Source for gnu.java.awt.color.ClutProfileConverter

   1: /* ClutProfileConverter.java -- Conversion routines for CLUT-Based profiles
   2:    Copyright (C) 2004 Free Software Foundation
   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: package gnu.java.awt.color;
  39: 
  40: import java.awt.color.ICC_Profile;
  41: 
  42: 
  43: /**
  44:  * ClutProfileConverter - conversions through a CLUT-based profile
  45:  *
  46:  * @author Sven de Marothy
  47:  */
  48: public class ClutProfileConverter implements ColorSpaceConverter
  49: {
  50:   private ColorLookUpTable toPCS;
  51:   private ColorLookUpTable fromPCS;
  52:   private int nChannels;
  53: 
  54:   public ClutProfileConverter(ICC_Profile profile)
  55:   {
  56:     nChannels = profile.getNumComponents();
  57: 
  58:     // Sun does not specifiy which rendering intent should be used,
  59:     // neither does the ICC v2 spec really.
  60:     // Try intent 0
  61:     try
  62:       {
  63:         toPCS = new ColorLookUpTable(profile, ICC_Profile.icSigAToB0Tag);
  64:       }
  65:     catch (Exception e)
  66:       {
  67:         toPCS = null;
  68:       }
  69: 
  70:     try
  71:       {
  72:         fromPCS = new ColorLookUpTable(profile, ICC_Profile.icSigBToA0Tag);
  73:       }
  74:     catch (Exception e)
  75:       {
  76:         fromPCS = null;
  77:       }
  78: 
  79:     if (toPCS != null || fromPCS != null)
  80:       return;
  81: 
  82:     // If no intent 0 clut is available, look for a intent 1 clut.
  83:     try
  84:       {
  85:         toPCS = new ColorLookUpTable(profile, ICC_Profile.icSigAToB1Tag);
  86:       }
  87:     catch (Exception e)
  88:       {
  89:         toPCS = null;
  90:       }
  91: 
  92:     try
  93:       {
  94:         fromPCS = new ColorLookUpTable(profile, ICC_Profile.icSigBToA1Tag);
  95:       }
  96:     catch (Exception e)
  97:       {
  98:         fromPCS = null;
  99:       }
 100: 
 101:     if (toPCS != null || fromPCS != null)
 102:       return;
 103: 
 104:     // Last shot.. intent 2 CLUT.
 105:     try
 106:       {
 107:         toPCS = new ColorLookUpTable(profile, ICC_Profile.icSigAToB2Tag);
 108:       }
 109:     catch (Exception e)
 110:       {
 111:         toPCS = null;
 112:       }
 113: 
 114:     try
 115:       {
 116:         fromPCS = new ColorLookUpTable(profile, ICC_Profile.icSigBToA2Tag);
 117:       }
 118:     catch (Exception e)
 119:       {
 120:         fromPCS = null;
 121:       }
 122: 
 123:     if (toPCS == null && fromPCS == null)
 124:       throw new IllegalArgumentException("No CLUTs in profile!");
 125:   }
 126: 
 127:   public float[] toCIEXYZ(float[] in)
 128:   {
 129:     if (toPCS != null)
 130:       return toPCS.lookup(in);
 131:     else
 132:       return new float[3];
 133:   }
 134: 
 135:   public float[] toRGB(float[] in)
 136:   {
 137:     return SrgbConverter.XYZtoRGB(toCIEXYZ(in));
 138:   }
 139: 
 140:   public float[] fromCIEXYZ(float[] in)
 141:   {
 142:     if (fromPCS != null)
 143:       return fromPCS.lookup(in);
 144:     else
 145:       return new float[nChannels];
 146:   }
 147: 
 148:   public float[] fromRGB(float[] in)
 149:   {
 150:     return fromCIEXYZ(SrgbConverter.RGBtoXYZ(in));
 151:   }
 152: }