The ICM_DRAW message notifies a rendering driver to decompress a frame of data
and draw it to the screen.
wParam = (DWORD) (LPVOID) &icdraw;
lParam = sizeof(ICDRAW);
Address of an ICDRAW
Size, in bytes, of ICDRAW
Returns ICERR_OK if successful or an error otherwise.
If the ICDRAW_UPDATE flag is set in the dwFlags
member of ICDRAW
, the area of the screen used for drawing is invalid and needs to be updated.
The extent of updating depends on the contents of the lpData
is NULL, the driver should update the entire destination rectangle with the
current image. If the driver maintains a copy of the image in an off-screen
buffer, it can fail this message. If lpData
is not NULL, the driver should draw the data and make sure the entire
destination is updated.
If the ICDRAW_HURRYUP flag is set in dwFlags
, the calling application wants the driver to proceed as quickly as possible,
possibly not even updating the screen.
If the ICDRAW_PREROLL flag is set in dwFlags
, this video frame is preliminary information and should not be displayed if
possible. For example, if play is to start from frame 10, and frame 0 is the
nearest previous key frame, frames 0 through 9 will have ICDRAW_PREROLL set.
If you want the driver to decompress data into a buffer, send the
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