libjava/gnu/java/awt/peer/gtk/GdkClasspathFontPeerMetrics.java

   1 /* GdkClasspathFontPeerMetrics.java
   2    Copyright (C) 1999, 2002 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., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 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.java.awt.peer.gtk;
  40
  41 import java.awt.*;
  42 import java.awt.font.*;
  43 import java.awt.geom.*;
  44
  45 public class GdkClasspathFontPeerMetrics extends FontMetrics
  46 {
  47   private final int native_state = GtkGenericPeer.getUniqueInteger();
  48
  49   private static final int ASCENT = 0, MAX_ASCENT = 1,
  50                        DESCENT = 2, MAX_DESCENT = 3,
  51                        MAX_ADVANCE = 4;
  52
  53   private int[] metrics;
  54   private native int[] initState (Object font);
  55
  56   public GdkClasspathFontPeerMetrics (Font font)
  57   {
  58     super (font);
  59     metrics = initState (font.getPeer());
  60   }
  61
  62   public int stringWidth (String str)
  63   {
  64     GlyphVector gv = font.createGlyphVector
  65       (new FontRenderContext
  66        (new AffineTransform (), false, false), str);
  67     Rectangle2D r = gv.getVisualBounds ();
  68     return (int) r.getWidth ();
  69   }
  70
  71   public int charWidth (char ch)
  72   {
  73     return stringWidth (new String (new char[] { ch }));
  74   }
  75
  76   public int charsWidth (char data[], int off, int len)
  77   {
  78     return stringWidth (new String (data, off, len));
  79   }
  80
  81   /*
  82      Sun's Motif implementation always returns 0 or 1 here (???), but
  83      going by the X11 man pages, it seems as though we should return
  84      font.ascent + font.descent.
  85   */
  86   public int getLeading ()
  87   {
  88     return 1;
  89 //      return metrics[ASCENT] + metrics[DESCENT];
  90   }
  91
  92   public int getAscent ()
  93   {
  94     return metrics[ASCENT];
  95   }
  96
  97   public int getMaxAscent ()
  98   {
  99     return metrics[MAX_ASCENT];
 100   }
 101
 102   public int getDescent ()
 103   {
 104     return metrics[DESCENT];
 105   }
 106
 107   public int getMaxDescent ()
 108   {
 109     return metrics[MAX_DESCENT];
 110   }
 111
 112   public int getMaxAdvance ()
 113   {
 114     return metrics[MAX_ADVANCE];
 115   }
 116 }