001/* FontRenderContext.java
002   Copyright (C) 2002, 2003 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package java.awt.font;
040
041import java.awt.geom.AffineTransform;
042
043/**
044 * @author Michael Koch
045 */
046public 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