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//******************************************************************************
//
// File: GrayBufferedImage.java
// Package: edu.rit.image
// Unit: Class edu.rit.image.GrayBufferedImage
//
// This Java source file is copyright (C) 2007 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ 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 3 of the License, or (at your option) any later version.
//
// PJ 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.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.image;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
/**
* Class GrayBufferedImage provides a grayscale image. The image is layered on
* top of a byte matrix (type <TT>byte[][]</TT>). The height and width of the
* image are equal to the number of rows and columns in the underlying matrix.
* The gray information is stored in a matrix element as a number from 0 (black)
* to 255 (white).
* <P>
* The rows and columns of the underlying matrix need not all be allocated. If
* you get a pixel in an unallocated row or column, a pixel value of 0 (black)
* is returned. If you set a pixel in an unallocated row or column, the pixel
* value is discarded.
* <P>
* Since class GrayBufferedImage is a subclass of class {@linkplain
* java.awt.image.BufferedImage}, you can do all the following with a grayscale
* image just as you would with a BufferedImage: display it on the screen, draw
* into it using a graphics context, copy another grayscale BufferedImage into
* it, read it from or write it to a file using package {@linkplain
* javax.imageio}.
*
* @author Alan Kaminsky
* @version 10-Nov-2007
*/
class GrayBufferedImage
extends BufferedImage
{
// Exported constructors.
/**
* Construct a new grayscale image.
*
* @param theHeight Image height in pixels.
* @param theWidth Image width in pixels.
* @param theMatrix Underlying byte matrix.
*/
public GrayBufferedImage
(int theHeight,
int theWidth,
byte[][] theMatrix)
{
this
(theMatrix,
new ByteGrayColorModel(),
makeRaster (theHeight, theWidth, theMatrix));
}
/**
* Construct a new grayscale image with the given color model and raster.
*
* @param theMatrix Underlying byte matrix.
* @param theColorModel Color model.
* @param theRaster Raster.
*/
private GrayBufferedImage
(byte[][] theMatrix,
ColorModel theColorModel,
WritableRaster theRaster)
{
// Construct superclass BufferedImage.
super
(/*ColorModel cm */ theColorModel,
/*WritableRaster raster */ theRaster,
/*boolean isRasterPremultiplied*/ false,
/*Hashtable<?,?> properties */ null);
}
private static WritableRaster makeRaster
(int theHeight,
int theWidth,
byte[][] theMatrix)
{
return Raster.createWritableRaster
(/*SampleModel sm*/
new SampleModelByteMatrix (theWidth, theHeight),
/*DataBuffer db */
new DataBufferByteMatrix (theMatrix),
/*Point location*/
null);
}
}
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