log history memory usage add fix virtual dtor for Action subclasses to be deleted from memory

engine/canvas.h

@@ -157,6 +157,21 @@ public:
             m_canvas->m_layers[m_layer_idx].m_rtt[i].unbindTexture();
         }
     }
+    virtual size_t memory() override
+    {
+        size_t mem = 0;
+        for (int i = 0; i < 6; i++)
+        {
+            glm::vec2 sz = m_box[i].zw() - m_box[i].xy();
+            mem += sz.x * sz.y * 4 + sizeof(*this);
+        }
+        return mem;
+    }
+    virtual ~ActionStroke()
+    {
+        
+        LOG("ActionStroke destroyed: free %zu bytes", memory());
+    }
 };
 
 NS_END