JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1995, 2004, 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.awt.image;

import java.util.Hashtable;
import java.util.Enumeration;

import java.awt.Component;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ImageProducer;
import java.awt.image.ImageConsumer;
import java.awt.image.ImageObserver;
import sun.awt.image.ImageRepresentation;
import sun.awt.image.FileImageSource;

public class ToolkitImage extends Image {

    /**
     * The object which is used to reconstruct the original image data
     * as needed.
     */
    ImageProducer source;

    InputStreamImageSource src;

    ImageRepresentation imagerep;

    static {
        /* ensure that the necessary native libraries are loaded */
        NativeLibLoader.loadLibraries();
    }

    protected ToolkitImage() {
    }

    /**
     * Construct an image from an ImageProducer object.
     */
    public ToolkitImage(ImageProducer is) {
        source = is;
        if (is instanceof InputStreamImageSource) {
            src = (InputStreamImageSource) is;
        }
    }

    public ImageProducer getSource() {
        if (src != null) {
            src.checkSecurity(null, false);
        }
        return source;
    }

    private int width = -1;
    private int height = -1;
    private Hashtable properties;

    private int availinfo;

    /**
     * Return the width of the original image source.
     * If the width isn't known, then the image is reconstructed.
     */
    public int getWidth() {
        if (src != null) {
            src.checkSecurity(null, false);
        }
        if ((availinfo & ImageObserver.WIDTH) == 0) {
            reconstruct(ImageObserver.WIDTH);
        }
        return width;
    }

    /**
     * Return the width of the original image source.
     * If the width isn't known, then the ImageObserver object will be
     * notified when the data is available.
     */
    public synchronized int getWidth(ImageObserver iw) {
        if (src != null) {
            src.checkSecurity(null, false);
        }
        if ((availinfo & ImageObserver.WIDTH) == 0) {
            addWatcher(iw, true);
            if ((availinfo & ImageObserver.WIDTH) == 0) {
                return -1;
            }
        }
        return width;
    }

    /**
     * Return the height of the original image source.
     * If the height isn't known, then the image is reconstructed.
     */
    public int getHeight() {
        if (src != null) {
            src.checkSecurity(null, false);
        }
        if ((availinfo & ImageObserver.HEIGHT) == 0) {
            reconstruct(ImageObserver.HEIGHT);
        }
        return height;
    }

    /**
     * Return the height of the original image source.
     * If the height isn't known, then the ImageObserver object will be
     * notified when the data is available.
     */
    public synchronized int getHeight(ImageObserver iw) {
        if (src != null) {
            src.checkSecurity(null, false);
        }
        if ((availinfo & ImageObserver.HEIGHT) == 0) {
            addWatcher(iw, true);
            if ((availinfo & ImageObserver.HEIGHT) == 0) {
                return -1;
            }
        }
        return height;
    }

    /**
     * Return a property of the image by name.  Individual property names
     * are defined by the various image formats.  If a property is not
     * defined for a particular image, then this method will return the
     * UndefinedProperty object.  If the properties for this image are
     * not yet known, then this method will return null and the ImageObserver
     * object will be notified later.  The property name "comment" should
     * be used to store an optional comment which can be presented to
     * the user as a description of the image, its source, or its author.
     */
    public Object getProperty(String name, ImageObserver observer) {
        if (name == null) {
            throw new NullPointerException("null property name is not allowed");
        }

        if (src != null) {
            src.checkSecurity(null, false);
        }
        if (properties == null) {
            addWatcher(observer, true);
            if (properties == null) {
                return null;
            }
        }
        Object o = properties.get(name);
        if (o == null) {
            o = Image.UndefinedProperty;
        }
        return o;
    }

    public boolean hasError() {
        if (src != null) {
            src.checkSecurity(null, false);
        }
        return (availinfo & ImageObserver.ERROR) != 0;
    }

    public int check(ImageObserver iw) {
        if (src != null) {
            src.checkSecurity(null, false);
        }
        if ((availinfo & ImageObserver.ERROR) == 0 &&
            ((~availinfo) & (ImageObserver.WIDTH |
                             ImageObserver.HEIGHT |
                             ImageObserver.PROPERTIES)) != 0) {
            addWatcher(iw, false);
        }
        return availinfo;
    }

    public void preload(ImageObserver iw) {
        if (src != null) {
            src.checkSecurity(null, false);
        }
        if ((availinfo & ImageObserver.ALLBITS) == 0) {
            addWatcher(iw, true);
        }
    }

    private synchronized void addWatcher(ImageObserver iw, boolean load) {
        if ((availinfo & ImageObserver.ERROR) != 0) {
            if (iw != null) {
                iw.imageUpdate(this, ImageObserver.ERROR|ImageObserver.ABORT,
                               -1, -1, -1, -1);
            }
            return;
        }
        ImageRepresentation ir = getImageRep();
        ir.addWatcher(iw);
        if (load) {
            ir.startProduction();
        }
    }

    private synchronized void reconstruct(int flags) {
        if ((flags & ~availinfo) != 0) {
            if ((availinfo & ImageObserver.ERROR) != 0) {
                return;
            }
            ImageRepresentation ir = getImageRep();
            ir.startProduction();
            while ((flags & ~availinfo) != 0) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                    return;
                }
                if ((availinfo & ImageObserver.ERROR) != 0) {
                    return;
                }
            }
        }
    }

    synchronized void addInfo(int newinfo) {
        availinfo |= newinfo;
        notifyAll();
    }

    void setDimensions(int w, int h) {
        width = w;
        height = h;
        addInfo(ImageObserver.WIDTH | ImageObserver.HEIGHT);
    }

    void setProperties(Hashtable props) {
        if (props == null) {
            props = new Hashtable();
        }
        properties = props;
        addInfo(ImageObserver.PROPERTIES);
    }

    synchronized void infoDone(int status) {
        if (status == ImageConsumer.IMAGEERROR ||
            ((~availinfo) & (ImageObserver.WIDTH |
                             ImageObserver.HEIGHT)) != 0) {
            addInfo(ImageObserver.ERROR);
        } else if ((availinfo & ImageObserver.PROPERTIES) == 0) {
            setProperties(null);
        }
    }

    public void flush() {
        if (src != null) {
            src.checkSecurity(null, false);
        }

        ImageRepresentation ir;
        synchronized (this) {
            availinfo &= ~ImageObserver.ERROR;
            ir = imagerep;
            imagerep = null;
        }
        if (ir != null) {
            ir.abort();
        }
        if (src != null) {
            src.flush();
        }
    }

    protected ImageRepresentation makeImageRep() {
        return new ImageRepresentation(this, ColorModel.getRGBdefault(),
                                       false);
    }

    public synchronized ImageRepresentation getImageRep() {

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