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fontset.c

/* Nabi - X Input Method server for hangul
 * Copyright (C) 2003,2004 Choe Hwanjin
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <glib.h>

#include "gettext.h"
#include "fontset.h"

static GHashTable *fontset_hash = NULL;
static GSList *fontset_list = NULL;
static Display *_display = NULL;

static NabiFontSet*
nabi_fontset_new(const char *name)
{
    XFontSet xfontset;
    XFontStruct **font_structs;
    int i, nfonts, ascent, descent;
    char **font_names;
    NabiFontSet *fontset;
    char **missing_list;
    int    missing_list_count;
    char  *error_message;

    xfontset = XCreateFontSet(_display,
                              name,
                              &missing_list,
                              &missing_list_count,
                              &error_message);
    if (missing_list_count > 0) {
      gchar *name2;
        XFreeStringList(missing_list);
      name2 = g_strconcat(name, ",*", NULL);
      xfontset = XCreateFontSet(_display,
                          name2,
                          &missing_list,
                          &missing_list_count,
                          &error_message);
      g_free(name2);
      if (missing_list_count > 0) {
          fprintf(stderr, _("Nabi: missing charset\n"));
          fprintf(stderr, _("Nabi: font: %s\n"), name);
          for (i = 0; i < missing_list_count; i++)
            fprintf(stderr, "  %s\n", missing_list[i]);
          XFreeStringList(missing_list);
          return NULL;
      }
    }

    /* get acsent and descent */
    nfonts = XFontsOfFontSet(xfontset, &font_structs, &font_names);
    /* find width, height */
    for (i = 0, ascent = 1, descent = 0; i < nfonts; i++) {
        if (ascent < font_structs[i]->ascent)
            ascent = font_structs[i]->ascent;
        if (descent < font_structs[i]->descent)
            descent = font_structs[i]->descent;
    }

    fontset = g_malloc(sizeof(NabiFontSet));
    fontset->name = g_strdup(name);
    fontset->ref = 1;
    fontset->xfontset = xfontset;
    fontset->ascent = ascent;
    fontset->descent = descent;

    g_hash_table_insert(fontset_hash, fontset->name, fontset);
    fontset_list = g_slist_prepend(fontset_list, fontset);

    return fontset;
}

static void
nabi_fontset_ref(NabiFontSet *fontset)
{
    if (fontset == NULL)
      return;

    fontset->ref++;
}

static void
nabi_fontset_unref(NabiFontSet *fontset)
{
    if (fontset == NULL)
      return;

    fontset->ref--;
    if (fontset->ref <= 0) {
      g_hash_table_remove(fontset_hash, fontset->name);
      fontset_list = g_slist_remove(fontset_list, fontset);

      XFreeFontSet(_display, fontset->xfontset);
      g_free(fontset->name);
      g_free(fontset);
    }
}

static NabiFontSet*
nabi_fontset_find_by_xfontset(XFontSet xfontset)
{
    NabiFontSet *fontset;
    GSList *list;
    list = fontset_list;

    while (list != NULL) {
      fontset = (NabiFontSet*)(list->data);
      if (fontset->xfontset == xfontset)
          return fontset;
      list = list->next;
    }

    return NULL;
}

NabiFontSet*
nabi_fontset_create(Display *display, const char *fontset_name)
{
    NabiFontSet *nabi_fontset;

    _display = display;
    if (fontset_hash == NULL)
      fontset_hash = g_hash_table_new(g_str_hash, g_str_equal);

    nabi_fontset = g_hash_table_lookup(fontset_hash, fontset_name);
    if (nabi_fontset != NULL) {
      nabi_fontset_ref(nabi_fontset);
      return nabi_fontset;
    }

    nabi_fontset = nabi_fontset_new(fontset_name);

    return nabi_fontset;
}

void
nabi_fontset_free(Display *display, XFontSet xfontset)
{
    NabiFontSet *nabi_fontset;

    _display = display;
    nabi_fontset = nabi_fontset_find_by_xfontset(xfontset);
    nabi_fontset_unref(nabi_fontset);
}

void
nabi_fontset_free_all(Display *display)
{
    NabiFontSet *fontset;
    GSList *list;
    _display = display;

    if (fontset_list != NULL) {
      fprintf(stderr,
            "Nabi: remaining fontsets will be freed,"
            "this must be an error\n");
      list = fontset_list;
      while (list != NULL) {
          fontset = (NabiFontSet*)(list->data);
          XFreeFontSet(_display, fontset->xfontset);
          g_free(fontset->name);
          g_free(fontset);
          list = list->next;
      }
    }

    if (fontset_hash != NULL)
      g_hash_table_destroy(fontset_hash);
    if (fontset_list != NULL)
      g_slist_free(fontset_list);
}

/* vim: set ts=8 sw=4 : */

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