Source code: 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., 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
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 }