001    /* FontRenderContext.java
002       Copyright (C) 2002, 2003 Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package java.awt.font;
040    
041    import java.awt.geom.AffineTransform;
042    
043    /**
044     * @author Michael Koch
045     */
046    public class FontRenderContext
047    {
048      private AffineTransform affineTransform;
049      private boolean isAntiAliased;
050      private boolean usesFractionalMetrics;
051     
052      /**
053       * Construct a new <code>FontRenderContext</code>.
054       */
055      protected FontRenderContext()
056      {
057        // Do nothing here.
058      }
059     
060      /**
061       * Construct a new <code>FontRenderContext</code>.
062       */
063      public FontRenderContext (AffineTransform tx, boolean isAntiAliased,
064                                boolean usesFractionalMetrics)
065      {
066        if (tx != null
067            && !tx.isIdentity ())
068          {
069            this.affineTransform = new AffineTransform (tx);
070          }
071        
072        this.isAntiAliased = isAntiAliased;
073        this.usesFractionalMetrics = usesFractionalMetrics;
074      }
075    
076      public boolean equals (Object obj)
077      {
078        if (! (obj instanceof FontRenderContext))
079          return false;
080    
081        return equals ((FontRenderContext) obj);
082      }
083    
084      public boolean equals (FontRenderContext rhs)
085      {
086        if (rhs == null)
087          return false;
088    
089        if (affineTransform == null && rhs.affineTransform != null
090            || affineTransform != null && rhs.affineTransform == null)
091          return false;
092    
093        return ((affineTransform == rhs.affineTransform
094                 || affineTransform.equals (rhs.getTransform ()))
095                && isAntiAliased == rhs.isAntiAliased ()
096                && usesFractionalMetrics == rhs.usesFractionalMetrics ());
097      }
098    
099    
100      /**
101       * Retrieves the affine transform for scaling typographical points
102       * to raster pixels.
103       *
104       * @return a clone of the transform object.
105       */
106      public AffineTransform getTransform ()
107      {
108        if (affineTransform == null)
109          return new AffineTransform ();
110        else
111          return new AffineTransform (affineTransform);
112      }
113    
114    
115      /**
116       * Returns the hash code of the font render context.
117       */
118      public int hashCode ()
119      {
120        int code = ( isAntiAliased ? 1 : 0 ) + ( usesFractionalMetrics ? 2 : 0 );
121    
122        if( affineTransform != null && !affineTransform.isIdentity() )
123          code ^= affineTransform.hashCode();
124    
125        return code;
126      }
127    
128      public boolean isAntiAliased ()
129      {
130        return isAntiAliased;
131      }
132    
133      public boolean usesFractionalMetrics ()
134      {
135        return usesFractionalMetrics;
136      }
137    }
138