Source for gnu.javax.imageio.bmp.EncodeRGB32

   1: /* EncodeRGB32.java --
   2:    Copyright (C) 2006 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.javax.imageio.bmp;
  40: 
  41: import java.awt.image.BufferedImage;
  42: import java.awt.image.PixelGrabber;
  43: import java.io.IOException;
  44: 
  45: import javax.imageio.IIOImage;
  46: import javax.imageio.ImageWriteParam;
  47: import javax.imageio.metadata.IIOMetadata;
  48: import javax.imageio.stream.ImageOutputStream;
  49: 
  50: public class EncodeRGB32
  51:     extends BMPEncoder
  52: {
  53:   protected BMPInfoHeader infoHeader;
  54:   protected BMPFileHeader fileHeader;
  55:   protected long offset;
  56: 
  57:   /**
  58:    * Constructs an instance of this class.
  59:    *
  60:    * @param fh - the file header to use.
  61:    * @param ih - the info header to use.
  62:    */
  63:   public EncodeRGB32(BMPFileHeader fh, BMPInfoHeader ih)
  64:   {
  65:     super();
  66:     fileHeader = fh;
  67:     infoHeader = ih;
  68:     offset = BMPFileHeader.SIZE + BMPInfoHeader.SIZE;
  69:   }
  70: 
  71:   /**
  72:    * The image encoder.
  73:    *
  74:    * @param o - the image output stream
  75:    * @param streamMetadata - metadata associated with this stream, or null
  76:    * @param image - an IIOImage containing image data.
  77:    * @param param - image writing parameters, or null
  78:    * @exception IOException if a write error occurs
  79:    */
  80:   public void encode(ImageOutputStream o, IIOMetadata streamMetadata,
  81:                      IIOImage image, ImageWriteParam param) throws IOException
  82:   {
  83:     int size;
  84:     int value;
  85:     int j;
  86:     int rowCount;
  87:     int rowIndex;
  88:     int lastRowIndex;
  89:     int[] bitmap;
  90:     byte rgb[] = new byte[4];
  91:     size = (infoHeader.biWidth * infoHeader.biHeight) - 1;
  92:     rowCount = 1;
  93:     rowIndex = size - infoHeader.biWidth;
  94:     lastRowIndex = rowIndex;
  95:     try
  96:       {
  97:         bitmap = new int[infoHeader.biWidth * infoHeader.biHeight];
  98:         PixelGrabber pg = new PixelGrabber((BufferedImage) image.getRenderedImage(),
  99:                                            0, 0, infoHeader.biWidth,
 100:                                            infoHeader.biHeight, bitmap, 0,
 101:                                            infoHeader.biWidth);
 102:         pg.grabPixels();
 103: 
 104:         for (j = 0; j < size; j++)
 105:           {
 106:             value = bitmap[rowIndex];
 107: 
 108:             rgb[0] = (byte) (value & 0xFF);
 109:             rgb[1] = (byte) ((value >> 8) & 0xFF);
 110:             rgb[2] = (byte) ((value >> 16) & 0xFF);
 111:             rgb[3] = (byte) ((value >> 24) & 0xFF);
 112:             o.write(rgb);
 113:             if (rowCount == infoHeader.biWidth)
 114:               {
 115:                 rowCount = 1;
 116:                 rowIndex = lastRowIndex - infoHeader.biWidth;
 117:                 lastRowIndex = rowIndex;
 118:               }
 119:             else
 120:               rowCount++;
 121:             rowIndex++;
 122:           }
 123:       }
 124:     catch (Exception wb)
 125:       {
 126:         wb.printStackTrace();
 127:       }
 128:   }
 129: }