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st-texture-cache: Cancel sliced image loading on target actor destroy

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It might happen that the target clutter actor that we return on call
of st_texture_cache_load_sliced_image might be destroyed while the
loading task is still running. To protect from this, let's connect
to "destroy" signal and when this happens we use a cancellable to
stop the task.

This allows to safely reuse the return value of this function to
cancel the execution and avoiding that load_callback is called
even for a request that is not anymore under our control.

https://bugzilla.gnome.org/show_bug.cgi?id=765011
This commit is contained in:
Marco Trevisan (Treviño) 2017-11-30 02:48:02 +01:00 committed by Jonas Ådahl
parent 2c17c186b8
commit e3c5c9a2e7
1 changed files with 26 additions and 4 deletions
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30
src/st/st-texture-cache.c
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@ -1080,6 +1080,7 @@ typedef struct {
gint paint_scale;
gfloat resource_scale;
ClutterActor *actor;
GCancellable *cancellable;
GFunc load_callback;
gpointer load_callback_data;
} AsyncImageData;
@ -1090,9 +1091,20 @@ on_data_destroy (gpointer data)
AsyncImageData *d = (AsyncImageData *)data;
g_object_unref (d->gfile);
g_object_unref (d->actor);
g_object_unref (d->cancellable);
g_free (d);
}
static void
on_sliced_image_actor_destroyed (ClutterActor *actor,
gpointer data)
{
GTask *task = data;
GCancellable *cancellable = g_task_get_cancellable (task);
g_cancellable_cancel (cancellable);
}
static void
on_sliced_image_loaded (GObject *source_object,
GAsyncResult *res,
@ -1103,7 +1115,7 @@ on_sliced_image_loaded (GObject *source_object,
GTask *task = G_TASK (res);
GList *list, *pixbufs;
if (g_task_had_error (task))
if (g_task_had_error (task) || g_cancellable_is_cancelled (data->cancellable))
return;
pixbufs = g_task_propagate_pointer (task, NULL);
@ -1119,6 +1131,10 @@ on_sliced_image_loaded (GObject *source_object,
g_list_free_full (pixbufs, g_object_unref);
g_signal_handlers_disconnect_by_func (data->actor,
on_sliced_image_actor_destroyed,
task);
if (data->load_callback != NULL)
data->load_callback (cache, data->load_callback_data);
}
@ -1157,7 +1173,7 @@ load_sliced_image (GTask *result,
gchar *buffer = NULL;
gsize length;
g_assert (!cancellable);
g_assert (cancellable);
data = task_data;
g_assert (data);
@ -1165,7 +1181,7 @@ load_sliced_image (GTask *result,
loader = gdk_pixbuf_loader_new ();
g_signal_connect (loader, "size-prepared", G_CALLBACK (on_loader_size_prepared), data);
if (!g_file_load_contents (data->gfile, NULL, &buffer, &length, NULL, &error))
if (!g_file_load_contents (data->gfile, cancellable, &buffer, &length, NULL, &error))
{
g_warning ("Failed to open sliced image: %s", error->message);
goto out;
@ -1235,6 +1251,7 @@ st_texture_cache_load_sliced_image (StTextureCache *cache,
AsyncImageData *data;
GTask *result;
ClutterActor *actor = clutter_actor_new ();
GCancellable *cancellable = g_cancellable_new ();
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_assert (paint_scale > 0);
@ -1247,11 +1264,16 @@ st_texture_cache_load_sliced_image (StTextureCache *cache,
data->resource_scale = resource_scale;
data->gfile = g_object_ref (file);
data->actor = actor;
data->cancellable = cancellable;
data->load_callback = load_callback;
data->load_callback_data = user_data;
g_object_ref (G_OBJECT (actor));
result = g_task_new (cache, NULL, on_sliced_image_loaded, data);
result = g_task_new (cache, cancellable, on_sliced_image_loaded, data);
g_signal_connect (actor, "destroy",
G_CALLBACK (on_sliced_image_actor_destroyed), result);
g_task_set_task_data (result, data, on_data_destroy);
g_task_run_in_thread (result, load_sliced_image);