See also ICDrawBegin, ICM_DECOMPRESS_BEGIN, ICM_DRAW, ICM_DRAW_END, ICM_DRAW_START
wParam = (DWORD) (LPVOID) &icdrwBgn; lParam = sizeof(ICDRAW);
Notifies a rendering driver to prepare to draw data.
ICERR_OK | Indicates no error occurred. |
ICERR_BADFORMAT | Indicates the input or output format is not supported. |
ICERR_NOTSUPPORTED | Indicates the driver does not draw directly to the screen or does not support this message. |
wParam
Address of an ICDRAWBEGIN structure describing the input format.
lParam
Size, in bytes, of the ICDRAWBEGIN structure.
If you want the driver to decompress data into a buffer, send the ICM_DECOMPRESS_BEGIN message.
ICM_DRAW_BEGIN and ICM_DRAW_END 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.