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Tom Tromey
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373
libjava/classpath/java/awt/image/MemoryImageSource.java
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373
libjava/classpath/java/awt/image/MemoryImageSource.java
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/* MemoryImageSource.java -- Java class for providing image data
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Copyright (C) 1999, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.image;
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import java.util.Hashtable;
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import java.util.Vector;
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public class MemoryImageSource implements ImageProducer
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{
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private boolean animated = false;
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private boolean fullbuffers = false;
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private int[] pixeli;
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private int width;
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private int height;
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private int offset;
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private int scansize;
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private byte[] pixelb;
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private ColorModel cm;
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private Hashtable props = new Hashtable();
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private Vector consumers = new Vector();
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/**
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* Construct an image producer that reads image data from a byte
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* array.
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*
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* @param w width of image
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* @param h height of image
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* @param cm the color model used to represent pixel values
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* @param pix a byte array of pixel values
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* @param off the offset into the array at which the first pixel is stored
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* @param scan the number of array elements that represents a single pixel row
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*/
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public MemoryImageSource(int w, int h, ColorModel cm, byte[] pix, int off,
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int scan)
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{
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this(w, h, cm, pix, off, scan, null);
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}
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/**
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* Constructs an ImageProducer from memory
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*/
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public MemoryImageSource(int w, int h, ColorModel cm, byte[] pix, int off,
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int scan, Hashtable props)
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{
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width = w;
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height = h;
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this.cm = cm;
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offset = off;
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scansize = scan;
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this.props = props;
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int max = ((scansize > width) ? scansize : width);
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pixelb = pix;
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}
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/**
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* Construct an image producer that reads image data from an
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* integer array.
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*
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* @param w width of image
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* @param h height of image
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* @param cm the color model used to represent pixel values
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* @param pix an integer array of pixel values
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* @param off the offset into the array at which the first pixel is stored
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* @param scan the number of array elements that represents a single pixel row
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*/
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public MemoryImageSource(int w, int h, ColorModel cm, int[] pix, int off,
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int scan)
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{
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this(w, h, cm, pix, off, scan, null);
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}
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/**
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Constructs an ImageProducer from memory
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*/
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public MemoryImageSource(int w, int h, ColorModel cm, int[] pix, int off,
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int scan, Hashtable props)
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{
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width = w;
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height = h;
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this.cm = cm;
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offset = off;
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scansize = scan;
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this.props = props;
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int max = ((scansize > width) ? scansize : width);
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pixeli = pix;
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}
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/**
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* Constructs an ImageProducer from memory using the default RGB ColorModel
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*/
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public MemoryImageSource(int w, int h, int[] pix, int off, int scan,
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Hashtable props)
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{
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this(w, h, ColorModel.getRGBdefault(), pix, off, scan, props);
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}
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/**
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* Constructs an ImageProducer from memory using the default RGB ColorModel
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*/
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public MemoryImageSource(int w, int h, int[] pix, int off, int scan)
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{
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this(w, h, ColorModel.getRGBdefault(), pix, off, scan, null);
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}
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/**
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* Used to register an <code>ImageConsumer</code> with this
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* <code>ImageProducer</code>.
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*/
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public synchronized void addConsumer(ImageConsumer ic)
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{
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if (consumers.contains(ic))
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return;
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consumers.addElement(ic);
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}
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/**
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* Used to determine if the given <code>ImageConsumer</code> is
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* already registered with this <code>ImageProducer</code>.
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*/
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public synchronized boolean isConsumer(ImageConsumer ic)
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{
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if (consumers.contains(ic))
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return true;
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return false;
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}
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/**
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* Used to remove an <code>ImageConsumer</code> from the list of
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* registered consumers for this <code>ImageProducer</code>.
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*/
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public synchronized void removeConsumer(ImageConsumer ic)
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{
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consumers.removeElement(ic);
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}
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/**
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* Used to register an <code>ImageConsumer</code> with this
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* <code>ImageProducer</code> and then immediately start
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* reconstruction of the image data to be delivered to all
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* registered consumers.
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*/
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public void startProduction(ImageConsumer ic)
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{
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if (! (consumers.contains(ic)))
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consumers.addElement(ic);
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Vector list = (Vector) consumers.clone();
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for (int i = 0; i < list.size(); i++)
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{
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ic = (ImageConsumer) list.elementAt(i);
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sendPicture(ic);
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if (animated)
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ic.imageComplete(ImageConsumer.SINGLEFRAME);
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else
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ic.imageComplete(ImageConsumer.STATICIMAGEDONE);
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}
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}
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/**
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* Used to register an <code>ImageConsumer</code> with this
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* <code>ImageProducer</code> and then request that this producer
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* resend the image data in the order top-down, left-right.
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*/
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public void requestTopDownLeftRightResend(ImageConsumer ic)
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{
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startProduction(ic);
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}
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/**
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* Changes a flag to indicate whether this MemoryImageSource supports
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* animations.
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*
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* @param animated A flag indicating whether this class supports animations
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*/
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public synchronized void setAnimated(boolean animated)
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{
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this.animated = animated;
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}
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/**
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* A flag to indicate whether or not to send full buffer updates when
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* sending animation. If this flag is set then full buffers are sent
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* in the newPixels methods instead of just regions.
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*
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* @param fullbuffers - a flag indicating whether to send the full buffers
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*/
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public synchronized void setFullBufferUpdates(boolean fullbuffers)
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{
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this.fullbuffers = fullbuffers;
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}
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/**
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* Send an animation frame to the image consumers.
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*/
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public void newPixels()
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{
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if (animated == true)
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{
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ImageConsumer ic;
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Vector list = (Vector) consumers.clone();
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for (int i = 0; i < list.size(); i++)
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{
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ic = (ImageConsumer) list.elementAt(i);
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sendPicture(ic);
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ic.imageComplete(ImageConsumer.SINGLEFRAME);
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}
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}
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}
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private void sendPicture(ImageConsumer ic)
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{
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ic.setHints(ImageConsumer.TOPDOWNLEFTRIGHT);
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if (props != null)
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ic.setProperties(props);
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ic.setDimensions(width, height);
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ic.setColorModel(cm);
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if (pixeli != null)
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ic.setPixels(0, 0, width, height, cm, pixeli, offset, scansize);
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else
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ic.setPixels(0, 0, width, height, cm, pixelb, offset, scansize);
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}
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/**
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* Send an animation frame to the image consumers containing the specified
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* pixels unless setFullBufferUpdates is set.
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*/
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public synchronized void newPixels(int x, int y, int w, int h)
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{
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if (animated == true)
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{
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if (fullbuffers)
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newPixels();
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else
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{
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ImageConsumer ic;
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Vector list = (Vector) consumers.clone();
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for (int i = 0; i < list.size(); i++)
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{
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ic = (ImageConsumer) list.elementAt(i);
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ic.setHints(ImageConsumer.TOPDOWNLEFTRIGHT);
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if (props != null)
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ic.setProperties(props);
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if (pixeli != null)
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{
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int[] pixelbuf = new int[w * h];
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for (int row = y; row < y + h; row++)
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System.arraycopy(pixeli, row * scansize + x + offset,
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pixelbuf, 0, w * h);
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ic.setPixels(x, y, w, h, cm, pixelbuf, 0, w);
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}
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else
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{
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byte[] pixelbuf = new byte[w * h];
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for (int row = y; row < y + h; row++)
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System.arraycopy(pixelb, row * scansize + x + offset,
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pixelbuf, 0, w * h);
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ic.setPixels(x, y, w, h, cm, pixelbuf, 0, w);
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}
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ic.imageComplete(ImageConsumer.SINGLEFRAME);
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}
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}
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}
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}
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/**
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* Send an animation frame to the image consumers containing the specified
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* pixels unless setFullBufferUpdates is set.
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*
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* If framenotify is set then a notification is sent when the frame
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* is sent otherwise no status is sent.
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*/
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public synchronized void newPixels(int x, int y, int w, int h,
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boolean framenotify)
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{
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if (animated == true)
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{
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if (fullbuffers)
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newPixels();
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else
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{
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ImageConsumer ic;
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Vector list = (Vector) consumers.clone();
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for (int i = 0; i < list.size(); i++)
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{
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ic = (ImageConsumer) list.elementAt(i);
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ic.setHints(ImageConsumer.TOPDOWNLEFTRIGHT);
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if (props != null)
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ic.setProperties(props);
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if (pixeli != null)
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{
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int[] pixelbuf = new int[w * h];
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for (int row = y; row < y + h; row++)
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System.arraycopy(pixeli, row * scansize + x + offset,
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pixelbuf, 0, w * h);
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ic.setPixels(x, y, w, h, cm, pixelbuf, 0, w);
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}
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else
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{
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byte[] pixelbuf = new byte[w * h];
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for (int row = y; row < y + h; row++)
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System.arraycopy(pixelb, row * scansize + x + offset,
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pixelbuf, 0, w * h);
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ic.setPixels(x, y, w, h, cm, pixelbuf, 0, w);
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}
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if (framenotify == true)
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ic.imageComplete(ImageConsumer.SINGLEFRAME);
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}
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}
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}
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}
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public synchronized void newPixels(byte[] newpix, ColorModel newmodel,
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int offset, int scansize)
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{
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pixeli = null;
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pixelb = newpix;
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cm = newmodel;
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this.offset = offset;
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this.scansize = scansize;
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if (animated == true)
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newPixels();
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}
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public synchronized void newPixels(int[] newpix, ColorModel newmodel,
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int offset, int scansize)
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{
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pixelb = null;
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pixeli = newpix;
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cm = newmodel;
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this.offset = offset;
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this.scansize = scansize;
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if (animated == true)
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newPixels();
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}
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}
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