/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.server.wm;
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import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
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import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
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import android.app.ActivityManager.TaskSnapshot;
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import android.content.ComponentName;
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import android.graphics.Bitmap;
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import android.graphics.Bitmap.Config;
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import android.graphics.BitmapFactory;
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import android.graphics.BitmapFactory.Options;
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import android.graphics.GraphicBuffer;
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import android.graphics.Rect;
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import android.util.Slog;
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import com.android.server.wm.nano.WindowManagerProtos.TaskSnapshotProto;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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/**
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* Loads a persisted {@link TaskSnapshot} from disk.
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* <p>
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* Do not hold the window manager lock when accessing this class.
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* <p>
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* Test class: {@link TaskSnapshotPersisterLoaderTest}
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*/
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class TaskSnapshotLoader {
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private static final String TAG = TAG_WITH_CLASS_NAME ? "TaskSnapshotLoader" : TAG_WM;
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private final TaskSnapshotPersister mPersister;
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TaskSnapshotLoader(TaskSnapshotPersister persister) {
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mPersister = persister;
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}
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/**
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* Loads a task from the disk.
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* <p>
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* Do not hold the window manager lock when calling this method, as we directly read data from
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* disk here, which might be slow.
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*
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* @param taskId The id of the task to load.
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* @param userId The id of the user the task belonged to.
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* @param reducedResolution Whether to load a reduced resolution version of the snapshot.
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* @return The loaded {@link TaskSnapshot} or {@code null} if it couldn't be loaded.
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*/
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TaskSnapshot loadTask(int taskId, int userId, boolean reducedResolution) {
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final File protoFile = mPersister.getProtoFile(taskId, userId);
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final File bitmapFile = reducedResolution
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? mPersister.getReducedResolutionBitmapFile(taskId, userId)
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: mPersister.getBitmapFile(taskId, userId);
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if (bitmapFile == null || !protoFile.exists() || !bitmapFile.exists()) {
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return null;
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}
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try {
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final byte[] bytes = Files.readAllBytes(protoFile.toPath());
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final TaskSnapshotProto proto = TaskSnapshotProto.parseFrom(bytes);
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final Options options = new Options();
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options.inPreferredConfig = Config.HARDWARE;
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final Bitmap bitmap = BitmapFactory.decodeFile(bitmapFile.getPath(), options);
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if (bitmap == null) {
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Slog.w(TAG, "Failed to load bitmap: " + bitmapFile.getPath());
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return null;
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}
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final GraphicBuffer buffer = bitmap.createGraphicBufferHandle();
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if (buffer == null) {
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Slog.w(TAG, "Failed to retrieve gralloc buffer for bitmap: "
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+ bitmapFile.getPath());
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return null;
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}
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final ComponentName topActivityComponent = ComponentName.unflattenFromString(
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proto.topActivityComponent);
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// For legacy snapshots, restore the scale based on the reduced resolution state
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final float legacyScale = reducedResolution ? mPersister.getReducedScale() : 1f;
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final float scale = Float.compare(proto.scale, 0f) != 0 ? proto.scale : legacyScale;
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return new TaskSnapshot(topActivityComponent, buffer, bitmap.getColorSpace(),
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proto.orientation,
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new Rect(proto.insetLeft, proto.insetTop, proto.insetRight, proto.insetBottom),
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reducedResolution, scale, proto.isRealSnapshot, proto.windowingMode,
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proto.systemUiVisibility, proto.isTranslucent);
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} catch (IOException e) {
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Slog.w(TAG, "Unable to load task snapshot data for taskId=" + taskId);
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return null;
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}
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}
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}
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