libjava/jni/gtk-peer/gnu_java_awt_peer_gtk_GdkFontMetrics.c

   1 /* gdkfontmetrics.c
   2    Copyright (C) 1999, 2003 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 #include "gtkpeer.h"
  39 #include "gnu_java_awt_peer_gtk_GdkFontMetrics.h"
  40 #include <gdk/gdkx.h>
  41
  42 #define ASCENT      0
  43 #define MAX_ASCENT  1
  44 #define DESCENT     2
  45 #define MAX_DESCENT 3
  46 #define MAX_ADVANCE 4
  47 #define NUM_METRICS 5
  48
  49 JNIEXPORT jintArray JNICALL Java_gnu_java_awt_peer_gtk_GdkFontMetrics_initState
  50   (JNIEnv *env, jobject obj __attribute__((unused)), jstring fname, jint size)
  51 {
  52   jintArray array;
  53   jint *metrics;
  54   const char *font_name;
  55   PangoFontDescription *font_desc;
  56   PangoContext *context;
  57   PangoFontMetrics *pango_metrics;
  58
  59   array = (*env)->NewIntArray (env, NUM_METRICS);
  60
  61   metrics = (*env)->GetIntArrayElements (env, array, NULL);
  62   font_name = (*env)->GetStringUTFChars (env, fname, NULL);
  63
  64   gdk_threads_enter ();
  65
  66   font_desc = pango_font_description_from_string (font_name);
  67   pango_font_description_set_size (font_desc, size * PANGO_SCALE);
  68
  69   context = gdk_pango_context_get();
  70   pango_context_set_font_description (context, font_desc);
  71
  72   pango_metrics = pango_context_get_metrics (context, font_desc, NULL);
  73
  74   metrics[ASCENT] =
  75     pango_font_metrics_get_ascent (pango_metrics) / PANGO_SCALE;
  76   metrics[MAX_ASCENT]  = metrics[ASCENT];
  77   metrics[DESCENT] =
  78     pango_font_metrics_get_descent (pango_metrics) / PANGO_SCALE;
  79   metrics[MAX_DESCENT] = metrics[DESCENT];
  80   metrics[MAX_ADVANCE] =
  81     pango_font_metrics_get_approximate_char_width (pango_metrics) / PANGO_SCALE;
  82
  83   pango_font_metrics_unref (pango_metrics);
  84
  85   pango_font_description_free (font_desc);
  86
  87   gdk_threads_leave ();
  88
  89   (*env)->ReleaseStringUTFChars (env, fname, font_name);
  90   (*env)->ReleaseIntArrayElements (env, array, metrics, 0);
  91
  92   return array;
  93 }
  94
  95 JNIEXPORT jint JNICALL Java_gnu_java_awt_peer_gtk_GdkFontMetrics_stringWidth
  96   (JNIEnv *env, jobject obj __attribute__((unused)),
  97    jstring fname, jint size, jstring str)
  98 {
  99   PangoFontDescription *font_desc;
 100   PangoContext *context;
 101   PangoLayout *layout;
 102   int width = 0;
 103   const char *cstr;
 104   const char *font_name;
 105
 106   cstr = (*env)->GetStringUTFChars (env, str, NULL);
 107   font_name = (*env)->GetStringUTFChars (env, fname, NULL);
 108
 109   gdk_threads_enter ();
 110
 111   font_desc = pango_font_description_from_string (font_name);
 112   pango_font_description_set_size (font_desc, size * PANGO_SCALE);
 113
 114   context = gdk_pango_context_get();
 115   pango_context_set_font_description (context, font_desc);
 116
 117   layout = pango_layout_new (context);
 118
 119   pango_layout_set_text (layout, cstr, -1);
 120   pango_layout_get_pixel_size (layout, &width, NULL);
 121
 122   pango_font_description_free (font_desc);
 123
 124   gdk_threads_leave ();
 125
 126   (*env)->ReleaseStringUTFChars (env, fname, font_name);
 127   (*env)->ReleaseStringUTFChars (env, str, cstr);
 128
 129   return width;
 130 }