ICDraw

The ICDraw function decompresses an image for drawing.

DWORD ICDraw(
  HIC hic,          
  DWORD dwFlags,    
  LPVOID lpFormat,  
  LPVOID lpData,    
  DWORD cbData,     
  LONG lTime        
);
 

Parameters

hic

Handle of an decompressor.

dwFlags

Decompression flags. The following values are defined:

ICDRAW_HURRYUP

Data is buffered and not drawn to the screen. Use this flag for fastest decompression.

ICDRAW_NOTKEYFRAME

Current frame is not a key frame.

ICDRAW_NULLFRAME

Current frame does not contain any data and the previous frame should be redrawn.

ICDRAW_PREROLL

Current frame of video occurs before playback should start. For example, if playback will begin on frame 10, and frame 0 is the nearest previous key frame, frames 0 through 9 are sent to the driver with the ICDRAW_PREROLL flag set. The driver needs this data to display frame 10 properly.

ICDRAW_UPDATE

Updates the screen based on previously received data. Set lpData to NULL when this flag is used.

lpFormat

Address of a BITMAPINFOHEADER structure containing the input format of the data.

lpData

Address of the input data.

cbData

Size of the input data, in bytes.

lTime

Time, in samples, to draw this frame. The units for video data are frames. For a definition of the playback rate, see the dwRate and dwScale members of the ICDRAWBEGIN structure.

Return Values

Returns ICERR_OK if successful or an error otherwise.

Remarks

You can initiate drawing the frames by sending the ICM_DRAW_START message (or by using the ICDrawStart macro). The application should be sure to buffer the required number of frames before drawing is started. Send the KM_GETBUFFERSWANTED message (or use the ICGetBuffersWanted macro) to obtain this value.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in vfw.h.
  Import Library: Use vfw32.lib.

See Also

Video Compression Manager Overview, Video Compression Functions, BITMAPINFOHEADER, ICDRAWBEGIN, ICM_DRAW_START