Scrollbars can be useful whenever the display rectangle is larger than the window's client area. This is an alternative to making the displayed image fit the window.
If you are not using LBitmapWindow, the following instructions describe how to implement scrollbars, turning them on when they are required and turning them off when they are not.
In your function for processing the WM_SIZE message, you can add code to show or hide the scrollbars, as needed, and adjust the scrollbar ranges and positions.
In your functions for processing WM_HSCROLL and WM_VSCROLL messages, add this code.
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