Revert "Descreses the counts of windows_change_bounds events"

This reverts commit dabdcc6738d92a6e6018466f564d8305ab5f9c67.

Reason for revert: This will make ANR issue (b/221497060)

Change-Id: Ie0e47c714c7f2899abf176030e912f0362f3e427

2 files changed, 74 insertions, 279 deletions

diff --git a/services/core/java/com/android/server/wm/AccessibilityController.java b/services/core/java/com/android/server/wm/AccessibilityController.java
index 57f77d5b7b94..8f703c5c7761 100644
--- a/services/core/java/com/android/server/wm/AccessibilityController.java
+++ b/services/core/java/com/android/server/wm/AccessibilityController.java
@@ -263,8 +263,6 @@ final class AccessibilityController {
                     FLAGS_MAGNIFICATION_CALLBACK | FLAGS_WINDOWS_FOR_ACCESSIBILITY_CALLBACK,
                     "displayId=" + displayId + "; spec={" + spec + "}");
         }
-        mAccessibilityWindowsPopulator.setMagnificationSpec(displayId, spec);
-
         final DisplayMagnifier displayMagnifier = mDisplayMagnifiers.get(displayId);
         if (displayMagnifier != null) {
             displayMagnifier.setMagnificationSpec(spec);
@@ -456,6 +454,19 @@ final class AccessibilityController {
         return null;
     }
 
+    boolean getMagnificationSpecForDisplay(int displayId, MagnificationSpec outSpec) {
+        if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK)) {
+            mAccessibilityTracing.logTrace(TAG + ".getMagnificationSpecForDisplay",
+                    FLAGS_MAGNIFICATION_CALLBACK, "displayId=" + displayId);
+        }
+        final DisplayMagnifier displayMagnifier = mDisplayMagnifiers.get(displayId);
+        if (displayMagnifier == null) {
+            return false;
+        }
+
+        return displayMagnifier.getMagnificationSpec(outSpec);
+    }
+
     boolean hasCallbacks() {
         if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK
                 | FLAGS_WINDOWS_FOR_ACCESSIBILITY_CALLBACK)) {
@@ -757,6 +768,25 @@ final class AccessibilityController {
             return spec;
         }
 
+        boolean getMagnificationSpec(MagnificationSpec outSpec) {
+            if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK)) {
+                mAccessibilityTracing.logTrace(LOG_TAG + ".getMagnificationSpec",
+                        FLAGS_MAGNIFICATION_CALLBACK);
+            }
+            MagnificationSpec spec = mMagnifedViewport.getMagnificationSpec();
+            if (spec == null) {
+                return false;
+            }
+
+            outSpec.setTo(spec);
+            if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK)) {
+                mAccessibilityTracing.logTrace(LOG_TAG + ".getMagnificationSpec",
+                        FLAGS_MAGNIFICATION_CALLBACK, "outSpec={" + outSpec + "}");
+            }
+
+            return true;
+        }
+
         void getMagnificationRegion(Region outMagnificationRegion) {
             if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK)) {
                 mAccessibilityTracing.logTrace(LOG_TAG + ".getMagnificationRegion",
diff --git a/services/core/java/com/android/server/wm/AccessibilityWindowsPopulator.java b/services/core/java/com/android/server/wm/AccessibilityWindowsPopulator.java
index 43317adca04a..c0fb83ba294c 100644
--- a/services/core/java/com/android/server/wm/AccessibilityWindowsPopulator.java
+++ b/services/core/java/com/android/server/wm/AccessibilityWindowsPopulator.java
@@ -41,9 +41,7 @@ import android.window.WindowInfosListener;
 import com.android.internal.annotations.GuardedBy;
 
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 /**
  * This class is the accessibility windows population adapter.
@@ -70,24 +68,13 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
     private final SparseArray<Matrix> mMagnificationSpecInverseMatrix = new SparseArray<>();
     @GuardedBy("mLock")
     private final SparseArray<DisplayInfo> mDisplayInfos = new SparseArray<>();
-    private final SparseArray<MagnificationSpec> mCurrentMagnificationSpec = new SparseArray<>();
-    @GuardedBy("mLock")
-    private final SparseArray<MagnificationSpec> mPreviousMagnificationSpec = new SparseArray<>();
     @GuardedBy("mLock")
     private final List<InputWindowHandle> mVisibleWindows = new ArrayList<>();
     @GuardedBy("mLock")
     private boolean mWindowsNotificationEnabled = false;
-    @GuardedBy("mLock")
-    private final Map<IBinder, Matrix> mWindowsTransformMatrixMap = new HashMap<>();
     private final Object mLock = new Object();
     private final Handler mHandler;
 
-    private final Matrix mTempMatrix1 = new Matrix();
-    private final Matrix mTempMatrix2 = new Matrix();
-    private final float[] mTempFloat1 = new float[9];
-    private final float[] mTempFloat2 = new float[9];
-    private final float[] mTempFloat3 = new float[9];
-
     AccessibilityWindowsPopulator(WindowManagerService service,
             AccessibilityController accessibilityController) {
         mService = service;
@@ -145,55 +132,28 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
     @Override
     public void onWindowInfosChanged(InputWindowHandle[] windowHandles,
             DisplayInfo[] displayInfos) {
-        final List<InputWindowHandle> tempVisibleWindows = new ArrayList<>();
-
-        for (InputWindowHandle window : windowHandles) {
-            if (window.visible && window.getWindow() != null) {
-                tempVisibleWindows.add(window);
-            }
-        }
-        final HashMap<IBinder, Matrix> windowsTransformMatrixMap =
-                getWindowsTransformMatrix(tempVisibleWindows);
-
         synchronized (mLock) {
-            mWindowsTransformMatrixMap.clear();
-            mWindowsTransformMatrixMap.putAll(windowsTransformMatrixMap);
-
             mVisibleWindows.clear();
-            mVisibleWindows.addAll(tempVisibleWindows);
+            for (InputWindowHandle window : windowHandles) {
+                if (window.visible && window.getWindow() != null) {
+                    mVisibleWindows.add(window);
+                }
+            }
 
             mDisplayInfos.clear();
             for (final DisplayInfo displayInfo : displayInfos) {
                 mDisplayInfos.put(displayInfo.mDisplayId, displayInfo);
             }
 
-            if (!mHandler.hasMessages(
-                    MyHandler.MESSAGE_NOTIFY_WINDOWS_CHANGED_BY_TIMEOUT)) {
-                mHandler.sendEmptyMessageDelayed(
-                        MyHandler.MESSAGE_NOTIFY_WINDOWS_CHANGED_BY_TIMEOUT,
-                        WINDOWS_CHANGED_NOTIFICATION_MAX_DURATION_TIMES_MS);
-            }
-            populateVisibleWindowHandlesAndNotifyWindowsChangeIfNeeded();
-        }
-    }
-
-    private HashMap<IBinder, Matrix> getWindowsTransformMatrix(List<InputWindowHandle> windows) {
-        synchronized (mService.mGlobalLock) {
-            final HashMap<IBinder, Matrix> windowsTransformMatrixMap = new HashMap<>();
-
-            for (InputWindowHandle inputWindowHandle : windows) {
-                final IWindow iWindow = inputWindowHandle.getWindow();
-                final WindowState windowState = iWindow != null ? mService.mWindowMap.get(
-                        iWindow.asBinder()) : null;
-
-                if (windowState != null && windowState.shouldMagnify()) {
-                    final Matrix transformMatrix = new Matrix();
-                    windowState.getTransformationMatrix(sTempFloats, transformMatrix);
-                    windowsTransformMatrixMap.put(iWindow.asBinder(), transformMatrix);
+            if (mWindowsNotificationEnabled) {
+                if (!mHandler.hasMessages(
+                        MyHandler.MESSAGE_NOTIFY_WINDOWS_CHANGED_BY_TIMEOUT)) {
+                    mHandler.sendEmptyMessageDelayed(
+                            MyHandler.MESSAGE_NOTIFY_WINDOWS_CHANGED_BY_TIMEOUT,
+                            WINDOWS_CHANGED_NOTIFICATION_MAX_DURATION_TIMES_MS);
                 }
+                populateVisibleWindowHandlesAndNotifyWindowsChangeIfNeededLocked();
             }
-
-            return windowsTransformMatrixMap;
         }
     }
 
@@ -211,43 +171,14 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
             }
             mWindowsNotificationEnabled = register;
             if (mWindowsNotificationEnabled) {
-                populateVisibleWindowHandlesAndNotifyWindowsChangeIfNeeded();
+                populateVisibleWindowHandlesAndNotifyWindowsChangeIfNeededLocked();
             } else {
                 releaseResources();
             }
         }
     }
 
-    /**
-     * Sets the magnification spec for calculating the window bounds of all windows
-     * reported from the surface flinger in the magnifying.
-     *
-     * @param displayId The display Id.
-     * @param spec THe magnification spec.
-     */
-    public void setMagnificationSpec(int displayId, MagnificationSpec spec) {
-        synchronized (mLock) {
-            MagnificationSpec currentMagnificationSpec = mCurrentMagnificationSpec.get(displayId);
-            if (currentMagnificationSpec == null) {
-                currentMagnificationSpec = new MagnificationSpec();
-                currentMagnificationSpec.setTo(spec);
-                mCurrentMagnificationSpec.put(displayId, currentMagnificationSpec);
-
-                return;
-            }
-
-            MagnificationSpec previousMagnificationSpec = mPreviousMagnificationSpec.get(displayId);
-            if (previousMagnificationSpec == null) {
-                previousMagnificationSpec = new MagnificationSpec();
-                mPreviousMagnificationSpec.put(displayId, previousMagnificationSpec);
-            }
-            previousMagnificationSpec.setTo(currentMagnificationSpec);
-            currentMagnificationSpec.setTo(spec);
-        }
-    }
-
-    @GuardedBy("mLock")
-    private void populateVisibleWindowHandlesAndNotifyWindowsChangeIfNeeded() {
+    private void populateVisibleWindowHandlesAndNotifyWindowsChangeIfNeededLocked() {
         final SparseArray<List<InputWindowHandle>> tempWindowHandleList = new SparseArray<>();
 
         for (final InputWindowHandle windowHandle : mVisibleWindows) {
@@ -257,15 +188,15 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
             if (inputWindowHandles == null) {
                 inputWindowHandles = new ArrayList<>();
                 tempWindowHandleList.put(windowHandle.displayId, inputWindowHandles);
+                generateMagnificationSpecInverseMatrixLocked(windowHandle.displayId);
             }
             inputWindowHandles.add(windowHandle);
         }
-        findMagnificationSpecInverseMatrixIfNeeded(tempWindowHandleList);
 
         final List<Integer> displayIdsForWindowsChanged = new ArrayList<>();
-        getDisplaysForWindowsChanged(displayIdsForWindowsChanged, tempWindowHandleList,
-                mInputWindowHandlesOnDisplays);
 
+        getDisplaysForWindowsChangedLocked(displayIdsForWindowsChanged, tempWindowHandleList,
+                mInputWindowHandlesOnDisplays);
         // Clones all windows from the callback of the surface flinger.
         mInputWindowHandlesOnDisplays.clear();
         for (int i = 0; i < tempWindowHandleList.size(); i++) {
@@ -273,7 +204,7 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
             mInputWindowHandlesOnDisplays.put(displayId, tempWindowHandleList.get(displayId));
         }
 
-        if (!displayIdsForWindowsChanged.isEmpty()) {
+        if (displayIdsForWindowsChanged.size() > 0) {
             if (!mHandler.hasMessages(MyHandler.MESSAGE_NOTIFY_WINDOWS_CHANGED)) {
                 mHandler.obtainMessage(MyHandler.MESSAGE_NOTIFY_WINDOWS_CHANGED,
                         displayIdsForWindowsChanged).sendToTarget();
@@ -286,8 +217,7 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
                 SURFACE_FLINGER_CALLBACK_WINDOWS_STABLE_TIMES_MS);
     }
 
-    @GuardedBy("mLock")
-    private static void getDisplaysForWindowsChanged(List<Integer> outDisplayIdsForWindowsChanged,
+    private void getDisplaysForWindowsChangedLocked(List<Integer> outDisplayIdsForWindowsChanged,
             SparseArray<List<InputWindowHandle>> newWindowsList,
             SparseArray<List<InputWindowHandle>> oldWindowsList) {
         for (int i = 0; i < newWindowsList.size(); i++) {
@@ -295,14 +225,13 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
             final List<InputWindowHandle> newWindows = newWindowsList.get(displayId);
             final List<InputWindowHandle> oldWindows = oldWindowsList.get(displayId);
 
-            if (hasWindowsChanged(newWindows, oldWindows)) {
+            if (hasWindowsChangedLocked(newWindows, oldWindows)) {
                 outDisplayIdsForWindowsChanged.add(displayId);
             }
         }
     }
 
-    @GuardedBy("mLock")
-    private static boolean hasWindowsChanged(List<InputWindowHandle> newWindows,
+    private boolean hasWindowsChangedLocked(List<InputWindowHandle> newWindows,
             List<InputWindowHandle> oldWindows) {
         if (oldWindows == null || oldWindows.size() != newWindows.size()) {
             return true;
@@ -324,195 +253,34 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
         return false;
     }
 
-    @GuardedBy("mLock")
-    private void findMagnificationSpecInverseMatrixIfNeeded(SparseArray<List<InputWindowHandle>>
-            windowHandleList) {
-        MagnificationSpec currentMagnificationSpec;
-        MagnificationSpec previousMagnificationSpec;
-        for (int i = 0; i < windowHandleList.size(); i++) {
-            final int displayId = windowHandleList.keyAt(i);
-            List<InputWindowHandle> inputWindowHandles = windowHandleList.get(displayId);
-
-            final MagnificationSpec currentSpec = mCurrentMagnificationSpec.get(displayId);
-            if (currentSpec == null) {
-                continue;
-            }
-            currentMagnificationSpec = new MagnificationSpec();
-            currentMagnificationSpec.setTo(currentSpec);
-
-            final MagnificationSpec previousSpec = mPreviousMagnificationSpec.get(displayId);
-
-            if (previousSpec == null) {
-                final Matrix inverseMatrixForCurrentSpec = new Matrix();
-                generateInverseMatrix(currentMagnificationSpec, inverseMatrixForCurrentSpec);
-                mMagnificationSpecInverseMatrix.put(displayId, inverseMatrixForCurrentSpec);
-                continue;
-            }
-            previousMagnificationSpec = new MagnificationSpec();
-            previousMagnificationSpec.setTo(previousSpec);
-
-            generateInverseMatrixBasedOnProperMagnificationSpecForDisplay(inputWindowHandles,
-                    currentMagnificationSpec, previousMagnificationSpec);
-        }
-    }
-
-    @GuardedBy("mLock")
-    private void generateInverseMatrixBasedOnProperMagnificationSpecForDisplay(
-            List<InputWindowHandle> inputWindowHandles, MagnificationSpec currentMagnificationSpec,
-            MagnificationSpec previousMagnificationSpec) {
-        // To decrease the counts of holding the WindowManagerService#mGlogalLock in
-        // the method, getWindowTransformMatrix(), this for loop begins from the bottom
-        // to top of the z-order windows.
-        for (int index = inputWindowHandles.size() - 1; index >= 0; index--) {
-            final Matrix windowTransformMatrix = mTempMatrix2;
-            final InputWindowHandle windowHandle = inputWindowHandles.get(index);
-            final IBinder iBinder = windowHandle.getWindow().asBinder();
-
-            if (getWindowTransformMatrix(iBinder, windowTransformMatrix)) {
-                generateMagnificationSpecInverseMatrix(windowHandle, currentMagnificationSpec,
-                        previousMagnificationSpec, windowTransformMatrix);
-
-                break;
-            }
-        }
-    }
-
-    @GuardedBy("mLock")
-    private boolean getWindowTransformMatrix(IBinder iBinder, Matrix outTransform) {
-        final Matrix windowMatrix = iBinder != null
-                ? mWindowsTransformMatrixMap.get(iBinder) : null;
-
-        if (windowMatrix == null) {
-            return false;
-        }
-        outTransform.set(windowMatrix);
-
-        return true;
-    }
-
-    /**
-     * Generates the inverse matrix based on the proper magnification spec.
-     * The magnification spec associated with the InputWindowHandle might not the current
-     * spec set by WM, which might be the previous one. To find the appropriate spec,
-     * we store two consecutive magnification specs, and found out which one is the proper
-     * one closing the identity matrix for generating the inverse matrix.
-     *
-     * @param inputWindowHandle The window from the surface flinger.
-     * @param currentMagnificationSpec The current magnification spec.
-     * @param previousMagnificationSpec The previous magnification spec.
-     * @param transformMatrix The transform matrix of the window doesn't consider the
-     *                        magnifying effect.
-     */
-    @GuardedBy("mLock")
-    private void generateMagnificationSpecInverseMatrix(InputWindowHandle inputWindowHandle,
-            @NonNull MagnificationSpec currentMagnificationSpec,
-            @NonNull MagnificationSpec previousMagnificationSpec, Matrix transformMatrix) {
-
-        final float[] identityMatrixFloatsForCurrentSpec = mTempFloat1;
-        computeIdentityMatrix(inputWindowHandle, currentMagnificationSpec,
-                transformMatrix, identityMatrixFloatsForCurrentSpec);
-        final float[] identityMatrixFloatsForPreviousSpec = mTempFloat2;
-        computeIdentityMatrix(inputWindowHandle, previousMagnificationSpec,
-                transformMatrix, identityMatrixFloatsForPreviousSpec);
-
-        Matrix inverseMatrixForMagnificationSpec = new Matrix();
-        if (selectProperMagnificationSpecByComparingIdentityDegree(
-                identityMatrixFloatsForCurrentSpec, identityMatrixFloatsForPreviousSpec)) {
-            generateInverseMatrix(currentMagnificationSpec,
-                    inverseMatrixForMagnificationSpec);
-
-            // Choosing the current spec means the previous spec is out of date,
-            // so removing it. And if the current spec is no magnifying, meaning
-            // the magnifying is done so removing the inverse matrix of this display.
-            mPreviousMagnificationSpec.remove(inputWindowHandle.displayId);
-            if (currentMagnificationSpec.isNop()) {
-                mCurrentMagnificationSpec.remove(inputWindowHandle.displayId);
-                mMagnificationSpecInverseMatrix.remove(inputWindowHandle.displayId);
-                return;
-            }
-        } else {
-            generateInverseMatrix(previousMagnificationSpec,
-                    inverseMatrixForMagnificationSpec);
+    private void generateMagnificationSpecInverseMatrixLocked(int displayId) {
+        MagnificationSpec spec = new MagnificationSpec();
+        if (!mAccessibilityController.getMagnificationSpecForDisplay(displayId, spec)) {
+            mMagnificationSpecInverseMatrix.remove(displayId);
+            return;
         }
-
-        mMagnificationSpecInverseMatrix.put(inputWindowHandle.displayId,
-                inverseMatrixForMagnificationSpec);
-    }
-
-    /**
-     * Computes the identity matrix for generating the
-     * inverse matrix based on below formula under window is at the stable state:
-     * inputWindowHandle#transform * MagnificationSpecMatrix * WindowState#transform
-     * = IdentityMatrix
-     */
-    @GuardedBy("mLock")
-    private void computeIdentityMatrix(InputWindowHandle inputWindowHandle,
-            @NonNull MagnificationSpec magnificationSpec,
-            Matrix transformMatrix, float[] magnifyMatrixFloats) {
-        final Matrix specMatrix = mTempMatrix1;
-        transformMagnificationSpecToMatrix(magnificationSpec, specMatrix);
-
-        final Matrix resultMatrix = new Matrix(inputWindowHandle.transform);
-        resultMatrix.preConcat(specMatrix);
-        resultMatrix.preConcat(transformMatrix);
-
-        resultMatrix.getValues(magnifyMatrixFloats);
-    }
-
-    /**
-     * @return true if selecting the magnification spec one, otherwise selecting the
-     * magnification spec two.
-     */
-    @GuardedBy("mLock")
-    private boolean selectProperMagnificationSpecByComparingIdentityDegree(
-            float[] magnifyMatrixFloatsForSpecOne,
-            float[] magnifyMatrixFloatsForSpecTwo) {
-        final float[] IdentityMatrixValues = mTempFloat3;
-        Matrix.IDENTITY_MATRIX.getValues(IdentityMatrixValues);
-
-        final float scaleDiffForSpecOne = Math.abs(IdentityMatrixValues[Matrix.MSCALE_X]
-                - magnifyMatrixFloatsForSpecOne[Matrix.MSCALE_X]);
-        final float scaleDiffForSpecTwo = Math.abs(IdentityMatrixValues[Matrix.MSCALE_X]
-                - magnifyMatrixFloatsForSpecTwo[Matrix.MSCALE_X]);
-        final float offsetXDiffForSpecOne = Math.abs(IdentityMatrixValues[Matrix.MTRANS_X]
-                - magnifyMatrixFloatsForSpecOne[Matrix.MTRANS_X]);
-        final float offsetXDiffForSpecTwo = Math.abs(IdentityMatrixValues[Matrix.MTRANS_X]
-                - magnifyMatrixFloatsForSpecTwo[Matrix.MTRANS_X]);
-        final float offsetYDiffForSpecOne = Math.abs(IdentityMatrixValues[Matrix.MTRANS_Y]
-                - magnifyMatrixFloatsForSpecOne[Matrix.MTRANS_Y]);
-        final float offsetYDiffForSpecTwo = Math.abs(IdentityMatrixValues[Matrix.MTRANS_Y]
-                - magnifyMatrixFloatsForSpecTwo[Matrix.MTRANS_Y]);
-        final float offsetDiffForSpecOne = offsetXDiffForSpecOne
-                + offsetYDiffForSpecOne;
-        final float offsetDiffForSpecTwo = offsetXDiffForSpecTwo
-                + offsetYDiffForSpecTwo;
-
-        return Float.compare(scaleDiffForSpecTwo, scaleDiffForSpecOne) > 0
-                || (Float.compare(scaleDiffForSpecTwo, scaleDiffForSpecOne) == 0
-                && Float.compare(offsetDiffForSpecTwo, offsetDiffForSpecOne) > 0);
-    }
-
-    @GuardedBy("mLock")
-    private static void generateInverseMatrix(MagnificationSpec spec, Matrix outMatrix) {
-        outMatrix.reset();
+        sTempFloats[Matrix.MSCALE_X] = spec.scale;
+        sTempFloats[Matrix.MSKEW_Y] = 0;
+        sTempFloats[Matrix.MSKEW_X] = 0;
+        sTempFloats[Matrix.MSCALE_Y] = spec.scale;
+        sTempFloats[Matrix.MTRANS_X] = spec.offsetX;
+        sTempFloats[Matrix.MTRANS_Y] = spec.offsetY;
+        sTempFloats[Matrix.MPERSP_0] = 0;
+        sTempFloats[Matrix.MPERSP_1] = 0;
+        sTempFloats[Matrix.MPERSP_2] = 1;
 
         final Matrix tempMatrix = new Matrix();
-        transformMagnificationSpecToMatrix(spec, tempMatrix);
+        tempMatrix.setValues(sTempFloats);
+
+        final Matrix inverseMatrix = new Matrix();
+        final boolean result = tempMatrix.invert(inverseMatrix);
 
-        final boolean result = tempMatrix.invert(outMatrix);
         if (!result) {
             Slog.e(TAG, "Can't inverse the magnification spec matrix with the "
-                    + "magnification spec = " + spec);
-            outMatrix.reset();
+                    + "magnification spec = " + spec + " on the displayId = " + displayId);
+            return;
         }
-    }
-
-    @GuardedBy("mLock")
-    private static void transformMagnificationSpecToMatrix(MagnificationSpec spec,
-            Matrix outMatrix) {
-        outMatrix.reset();
-        outMatrix.postScale(spec.scale, spec.scale);
-        outMatrix.postTranslate(spec.offsetX, spec.offsetY);
+        mMagnificationSpecInverseMatrix.set(displayId, inverseMatrix);
     }
 
     private void notifyWindowsChanged(@NonNull List<Integer> displayIdsForWindowsChanged) {
@@ -542,9 +310,6 @@ public final class AccessibilityWindowsPopulator extends WindowInfosListener {
         mMagnificationSpecInverseMatrix.clear();
         mVisibleWindows.clear();
         mDisplayInfos.clear();
-        mCurrentMagnificationSpec.clear();
-        mPreviousMagnificationSpec.clear();
-        mWindowsTransformMatrixMap.clear();
         mWindowsNotificationEnabled = false;
         mHandler.removeCallbacksAndMessages(null);
     }