ecore-evas-buffer: defer resize callback until pre-render

Summary:
this mimics other engines, all of which have the same mechanics due
to display server interactions. it also avoids unnecessary recalcs before
pre-render if the canvas size was changing repeatedly

fix T6924
ref D6019

Reviewers: cedric, JackDanielZ

Reviewed By: JackDanielZ

Subscribers: #committers, JackDanielZ

Tags: #efl

Maniphest Tasks: T6924

Differential Revision: https://phab.enlightenment.org/D6145

src/lib/ecore_evas/ecore_evas_buffer.c

@@ -100,7 +100,8 @@ _ecore_evas_resize(Ecore_Evas *ee, int w, int h)
      }
    if (bdata->image)
       evas_object_image_data_set(bdata->image, bdata->pixels);
-   if (ee->func.fn_resize) ee->func.fn_resize(ee);
+   else
+     bdata->resized = 1;
 }
 
 static void
@@ -163,6 +164,11 @@ _ecore_evas_buffer_prepare(Ecore_Evas *ee)
            _ecore_evas_resize(ee, w, h);
         bdata->pixels = evas_object_image_data_get(bdata->image, 1);
      }
+   else if (bdata->resized)
+     {
+        if (ee->func.fn_resize) ee->func.fn_resize(ee);
+        bdata->resized = 0;
+     }
 
    return EINA_TRUE;
 }

src/lib/ecore_evas/ecore_evas_buffer.h

@@ -10,6 +10,7 @@ struct _Ecore_Evas_Engine_Buffer_Data {
    void *(*alloc_func) (void *data, int size);
    void *data;
    Eina_Bool in_render : 1;
+   Eina_Bool resized : 1;
 };
 
 #endif /* _ECORE_EVAS_BUFFER_PRIVATE_H_ */