android: camera_device: Handle SCALER_CROP_REGION

Handle the SCALER_CROP_REGION control and dynamic metadata by
translating it from the Android format to the associated libcamera
control when processing a request, and the other way around when
handling a request completion.

Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/android/camera_device.cpp

@@ -1593,6 +1593,26 @@ FrameBuffer *CameraDevice::createFrameBuffer(const buffer_handle_t camera3buffer
 	return new FrameBuffer(std::move(planes));
 }
 
+int CameraDevice::processControls(Camera3RequestDescriptor *descriptor)
+{
+	const CameraMetadata &settings = descriptor->settings_;
+	if (!settings.isValid())
+		return 0;
+
+	/* Translate the Android request settings to libcamera controls. */
+	camera_metadata_ro_entry_t entry;
+	if (settings.getEntry(ANDROID_SCALER_CROP_REGION, &entry)) {
+		const int32_t *data = entry.data.i32;
+		Rectangle cropRegion{ data[0], data[1],
+				      static_cast<unsigned int>(data[2]),
+				      static_cast<unsigned int>(data[3]) };
+		ControlList &controls = descriptor->request_->controls();
+		controls.set(controls::ScalerCrop, cropRegion);
+	}
+
+	return 0;
+}
+
 int CameraDevice::processCaptureRequest(camera3_capture_request_t *camera3Request)
 {
 	if (!camera3Request) {
@@ -1689,7 +1709,14 @@ int CameraDevice::processCaptureRequest(camera3_capture_request_t *camera3Reques
 						camera3Buffer->acquire_fence);
 	}
 
-	/* Queue the request to the CameraWorker. */
+	/*
+	 * Translate controls from Android to libcamera and queue the request
+	 * to the CameraWorker thread.
+	 */
+	int ret = processControls(descriptor);
+	if (ret)
+		return ret;
+
 	worker_.queueRequest(descriptor->request_.get());
 
 	return 0;
@@ -1868,11 +1895,6 @@ CameraDevice::getResultMetadata(Camera3RequestDescriptor *descriptor,
 	const uint8_t lens_state = ANDROID_LENS_STATE_STATIONARY;
 	resultMetadata->addEntry(ANDROID_LENS_STATE, &lens_state, 1);
 
-	int32_t sensorSizes[] = {
-		0, 0, 2560, 1920,
-	};
-	resultMetadata->addEntry(ANDROID_SCALER_CROP_REGION, sensorSizes, 4);
-
 	resultMetadata->addEntry(ANDROID_SENSOR_TIMESTAMP, &timestamp, 1);
 
 	/* 33.3 msec */
@@ -1903,6 +1925,15 @@ CameraDevice::getResultMetadata(Camera3RequestDescriptor *descriptor,
 					 &exposure, 1);
 	}
 
+	if (metadata.contains(controls::ScalerCrop)) {
+		Rectangle crop = metadata.get(controls::ScalerCrop);
+		int32_t cropRect[] = {
+			crop.x, crop.y, static_cast<int32_t>(crop.width),
+			static_cast<int32_t>(crop.height),
+		};
+		resultMetadata->addEntry(ANDROID_SCALER_CROP_REGION, cropRect, 4);
+	}
+
 	/*
 	 * Return the result metadata pack even is not valid: get() will return
 	 * nullptr.

src/android/camera_device.h

@@ -104,6 +104,7 @@ private:
 	void notifyError(uint32_t frameNumber, camera3_stream_t *stream);
 	CameraMetadata *requestTemplatePreview();
 	libcamera::PixelFormat toPixelFormat(int format) const;
+	int processControls(Camera3RequestDescriptor *descriptor);
 	std::unique_ptr<CameraMetadata> getResultMetadata(
 		Camera3RequestDescriptor *descriptor, int64_t timestamp);
 

src/android/camera_worker.h

@@ -25,6 +25,7 @@ public:
 	CaptureRequest(libcamera::Camera *camera, uint64_t cookie);
 
 	const std::vector<int> &fences() const { return acquireFences_; }
+	libcamera::ControlList &controls() { return request_->controls(); }
 	const libcamera::ControlList &metadata() const
 	{
 		return request_->metadata();