTE_ABGR:

            {

                ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);

                int[] nBits = {8, 8, 8, 8};

                int[] bOffs = {3, 2, 1, 0};

                colorModel = new ComponentColorModel(cs, nBits, true, false,

                                                     Transparency.TRANSLUCENT,

                                                     DataBuffer.TYPE_BYTE);

                raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE,

                                                        width, height,

                                                        width*4, 4,

                                                        bOffs, null);

            }

        break;

        case TYPE_4BYTE_ABGR_PRE:

            {

                ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);

                int[] nBits = {8, 8, 8, 8};

                int[] bOffs = {3, 2, 1, 0};

                colorModel = new ComponentColorModel(cs, nBits, true, true,

                                                     Transparency.TRANSLUCENT,

                                                     DataBuffer.TYPE_BYTE);

                raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE,

                                                        width, height,

                                                        width*4, 4,

                                                        bOffs, null);

            }

        break;

        case TYPE_BYTE_GRAY:

            {

                ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);

                int[] nBits = {8};

                colorModel = new ComponentColorModel(cs, nBits, false, true,

                                                     Transparency.OPAQUE,

                                                     DataBuffer.TYPE_BYTE);

                raster = colorModel.createCompatibleWritableRaster(width,

                                                                   height);

            }

        break;

        case TYPE_USHORT_GRAY:

            {

                ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);

                int[] nBits = {16};

                colorModel = new ComponentColorModel(cs, nBits, false, true,

                                                     Transparency.OPAQUE,

                                                     DataBuffer.TYPE_USHORT);

                raster = colorModel.createCompatibleWritableRaster(width,

                                                                   height);

            }

        break;

        case TYPE_BYTE_BINARY:

            {

                byte[] arr = {(byte)0, (byte)0xff};

                colorModel = new IndexColorModel(1, 2, arr, arr, arr);

                raster = Raster.createPackedRaster(DataBuffer.TYPE_BYTE,

                                                   width, height, 1, 1, null);

            }

        break;

        case TYPE_BYTE_INDEXED:

            {

                // Create a 6x6x6 color cube

                int[] cmap = new int[256];

                int i=0;

                for (int r=0; r < 256; r += 51) {

                    for (int g=0; g < 256; g += 51) {

                        for (int b=0; b < 256; b += 51) {

                            cmap[i++] = (r<<16)|(g<<8)|b;

                        }

                    }

                }

                // And populate the rest of the cmap with gray values

                int grayIncr = 256/(256-i);

                // The gray ramp will be between 18 and 252

                int gray = grayIncr*3;

                for (; i < 256; i++) {

                    cmap[i] = (gray<<16)|(gray<<8)|gray;

                    gray += grayIncr;

                }

                colorModel = new IndexColorModel(8, 256, cmap, 0, false, -1,

                                                 DataBuffer.TYPE_BYTE);

                raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE,

                                                      width, height, 1, null);

            }

        break;

        case TYPE_USHORT_565_RGB:

            {

                colorModel = new DirectColorModel(16,

                                                  DCM_565_RED_MASK,

                                                  DCM_565_GRN_MASK,

                                                  DCM_565_BLU_MASK

                                                  );

                raster = colorModel.createCompatibleWritableRaster(width,

                                                                   height);

            }

            break;

        case TYPE_USHORT_555_RGB:

            {

                colorModel = new DirectColorModel(15,

                                                  DCM_555_RED_MASK,

                                                  DCM_555_GRN_MASK,

                                                  DCM_555_BLU_MASK

                                                  );

                raster = colorModel.createCompatibleWritableRaster(width,

                                                                   height);

            }

            break;

        default:

            throw new IllegalArgumentException ("Unknown image type " +

                                                imageType);

        }

        this.imageType = imageType;

    }

    /**

     * Constructs a <code>BufferedImage</code> of one of the predefined

     * image types:

     * TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED.

     *

     * <p> If the image type is TYPE_BYTE_BINARY, the number of

     * entries in the color model is used to determine whether the

     * image should have 1, 2, or 4 bits per pixel.  If the color model

     * has 1 or 2 entries, the image will have 1 bit per pixel.  If it

     * has 3 or 4 entries, the image with have 2 bits per pixel.  If

     * it has between 5 and 16 entries, the image will have 4 bits per

     * pixel.  Otherwise, an IllegalArgumentException will be thrown.

     *

     * @param width     width of the created image

     * @param height    height of the created image