Source for gnu.javax.imageio.jpeg.JPEGScan

   1: /* JPEGScan.java --
   2:    Copyright (C)  2005  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: package gnu.javax.imageio.jpeg;
  39: 
  40: import java.util.ArrayList;
  41: 
  42: public class JPEGScan
  43: {
  44:   private int maxHeight = 0, maxWidth = 0, maxV = 0, maxH = 0;
  45:   private int numOfComponents = 0, numOfComponentBlocks = 0;
  46:   private ArrayList components = new ArrayList();
  47: 
  48:   public JPEGScan()
  49:   {
  50:     // Nothing to do here.
  51:   }
  52: 
  53:   public JPEGScan(int h, int w)
  54:   {
  55:     maxHeight=h;
  56:     maxWidth=w;
  57:   }
  58: 
  59:   private void recalculateDimensions()
  60:   {
  61:     JPEGComponent comp;
  62: 
  63:     // Compute the maximum H, maximum V factors defined in Annex A of the ISO
  64:     // DIS 10918-1.
  65:     for(int i=0; i < components.size() ; i++)
  66:       {
  67:         comp = (JPEGComponent)components.get(i);
  68:         if(comp.factorH > maxH)
  69:           maxH=comp.factorH;
  70:         if(comp.factorV > maxV)
  71:           maxV=comp.factorV;
  72:       }
  73: 
  74:     for(int i=0; i < components.size() ; i++)
  75:       {
  76:         comp = (JPEGComponent)components.get(i);
  77:         comp.maxH = maxH;
  78:         comp.maxV = maxV;
  79:       }
  80: 
  81:   }
  82: 
  83:   public void addComponent(byte id, byte factorHorizontal, byte factorVertical,
  84:                            byte quantizationID)
  85:   {
  86:     JPEGComponent component = new JPEGComponent(id, factorHorizontal, factorVertical, quantizationID);
  87:     components.add((Object)component);
  88:     recalculateDimensions();
  89:     numOfComponents++;
  90:     numOfComponentBlocks += factorHorizontal*factorVertical;
  91:   }
  92: 
  93:   public JPEGComponent getComponentByID(byte id)
  94:   {
  95:     JPEGComponent comp = (JPEGComponent)components.get(0);
  96:     for(int i=0; i < components.size() ; i++)
  97:       {
  98:         comp=(JPEGComponent)components.get(i);
  99:         if(comp.component_id==id)
 100:           break;
 101:       }
 102:     return(comp);
 103:   }
 104: 
 105:   public JPEGComponent get(int id)
 106:   {
 107:     return((JPEGComponent)components.get(id));
 108:   }
 109: 
 110:   public int getX(byte id)
 111:   {
 112:     JPEGComponent comp = getComponentByID(id);
 113:     return(comp.width);
 114:   }
 115: 
 116:   public int getY(byte id)
 117:   {
 118:     JPEGComponent comp = getComponentByID(id);
 119:     return(comp.height);
 120:   }
 121: 
 122:   public int getMaxV()
 123:   {
 124:     return(maxV);
 125:   }
 126: 
 127:   public int getMaxH()
 128:   {
 129:     return(maxH);
 130:   }
 131: 
 132:   public void setWidth(int w)
 133:   {
 134:     maxWidth=w;
 135:   }
 136: 
 137:   public void setHeight(int h)
 138:   {
 139:     maxHeight=h;
 140:   }
 141: 
 142:   public int size()
 143:   {
 144:     return(numOfComponents);
 145:   }
 146: 
 147:   public int sizeComponentBlocks()
 148:   {
 149:     return(numOfComponentBlocks);
 150:   }
 151: }