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I want to implement a rubber function just like photoshop, but I hope the rubber just to erase the shapes that drawed on background without modifying the background. Now the background is a image so I can’t use the brush with the single color.
You need to store each layer of the image in its own buffer, and then combine them to output it. So the background would be in one Image object and the shape would be in another Image object. When you get the WM_Paint message, you would have to combine both images into one and output that (or you would have to have the images pre-combined in a third Image object in memory).