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Use Fl_Window::shape(const Fl_Image*) to set the shape of your window.
If you use a PNG image, the doc of that function indicates:
"With an Fl_RGB_Image with an alpha channel (depths 2 or 4), the shaped window covers the image part that is not fully transparent." Thus, fully transparent parts of the png will be out of the window's shape. Please, notice that if you use FLTK 1.3.5 you'll have to set your ABI level to 1.3.3 or above.
Also, I would have put the creation of the shaped window when the donor widget receives the FL_DRAG event rather than FL_PUSH.
Class Fl_Image_Surface can be useful to create the image of the shaped window because it can
produce an image from a widget and its visual display.
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