SES-1354 - Video call self viewer not mirrored (#1397)

* Fixes #874

* Removed accidentally left in line

* Fixed issue - push before cleanup

* Cleaned up

* Removed cruft

---------

Co-authored-by: = <=>
Co-authored-by: AL-Session <160798022+AL-Session@users.noreply.github.com>

app/src/main/java/org/thoughtcrime/securesms/calls/WebRtcCallActivity.kt

@@ -334,6 +334,10 @@ class WebRtcCallActivity : PassphraseRequiredActionBarActivity() {
                     if (isEnabled) {
                         viewModel.localRenderer?.let { surfaceView ->
                             surfaceView.setZOrderOnTop(true)
+
+                            // Mirror the video preview of the person making the call to prevent disorienting them
+                            surfaceView.setMirror(true)
+
                             binding.localRenderer.addView(surfaceView)
                         }
                     }

app/src/main/java/org/thoughtcrime/securesms/webrtc/CallManager.kt

@@ -408,6 +408,10 @@ class CallManager(
 
     override fun onCameraSwitchCompleted(newCameraState: CameraState) {
         localCameraState = newCameraState
+
+        // If the camera we've switched to is the front one then mirror it to match what someone
+        // would see when looking in the mirror rather than the left<-->right flipped version.
+        localRenderer?.setMirror(localCameraState.activeDirection == CameraState.Direction.FRONT)
     }
 
     fun onPreOffer(callId: UUID, recipient: Recipient, onSuccess: () -> Unit) {
@@ -639,7 +643,11 @@ class CallManager(
         peerConnection?.let { connection ->
             connection.flipCamera()
             localCameraState = connection.getCameraState()
-            localRenderer?.setMirror(localCameraState.activeDirection == CameraState.Direction.FRONT)
+
+            // Note: We cannot set the mirrored state of the localRenderer here because
+            // localCameraState.activeDirection is still PENDING (not FRONT or BACK) until the flip
+            // completes and we hit Camera.onCameraSwitchDone (followed by PeerConnectionWrapper.onCameraSwitchCompleted
+            // and CallManager.onCameraSwitchCompleted).
         }
     }
 

app/src/main/java/org/thoughtcrime/securesms/webrtc/PeerConnectionWrapper.kt

@@ -326,8 +326,6 @@ class PeerConnectionWrapper(private val context: Context,
     }
 
     override fun onCameraSwitchCompleted(newCameraState: CameraState) {
-        // mirror rotation offset
-        rotationVideoSink.mirrored = newCameraState.activeDirection == CameraState.Direction.FRONT
         cameraEventListener.onCameraSwitchCompleted(newCameraState)
     }
 

app/src/main/java/org/thoughtcrime/securesms/webrtc/video/Camera.kt

@@ -54,7 +54,7 @@ class Camera(context: Context,
             Log.w(TAG, "Tried to flip camera without capturer or less than 2 cameras")
             return
         }
-        activeDirection = PENDING
+        activeDirection = PENDING // Note: The activeDirection will be PENDING until `onCameraSwitchDone`
         capturer.switchCamera(this)
     }