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ICM_DECOMPRESSEX_BEGIN
The ICM_DECOMPRESSEX_BEGIN message notifies a video compression driver to
prepare to decompress data.
ICM_DECOMPRESSEX_BEGIN
wParam = (DWORD) (LPVOID) &icdex;
lParam = sizeof(ICDECOMPRESSEX);
Parameters
icdex
Address of a ICDECOMPRESSEX structure containing the input and output formats.
lParam
Size, in bytes, of ICDECOMPRESSEX.
Return Values
Returns ICERR_OK if the specified decompression is supported or
ICERR_BADFORMAT otherwise.
Remarks
When the driver receives this message, it should allocate buffers and do any
time-consuming operations so that it can process ICM_DECOMPRESSEX messages efficiently.
If you want the driver to decompress data directly to the screen, send the
ICM_DRAW_BEGIN message.
The ICM_DECOMPRESSEX_BEGIN and ICM_DECOMPRESSEX_END messages do not nest. If
your driver receives ICM_DECOMPRESSEX_BEGIN before decompression is stopped with
ICM_DECOMPRESSEX_END, it should restart decompression with new parameters.
See Also
ICDECOMPRESSEX, ICM_DECOMPRESSEX, ICM_DECOMPRESSEX_END, ICM_DRAW_BEGIN
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