i see the app note in the RDK 4.0 about OSD
OSD window parameters for each channel belonging to structure AlgLink_OsdChWinParams can be changed run
time. AlgLink supports only one single cmd ALG_LINK_OSD_CMD_SET_CHANNEL_WIN_PRM for all
parameter changes for osdLink. osdLink copies entire AlgLink_OsdChWinParams structure passed to it by A8 in it’s
internal state, so user should make sure that all other window parameters that did not require changes have
valid original data.
i don't understand what is the note meaning?