Convert AgDbChartSave a boxed type

src/ag-chart.c

@@ -1926,7 +1926,7 @@ ag_chart_get_db_save(AgChart *chart, gint db_id)
 {
     GsweCoordinates *coords;
     AgChartPrivate  *priv      = ag_chart_get_instance_private(chart);
-    AgDbChartSave   *save_data = g_new0(AgDbChartSave, 1);
+    AgDbChartSave   *save_data = ag_db_chart_save_new();
     GsweTimestamp   *timestamp = gswe_moment_get_timestamp(GSWE_MOMENT(chart));
     GEnumClass      *house_system_class;
     GEnumValue      *house_system_enum;

src/ag-db.c

@@ -39,6 +39,12 @@ typedef struct _AgDbPrivate {
 G_DEFINE_QUARK(ag_db_error_quark, ag_db_error);
 
 G_DEFINE_TYPE_WITH_PRIVATE(AgDb, ag_db, G_TYPE_OBJECT);
+G_DEFINE_BOXED_TYPE(
+        AgDbChartSave,
+        ag_db_chart_save,
+        (GBoxedCopyFunc)ag_db_chart_save_ref,
+        (GBoxedFreeFunc)ag_db_chart_save_unref
+    );
 
 enum {
     COLUMN_CHART_ID,
@@ -564,7 +570,7 @@ ag_db_get(void)
  *
  * Frees @save_data and all its fields
  */
-void
+static void
 ag_db_chart_save_free(AgDbChartSave *save_data)
 {
     if (!save_data) {
@@ -594,6 +600,30 @@ ag_db_chart_save_free(AgDbChartSave *save_data)
     g_free(save_data);
 }
 
+AgDbChartSave *
+ag_db_chart_save_ref(AgDbChartSave *save_data)
+{
+    if (save_data == NULL) {
+        return NULL;
+    }
+
+    save_data->refcount++;
+
+    return save_data;
+}
+
+void
+ag_db_chart_save_unref(AgDbChartSave *save_data)
+{
+    if (save_data == NULL) {
+        return;
+    }
+
+    if (--save_data->refcount == 0) {
+        ag_db_chart_save_free(save_data);
+    }
+}
+
 /**
  * ag_db_chart_save:
  * @db: the #AgDb object to operate on
@@ -797,6 +827,17 @@ ag_db_chart_save(AgDb *db, AgDbChartSave *save_data,  GError **err)
     return save_success;
 }
 
+AgDbChartSave *
+ag_db_chart_save_new(void)
+{
+    AgDbChartSave *save_data;
+
+    save_data = g_new0(AgDbChartSave, 1);
+    save_data->refcount = 1;
+
+    return save_data;
+}
+
 /**
  * ag_db_chart_get_list:
  * @db: the #AgDb object to operate on
@@ -833,7 +874,7 @@ ag_db_chart_get_list(AgDb *db, GError **err)
 
     while (gda_data_model_iter_move_next(iter)) {
         const GValue  *value;
-        AgDbChartSave *save_data = g_new0(AgDbChartSave, 1);
+        AgDbChartSave *save_data = ag_db_chart_save_new();
 
         value = gda_data_model_iter_get_value_at(iter, 0);
         save_data->db_id = g_value_get_int(value);
@@ -910,7 +951,7 @@ ag_db_chart_get_data_by_id(AgDb *db, guint row_id, GError **err)
         return NULL;
     }
 
-    save_data = g_new0(AgDbChartSave, 1);
+    save_data = ag_db_chart_save_new();
 
     /* id */
     value = gda_data_model_get_value_at(

src/ag-db.h

@@ -65,8 +65,12 @@ typedef struct _AgDbChartSave {
     gdouble timezone;
     gchar *house_system;
     gchar *note;
+    gint refcount;
 } AgDbChartSave;
 
+GType ag_db_chart_save_get_type(void);
+#define AG_TYPE_DB_CHART_SAVE (ag_db_chart_save_get_type())
+
 typedef enum {
     AG_DB_ERROR_NO_CHART,
     AG_DB_ERROR_DATABASE_ERROR,
@@ -76,12 +80,16 @@ GType ag_db_get_type(void) G_GNUC_CONST;
 
 AgDb *ag_db_get(void);
 
-void ag_db_chart_save_free(AgDbChartSave *save_data);
-
 gboolean ag_db_chart_save(AgDb           *db,
                           AgDbChartSave  *save_data,
                           GError         **err);
 
+AgDbChartSave *ag_db_chart_save_new(void);
+
+AgDbChartSave *ag_db_chart_save_ref(AgDbChartSave *save_data);
+
+void ag_db_chart_save_unref(AgDbChartSave *save_data);
+
 GList *ag_db_chart_get_list(AgDb *db, GError **err);
 
 AgDbChartSave *ag_db_chart_get_data_by_id(AgDb *db, guint row_id, GError **err);

src/ag-window.c

@@ -720,7 +720,7 @@ ag_window_recalculate_chart(AgWindow *window, gboolean set_everything)
         gtk_spin_button_update(GTK_SPIN_BUTTON(current));
     }
 
-    edit_data = g_new0(AgDbChartSave, 1);
+    edit_data = ag_db_chart_save_new();
 
     edit_data->db_id = db_id;
 
@@ -798,13 +798,13 @@ ag_window_recalculate_chart(AgWindow *window, gboolean set_everything)
     if (ag_db_chart_save_identical(edit_data, chart_data, !set_everything)) {
         g_debug("No redrawing needed");
 
-        ag_db_chart_save_free(edit_data);
-        ag_db_chart_save_free(chart_data);
+        ag_db_chart_save_unref(edit_data);
+        ag_db_chart_save_unref(chart_data);
 
         return;
     }
 
-    ag_db_chart_save_free(chart_data);
+    ag_db_chart_save_unref(chart_data);
 
     g_debug("Recalculating chart data");
 
@@ -846,7 +846,7 @@ ag_window_recalculate_chart(AgWindow *window, gboolean set_everything)
         ag_chart_set_note(priv->chart, edit_data->note);
     }
 
-    ag_db_chart_save_free(edit_data);
+    ag_db_chart_save_unref(edit_data);
 }
 
 static void
@@ -1257,7 +1257,7 @@ ag_window_can_close(AgWindow *window, gboolean display_dialog)
         }
     }
 
-    ag_db_chart_save_free(save_data);
+    ag_db_chart_save_unref(save_data);
 
     return ret;
 }
@@ -1289,7 +1289,7 @@ ag_window_save_action(GSimpleAction *action,
                 );
         }
 
-        ag_db_chart_save_free(priv->saved_data);
+        ag_db_chart_save_unref(priv->saved_data);
         priv->saved_data = save_data;
     }
 }
@@ -1644,7 +1644,7 @@ ag_window_back_action(GSimpleAction *action,
     if (ag_window_can_close(window, TRUE)) {
         gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(priv->toolbar_aspect), TRUE);
         g_clear_object(&(priv->chart));
-        ag_db_chart_save_free(priv->saved_data);
+        ag_db_chart_save_unref(priv->saved_data);
         priv->saved_data = NULL;
 
         ag_window_load_chart_list(window);
@@ -1931,7 +1931,7 @@ ag_window_list_item_activated_cb(GdMainView        *view,
                 "Error: %s",
                 err->message
             );
-        ag_db_chart_save_free(priv->saved_data);
+        ag_db_chart_save_unref(priv->saved_data);
         priv->saved_data = NULL;
 
         return;
@@ -2657,7 +2657,7 @@ ag_window_set_chart(AgWindow *window, AgChart *chart)
         g_clear_object(&(priv->chart));
     }
 
-    ag_db_chart_save_free(priv->saved_data);
+    ag_db_chart_save_unref(priv->saved_data);
 
     priv->chart = chart;
     g_signal_connect(