Layered window: Why's the edge rounded automatically?

Question

I am trying to draw a hbitmap with a layeredwindow directly onto the screen. this also works now how it should, yet the left upper corner of the image is always rounded.

I'm creating the window with:

    HWND hWnd = CreateWindowEx(WS_EX_LAYERED | WS_EX_TRANSPARENT
        , szWindowClass, 0, 
        WS_VISIBLE
        , 150,250, width, height, 0, NULL, hInstance, NULL);

Could anyone help me please to solve this problem?

Answer 1

You are using WS_VISIBLE as the window style, which is equivalent to WS_OVERLAPPED | WS_VISIBLE WS_OVERLAPPED | WS_VISIBLE . Overlapped windows have rounded corners at the top.

Use WS_POPUP | WS_VISIBLE WS_POPUP | WS_VISIBLE instead.