Corrects invalidation logic for layered views

A bug in the invalidation logic meant that changes to a view
would not cause parents in the view hiearchy that were set to have
a layer (e.g., View.LAYER_TYPE_HARDWARE) to get invalidated properly.
So even though the child view was all set to recreate its display list
according to the property change, the layer in the tree above it would stay
as-is, meaning that the change would not show up on the screen.

Issue #5887530 DropTarget text does not change color with the icon

Change-Id: Ie6eac4f406d172cb437822d9fe76340ab2afaf1c

1 files changed, 162 insertions, 0 deletions

diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/ViewLayerInvalidationActivity.java b/tests/HwAccelerationTest/src/com/android/test/hwui/ViewLayerInvalidationActivity.java
new file mode 100644
index 0000000..6d47d6c
--- /dev/null
+++ b/tests/HwAccelerationTest/src/com/android/test/hwui/ViewLayerInvalidationActivity.java
@@ -0,0 +1,162 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.test.hwui;
+
+import android.app.Activity;
+import android.graphics.Color;
+import android.os.Bundle;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import java.util.ArrayList;
+
+public class ViewLayerInvalidationActivity extends Activity {
+
+    int currentColor = Color.WHITE;
+    boolean nestedLayersOn = false;
+    ArrayList<LinearLayout> linearLayouts = new ArrayList<LinearLayout>();
+    ArrayList<LinearLayout> topLayouts = new ArrayList<LinearLayout>();
+    ArrayList<TextView> textViews = new ArrayList<TextView>();
+    LinearLayout container = null;
+    boolean randomInvalidates = false;
+    TextView nestedStatusTV, invalidateStatusTV;
+    static final String NO_NESTING = "Nested Layer: NO   ";
+    static final String NESTING = "Nested Layers: YES   ";
+    static final String NO_INVALIDATING = "Random Invalidating: NO   ";
+    static final String INVALIDATING = "Random Invalidating: YES   ";
+    static final int TEXT_COLOR_INTERVAL = 400;
+    static final int INVALIDATING_INTERVAL = 1000;
+    static final int NESTING_INTERVAL = 2000;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.view_layer_invalidation);
+
+        container = (LinearLayout) findViewById(R.id.container);
+        final LinearLayout container1 = (LinearLayout) findViewById(R.id.container1);
+        final LinearLayout container2 = (LinearLayout) findViewById(R.id.container2);
+        final LinearLayout container3 = (LinearLayout) findViewById(R.id.container3);
+        nestedStatusTV = (TextView) findViewById(R.id.nestedStatus);
+        invalidateStatusTV = (TextView) findViewById(R.id.invalidateStatus);
+        final TextView tva = (TextView) findViewById(R.id.textviewa);
+
+        topLayouts.add(container1);
+        topLayouts.add(container2);
+        topLayouts.add(container3);
+
+        collectLinearLayouts(container);
+        collectTextViews(container);
+
+        nestedStatusTV.setText(NO_NESTING);
+        invalidateStatusTV.setText(NO_INVALIDATING);
+
+        tva.setLayerType(View.LAYER_TYPE_HARDWARE, null);
+        container1.setLayerType(View.LAYER_TYPE_HARDWARE, null);
+        container2.setLayerType(View.LAYER_TYPE_HARDWARE, null);
+        container3.setLayerType(View.LAYER_TYPE_HARDWARE, null);
+
+        container.postDelayed(textColorSetter, TEXT_COLOR_INTERVAL);
+        container.postDelayed(nestedLayerSetter, NESTING_INTERVAL);
+        container.postDelayed(randomInvalidatesSetter, INVALIDATING_INTERVAL);
+    }
+
+    private Runnable textColorSetter = new Runnable() {
+        @Override
+        public void run() {
+            currentColor = (currentColor == Color.WHITE) ? Color.RED : Color.WHITE;
+            for (TextView tv : textViews) {
+                tv.setTextColor(currentColor);
+            }
+            if (randomInvalidates) {
+                randomInvalidator(container);
+            }
+            container.postDelayed(textColorSetter, TEXT_COLOR_INTERVAL);
+        }
+    };
+
+    private Runnable randomInvalidatesSetter = new Runnable() {
+        @Override
+        public void run() {
+            randomInvalidates = !randomInvalidates;
+            invalidateStatusTV.setText(randomInvalidates ? INVALIDATING : NO_INVALIDATING);
+            container.postDelayed(randomInvalidatesSetter, INVALIDATING_INTERVAL);
+        }
+    };
+
+    private Runnable nestedLayerSetter = new Runnable() {
+        @Override
+        public void run() {
+            nestedLayersOn = !nestedLayersOn;
+            nestedStatusTV.setText(nestedLayersOn ? NESTING : NO_NESTING);
+            for (LinearLayout layout : linearLayouts) {
+                layout.setLayerType(nestedLayersOn ?
+                        View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE, null);
+            }
+            if (!nestedLayersOn) {
+                for (LinearLayout layout : topLayouts) {
+                    layout.setLayerType(View.LAYER_TYPE_HARDWARE, null);
+                }
+            }
+            container.postDelayed(nestedLayerSetter, NESTING_INTERVAL);
+        }
+    };
+
+    /**
+     * Invalidates views based on random chance (50%). This is meant to test
+     * invalidating several items in the hierarchy at the same time, which can cause artifacts
+     * if our invalidation-propagation logic is not sound.
+     */
+    private void randomInvalidator(ViewGroup parent) {
+        for (int i = 0; i < parent.getChildCount(); ++i) {
+            View child = parent.getChildAt(i);
+            if (Math.random() < .5) {
+                child.invalidate();
+            }
+            if (child instanceof ViewGroup) {
+                randomInvalidator((ViewGroup) child);
+            }
+        }
+    }
+
+    private void collectLinearLayouts(View view) {
+        if (!(view instanceof LinearLayout)) {
+            return;
+        }
+        LinearLayout parent = (LinearLayout) view;
+        linearLayouts.add(parent);
+        for (int i = 0; i < parent.getChildCount(); ++i) {
+            collectLinearLayouts(parent.getChildAt(i));
+        }
+    }
+
+    private void collectTextViews(View view) {
+        if (view instanceof TextView) {
+            textViews.add((TextView) view);
+            return;
+        }
+        if (!(view instanceof ViewGroup)) {
+            return;
+        }
+        ViewGroup parent = (ViewGroup) view;
+        for (int i = 0; i < parent.getChildCount(); ++i) {
+            collectTextViews(parent.getChildAt(i));
+        }
+    }
+}