The ICM_DRAW_WINDOW message notifies a rendering driver that the window
specified for the ICM_DRAW_BEGIN
message needs to be redrawn. The window has moved or become temporarily
obscured. You can send this message explicitly or by using the ICDrawWindow
wParam = (DWORD) (LPVOID) prc;
lParam = 0;
Address of the destination rectangle in screen coordinates. If this parameter
points to an empty rectangle, drawing should be turned off.
Returns ICERR_OK if successful or an error otherwise.
This message is supported by hardware that performs its own asynchronous
decompression, timing, and drawing.
Video-overlay drivers use this message to draw when the window is obscured or
moved. When a window specified for ICM_DRAW_BEGIN is completely hidden by other
windows, the destination rectangle is empty. Drivers should turn off
video-overlay hardware when this condition occurs.
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