The ICM_DECOMPRESSEX message is sent to a video compression driver to decompress a frame of data directly to the screen, decompress to an upside-down DIB, or decompress images described with source and destination rectangles. This message is similar to ICM_DECOMPRESS, except that it uses the ICDECOMPRESSEX structure to decompression information.
Returns ICERR_OK if successful. Otherwise, returns an error number.
If the driver is to decompress data directly to the screen instead of a buffer, it receives the ICM_DRAW message.
The driver should return an error if this message is received before the ICM_DECOMPRESSEX_BEGIN message.