bufferedimage.java

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/*
 * @(#)BufferedImage.java	1.21 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program 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. 
 * 
 * This program 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 at /legal/license.txt). 
 * 
 * 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 or visit www.sun.com if you need additional
 * information or have any questions. 
 *
 */

package java.awt.image;

import java.awt.Toolkit;
import java.util.Hashtable;
import java.util.Vector;
import sun.awt.image.BufferedImagePeer;
import java.awt.GraphicsEnvironment;
import java.awt.Graphics2D;

/**
 *
 * The <code>BufferedImage</code> subclass describes an {@link 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.
 * @see ColorModel
 * @see Raster
 * @see WritableRaster
 * @version 10 Feb 1997
 */

public class BufferedImage extends java.awt.Image //                           implements WritableRenderedImage
{
    //int        imageType = TYPE_CUSTOM;

    /** The peer used to implement BufferedImage. */

    private transient BufferedImagePeer peer;
    // ### Serialization difference
    //  WritableRaster raster;

    // ### Serialization difference
    // 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.
     */
    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 ComponentColorModel}.
     */
    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>.
     */
    //    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>.
     */
    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>.
     */
    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}.
     */
    //    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>.
     */
    //    public static final int TYPE_USHORT_GRAY = 11;

    /**
     * Represents an opaque byte-packed binary 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, an <code>IndexColorModel</code> is created with
     * two colors in the default sRGB <code>ColorSpace</code>:
     * {0,&nbsp;0,&nbsp;0} and {255,&nbsp;255,&nbsp;255}.
     */
    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.
     */
    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;


    /**
     * 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
     */

    /*
     BufferedImage(int width, int height, int imageType) {



     }
     */

    /**
     * Constructs a <code>BufferedImage</code> of one of the predefined
     * image types:
     * TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED
     * @param width     width of the created image
     * @param height    height of the created image
     * @param imageType type of the created image
     * @param cm        <code>IndexColorModel</code> of the created image
     * @throws IllegalArgumentException   if the imageType is not
     * TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED
     * @see #TYPE_BYTE_BINARY
     * @see #TYPE_BYTE_INDEXED
     */

    /*
     public BufferedImage (int width,
     int height,
     int imageType,
     IndexColorModel cm) {
     }
     */

    /**
     * Constructs a new <code>BufferedImage</code> with a specified
     * <code>ColorModel</code> and <code>Raster</code>.  If the number and
     * types of bands in the <code>SampleModel</code> of the
     * <code>Raster</code> do not match the number and types required by
     * the <code>ColorModel</code> to represent its color and alpha
     * components, a {@link RasterFormatException} is thrown.  This
     * method can multiply or divide the color <code>Raster</code> data by
     * alpha to match the <code>alphaPremultiplied</code> state
     * in the <code>ColorModel</code>.  Properties for this
     * <code>BufferedImage</code> can be established by passing
     * in a {@link Hashtable} of <code>String</code>/<code>Object</code>
     * pairs.
     * @param ColorModel <code>ColorModel</code> for the new image
     * @param raster     <code>Raster</code> for the image data
     * @param isRasterPremultiplied   if <code>true</code>, the data in
     *                  the raster has been premultiplied with alpha.
     * @param properties <code>Hashtable</code> of
     *                  <code>String</code>/<code>Object</code> pairs.
     * @exception <code>RasterFormatException</code> if the number and
     * types of bands in the <code>SampleModel</code> of the
     * <code>Raster</code> do not match the number and types required by
     * the <code>ColorModel</code> to represent its color and alpha
     * components.
     * @exception <code>IllegalArgumentException</code> if
     *		<code>raster</code> is incompatible with <code>cm</code>
     * @see ColorModel
     * @see Raster
     * @see WritableRaster
     */


    /*
     *
     *  FOR NOW THE CODE WHICH DEFINES THE RASTER TYPE IS DUPLICATED BY DVF
     *  SEE THE METHOD DEFINERASTERTYPE @ RASTEROUTPUTMANAGER
     *
     */

    /*
     public BufferedImage (ColorModel cm,
     WritableRaster raster,
     boolean isRasterPremultiplied,
     Hashtable properties) {

     }
     */

    /** Constructs a new BufferedImage using <code>peer</code> for delegating its imlementation to.
     This constructor is private to ensure that it is not possible to create BufferedImages using
     constructors in basis or personal profile. It also prevents sub classing of BufferedImage.
     Implementors should implement the BufferedImagePeer interface and call this constructor,
     using JNI for example, from their implementation of <code>GraphicsConfiguration.createCompatiableImage()</code>
     method. */

    private BufferedImage (BufferedImagePeer peer) {
        this.peer = peer;
    }

    /**
     * Returns the image type.  If it is not one of the known types,
     * TYPE_CUSTOM is returned.
     * @return the image type of this <code>BufferedImage</code>.
     * @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_BYTE_BINARY
     * @see #TYPE_BYTE_INDEXED
     * @see #TYPE_USHORT_GRAY
     * @see #TYPE_USHORT_565_RGB
     * @see #TYPE_USHORT_555_RGB
     * @see #TYPE_CUSTOM
     */


    public int getType() {
        return peer.getType();
    }

    /**
     * Returns the <code>ColorModel</code>.
     * @return the <code>ColorModel</code> of this
     *  <code>BufferedImage</code>.