about the function alt_video_display_register_written_buffer()

Hi,

Everyone,

Does anyone learn the "picture viewer" program? I have found that the function alt_video_display_register_written_buffer() has never been used in all the files!

I am not sure about the usage of this function.But what the program does is just putting the data into the buffer and never calls this function to make it display.Why?In order to display,we only need to put the data into the buffer?We do not need to call that function?

Thanks very much...