ICM_DRAW_WINDOW

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 macro.

ICM_DRAW_WINDOW 
wParam = (DWORD) (LPVOID) prc; 
lParam = 0; 
 

Parameters

prc

Address of the destination rectangle in screen coordinates. If this parameter points to an empty rectangle, drawing should be turned off.

Return Values

Returns ICERR_OK if successful or an error otherwise.

Remarks

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.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in vfw.h.

See Also

Video Compression Manager Overview, Video Compression Messages, ICDrawWindow, ICM_DRAW_BEGIN