libcamera: ipu3: Report ScalerCrop in metadata

Report in the Request metadata the scaler crop region as requested by
application through the request controls. No actual scaling is applied
in the pipeline at the moment.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/pipeline/ipu3/ipu3.cpp

@@ -966,6 +966,11 @@ void IPU3CameraData::imguOutputBufferReady(FrameBuffer *buffer)
 	request->metadata().set(controls::draft::PipelineDepth, 3);
 	/* \todo Move the ExposureTime control to the IPA. */
 	request->metadata().set(controls::ExposureTime, exposureTime_);
+	/* \todo Actually apply the scaler crop region to the ImgU. */
+	if (request->controls().contains(controls::ScalerCrop)) {
+		Rectangle cropRegion = request->controls().get(controls::ScalerCrop);
+		request->metadata().set(controls::ScalerCrop, cropRegion);
+	}
 	pipe_->completeRequest(request);
 }