Update clock burn-in so it doesn't clash with udpfs

* update the UDFPS icon burn-in parameters to be in pixels
because we don't want display density to increase the
position movement
* when the clock is centered aligned, we want to make sure
it doesn't overlap with the udfps icon

Test: atest SystemUITests, manually update clock times with
with DozeUi.BURN_IN_TESTING_ENABLED enabled and see clock
doesn't interfere with the UDFPS icon.
Fixes: 192423460

Change-Id: I6f95fe3ad763971b804129b517f4c98192ab3674

packages/SystemUI/res/values-h800dp/dimens.xml

@@ -16,7 +16,7 @@
 
 <resources>
     <!-- Minimum margin between clock and top of screen or ambient indication -->
-    <dimen name="keyguard_clock_top_margin">76dp</dimen>
+    <dimen name="keyguard_clock_top_margin">38dp</dimen>
 
     <!-- Large clock maximum font size (dp is intentional, to prevent any further scaling) -->
     <dimen name="large_clock_text_size">200dp</dimen>

packages/SystemUI/res/values/dimens.xml

@@ -750,9 +750,7 @@
     <!-- The margin between the status view and the notifications on Keyguard.-->
     <dimen name="keyguard_status_view_bottom_margin">20dp</dimen>
     <!-- Minimum margin between clock and status bar -->
-    <dimen name="keyguard_clock_top_margin">36dp</dimen>
+    <dimen name="keyguard_clock_top_margin">18dp</dimen>
-    <!-- The margin between top of clock and bottom of lock icon. -->
-    <dimen name="keyguard_clock_lock_margin">16dp</dimen>
     <!-- The amount to shift the clocks during a small/large transition -->
     <dimen name="keyguard_clock_switch_y_shift">10dp</dimen>
     <!-- When large clock is showing, offset the smartspace by this amount -->
@@ -1157,9 +1155,9 @@
     <dimen name="default_burn_in_prevention_offset">15dp</dimen>
 
     <!-- The maximum offset for the under-display fingerprint sensor (UDFPS) icon in either
-         direction that elements aer moved to prevent burn-in on AOD-->
+         direction that elements are moved to prevent burn-in on AOD-->
-    <dimen name="udfps_burn_in_offset_x">2dp</dimen>
+    <dimen name="udfps_burn_in_offset_x">7px</dimen>
-    <dimen name="udfps_burn_in_offset_y">8dp</dimen>
+    <dimen name="udfps_burn_in_offset_y">28px</dimen>
 
     <dimen name="corner_size">8dp</dimen>
     <dimen name="top_padding">0dp</dimen>

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

@@ -72,13 +72,16 @@ public class KeyguardClockSwitchController extends ViewController<KeyguardClockS
      * Clock for both small and large sizes
      */
     private AnimatableClockController mClockViewController;
-    private FrameLayout mClockFrame;
+    private FrameLayout mClockFrame; // top aligned clock
     private AnimatableClockController mLargeClockViewController;
-    private FrameLayout mLargeClockFrame;
+    private FrameLayout mLargeClockFrame; // centered clock
 
     private final KeyguardUpdateMonitor mKeyguardUpdateMonitor;
     private final KeyguardBypassController mBypassController;
 
+    private int mLargeClockTopMargin = 0;
+    private int mKeyguardClockTopMargin = 0;
+
     /**
      * Listener for changes to the color palette.
      *
@@ -177,6 +180,8 @@ public class KeyguardClockSwitchController extends ViewController<KeyguardClockS
         }
         mColorExtractor.addOnColorsChangedListener(mColorsListener);
         mView.updateColors(getGradientColors());
+        mKeyguardClockTopMargin =
+                mView.getResources().getDimensionPixelSize(R.dimen.keyguard_clock_top_margin);
 
         if (mOnlyClock) {
             View ksa = mView.findViewById(R.id.keyguard_status_area);
@@ -241,6 +246,8 @@ public class KeyguardClockSwitchController extends ViewController<KeyguardClockS
      */
     public void onDensityOrFontScaleChanged() {
         mView.onDensityOrFontScaleChanged();
+        mKeyguardClockTopMargin =
+                mView.getResources().getDimensionPixelSize(R.dimen.keyguard_clock_top_margin);
 
         updateClockLayout();
     }
@@ -249,9 +256,12 @@ public class KeyguardClockSwitchController extends ViewController<KeyguardClockS
         if (mSmartspaceController.isEnabled()) {
             RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(MATCH_PARENT,
                     MATCH_PARENT);
-            lp.topMargin = getContext().getResources().getDimensionPixelSize(
+            mLargeClockTopMargin = getContext().getResources().getDimensionPixelSize(
                     R.dimen.keyguard_large_clock_top_margin);
+            lp.topMargin = mLargeClockTopMargin;
             mLargeClockFrame.setLayoutParams(lp);
+        } else {
+            mLargeClockTopMargin = 0;
         }
     }
 
@@ -363,6 +373,28 @@ public class KeyguardClockSwitchController extends ViewController<KeyguardClockS
         }
     }
 
+    /**
+     * Get y-bottom position of the currently visible clock on the keyguard.
+     * We can't directly getBottom() because clock changes positions in AOD for burn-in
+     */
+    int getClockBottom(int statusBarHeaderHeight) {
+        if (mLargeClockFrame.getVisibility() == View.VISIBLE) {
+            View clock = mLargeClockFrame.findViewById(
+                    com.android.systemui.R.id.animatable_clock_view_large);
+            int frameHeight = mLargeClockFrame.getHeight();
+            int clockHeight = clock.getHeight();
+            return frameHeight / 2 + clockHeight / 2;
+        } else {
+            return mClockFrame.findViewById(
+                    com.android.systemui.R.id.animatable_clock_view).getHeight()
+                    + statusBarHeaderHeight + mKeyguardClockTopMargin;
+        }
+    }
+
+    boolean isClockTopAligned() {
+        return mLargeClockFrame.getVisibility() != View.VISIBLE;
+    }
+
     private void updateAodIcons() {
         NotificationIconContainer nic = (NotificationIconContainer)
                 mView.findViewById(

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

@@ -186,6 +186,20 @@ public class KeyguardStatusViewController extends ViewController<KeyguardStatusV
         return mView.getHeight() - mKeyguardClockSwitchController.getNotificationIconAreaHeight();
     }
 
+    /**
+     * Get y-bottom position of the currently visible clock.
+     */
+    public int getClockBottom(int statusBarHeaderHeight) {
+        return mKeyguardClockSwitchController.getClockBottom(statusBarHeaderHeight);
+    }
+
+    /**
+     * @return true if the currently displayed clock is top aligned (as opposed to center aligned)
+     */
+    public boolean isClockTopAligned() {
+        return mKeyguardClockSwitchController.isClockTopAligned();
+    }
+
     /**
      * Set whether the view accessibility importance mode.
      */

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

@@ -56,6 +56,21 @@ public class KeyguardClockPositionAlgorithm {
      */
     private int mUserSwitchPreferredY;
 
+    /**
+     * Whether or not there is a custom clock face on keyguard.
+     */
+    private boolean mHasCustomClock;
+
+    /**
+     * Whether or not the NSSL contains any visible notifications.
+     */
+    private boolean mHasVisibleNotifs;
+
+    /**
+     * Height of notification stack: Sum of height of each notification.
+     */
+    private int mNotificationStackHeight;
+
     /**
      * Minimum top margin to avoid overlap with status bar, lock icon, or multi-user switcher
      * avatar.
@@ -112,6 +127,25 @@ public class KeyguardClockPositionAlgorithm {
 
     private boolean mIsSplitShade;
 
+    /**
+     * Top location of the udfps icon. This includes the worst case (highest) burn-in
+     * offset that would make the top physically highest on the screen.
+     *
+     * Set to -1 if udfps is not enrolled on the device.
+     */
+    private float mUdfpsTop;
+
+    /**
+     * Bottom y-position of the currently visible clock
+     */
+    private float mClockBottom;
+
+    /**
+     * If true, try to keep clock aligned to the top of the display. Else, assume the clock
+     * is center aligned.
+     */
+    private boolean mIsClockTopAligned;
+
     /**
      * Refreshes the dimension values.
      */
@@ -120,7 +154,7 @@ public class KeyguardClockPositionAlgorithm {
                 R.dimen.keyguard_status_view_bottom_margin);
 
         mContainerTopPadding =
-                res.getDimensionPixelSize(R.dimen.keyguard_clock_top_margin) / 2;
+                res.getDimensionPixelSize(R.dimen.keyguard_clock_top_margin);
         mBurnInPreventionOffsetX = res.getDimensionPixelSize(
                 R.dimen.burn_in_prevention_offset_x);
         mBurnInPreventionOffsetYClock = res.getDimensionPixelSize(
@@ -134,7 +168,7 @@ public class KeyguardClockPositionAlgorithm {
             int keyguardStatusHeight, int userSwitchHeight, int userSwitchPreferredY,
             float dark, float overStretchAmount, boolean bypassEnabled,
             int unlockedStackScrollerPadding, float qsExpansion, int cutoutTopInset,
-            boolean isSplitShade) {
+            boolean isSplitShade, float udfpsTop, float clockBottom, boolean isClockTopAligned) {
         mMinTopMargin = keyguardStatusBarHeaderHeight + Math.max(mContainerTopPadding,
                 userSwitchHeight);
         mPanelExpansion = panelExpansion;
@@ -148,6 +182,9 @@ public class KeyguardClockPositionAlgorithm {
         mQsExpansion = qsExpansion;
         mCutoutTopInset = cutoutTopInset;
         mIsSplitShade = isSplitShade;
+        mUdfpsTop = udfpsTop;
+        mClockBottom = clockBottom;
+        mIsClockTopAligned = isClockTopAligned;
     }
 
     public void run(Result result) {
@@ -202,8 +239,34 @@ public class KeyguardClockPositionAlgorithm {
         if (clockY - mBurnInPreventionOffsetYClock < mCutoutTopInset) {
             shift = mCutoutTopInset - (clockY - mBurnInPreventionOffsetYClock);
         }
-        float clockYDark = clockY + burnInPreventionOffsetY() + shift;
 
+        int burnInPreventionOffsetY = mBurnInPreventionOffsetYClock; // requested offset
+        final boolean hasUdfps = mUdfpsTop > -1;
+        if (hasUdfps && !mIsClockTopAligned) {
+            // ensure clock doesn't overlap with the udfps icon
+            if (mUdfpsTop < mClockBottom) {
+                // sometimes the clock textView extends beyond udfps, so let's just use the
+                // space above the KeyguardStatusView/clock as our burn-in offset
+                burnInPreventionOffsetY = (int) (clockY - mCutoutTopInset) / 2;
+                if (mBurnInPreventionOffsetYClock < burnInPreventionOffsetY) {
+                    burnInPreventionOffsetY = mBurnInPreventionOffsetYClock;
+                }
+                shift = -burnInPreventionOffsetY;
+            } else {
+                float upperSpace = clockY - mCutoutTopInset;
+                float lowerSpace = mUdfpsTop - mClockBottom;
+                // center the burn-in offset within the upper + lower space
+                burnInPreventionOffsetY = (int) (lowerSpace + upperSpace) / 2;
+                if (mBurnInPreventionOffsetYClock < burnInPreventionOffsetY) {
+                    burnInPreventionOffsetY = mBurnInPreventionOffsetYClock;
+                }
+                shift = (lowerSpace - upperSpace) / 2;
+            }
+        }
+
+        float clockYDark = clockY
+                + burnInPreventionOffsetY(burnInPreventionOffsetY)
+                + shift;
         return (int) (MathUtils.lerp(clockY, clockYDark, darkAmount) + mOverStretchAmount);
     }
 
@@ -235,9 +298,7 @@ public class KeyguardClockPositionAlgorithm {
         return MathUtils.lerp(alphaKeyguard, 1f, mDarkAmount);
     }
 
-    private float burnInPreventionOffsetY() {
+    private float burnInPreventionOffsetY(int offset) {
-        int offset = mBurnInPreventionOffsetYClock;
-
         return getBurnInOffset(offset * 2, false /* xAxis */) - offset;
     }
 

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

@@ -57,6 +57,9 @@ import android.graphics.PointF;
 import android.graphics.Rect;
 import android.graphics.Region;
 import android.graphics.drawable.Drawable;
+import android.hardware.biometrics.BiometricSourceType;
+import android.hardware.biometrics.SensorLocationInternal;
+import android.hardware.fingerprint.FingerprintSensorPropertiesInternal;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.PowerManager;
@@ -568,6 +571,8 @@ public class NotificationPanelViewController extends PanelViewController {
      */
     private float mKeyguardOnlyContentAlpha = 1.0f;
 
+    private float mUdfpsMaxYBurnInOffset;
+
     /**
      * Are we currently in gesture navigation
      */
@@ -907,6 +912,7 @@ public class NotificationPanelViewController extends PanelViewController {
                 mView.getContext());
         mLockscreenNotificationQSPadding = mResources.getDimensionPixelSize(
                 R.dimen.notification_side_paddings);
+        mUdfpsMaxYBurnInOffset = mResources.getDimensionPixelSize(R.dimen.udfps_burn_in_offset_y);
     }
 
     private void updateViewControllers(KeyguardStatusView keyguardStatusView,
@@ -1265,7 +1271,17 @@ public class NotificationPanelViewController extends PanelViewController {
         float darkamount =
                 mUnlockedScreenOffAnimationController.isScreenOffAnimationPlaying()
                         ? 1.0f : mInterpolatedDarkAmount;
-        mClockPositionAlgorithm.setup(mStatusBarHeaderHeightKeyguard,
+
+        float udfpsAodTopLocation = -1f;
+        if (mUpdateMonitor.isUdfpsEnrolled() && mAuthController.getUdfpsProps().size() > 0) {
+            FingerprintSensorPropertiesInternal props = mAuthController.getUdfpsProps().get(0);
+            final SensorLocationInternal location = props.getLocation();
+            udfpsAodTopLocation = location.sensorLocationY - location.sensorRadius
+                    - mUdfpsMaxYBurnInOffset;
+        }
+
+        mClockPositionAlgorithm.setup(
+                mStatusBarHeaderHeightKeyguard,
                 expandedFraction,
                 mKeyguardStatusViewController.getLockscreenHeight(),
                 userIconHeight,
@@ -1274,7 +1290,10 @@ public class NotificationPanelViewController extends PanelViewController {
                 bypassEnabled, getUnlockedStackScrollerPadding(),
                 computeQsExpansionFraction(),
                 mDisplayTopInset,
-                mShouldUseSplitNotificationShade);
+                mShouldUseSplitNotificationShade,
+                udfpsAodTopLocation,
+                mKeyguardStatusViewController.getClockBottom(mStatusBarHeaderHeightKeyguard),
+                mKeyguardStatusViewController.isClockTopAligned());
         mClockPositionAlgorithm.run(mClockPositionResult);
         boolean animate = mNotificationStackScrollLayoutController.isAddOrRemoveAnimationPending();
         boolean animateClock = animate || mAnimateNextPositionUpdate;

packages/SystemUI/tests/src/com/android/keyguard/KeyguardClockSwitchControllerTest.java

@@ -119,6 +119,7 @@ public class KeyguardClockSwitchControllerTest extends SysuiTestCase {
         when(mNotificationIcons.getLayoutParams()).thenReturn(
                 mock(RelativeLayout.LayoutParams.class));
         when(mView.getContext()).thenReturn(getContext());
+        when(mView.getResources()).thenReturn(mResources);
 
         when(mView.findViewById(R.id.animatable_clock_view)).thenReturn(mClockView);
         when(mView.findViewById(R.id.animatable_clock_view_large)).thenReturn(mLargeClockView);
@@ -127,7 +128,6 @@ public class KeyguardClockSwitchControllerTest extends SysuiTestCase {
         when(mLargeClockView.getContext()).thenReturn(getContext());
 
         when(mView.isAttachedToWindow()).thenReturn(true);
-        when(mResources.getString(anyInt())).thenReturn("h:mm");
         when(mSmartspaceController.buildAndConnectView(any())).thenReturn(mFakeSmartspaceView);
         mController = new KeyguardClockSwitchController(
                 mView,

packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/KeyguardClockPositionAlgorithmTest.java

@@ -16,42 +16,80 @@
 
 package com.android.systemui.statusbar.phone;
 
+import static com.android.dx.mockito.inline.extended.ExtendedMockito.mockitoSession;
+
 import static com.google.common.truth.Truth.assertThat;
 
+import static org.mockito.AdditionalAnswers.returnsFirstArg;
+import static org.mockito.ArgumentMatchers.anyBoolean;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.when;
+
+import android.content.res.Resources;
 import android.testing.AndroidTestingRunner;
 
 import androidx.test.filters.SmallTest;
 
+import com.android.systemui.R;
 import com.android.systemui.SysuiTestCase;
+import com.android.systemui.doze.util.BurnInHelperKt;
 
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.mockito.MockitoSession;
 
 @SmallTest
 @RunWith(AndroidTestingRunner.class)
 public class KeyguardClockPositionAlgorithmTest extends SysuiTestCase {
     private static final int SCREEN_HEIGHT = 2000;
-    private static final int EMPTY_MARGIN = 0;
     private static final int EMPTY_HEIGHT = 0;
     private static final float ZERO_DRAG = 0.f;
     private static final float OPAQUE = 1.f;
     private static final float TRANSPARENT = 0.f;
+
+    @Mock
+    private Resources mResources;
+
     private KeyguardClockPositionAlgorithm mClockPositionAlgorithm;
     private KeyguardClockPositionAlgorithm.Result mClockPosition;
+
+    private MockitoSession mStaticMockSession;
+    private int mNotificationStackHeight;
+
     private float mPanelExpansion;
+    private int mKeyguardStatusBarHeaderHeight;
     private int mKeyguardStatusHeight;
     private float mDark;
     private float mQsExpansion;
-    private int mCutoutTopInsetPx = 0;
+    private int mCutoutTopInset = 0;
     private boolean mIsSplitShade = false;
+    private float mUdfpsTop = -1;
+    private float mClockBottom = SCREEN_HEIGHT / 2;
+    private boolean mClockTopAligned;
 
     @Before
     public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mStaticMockSession = mockitoSession()
+                .mockStatic(BurnInHelperKt.class)
+                .startMocking();
+
         mClockPositionAlgorithm = new KeyguardClockPositionAlgorithm();
+        when(mResources.getDimensionPixelSize(anyInt())).thenReturn(0);
+        mClockPositionAlgorithm.loadDimens(mResources);
+
         mClockPosition = new KeyguardClockPositionAlgorithm.Result();
     }
 
+    @After
+    public void tearDown() {
+        mStaticMockSession.finishMocking();
+    }
+
     @Test
     public void clockPositionTopOfScreenOnAOD() {
         // GIVEN on AOD and clock has 0 height
@@ -71,7 +109,7 @@ public class KeyguardClockPositionAlgorithmTest extends SysuiTestCase {
         // GIVEN on AOD and clock has 0 height
         givenAOD();
         mKeyguardStatusHeight = EMPTY_HEIGHT;
-        mCutoutTopInsetPx = 300;
+        mCutoutTopInset = 300;
         // WHEN the clock position algorithm is run
         positionClock();
         // THEN the clock Y position is below the cutout
@@ -271,6 +309,155 @@ public class KeyguardClockPositionAlgorithmTest extends SysuiTestCase {
         assertThat(mClockPosition.clockAlpha).isEqualTo(TRANSPARENT);
     }
 
+    @Test
+    public void clockPositionMinimizesBurnInMovementToAvoidUdfpsOnAOD() {
+        // GIVEN a center aligned clock
+        mClockTopAligned = false;
+
+        // GIVEN the clock + udfps are 100px apart
+        mClockBottom = SCREEN_HEIGHT - 500;
+        mUdfpsTop = SCREEN_HEIGHT - 400;
+
+        // GIVEN it's AOD and the burn-in y value is 200
+        givenAOD();
+        givenMaxBurnInOffset(200);
+
+        // WHEN the clock position algorithm is run with the highest burn in offset
+        givenHighestBurnInOffset();
+        positionClock();
+
+        // THEN the worst-case clock Y position is shifted only by 100 (not the full 200),
+        // so that it's at the same location as mUdfpsTop
+        assertThat(mClockPosition.clockY).isEqualTo(100);
+
+        // WHEN the clock position algorithm is run with the lowest burn in offset
+        givenLowestBurnInOffset();
+        positionClock();
+
+        // THEN lowest case starts at 0
+        assertThat(mClockPosition.clockY).isEqualTo(0);
+    }
+
+    @Test
+    public void clockPositionShiftsToAvoidUdfpsOnAOD_usesSpaceAboveClock() {
+        // GIVEN a center aligned clock
+        mClockTopAligned = false;
+
+        // GIVEN there's space at the top of the screen on LS (that's available to be used for
+        // burn-in on AOD)
+        mKeyguardStatusBarHeaderHeight = 150;
+
+        // GIVEN the bottom of the clock is beyond the top of UDFPS
+        mClockBottom = SCREEN_HEIGHT - 300;
+        mUdfpsTop = SCREEN_HEIGHT - 400;
+
+        // GIVEN it's AOD and the burn-in y value is 200
+        givenAOD();
+        givenMaxBurnInOffset(200);
+
+        // WHEN the clock position algorithm is run with the highest burn in offset
+        givenHighestBurnInOffset();
+        positionClock();
+
+        // THEN the algo should shift the clock up and use the area above the clock for
+        // burn-in since the burn in offset > space above clock
+        assertThat(mClockPosition.clockY).isEqualTo(mKeyguardStatusBarHeaderHeight);
+
+        // WHEN the clock position algorithm is run with the lowest burn in offset
+        givenLowestBurnInOffset();
+        positionClock();
+
+        // THEN lowest case starts at mCutoutTopInset (0 in this case)
+        assertThat(mClockPosition.clockY).isEqualTo(mCutoutTopInset);
+    }
+
+    @Test
+    public void clockPositionShiftsToAvoidUdfpsOnAOD_usesMaxBurnInOffset() {
+        // GIVEN a center aligned clock
+        mClockTopAligned = false;
+
+        // GIVEN there's 200px space at the top of the screen on LS (that's available to be used for
+        // burn-in on AOD) but 50px are taken up by the cutout
+        mKeyguardStatusBarHeaderHeight = 200;
+        mCutoutTopInset = 50;
+
+        // GIVEN the bottom of the clock is beyond the top of UDFPS
+        mClockBottom = SCREEN_HEIGHT - 300;
+        mUdfpsTop = SCREEN_HEIGHT - 400;
+
+        // GIVEN it's AOD and the burn-in y value is only 25px (less than space above clock)
+        givenAOD();
+        int maxYBurnInOffset = 25;
+        givenMaxBurnInOffset(maxYBurnInOffset);
+
+        // WHEN the clock position algorithm is run with the highest burn in offset
+        givenHighestBurnInOffset();
+        positionClock();
+
+        // THEN the algo should shift the clock up and use the area above the clock for
+        // burn-in
+        assertThat(mClockPosition.clockY).isEqualTo(mKeyguardStatusBarHeaderHeight);
+
+        // WHEN the clock position algorithm is run with the lowest burn in offset
+        givenLowestBurnInOffset();
+        positionClock();
+
+        // THEN lowest case starts above mKeyguardStatusBarHeaderHeight
+        assertThat(mClockPosition.clockY).isEqualTo(
+                mKeyguardStatusBarHeaderHeight - 2 * maxYBurnInOffset);
+    }
+
+    @Test
+    public void clockPositionShiftsToMaximizeUdfpsBurnInMovement() {
+        // GIVEN a center aligned clock
+        mClockTopAligned = false;
+
+        // GIVEN there's 200px space at the top of the screen on LS (that's available to be used for
+        // burn-in on AOD) but 50px are taken up by the cutout
+        mKeyguardStatusBarHeaderHeight = 200;
+        mCutoutTopInset = 50;
+        int upperSpaceAvailable = mKeyguardStatusBarHeaderHeight - mCutoutTopInset;
+
+        // GIVEN the bottom of the clock and the top of UDFPS are 100px apart
+        mClockBottom = SCREEN_HEIGHT - 500;
+        mUdfpsTop = SCREEN_HEIGHT - 400;
+        float lowerSpaceAvailable = mUdfpsTop - mClockBottom;
+
+        // GIVEN it's AOD and the burn-in y value is 200
+        givenAOD();
+        givenMaxBurnInOffset(200);
+
+        // WHEN the clock position algorithm is run with the highest burn in offset
+        givenHighestBurnInOffset();
+        positionClock();
+
+        // THEN the algo should shift the clock up and use both the area above
+        // the clock and below the clock (vertically centered in its allowed area)
+        assertThat(mClockPosition.clockY).isEqualTo(
+                (int) (mCutoutTopInset + upperSpaceAvailable + lowerSpaceAvailable));
+
+        // WHEN the clock position algorithm is run with the lowest burn in offset
+        givenLowestBurnInOffset();
+        positionClock();
+
+        // THEN lowest case starts at mCutoutTopInset
+        assertThat(mClockPosition.clockY).isEqualTo(mCutoutTopInset);
+    }
+
+    private void givenHighestBurnInOffset() {
+        when(BurnInHelperKt.getBurnInOffset(anyInt(), anyBoolean())).then(returnsFirstArg());
+    }
+
+    private void givenLowestBurnInOffset() {
+        when(BurnInHelperKt.getBurnInOffset(anyInt(), anyBoolean())).thenReturn(0);
+    }
+
+    private void givenMaxBurnInOffset(int offset) {
+        when(mResources.getDimensionPixelSize(R.dimen.burn_in_prevention_offset_y_clock))
+                .thenReturn(offset);
+        mClockPositionAlgorithm.loadDimens(mResources);
+    }
+
     private void givenAOD() {
         mPanelExpansion = 1.f;
         mDark = 1.f;
@@ -281,12 +468,28 @@ public class KeyguardClockPositionAlgorithmTest extends SysuiTestCase {
         mDark = 0.f;
     }
 
+    /**
+     * Setup and run the clock position algorithm.
+     *
+     * mClockPosition.clockY will contain the top y-coordinate for the clock position
+     */
     private void positionClock() {
-        mClockPositionAlgorithm.setup(EMPTY_MARGIN, mPanelExpansion, mKeyguardStatusHeight,
+        mClockPositionAlgorithm.setup(
-                0 /* userSwitchHeight */, 0 /* userSwitchPreferredY */,
+                mKeyguardStatusBarHeaderHeight,
-                mDark, ZERO_DRAG, false /* bypassEnabled */,
+                mPanelExpansion,
-                0 /* unlockedStackScrollerPadding */, mQsExpansion,
+                mKeyguardStatusHeight,
-                mCutoutTopInsetPx, mIsSplitShade);
+                0 /* userSwitchHeight */,
+                0 /* userSwitchPreferredY */,
+                mDark,
+                ZERO_DRAG,
+                false /* bypassEnabled */,
+                0 /* unlockedStackScrollerPadding */,
+                mQsExpansion,
+                mCutoutTopInset,
+                mIsSplitShade,
+                mUdfpsTop,
+                mClockBottom,
+                mClockTopAligned);
         mClockPositionAlgorithm.run(mClockPosition);
     }
 }