graymask.java

Vyger offers a D & D and Rogue-like environment in a graphical online roleplay game.

/*
 * Light And Shadow. A Persistent Universe based on Robert Jordan's Wheel of Time Books.
 * Copyright (C) 2001-2002 WOTLAS Team
 *
 * This program 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
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package wotlas.libs.graphics2D;

import java.awt.MediaTracker;
import java.awt.Image;
import java.awt.image.BufferedImage;


/** A small utility to create a mask from an grayscale image<br>
 * -128 => white<br>
 *  127 => black<br>
 *    0 => do nothing
 *
 * @author Petrus
 */
public class GrayMask
{

 /*------------------------------------------------------------------------------------*/

  /** To create a mask
   * 
   * @param buffImg a buffered image
   * @return the created mask
   */
  static public byte[][] create(BufferedImage buffImg) {
    int imgWidth = buffImg.getWidth();
    int imgHeight = buffImg.getHeight();
    byte[][] mask = new byte[imgWidth][imgHeight];

    for (int j=0; j<imgHeight; j++) {
      for (int i=0; i<imgWidth; i++) {
        mask[i][j] = (byte) ((buffImg.getRGB(i, j) & 0xff)-128); // Get the blue color
      }      
    }
    return mask;
  }
 
 /*------------------------------------------------------------------------------------*/
  
  /** To create a mask
   *
   * @param path image path
   * @return the created mask
   *
  static public byte[][] create(String path) {
    BufferedImage maskBuffImg = ImageLibrary.loadBufferedImage(path);
    return create(maskBuffImg);
  } 

 /*------------------------------------------------------------------------------------*/
   
}