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/* ImageObserver.java -- Java interface for asynchronous updates to an image
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath 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 for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
As a special exception, if you link this library with other files to
produce an executable, this library does not by itself cause the
resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the
executable file might be covered by the GNU General Public License. */
package java.awt.image;
import java.awt.Image;
/**
* An object implementing the <code>ImageObserver</code> interface can
* receive updates on image construction from an
* <code>ImageProducer</code> asynchronously.
*
* @see ImageProducer
* @author C. Brian Jones (cbj@gnu.org)
*/
public interface ImageObserver
{
/**
* The width of the image has been provided as the
* <code>width</code> argument to <code>imageUpdate</code>.
*
* @see #imageUpdate
*/
public static final int WIDTH = 1;
/**
* The height of the image has been provided as the
* <code>height</code> argument to <code>imageUpdate</code>.
*
* @see #imageUpdate
*/
public static final int HEIGHT = 2;
/**
* The properties of the image have been provided.
*
* @see #imageUpdate
* @see java.awt.Image#getProperty (java.lang.String, java.awt.image.ImageObserver)
*/
public static final int PROPERTIES = 4;
/**
* More pixels are now available for drawing a scaled variation of
* the image.
*
* @see #imageUpdate
*/
public static final int SOMEBITS = 8;
/**
* All the pixels needed to draw a complete frame of a multi-frame
* image are available.
*
* @see #imageUpdate
*/
public static final int FRAMEBITS = 16;
/**
* An image with a single frame, a static image, is complete.
*
* @see #imageUpdate
*/
public static final int ALLBITS = 32;
/**
* An error was encountered while producing the image.
*
* @see #imageUpdate
*/
public static final int ERROR = 64;
/**
* Production of the image was aborted.
*
* @see #imageUpdate
*/
public static final int ABORT = 128;
/**
* This is a callback method for an asynchronous image producer to
* provide updates on the production of the image as it happens.
*
* @param image the image the update refers to
* @param flags a bit mask indicating what is provided with this update
* @param x the x coordinate of the image
* @param y the y coordinate of the image
* @param width the width of the image
* @param height the height of the image
*
* @see java.awt.Image
*/
public abstract boolean imageUpdate(Image image, int flags, int x,
int y, int width, int height);
}
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