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291f9cb826
MMAL and video_render used not to allow the client to set the column stride or the chroma offset. format->es->video.width wasn't actually being used for anything as mmal_encoding_width_to_stride returns 0 meaning the component has to compute it. Add an extra flag for format->flags (MMAL_ES_FORMAT_FLAG_COL_FMTS_WIDTH_IS_COL_STRIDE) that treats format->es->video.width as the column stride instead of being ignored. video_render also used to ignore nSliceHeight (format->es->video.width) on the column formats. Adding support in setting that (via vc_image vpitch) means that you can crop down a larger image with the chroma in a different place. eg width=(col stride), height=2160, crop.width=1920, crop.height=1080 flags = MMAL_ES_FORMAT_FLAG_COL_FMTS_WIDTH_IS_COL_STRIDE will display the top left 1080p image out of a 4k source image.