procedure Changed;
procedure Changed(const Rect: TRect);
Will mark the layer for update and calls the OnChange event, provided the change notification is not masked with BeginUpdate. If a rectangle of the changed area (Rect) is set, only this area will be updated - provided the RepaintMode of the owning TCustomImage32 instance is set to rmOptimizer.
Using Layers, TNotifiablePersistent.OnChange, TNotifiablePersistent.BeginUpdate, Rectangle Types, TCustomImage32, TCustomPaintBox32.RepaintMode, TRepaintMode, Update, TLayerCollection.Owner
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