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Is create layer context cheap?

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I am creating a CAD like application. I usually have all the shapes together in a display list and draw the list. But for the current tool, I need to show live preview, e.g. when the user has selected circle, and then picking the second point, he moves the mouse, the circle preview will be shown. Can i use layercontext for that, so that i need to clear everything and draw again. Is it cheaper or costly? Why I am worried is because, the application is not just simply CAD app, it has other threads which are very resource intensive

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