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Offscreen VS RenderTarget

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Hi, Until now I used offscreensurfaces to manipulate some pictures "off the screen". Now it seems that I can't draw a texture to an offscreen surface, I can only use StretchRect and similar functions. Please correct me if I'm wrong. Drawing primitives seems to be much faster than stretching data between the surfaces but since I can't use such drawing functions with offscreen surfaces I got the idea to use render target surfaces. I could paint textures, primitives and so on between them, right? So, but where is the difference? If I can do the much more perfomant primitiv drawing off the screen with rendertargets why use offscreensurfaces at all? Thanks in advance.

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