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

   1 /* GdkFontMetrics.java
   2    Copyright (C) 1999, 2002, 2004  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 gnu.java.awt.ClasspathToolkit;
  42
  43 import java.awt.Font;
  44 import java.awt.FontMetrics;
  45 import java.awt.Toolkit;
  46
  47 public class GdkFontMetrics extends FontMetrics
  48 {
  49
  50   private int[] font_metrics;
  51   GdkFontPeer peer;
  52
  53   static final int FONT_METRICS_ASCENT = 0;
  54   static final int FONT_METRICS_MAX_ASCENT = 1;
  55   static final int FONT_METRICS_DESCENT = 2;
  56   static final int FONT_METRICS_MAX_DESCENT = 3;
  57   static final int FONT_METRICS_MAX_ADVANCE = 4;
  58
  59   static final int TEXT_METRICS_X_BEARING = 0;
  60   static final int TEXT_METRICS_Y_BEARING = 1;
  61   static final int TEXT_METRICS_WIDTH = 2;
  62   static final int TEXT_METRICS_HEIGHT = 3;
  63   static final int TEXT_METRICS_X_ADVANCE = 4;
  64   static final int TEXT_METRICS_Y_ADVANCE = 5;
  65
  66
  67   public GdkFontMetrics (Font font)
  68   {
  69     super (font.getPeer() instanceof GdkFontPeer
  70            ? font
  71            : ((ClasspathToolkit)(Toolkit.getDefaultToolkit ()))
  72            .getFont (font.getName(), font.getAttributes ()));
  73
  74     peer = (GdkFontPeer) this.font.getPeer();
  75
  76     font_metrics = new int[5];
  77     double [] hires = new double[5];
  78     peer.getFontMetrics (hires);
  79     for (int i = 0; i < 5; ++i)
  80       font_metrics[i] = (int) hires[i];
  81   }
  82
  83   public int stringWidth (String str)
  84   {
  85     double [] hires = new double[6];
  86     peer.getTextMetrics(str, hires);
  87     return (int) hires [TEXT_METRICS_WIDTH];
  88   }
  89
  90   public int charWidth (char ch)
  91   {
  92     return stringWidth (new String (new char[] { ch }));
  93   }
  94
  95   public int charsWidth (char data[], int off, int len)
  96   {
  97     return stringWidth (new String (data, off, len));
  98   }
  99
 100   /*
 101      Sun's Motif implementation always returns 0 or 1 here (???), but
 102      going by the X11 man pages, it seems as though we should return
 103      font.ascent + font.descent.
 104   */
 105   public int getLeading ()
 106   {
 107     return 1;
 108   }
 109
 110   public int getAscent ()
 111   {
 112     return font_metrics[FONT_METRICS_ASCENT];
 113   }
 114
 115   public int getMaxAscent ()
 116   {
 117     return font_metrics[FONT_METRICS_MAX_ASCENT];
 118   }
 119
 120   public int getDescent ()
 121   {
 122     return font_metrics[FONT_METRICS_DESCENT];
 123   }
 124
 125   public int getMaxDescent ()
 126   {
 127     return font_metrics[FONT_METRICS_MAX_DESCENT];
 128   }
 129
 130   public int getMaxAdvance ()
 131   {
 132     return font_metrics[FONT_METRICS_MAX_ADVANCE];
 133   }
 134 }