Release xft_data in widget destroy callback to avoid visual distraction

* lwlib/lwlib-int.h (struct _widget_instance) [HAVE_XFT]: Remove nr_xft_data.
* lwlib/lwlib-Xaw.c (find_xft_data, xaw_update_one_widget) [HAVE_XFT]: Loop
while widget member is not NULL instead of using nr_xft_data.
(xaw_destroy_instance) [HAVE_XFT]: Move xft_data release code from here ...
(destroy_xft_data) [HAVE_XFT]: ... to here.
(make_dialog) [HAVE_XFT]: Add destroy_xft_data as destroy callback for dialog.

2 files changed, 24 insertions, 29 deletions

diff --git a/lwlib/lwlib-Xaw.c b/lwlib/lwlib-Xaw.c
index 9655076da9d..a00f8aa73f9 100644
--- a/lwlib/lwlib-Xaw.c
+++ b/lwlib/lwlib-Xaw.c
@@ -113,6 +113,23 @@ fill_xft_data (struct widget_xft_data *data, Widget widget, XftFont *font)
   data->p_width = data->p_height = 0;
 }
 
+static void
+destroy_xft_data (Widget widget, XtPointer closure, XtPointer call_data)
+{
+  struct widget_xft_data *xft_data = closure;
+
+  for (int i = 0; xft_data[i].widget; ++i)
+    {
+      if (xft_data[i].xft_draw)
+	XftDrawDestroy (xft_data[i].xft_draw);
+      if (xft_data[i].p != None)
+	XFreePixmap (XtDisplay (widget), xft_data[i].p);
+    }
+  if (xft_data[0].xft_font)
+    XftFontClose (XtDisplay (widget), xft_data[0].xft_font);
+  xfree (xft_data);
+}
+
 static XftFont*
 openFont (Widget widget, char *name)
 {
@@ -230,7 +247,7 @@ find_xft_data (Widget widget)
     }
   if (!inst || !inst->xft_data || !inst->xft_data[0].xft_font) return 0;
 
-  for (nr = 0; data == NULL && nr < inst->nr_xft_data; ++nr)
+  for (nr = 0; data == NULL && inst->xft_data[nr].widget; ++nr)
     {
       if (inst->xft_data[nr].widget == widget)
         data = &inst->xft_data[nr];
@@ -327,10 +344,10 @@ xaw_update_one_widget (widget_instance *instance,
         {
           int th;
           int nr;
-          for (nr = 0; nr < instance->nr_xft_data; ++nr)
+          for (nr = 0; instance->xft_data[nr].widget; ++nr)
             if (instance->xft_data[nr].widget == widget)
               break;
-          if (nr < instance->nr_xft_data)
+          if (instance->xft_data[nr].widget)
             {
               set_text (&instance->xft_data[nr], instance->parent,
                         val->value, 6);
@@ -361,28 +378,6 @@ xaw_update_one_value (widget_instance *instance,
 void
 xaw_destroy_instance (widget_instance *instance)
 {
-#ifdef HAVE_XFT
-  if (instance->xft_data)
-    {
-      int i;
-      for (i = 0; i < instance->nr_xft_data; ++i)
-        {
-          if (instance->xft_data[i].xft_draw)
-            XftDrawDestroy (instance->xft_data[i].xft_draw);
-          if (instance->xft_data[i].p != None)
-            {
-              XtVaSetValues (instance->xft_data[i].widget, XtNbitmap, None,
-                             NULL);
-              XFreePixmap (XtDisplay (instance->widget),
-                           instance->xft_data[i].p);
-            }
-        }
-      if (instance->xft_data[0].xft_font)
-        XftFontClose (XtDisplay (instance->widget),
-                      instance->xft_data[0].xft_font);
-      xfree (instance->xft_data);
-    }
-#endif
   if (XtIsSubclass (instance->widget, dialogWidgetClass))
     /* Need to destroy the Shell too. */
     XtDestroyWidget (XtParent (instance->widget));
@@ -569,7 +564,6 @@ make_dialog (char* name,
           }
       }
     instance->xft_data = 0;
-    instance->nr_xft_data = 0;
     if (w)
       {
         XtResource rec[] =
@@ -589,11 +583,13 @@ make_dialog (char* name,
 
         if (xft_font)
           {
-            instance->nr_xft_data = left_buttons + right_buttons + 1;
-            instance->xft_data = calloc (instance->nr_xft_data,
+            int nr_xft_data = left_buttons + right_buttons + 1;
+            instance->xft_data = calloc (nr_xft_data + 1,
                                          sizeof(*instance->xft_data));
 
             fill_xft_data (&instance->xft_data[0], w, xft_font);
+	    XtAddCallback (dialog, XtNdestroyCallback, destroy_xft_data,
+			   instance->xft_data);
           }
       }
 
diff --git a/lwlib/lwlib-int.h b/lwlib/lwlib-int.h
index e21fa1f1714..28b1fb9508d 100644
--- a/lwlib/lwlib-int.h
+++ b/lwlib/lwlib-int.h
@@ -32,7 +32,6 @@ typedef struct _widget_instance
   Boolean		pop_up_p;
 #ifdef HAVE_XFT
   struct widget_xft_data *xft_data;
-  int                   nr_xft_data;
 #endif
   struct _widget_info*		info;
   struct _widget_instance*	next;