Evas filters: Add return value in filter callback

This will inform the client whether an asynchronous filter properly
rendered or not.

I actually don't know any case where rendering can fail at runtime.

src/lib/evas/canvas/evas_object_text.c

@@ -2024,9 +2024,37 @@ evas_font_draw_async_check(Evas_Object_Protected_Data *obj,
 }
 
 static void
-evas_object_text_render(Evas_Object *eo_obj EINA_UNUSED,
-			Evas_Object_Protected_Data *obj,
-			void *type_private_data,
+_filter_cb(Evas_Filter_Context *ctx, void *data, Eina_Bool success)
+{
+   Eo *eo_obj = data;
+
+   // Destroy context as we won't reuse it.
+   evas_filter_context_destroy(ctx);
+
+   // Redraw text with normal styles in case of failure
+   if (!success)
+     {
+        Evas_Object_Protected_Data *obj = eo_data_scope_get(eo_obj, EVAS_OBJ_CLASS);
+        Evas_Object_Text *o = (Evas_Object_Text *) obj->private_data;
+
+        ERR("Filter failed at runtime!");
+        o->cur.filter.invalid = EINA_TRUE;
+
+        // Update object
+        _evas_object_text_items_clear(o);
+        o->changed = 1;
+        _evas_object_text_recalc(eo_obj, o->cur.text);
+        evas_object_change(eo_obj, obj);
+        evas_object_clip_dirty(eo_obj, obj);
+        evas_object_coords_recalc(eo_obj, obj);
+        evas_object_inform_call_resize(eo_obj);
+     }
+}
+
+static void
+evas_object_text_render(Evas_Object *eo_obj,
+                        Evas_Object_Protected_Data *obj,
+                        void *type_private_data,
                         void *output, void *context, void *surface,
                         int x, int y, Eina_Bool do_async)
 {
@@ -2244,7 +2272,7 @@ evas_object_text_render(Evas_Object *eo_obj EINA_UNUSED,
         ENFN->context_free(ENDT, filter_ctx);
 
         // Add post-run callback and run filter
-        evas_filter_context_autodestroy(filter);
+        evas_filter_context_post_run_callback_set(filter, _filter_cb, eo_obj);
         ok = evas_filter_run(filter);
         o->cur.filter.changed = EINA_FALSE;
 

src/lib/evas/filters/evas_filter.c

@@ -1719,10 +1719,10 @@ static void
 _filter_thread_run_cb(void *data)
 {
    Evas_Filter_Context *ctx = data;
+   Eina_Bool success;
    void *buffer;
 
-   // TODO: Add return value check and call error cb
-   _filter_chain_run(ctx);
+   success = _filter_chain_run(ctx);
 
    EINA_LIST_FREE(ctx->post_run.buffers_to_free, buffer)
      {
@@ -1731,7 +1731,7 @@ _filter_thread_run_cb(void *data)
      }
 
    if (ctx->post_run.cb)
-     ctx->post_run.cb(ctx, ctx->post_run.data);
+     ctx->post_run.cb(ctx, ctx->post_run.data, success);
 }
 
 Eina_Bool
@@ -1755,6 +1755,6 @@ evas_filter_run(Evas_Filter_Context *ctx)
 
    ret = _filter_chain_run(ctx);
    if (ctx->post_run.cb)
-     ctx->post_run.cb(ctx, ctx->post_run.data);
+     ctx->post_run.cb(ctx, ctx->post_run.data, ret);
    return ret;
 }

src/lib/evas/include/evas_filter.h

@@ -19,7 +19,7 @@ typedef enum _Evas_Filter_Fill_Mode Evas_Filter_Fill_Mode;
 typedef enum _Evas_Filter_Transform_Flags Evas_Filter_Transform_Flags;
 
 typedef Eina_Bool (* Evas_Filter_Apply_Func) (Evas_Filter_Command *cmd);
-typedef void (* Evas_Filter_Cb) (Evas_Filter_Context *ctx, void *data);
+typedef void (* Evas_Filter_Cb) (Evas_Filter_Context *ctx, void *data, Eina_Bool success);
 
 #define EVAS_FILTER_BUFFER_RGBA  EINA_FALSE
 #define EVAS_FILTER_BUFFER_ALPHA EINA_TRUE