source: trunk/third/gtk/gdk/gdkfont.c @ 17071

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <X11/Xlib.h>
#include <X11/Xos.h>
#include "gdk.h"
#include "gdkprivate.h"

#if HAVE_CONFIG_H
#  include <config.h>
#  if STDC_HEADERS
#    include <string.h>
#  endif
#endif

#ifdef USE_NATIVE_LOCALE
#include <stdlib.h>
#endif

static GHashTable *font_name_hash = NULL;
static GHashTable *fontset_name_hash = NULL;

#define FONT_XFONT(private)  ((XFontStruct *)(private)->xfont)
#define FONT_IS_8BIT(private) ((FONT_XFONT(private)->min_byte1 == 0) && \
                               (FONT_XFONT(private)->max_byte1 == 0))

static void
gdk_font_hash_insert (GdkFontType type, GdkFont *font, const gchar *font_name)
{
  GdkFontPrivate *private = (GdkFontPrivate *)font;
  GHashTable **hashp = (type == GDK_FONT_FONT) ?
    &font_name_hash : &fontset_name_hash;

  if (!*hashp)
    *hashp = g_hash_table_new (g_str_hash, g_str_equal);

  private->names = g_slist_prepend (private->names, g_strdup (font_name));
  g_hash_table_insert (*hashp, private->names->data, font);
}

static void
gdk_font_hash_remove (GdkFontType type, GdkFont *font)
{
  GdkFontPrivate *private = (GdkFontPrivate *)font;
  GSList *tmp_list;
  GHashTable *hash = (type == GDK_FONT_FONT) ?
    font_name_hash : fontset_name_hash;

  tmp_list = private->names;
  while (tmp_list)
    {
      g_hash_table_remove (hash, tmp_list->data);
      g_free (tmp_list->data);
      
      tmp_list = tmp_list->next;
    }

  g_slist_free (private->names);
  private->names = NULL;
}

static GdkFont *
gdk_font_hash_lookup (GdkFontType type, const gchar *font_name)
{
  GdkFont *result;
  GHashTable *hash = (type == GDK_FONT_FONT) ?
    font_name_hash : fontset_name_hash;

  if (!hash)
    return NULL;
  else
    {
      result = g_hash_table_lookup (hash, font_name);
      if (result)
        gdk_font_ref (result);
      
      return result;
    }
}

GdkFont*
gdk_font_load (const gchar *font_name)
{
  GdkFont *font;
  GdkFontPrivate *private;
  XFontStruct *xfont;

  g_return_val_if_fail (font_name != NULL, NULL);

  font = gdk_font_hash_lookup (GDK_FONT_FONT, font_name);
  if (font)
    return font;

  xfont = XLoadQueryFont (gdk_display, font_name);
  if (xfont == NULL)
    return NULL;

  font = gdk_font_lookup (xfont->fid);
  if (font != NULL)
    {
      private = (GdkFontPrivate *) font;
      if (xfont != private->xfont)
        XFreeFont (gdk_display, xfont);

      gdk_font_ref (font);
    }
  else
    {
      private = g_new (GdkFontPrivate, 1);
      private->xdisplay = gdk_display;
      private->xfont = xfont;
      private->ref_count = 1;
      private->names = NULL;
 
      font = (GdkFont*) private;
      font->type = GDK_FONT_FONT;
      font->ascent =  xfont->ascent;
      font->descent = xfont->descent;

      gdk_xid_table_insert (&xfont->fid, font);
    }

  gdk_font_hash_insert (GDK_FONT_FONT, font, font_name);

  return font;
}

GdkFont*
gdk_fontset_load (const gchar *fontset_name)
{
  GdkFont *font;
  GdkFontPrivate *private;
  XFontSet fontset;
  gint  missing_charset_count;
  gchar **missing_charset_list;
  gchar *def_string;

  font = gdk_font_hash_lookup (GDK_FONT_FONTSET, fontset_name);
  if (font)
    return font;

  private = g_new (GdkFontPrivate, 1);
  font = (GdkFont*) private;

  private->xdisplay = gdk_display;
  fontset = XCreateFontSet (gdk_display, fontset_name,
                            &missing_charset_list, &missing_charset_count,
                            &def_string);

  if (missing_charset_count)
    {
      gint i;
      g_warning ("Missing charsets in FontSet creation\n");
      for (i=0;i<missing_charset_count;i++)
        g_warning ("    %s\n", missing_charset_list[i]);
      XFreeStringList (missing_charset_list);
    }

  private->ref_count = 1;

  if (!fontset)
    {
      g_free (font);
      return NULL;
    }
  else
    {
      gint num_fonts;
      gint i;
      XFontStruct **font_structs;
      gchar **font_names;
      
      private->xfont = fontset;
      font->type = GDK_FONT_FONTSET;
      num_fonts = XFontsOfFontSet (fontset, &font_structs, &font_names);

      font->ascent = font->descent = 0;
      
      for (i = 0; i < num_fonts; i++)
        {
          font->ascent = MAX (font->ascent, font_structs[i]->ascent);
          font->descent = MAX (font->descent, font_structs[i]->descent);
        }

      private->names = NULL;
      gdk_font_hash_insert (GDK_FONT_FONTSET, font, fontset_name);
      
      return font;
    }
}

GdkFont*
gdk_font_ref (GdkFont *font)
{
  GdkFontPrivate *private;

  g_return_val_if_fail (font != NULL, NULL);

  private = (GdkFontPrivate*) font;
  private->ref_count += 1;
  return font;
}

void
gdk_font_unref (GdkFont *font)
{
  GdkFontPrivate *private;
  private = (GdkFontPrivate*) font;

  g_return_if_fail (font != NULL);
  g_return_if_fail (private->ref_count > 0);

  private->ref_count -= 1;
  if (private->ref_count == 0)
    {
      gdk_font_hash_remove (font->type, font);
      
      switch (font->type)
        {
        case GDK_FONT_FONT:
          gdk_xid_table_remove (((XFontStruct *) private->xfont)->fid);
          XFreeFont (private->xdisplay, (XFontStruct *) private->xfont);
          break;
        case GDK_FONT_FONTSET:
          XFreeFontSet (private->xdisplay, (XFontSet) private->xfont);
          break;
        default:
          g_error ("unknown font type.");
          break;
        }
      g_free (font);
    }
}

gint
gdk_font_id (const GdkFont *font)
{
  const GdkFontPrivate *font_private;

  g_return_val_if_fail (font != NULL, 0);

  font_private = (const GdkFontPrivate*) font;

  if (font->type == GDK_FONT_FONT)
    {
      return ((XFontStruct *) font_private->xfont)->fid;
    }
  else
    {
      return 0;
    }
}

gboolean
gdk_font_equal (const GdkFont *fonta,
                const GdkFont *fontb)
{
  const GdkFontPrivate *privatea;
  const GdkFontPrivate *privateb;

  g_return_val_if_fail (fonta != NULL, FALSE);
  g_return_val_if_fail (fontb != NULL, FALSE);

  privatea = (const GdkFontPrivate*) fonta;
  privateb = (const GdkFontPrivate*) fontb;

  if (fonta->type == GDK_FONT_FONT && fontb->type == GDK_FONT_FONT)
    {
      return (((XFontStruct *) privatea->xfont)->fid ==
              ((XFontStruct *) privateb->xfont)->fid);
    }
  else if (fonta->type == GDK_FONT_FONTSET && fontb->type == GDK_FONT_FONTSET)
    {
      gchar *namea, *nameb;

      namea = XBaseFontNameListOfFontSet((XFontSet) privatea->xfont);
      nameb = XBaseFontNameListOfFontSet((XFontSet) privateb->xfont);
      
      return (strcmp(namea, nameb) == 0);
    }
  else
    /* fontset != font */
    return FALSE;
}

gint
gdk_string_width (GdkFont     *font,
                  const gchar *string)
{
  GdkFontPrivate *font_private;
  gint width;
  XFontStruct *xfont;
  XFontSet fontset;

  g_return_val_if_fail (font != NULL, -1);
  g_return_val_if_fail (string != NULL, -1);

  font_private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
      xfont = (XFontStruct *) font_private->xfont;
      if ((xfont->min_byte1 == 0) && (xfont->max_byte1 == 0))
        {
          width = XTextWidth (xfont, string, strlen (string));
        }
      else
        {
          width = XTextWidth16 (xfont, (XChar2b *) string, strlen (string) / 2);
        }
      break;
    case GDK_FONT_FONTSET:
      fontset = (XFontSet) font_private->xfont;
      width = XmbTextEscapement (fontset, string, strlen(string));
      break;
    default:
      width = 0;
    }

  return width;
}

gint
gdk_text_width (GdkFont      *font,
                const gchar  *text,
                gint          text_length)
{
  GdkFontPrivate *private;
  gint width;
  XFontStruct *xfont;
  XFontSet fontset;

  g_return_val_if_fail (font != NULL, -1);
  g_return_val_if_fail (text != NULL, -1);

  private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
      xfont = (XFontStruct *) private->xfont;
      if ((xfont->min_byte1 == 0) && (xfont->max_byte1 == 0))
        {
          width = XTextWidth (xfont, text, text_length);
        }
      else
        {
          width = XTextWidth16 (xfont, (XChar2b *) text, text_length / 2);
        }
      break;
    case GDK_FONT_FONTSET:
      fontset = (XFontSet) private->xfont;
      width = XmbTextEscapement (fontset, text, text_length);
      break;
    default:
      width = 0;
    }
  return width;
}

gint
gdk_text_width_wc (GdkFont        *font,
                   const GdkWChar *text,
                   gint            text_length)
{
  GdkFontPrivate *private;
  gint width;
  XFontSet fontset;

  g_return_val_if_fail (font != NULL, -1);
  g_return_val_if_fail (text != NULL, -1);

  private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
      {
        gchar *glyphs;
        int glyphs_len;

        if (_gdk_font_wc_to_glyphs (font, text, text_length,
                                    &glyphs, &glyphs_len))
          {
            width = gdk_text_width (font, glyphs, glyphs_len);
            g_free (glyphs);
          }
        else
          width = 0;

        break;
      }
    case GDK_FONT_FONTSET:
      if (sizeof(GdkWChar) == sizeof(wchar_t))
        {
          fontset = (XFontSet) private->xfont;
          width = XwcTextEscapement (fontset, (wchar_t *)text, text_length);
        }
      else
        {
          wchar_t *text_wchar;
          gint i;
          fontset = (XFontSet) private->xfont;
          text_wchar = g_new(wchar_t, text_length);
          for (i=0; i<text_length; i++) text_wchar[i] = text[i];
          width = XwcTextEscapement (fontset, text_wchar, text_length);
          g_free (text_wchar);
        }
      break;
    default:
      width = 0;
    }
  return width;
}

/* Problem: What if a character is a 16 bits character ?? */
gint
gdk_char_width (GdkFont *font,
                gchar    character)
{
  GdkFontPrivate *private;
  XCharStruct *chars;
  gint width;
  guint ch = character & 0xff;  /* get rid of sign-extension */
  XFontStruct *xfont;
  XFontSet fontset;

  g_return_val_if_fail (font != NULL, -1);

  private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
      /* only 8 bits characters are considered here */
      xfont = (XFontStruct *) private->xfont;
      if ((xfont->min_byte1 == 0) &&
          (xfont->max_byte1 == 0) &&
          (ch >= xfont->min_char_or_byte2) &&
          (ch <= xfont->max_char_or_byte2))
        {
          chars = xfont->per_char;
          if (chars)
            width = chars[ch - xfont->min_char_or_byte2].width;
          else
            width = xfont->min_bounds.width;
        }
      else
        {
          width = XTextWidth (xfont, &character, 1);
        }
      break;
    case GDK_FONT_FONTSET:
      fontset = (XFontSet) private->xfont;
      width = XmbTextEscapement (fontset, &character, 1) ;
      break;
    default:
      width = 0;
    }
  return width;
}

gint
gdk_char_width_wc (GdkFont *font,
                   GdkWChar character)
{
  GdkFontPrivate *private;
  gint width;
  XFontSet fontset;

  g_return_val_if_fail (font != NULL, -1);

  private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
#ifdef USE_NATIVE_LOCALE
      if (MB_CUR_MAX == 1 && FONT_IS_8BIT(private))
        {
          char c;
          g_assert (wctomb(&c,character) == 1);

          return gdk_char_width (font, c);
        }
      else
#endif /* USE_NATIVE_LOCALE */
        {
          gchar *glyphs;
          int glyphs_len;

          if (_gdk_font_wc_to_glyphs (font, &character, 1, &glyphs, &glyphs_len))
            {
              width = gdk_text_width (font, glyphs, glyphs_len);
              g_free (glyphs);
            }
          else
            width = 0;
          
          break;
        }
    case GDK_FONT_FONTSET:
      fontset = (XFontSet) private->xfont;
      {
        wchar_t char_wc = character;
        width = XwcTextEscapement (fontset, &char_wc, 1) ;
      }
      break;
    default:
      width = 0;
    }
  return width;
}

gint
gdk_string_measure (GdkFont     *font,
                    const gchar *string)
{
  g_return_val_if_fail (font != NULL, -1);
  g_return_val_if_fail (string != NULL, -1);

  return gdk_text_measure (font, string, strlen (string));
}

void
gdk_text_extents (GdkFont     *font,
                  const gchar *text,
                  gint         text_length,
                  gint        *lbearing,
                  gint        *rbearing,
                  gint        *width,
                  gint        *ascent,
                  gint        *descent)
{
  GdkFontPrivate *private;
  XCharStruct overall;
  XFontStruct *xfont;
  XFontSet    fontset;
  XRectangle  ink, logical;
  int direction;
  int font_ascent;
  int font_descent;

  g_return_if_fail (font != NULL);
  g_return_if_fail (text != NULL);

  private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
      xfont = (XFontStruct *) private->xfont;
      if ((xfont->min_byte1 == 0) && (xfont->max_byte1 == 0))
        {
          XTextExtents (xfont, text, text_length,
                        &direction, &font_ascent, &font_descent,
                        &overall);
        }
      else
        {
          XTextExtents16 (xfont, (XChar2b *) text, text_length / 2,
                          &direction, &font_ascent, &font_descent,
                          &overall);
        }
      if (lbearing)
        *lbearing = overall.lbearing;
      if (rbearing)
        *rbearing = overall.rbearing;
      if (width)
        *width = overall.width;
      if (ascent)
        *ascent = overall.ascent;
      if (descent)
        *descent = overall.descent;
      break;
    case GDK_FONT_FONTSET:
      fontset = (XFontSet) private->xfont;
      XmbTextExtents (fontset, text, text_length, &ink, &logical);
      if (lbearing)
        *lbearing = ink.x;
      if (rbearing)
        *rbearing = ink.x + ink.width;
      if (width)
        *width = logical.width;
      if (ascent)
        *ascent = -ink.y;
      if (descent)
        *descent = ink.y + ink.height;
      break;
    }

}

void
gdk_text_extents_wc (GdkFont        *font,
                     const GdkWChar *text,
                     gint            text_length,
                     gint           *lbearing,
                     gint           *rbearing,
                     gint           *width,
                     gint           *ascent,
                     gint           *descent)
{
  GdkFontPrivate *private;
  XFontSet    fontset;
  XRectangle  ink, logical;

  g_return_if_fail (font != NULL);
  g_return_if_fail (text != NULL);

  private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
      {
        gchar *glyphs;
        int glyphs_len;

        if (_gdk_font_wc_to_glyphs (font, text, text_length,
                                    &glyphs, &glyphs_len))
          {
            gdk_text_extents (font, glyphs, glyphs_len,
                              lbearing, rbearing, width, ascent, descent);
            g_free (glyphs);
          }
        else
          {
            if (lbearing)
              *lbearing = 0;
            if (rbearing)
              *rbearing = 0;
            if (width)
              *width = 0;
            if (ascent)
              *ascent = 0;
            if (descent)
              *descent = 0;
          }

        break;
      }
    case GDK_FONT_FONTSET:
      fontset = (XFontSet) private->xfont;

      if (sizeof(GdkWChar) == sizeof(wchar_t))
        XwcTextExtents (fontset, (wchar_t *)text, text_length, &ink, &logical);
      else
        {
          wchar_t *text_wchar;
          gint i;
          
          text_wchar = g_new (wchar_t, text_length);
          for (i = 0; i < text_length; i++)
            text_wchar[i] = text[i];
          XwcTextExtents (fontset, text_wchar, text_length, &ink, &logical);
          g_free (text_wchar);
        }
      if (lbearing)
        *lbearing = ink.x;
      if (rbearing)
        *rbearing = ink.x + ink.width;
      if (width)
        *width = logical.width;
      if (ascent)
        *ascent = -ink.y;
      if (descent)
        *descent = ink.y + ink.height;
      break;
    }

}

void
gdk_string_extents (GdkFont     *font,
                    const gchar *string,
                    gint        *lbearing,
                    gint        *rbearing,
                    gint        *width,
                    gint        *ascent,
                    gint        *descent)
{
  g_return_if_fail (font != NULL);
  g_return_if_fail (string != NULL);

  gdk_text_extents (font, string, strlen (string),
                    lbearing, rbearing, width, ascent, descent);
}


gint
gdk_text_measure (GdkFont     *font,
                  const gchar *text,
                  gint         text_length)
{
  GdkFontPrivate *private;
  XCharStruct overall;
  XFontStruct *xfont;
  XFontSet    fontset;
  XRectangle  ink, log;
  int direction;
  int font_ascent;
  int font_descent;
  gint width;

  g_return_val_if_fail (font != NULL, -1);
  g_return_val_if_fail (text != NULL, -1);

  private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
      xfont = (XFontStruct *) private->xfont;
      if ((xfont->min_byte1 == 0) && (xfont->max_byte1 == 0))
        {
          XTextExtents (xfont, text, text_length,
                        &direction, &font_ascent, &font_descent,
                        &overall);
        }
      else
        {
          XTextExtents16 (xfont, (XChar2b *) text, text_length / 2,
                          &direction, &font_ascent, &font_descent,
                          &overall);
        }
      width = overall.rbearing;
      break;
    case GDK_FONT_FONTSET:
      fontset = (XFontSet) private->xfont;
      XmbTextExtents (fontset, text, text_length, &ink, &log);
      width = ink.x + ink.width;
      break;
    default:
      width = 0;
    }
  return width;
}

gint
gdk_char_measure (GdkFont *font,
                  gchar    character)
{
  g_return_val_if_fail (font != NULL, -1);

  return gdk_text_measure (font, &character, 1);
}

gint
gdk_string_height (GdkFont     *font,
                   const gchar *string)
{
  g_return_val_if_fail (font != NULL, -1);
  g_return_val_if_fail (string != NULL, -1);

  return gdk_text_height (font, string, strlen (string));
}

gint
gdk_text_height (GdkFont     *font,
                 const gchar *text,
                 gint         text_length)
{
  GdkFontPrivate *private;
  XCharStruct overall;
  XFontStruct *xfont;
  XFontSet    fontset;
  XRectangle  ink, log;
  int direction;
  int font_ascent;
  int font_descent;
  gint height;

  g_return_val_if_fail (font != NULL, -1);
  g_return_val_if_fail (text != NULL, -1);

  private = (GdkFontPrivate*) font;

  switch (font->type)
    {
    case GDK_FONT_FONT:
      xfont = (XFontStruct *) private->xfont;
      if ((xfont->min_byte1 == 0) && (xfont->max_byte1 == 0))
        {
          XTextExtents (xfont, text, text_length,
                        &direction, &font_ascent, &font_descent,
                        &overall);
        }
      else
        {
          XTextExtents16 (xfont, (XChar2b *) text, text_length / 2,
                          &direction, &font_ascent, &font_descent,
                          &overall);
        }
      height = overall.ascent + overall.descent;
      break;
    case GDK_FONT_FONTSET:
      fontset = (XFontSet) private->xfont;
      XmbTextExtents (fontset, text, text_length, &ink, &log);
      height = log.height;
      break;
    default:
      height = 0;
    }
  return height;
}

gint
gdk_char_height (GdkFont *font,
                 gchar    character)
{
  g_return_val_if_fail (font != NULL, -1);

  return gdk_text_height (font, &character, 1);
}

gboolean
_gdk_font_wc_to_glyphs (GdkFont        *font,
                        const GdkWChar *text,
                        gint            text_length,
                        gchar         **result,
                        gint           *result_length)
{
  XFontStruct *xfont;
  GdkFontPrivate *font_private = (GdkFontPrivate*) font;

  g_return_val_if_fail (font != NULL, FALSE);
  g_return_val_if_fail (font->type == GDK_FONT_FONT, FALSE);

  xfont = (XFontStruct *) font_private->xfont;

  if (FONT_IS_8BIT (font_private))
    {
      /* 8-bit font, assume that we are in a 8-bit locale,
       * and convert to bytes using wcstombs.
       */
      char *mbstr = _gdk_wcstombs_len (text, text_length);

      if (result_length)
        *result_length = mbstr ? strlen (mbstr) : 0;

      if (result)
        *result = mbstr;
      else
        g_free (mbstr);

      return mbstr != NULL;
    }
  else
    {
      /* 16-bit font. Who knows what was intended? Make a random
       * guess.
       */
      XChar2b *result2b = g_new (XChar2b, text_length + 1);
      gint i;

      for (i = 0; i < text_length; i++)
        {
          result2b[i].byte1 = text[i] / 256;
          result2b[i].byte2 = text[i] % 256;
        }

      result2b[i].byte1 = result2b[i].byte2 = 0;

      if (result)
        *result = (gchar *)result2b;

      if (result_length)
        *result_length = text_length;

      return TRUE;
    }
}