Fix RegionSampler crashes

RegionSampler was crashing due to (1) the LS Smartspace not checking for
the View's existence in the RegionSampler map and (2) adding regions
that were out of bounds. These crashes prevented RegionSampler from
working properly (i.e. being able to edit thresholds from ag/21145349).

This change also addresses some faulty logic in ClockEventController that was causing only the large clock view to be sampled. Now, both the small clock and large clock are being sampled when there's a layout change detected.

Bug: 202758428
Flag: region_sampling
Test: manual (verified no more error logs related to RegionSampler in Logcat)
Change-Id: I7895f1c2aa8fb19feac325df71d8b7f04c39717b

packages/SystemUI/shared/src/com/android/systemui/shared/regionsampling/RegionSampler.kt

@@ -91,6 +91,22 @@ constructor(
         val sampledRegion = calculateSampledRegion(sampledView)
         val regions = ArrayList<RectF>()
         val sampledRegionWithOffset = convertBounds(sampledRegion)
+
+        if (
+            sampledRegionWithOffset.left < 0.0 ||
+                sampledRegionWithOffset.right > 1.0 ||
+                sampledRegionWithOffset.top < 0.0 ||
+                sampledRegionWithOffset.bottom > 1.0
+        ) {
+            android.util.Log.e(
+                "RegionSampler",
+                "view out of bounds: $sampledRegion | " +
+                    "screen width: ${displaySize.x}, screen height: ${displaySize.y}",
+                Exception()
+            )
+            return
+        }
+
         regions.add(sampledRegionWithOffset)
 
         wallpaperManager?.removeOnColorsChangedListener(this)

packages/SystemUI/src/com/android/keyguard/ClockEventController.kt

@@ -21,6 +21,7 @@ import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.content.res.Resources
+import android.graphics.Rect
 import android.text.format.DateFormat
 import android.util.TypedValue
 import android.view.View
@@ -119,10 +120,6 @@ constructor(
 
     private val mLayoutChangedListener =
         object : View.OnLayoutChangeListener {
-            private var currentSmallClockView: View? = null
-            private var currentLargeClockView: View? = null
-            private var currentSmallClockLocation = IntArray(2)
-            private var currentLargeClockLocation = IntArray(2)
 
             override fun onLayoutChange(
                 view: View?,
@@ -135,6 +132,8 @@ constructor(
                 oldRight: Int,
                 oldBottom: Int
             ) {
+                view?.removeOnLayoutChangeListener(this)
+
                 val parent = (view?.parent) as FrameLayout
 
                 // don't pass in negative bounds when clocks are in transition state
@@ -142,31 +141,12 @@ constructor(
                     return
                 }
 
-                // SMALL CLOCK
-                if (parent.id == R.id.lockscreen_clock_view) {
-                    // view bounds have changed due to clock size changing (i.e. different character
-                    // widths)
-                    // AND/OR the view has been translated when transitioning between small and
-                    // large clock
-                    if (
-                        view != currentSmallClockView ||
-                            !view.locationOnScreen.contentEquals(currentSmallClockLocation)
-                    ) {
-                        currentSmallClockView = view
-                        currentSmallClockLocation = view.locationOnScreen
-                        updateRegionSampler(view)
-                    }
-                }
-                // LARGE CLOCK
-                else if (parent.id == R.id.lockscreen_clock_view_large) {
-                    if (
-                        view != currentLargeClockView ||
-                            !view.locationOnScreen.contentEquals(currentLargeClockLocation)
-                    ) {
-                        currentLargeClockView = view
-                        currentLargeClockLocation = view.locationOnScreen
-                        updateRegionSampler(view)
-                    }
+                val currentViewRect = Rect(left, top, right, bottom)
+                val oldViewRect = Rect(oldLeft, oldTop, oldRight, oldBottom)
+
+                if (currentViewRect.width() != oldViewRect.width() ||
+                    currentViewRect.height() != oldViewRect.height()) {
+                    updateRegionSampler(view)
                 }
             }
         }

packages/SystemUI/src/com/android/systemui/statusbar/lockscreen/LockscreenSmartspaceController.kt

@@ -500,8 +500,10 @@ constructor(
 
     private fun updateTextColorFromRegionSampler() {
         smartspaceViews.forEach {
-            val textColor = regionSamplers.getValue(it).currentForegroundColor()
-            it.setPrimaryTextColor(textColor)
+            val textColor = regionSamplers.get(it)?.currentForegroundColor()
+            if (textColor != null) {
+                it.setPrimaryTextColor(textColor)
+            }
         }
     }