st/icon-theme: Copy GTK3 code in-tree

GTK4 changed icon loading significantly, it is now closely tied
to snapshots and paintables. This makes a port highly unrealistic,
so to avoid staying stuck on GTK3 forever, copy the relevant code
into the tree.

The code is unmodified except for the include names and replacing
some stray tab indentation. It is still full of GTK internals, so
it will take a while before we can actually build it.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2620>

po/POTFILES.in

@@ -85,6 +85,7 @@ src/shell-global.c
 src/shell-keyring-prompt.c
 src/shell-polkit-authentication-agent.c
 src/shell-util.c
+src/st/st-icon-theme.c
 subprojects/extensions-app/data/metainfo/org.gnome.Extensions.metainfo.xml.in
 subprojects/extensions-app/data/org.gnome.Extensions.desktop.in.in
 subprojects/extensions-app/js/main.js

src/st/st-icon-cache.c

@@ -0,0 +1,542 @@
+/* gtkiconcache.c
+ * Copyright (C) 2004  Anders Carlsson <andersca@gnome.org>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "st-icon-cache.h"
+
+#include "gtkdebug.h"
+#include "gtkiconcachevalidator.h"
+
+#include <glib/gstdio.h>
+#include <gdk-pixbuf/gdk-pixdata.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef G_OS_WIN32
+#include <io.h>
+#endif
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+
+
+#ifndef _O_BINARY
+#define _O_BINARY 0
+#endif
+
+#define MAJOR_VERSION 1
+#define MINOR_VERSION 0
+
+#define GET_UINT16(cache, offset) (GUINT16_FROM_BE (*(guint16 *)((cache) + (offset))))
+#define GET_UINT32(cache, offset) (GUINT32_FROM_BE (*(guint32 *)((cache) + (offset))))
+
+
+struct _GtkIconCache {
+  gint ref_count;
+
+  GMappedFile *map;
+  gchar *buffer;
+
+  guint32 last_chain_offset;
+};
+
+GtkIconCache *
+_gtk_icon_cache_ref (GtkIconCache *cache)
+{
+  cache->ref_count++;
+  return cache;
+}
+
+void
+_gtk_icon_cache_unref (GtkIconCache *cache)
+{
+  cache->ref_count --;
+
+  if (cache->ref_count == 0)
+    {
+      GTK_NOTE (ICONTHEME, g_message ("unmapping icon cache"));
+
+      if (cache->map)
+        g_mapped_file_unref (cache->map);
+      g_free (cache);
+    }
+}
+
+GtkIconCache *
+_gtk_icon_cache_new_for_path (const gchar *path)
+{
+  GtkIconCache *cache = NULL;
+  GMappedFile *map;
+
+  gchar *cache_filename;
+  gint fd = -1;
+  GStatBuf st;
+  GStatBuf path_st;
+
+   /* Check if we have a cache file */
+  cache_filename = g_build_filename (path, "icon-theme.cache", NULL);
+
+  GTK_NOTE (ICONTHEME, g_message ("look for icon cache in %s", path));
+
+  if (g_stat (path, &path_st) < 0)
+    goto done;
+
+  /* Open the file and map it into memory */
+  fd = g_open (cache_filename, O_RDONLY|_O_BINARY, 0);
+
+  if (fd < 0)
+    goto done;
+
+#ifdef G_OS_WIN32
+
+/* Bug 660730: _fstat32 is only defined in msvcrt80.dll+/VS 2005+ */
+/*             or possibly in the msvcrt.dll linked to by the Windows DDK */
+/*             (will need to check on the Windows DDK part later) */
+#if ((_MSC_VER >= 1400 || __MSVCRT_VERSION__ >= 0x0800) || defined (__MINGW64_VERSION_MAJOR)) && !defined(_WIN64)
+#undef fstat /* Just in case */
+#define fstat _fstat32  
+#elif defined(__MINGW64_VERSION_MAJOR) && defined(_WIN64)
+#undef fstat
+#define fstat _fstat64
+#endif
+#endif
+
+  if (fstat (fd, &st) < 0 || st.st_size < 4)
+    goto done;
+
+  /* Verify cache is uptodate */
+  if (st.st_mtime < path_st.st_mtime)
+    {
+      GTK_NOTE (ICONTHEME, g_message ("icon cache outdated"));
+      goto done;
+    }
+
+  map = g_mapped_file_new (cache_filename, FALSE, NULL);
+
+  if (!map)
+    goto done;
+
+#ifdef G_ENABLE_DEBUG
+  if (GTK_DEBUG_CHECK (ICONTHEME))
+    {
+      CacheInfo info;
+
+      info.cache = g_mapped_file_get_contents (map);
+      info.cache_size = g_mapped_file_get_length (map);
+      info.n_directories = 0;
+      info.flags = CHECK_OFFSETS|CHECK_STRINGS;
+
+      if (!_gtk_icon_cache_validate (&info))
+        {
+          g_mapped_file_unref (map);
+          g_warning ("Icon cache '%s' is invalid", cache_filename);
+
+          goto done;
+        }
+    }
+#endif
+
+  GTK_NOTE (ICONTHEME, g_message ("found icon cache for %s", path));
+
+  cache = g_new0 (GtkIconCache, 1);
+  cache->ref_count = 1;
+  cache->map = map;
+  cache->buffer = g_mapped_file_get_contents (map);
+
+ done:
+  g_free (cache_filename);
+  if (fd >= 0)
+    close (fd);
+
+  return cache;
+}
+
+GtkIconCache *
+_gtk_icon_cache_new (const gchar *data)
+{
+  GtkIconCache *cache;
+
+  cache = g_new0 (GtkIconCache, 1);
+  cache->ref_count = 1;
+  cache->map = NULL;
+  cache->buffer = (gchar *)data;
+
+  return cache;
+}
+
+static gint
+get_directory_index (GtkIconCache *cache,
+                     const gchar *directory)
+{
+  guint32 dir_list_offset;
+  gint n_dirs;
+  gint i;
+
+  dir_list_offset = GET_UINT32 (cache->buffer, 8);
+
+  n_dirs = GET_UINT32 (cache->buffer, dir_list_offset);
+
+  for (i = 0; i < n_dirs; i++)
+    {
+      guint32 name_offset = GET_UINT32 (cache->buffer, dir_list_offset + 4 + 4 * i);
+      gchar *name = cache->buffer + name_offset;
+      if (strcmp (name, directory) == 0)
+        return i;
+    }
+
+  return -1;
+}
+
+gint
+_gtk_icon_cache_get_directory_index (GtkIconCache *cache,
+                                     const gchar *directory)
+{
+  return get_directory_index (cache, directory);
+}
+
+static guint
+icon_name_hash (gconstpointer key)
+{
+  const signed char *p = key;
+  guint32 h = *p;
+
+  if (h)
+    for (p += 1; *p != '\0'; p++)
+      h = (h << 5) - h + *p;
+
+  return h;
+}
+
+static gint
+find_image_offset (GtkIconCache *cache,
+                   const gchar  *icon_name,
+                   gint          directory_index)
+{
+  guint32 hash_offset;
+  guint32 n_buckets;
+  guint32 chain_offset;
+  int hash;
+  guint32 image_list_offset, n_images;
+  int i;
+
+  if (!icon_name)
+    return 0;
+
+  chain_offset = cache->last_chain_offset;
+  if (chain_offset)
+    {
+      guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
+      gchar *name = cache->buffer + name_offset;
+
+      if (strcmp (name, icon_name) == 0)
+        goto find_dir;
+    }
+
+  hash_offset = GET_UINT32 (cache->buffer, 4);
+  n_buckets = GET_UINT32 (cache->buffer, hash_offset);
+  hash = icon_name_hash (icon_name) % n_buckets;
+
+  chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * hash);
+  while (chain_offset != 0xffffffff)
+    {
+      guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
+      gchar *name = cache->buffer + name_offset;
+
+      if (strcmp (name, icon_name) == 0)
+        {
+          cache->last_chain_offset = chain_offset;
+          goto find_dir;
+        }
+
+      chain_offset = GET_UINT32 (cache->buffer, chain_offset);
+    }
+
+  cache->last_chain_offset = 0;
+  return 0;
+
+find_dir:
+  /* We've found an icon list, now check if we have the right icon in it */
+  image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8);
+  n_images = GET_UINT32 (cache->buffer, image_list_offset);
+
+  for (i = 0; i < n_images; i++)
+    {
+      if (GET_UINT16 (cache->buffer, image_list_offset + 4 + 8 * i) ==
+          directory_index)
+        return image_list_offset + 4 + 8 * i;
+    }
+
+  return 0;
+}
+
+gint
+_gtk_icon_cache_get_icon_flags (GtkIconCache *cache,
+                                const gchar  *icon_name,
+                                gint          directory_index)
+{
+  guint32 image_offset;
+
+  image_offset = find_image_offset (cache, icon_name, directory_index);
+
+  if (!image_offset)
+    return 0;
+
+  return GET_UINT16 (cache->buffer, image_offset + 2);
+}
+
+gboolean
+_gtk_icon_cache_has_icons (GtkIconCache *cache,
+                           const gchar  *directory)
+{
+  int directory_index;
+  guint32 hash_offset, n_buckets;
+  guint32 chain_offset;
+  guint32 image_list_offset, n_images;
+  int i, j;
+
+  directory_index = get_directory_index (cache, directory);
+
+  if (directory_index == -1)
+    return FALSE;
+
+  hash_offset = GET_UINT32 (cache->buffer, 4);
+  n_buckets = GET_UINT32 (cache->buffer, hash_offset);
+
+  for (i = 0; i < n_buckets; i++)
+    {
+      chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * i);
+      while (chain_offset != 0xffffffff)
+        {
+          image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8);
+          n_images = GET_UINT32 (cache->buffer, image_list_offset);
+
+          for (j = 0; j < n_images; j++)
+            {
+              if (GET_UINT16 (cache->buffer, image_list_offset + 4 + 8 * j) ==
+                  directory_index)
+                return TRUE;
+            }
+
+          chain_offset = GET_UINT32 (cache->buffer, chain_offset);
+        }
+    }
+
+  return FALSE;
+}
+
+void
+_gtk_icon_cache_add_icons (GtkIconCache *cache,
+                           const gchar  *directory,
+                           GHashTable   *hash_table)
+{
+  int directory_index;
+  guint32 hash_offset, n_buckets;
+  guint32 chain_offset;
+  guint32 image_list_offset, n_images;
+  int i, j;
+
+  directory_index = get_directory_index (cache, directory);
+
+  if (directory_index == -1)
+    return;
+
+  hash_offset = GET_UINT32 (cache->buffer, 4);
+  n_buckets = GET_UINT32 (cache->buffer, hash_offset);
+
+  for (i = 0; i < n_buckets; i++)
+    {
+      chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * i);
+      while (chain_offset != 0xffffffff)
+        {
+          guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
+          gchar *name = cache->buffer + name_offset;
+
+          image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8);
+          n_images = GET_UINT32 (cache->buffer, image_list_offset);
+
+          for (j = 0; j < n_images; j++)
+            {
+              if (GET_UINT16 (cache->buffer, image_list_offset + 4 + 8 * j) ==
+                  directory_index)
+                g_hash_table_insert (hash_table, name, NULL);
+            }
+
+          chain_offset = GET_UINT32 (cache->buffer, chain_offset);
+        }
+    }
+}
+
+gboolean
+_gtk_icon_cache_has_icon (GtkIconCache *cache,
+                          const gchar  *icon_name)
+{
+  guint32 hash_offset;
+  guint32 n_buckets;
+  guint32 chain_offset;
+  gint hash;
+
+  hash_offset = GET_UINT32 (cache->buffer, 4);
+  n_buckets = GET_UINT32 (cache->buffer, hash_offset);
+
+  hash = icon_name_hash (icon_name) % n_buckets;
+
+  chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * hash);
+  while (chain_offset != 0xffffffff)
+    {
+      guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
+      gchar *name = cache->buffer + name_offset;
+
+      if (strcmp (name, icon_name) == 0)
+        return TRUE;
+
+      chain_offset = GET_UINT32 (cache->buffer, chain_offset);
+    }
+
+  return FALSE;
+}
+
+gboolean
+_gtk_icon_cache_has_icon_in_directory (GtkIconCache *cache,
+                                       const gchar  *icon_name,
+                                       const gchar  *directory)
+{
+  guint32 hash_offset;
+  guint32 n_buckets;
+  guint32 chain_offset;
+  gint hash;
+  gboolean found_icon = FALSE;
+  gint directory_index;
+
+  directory_index = get_directory_index (cache, directory);
+
+  if (directory_index == -1)
+    return FALSE;
+
+  hash_offset = GET_UINT32 (cache->buffer, 4);
+  n_buckets = GET_UINT32 (cache->buffer, hash_offset);
+
+  hash = icon_name_hash (icon_name) % n_buckets;
+
+  chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * hash);
+  while (chain_offset != 0xffffffff)
+    {
+      guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
+      gchar *name = cache->buffer + name_offset;
+
+      if (strcmp (name, icon_name) == 0)
+        {
+          found_icon = TRUE;
+          break;
+        }
+
+      chain_offset = GET_UINT32 (cache->buffer, chain_offset);
+    }
+
+  if (found_icon)
+    {
+      guint32 image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8);
+      guint32 n_images =  GET_UINT32 (cache->buffer, image_list_offset);
+      guint32 image_offset = image_list_offset + 4;
+      gint i;
+      for (i = 0; i < n_images; i++)
+        {
+          guint16 index = GET_UINT16 (cache->buffer, image_offset);
+
+          if (index == directory_index)
+            return TRUE;
+          image_offset += 8;
+        }
+    }
+
+  return FALSE;
+}
+
+static void
+pixbuf_destroy_cb (guchar   *pixels,
+                   gpointer  data)
+{
+  GtkIconCache *cache = data;
+
+  _gtk_icon_cache_unref (cache);
+}
+
+GdkPixbuf *
+_gtk_icon_cache_get_icon (GtkIconCache *cache,
+                          const gchar  *icon_name,
+                          gint          directory_index)
+{
+  guint32 offset, image_data_offset, pixel_data_offset;
+  guint32 length, type;
+  GdkPixbuf *pixbuf;
+  GdkPixdata pixdata;
+  GError *error = NULL;
+
+  offset = find_image_offset (cache, icon_name, directory_index);
+
+  if (!offset)
+    return NULL;
+
+  image_data_offset = GET_UINT32 (cache->buffer, offset + 4);
+
+  if (!image_data_offset)
+    return NULL;
+
+  pixel_data_offset = GET_UINT32 (cache->buffer, image_data_offset);
+
+  type = GET_UINT32 (cache->buffer, pixel_data_offset);
+
+  if (type != 0)
+    {
+      GTK_NOTE (ICONTHEME, g_message ("invalid pixel data type %u", type));
+      return NULL;
+    }
+
+  length = GET_UINT32 (cache->buffer, pixel_data_offset + 4);
+
+G_GNUC_BEGIN_IGNORE_DEPRECATIONS
+  if (!gdk_pixdata_deserialize (&pixdata, length,
+                                (guchar *)(cache->buffer + pixel_data_offset + 8),
+                                &error))
+    {
+      GTK_NOTE (ICONTHEME, g_message ("could not deserialize data: %s", error->message));
+      g_error_free (error);
+
+      return NULL;
+    }
+G_GNUC_END_IGNORE_DEPRECATIONS
+
+  pixbuf = gdk_pixbuf_new_from_data (pixdata.pixel_data, GDK_COLORSPACE_RGB,
+                                     (pixdata.pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA,
+                                     8, pixdata.width, pixdata.height, pixdata.rowstride,
+                                     (GdkPixbufDestroyNotify)pixbuf_destroy_cb,
+                                     cache);
+  if (!pixbuf)
+    {
+      GTK_NOTE (ICONTHEME, g_message ("could not convert pixdata to pixbuf: %s", error->message));
+      g_error_free (error);
+
+      return NULL;
+    }
+
+  _gtk_icon_cache_ref (cache);
+
+  return pixbuf;
+}
+

src/st/st-icon-cache.h

@@ -0,0 +1,51 @@
+/* gtkiconcache.h
+ * Copyright (C) 2004  Anders Carlsson <andersca@gnome.org>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __GTK_ICON_CACHE_H__
+#define __GTK_ICON_CACHE_H__
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gdk/gdk.h>
+
+typedef struct _GtkIconCache GtkIconCache;
+
+GtkIconCache *_gtk_icon_cache_new            (const gchar  *data);
+GtkIconCache *_gtk_icon_cache_new_for_path   (const gchar  *path);
+gint          _gtk_icon_cache_get_directory_index  (GtkIconCache *cache,
+                                                    const gchar  *directory);
+gboolean      _gtk_icon_cache_has_icon       (GtkIconCache *cache,
+                                              const gchar  *icon_name);
+gboolean      _gtk_icon_cache_has_icon_in_directory (GtkIconCache *cache,
+                                                     const gchar  *icon_name,
+                                                     const gchar  *directory);
+gboolean      _gtk_icon_cache_has_icons      (GtkIconCache *cache,
+                                              const gchar  *directory);
+void              _gtk_icon_cache_add_icons      (GtkIconCache *cache,
+                                              const gchar  *directory,
+                                              GHashTable   *hash_table);
+
+gint          _gtk_icon_cache_get_icon_flags (GtkIconCache *cache,
+                                              const gchar  *icon_name,
+                                              gint          directory_index);
+GdkPixbuf    *_gtk_icon_cache_get_icon       (GtkIconCache *cache,
+                                              const gchar  *icon_name,
+                                              gint          directory_index);
+
+GtkIconCache *_gtk_icon_cache_ref            (GtkIconCache *cache);
+void          _gtk_icon_cache_unref          (GtkIconCache *cache);
+
+
+#endif /* __GTK_ICON_CACHE_H__ */

src/st/st-icon-theme-private.h

@@ -0,0 +1,41 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 2015 Benjamin Otte <otte@gnome.org>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GTK_ICON_THEME_PRIVATE_H__
+#define __GTK_ICON_THEME_PRIVATE_H__
+
+#include "st-icon-theme.h"
+#include <gtk/gtkcssstyleprivate.h>
+
+void        gtk_icon_theme_lookup_symbolic_colors       (GtkCssStyle    *style,
+                                                         GdkRGBA        *color_out,
+                                                         GdkRGBA        *success_out,
+                                                         GdkRGBA        *warning_out,
+                                                         GdkRGBA        *error_out);
+
+GtkIconInfo *gtk_icon_info_new_for_file (GFile *file,
+                                         gint   size,
+                                         gint   scale);
+
+GdkPixbuf * gtk_icon_theme_color_symbolic_pixbuf (GdkPixbuf     *symbolic,
+                                                  const GdkRGBA *fg_color,
+                                                  const GdkRGBA *success_color,
+                                                  const GdkRGBA *warning_color,
+                                                  const GdkRGBA *error_color);
+
+
+#endif /* __GTK_ICON_THEME_PRIVATE_H__ */

src/st/st-icon-theme.h

@@ -0,0 +1,376 @@
+/* GtkIconTheme - a loader for icon themes
+ * gtk-icon-loader.h 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GTK_ICON_THEME_H__
+#define __GTK_ICON_THEME_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gdk/gdk.h>
+#include <gtk/gtkstylecontext.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_ICON_INFO              (gtk_icon_info_get_type ())
+#define GTK_ICON_INFO(obj)              (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_ICON_INFO, GtkIconInfo))
+#define GTK_ICON_INFO_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_ICON_INFO, GtkIconInfoClass))
+#define GTK_IS_ICON_INFO(obj)           (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_ICON_INFO))
+#define GTK_IS_ICON_INFO_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_ICON_INFO))
+#define GTK_ICON_INFO_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_ICON_INFO, GtkIconInfoClass))
+
+#define GTK_TYPE_ICON_THEME             (gtk_icon_theme_get_type ())
+#define GTK_ICON_THEME(obj)             (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_ICON_THEME, GtkIconTheme))
+#define GTK_ICON_THEME_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_ICON_THEME, GtkIconThemeClass))
+#define GTK_IS_ICON_THEME(obj)          (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_ICON_THEME))
+#define GTK_IS_ICON_THEME_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_ICON_THEME))
+#define GTK_ICON_THEME_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_ICON_THEME, GtkIconThemeClass))
+
+/**
+ * GtkIconInfo:
+ *
+ * Contains information found when looking up an icon in
+ * an icon theme.
+ */
+typedef struct _GtkIconInfo         GtkIconInfo;
+typedef struct _GtkIconInfoClass    GtkIconInfoClass;
+typedef struct _GtkIconTheme        GtkIconTheme;
+typedef struct _GtkIconThemeClass   GtkIconThemeClass;
+typedef struct _GtkIconThemePrivate GtkIconThemePrivate;
+
+/**
+ * GtkIconTheme:
+ *
+ * Acts as a database of information about an icon theme.
+ * Normally, you retrieve the icon theme for a particular
+ * screen using gtk_icon_theme_get_for_screen() and it
+ * will contain information about current icon theme for
+ * that screen, but you can also create a new #GtkIconTheme
+ * object and set the icon theme name explicitly using
+ * gtk_icon_theme_set_custom_theme().
+ */
+struct _GtkIconTheme
+{
+  /*< private >*/
+  GObject parent_instance;
+
+  GtkIconThemePrivate *priv;
+};
+
+/**
+ * GtkIconThemeClass:
+ * @parent_class: The parent class.
+ * @changed: Signal emitted when the current icon theme is switched or
+ *    GTK+ detects that a change has occurred in the contents of the
+ *    current icon theme.
+ */
+struct _GtkIconThemeClass
+{
+  GObjectClass parent_class;
+
+  /*< public >*/
+
+  void (* changed)  (GtkIconTheme *icon_theme);
+
+  /*< private >*/
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
+};
+
+/**
+ * GtkIconLookupFlags:
+ * @GTK_ICON_LOOKUP_NO_SVG: Never get SVG icons, even if gdk-pixbuf
+ *   supports them. Cannot be used together with %GTK_ICON_LOOKUP_FORCE_SVG.
+ * @GTK_ICON_LOOKUP_FORCE_SVG: Get SVG icons, even if gdk-pixbuf
+ *   doesn’t support them.
+ *   Cannot be used together with %GTK_ICON_LOOKUP_NO_SVG.
+ * @GTK_ICON_LOOKUP_USE_BUILTIN: When passed to
+ *   gtk_icon_theme_lookup_icon() includes builtin icons
+ *   as well as files. For a builtin icon, gtk_icon_info_get_filename()
+ *   is %NULL and you need to call gtk_icon_info_get_builtin_pixbuf().
+ * @GTK_ICON_LOOKUP_GENERIC_FALLBACK: Try to shorten icon name at '-'
+ *   characters before looking at inherited themes. This flag is only
+ *   supported in functions that take a single icon name. For more general
+ *   fallback, see gtk_icon_theme_choose_icon(). Since 2.12.
+ * @GTK_ICON_LOOKUP_FORCE_SIZE: Always get the icon scaled to the
+ *   requested size. Since 2.14.
+ * @GTK_ICON_LOOKUP_FORCE_REGULAR: Try to always load regular icons, even
+ *   when symbolic icon names are given. Since 3.14.
+ * @GTK_ICON_LOOKUP_FORCE_SYMBOLIC: Try to always load symbolic icons, even
+ *   when regular icon names are given. Since 3.14.
+ * @GTK_ICON_LOOKUP_DIR_LTR: Try to load a variant of the icon for left-to-right
+ *   text direction. Since 3.14.
+ * @GTK_ICON_LOOKUP_DIR_RTL: Try to load a variant of the icon for right-to-left
+ *   text direction. Since 3.14.
+ *
+ * Used to specify options for gtk_icon_theme_lookup_icon()
+ */
+typedef enum
+{
+  GTK_ICON_LOOKUP_NO_SVG           = 1 << 0,
+  GTK_ICON_LOOKUP_FORCE_SVG        = 1 << 1,
+  GTK_ICON_LOOKUP_USE_BUILTIN      = 1 << 2,
+  GTK_ICON_LOOKUP_GENERIC_FALLBACK = 1 << 3,
+  GTK_ICON_LOOKUP_FORCE_SIZE       = 1 << 4,
+  GTK_ICON_LOOKUP_FORCE_REGULAR    = 1 << 5,
+  GTK_ICON_LOOKUP_FORCE_SYMBOLIC   = 1 << 6,
+  GTK_ICON_LOOKUP_DIR_LTR          = 1 << 7,
+  GTK_ICON_LOOKUP_DIR_RTL          = 1 << 8
+} GtkIconLookupFlags;
+
+/**
+ * GTK_ICON_THEME_ERROR:
+ *
+ * The #GQuark used for #GtkIconThemeError errors.
+ */
+#define GTK_ICON_THEME_ERROR gtk_icon_theme_error_quark ()
+
+/**
+ * GtkIconThemeError:
+ * @GTK_ICON_THEME_NOT_FOUND: The icon specified does not exist in the theme
+ * @GTK_ICON_THEME_FAILED: An unspecified error occurred.
+ *
+ * Error codes for GtkIconTheme operations.
+ **/
+typedef enum {
+  GTK_ICON_THEME_NOT_FOUND,
+  GTK_ICON_THEME_FAILED
+} GtkIconThemeError;
+
+GDK_AVAILABLE_IN_ALL
+GQuark gtk_icon_theme_error_quark (void);
+
+GDK_AVAILABLE_IN_ALL
+GType         gtk_icon_theme_get_type              (void) G_GNUC_CONST;
+
+GDK_AVAILABLE_IN_ALL
+GtkIconTheme *gtk_icon_theme_new                   (void);
+GDK_AVAILABLE_IN_ALL
+GtkIconTheme *gtk_icon_theme_get_default           (void);
+GDK_AVAILABLE_IN_ALL
+GtkIconTheme *gtk_icon_theme_get_for_screen        (GdkScreen                   *screen);
+GDK_AVAILABLE_IN_ALL
+void          gtk_icon_theme_set_screen            (GtkIconTheme                *icon_theme,
+                                                    GdkScreen                   *screen);
+
+GDK_AVAILABLE_IN_ALL
+void          gtk_icon_theme_set_search_path       (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *path[],
+                                                    gint                         n_elements);
+GDK_AVAILABLE_IN_ALL
+void          gtk_icon_theme_get_search_path       (GtkIconTheme                *icon_theme,
+                                                    gchar                      **path[],
+                                                    gint                        *n_elements);
+GDK_AVAILABLE_IN_ALL
+void          gtk_icon_theme_append_search_path    (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *path);
+GDK_AVAILABLE_IN_ALL
+void          gtk_icon_theme_prepend_search_path   (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *path);
+
+GDK_AVAILABLE_IN_3_14
+void          gtk_icon_theme_add_resource_path     (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *path);
+
+GDK_AVAILABLE_IN_ALL
+void          gtk_icon_theme_set_custom_theme      (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *theme_name);
+
+GDK_AVAILABLE_IN_ALL
+gboolean      gtk_icon_theme_has_icon              (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *icon_name);
+GDK_AVAILABLE_IN_ALL
+gint         *gtk_icon_theme_get_icon_sizes        (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *icon_name);
+GDK_AVAILABLE_IN_ALL
+GtkIconInfo * gtk_icon_theme_lookup_icon           (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *icon_name,
+                                                    gint                         size,
+                                                    GtkIconLookupFlags           flags);
+GDK_AVAILABLE_IN_3_10
+GtkIconInfo * gtk_icon_theme_lookup_icon_for_scale (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *icon_name,
+                                                    gint                         size,
+                                                    gint                         scale,
+                                                    GtkIconLookupFlags           flags);
+
+GDK_AVAILABLE_IN_ALL
+GtkIconInfo * gtk_icon_theme_choose_icon           (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *icon_names[],
+                                                    gint                         size,
+                                                    GtkIconLookupFlags           flags);
+GDK_AVAILABLE_IN_3_10
+GtkIconInfo * gtk_icon_theme_choose_icon_for_scale (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *icon_names[],
+                                                    gint                         size,
+                                                    gint                         scale,
+                                                    GtkIconLookupFlags           flags);
+GDK_AVAILABLE_IN_ALL
+GdkPixbuf *   gtk_icon_theme_load_icon             (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *icon_name,
+                                                    gint                         size,
+                                                    GtkIconLookupFlags           flags,
+                                                    GError                     **error);
+GDK_AVAILABLE_IN_3_10
+GdkPixbuf *   gtk_icon_theme_load_icon_for_scale   (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *icon_name,
+                                                    gint                         size,
+                                                    gint                         scale,
+                                                    GtkIconLookupFlags           flags,
+                                                    GError                     **error);
+GDK_AVAILABLE_IN_3_10
+cairo_surface_t * gtk_icon_theme_load_surface      (GtkIconTheme        *icon_theme,
+                                                    const gchar         *icon_name,
+                                                    gint                 size,
+                                                    gint                 scale,
+                                                    GdkWindow           *for_window,
+                                                    GtkIconLookupFlags   flags,
+                                                    GError             **error);
+
+GDK_AVAILABLE_IN_ALL
+GtkIconInfo * gtk_icon_theme_lookup_by_gicon       (GtkIconTheme                *icon_theme,
+                                                    GIcon                       *icon,
+                                                    gint                         size,
+                                                    GtkIconLookupFlags           flags);
+GDK_AVAILABLE_IN_3_10
+GtkIconInfo * gtk_icon_theme_lookup_by_gicon_for_scale (GtkIconTheme             *icon_theme,
+                                                        GIcon                    *icon,
+                                                        gint                      size,
+                                                        gint                      scale,
+                                                        GtkIconLookupFlags        flags);
+
+
+GDK_AVAILABLE_IN_ALL
+GList *       gtk_icon_theme_list_icons            (GtkIconTheme                *icon_theme,
+                                                    const gchar                 *context);
+GDK_AVAILABLE_IN_ALL
+GList *       gtk_icon_theme_list_contexts         (GtkIconTheme                *icon_theme);
+GDK_AVAILABLE_IN_ALL
+char *        gtk_icon_theme_get_example_icon_name (GtkIconTheme                *icon_theme);
+
+GDK_AVAILABLE_IN_ALL
+gboolean      gtk_icon_theme_rescan_if_needed      (GtkIconTheme                *icon_theme);
+
+GDK_DEPRECATED_IN_3_14_FOR(gtk_icon_theme_add_resource_path)
+void          gtk_icon_theme_add_builtin_icon      (const gchar *icon_name,
+                                                    gint         size,
+                                                    GdkPixbuf   *pixbuf);
+
+GDK_AVAILABLE_IN_ALL
+GType                 gtk_icon_info_get_type           (void) G_GNUC_CONST;
+GDK_DEPRECATED_IN_3_8_FOR(g_object_ref)
+GtkIconInfo *         gtk_icon_info_copy               (GtkIconInfo  *icon_info);
+GDK_DEPRECATED_IN_3_8_FOR(g_object_unref)
+void                  gtk_icon_info_free               (GtkIconInfo  *icon_info);
+
+GDK_AVAILABLE_IN_ALL
+GtkIconInfo *         gtk_icon_info_new_for_pixbuf     (GtkIconTheme  *icon_theme,
+                                                        GdkPixbuf     *pixbuf);
+
+GDK_AVAILABLE_IN_ALL
+gint                  gtk_icon_info_get_base_size      (GtkIconInfo   *icon_info);
+GDK_AVAILABLE_IN_3_10
+gint                  gtk_icon_info_get_base_scale     (GtkIconInfo   *icon_info);
+GDK_AVAILABLE_IN_ALL
+const gchar *         gtk_icon_info_get_filename       (GtkIconInfo   *icon_info);
+GDK_DEPRECATED_IN_3_14
+GdkPixbuf *           gtk_icon_info_get_builtin_pixbuf (GtkIconInfo   *icon_info);
+GDK_AVAILABLE_IN_3_12
+gboolean              gtk_icon_info_is_symbolic        (GtkIconInfo   *icon_info);
+GDK_AVAILABLE_IN_ALL
+GdkPixbuf *           gtk_icon_info_load_icon          (GtkIconInfo   *icon_info,
+                                                        GError       **error);
+GDK_AVAILABLE_IN_3_10
+cairo_surface_t *     gtk_icon_info_load_surface       (GtkIconInfo   *icon_info,
+                                                        GdkWindow     *for_window,
+                                                        GError       **error);
+GDK_AVAILABLE_IN_3_8
+void                  gtk_icon_info_load_icon_async   (GtkIconInfo          *icon_info,
+                                                       GCancellable         *cancellable,
+                                                       GAsyncReadyCallback   callback,
+                                                       gpointer              user_data);
+GDK_AVAILABLE_IN_3_8
+GdkPixbuf *           gtk_icon_info_load_icon_finish  (GtkIconInfo          *icon_info,
+                                                       GAsyncResult         *res,
+                                                       GError              **error);
+GDK_AVAILABLE_IN_ALL
+GdkPixbuf *           gtk_icon_info_load_symbolic      (GtkIconInfo   *icon_info,
+                                                        const GdkRGBA *fg,
+                                                        const GdkRGBA *success_color,
+                                                        const GdkRGBA *warning_color,
+                                                        const GdkRGBA *error_color,
+                                                        gboolean      *was_symbolic,
+                                                        GError       **error);
+GDK_AVAILABLE_IN_3_8
+void                  gtk_icon_info_load_symbolic_async (GtkIconInfo   *icon_info,
+                                                         const GdkRGBA *fg,
+                                                         const GdkRGBA *success_color,
+                                                         const GdkRGBA *warning_color,
+                                                         const GdkRGBA *error_color,
+                                                         GCancellable         *cancellable,
+                                                         GAsyncReadyCallback   callback,
+                                                         gpointer              user_data);
+GDK_AVAILABLE_IN_3_8
+GdkPixbuf *           gtk_icon_info_load_symbolic_finish (GtkIconInfo   *icon_info,
+                                                          GAsyncResult         *res,
+                                                          gboolean      *was_symbolic,
+                                                          GError       **error);
+GDK_AVAILABLE_IN_ALL
+GdkPixbuf *           gtk_icon_info_load_symbolic_for_context (GtkIconInfo      *icon_info,
+                                                               GtkStyleContext  *context,
+                                                               gboolean         *was_symbolic,
+                                                               GError          **error);
+GDK_AVAILABLE_IN_3_8
+void                  gtk_icon_info_load_symbolic_for_context_async (GtkIconInfo      *icon_info,
+                                                                     GtkStyleContext  *context,
+                                                                     GCancellable     *cancellable,
+                                                                     GAsyncReadyCallback callback,
+                                                                     gpointer          user_data);
+GDK_AVAILABLE_IN_3_8
+GdkPixbuf *           gtk_icon_info_load_symbolic_for_context_finish (GtkIconInfo      *icon_info,
+                                                                      GAsyncResult     *res,
+                                                                      gboolean         *was_symbolic,
+                                                                      GError          **error);
+GDK_DEPRECATED_IN_3_0_FOR(gtk_icon_info_load_symbol_for_context)
+GdkPixbuf *           gtk_icon_info_load_symbolic_for_style  (GtkIconInfo   *icon_info,
+                                                              GtkStyle      *style,
+                                                              GtkStateType   state,
+                                                              gboolean      *was_symbolic,
+                                                              GError       **error);
+GDK_DEPRECATED_IN_3_14
+void                  gtk_icon_info_set_raw_coordinates (GtkIconInfo  *icon_info,
+                                                         gboolean      raw_coordinates);
+
+GDK_DEPRECATED_IN_3_14
+gboolean              gtk_icon_info_get_embedded_rect (GtkIconInfo    *icon_info,
+                                                       GdkRectangle   *rectangle);
+GDK_DEPRECATED_IN_3_14
+gboolean              gtk_icon_info_get_attach_points (GtkIconInfo    *icon_info,
+                                                       GdkPoint      **points,
+                                                       gint           *n_points);
+GDK_DEPRECATED_IN_3_14
+const gchar *         gtk_icon_info_get_display_name  (GtkIconInfo    *icon_info);
+
+G_END_DECLS
+
+#endif /* __GTK_ICON_THEME_H__ */