ICM_DRAW_BEGIN - Win32 Multimedia Programmer's Reference

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ICM_DRAW_BEGIN

The ICM_DRAW_BEGIN message notifies a rendering driver to prepare to draw data.

ICM_DRAW_BEGIN

wParam = (DWORD) (LPVOID) &icdrwBgn;

lParam = sizeof(ICDRAW);

Parameters
icdrwBgn

Address of an ICDRAWBEGIN structure containing the input format.

lParam

Size, in bytes, of ICDRAWBEGIN.

Return Values
Returns ICERR_OK if the driver supports drawing the data to the screen in the specified manner and format, or an error code otherwise. Possible error values include the following:

ICERR_BADFORMAT	Input or output format is not supported.
ICERR_NOTSUPPORTED	Driver does not draw directly to the screen or does not support this message.

Remarks
If you want the driver to decompress data into a buffer, send the ICM_DECOMPRESS_BEGIN message.

The ICM_DRAW_BEGIN and ICM_DRAW_END messages do not nest. If your driver receives ICM_DRAW_BEGIN before decompression is stopped with ICM_DRAW_END, it should restart decompression with new parameters.

See Also
ICDRAWBEGIN, ICM_DECOMPRESS_BEGIN, ICM_DRAW_END

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