libcamera: pipeline: raspberrypi: Fix scaler crop when sensor is configured

We must calculate the initial scaler crop when the camera is
configured, otherwise the metadata will report this rectangle as being
all zeroes.

Because the calculation is identical to that performed later in handling
the scaler crop control, we factor it into a small helper function,
RPiCameraData::scaleIspCrop.

Signed-off-by: David Plowman <[email protected]>

Author: davidplowman

src/libcamera/pipeline/raspberrypi/raspberrypi.cpp

@@ -212,6 +212,7 @@ class RPiCameraData : public Camera::Private
 	void handleStreamBuffer(FrameBuffer *buffer, RPi::Stream *stream);
 	void handleExternalBuffer(FrameBuffer *buffer, RPi::Stream *stream);
 	void handleState();
+	Rectangle scaleIspCrop(const Rectangle &ispCrop) const;
 	void applyScalerCrop(const ControlList &controls);
 
 	std::unique_ptr<ipa::RPi::IPAProxyRPi> ipa_;
@@ -887,6 +888,9 @@ int PipelineHandlerRPi::configure(Camera *camera, CameraConfiguration *config)
 	if (ret)
 		LOG(RPI, Error) << "Failed to configure the IPA: " << ret;
 
+	/* Set the scaler crop to the value we are using (scaled to native sensor coordinates). */
+	data->scalerCrop_ = data->scaleIspCrop(data->ispCrop_);
+
 	/*
 	 * Configure the Unicam embedded data output format only if the sensor
 	 * supports it.
@@ -1974,6 +1978,18 @@ void RPiCameraData::checkRequestCompleted()
 	}
 }
 
+Rectangle RPiCameraData::scaleIspCrop(const Rectangle &ispCrop) const
+{
+	/*
+	 * Scale a crop rectangle defined in the ISP's coordinates into native sensor
+	 * coordinates.
+	 */
+	Rectangle nativeCrop = ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
+						sensorInfo_.outputSize);
+	nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
+	return nativeCrop;
+}
+
 void RPiCameraData::applyScalerCrop(const ControlList &controls)
 {
 	if (controls.contains(controls::ScalerCrop)) {
@@ -2006,9 +2022,7 @@ void RPiCameraData::applyScalerCrop(const ControlList &controls)
 			 * used. But we must first rescale that from ISP (camera mode) pixels
 			 * back into sensor native pixels.
 			 */
-			scalerCrop_ = ispCrop_.scaledBy(sensorInfo_.analogCrop.size(),
-							sensorInfo_.outputSize);
-			scalerCrop_.translateBy(sensorInfo_.analogCrop.topLeft());
+			scalerCrop_ = scaleIspCrop(ispCrop_);
 		}
 	}
 }