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This would be very useful for my game. Every pixel of the curor is the inverted color of the background. There is such a thing in Minecraft. Is this possible in GM?
For Minecraft-style inverting crosshair you would draw a white-on-transparent cursor to a surface in Draw GUI event, and then draw a part of application_surface to it with bm_subtract blend mode and draw_set_color_write_enable of 1,1,1,0 (so that it doesn't modify alpha channel). Then draw that surface.