[gnome-photos] base-item: Rework PhotosBaseItemSaveData to be more flexible

[Debarshi Ray <debarshir src gnome org>]

commit 2aeb904aa95ae667badde937b10201e4f6a5f4a4
Author: Debarshi Ray <debarshir gnome org>
Date:   Sun Jan 3 13:32:00 2016 +0100

    base-item: Rework PhotosBaseItemSaveData to be more flexible
    
    This will be used by the following patch to carry the MIME type of the
    item whose size is being guessed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759363

 src/photos-base-item.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)
---
diff --git a/src/photos-base-item.c b/src/photos-base-item.c
index 6cdb510..2253567 100644
--- a/src/photos-base-item.c
+++ b/src/photos-base-item.c
@@ -144,13 +144,20 @@ static void photos_base_item_populate_from_cursor (PhotosBaseItem *self, Tracker
 
 
 static PhotosBaseItemSaveData *
-photos_base_item_save_data_new (GFile *dir, const gchar *type)
+photos_base_item_save_data_new (GFile *dir, GeglBuffer *buffer, const gchar *type)
 {
   PhotosBaseItemSaveData *data;
 
   data = g_slice_new0 (PhotosBaseItemSaveData);
-  data->dir = g_object_ref (dir);
+
+  if (dir != NULL)
+    data->dir = g_object_ref (dir);
+
+  if (buffer != NULL)
+    data->buffer = g_object_ref (buffer);
+
   data->type = g_strdup (type);
+
   return data;
 }
 
@@ -158,7 +165,7 @@ photos_base_item_save_data_new (GFile *dir, const gchar *type)
 static void
 photos_base_item_save_data_free (PhotosBaseItemSaveData *data)
 {
-  g_object_unref (data->dir);
+  g_clear_object (&data->dir);
   g_clear_object (&data->buffer);
   g_free (data->type);
   g_slice_free (PhotosBaseItemSaveData, data);
@@ -2171,7 +2178,7 @@ photos_base_item_save_async (PhotosBaseItem *self,
   else
     type = "jpeg";
 
-  data = photos_base_item_save_data_new (dir, type);
+  data = photos_base_item_save_data_new (dir, NULL, type);
 
   task = g_task_new (self, cancellable, callback, user_data);
   g_task_set_source_tag (task, photos_base_item_save_async);