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/* GtkIconTheme - a loader for icon themes
 * gtk-icon-theme.c Copyright (C) 2002, 2003 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.
 */

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#include "config.h"

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#include <sys/types.h>
#include <sys/stat.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <string.h>
#include <stdlib.h>
#include <glib.h>
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#include <glib/gstdio.h>
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#include "gtkalias.h"
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#ifdef G_OS_WIN32
#ifndef S_ISDIR
#define S_ISDIR(mode) ((mode)&_S_IFDIR)
#endif
#endif /* G_OS_WIN32 */

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#include "gtkicontheme.h"
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#include "gtkiconfactory.h"
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#include "gtkiconcache.h"
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#include "gtkintl.h"
#include "gtksettings.h"
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#include "gtkprivate.h"
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#define DEFAULT_THEME_NAME "hicolor"

typedef struct _GtkIconData GtkIconData;

typedef enum
{
  ICON_THEME_DIR_FIXED,  
  ICON_THEME_DIR_SCALABLE,  
  ICON_THEME_DIR_THRESHOLD,
  ICON_THEME_DIR_UNTHEMED
} IconThemeDirType;

/* In reverse search order: */
typedef enum
{
  ICON_SUFFIX_NONE = 0,
  ICON_SUFFIX_XPM = 1 << 0,
  ICON_SUFFIX_SVG = 1 << 1,
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  ICON_SUFFIX_PNG = 1 << 2,
  HAS_ICON_FILE = 1 << 3
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} IconSuffix;


struct _GtkIconThemePrivate
{
  guint custom_theme : 1;
  guint is_screen_singleton : 1;
  guint pixbuf_supports_svg : 1;
  
  char *current_theme;
  char **search_path;
  int search_path_len;

  gboolean themes_valid;
  /* A list of all the themes needed to look up icons.
   * In search order, without duplicates
   */
  GList *themes;
  GHashTable *unthemed_icons;
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  GList *unthemed_icons_caches;
  
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  /* Note: The keys of this hashtable are owned by the
   * themedir and unthemed hashtables.
   */
  GHashTable *all_icons;

  /* GdkScreen for the icon theme (may be NULL)
   */
  GdkScreen *screen;
  
  /* time when we last stat:ed for theme changes */
  long last_stat_time;
  GList *dir_mtimes;
};

struct _GtkIconInfo
{
  /* Information about the source
   */
  gchar *filename;
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#ifdef G_OS_WIN32
  /* System codepage version of filename, for DLL ABI backward
   * compatibility functions.
   */
  gchar *cp_filename;
#endif
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  GdkPixbuf *builtin_pixbuf;

  GtkIconData *data;
  
  /* Information about the directory where
   * the source was found
   */
  IconThemeDirType dir_type;
  gint dir_size;
  gint threshold;

  /* Parameters influencing the scaled icon
   */
  gint desired_size;
  gboolean raw_coordinates;

  /* Cached information if we go ahead and try to load
   * the icon.
   */
  GdkPixbuf *pixbuf;
  GError *load_error;
  gdouble scale;
};

typedef struct
{
  char *name;
  char *display_name;
  char *comment;
  char *example;

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  /* Icon caches, per theme directory, key is NULL if
   * no cache exists for that directory
   */
  GHashTable *icon_caches;
  
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  /* In search order */
  GList *dirs;
} IconTheme;

struct _GtkIconData
{
  gboolean has_embedded_rect;
  gint x0, y0, x1, y1;
  
  GdkPoint *attach_points;
  gint n_attach_points;

  gchar *display_name;
};

typedef struct
{
  IconThemeDirType type;
  GQuark context;

  int size;
  int min_size;
  int max_size;
  int threshold;

  char *dir;
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  char *subdir;
  
  GtkIconCache *cache;
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  GHashTable *icons;
  GHashTable *icon_data;
} IconThemeDir;

typedef struct
{
  char *svg_filename;
  char *no_svg_filename;
} UnthemedIcon;

typedef struct
{
  gint size;
  GdkPixbuf *pixbuf;
} BuiltinIcon;

typedef struct 
{
  char *dir;
  time_t mtime; /* 0 == not existing or not a dir */
} IconThemeDirMtime;

static void  gtk_icon_theme_class_init (GtkIconThemeClass    *klass);
static void  gtk_icon_theme_init       (GtkIconTheme         *icon_theme);
static void  gtk_icon_theme_finalize   (GObject              *object);
static void  theme_dir_destroy         (IconThemeDir         *dir);

static void         theme_destroy     (IconTheme        *theme);
static GtkIconInfo *theme_lookup_icon (IconTheme        *theme,
				       const char       *icon_name,
				       int               size,
				       gboolean          allow_svg,
				       gboolean          use_default_icons);
static void         theme_list_icons  (IconTheme        *theme,
				       GHashTable       *icons,
				       GQuark            context);
static void         theme_subdir_load (GtkIconTheme     *icon_theme,
				       IconTheme        *theme,
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				       GKeyFile         *theme_file,
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				       char             *subdir);
static void         do_theme_change   (GtkIconTheme     *icon_theme);

static void  blow_themes               (GtkIconTheme    *icon_themes);

static void  icon_data_free            (GtkIconData          *icon_data);
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static void load_icon_data (IconThemeDir *dir,
			    const char   *path,
			    const char   *name);

static IconSuffix theme_dir_get_icon_suffix (IconThemeDir *dir,
					     const gchar  *icon_name,
					     gboolean     *has_icon_file);

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static GtkIconInfo *icon_info_new             (void);
static GtkIconInfo *icon_info_new_builtin     (BuiltinIcon *icon);

static IconSuffix suffix_from_name (const char *name);

static BuiltinIcon *find_builtin_icon (const gchar *icon_name,
				       gint         size,
				       gint        *min_difference_p,
				       gboolean    *has_larger_p);

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static GObjectClass *parent_class = NULL;

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static guint signal_changed = 0;

static GHashTable *icon_theme_builtin_icons;

GType
gtk_icon_theme_get_type (void)
{
  static GType type = 0;

  if (type == 0)
    {
      static const GTypeInfo info =
	{
	  sizeof (GtkIconThemeClass),
	  NULL,           /* base_init */
	  NULL,           /* base_finalize */
	  (GClassInitFunc) gtk_icon_theme_class_init,
	  NULL,           /* class_finalize */
	  NULL,           /* class_data */
	  sizeof (GtkIconTheme),
	  0,              /* n_preallocs */
	  (GInstanceInitFunc) gtk_icon_theme_init,
	};

      type = g_type_register_static (G_TYPE_OBJECT, "GtkIconTheme", &info, 0);
    }

  return type;
}

/**
 * gtk_icon_theme_new:
 * 
 * Creates a new icon theme object. Icon theme objects are used
 * to lookup up an icon by name in a particular icon theme.
 * Usually, you'll want to use gtk_icon_theme_get_default()
 * or gtk_icon_theme_get_for_screen() rather than creating
 * a new icon theme object for scratch.
 * 
 * Return value: the newly created #GtkIconTheme object.
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 *
 * Since: 2.4
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 **/
GtkIconTheme *
gtk_icon_theme_new (void)
{
  return g_object_new (GTK_TYPE_ICON_THEME, NULL);
}

/**
 * gtk_icon_theme_get_default:
 * 
 * Gets the icon theme for the default screen. See
 * gtk_icon_theme_get_for_screen().
 * 
 * Return value: A unique #GtkIconTheme associated with
 *  the default screen. This icon theme is associated with
 *  the screen and can be used as long as the screen
 *  is open.
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 *
 * Since: 2.4
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 **/
GtkIconTheme *
gtk_icon_theme_get_default (void)
{
  return gtk_icon_theme_get_for_screen (gdk_screen_get_default ());
}

/**
 * gtk_icon_theme_get_for_screen:
 * @screen: a #GdkScreen
 * 
 * Gets the icon theme object associated with @screen; if this
 * function has not previously been called for the given
 * screen, a new icon theme object will be created and
 * associated with the screen. Icon theme objects are
 * fairly expensive to create, so using this function
 * is usually a better choice than calling than gtk_icon_theme_new()
 * and setting the screen yourself; by using this function
 * a single icon theme object will be shared between users.
 * 
 * Return value: A unique #GtkIconTheme associated with
 *  the given screen. This icon theme is associated with
 *  the screen and can be used as long as the screen
 *  is open.
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 *
 * Since: 2.4
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 **/
GtkIconTheme *
gtk_icon_theme_get_for_screen (GdkScreen *screen)
{
  GtkIconTheme *icon_theme;

  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
  g_return_val_if_fail (!screen->closed, NULL);

  icon_theme = g_object_get_data (G_OBJECT (screen), "gtk-icon-theme");
  if (!icon_theme)
    {
      GtkIconThemePrivate *priv;

      icon_theme = gtk_icon_theme_new ();
      gtk_icon_theme_set_screen (icon_theme, screen);

      priv = icon_theme->priv;
      priv->is_screen_singleton = TRUE;

      g_object_set_data (G_OBJECT (screen), "gtk-icon-theme", icon_theme);
    }

  return icon_theme;
}

static void
gtk_icon_theme_class_init (GtkIconThemeClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

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  parent_class = g_type_class_peek_parent (klass);

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  gobject_class->finalize = gtk_icon_theme_finalize;

/**
 * GtkIconTheme::changed
 * @icon_theme: the icon theme
 * 
 * Emitted when the current icon theme is switched or GTK+ detects
 * that a change has occurred in the contents of the current
 * icon theme.
 **/
  signal_changed = g_signal_new ("changed",
				 G_TYPE_FROM_CLASS (klass),
				 G_SIGNAL_RUN_LAST,
				 G_STRUCT_OFFSET (GtkIconThemeClass, changed),
				 NULL, NULL,
				 g_cclosure_marshal_VOID__VOID,
				 G_TYPE_NONE, 0);

  g_type_class_add_private (klass, sizeof (GtkIconThemePrivate));
}


/* Callback when the display that the icon theme is attached to
 * is closed; unset the screen, and if it's the unique theme
 * for the screen, drop the reference
 */
static void
display_closed (GdkDisplay   *display,
		gboolean      is_error,
		GtkIconTheme *icon_theme)
{
  GtkIconThemePrivate *priv = icon_theme->priv;
  GdkScreen *screen = priv->screen;
  gboolean was_screen_singleton = priv->is_screen_singleton;

  if (was_screen_singleton)
    {
      g_object_set_data (G_OBJECT (screen), "gtk-icon-theme", NULL);
      priv->is_screen_singleton = FALSE;
    }

  gtk_icon_theme_set_screen (icon_theme, NULL);

  if (was_screen_singleton)
    {
      g_object_unref (icon_theme);
    }
}

static void
update_current_theme (GtkIconTheme *icon_theme)
{
  GtkIconThemePrivate *priv = icon_theme->priv;

  if (!priv->custom_theme)
    {
      gchar *theme = NULL;

      if (priv->screen)
	{
	  GtkSettings *settings = gtk_settings_get_for_screen (priv->screen);
	  g_object_get (settings, "gtk-icon-theme-name", &theme, NULL);
	}

      if (!theme)
	theme = g_strdup (DEFAULT_THEME_NAME);

      if (strcmp (priv->current_theme, theme) != 0)
	{
	  g_free (priv->current_theme);
	  priv->current_theme = theme;

	  do_theme_change (icon_theme);
	}
      else
	g_free (theme);
    }
}

/* Callback when the icon theme GtkSetting changes
 */
static void
theme_changed (GtkSettings  *settings,
	       GParamSpec   *pspec,
	       GtkIconTheme *icon_theme)
{
  update_current_theme (icon_theme);
}

static void
unset_screen (GtkIconTheme *icon_theme)
{
  GtkIconThemePrivate *priv = icon_theme->priv;
  GtkSettings *settings;
  GdkDisplay *display;
  
  if (priv->screen)
    {
      settings = gtk_settings_get_for_screen (priv->screen);
      display = gdk_screen_get_display (priv->screen);
      
      g_signal_handlers_disconnect_by_func (display,
					    (gpointer) display_closed,
					    icon_theme);
      g_signal_handlers_disconnect_by_func (settings,
					    (gpointer) theme_changed,
					    icon_theme);

      priv->screen = NULL;
    }
}

/**
 * gtk_icon_theme_set_screen:
 * @icon_theme: a #GtkIconTheme
 * @screen: a #GdkScreen
 * 
 * Sets the screen for an icon theme; the screen is used
 * to track the user's currently configured icon theme,
 * which might be different for different screens.
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 *
 * Since: 2.4
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 **/
void
gtk_icon_theme_set_screen (GtkIconTheme *icon_theme,
			   GdkScreen    *screen)
{
  GtkIconThemePrivate *priv;
  GtkSettings *settings;
  GdkDisplay *display;

  g_return_if_fail (GTK_ICON_THEME (icon_theme));
  g_return_if_fail (screen == NULL || GDK_IS_SCREEN (screen));

  priv = icon_theme->priv;

  unset_screen (icon_theme);
  
  if (screen)
    {
      display = gdk_screen_get_display (screen);
      settings = gtk_settings_get_for_screen (screen);
      
      priv->screen = screen;
      
      g_signal_connect (display, "closed",
			G_CALLBACK (display_closed), icon_theme);
      g_signal_connect (settings, "notify::gtk-icon-theme-name",
			G_CALLBACK (theme_changed), icon_theme);
    }

  update_current_theme (icon_theme);
}

/* Checks whether a loader for SVG files has been registered
 * with GdkPixbuf.
 */
static gboolean
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pixbuf_supports_svg (void)
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{
  GSList *formats = gdk_pixbuf_get_formats ();
  GSList *tmp_list;
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  static gboolean found_svg = FALSE;
  static gboolean value_known = FALSE;
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  if (value_known)
    return found_svg;
  
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  for (tmp_list = formats; tmp_list && !found_svg; tmp_list = tmp_list->next)
    {
      gchar **mime_types = gdk_pixbuf_format_get_mime_types (tmp_list->data);
      gchar **mime_type;
      
      for (mime_type = mime_types; *mime_type && !found_svg; mime_type++)
	{
	  if (strcmp (*mime_type, "image/svg") == 0)
	    found_svg = TRUE;
	}

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      g_strfreev (mime_types);
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    }

  g_slist_free (formats);
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  value_known = TRUE;
  
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  return found_svg;
}

static void
gtk_icon_theme_init (GtkIconTheme *icon_theme)
{
  GtkIconThemePrivate *priv;
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  const gchar * const *xdg_data_dirs;
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  int i, j;
  
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  priv = g_type_instance_get_private ((GTypeInstance *)icon_theme,
				      GTK_TYPE_ICON_THEME);
  icon_theme->priv = priv;

  priv->custom_theme = FALSE;
  priv->current_theme = g_strdup (DEFAULT_THEME_NAME);
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  xdg_data_dirs = g_get_system_data_dirs ();
  for (i = 0; xdg_data_dirs[i]; i++) ;

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  priv->search_path_len = 2 * i + 2;
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  priv->search_path = g_new (char *, priv->search_path_len);
  
  i = 0;
  priv->search_path[i++] = g_build_filename (g_get_home_dir (), ".icons", NULL);
  priv->search_path[i++] = g_build_filename (g_get_user_data_dir (), "icons", NULL);
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  for (j = 0; xdg_data_dirs[j]; j++) 
    priv->search_path[i++] = g_build_filename (xdg_data_dirs[j], "icons", NULL);
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  for (j = 0; xdg_data_dirs[j]; j++) 
    priv->search_path[i++] = g_build_filename (xdg_data_dirs[j], "pixmaps", NULL);
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  priv->themes_valid = FALSE;
  priv->themes = NULL;
  priv->unthemed_icons = NULL;
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  priv->unthemed_icons_caches = NULL;
  
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  priv->pixbuf_supports_svg = pixbuf_supports_svg ();
}

static void
free_dir_mtime (IconThemeDirMtime *dir_mtime)
{
  g_free (dir_mtime->dir);
  g_free (dir_mtime);
}

static void
do_theme_change (GtkIconTheme *icon_theme)
{
  GtkIconThemePrivate *priv = icon_theme->priv;
  
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  GTK_NOTE (ICONTHEME, 
	    g_print ("change to icon theme \"%s\"\n", priv->current_theme));
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  blow_themes (icon_theme);
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  g_signal_emit (icon_theme, signal_changed, 0);
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  if (priv->screen && priv->is_screen_singleton)
    {
      GtkSettings *settings = gtk_settings_get_for_screen (priv->screen);
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      gtk_rc_reset_styles (settings);
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    }
}

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static void 
free_cache (gpointer data, 
	    gpointer user_data)
{
  GtkIconCache *cache = (GtkIconCache *)data;

  if (cache)
    _gtk_icon_cache_unref (cache);
}

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static void
blow_themes (GtkIconTheme *icon_theme)
{
  GtkIconThemePrivate *priv = icon_theme->priv;
  
  if (priv->themes_valid)
    {
      g_hash_table_destroy (priv->all_icons);
      g_list_foreach (priv->themes, (GFunc)theme_destroy, NULL);
      g_list_free (priv->themes);
      g_list_foreach (priv->dir_mtimes, (GFunc)free_dir_mtime, NULL);
      g_list_free (priv->dir_mtimes);
      g_hash_table_destroy (priv->unthemed_icons);
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      if (priv->unthemed_icons_caches)
	g_list_foreach (priv->unthemed_icons_caches, free_cache, NULL);
      g_list_free (priv->unthemed_icons_caches);
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    }
  priv->themes = NULL;
  priv->unthemed_icons = NULL;
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  priv->unthemed_icons_caches = NULL;
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  priv->dir_mtimes = NULL;
  priv->all_icons = NULL;
  priv->themes_valid = FALSE;
}

static void
gtk_icon_theme_finalize (GObject *object)
{
  GtkIconTheme *icon_theme;
  GtkIconThemePrivate *priv;
  int i;

  icon_theme = GTK_ICON_THEME (object);
  priv = icon_theme->priv;

  unset_screen (icon_theme);

  g_free (priv->current_theme);
  priv->current_theme = NULL;

  for (i=0; i < priv->search_path_len; i++)
    g_free (priv->search_path[i]);

  g_free (priv->search_path);
  priv->search_path = NULL;

  blow_themes (icon_theme);
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  G_OBJECT_CLASS (parent_class)->finalize (object);  
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}

/**
 * gtk_icon_theme_set_search_path:
 * @icon_theme: a #GtkIconTheme
 * @path: array of directories that are searched for icon themes
 * @n_elements: number of elements in @path.
 * 
 * Sets the search path for the icon theme object. When looking
 * for an icon theme, GTK+ will search for a subdirectory of
 * one or more of the directories in @path with the same name
 * as the icon theme. (Themes from multiple of the path elements
 * are combined to allow themes to be extended by adding icons
 * in the user's home directory.)
 *
 * In addition if an icon found isn't found either in the current
 * icon theme or the default icon theme, and an image file with
 * the right name is found directly in one of the elements of
 * @path, then that image will be used for the icon name.
 * (This is legacy feature, and new icons should be put
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 * into the default icon theme, which is called DEFAULT_THEME_NAME,
 * rather than directly on the icon path.)
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 *
 * Since: 2.4
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 **/
void
gtk_icon_theme_set_search_path (GtkIconTheme *icon_theme,
				const gchar  *path[],
				gint          n_elements)
{
  GtkIconThemePrivate *priv;
  gint i;

  g_return_if_fail (GTK_IS_ICON_THEME (icon_theme));

  priv = icon_theme->priv;
  for (i = 0; i < priv->search_path_len; i++)
    g_free (priv->search_path[i]);

  g_free (priv->search_path);

  priv->search_path = g_new (gchar *, n_elements);
  priv->search_path_len = n_elements;
  for (i = 0; i < priv->search_path_len; i++)
    priv->search_path[i] = g_strdup (path[i]);

  do_theme_change (icon_theme);
}


/**
 * gtk_icon_theme_get_search_path:
 * @icon_theme: a #GtkIconTheme
 * @path: location to store a list of icon theme path directories or %NULL
 *        The stored value should be freed with g_strfreev().
 * @n_elements: location to store number of elements
 *              in @path, or %NULL
 * 
 * Gets the current search path. See gtk_icon_theme_set_search_path().
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 *
 * Since: 2.4
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 **/
void
gtk_icon_theme_get_search_path (GtkIconTheme      *icon_theme,
				gchar            **path[],
				gint              *n_elements)
{
  GtkIconThemePrivate *priv;
  int i;

  g_return_if_fail (GTK_IS_ICON_THEME (icon_theme));

  priv = icon_theme->priv;

  if (n_elements)
    *n_elements = priv->search_path_len;
  
  if (path)
    {
      *path = g_new (gchar *, priv->search_path_len + 1);
      for (i = 0; i < priv->search_path_len; i++)
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	(*path)[i] = g_strdup (priv->search_path[i]);
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      (*path)[i] = NULL;
    }
}

/**
 * gtk_icon_theme_append_search_path:
 * @icon_theme: a #GtkIconTheme
 * @path: directory name to append to the icon path
 * 
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 * Appends a directory to the search path. 
 * See gtk_icon_theme_set_search_path(). 
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 *
 * Since: 2.4
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 **/
void
gtk_icon_theme_append_search_path (GtkIconTheme *icon_theme,
				   const gchar  *path)
{
  GtkIconThemePrivate *priv;

  g_return_if_fail (GTK_IS_ICON_THEME (icon_theme));
  g_return_if_fail (path != NULL);

  priv = icon_theme->priv;
  
  priv->search_path_len++;
  priv->search_path = g_renew (gchar *, priv->search_path, priv->search_path_len);
  priv->search_path[priv->search_path_len-1] = g_strdup (path);

  do_theme_change (icon_theme);
}

/**
 * gtk_icon_theme_prepend_search_path:
 * @icon_theme: a #GtkIconTheme
 * @path: directory name to prepend to the icon path
 * 
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 * Prepends a directory to the search path. 
 * See gtk_icon_theme_set_search_path().
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 *
 * Since: 2.4
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 **/
void
gtk_icon_theme_prepend_search_path (GtkIconTheme *icon_theme,
				    const gchar  *path)
{
  GtkIconThemePrivate *priv;
  int i;

  g_return_if_fail (GTK_IS_ICON_THEME (icon_theme));
  g_return_if_fail (path != NULL);

  priv = icon_theme->priv;
  
  priv->search_path_len++;
  priv->search_path = g_renew (gchar *, priv->search_path, priv->search_path_len);

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  for (i = priv->search_path_len - 1; i > 0; i--)
    priv->search_path[i] = priv->search_path[i - 1];
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  priv->search_path[0] = g_strdup (path);

  do_theme_change (icon_theme);
}

/**
 * gtk_icon_theme_set_custom_theme:
 * @icon_theme: a #GtkIconTheme
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 * @theme_name: name of icon theme to use instead of configured theme,
 *   or %NULL to unset a previously set custom theme
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 * 
 * Sets the name of the icon theme that the #GtkIconTheme object uses
 * overriding system configuration. This function cannot be called
 * on the icon theme objects returned from gtk_icon_theme_get_default()
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 * and gtk_icon_theme_get_for_screen().
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 *
 * Since: 2.4
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 **/
void
gtk_icon_theme_set_custom_theme (GtkIconTheme *icon_theme,
				 const gchar  *theme_name)
{
  GtkIconThemePrivate *priv;

  g_return_if_fail (GTK_IS_ICON_THEME (icon_theme));

  priv = icon_theme->priv;

  g_return_if_fail (!priv->is_screen_singleton);
  
  if (theme_name != NULL)
    {
      priv->custom_theme = TRUE;
      if (strcmp (theme_name, priv->current_theme) != 0)
	{
	  g_free (priv->current_theme);
	  priv->current_theme = g_strdup (theme_name);

	  do_theme_change (icon_theme);
	}
    }
  else
    {
      priv->custom_theme = FALSE;

      update_current_theme (icon_theme);
    }
}

static void
insert_theme (GtkIconTheme *icon_theme, const char *theme_name)
{
  int i;
  GList *l;
  char **dirs;
  char **themes;
  GtkIconThemePrivate *priv;
  IconTheme *theme;
  char *path;
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  GKeyFile *theme_file;
  GError *error = NULL;
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  IconThemeDirMtime *dir_mtime;
  struct stat stat_buf;
  
  priv = icon_theme->priv;
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  for (l = priv->themes; l != NULL; l = l->next)
    {
      theme = l->data;
      if (strcmp (theme->name, theme_name) == 0)
	return;
    }
  
  for (i = 0; i < priv->search_path_len; i++)
    {
      path = g_build_filename (priv->search_path[i],
			       theme_name,
			       NULL);
      dir_mtime = g_new (IconThemeDirMtime, 1);
      dir_mtime->dir = path;
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      if (g_stat (path, &stat_buf) == 0 && S_ISDIR (stat_buf.st_mode))
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	dir_mtime->mtime = stat_buf.st_mtime;
      else
	dir_mtime->mtime = 0;

      priv->dir_mtimes = g_list_prepend (priv->dir_mtimes, dir_mtime);
    }
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  priv->dir_mtimes = g_list_reverse (priv->dir_mtimes);
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  theme_file = NULL;
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  for (i = 0; i < priv->search_path_len && !theme_file; i++)
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    {
      path = g_build_filename (priv->search_path[i],
			       theme_name,
			       "index.theme",
			       NULL);
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      if (g_file_test (path, G_FILE_TEST_IS_REGULAR)) 
	{
	  theme_file = g_key_file_new ();
	  g_key_file_set_list_separator (theme_file, ',');
	  g_key_file_load_from_file (theme_file, path, 0, &error);
	  if (error)
	    {
	      g_key_file_free (theme_file);
	      theme_file = NULL;
	      g_error_free (error);
	      error = NULL;
	    }
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	}
      g_free (path);
    }

  if (theme_file == NULL)
    return;
  
  theme = g_new (IconTheme, 1);
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  theme->display_name = 
    g_key_file_get_locale_string (theme_file, "Icon Theme", "Name", NULL, NULL);
  if (!theme->display_name)
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    {
      g_warning ("Theme file for %s has no name\n", theme_name);
      g_free (theme);
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      g_key_file_free (theme_file);
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      return;
    }

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  dirs = g_key_file_get_string_list (theme_file, "Icon Theme", "Directories", NULL, NULL);
  if (!dirs)
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    {
      g_warning ("Theme file for %s has no directories\n", theme_name);
      g_free (theme->display_name);
      g_free (theme);
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      g_key_file_free (theme_file);
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      return;
    }
  
  theme->name = g_strdup (theme_name);
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  theme->comment = 
    g_key_file_get_locale_string (theme_file, 
				  "Icon Theme", "Comment",
				  NULL, NULL);
  theme->example = 
    g_key_file_get_string (theme_file, 
			   "Icon Theme", "Example",
			   NULL);
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  theme->icon_caches = NULL;
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  theme->dirs = NULL;
  for (i = 0; dirs[i] != NULL; i++)
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    theme_subdir_load (icon_theme, theme, theme_file, dirs[i]);
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  g_strfreev (dirs);
  
  theme->dirs = g_list_reverse (theme->dirs);

  /* Prepend the finished theme */
  priv->themes = g_list_prepend (priv->themes, theme);

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  themes = g_key_file_get_string_list (theme_file,
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				       "Icon Theme",
				       "Inherits",
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				       NULL,
				       NULL);
  if (themes)
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    {
      for (i = 0; themes[i] != NULL; i++)
	insert_theme (icon_theme, themes[i]);
      
      g_strfreev (themes);
    }

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  g_key_file_free (theme_file);
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}

static void
free_unthemed_icon (UnthemedIcon *unthemed_icon)
{
  if (unthemed_icon->svg_filename)
    g_free (unthemed_icon->svg_filename);
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  if (unthemed_icon->no_svg_filename)
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    g_free (unthemed_icon->no_svg_filename);
  g_free (unthemed_icon);
}

static void
load_themes (GtkIconTheme *icon_theme)
{
  GtkIconThemePrivate *priv;
  GDir *gdir;
  int base;
  char *dir, *base_name, *dot;
  const char *file;
  char *abs_file;
  UnthemedIcon *unthemed_icon;
  IconSuffix old_suffix, new_suffix;
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  GTimeVal tv;
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  priv = icon_theme->priv;

  priv->all_icons = g_hash_table_new (g_str_hash, g_str_equal);
  
  insert_theme (icon_theme, priv->current_theme);
  
  /* Always look in the "default" icon theme */
  insert_theme (icon_theme, DEFAULT_THEME_NAME);
  priv->themes = g_list_reverse (priv->themes);
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  priv->unthemed_icons = g_hash_table_new_full (g_str_hash, g_str_equal,
						g_free, (GDestroyNotify)free_unthemed_icon);

  for (base = 0; base < icon_theme->priv->search_path_len; base++)
    {
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      GtkIconCache *cache;
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      dir = icon_theme->priv->search_path[base];
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      cache = _gtk_icon_cache_new_for_path (dir);

      if (cache != NULL)
	{
	  priv->unthemed_icons_caches = g_list_prepend (priv->unthemed_icons_caches, cache);

	  continue;
	}
	   
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      gdir = g_dir_open (dir, 0, NULL);

      if (gdir == NULL)
	continue;
      
      while ((file = g_dir_read_name (gdir)))
	{
	  new_suffix = suffix_from_name (file);

	  if (new_suffix != ICON_SUFFIX_NONE)
	    {
	      abs_file = g_build_filename (dir, file, NULL);

	      base_name = g_strdup (file);
		  
	      dot = strrchr (base_name, '.');
	      if (dot)
		*dot = 0;

	      if ((unthemed_icon = g_hash_table_lookup (priv->unthemed_icons,
							base_name)))
		{
		  if (new_suffix == ICON_SUFFIX_SVG)
		    {
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		      if (unthemed_icon->svg_filename)
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			g_free (abs_file);
		      else
			unthemed_icon->svg_filename = abs_file;
		    }
		  else
		    {
		      if (unthemed_icon->no_svg_filename)
			{
			  old_suffix = suffix_from_name (unthemed_icon->no_svg_filename);
			  if (new_suffix > old_suffix)
			    {
			      g_free (unthemed_icon->no_svg_filename);
			      unthemed_icon->no_svg_filename = abs_file;			      
			    }
			  else
			    g_free (abs_file);
			}
		      else
			unthemed_icon->no_svg_filename = abs_file;			      
		    }

		  g_free (base_name);
		}
	      else
		{
		  unthemed_icon = g_new0 (UnthemedIcon, 1);
		  
		  if (new_suffix == ICON_SUFFIX_SVG)
		    unthemed_icon->svg_filename = abs_file;
		  else
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		    unthemed_icon->no_svg_filename = abs_file;
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		  g_hash_table_insert (priv->unthemed_icons,
				       base_name,
				       unthemed_icon);
		  g_hash_table_insert (priv->all_icons,
				       base_name, NULL);
		}
	    }
	}
      g_dir_close (gdir);
    }

  priv->themes_valid = TRUE;
  
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  g_get_current_time(&tv);
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  priv->last_stat_time = tv.tv_sec;
}

static void
ensure_valid_themes (GtkIconTheme *icon_theme)
{
  GtkIconThemePrivate *priv = icon_theme->priv;
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  GTimeVal tv;
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  if (priv->themes_valid)
    {
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      g_get_current_time (&tv);
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      if (ABS (tv.tv_sec - priv->last_stat_time) > 5)
	gtk_icon_theme_rescan_if_needed (icon_theme);
    }
  
  if (!priv->themes_valid)
    load_themes (icon_theme);
}

/**
 * gtk_icon_theme_lookup_icon:
 * @icon_theme: a #GtkIconTheme
 * @icon_name: the name of the icon to lookup
 * @size: desired icon size
 * @flags: flags modifying the behavior of the icon lookup
 * 
 * Looks up a named icon and returns a structure containing
 * information such as the filename of the icon. The icon
 * can then be rendered into a pixbuf using
 * gtk_icon_info_load_icon(). (gtk_icon_theme_load_icon()
 * combines these two steps if all you need is the pixbuf.)
 * 
 * Return value: a #GtkIconInfo structure containing information
 * about the icon, or %NULL if the icon wasn't found. Free with
 * gtk_icon_info_free()
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 *
 * Since: 2.4
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 **/
GtkIconInfo *
gtk_icon_theme_lookup_icon (GtkIconTheme       *icon_theme,
			    const gchar        *icon_name,
			    gint                size,
			    GtkIconLookupFlags  flags)
{
  GtkIconThemePrivate *priv;
  GList *l;
  GtkIconInfo *icon_info = NULL;
  UnthemedIcon *unthemed_icon;
  gboolean allow_svg;
  gboolean use_builtin;
  gboolean found_default;

  g_return_val_if_fail (GTK_IS_ICON_THEME (icon_theme), NULL);
  g_return_val_if_fail (icon_name != NULL, NULL);
  g_return_val_if_fail ((flags & GTK_ICON_LOOKUP_NO_SVG) == 0 ||
			(flags & GTK_ICON_LOOKUP_FORCE_SVG) == 0, NULL);
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  priv = icon_theme->priv;

  if (flags & GTK_ICON_LOOKUP_NO_SVG)
    allow_svg = FALSE;
  else if (flags & GTK_ICON_LOOKUP_FORCE_SVG)
    allow_svg = TRUE;
  else
    allow_svg = priv->pixbuf_supports_svg;

  use_builtin = (flags & GTK_ICON_LOOKUP_USE_BUILTIN);

  ensure_valid_themes (icon_theme);

  found_default = FALSE;
  l = priv->themes;
  while (l != NULL)
    {
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      IconTheme *theme = l->data;
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      if (strcmp (theme->name, DEFAULT_THEME_NAME) == 0)
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	found_default = TRUE;
      
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      icon_info = theme_lookup_icon (theme, icon_name, size, allow_svg, use_builtin);
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      if (icon_info)
	goto out;
      
      l = l->next;
    }

  if (!found_default)
    {
      BuiltinIcon *builtin = find_builtin_icon (icon_name, size, NULL, NULL);
      if (builtin)
	{
	  icon_info = icon_info_new_builtin (builtin);
	  goto out;
	}
    }
  
  unthemed_icon = g_hash_table_lookup (priv->unthemed_icons, icon_name);
  if (unthemed_icon)
    {
      icon_info = icon_info_new ();

      /* A SVG icon, when allowed, beats out a XPM icon, but not
       * a PNG icon
       */
      if (allow_svg &&
	  unthemed_icon->svg_filename &&
	  (!unthemed_icon->no_svg_filename ||
	   suffix_from_name (unthemed_icon->no_svg_filename) != ICON_SUFFIX_PNG))
	icon_info->filename = g_strdup (unthemed_icon->svg_filename);
      else if (unthemed_icon->no_svg_filename)
	icon_info->filename = g_strdup (unthemed_icon->no_svg_filename);
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#ifdef G_OS_WIN32
      icon_info->cp_filename = g_locale_from_utf8 (icon_info->filename,
						   -1, NULL, NULL, NULL);
#endif
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      icon_info->dir_type = ICON_THEME_DIR_UNTHEMED;
    }

 out:
  if (icon_info)
    icon_info->desired_size = size;
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  else
    {
      static gboolean check_for_default_theme = TRUE;
      char *default_theme_path;
      gboolean found = FALSE;
      unsigned i;

      if (check_for_default_theme)
	{
	  check_for_default_theme = FALSE;

	  for (i = 0; !found && i < priv->search_path_len; i++)
	    {
	      default_theme_path = g_build_filename (priv->search_path[i],
						     DEFAULT_THEME_NAME,
						     "index.theme",
						     NULL);
	      found = g_file_test (default_theme_path, G_FILE_TEST_IS_REGULAR);
	      g_free (default_theme_path);
	    }
	  if (!found)
	    {
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	      g_warning (_("Could not find the icon '%s'. The '%s' theme\n"
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			   "was not found either, perhaps you need to install it.\n"
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			   "You can get a copy from:\n"
			   "\t%s"),
			 icon_name, DEFAULT_THEME_NAME, "http://freedesktop.org/Software/icon-theme/releases");
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	    }
	}
    }
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  return icon_info;
}

/* Error quark */
GQuark
gtk_icon_theme_error_quark (void)
{
  static GQuark q = 0;
  if (q == 0)
    q = g_quark_from_static_string ("gtk-icon-theme-error-quark");

  return q;
}

/**
 * gtk_icon_theme_load_icon:
 * @icon_theme: a #GtkIconTheme
 * @icon_name: the name of the icon to lookup
 * @size: the desired icon size. The resulting icon may not be
 *        exactly this size; see gtk_icon_info_load_icon().
 * @flags: flags modifying the behavior of the icon lookup
 * @error: Location to store error information on failure, or %NULL.
 * 
 * Looks up an icon in an icon theme, scales it to the given size
 * and renders it into a pixbuf. This is a convenience function;
 * if more details about the icon are needed, use
 * gtk_icon_theme_lookup_icon() followed by gtk_icon_info_load_icon().
 * 
 * Return value: the rendered icon; this may be a newly created icon
 *  or a new reference to an internal icon, so you must not modify
 *  the icon. Use g_object_unref() to release your reference to the
 *  icon. %NULL if the icon isn't found.
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 *
 * Since: 2.4
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 **/
GdkPixbuf *
gtk_icon_theme_load_icon (GtkIconTheme         *icon_theme,
			  const gchar          *icon_name,
			  gint                  size,
			  GtkIconLookupFlags    flags,
			  GError              **error)
{
  GtkIconInfo *icon_info;
  GdkPixbuf *pixbuf = NULL;
  
  g_return_val_if_fail (GTK_IS_ICON_THEME (icon_theme), NULL);
  g_return_val_if_fail (icon_name != NULL, NULL);
  g_return_val_if_fail ((flags & GTK_ICON_LOOKUP_NO_SVG) == 0 ||
			(flags & GTK_ICON_LOOKUP_FORCE_SVG) == 0, NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
  
  icon_info  = gtk_icon_theme_lookup_icon (icon_theme, icon_name, size,
					   flags | GTK_ICON_LOOKUP_USE_BUILTIN);
  if (!icon_info)
    {
      g_set_error (error, GTK_ICON_THEME_ERROR,  GTK_ICON_THEME_NOT_FOUND,
		   _("Icon '%s' not present in theme"), icon_name);
      return NULL;
    }

  pixbuf = gtk_icon_info_load_icon (icon_info, error);
  gtk_icon_info_free (icon_info);

  return pixbuf;
}

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typedef struct 
{
  const gchar *icon_name;
  gboolean found;
} CacheSearch;

static void
cache_has_icon (gpointer  key,
		gpointer  value,
		gpointer  user_data)
{
  GtkIconCache *cache = (GtkIconCache *)value;
  CacheSearch *search = (CacheSearch *)user_data;

  if (!cache || search->found)
    return;

  if (_gtk_icon_cache_has_icon (cache, search->icon_name))
    search->found = TRUE;  
}

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/**
 * gtk_icon_theme_has_icon:
 * @icon_theme: a #GtkIconTheme
 * @icon_name: the name of an icon
 * 
 * Checks whether an icon theme includes an icon
 * for a particular name.
 * 
 * Return value: %TRUE if @icon_theme includes an
 *  icon for @icon_name.
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 *
 * Since: 2.4
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 **/
gboolean 
gtk_icon_theme_has_icon (GtkIconTheme *icon_theme,
			 const char   *icon_name)
{
  GtkIconThemePrivate *priv;
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  GList *l;
  CacheSearch search;
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  g_return_val_if_fail (GTK_IS_ICON_THEME (icon_theme), FALSE);
  
  priv = icon_theme->priv;
  
  ensure_valid_themes (icon_theme);

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  search.icon_name = icon_name;
  search.found = FALSE;

  for (l = priv->themes; l; l = l->next)
    {
      IconTheme *theme = (IconTheme *)l->data;

      g_hash_table_foreach (theme->icon_caches, cache_has_icon, &search);

      if (search.found)
	return TRUE;
    }

  for (l = priv->unthemed_icons_caches; l; l = l->next)
    {
      GtkIconCache *cache = (GtkIconCache *)l->data;

      if (_gtk_icon_cache_has_icon (cache, icon_name))
	return TRUE;
    }

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  if (g_hash_table_lookup_extended (priv->all_icons,
				    icon_name, NULL, NULL))
    return TRUE;
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  if (icon_theme_builtin_icons &&
      g_hash_table_lookup_extended (icon_theme_builtin_icons,
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				    icon_name, NULL, NULL))
    return TRUE;

  return FALSE;
}

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static void
add_size (gpointer  key,
	  gpointer  value,
	  gpointer  user_data)
{
  gint **res_p = user_data;

  **res_p = GPOINTER_TO_INT (key);

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  (*res_p)++;
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}

/**
 * gtk_icon_theme_get_icon_sizes:
 * @icon_theme: a #GtkIconTheme
 * @icon_name: the name of an icon
 * 
 * Returns an array of integers describing the sizes at which
 * the icon is available without scaling. A size of -1 means 
 * that the icon is available in a scalable format. The array 
 * is zero-terminated.
 * 
 * Return value: An newly allocated array describing the sizes at
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 * which the icon is available. The array should be freed with g_free()
 * when it is no longer needed.
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 *
 * Since: 2.6
 **/
gint *
gtk_icon_theme_get_icon_sizes (GtkIconTheme *icon_theme,
			       const char   *icon_name)
{
  GList *l, *d;
  GHashTable *sizes;
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  gint *result, *r;
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  guint suffix;
  
  GtkIconThemePrivate *priv;

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  g_return_val_if_fail (GTK_IS_ICON_THEME (icon_theme), NULL);
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  priv = icon_theme->priv;

  ensure_valid_themes (icon_theme);

  sizes = g_hash_table_new (g_direct_hash, g_direct_equal);

  for (l = priv->themes; l; l = l->next)
    {
      IconTheme *theme = l->data;
      for (d = theme->dirs; d; d = d->next)
	{
	  IconThemeDir *dir = d->data;
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	  suffix = theme_dir_get_icon_suffix (dir, icon_name, NULL);	  
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	  if (suffix != ICON_SUFFIX_NONE)
	    {
	      if (suffix == ICON_SUFFIX_SVG)
		g_hash_table_insert (sizes, GINT_TO_POINTER (-1), NULL);
	      else
		g_hash_table_insert (sizes, GINT_TO_POINTER (dir->size), NULL);
	    }
	}
    }

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  r = result = g_new0 (gint, g_hash_table_size (sizes) + 1);
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  g_hash_table_foreach (sizes, add_size, &r);
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  g_hash_table_destroy (sizes);
  
  return result;
}
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static void
add_key_to_hash (gpointer  key,
		 gpointer  value,
		 gpointer  user_data)
{
  GHashTable *hash = user_data;

  g_hash_table_insert (hash, key, NULL);
}

static void
add_key_to_list (gpointer  key,
		 gpointer  value,
		 gpointer  user_data)
{
  GList **list = user_data;

  *list = g_list_prepend (*list, g_strdup (key));
}

/**
 * gtk_icon_theme_list_icons:
 * @icon_theme: a #GtkIconTheme
 * @context: a string identifying a particular type of icon,
 *           or %NULL to list all icons.
 * 
 * Lists the icons in the current icon theme. Only a subset
 * of the icons can be listed by providing a context string.
 * The set of values for the context string is system dependent,
 * but will typically include such values as 'apps' and
 * 'mimetypes'.
 * 
 * Return value: a #GList list holding the names of all the
 *  icons in the theme. You must first free each element
 *  in the list with g_free(), then free the list itself
 *  with g_list_free().
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 *
 * Since: 2.4
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 **/
GList *
gtk_icon_theme_list_icons (GtkIconTheme *icon_theme,
			   const char   *context)
{
  GtkIconThemePrivate *priv;
  GHashTable *icons;