Import Upstream version 2.72.4
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gio/gloadableicon.c
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gio/gloadableicon.c
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/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include "gicon.h"
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#include "gloadableicon.h"
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#include "gasyncresult.h"
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#include "gtask.h"
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#include "glibintl.h"
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/**
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* SECTION:gloadableicon
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* @short_description: Loadable Icons
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* @include: gio/gio.h
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* @see_also: #GIcon, #GThemedIcon
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*
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* Extends the #GIcon interface and adds the ability to
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* load icons from streams.
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**/
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static void g_loadable_icon_real_load_async (GLoadableIcon *icon,
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int size,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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static GInputStream *g_loadable_icon_real_load_finish (GLoadableIcon *icon,
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GAsyncResult *res,
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char **type,
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GError **error);
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typedef GLoadableIconIface GLoadableIconInterface;
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G_DEFINE_INTERFACE(GLoadableIcon, g_loadable_icon, G_TYPE_ICON)
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static void
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g_loadable_icon_default_init (GLoadableIconIface *iface)
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{
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iface->load_async = g_loadable_icon_real_load_async;
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iface->load_finish = g_loadable_icon_real_load_finish;
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}
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/**
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* g_loadable_icon_load:
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* @icon: a #GLoadableIcon.
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* @size: an integer.
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* @type: (out) (optional): a location to store the type of the loaded
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* icon, %NULL to ignore.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to
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* ignore.
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* @error: a #GError location to store the error occurring, or %NULL
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* to ignore.
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*
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* Loads a loadable icon. For the asynchronous version of this function,
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* see g_loadable_icon_load_async().
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*
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* Returns: (transfer full): a #GInputStream to read the icon from.
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**/
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GInputStream *
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g_loadable_icon_load (GLoadableIcon *icon,
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int size,
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char **type,
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GCancellable *cancellable,
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GError **error)
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{
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GLoadableIconIface *iface;
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g_return_val_if_fail (G_IS_LOADABLE_ICON (icon), NULL);
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iface = G_LOADABLE_ICON_GET_IFACE (icon);
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return (* iface->load) (icon, size, type, cancellable, error);
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}
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/**
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* g_loadable_icon_load_async:
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* @icon: a #GLoadableIcon.
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* @size: an integer.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @callback: (scope async): a #GAsyncReadyCallback to call when the
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* request is satisfied
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* @user_data: (closure): the data to pass to callback function
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*
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* Loads an icon asynchronously. To finish this function, see
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* g_loadable_icon_load_finish(). For the synchronous, blocking
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* version of this function, see g_loadable_icon_load().
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**/
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void
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g_loadable_icon_load_async (GLoadableIcon *icon,
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int size,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GLoadableIconIface *iface;
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g_return_if_fail (G_IS_LOADABLE_ICON (icon));
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iface = G_LOADABLE_ICON_GET_IFACE (icon);
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(* iface->load_async) (icon, size, cancellable, callback, user_data);
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}
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/**
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* g_loadable_icon_load_finish:
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* @icon: a #GLoadableIcon.
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* @res: a #GAsyncResult.
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* @type: (out) (optional): a location to store the type of the loaded
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* icon, %NULL to ignore.
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* @error: a #GError location to store the error occurring, or %NULL to
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* ignore.
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*
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* Finishes an asynchronous icon load started in g_loadable_icon_load_async().
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*
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* Returns: (transfer full): a #GInputStream to read the icon from.
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**/
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GInputStream *
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g_loadable_icon_load_finish (GLoadableIcon *icon,
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GAsyncResult *res,
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char **type,
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GError **error)
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{
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GLoadableIconIface *iface;
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g_return_val_if_fail (G_IS_LOADABLE_ICON (icon), NULL);
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g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
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if (g_async_result_legacy_propagate_error (res, error))
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return NULL;
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iface = G_LOADABLE_ICON_GET_IFACE (icon);
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return (* iface->load_finish) (icon, res, type, error);
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}
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/********************************************
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* Default implementation of async load *
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********************************************/
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typedef struct {
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int size;
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char *type;
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} LoadData;
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static void
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load_data_free (LoadData *data)
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{
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g_free (data->type);
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g_free (data);
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}
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static void
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load_async_thread (GTask *task,
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gpointer source_object,
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gpointer task_data,
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GCancellable *cancellable)
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{
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GLoadableIcon *icon = source_object;
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LoadData *data = task_data;
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GLoadableIconIface *iface;
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GInputStream *stream;
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GError *error = NULL;
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iface = G_LOADABLE_ICON_GET_IFACE (icon);
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stream = iface->load (icon, data->size, &data->type,
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cancellable, &error);
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if (stream)
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g_task_return_pointer (task, stream, g_object_unref);
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else
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g_task_return_error (task, error);
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}
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static void
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g_loadable_icon_real_load_async (GLoadableIcon *icon,
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int size,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GTask *task;
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LoadData *data;
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task = g_task_new (icon, cancellable, callback, user_data);
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g_task_set_source_tag (task, g_loadable_icon_real_load_async);
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data = g_new0 (LoadData, 1);
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g_task_set_task_data (task, data, (GDestroyNotify) load_data_free);
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g_task_run_in_thread (task, load_async_thread);
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g_object_unref (task);
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}
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static GInputStream *
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g_loadable_icon_real_load_finish (GLoadableIcon *icon,
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GAsyncResult *res,
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char **type,
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GError **error)
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{
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GTask *task;
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LoadData *data;
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GInputStream *stream;
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g_return_val_if_fail (g_task_is_valid (res, icon), NULL);
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task = G_TASK (res);
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data = g_task_get_task_data (task);
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stream = g_task_propagate_pointer (task, error);
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if (stream && type)
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{
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*type = data->type;
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data->type = NULL;
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}
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return stream;
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}
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