/*

 * Copyright (c) 1995, 2012, 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.

 */

/*-

 *      Reads JPEG images from an InputStream and reports the

 *      image data to an InputStreamImageSource object.

 *

 * The native implementation of the JPEG image decoder was adapted from

 * release 6 of the free JPEG software from the Independent JPEG Group.

 */

package sun.awt.image;

import java.util.Vector;

import java.util.Hashtable;

import java.io.InputStream;

import java.io.IOException;

import java.awt.image.*;

/**

 * JPEG Image converter

 *

 * @author Jim Graham

 */

public class JPEGImageDecoder extends ImageDecoder {

    private static ColorModel RGBcolormodel;

    private static ColorModel ARGBcolormodel;

    private static ColorModel Graycolormodel;

    private static final Class InputStreamClass = InputStream.class;

    private static native void initIDs(Class InputStreamClass);

    private ColorModel colormodel;

    static {

        java.security.AccessController.doPrivileged(

            new java.security.PrivilegedAction<Void>() {

                public Void run() {

                    System.loadLibrary("jpeg");

                    return null;

                }

            });

        initIDs(InputStreamClass);

        RGBcolormodel = new DirectColorModel(24, 0xff0000, 0xff00, 0xff);

        ARGBcolormodel = ColorModel.getRGBdefault();

        byte g[] = new byte[256];

        for (int i = 0; i < 256; i++) {

            g[i] = (byte) i;

        }

        Graycolormodel = new IndexColorModel(8, 256, g, g, g);

    }

    private native void readImage(InputStream is, byte buf[])

        throws ImageFormatException, IOException;

    Hashtable props = new Hashtable();

    public JPEGImageDecoder(InputStreamImageSource src, InputStream is) {

        super(src, is);

    }

    /**

     * An error has occurred. Throw an exception.

     */

    private static void error(String s1) throws ImageFormatException {

        throw new ImageFormatException(s1);

    }

    public boolean sendHeaderInfo(int width, int height,

                                  boolean gray, boolean hasalpha,

                                  boolean multipass)

    {

        setDimensions(width, height);

        setProperties(props);

        if (gray) {

            colormodel = Graycolormodel;

        } else {

            if (hasalpha) {

                colormodel = ARGBcolormodel;

            } else {

                colormodel = RGBcolormodel;

            }

        }

        setColorModel(colormodel);

        int flags = hintflags;

        if (!multipass) {

            flags |= ImageConsumer.SINGLEPASS;

        }

        setHints(hintflags);

        headerComplete();

        return true;

    }

    public boolean sendPixels(int pixels[], int y) {

        int count = setPixels(0, y, pixels.length, 1, colormodel,

                              pixels, 0, pixels.length);

        if (count <= 0) {

            aborted = true;

        }

        return !aborted;

    }

    public boolean sendPixels(byte pixels[], int y) {

        int count = setPixels(0, y, pixels.length, 1, colormodel,

                              pixels, 0, pixels.length);

        if (count <= 0) {

            aborted = true;

        }

        return !aborted;

    }

    /**

     * produce an image from the stream.

     */

    public void produceImage() throws IOException, ImageFormatException {

        try {

            readImage(input, new byte[1024]);

            if (!aborted) {

                imageComplete(ImageConsumer.STATICIMAGEDONE, true);

            }

        } catch (IOException e) {

            if (!aborted) {

                throw e;

            }

        } finally {

            close();

        }

    }

    /**

     * The ImageConsumer hints flag for a JPEG image.

     */

    private static final int hintflags =

        ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES |

        ImageConsumer.SINGLEFRAME;

}