Share via

ICM_DRAW_WINDOW

  • Article

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

Pointer to 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.

Requirements

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Vfw.h.

See Also

Video Compression Manager, Video Compression Messages, ICDrawWindow, ICM_DRAW_BEGIN