Metirc largest view percentage each inflate frame

Bug: 301343249
Test: record_android_trace view -a*
Flag: ACONFIG android.view.flags.Flags.toolkitMetrics DEVELOPMENT
Change-Id: Icd80c9e8790a49d8efa7a4596cc2858222385618

2 files changed, 26 insertions, 5 deletions

diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index e4b709e66fbc..ec994590e339 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -32,6 +32,7 @@ import static android.view.displayhash.DisplayHashResultCallback.EXTRA_DISPLAY_H
 import static android.view.displayhash.DisplayHashResultCallback.EXTRA_DISPLAY_HASH_ERROR_CODE;
 import static android.view.flags.Flags.FLAG_TOOLKIT_SET_FRAME_RATE_READ_ONLY;
 import static android.view.flags.Flags.FLAG_VIEW_VELOCITY_API;
+import static android.view.flags.Flags.toolkitMetricsForFrameRateDecision;
 import static android.view.flags.Flags.toolkitSetFrameRateReadOnly;
 import static android.view.flags.Flags.viewVelocityApi;
 import static android.view.inputmethod.Flags.FLAG_HOME_SCREEN_HANDWRITING_DELEGATOR;
@@ -2309,6 +2310,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
     protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
 
     private static boolean sToolkitSetFrameRateReadOnlyFlagValue;
+    private static boolean sToolkitMetricsForFrameRateDecisionFlagValue;
 
     static {
         EMPTY_STATE_SET = StateSet.get(0);
@@ -2393,6 +2395,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
                         | StateSet.VIEW_STATE_PRESSED);
 
         sToolkitSetFrameRateReadOnlyFlagValue = toolkitSetFrameRateReadOnly();
+        sToolkitMetricsForFrameRateDecisionFlagValue = toolkitMetricsForFrameRateDecision();
     }
 
     /**
@@ -33084,11 +33087,11 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
 
     private void votePreferredFrameRate() {
         // use toolkitSetFrameRate flag to gate the change
-        if (sToolkitSetFrameRateReadOnlyFlagValue) {
-            ViewRootImpl viewRootImpl = getViewRootImpl();
-            float sizePercentage = getSizePercentage();
-            int frameRateCateogry = calculateFrameRateCategory(sizePercentage);
-            if (viewRootImpl != null && sizePercentage > 0) {
+        ViewRootImpl viewRootImpl = getViewRootImpl();
+        float sizePercentage = getSizePercentage();
+        int frameRateCateogry = calculateFrameRateCategory(sizePercentage);
+        if (viewRootImpl != null && sizePercentage > 0) {
+            if (sToolkitSetFrameRateReadOnlyFlagValue) {
                 if (mPreferredFrameRate < 0) {
                     if (mPreferredFrameRate == REQUESTED_FRAME_RATE_CATEGORY_NO_PREFERENCE) {
                         frameRateCateogry = FRAME_RATE_CATEGORY_NO_PREFERENCE;
@@ -33104,6 +33107,9 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
                 }
                 viewRootImpl.votePreferredFrameRateCategory(frameRateCateogry);
             }
+            if (sToolkitMetricsForFrameRateDecisionFlagValue) {
+                viewRootImpl.recordViewPercentage(sizePercentage);
+            }
         }
     }
 
diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index 185328277dfd..487b15c03292 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -827,6 +827,8 @@ public final class ViewRootImpl implements ViewParent,
     private boolean mInsetsAnimationRunning;
 
     private long mPreviousFrameDrawnTime = -1;
+    // The largest view size percentage to the display size. Used on trace to collect metric.
+    private float mLargestChildPercentage = 0.0f;
 
     /**
      * The resolved pointer icon type requested by this window.
@@ -1066,6 +1068,7 @@ public final class ViewRootImpl implements ViewParent,
 
     private String mTag = TAG;
     private String mFpsTraceName;
+    private String mLargestViewTraceName;
 
     private static boolean sToolkitSetFrameRateReadOnlyFlagValue;
     private static boolean sToolkitMetricsForFrameRateDecisionFlagValue;
@@ -1317,6 +1320,7 @@ public final class ViewRootImpl implements ViewParent,
                 attrs = mWindowAttributes;
                 setTag();
                 mFpsTraceName = "FPS of " + getTitle();
+                mLargestViewTraceName = "Largest view percentage(per hundred) of " + getTitle();
 
                 if (DEBUG_KEEP_SCREEN_ON && (mClientWindowLayoutFlags
                         & WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON) != 0
@@ -4738,6 +4742,10 @@ public final class ViewRootImpl implements ViewParent,
         long fps = NANOS_PER_SEC / timeDiff;
         Trace.setCounter(mFpsTraceName, fps);
         mPreviousFrameDrawnTime = expectedDrawnTime;
+
+        long percentage = (long) (mLargestChildPercentage * 100);
+        Trace.setCounter(mLargestViewTraceName, percentage);
+        mLargestChildPercentage = 0.0f;
     }
 
     private void reportDrawFinished(@Nullable Transaction t, int seqId) {
@@ -5058,6 +5066,7 @@ public final class ViewRootImpl implements ViewParent,
         if (DEBUG_FPS) {
             trackFPS();
         }
+
         if (sToolkitMetricsForFrameRateDecisionFlagValue) {
             collectFrameRateDecisionMetrics();
         }
@@ -12261,4 +12270,10 @@ public final class ViewRootImpl implements ViewParent,
     void setBackKeyCallbackForWindowlessWindow(@NonNull Predicate<KeyEvent> callback) {
         mWindowlessBackKeyCallback = callback;
     }
+
+    void recordViewPercentage(float percentage) {
+        if (!Trace.isEnabled()) return;
+        // Record the largest view of percentage to the display size.
+        mLargestChildPercentage = Math.max(percentage, mLargestChildPercentage);
+    }
 }