Source for java.awt.image.BufferedImageFilter

   1: /* Copyright (C) 2004  Free Software Foundation
   2: 
   3: This file is part of GNU Classpath.
   4: 
   5: GNU Classpath is free software; you can redistribute it and/or modify
   6: it under the terms of the GNU General Public License as published by
   7: the Free Software Foundation; either version 2, or (at your option)
   8: any later version.
   9: 
  10: GNU Classpath is distributed in the hope that it will be useful, but
  11: WITHOUT ANY WARRANTY; without even the implied warranty of
  12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13: General Public License for more details.
  14: 
  15: You should have received a copy of the GNU General Public License
  16: along with GNU Classpath; see the file COPYING.  If not, write to the
  17: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18: 02110-1301 USA.
  19: 
  20: Linking this library statically or dynamically with other modules is
  21: making a combined work based on this library.  Thus, the terms and
  22: conditions of the GNU General Public License cover the whole
  23: combination.
  24: 
  25: As a special exception, the copyright holders of this library give you
  26: permission to link this library with independent modules to produce an
  27: executable, regardless of the license terms of these independent
  28: modules, and to copy and distribute the resulting executable under
  29: terms of your choice, provided that you also meet, for each linked
  30: independent module, the terms and conditions of the license of that
  31: module.  An independent module is a module which is not derived from
  32: or based on this library.  If you modify this library, you may extend
  33: this exception to your version of the library, but you are not
  34: obligated to do so.  If you do not wish to do so, delete this
  35: exception statement from your version. */
  36: 
  37: package java.awt.image;
  38: 
  39: import java.awt.Point;
  40: 
  41: /**
  42:  * The BufferedImageFilter class wraps BufferedImageOp objects in a Filter.
  43:  * 
  44:  * When pixels are pushed through the filter, we create a BufferedImage,
  45:  * apply the BufferedImageOp, and pass the filtered pixels to the base class.
  46:  * 
  47:  * @author jlquinn@optonline.net
  48:  */
  49: public class BufferedImageFilter extends ImageFilter implements Cloneable
  50: {
  51:   private BufferedImageOp op;
  52: 
  53:   /**
  54:    * 
  55:    */
  56:   public BufferedImageFilter(BufferedImageOp op)
  57:   {
  58:     super();
  59:     if (op == null)
  60:       throw new NullPointerException("BufferedImageFilter null"
  61:                      + " op in constructor");
  62:     this.op = op;
  63:   }
  64:   
  65:   /**
  66:    * @return Returns the contained BufferedImageOp.
  67:    */
  68:   public BufferedImageOp getBufferedImageOp()
  69:   {
  70:     return op;
  71:   }
  72: 
  73:   // FIXME: Definitely not sure this is the right thing.  I'm not sure how to
  74:   // create a compatible sample model that incorporates scansize != w.  I
  75:   // asume off is handled by the db itself.
  76:   public void setPixels(int x, int y, int w, int h, ColorModel model,
  77:             byte[] pixels, int off, int scansize)
  78:   {
  79:     // Create an input BufferedImage
  80:     DataBufferByte db = new DataBufferByte(pixels, scansize * h + off, off);
  81:     SampleModel sm = model.createCompatibleSampleModel(scansize, h);
  82:     WritableRaster wr = new WritableRaster(sm, db, new Point(0, 0));
  83:     BufferedImage in =
  84:       new BufferedImage(model, wr, model.isAlphaPremultiplied(), null);
  85:     BufferedImage out = op.createCompatibleDestImage(in, model);
  86:     op.filter(in, out);
  87:     DataBuffer dbout = out.getRaster().getDataBuffer(); 
  88:     super.setPixels(0, 0, w, h, model, ((DataBufferByte)dbout).getData(), 0,
  89:             scansize);
  90:   }
  91: 
  92:   // FIXME: Definitely not sure this is the right thing.  I'm not sure how
  93:   // to create a compatible sample model that incorporates
  94:   // scansize != w.  I asume off is handled by the db itself.
  95:   public void setPixels(int x, int y, int w, int h, ColorModel model,
  96:             int[] pixels, int off, int scansize)
  97:   {
  98:     // Create an input BufferedImage
  99:     DataBufferInt db = new DataBufferInt(pixels, scansize * h + off, off);
 100:     SampleModel sm = model.createCompatibleSampleModel(scansize, h);
 101:     WritableRaster wr = new WritableRaster(sm, db, new Point(0, 0));
 102:     BufferedImage in =
 103:       new BufferedImage(model, wr, model.isAlphaPremultiplied(), null);
 104:     BufferedImage out = op.createCompatibleDestImage(in, model);
 105:     op.filter(in, out);
 106:     DataBuffer dbout = out.getRaster().getDataBuffer(); 
 107:     super.setPixels(0, 0, w, h, model, ((DataBufferInt)dbout).getData(), 0,
 108:             scansize);
 109:   }
 110: }