ecore_wl2: Add buffer_age_get API and use it in surface code

src/lib/ecore_wl2/Ecore_Wl2.h

@@ -2009,6 +2009,7 @@ EAPI void ecore_wl2_buffer_unlock(Ecore_Wl2_Buffer *b);
 EAPI void ecore_wl2_buffer_destroy(Ecore_Wl2_Buffer *b);
 EAPI Eina_Bool ecore_wl2_buffer_busy_get(Ecore_Wl2_Buffer *buffer);
 EAPI void ecore_wl2_buffer_busy_set(Ecore_Wl2_Buffer *buffer);
+EAPI int ecore_wl2_buffer_age_get(Ecore_Wl2_Buffer *buffer);
 
 EAPI Ecore_Wl2_Surface *ecore_wl2_surface_create(Ecore_Wl2_Window *win, Eina_Bool alpha);
 EAPI void ecore_wl2_surface_destroy(Ecore_Wl2_Surface *surface);

src/lib/ecore_wl2/ecore_wl2_buffer.c

@@ -688,6 +688,14 @@ ecore_wl2_buffer_busy_set(Ecore_Wl2_Buffer *buffer)
    buffer->busy = EINA_TRUE;
 }
 
+EAPI int
+ecore_wl2_buffer_age_get(Ecore_Wl2_Buffer *buffer)
+{
+   EINA_SAFETY_ON_NULL_RETURN_VAL(buffer, 0);
+
+   return buffer->age;
+}
+
 static Ecore_Wl2_Buffer *
 _ecore_wl2_buffer_partial_create(int w, int h, Eina_Bool alpha)
 {

src/lib/ecore_wl2/ecore_wl2_surface.c

@@ -84,14 +84,16 @@ _evas_dmabuf_surface_wait(Ecore_Wl2_Surface *s)
    Ecore_Wl2_Buffer *b, *best = NULL;
    Eina_List *l;
    int best_age = -1;
+   int age;
 
    EINA_LIST_FOREACH(s->buffers, l, b)
      {
         if (ecore_wl2_buffer_busy_get(b)) continue;
-        if (b->age > best_age)
+        age = ecore_wl2_buffer_age_get(b);
+        if (age > best_age)
           {
              best = b;
-             best_age = b->age;
+             best_age = age;
           }
      }
 
@@ -132,7 +134,7 @@ _evas_dmabuf_surface_assign(Ecore_Wl2_Surface *s)
    EINA_LIST_FOREACH(s->buffers, l, b)
      b->age++;
 
-   return s->current->age;
+   return ecore_wl2_buffer_age_get(s->current);
 }
 
 static void