| /* |
| * Copyright (C) 2016 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.server.wm; |
| |
| import static com.android.server.wm.TaskSnapshotPersister.DISABLE_FULL_SIZED_BITMAPS; |
| import static com.android.server.wm.TaskSnapshotPersister.REDUCED_SCALE; |
| import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_SCREENSHOT; |
| import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME; |
| import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM; |
| |
| import android.annotation.Nullable; |
| import android.app.ActivityManager; |
| import android.app.ActivityManager.TaskSnapshot; |
| import android.content.pm.PackageManager; |
| import android.graphics.Bitmap; |
| import android.graphics.GraphicBuffer; |
| import android.graphics.Rect; |
| import android.os.Environment; |
| import android.os.Handler; |
| import android.util.ArraySet; |
| import android.util.Slog; |
| import android.view.DisplayListCanvas; |
| import android.view.RenderNode; |
| import android.view.SurfaceControl; |
| import android.view.ThreadedRenderer; |
| import android.view.WindowManager.LayoutParams; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.server.policy.WindowManagerPolicy.ScreenOffListener; |
| import com.android.server.policy.WindowManagerPolicy.StartingSurface; |
| import com.android.server.wm.TaskSnapshotSurface.SystemBarBackgroundPainter; |
| |
| import com.google.android.collect.Sets; |
| |
| import java.io.PrintWriter; |
| |
| /** |
| * When an app token becomes invisible, we take a snapshot (bitmap) of the corresponding task and |
| * put it into our cache. Internally we use gralloc buffers to be able to draw them wherever we |
| * like without any copying. |
| * <p> |
| * System applications may retrieve a snapshot to represent the current state of a task, and draw |
| * them in their own process. |
| * <p> |
| * When we task becomes visible again, we show a starting window with the snapshot as the content to |
| * make app transitions more responsive. |
| * <p> |
| * To access this class, acquire the global window manager lock. |
| */ |
| class TaskSnapshotController { |
| private static final String TAG = TAG_WITH_CLASS_NAME ? "TaskSnapshotController" : TAG_WM; |
| |
| /** |
| * Return value for {@link #getSnapshotMode}: We are allowed to take a real screenshot to be |
| * used as the snapshot. |
| */ |
| @VisibleForTesting |
| static final int SNAPSHOT_MODE_REAL = 0; |
| |
| /** |
| * Return value for {@link #getSnapshotMode}: We are not allowed to take a real screenshot but |
| * we should try to use the app theme to create a dummy representation of the app. |
| */ |
| @VisibleForTesting |
| static final int SNAPSHOT_MODE_APP_THEME = 1; |
| |
| /** |
| * Return value for {@link #getSnapshotMode}: We aren't allowed to take any snapshot. |
| */ |
| @VisibleForTesting |
| static final int SNAPSHOT_MODE_NONE = 2; |
| |
| private final WindowManagerService mService; |
| |
| private final TaskSnapshotCache mCache; |
| private final TaskSnapshotPersister mPersister = new TaskSnapshotPersister( |
| Environment::getDataSystemCeDirectory); |
| private final TaskSnapshotLoader mLoader = new TaskSnapshotLoader(mPersister); |
| private final ArraySet<Task> mTmpTasks = new ArraySet<>(); |
| private final Handler mHandler = new Handler(); |
| |
| private final Rect mTmpRect = new Rect(); |
| |
| /** |
| * Flag indicating whether we are running on an Android TV device. |
| */ |
| private final boolean mIsRunningOnTv; |
| |
| /** |
| * Flag indicating whether we are running on an IoT device. |
| */ |
| private final boolean mIsRunningOnIoT; |
| |
| /** |
| * Flag indicating whether we are running on an Android Wear device. |
| */ |
| private final boolean mIsRunningOnWear; |
| |
| TaskSnapshotController(WindowManagerService service) { |
| mService = service; |
| mCache = new TaskSnapshotCache(mService, mLoader); |
| mIsRunningOnTv = mService.mContext.getPackageManager().hasSystemFeature( |
| PackageManager.FEATURE_LEANBACK); |
| mIsRunningOnIoT = mService.mContext.getPackageManager().hasSystemFeature( |
| PackageManager.FEATURE_EMBEDDED); |
| mIsRunningOnWear = mService.mContext.getPackageManager().hasSystemFeature( |
| PackageManager.FEATURE_WATCH); |
| } |
| |
| void systemReady() { |
| mPersister.start(); |
| } |
| |
| void onTransitionStarting() { |
| handleClosingApps(mService.mClosingApps); |
| } |
| |
| /** |
| * Called when the visibility of an app changes outside of the regular app transition flow. |
| */ |
| void notifyAppVisibilityChanged(AppWindowToken appWindowToken, boolean visible) { |
| if (!visible) { |
| handleClosingApps(Sets.newArraySet(appWindowToken)); |
| } |
| } |
| |
| private void handleClosingApps(ArraySet<AppWindowToken> closingApps) { |
| if (shouldDisableSnapshots()) { |
| return; |
| } |
| |
| // We need to take a snapshot of the task if and only if all activities of the task are |
| // either closing or hidden. |
| getClosingTasks(closingApps, mTmpTasks); |
| snapshotTasks(mTmpTasks); |
| |
| } |
| |
| private void snapshotTasks(ArraySet<Task> tasks) { |
| for (int i = tasks.size() - 1; i >= 0; i--) { |
| final Task task = tasks.valueAt(i); |
| final int mode = getSnapshotMode(task); |
| final TaskSnapshot snapshot; |
| switch (mode) { |
| case SNAPSHOT_MODE_NONE: |
| continue; |
| case SNAPSHOT_MODE_APP_THEME: |
| snapshot = drawAppThemeSnapshot(task); |
| break; |
| case SNAPSHOT_MODE_REAL: |
| snapshot = snapshotTask(task); |
| break; |
| default: |
| snapshot = null; |
| break; |
| } |
| if (snapshot != null) { |
| final GraphicBuffer buffer = snapshot.getSnapshot(); |
| if (buffer.getWidth() == 0 || buffer.getHeight() == 0) { |
| buffer.destroy(); |
| Slog.e(TAG, "Invalid task snapshot dimensions " + buffer.getWidth() + "x" |
| + buffer.getHeight()); |
| } else { |
| mCache.putSnapshot(task, snapshot); |
| mPersister.persistSnapshot(task.mTaskId, task.mUserId, snapshot); |
| if (task.getController() != null) { |
| task.getController().reportSnapshotChanged(snapshot); |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Retrieves a snapshot. If {@param restoreFromDisk} equals {@code true}, DO HOLD THE WINDOW |
| * MANAGER LOCK WHEN CALLING THIS METHOD! |
| */ |
| @Nullable TaskSnapshot getSnapshot(int taskId, int userId, boolean restoreFromDisk, |
| boolean reducedResolution) { |
| return mCache.getSnapshot(taskId, userId, restoreFromDisk, reducedResolution |
| || DISABLE_FULL_SIZED_BITMAPS); |
| } |
| |
| /** |
| * Creates a starting surface for {@param token} with {@param snapshot}. DO NOT HOLD THE WINDOW |
| * MANAGER LOCK WHEN CALLING THIS METHOD! |
| */ |
| StartingSurface createStartingSurface(AppWindowToken token, |
| TaskSnapshot snapshot) { |
| return TaskSnapshotSurface.create(mService, token, snapshot); |
| } |
| |
| private TaskSnapshot snapshotTask(Task task) { |
| final AppWindowToken top = task.getTopChild(); |
| if (top == null) { |
| return null; |
| } |
| final WindowState mainWindow = top.findMainWindow(); |
| if (mainWindow == null) { |
| return null; |
| } |
| if (!mService.mPolicy.isScreenOn()) { |
| if (DEBUG_SCREENSHOT) { |
| Slog.i(TAG_WM, "Attempted to take screenshot while display was off."); |
| } |
| return null; |
| } |
| if (task.getSurfaceControl() == null) { |
| return null; |
| } |
| |
| if (top.hasCommittedReparentToAnimationLeash()) { |
| if (DEBUG_SCREENSHOT) { |
| Slog.w(TAG_WM, "Failed to take screenshot. App is animating " + top); |
| } |
| return null; |
| } |
| |
| final boolean hasVisibleChild = top.forAllWindows( |
| // Ensure at least one window for the top app is visible before attempting to take |
| // a screenshot. Visible here means that the WSA surface is shown and has an alpha |
| // greater than 0. |
| ws -> ws.mWinAnimator != null && ws.mWinAnimator.getShown() |
| && ws.mWinAnimator.mLastAlpha > 0f, true); |
| |
| if (!hasVisibleChild) { |
| if (DEBUG_SCREENSHOT) { |
| Slog.w(TAG_WM, "Failed to take screenshot. No visible windows for " + task); |
| } |
| return null; |
| } |
| |
| final boolean isLowRamDevice = ActivityManager.isLowRamDeviceStatic(); |
| final float scaleFraction = isLowRamDevice ? REDUCED_SCALE : 1f; |
| task.getBounds(mTmpRect); |
| mTmpRect.offsetTo(0, 0); |
| |
| final GraphicBuffer buffer = SurfaceControl.captureLayers( |
| task.getSurfaceControl().getHandle(), mTmpRect, scaleFraction); |
| |
| if (buffer == null || buffer.getWidth() <= 1 || buffer.getHeight() <= 1) { |
| if (DEBUG_SCREENSHOT) { |
| Slog.w(TAG_WM, "Failed to take screenshot for " + task); |
| } |
| return null; |
| } |
| return new TaskSnapshot(buffer, top.getConfiguration().orientation, |
| getInsetsFromTaskBounds(mainWindow, task), |
| isLowRamDevice /* reduced */, scaleFraction /* scale */); |
| } |
| |
| private boolean shouldDisableSnapshots() { |
| return mIsRunningOnWear || mIsRunningOnTv || mIsRunningOnIoT; |
| } |
| |
| private Rect getInsetsFromTaskBounds(WindowState state, Task task) { |
| final Rect r = new Rect(); |
| r.set(state.getContentFrameLw()); |
| r.intersectUnchecked(state.getStableFrameLw()); |
| |
| final Rect taskBounds = task.getBounds(); |
| |
| r.set(Math.max(0, r.left - taskBounds.left), |
| Math.max(0, r.top - taskBounds.top), |
| Math.max(0, taskBounds.right - r.right), |
| Math.max(0, taskBounds.bottom - r.bottom)); |
| return r; |
| } |
| |
| /** |
| * Retrieves all closing tasks based on the list of closing apps during an app transition. |
| */ |
| @VisibleForTesting |
| void getClosingTasks(ArraySet<AppWindowToken> closingApps, ArraySet<Task> outClosingTasks) { |
| outClosingTasks.clear(); |
| for (int i = closingApps.size() - 1; i >= 0; i--) { |
| final AppWindowToken atoken = closingApps.valueAt(i); |
| final Task task = atoken.getTask(); |
| |
| // If the task of the app is not visible anymore, it means no other app in that task |
| // is opening. Thus, the task is closing. |
| if (task != null && !task.isVisible()) { |
| outClosingTasks.add(task); |
| } |
| } |
| } |
| |
| @VisibleForTesting |
| int getSnapshotMode(Task task) { |
| final AppWindowToken topChild = task.getTopChild(); |
| if (!task.isActivityTypeStandardOrUndefined()) { |
| return SNAPSHOT_MODE_NONE; |
| } else if (topChild != null && topChild.shouldUseAppThemeSnapshot()) { |
| return SNAPSHOT_MODE_APP_THEME; |
| } else { |
| return SNAPSHOT_MODE_REAL; |
| } |
| } |
| |
| /** |
| * If we are not allowed to take a real screenshot, this attempts to represent the app as best |
| * as possible by using the theme's window background. |
| */ |
| private TaskSnapshot drawAppThemeSnapshot(Task task) { |
| final AppWindowToken topChild = task.getTopChild(); |
| if (topChild == null) { |
| return null; |
| } |
| final WindowState mainWindow = topChild.findMainWindow(); |
| if (mainWindow == null) { |
| return null; |
| } |
| final int color = task.getTaskDescription().getBackgroundColor(); |
| final int statusBarColor = task.getTaskDescription().getStatusBarColor(); |
| final int navigationBarColor = task.getTaskDescription().getNavigationBarColor(); |
| final LayoutParams attrs = mainWindow.getAttrs(); |
| final SystemBarBackgroundPainter decorPainter = new SystemBarBackgroundPainter(attrs.flags, |
| attrs.privateFlags, attrs.systemUiVisibility, statusBarColor, navigationBarColor); |
| final int width = mainWindow.getFrameLw().width(); |
| final int height = mainWindow.getFrameLw().height(); |
| |
| final RenderNode node = RenderNode.create("TaskSnapshotController", null); |
| node.setLeftTopRightBottom(0, 0, width, height); |
| node.setClipToBounds(false); |
| final DisplayListCanvas c = node.start(width, height); |
| c.drawColor(color); |
| decorPainter.setInsets(mainWindow.mContentInsets, mainWindow.mStableInsets); |
| decorPainter.drawDecors(c, null /* statusBarExcludeFrame */); |
| node.end(c); |
| final Bitmap hwBitmap = ThreadedRenderer.createHardwareBitmap(node, width, height); |
| if (hwBitmap == null) { |
| return null; |
| } |
| return new TaskSnapshot(hwBitmap.createGraphicBufferHandle(), |
| topChild.getConfiguration().orientation, mainWindow.mStableInsets, |
| ActivityManager.isLowRamDeviceStatic() /* reduced */, 1.0f /* scale */); |
| } |
| |
| /** |
| * Called when an {@link AppWindowToken} has been removed. |
| */ |
| void onAppRemoved(AppWindowToken wtoken) { |
| mCache.onAppRemoved(wtoken); |
| } |
| |
| /** |
| * Called when the process of an {@link AppWindowToken} has died. |
| */ |
| void onAppDied(AppWindowToken wtoken) { |
| mCache.onAppDied(wtoken); |
| } |
| |
| void notifyTaskRemovedFromRecents(int taskId, int userId) { |
| mCache.onTaskRemoved(taskId); |
| mPersister.onTaskRemovedFromRecents(taskId, userId); |
| } |
| |
| /** |
| * See {@link TaskSnapshotPersister#removeObsoleteFiles} |
| */ |
| void removeObsoleteTaskFiles(ArraySet<Integer> persistentTaskIds, int[] runningUserIds) { |
| mPersister.removeObsoleteFiles(persistentTaskIds, runningUserIds); |
| } |
| |
| /** |
| * Temporarily pauses/unpauses persisting of task snapshots. |
| * |
| * @param paused Whether task snapshot persisting should be paused. |
| */ |
| void setPersisterPaused(boolean paused) { |
| mPersister.setPaused(paused); |
| } |
| |
| /** |
| * Called when screen is being turned off. |
| */ |
| void screenTurningOff(ScreenOffListener listener) { |
| if (shouldDisableSnapshots()) { |
| listener.onScreenOff(); |
| return; |
| } |
| |
| // We can't take a snapshot when screen is off, so take a snapshot now! |
| mHandler.post(() -> { |
| try { |
| synchronized (mService.mWindowMap) { |
| mTmpTasks.clear(); |
| mService.mRoot.forAllTasks(task -> { |
| if (task.isVisible()) { |
| mTmpTasks.add(task); |
| } |
| }); |
| snapshotTasks(mTmpTasks); |
| } |
| } finally { |
| listener.onScreenOff(); |
| } |
| }); |
| } |
| |
| void dump(PrintWriter pw, String prefix) { |
| mCache.dump(pw, prefix); |
| } |
| } |