Cancel authentication when secure camera is launched on Keyguard

To decrease potential latency in starting the secure camera, rather than
waiting for keyguard to become occluded and canceling authentication, we
pre-emptively cancel face auth on keyguard when double tap is activated.
This saves hundreds of ms.

Fixes: 134613755

Test: With added logging, observed that cancel is now invoked immediately
      when double tap for camera is triggered.

Change-Id: I3740c55fb608cd1f8aa228768389f192cf18d557

packages/SystemUI/src/com/android/keyguard/KeyguardUpdateMonitor.java

@@ -212,6 +212,7 @@ public class KeyguardUpdateMonitor implements TrustManager.TrustListener {
     private boolean mHasLockscreenWallpaper;
     private boolean mAssistantVisible;
     private boolean mKeyguardOccluded;
+    private boolean mSecureCameraLaunched;
     @VisibleForTesting
     protected boolean mTelephonyCapable;
 
@@ -522,6 +523,14 @@ public class KeyguardUpdateMonitor implements TrustManager.TrustListener {
         updateBiometricListeningState();
     }
 
+    /**
+     * Invoked when the secure camera is launched.
+     */
+    public void onCameraLaunched() {
+        mSecureCameraLaunched = true;
+        updateBiometricListeningState();
+    }
+
     /**
      * @return a cached version of DreamManager.isDreaming()
      */
@@ -1654,7 +1663,8 @@ public class KeyguardUpdateMonitor implements TrustManager.TrustListener {
         return (mBouncer || mAuthInterruptActive || awakeKeyguard || shouldListenForFaceAssistant())
                 && !mSwitchingUser && !getUserCanSkipBouncer(user) && !isFaceDisabled(user)
                 && !mKeyguardGoingAway && mFaceSettingEnabledForUser && !mLockIconPressed
-                && mUserManager.isUserUnlocked(user) && mIsPrimaryUser;
+                && mUserManager.isUserUnlocked(user) && mIsPrimaryUser
+                && !mSecureCameraLaunched;
     }
 
     /**
@@ -2102,6 +2112,11 @@ public class KeyguardUpdateMonitor implements TrustManager.TrustListener {
         checkIsHandlerThread();
         Log.d(TAG, "onKeyguardVisibilityChanged(" + showing + ")");
         mKeyguardIsVisible = showing;
+
+        if (showing) {
+            mSecureCameraLaunched = false;
+        }
+
         for (int i = 0; i < mCallbacks.size(); i++) {
             KeyguardUpdateMonitorCallback cb = mCallbacks.get(i).get();
             if (cb != null) {

packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

@@ -3770,6 +3770,12 @@ public class StatusBar extends SystemUI implements DemoMode,
                     "com.android.systemui:CAMERA_GESTURE");
         }
         vibrateForCameraGesture();
+
+        if (source == StatusBarManager.CAMERA_LAUNCH_SOURCE_POWER_DOUBLE_TAP) {
+            Log.v(TAG, "Camera launch");
+            mKeyguardUpdateMonitor.onCameraLaunched();
+        }
+
         if (!mStatusBarKeyguardViewManager.isShowing()) {
             startActivityDismissingKeyguard(KeyguardBottomAreaView.INSECURE_CAMERA_INTENT,
                     false /* onlyProvisioned */, true /* dismissShade */,