libjava/jni/gtk-peer/gnu_java_awt_peer_gtk_GdkFontMetrics.c

   1 /* gdkfontmetrics.c
   2    Copyright (C) 1999, 2003, 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 #include "gtkpeer.h"
  39 #include "gdkfont.h"
  40
  41 #include "gnu_java_awt_peer_gtk_GdkFontMetrics.h"
  42 #include <gdk/gdkx.h>
  43
  44 JNIEXPORT void JNICALL
  45 Java_gnu_java_awt_peer_gtk_GdkFontMetrics_getPeerFontMetrics
  46    (JNIEnv *env, jclass clazz __attribute__ ((unused)), jobject java_font, jdoubleArray java_metrics)
  47 {
  48   struct peerfont *pfont = NULL;
  49   jdouble *native_metrics = NULL;
  50   PangoFontMetrics *pango_metrics;
  51
  52   gdk_threads_enter();
  53
  54   pfont = (struct peerfont *) NSA_GET_FONT_PTR (env, java_font);
  55   g_assert (pfont != NULL);
  56
  57   pango_metrics = pango_context_get_metrics (pfont->ctx, pfont->desc,
  58                                              gtk_get_default_language ());
  59
  60   native_metrics = (*env)->GetDoubleArrayElements (env, java_metrics, NULL);
  61   g_assert (native_metrics != NULL);
  62
  63   native_metrics[FONT_METRICS_ASCENT] = PANGO_PIXELS (pango_font_metrics_get_ascent (pango_metrics));
  64   native_metrics[FONT_METRICS_MAX_ASCENT] = native_metrics[FONT_METRICS_ASCENT];
  65   native_metrics[FONT_METRICS_DESCENT] = PANGO_PIXELS (pango_font_metrics_get_descent (pango_metrics));
  66   if (native_metrics[FONT_METRICS_DESCENT] < 0)
  67     native_metrics[FONT_METRICS_DESCENT] = - native_metrics[FONT_METRICS_DESCENT];
  68   native_metrics[FONT_METRICS_MAX_DESCENT] = native_metrics[FONT_METRICS_DESCENT];
  69   native_metrics[FONT_METRICS_MAX_ADVANCE] = PANGO_PIXELS (pango_font_metrics_get_approximate_char_width (pango_metrics));
  70
  71   (*env)->ReleaseDoubleArrayElements (env, java_metrics, native_metrics, 0);
  72
  73   pango_font_metrics_unref (pango_metrics);
  74
  75   gdk_threads_leave();
  76 }
  77
  78 JNIEXPORT void JNICALL
  79 Java_gnu_java_awt_peer_gtk_GdkFontMetrics_getPeerTextMetrics
  80    (JNIEnv *env, jclass clazz __attribute__ ((unused)), jobject java_font, jstring str, jdoubleArray java_metrics)
  81 {
  82   struct peerfont *pfont = NULL;
  83   const char *cstr = NULL;
  84   jdouble *native_metrics = NULL;
  85   PangoRectangle log;
  86
  87   gdk_threads_enter();
  88
  89   pfont = (struct peerfont *)NSA_GET_FONT_PTR (env, java_font);
  90   g_assert (pfont != NULL);
  91
  92   cstr = (*env)->GetStringUTFChars (env, str, NULL);
  93   g_assert(cstr != NULL);
  94
  95   pango_layout_set_text (pfont->layout, cstr, -1);
  96   pango_layout_get_extents (pfont->layout, NULL, &log);
  97
  98   (*env)->ReleaseStringUTFChars (env, str, cstr);
  99   pango_layout_set_text (pfont->layout, "", -1);
 100
 101   native_metrics = (*env)->GetDoubleArrayElements (env, java_metrics, NULL);
 102   g_assert (native_metrics != NULL);
 103
 104   native_metrics[TEXT_METRICS_X_BEARING] = PANGO_PIXELS(log.x);
 105   native_metrics[TEXT_METRICS_Y_BEARING] = PANGO_PIXELS(log.y);
 106   native_metrics[TEXT_METRICS_WIDTH] = PANGO_PIXELS(log.width);
 107   native_metrics[TEXT_METRICS_HEIGHT] = PANGO_PIXELS(log.height);
 108   native_metrics[TEXT_METRICS_X_ADVANCE] = PANGO_PIXELS(log.x + log.width);
 109   native_metrics[TEXT_METRICS_Y_ADVANCE] = PANGO_PIXELS(log.y + log.height);
 110
 111   (*env)->ReleaseDoubleArrayElements (env, java_metrics, native_metrics, 0);
 112
 113   gdk_threads_leave();
 114 }
 115