/// <summary>
/// Stops face detection.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <privilege> http://tizen.org/privilege/camera </privilege>
/// <feature> http://tizen.org/feature/camera </feature>
/// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
/// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
/// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
/// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
public void StopFaceDetection()
{
if (_faceDetectedCallback == null)
{
throw new InvalidOperationException("The face detection is not started.");
}
Native.StopFaceDetection(_handle).ThrowIfFailed("Failed to stop the face detection.");
_faceDetectedCallback = null;
}
/// <summary>
/// Starts face detection.
/// The camera must be in the <see cref="CameraState.Preview"/> state.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <privilege>
/// http://tizen.org/privilege/camera
/// </privilege>
/// <remarks>
/// This should be called after <see cref="StartPreview"/> is started.
/// The Eventhandler set using <see cref="FaceDetected"/> is invoked when the face is detected in the preview frame.
/// Internally, it starts continuously focus and focusing on the detected face.
/// </remarks>
/// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
/// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
/// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
/// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
public void StartFaceDetection()
{
ValidateState(CameraState.Preview);
_faceDetectedCallback = (IntPtr faces, int count, IntPtr userData) =>
{
var result = new List <FaceDetectionData>();
IntPtr current = faces;
for (int i = 0; i < count; i++)
{
result.Add(new FaceDetectionData(current));
current = IntPtr.Add(current, Marshal.SizeOf <Native.DetectedFaceStruct>());
}
FaceDetected?.Invoke(this, new FaceDetectedEventArgs(result));
};
CameraErrorFactory.ThrowIfError(Native.StartFaceDetection(_handle, _faceDetectedCallback, IntPtr.Zero),
"Failed to start face detection");
}