Source for gnu.javax.imageio.bmp.BMPEncoder

   1: /* BMPEncoder.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.io.IOException;
  42: 
  43: import javax.imageio.IIOImage;
  44: import javax.imageio.ImageWriteParam;
  45: import javax.imageio.metadata.IIOMetadata;
  46: import javax.imageio.stream.ImageOutputStream;
  47: 
  48: public abstract class BMPEncoder
  49: {
  50: 
  51:   /**
  52:    * Constructs a new BMPEncoder.
  53:    */
  54:   public BMPEncoder()
  55:   {
  56:     // Nothing to do here.
  57:   }
  58: 
  59:   /**
  60:    * Determines the coding type of the bitmap and returns the corresponding
  61:    * encoder.
  62:    *
  63:    * @param fh - the file header
  64:    * @param ih - the info header
  65:    * @return the appropriate encoder
  66:    */
  67:   public static BMPEncoder getEncoder(BMPFileHeader fh, BMPInfoHeader ih)
  68:   {
  69:     switch (ih.getCompression())
  70:       {
  71:         case BMPInfoHeader.BI_RGB:
  72:         switch (ih.getBitCount())
  73:           {
  74:           case 32:
  75:             return new EncodeRGB32(fh, ih);
  76: 
  77:           case 24:
  78:             return new EncodeRGB24(fh, ih);
  79: 
  80:           case 16:
  81:             return new EncodeRGB16(fh, ih);
  82: 
  83:           case 8:
  84:             return new EncodeRGB8(fh, ih);
  85: 
  86:           case 4:
  87:             return new EncodeRGB4(fh, ih);
  88: 
  89:           case 1:
  90:             return new EncodeRGB1(fh, ih);
  91: 
  92:           default:
  93:             return null;
  94:           }
  95:       case BMPInfoHeader.BI_RLE4:
  96:         return new EncodeRLE4(fh, ih);
  97: 
  98:       case BMPInfoHeader.BI_RLE8:
  99:         return new EncodeRLE8(fh, ih);
 100:       default:
 101:         return null;
 102:       }
 103:   }
 104: 
 105:   /**
 106:    * The image encoder.
 107:    *
 108:    * @param o - the image output stream
 109:    * @param streamMetadata - metadata associated with this stream, or
 110:    * null
 111:    * @param image - an IIOImage containing image data, metadata and
 112:    * thumbnails to be written
 113:    * @param param - image writing parameters, or null
 114:    * @exception IOException if a write error occurs
 115:    */
 116:   public abstract void encode(ImageOutputStream o, IIOMetadata streamMetadata,
 117:                               IIOImage image, ImageWriteParam param)
 118:       throws IOException;
 119: }