Hi Ricardo, On Thu, Oct 24, 2019 at 03:43:36PM +0200, Ricardo Ribalda Delgado wrote: > Hi Sakari > > Lets say the user wants to select the active pixels. He needs to set > the crop and the compose. > > 1) he gets V4L2_SEL_TGT_CROP_DEFAULT > > 2) he sets V4L2_SEL_TGT_CROP > > How does he knows which compose to use? What if the compose starts at > (0,0) instead of (32,32)....? > > I think it is easier if > > 3) he gets V4L2_SEL_TGT_COMPOSE_DEFAULT > > 4) he sets V4L2_SEL_TGT_COMPOSE > > This is similar as how we do it today with a v4l2_device. What if we > simply replicate that behaviour? The compose rectangle is relative to the crop rectangle (if there's a crop rectangle), and always starts at 0,0. See: <URL:https://hverkuil.home.xs4all.nl/spec/uapi/v4l/dev-subdev.html#selections-cropping-scaling-and-composition> -- Sakari Ailus sakari.ailus@xxxxxxxxxxxxxxx
