Adding upstream version 2.10.22.upstream/2.10.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1245 insertions, 0 deletions

diff --git a/app/core/gimpdata.c b/app/core/gimpdata.c
new file mode 100644
index 0000000..e4640f3
--- /dev/null
+++ b/app/core/gimpdata.c
@@ -0,0 +1,1245 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpdata.c
+ * Copyright (C) 2001 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "core-types.h"
+
+#include "gimp-memsize.h"
+#include "gimpdata.h"
+#include "gimpmarshal.h"
+#include "gimptag.h"
+#include "gimptagged.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  DIRTY,
+  LAST_SIGNAL
+};
+
+enum
+{
+  PROP_0,
+  PROP_FILE,
+  PROP_WRITABLE,
+  PROP_DELETABLE,
+  PROP_MIME_TYPE
+};
+
+
+struct _GimpDataPrivate
+{
+  GFile  *file;
+  GQuark  mime_type;
+  guint   writable  : 1;
+  guint   deletable : 1;
+  guint   dirty     : 1;
+  guint   internal  : 1;
+  gint    freeze_count;
+  gint64  mtime;
+
+  /* Identifies the GimpData object across sessions. Used when there
+   * is not a filename associated with the object.
+   */
+  gchar  *identifier;
+
+  GList  *tags;
+};
+
+#define GIMP_DATA_GET_PRIVATE(obj) (((GimpData *) (obj))->priv)
+
+
+static void       gimp_data_tagged_iface_init (GimpTaggedInterface *iface);
+
+static void       gimp_data_constructed       (GObject             *object);
+static void       gimp_data_finalize          (GObject             *object);
+static void       gimp_data_set_property      (GObject             *object,
+                                               guint                property_id,
+                                               const GValue        *value,
+                                               GParamSpec          *pspec);
+static void       gimp_data_get_property      (GObject             *object,
+                                               guint                property_id,
+                                               GValue              *value,
+                                               GParamSpec          *pspec);
+
+static void       gimp_data_name_changed      (GimpObject          *object);
+static gint64     gimp_data_get_memsize       (GimpObject          *object,
+                                               gint64              *gui_size);
+
+static gboolean   gimp_data_is_name_editable  (GimpViewable        *viewable);
+
+static void       gimp_data_real_dirty        (GimpData            *data);
+static GimpData * gimp_data_real_duplicate    (GimpData            *data);
+static gint       gimp_data_real_compare      (GimpData            *data1,
+                                               GimpData            *data2);
+
+static gboolean   gimp_data_add_tag           (GimpTagged          *tagged,
+                                               GimpTag             *tag);
+static gboolean   gimp_data_remove_tag        (GimpTagged          *tagged,
+                                               GimpTag             *tag);
+static GList    * gimp_data_get_tags          (GimpTagged          *tagged);
+static gchar    * gimp_data_get_identifier    (GimpTagged          *tagged);
+static gchar    * gimp_data_get_checksum      (GimpTagged          *tagged);
+
+
+G_DEFINE_TYPE_WITH_CODE (GimpData, gimp_data, GIMP_TYPE_VIEWABLE,
+                         G_ADD_PRIVATE (GimpData)
+                         G_IMPLEMENT_INTERFACE (GIMP_TYPE_TAGGED,
+                                                gimp_data_tagged_iface_init))
+
+#define parent_class gimp_data_parent_class
+
+static guint data_signals[LAST_SIGNAL] = { 0 };
+
+
+static void
+gimp_data_class_init (GimpDataClass *klass)
+{
+  GObjectClass      *object_class      = G_OBJECT_CLASS (klass);
+  GimpObjectClass   *gimp_object_class = GIMP_OBJECT_CLASS (klass);
+  GimpViewableClass *viewable_class    = GIMP_VIEWABLE_CLASS (klass);
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  data_signals[DIRTY] =
+    g_signal_new ("dirty",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_FIRST,
+                  G_STRUCT_OFFSET (GimpDataClass, dirty),
+                  NULL, NULL,
+                  gimp_marshal_VOID__VOID,
+                  G_TYPE_NONE, 0);
+
+  object_class->constructed        = gimp_data_constructed;
+  object_class->finalize           = gimp_data_finalize;
+  object_class->set_property       = gimp_data_set_property;
+  object_class->get_property       = gimp_data_get_property;
+
+  gimp_object_class->name_changed  = gimp_data_name_changed;
+  gimp_object_class->get_memsize   = gimp_data_get_memsize;
+
+  viewable_class->name_editable    = TRUE;
+  viewable_class->is_name_editable = gimp_data_is_name_editable;
+
+  klass->dirty                     = gimp_data_real_dirty;
+  klass->save                      = NULL;
+  klass->get_extension             = NULL;
+  klass->copy                      = NULL;
+  klass->duplicate                 = gimp_data_real_duplicate;
+  klass->compare                   = gimp_data_real_compare;
+
+  g_object_class_install_property (object_class, PROP_FILE,
+                                   g_param_spec_object ("file", NULL, NULL,
+                                                        G_TYPE_FILE,
+                                                        GIMP_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class, PROP_WRITABLE,
+                                   g_param_spec_boolean ("writable", NULL, NULL,
+                                                         FALSE,
+                                                         GIMP_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class, PROP_DELETABLE,
+                                   g_param_spec_boolean ("deletable", NULL, NULL,
+                                                         FALSE,
+                                                         GIMP_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class, PROP_MIME_TYPE,
+                                   g_param_spec_string ("mime-type", NULL, NULL,
+                                                        NULL,
+                                                        GIMP_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+gimp_data_tagged_iface_init (GimpTaggedInterface *iface)
+{
+  iface->add_tag        = gimp_data_add_tag;
+  iface->remove_tag     = gimp_data_remove_tag;
+  iface->get_tags       = gimp_data_get_tags;
+  iface->get_identifier = gimp_data_get_identifier;
+  iface->get_checksum   = gimp_data_get_checksum;
+}
+
+static void
+gimp_data_init (GimpData *data)
+{
+  GimpDataPrivate *private = gimp_data_get_instance_private (data);
+
+  data->priv = private;
+
+  private->writable  = TRUE;
+  private->deletable = TRUE;
+  private->dirty     = TRUE;
+
+  /*  freeze the data object during construction  */
+  gimp_data_freeze (data);
+}
+
+static void
+gimp_data_constructed (GObject *object)
+{
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (object);
+
+  G_OBJECT_CLASS (parent_class)->constructed (object);
+
+  if (! GIMP_DATA_GET_CLASS (object)->save)
+    private->writable = FALSE;
+
+  gimp_data_thaw (GIMP_DATA (object));
+}
+
+static void
+gimp_data_finalize (GObject *object)
+{
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (object);
+
+  g_clear_object (&private->file);
+
+  if (private->tags)
+    {
+      g_list_free_full (private->tags, (GDestroyNotify) g_object_unref);
+      private->tags = NULL;
+    }
+
+  g_clear_pointer (&private->identifier, g_free);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_data_set_property (GObject      *object,
+                        guint         property_id,
+                        const GValue *value,
+                        GParamSpec   *pspec)
+{
+  GimpData        *data    = GIMP_DATA (object);
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (data);
+
+  switch (property_id)
+    {
+    case PROP_FILE:
+      gimp_data_set_file (data,
+                          g_value_get_object (value),
+                          private->writable,
+                          private->deletable);
+      break;
+
+    case PROP_WRITABLE:
+      private->writable = g_value_get_boolean (value);
+      break;
+
+    case PROP_DELETABLE:
+      private->deletable = g_value_get_boolean (value);
+      break;
+
+    case PROP_MIME_TYPE:
+      if (g_value_get_string (value))
+        private->mime_type = g_quark_from_string (g_value_get_string (value));
+      else
+        private->mime_type = 0;
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_data_get_property (GObject    *object,
+                        guint       property_id,
+                        GValue     *value,
+                        GParamSpec *pspec)
+{
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (object);
+
+  switch (property_id)
+    {
+    case PROP_FILE:
+      g_value_set_object (value, private->file);
+      break;
+
+    case PROP_WRITABLE:
+      g_value_set_boolean (value, private->writable);
+      break;
+
+    case PROP_DELETABLE:
+      g_value_set_boolean (value, private->deletable);
+      break;
+
+    case PROP_MIME_TYPE:
+      g_value_set_string (value, g_quark_to_string (private->mime_type));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_data_name_changed (GimpObject *object)
+{
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (object);
+
+  private->dirty = TRUE;
+
+  if (GIMP_OBJECT_CLASS (parent_class)->name_changed)
+    GIMP_OBJECT_CLASS (parent_class)->name_changed (object);
+}
+
+static gint64
+gimp_data_get_memsize (GimpObject *object,
+                       gint64     *gui_size)
+{
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (object);
+  gint64           memsize = 0;
+
+  memsize += gimp_g_object_get_memsize (G_OBJECT (private->file));
+
+  return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
+                                                                  gui_size);
+}
+
+static gboolean
+gimp_data_is_name_editable (GimpViewable *viewable)
+{
+  return gimp_data_is_writable (GIMP_DATA (viewable)) &&
+         ! gimp_data_is_internal (GIMP_DATA (viewable));
+}
+
+static void
+gimp_data_real_dirty (GimpData *data)
+{
+  gimp_viewable_invalidate_preview (GIMP_VIEWABLE (data));
+
+  /* Emit the "name-changed" to signal general dirtiness, our name
+   * changed implementation will also set the "dirty" flag to TRUE.
+   */
+  gimp_object_name_changed (GIMP_OBJECT (data));
+}
+
+static GimpData *
+gimp_data_real_duplicate (GimpData *data)
+{
+  if (GIMP_DATA_GET_CLASS (data)->copy)
+    {
+      GimpData *new = g_object_new (G_OBJECT_TYPE (data), NULL);
+
+      gimp_data_copy (new, data);
+
+      return new;
+    }
+
+  return NULL;
+}
+
+static gint
+gimp_data_real_compare (GimpData *data1,
+                        GimpData *data2)
+{
+  GimpDataPrivate *private1 = GIMP_DATA_GET_PRIVATE (data1);
+  GimpDataPrivate *private2 = GIMP_DATA_GET_PRIVATE (data2);
+
+  /*  move the internal objects (like the FG -> BG) gradient) to the top  */
+  if (private1->internal != private2->internal)
+    return private1->internal ? -1 : 1;
+
+  /*  keep user-deletable objects above system resource files  */
+  if (private1->deletable != private2->deletable)
+    return private1->deletable ? -1 : 1;
+
+  return gimp_object_name_collate ((GimpObject *) data1,
+                                   (GimpObject *) data2);
+}
+
+static gboolean
+gimp_data_add_tag (GimpTagged *tagged,
+                   GimpTag    *tag)
+{
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (tagged);
+  GList           *list;
+
+  for (list = private->tags; list; list = g_list_next (list))
+    {
+      GimpTag *this = GIMP_TAG (list->data);
+
+      if (gimp_tag_equals (tag, this))
+        return FALSE;
+    }
+
+  private->tags = g_list_prepend (private->tags, g_object_ref (tag));
+
+  return TRUE;
+}
+
+static gboolean
+gimp_data_remove_tag (GimpTagged *tagged,
+                      GimpTag    *tag)
+{
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (tagged);
+  GList           *list;
+
+  for (list = private->tags; list; list = g_list_next (list))
+    {
+      GimpTag *this = GIMP_TAG (list->data);
+
+      if (gimp_tag_equals (tag, this))
+        {
+          private->tags = g_list_delete_link (private->tags, list);
+          g_object_unref (this);
+          return TRUE;
+        }
+    }
+
+  return FALSE;
+}
+
+static GList *
+gimp_data_get_tags (GimpTagged *tagged)
+{
+  GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (tagged);
+
+  return private->tags;
+}
+
+static gchar *
+gimp_data_get_identifier (GimpTagged *tagged)
+{
+  GimpDataPrivate *private    = GIMP_DATA_GET_PRIVATE (tagged);
+  gchar           *identifier = NULL;
+
+  if (private->file)
+    {
+      const gchar *data_dir = gimp_data_directory ();
+      const gchar *gimp_dir = gimp_directory ();
+      gchar       *path     = g_file_get_path (private->file);
+      gchar       *tmp;
+
+      if (g_str_has_prefix (path, data_dir))
+        {
+          tmp = g_strconcat ("${gimp_data_dir}",
+                             path + strlen (data_dir),
+                             NULL);
+          identifier = g_filename_to_utf8 (tmp, -1, NULL, NULL, NULL);
+          g_free (tmp);
+        }
+      else if (g_str_has_prefix (path, gimp_dir))
+        {
+          tmp = g_strconcat ("${gimp_dir}",
+                             path + strlen (gimp_dir),
+                             NULL);
+          identifier = g_filename_to_utf8 (tmp, -1, NULL, NULL, NULL);
+          g_free (tmp);
+        }
+      else if (g_str_has_prefix (path, MYPAINT_BRUSHES_DIR))
+        {
+          tmp = g_strconcat ("${mypaint_brushes_dir}",
+                             path + strlen (MYPAINT_BRUSHES_DIR),
+                             NULL);
+          identifier = g_filename_to_utf8 (tmp, -1, NULL, NULL, NULL);
+          g_free (tmp);
+        }
+      else
+        {
+          identifier = g_filename_to_utf8 (path, -1,
+                                           NULL, NULL, NULL);
+        }
+
+      if (! identifier)
+        {
+          g_printerr ("%s: failed to convert '%s' to utf8.\n",
+                      G_STRFUNC, path);
+          identifier = g_strdup (path);
+        }
+
+      g_free (path);
+    }
+  else if (private->internal)
+    {
+      identifier = g_strdup (private->identifier);
+    }
+
+  return identifier;
+}
+
+static gchar *
+gimp_data_get_checksum (GimpTagged *tagged)
+{
+  return NULL;
+}
+
+/**
+ * gimp_data_save:
+ * @data:  object whose contents are to be saved.
+ * @error: return location for errors or %NULL
+ *
+ * Save the object.  If the object is marked as "internal", nothing
+ * happens.  Otherwise, it is saved to disk, using the file name set
+ * by gimp_data_set_file().  If the save is successful, the object is
+ * marked as not dirty.  If not, an error message is returned using
+ * the @error argument.
+ *
+ * Returns: %TRUE if the object is internal or the save is successful.
+ **/
+gboolean
+gimp_data_save (GimpData  *data,
+                GError   **error)
+{
+  GimpDataPrivate *private;
+  gboolean         success = FALSE;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  g_return_val_if_fail (private->writable == TRUE, FALSE);
+
+  if (private->internal)
+    {
+      private->dirty = FALSE;
+      return TRUE;
+    }
+
+  g_return_val_if_fail (G_IS_FILE (private->file), FALSE);
+
+  if (GIMP_DATA_GET_CLASS (data)->save)
+    {
+      GOutputStream *output;
+
+      output = G_OUTPUT_STREAM (g_file_replace (private->file,
+                                                NULL, FALSE, G_FILE_CREATE_NONE,
+                                                NULL, error));
+
+      if (output)
+        {
+          success = GIMP_DATA_GET_CLASS (data)->save (data, output, error);
+
+          if (success)
+            {
+              if (! g_output_stream_close (output, NULL, error))
+                {
+                  g_prefix_error (error,
+                                  _("Error saving '%s': "),
+                                  gimp_file_get_utf8_name (private->file));
+                  success = FALSE;
+                }
+            }
+          else
+            {
+              GCancellable *cancellable = g_cancellable_new ();
+
+              g_cancellable_cancel (cancellable);
+              if (error && *error)
+                {
+                  g_prefix_error (error,
+                                  _("Error saving '%s': "),
+                                  gimp_file_get_utf8_name (private->file));
+                }
+              else
+                {
+                  g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_WRITE,
+                               _("Error saving '%s'"),
+                               gimp_file_get_utf8_name (private->file));
+                }
+              g_output_stream_close (output, cancellable, NULL);
+              g_object_unref (cancellable);
+            }
+
+          g_object_unref (output);
+        }
+    }
+
+  if (success)
+    {
+      GFileInfo *info = g_file_query_info (private->file,
+                                           G_FILE_ATTRIBUTE_TIME_MODIFIED,
+                                           G_FILE_QUERY_INFO_NONE,
+                                           NULL, NULL);
+      if (info)
+        {
+          private->mtime =
+            g_file_info_get_attribute_uint64 (info,
+                                              G_FILE_ATTRIBUTE_TIME_MODIFIED);
+          g_object_unref (info);
+        }
+
+      private->dirty = FALSE;
+    }
+
+  return success;
+}
+
+/**
+ * gimp_data_dirty:
+ * @data: a #GimpData object.
+ *
+ * Marks @data as dirty.  Unless the object is frozen, this causes
+ * its preview to be invalidated, and emits a "dirty" signal.  If the
+ * object is frozen, the function has no effect.
+ **/
+void
+gimp_data_dirty (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  if (private->freeze_count == 0)
+    g_signal_emit (data, data_signals[DIRTY], 0);
+}
+
+void
+gimp_data_clean (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  private->dirty = FALSE;
+}
+
+gboolean
+gimp_data_is_dirty (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  return private->dirty;
+}
+
+/**
+ * gimp_data_freeze:
+ * @data: a #GimpData object.
+ *
+ * Increments the freeze count for the object.  A positive freeze count
+ * prevents the object from being treated as dirty.  Any call to this
+ * function must be followed eventually by a call to gimp_data_thaw().
+ **/
+void
+gimp_data_freeze (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  private->freeze_count++;
+}
+
+/**
+ * gimp_data_thaw:
+ * @data: a #GimpData object.
+ *
+ * Decrements the freeze count for the object.  If the freeze count
+ * drops to zero, the object is marked as dirty, and the "dirty"
+ * signal is emitted.  It is an error to call this function without
+ * having previously called gimp_data_freeze().
+ **/
+void
+gimp_data_thaw (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  g_return_if_fail (private->freeze_count > 0);
+
+  private->freeze_count--;
+
+  if (private->freeze_count == 0)
+    gimp_data_dirty (data);
+}
+
+gboolean
+gimp_data_is_frozen (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  return private->freeze_count > 0;
+}
+
+/**
+ * gimp_data_delete_from_disk:
+ * @data:  a #GimpData object.
+ * @error: return location for errors or %NULL
+ *
+ * Deletes the object from disk.  If the object is marked as "internal",
+ * nothing happens.  Otherwise, if the file exists whose name has been
+ * set by gimp_data_set_file(), it is deleted.  Obviously this is
+ * a potentially dangerous function, which should be used with care.
+ *
+ * Returns: %TRUE if the object is internal to Gimp, or the deletion is
+ *          successful.
+ **/
+gboolean
+gimp_data_delete_from_disk (GimpData  *data,
+                            GError   **error)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  g_return_val_if_fail (private->file      != NULL, FALSE);
+  g_return_val_if_fail (private->deletable == TRUE, FALSE);
+
+  if (private->internal)
+    return TRUE;
+
+  return g_file_delete (private->file, NULL, error);
+}
+
+const gchar *
+gimp_data_get_extension (GimpData *data)
+{
+  g_return_val_if_fail (GIMP_IS_DATA (data), NULL);
+
+  if (GIMP_DATA_GET_CLASS (data)->get_extension)
+    return GIMP_DATA_GET_CLASS (data)->get_extension (data);
+
+  return NULL;
+}
+
+/**
+ * gimp_data_set_file:
+ * @data:     A #GimpData object
+ * @file:     File to assign to @data.
+ * @writable: %TRUE if we want to be able to write to this file.
+ * @deletable: %TRUE if we want to be able to delete this file.
+ *
+ * This function assigns a file to @data, and sets some flags
+ * according to the properties of the file.  If @writable is %TRUE,
+ * and the user has permission to write or overwrite the requested
+ * file name, and a "save" method exists for @data's object type, then
+ * @data is marked as writable.
+ **/
+void
+gimp_data_set_file (GimpData *data,
+                    GFile    *file,
+                    gboolean  writable,
+                    gboolean  deletable)
+{
+  GimpDataPrivate *private;
+  gchar           *path;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+  g_return_if_fail (G_IS_FILE (file));
+
+  path = g_file_get_path (file);
+
+  g_return_if_fail (path != NULL);
+  g_return_if_fail (g_path_is_absolute (path));
+
+  g_free (path);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  if (private->internal)
+    return;
+
+  g_set_object (&private->file, file);
+
+  private->writable  = FALSE;
+  private->deletable = FALSE;
+
+  /*  if the data is supposed to be writable or deletable,
+   *  still check if it really is
+   */
+  if (writable || deletable)
+    {
+      GFileInfo *info;
+
+      if (g_file_query_exists (private->file, NULL)) /* check if it exists */
+        {
+          info = g_file_query_info (private->file,
+                                    G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE,
+                                    G_FILE_QUERY_INFO_NONE,
+                                    NULL, NULL);
+
+          /* and we can write it */
+          if (info)
+            {
+              if (g_file_info_get_attribute_boolean (info,
+                                                     G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE))
+                {
+                  private->writable  = writable  ? TRUE : FALSE;
+                  private->deletable = deletable ? TRUE : FALSE;
+                }
+
+              g_object_unref (info);
+            }
+        }
+      else /* OR it doesn't exist */
+        {
+          GFile *parent = g_file_get_parent (private->file);
+
+          info = g_file_query_info (parent,
+                                    G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE,
+                                    G_FILE_QUERY_INFO_NONE,
+                                    NULL, NULL);
+
+          /* and we can write to its parent directory */
+          if (info)
+            {
+              if (g_file_info_get_attribute_boolean (info,
+                                                     G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE))
+                {
+                  private->writable  = writable  ? TRUE : FALSE;
+                  private->deletable = deletable ? TRUE : FALSE;
+                }
+
+              g_object_unref (info);
+            }
+
+          g_object_unref (parent);
+        }
+
+      /*  if we can't save, we are not writable  */
+      if (! GIMP_DATA_GET_CLASS (data)->save)
+        private->writable = FALSE;
+    }
+}
+
+GFile *
+gimp_data_get_file (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), NULL);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  return private->file;
+}
+
+/**
+ * gimp_data_create_filename:
+ * @data:     a #Gimpdata object.
+ * @dest_dir: directory in which to create a file name.
+ *
+ * This function creates a unique file name to be used for saving
+ * a representation of @data in the directory @dest_dir.  If the
+ * user does not have write permission in @dest_dir, then @data
+ * is marked as "not writable", so you should check on this before
+ * assuming that @data can be saved.
+ **/
+void
+gimp_data_create_filename (GimpData *data,
+                           GFile    *dest_dir)
+{
+  GimpDataPrivate *private;
+  gchar           *safename;
+  gchar           *basename;
+  GFile           *file;
+  gint             i;
+  gint             unum  = 1;
+  GError          *error = NULL;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+  g_return_if_fail (G_IS_FILE (dest_dir));
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  if (private->internal)
+    return;
+
+  safename = g_strstrip (g_strdup (gimp_object_get_name (data)));
+
+  if (safename[0] == '.')
+    safename[0] = '-';
+
+  for (i = 0; safename[i]; i++)
+    if (strchr ("\\/*?\"`'<>{}|\n\t ;:$^&", safename[i]))
+      safename[i] = '-';
+
+  basename = g_strconcat (safename, gimp_data_get_extension (data), NULL);
+
+  file = g_file_get_child_for_display_name (dest_dir, basename, &error);
+  g_free (basename);
+
+  if (! file)
+    {
+      g_warning ("gimp_data_create_filename:\n"
+                 "g_file_get_child_for_display_name() failed for '%s': %s",
+                 gimp_object_get_name (data), error->message);
+      g_clear_error (&error);
+      g_free (safename);
+      return;
+    }
+
+  while (g_file_query_exists (file, NULL))
+    {
+      g_object_unref (file);
+
+      basename = g_strdup_printf ("%s-%d%s",
+                                  safename,
+                                  unum++,
+                                  gimp_data_get_extension (data));
+
+      file = g_file_get_child_for_display_name (dest_dir, basename, NULL);
+      g_free (basename);
+    }
+
+  g_free (safename);
+
+  gimp_data_set_file (data, file, TRUE, TRUE);
+
+  g_object_unref (file);
+}
+
+static const gchar *tag_blacklist[] = { "brushes",
+                                        "dynamics",
+                                        "patterns",
+                                        "palettes",
+                                        "gradients",
+                                        "tool-presets" };
+
+/**
+ * gimp_data_set_folder_tags:
+ * @data:          a #Gimpdata object.
+ * @top_directory: the top directory of the currently processed data
+ *                 hierarchy.
+ *
+ * Sets tags based on all folder names below top_directory. So if the
+ * data's filename is e.g.
+ * /home/foo/.config/GIMP/X.Y/brushes/Flowers/Roses/rose.gbr, it will
+ * add "Flowers" and "Roses" tags.
+ *
+ * if the top directory (as passed, or as derived from the data's
+ * filename) does not end with one of the default data directory names
+ * (brushes, patterns etc), its name will be added as tag too.
+ **/
+void
+gimp_data_set_folder_tags (GimpData *data,
+                           GFile    *top_directory)
+{
+  GimpDataPrivate *private;
+  gchar           *tmp;
+  gchar           *dirname;
+  gchar           *top_path;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+  g_return_if_fail (G_IS_FILE (top_directory));
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  if (private->internal)
+    return;
+
+  g_return_if_fail (private->file != NULL);
+
+  tmp = g_file_get_path (private->file);
+  dirname = g_path_get_dirname (tmp);
+  g_free (tmp);
+
+  top_path = g_file_get_path (top_directory);
+
+  g_return_if_fail (g_str_has_prefix (dirname, top_path));
+
+  /*  walk up the hierarchy and set each folder on the way as tag,
+   *  except the top_directory
+   */
+  while (strcmp (dirname, top_path))
+    {
+      gchar   *basename = g_path_get_basename (dirname);
+      GimpTag *tag      = gimp_tag_new (basename);
+
+      gimp_tag_set_internal (tag, TRUE);
+      gimp_tagged_add_tag (GIMP_TAGGED (data), tag);
+      g_object_unref (tag);
+      g_free (basename);
+
+      tmp = g_path_get_dirname (dirname);
+      g_free (dirname);
+      dirname = tmp;
+    }
+
+  g_free (top_path);
+
+  if (dirname)
+    {
+      gchar *basename = g_path_get_basename (dirname);
+      gint   i;
+
+      for (i = 0; i <  G_N_ELEMENTS (tag_blacklist); i++)
+        {
+          if (! strcmp (basename, tag_blacklist[i]))
+            break;
+        }
+
+      if (i == G_N_ELEMENTS (tag_blacklist))
+        {
+          GimpTag *tag = gimp_tag_new (basename);
+
+          gimp_tag_set_internal (tag, TRUE);
+          gimp_tagged_add_tag (GIMP_TAGGED (data), tag);
+          g_object_unref (tag);
+        }
+
+      g_free (basename);
+      g_free (dirname);
+    }
+}
+
+const gchar *
+gimp_data_get_mime_type (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), NULL);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  return g_quark_to_string (private->mime_type);
+}
+
+gboolean
+gimp_data_is_writable (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  return private->writable;
+}
+
+gboolean
+gimp_data_is_deletable (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  return private->deletable;
+}
+
+void
+gimp_data_set_mtime (GimpData *data,
+                     gint64    mtime)
+{
+  GimpDataPrivate *private;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  private->mtime = mtime;
+}
+
+gint64
+gimp_data_get_mtime (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), 0);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  return private->mtime;
+}
+
+gboolean
+gimp_data_is_copyable (GimpData *data)
+{
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+
+  return GIMP_DATA_GET_CLASS (data)->copy != NULL;
+}
+
+/**
+ * gimp_data_copy:
+ * @data:     a #GimpData object
+ * @src_data: the #GimpData object to copy from
+ *
+ * Copies @src_data to @data.  Only the object data is  copied:  the
+ * name, file name, preview, etc. are not copied.
+ **/
+void
+gimp_data_copy (GimpData *data,
+                GimpData *src_data)
+{
+  g_return_if_fail (GIMP_IS_DATA (data));
+  g_return_if_fail (GIMP_IS_DATA (src_data));
+  g_return_if_fail (GIMP_DATA_GET_CLASS (data)->copy != NULL);
+  g_return_if_fail (GIMP_DATA_GET_CLASS (data)->copy ==
+                    GIMP_DATA_GET_CLASS (src_data)->copy);
+
+  if (data != src_data)
+    GIMP_DATA_GET_CLASS (data)->copy (data, src_data);
+}
+
+gboolean
+gimp_data_is_duplicatable (GimpData *data)
+{
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+
+  if (GIMP_DATA_GET_CLASS (data)->duplicate == gimp_data_real_duplicate)
+    return gimp_data_is_copyable (data);
+  else
+    return GIMP_DATA_GET_CLASS (data)->duplicate != NULL;
+}
+
+/**
+ * gimp_data_duplicate:
+ * @data: a #GimpData object
+ *
+ * Creates a copy of @data, if possible.  Only the object data is
+ * copied:  the newly created object is not automatically given an
+ * object name, file name, preview, etc.
+ *
+ * Returns: the newly created copy, or %NULL if @data cannot be copied.
+ **/
+GimpData *
+gimp_data_duplicate (GimpData *data)
+{
+  g_return_val_if_fail (GIMP_IS_DATA (data), NULL);
+
+  if (gimp_data_is_duplicatable (data))
+    {
+      GimpData        *new     = GIMP_DATA_GET_CLASS (data)->duplicate (data);
+      GimpDataPrivate *private = GIMP_DATA_GET_PRIVATE (new);
+
+      g_object_set (new,
+                    "name",      NULL,
+                    "writable",  GIMP_DATA_GET_CLASS (new)->save != NULL,
+                    "deletable", TRUE,
+                    NULL);
+
+      g_clear_object (&private->file);
+
+      return new;
+    }
+
+  return NULL;
+}
+
+/**
+ * gimp_data_make_internal:
+ * @data: a #GimpData object.
+ *
+ * Mark @data as "internal" to Gimp, which means that it will not be
+ * saved to disk.  Note that if you do this, later calls to
+ * gimp_data_save() and gimp_data_delete_from_disk() will
+ * automatically return successfully without giving any warning.
+ *
+ * The identifier name shall be an untranslated globally unique string
+ * that identifies the internal object across sessions.
+ **/
+void
+gimp_data_make_internal (GimpData    *data,
+                         const gchar *identifier)
+{
+  GimpDataPrivate *private;
+
+  g_return_if_fail (GIMP_IS_DATA (data));
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  g_clear_object (&private->file);
+
+  g_free (private->identifier);
+  private->identifier = g_strdup (identifier);
+
+  private->writable  = FALSE;
+  private->deletable = FALSE;
+  private->internal  = TRUE;
+}
+
+gboolean
+gimp_data_is_internal (GimpData *data)
+{
+  GimpDataPrivate *private;
+
+  g_return_val_if_fail (GIMP_IS_DATA (data), FALSE);
+
+  private = GIMP_DATA_GET_PRIVATE (data);
+
+  return private->internal;
+}
+
+/**
+ * gimp_data_compare:
+ * @data1: a #GimpData object.
+ * @data2: another #GimpData object.
+ *
+ * Compares two data objects for use in sorting. Objects marked as
+ * "internal" come first, then user-writable objects, then system data
+ * files. In these three groups, the objects are sorted alphabetically
+ * by name, using gimp_object_name_collate().
+ *
+ * Return value: -1 if @data1 compares before @data2,
+ *                0 if they compare equal,
+ *                1 if @data1 compares after @data2.
+ **/
+gint
+gimp_data_compare (GimpData *data1,
+                   GimpData *data2)
+{
+  g_return_val_if_fail (GIMP_IS_DATA (data1), 0);
+  g_return_val_if_fail (GIMP_IS_DATA (data2), 0);
+  g_return_val_if_fail (GIMP_DATA_GET_CLASS (data1)->compare ==
+                        GIMP_DATA_GET_CLASS (data2)->compare, 0);
+
+  return GIMP_DATA_GET_CLASS (data1)->compare (data1, data2);
+}
+
+/**
+ * gimp_data_error_quark:
+ *
+ * This function is used to implement the GIMP_DATA_ERROR macro. It
+ * shouldn't be called directly.
+ *
+ * Return value: the #GQuark to identify error in the GimpData error domain.
+ **/
+GQuark
+gimp_data_error_quark (void)
+{
+  return g_quark_from_static_string ("gimp-data-error-quark");
+}