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347 lines
9.6 KiB
Java
347 lines
9.6 KiB
Java
/* PixelGrabber.java -- Java class for providing image data
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Copyright (C) 1999 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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.awt.Image;
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import java.util.Hashtable;
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/**
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PixelGrabber is an ImageConsumer designed to extract a rectangular region of pixels
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from an Image
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*/
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public class PixelGrabber implements ImageConsumer
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{
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int x, y, width, height, status, scansize, offset;
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ColorModel model = ColorModel.getRGBdefault();
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//int hints;
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//Hashtable props;
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int pixel_bufferi[];
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byte pixel_bufferb[];
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boolean grabbing;
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ImageProducer ip;
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/**
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* Create a PixelGrabber used to grab pixels from the specified Image
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* in the specified rectangle
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*
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* @param img the Image to grab pixels from
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* @param x the x coordinate of the rectangle
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* @param y the y coordinate of the rectangle
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* @param w the width of the rectangle
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* @param h the height of the rectangle
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* @param pixels the array of pixel values
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* @param offset the index of the first pixels in the <code>pixels</code> array
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* @param scansize the width to use in extracting pixels from the <code>pixels</code> array
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*/
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public PixelGrabber(Image img, int x, int y, int w, int h,
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int pix[], int off, int scansize)
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{
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this( img.getSource(), x, y, w, h, pix, off, scansize );
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}
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/**
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* Create a PixelGrabber used to grab pixels from the specified ImageProducer
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* in the specified rectangle
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*
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* @param ip the ImageProducer to grab pixels from
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* @param x the x coordinate of the rectangle
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* @param y the y coordinate of the rectangle
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* @param w the width of the rectangle
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* @param h the height of the rectangle
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* @param pixels the array of pixel values
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* @param offset the index of the first pixels in the <code>pixels</code> array
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* @param scansize the width to use in extracting pixels from the <code>pixels</code> array
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*/
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public PixelGrabber(ImageProducer ip, int x, int y, int w, int h,
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int pix[], int off, int scansize)
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{
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this.ip = ip;
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this.x = x;
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this.y = y;
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this.width = w;
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this.height = h;
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this.pixel_bufferi = pix;
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this.offset = off;
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this.scansize = scansize;
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pixel_bufferb = new byte[pix.length * 4];
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}
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/**
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* Create a PixelGrabber used to grab pixels from the specified Image
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* in the specified rectangle
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*
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* @param img the Image to grab pixels from
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* @param x the x coordinate of the rectangle
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* @param y the y coordinate of the rectangle
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* @param w the width of the rectangle
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* @param h the height of the rectangle
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* @param forceRGB true to force conversion to RGB
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*/
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public PixelGrabber(Image img,
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int x, int y,
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int w, int h,
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boolean forceRGB)
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{
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//FIXME
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}
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/**
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Start Grabbing Pixels
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*/
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public synchronized void startGrabbing()
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{
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if ( grabbing == false )
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{
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grabbing = true;
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ip.startProduction( this );
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}
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}
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/**
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Abort the grabbing of pixels
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*/
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public synchronized void abortGrabbing()
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{
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if ( grabbing == true )
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{
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grabbing = false;
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ip.removeConsumer( this );
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}
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}
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/**
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Grab the Pixels.
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@return true if successful
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@throws InterruptedException if interrupted by another thread.
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*/
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public boolean grabPixels() throws InterruptedException
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{
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return grabPixels(0);
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}
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/**
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Grab the Pixels and abort if it takes too long
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@return true if successful
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@throws InterruptedException if interrupted by another thread.
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or time runs out
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*/
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public synchronized boolean grabPixels(long ms) throws InterruptedException
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{
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startGrabbing();
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if (ms < 0)
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return (status == ImageObserver.ALLBITS);
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wait(ms);
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if (status == ImageObserver.ALLBITS)
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return true;
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else
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return false;
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}
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/**
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Get the status of the pixel grabbing representing by ImageObserver flags
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@return the status
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*/
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public synchronized int getStatus()
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{
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return status;
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}
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/**
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Return width of pixel region
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@return width of region
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*/
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public synchronized int getWidth()
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{
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return width;
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}
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/**
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Return height of pixel region
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@return height of region
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*/
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public synchronized int getHeight()
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{
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return height;
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}
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/**
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Returns the grabbed pixel buffer
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@return a byte or int array
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*/
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public synchronized Object getPixels()
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{
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if( pixel_bufferi != null )
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return pixel_bufferi;
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return pixel_bufferb;
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}
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/**
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Get the ColorModel of the image
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@return the ColorModel
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*/
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public synchronized ColorModel getColorModel()
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{
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return model;
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}
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/**
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* An <code>ImageProducer</code> indicates the size of the image
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* being produced using this method.
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*
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* @param width the width of the image
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* @param height the height of the image
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*/
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public void setDimensions(int width, int height)
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{
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}
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/**
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* An <code>ImageProducer</code> can set a list of properties
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* associated with this image by using this method.
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*
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* @param props the list of properties associated with this image
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*/
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public void setProperties(Hashtable props)
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{
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//this.props = props; //FIXME - DO WE NEED THIS
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}
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/**
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* This <code>ColorModel</code> should indicate the model used by
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* the majority of calls to <code>setPixels</code>. Each call to
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* <code>setPixels</code> could however indicate a different
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* <code>ColorModel</code>.
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*
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* @param model the color model to be used most often by setPixels
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* @see ColorModel
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*/
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public void setColorModel(ColorModel model)
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{
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this.model = model;
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}
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/**
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* The <code>ImageProducer</code> should call this method with a
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* bit mask of hints from any of <code>RANDOMPIXELORDER</code>,
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* <code>TOPDOWNLEFTRIGHT</code>, <code>COMPLETESCANLINES</code>,
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* <code>SINGLEPASS</code>, <code>SINGLEFRAME</code>.
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*
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* @param flags a bit mask of hints
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*/
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public void setHints(int flags)
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{
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//hints = flags; // FIXME - DO NOT KNOW WHAT TO DO WITH THE HINTS
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}
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/**
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* This function delivers a rectangle of pixels where any
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* pixel(m,n) is stored in the array as a <code>byte</code> at
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* index (n * scansize + m + offset).
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*/
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public void setPixels(int x, int y, int w, int h,
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ColorModel model, byte[] pixels, int offset, int scansize)
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{
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//FIXME - I hate bytes
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int xp, yp;
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for( xp = x; xp < ( x + w); xp++ )
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for( yp = y; yp < (y + h); yp++ )
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if( xp >= this.x &&
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yp >= this.y &&
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xp <= ( this.x + this.width ) &&
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yp <= ( this.y + this.height ) ) {
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pixel_bufferb[(yp - this.y) * this.scansize + (xp - this.x) + this.offset] =
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pixels[ offset + yp * scansize + xp ];
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}
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}
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/**
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* This function delivers a rectangle of pixels where any
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* pixel(m,n) is stored in the array as an <code>int</code> at
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* index (n * scansize + m + offset).
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*/
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public void setPixels(int x, int y, int w, int h,
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ColorModel model, int[] pixels, int offset, int scansize)
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{
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int xp, yp;
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for( xp = x; xp < ( x + w); xp++ )
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for( yp = y; yp < (y + h); yp++ )
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if( xp >= this.x &&
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yp >= this.y &&
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xp <= ( this.x + this.width ) &&
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yp <= ( this.y + this.height ) ) {
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pixel_bufferi[(yp - this.y) * this.scansize + (xp - this.x) + this.offset] =
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pixels[ offset + yp * scansize + xp ];
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}
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}
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/**
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* The <code>ImageProducer</code> calls this method to indicate a
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* single frame or the entire image is complete. The method is
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* also used to indicate an error in loading or producing the
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* image.
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*/
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public synchronized void imageComplete(int status)
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{
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this.status = status;
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}
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/**
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@deprecated by getStatus
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*/
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public synchronized int status()
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{
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return getStatus();
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}
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}
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