/* * 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.server.display; import com.android.internal.util.IndentingPrintWriter; import android.Manifest; import android.content.Context; import android.content.pm.PackageManager; import android.hardware.SensorManager; import android.hardware.display.DisplayManager; import android.hardware.display.DisplayManagerGlobal; import android.hardware.display.DisplayManagerInternal; import android.hardware.display.DisplayViewport; import android.hardware.display.DisplayManagerInternal.DisplayTransactionListener; import android.hardware.display.IDisplayManager; import android.hardware.display.IDisplayManagerCallback; import android.hardware.display.IVirtualDisplayCallback; import android.hardware.display.WifiDisplayStatus; import android.hardware.input.InputManagerInternal; import android.media.projection.IMediaProjection; import android.media.projection.IMediaProjectionManager; import android.os.Binder; import android.os.Handler; import android.os.IBinder; import android.os.IBinder.DeathRecipient; import android.os.Looper; import android.os.Message; import android.os.PowerManager; import android.os.Process; import android.os.RemoteException; import android.os.ServiceManager; import android.os.SystemClock; import android.os.SystemProperties; import android.os.Trace; import android.text.TextUtils; import android.util.Slog; import android.util.SparseArray; import android.view.Display; import android.view.DisplayInfo; import android.view.Surface; import android.view.WindowManagerInternal; import com.android.server.DisplayThread; import com.android.server.LocalServices; import com.android.server.SystemService; import com.android.server.UiThread; import java.io.FileDescriptor; import java.io.PrintWriter; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.concurrent.CopyOnWriteArrayList; /** * Manages attached displays. * <p> * The {@link DisplayManagerService} manages the global lifecycle of displays, * decides how to configure logical displays based on the physical display devices currently * attached, sends notifications to the system and to applications when the state * changes, and so on. * </p><p> * The display manager service relies on a collection of {@link DisplayAdapter} components, * for discovering and configuring physical display devices attached to the system. * There are separate display adapters for each manner that devices are attached: * one display adapter for built-in local displays, one for simulated non-functional * displays when the system is headless, one for simulated overlay displays used for * development, one for wifi displays, etc. * </p><p> * Display adapters are only weakly coupled to the display manager service. * Display adapters communicate changes in display device state to the display manager * service asynchronously via a {@link DisplayAdapter.Listener} registered * by the display manager service. This separation of concerns is important for * two main reasons. First, it neatly encapsulates the responsibilities of these * two classes: display adapters handle individual display devices whereas * the display manager service handles the global state. Second, it eliminates * the potential for deadlocks resulting from asynchronous display device discovery. * </p> * * <h3>Synchronization</h3> * <p> * Because the display manager may be accessed by multiple threads, the synchronization * story gets a little complicated. In particular, the window manager may call into * the display manager while holding a surface transaction with the expectation that * it can apply changes immediately. Unfortunately, that means we can't just do * everything asynchronously (*grump*). * </p><p> * To make this work, all of the objects that belong to the display manager must * use the same lock. We call this lock the synchronization root and it has a unique * type {@link DisplayManagerService.SyncRoot}. Methods that require this lock are * named with the "Locked" suffix. * </p><p> * Where things get tricky is that the display manager is not allowed to make * any potentially reentrant calls, especially into the window manager. We generally * avoid this by making all potentially reentrant out-calls asynchronous. * </p> */ public final class DisplayManagerService extends SystemService { private static final String TAG = "DisplayManagerService"; private static final boolean DEBUG = false; // When this system property is set to 0, WFD is forcibly disabled on boot. // When this system property is set to 1, WFD is forcibly enabled on boot. // Otherwise WFD is enabled according to the value of config_enableWifiDisplay. private static final String FORCE_WIFI_DISPLAY_ENABLE = "persist.debug.wfd.enable"; private static final long WAIT_FOR_DEFAULT_DISPLAY_TIMEOUT = 10000; private static final int MSG_REGISTER_DEFAULT_DISPLAY_ADAPTER = 1; private static final int MSG_REGISTER_ADDITIONAL_DISPLAY_ADAPTERS = 2; private static final int MSG_DELIVER_DISPLAY_EVENT = 3; private static final int MSG_REQUEST_TRAVERSAL = 4; private static final int MSG_UPDATE_VIEWPORT = 5; private final Context mContext; private final DisplayManagerHandler mHandler; private final Handler mUiHandler; private final DisplayAdapterListener mDisplayAdapterListener; private WindowManagerInternal mWindowManagerInternal; private InputManagerInternal mInputManagerInternal; private IMediaProjectionManager mProjectionService; // The synchronization root for the display manager. // This lock guards most of the display manager's state. // NOTE: This is synchronized on while holding WindowManagerService.mWindowMap so never call // into WindowManagerService methods that require mWindowMap while holding this unless you are // very very sure that no deadlock can occur. private final SyncRoot mSyncRoot = new SyncRoot(); // True if in safe mode. // This option may disable certain display adapters. public boolean mSafeMode; // True if we are in a special boot mode where only core applications and // services should be started. This option may disable certain display adapters. public boolean mOnlyCore; // True if the display manager service should pretend there is only one display // and only tell applications about the existence of the default logical display. // The display manager can still mirror content to secondary displays but applications // cannot present unique content on those displays. // Used for demonstration purposes only. private final boolean mSingleDisplayDemoMode; // All callback records indexed by calling process id. public final SparseArray<CallbackRecord> mCallbacks = new SparseArray<CallbackRecord>(); // List of all currently registered display adapters. private final ArrayList<DisplayAdapter> mDisplayAdapters = new ArrayList<DisplayAdapter>(); // List of all currently connected display devices. private final ArrayList<DisplayDevice> mDisplayDevices = new ArrayList<DisplayDevice>(); // List of all logical displays indexed by logical display id. private final SparseArray<LogicalDisplay> mLogicalDisplays = new SparseArray<LogicalDisplay>(); private int mNextNonDefaultDisplayId = Display.DEFAULT_DISPLAY + 1; // List of all display transaction listeners. private final CopyOnWriteArrayList<DisplayTransactionListener> mDisplayTransactionListeners = new CopyOnWriteArrayList<DisplayTransactionListener>(); // Display power controller. private DisplayPowerController mDisplayPowerController; // The overall display state, independent of changes that might influence one // display or another in particular. private int mGlobalDisplayState = Display.STATE_ON; // The overall display brightness. // For now, this only applies to the built-in display but we may split it up eventually. private int mGlobalDisplayBrightness = PowerManager.BRIGHTNESS_DEFAULT; // Set to true when there are pending display changes that have yet to be applied // to the surface flinger state. private boolean mPendingTraversal; // The Wifi display adapter, or null if not registered. private WifiDisplayAdapter mWifiDisplayAdapter; // The number of active wifi display scan requests. private int mWifiDisplayScanRequestCount; // The virtual display adapter, or null if not registered. private VirtualDisplayAdapter mVirtualDisplayAdapter; // Viewports of the default display and the display that should receive touch // input from an external source. Used by the input system. private final DisplayViewport mDefaultViewport = new DisplayViewport(); private final DisplayViewport mExternalTouchViewport = new DisplayViewport(); // Persistent data store for all internal settings maintained by the display manager service. private final PersistentDataStore mPersistentDataStore = new PersistentDataStore(); // Temporary callback list, used when sending display events to applications. // May be used outside of the lock but only on the handler thread. private final ArrayList<CallbackRecord> mTempCallbacks = new ArrayList<CallbackRecord>(); // Temporary display info, used for comparing display configurations. private final DisplayInfo mTempDisplayInfo = new DisplayInfo(); // Temporary viewports, used when sending new viewport information to the // input system. May be used outside of the lock but only on the handler thread. private final DisplayViewport mTempDefaultViewport = new DisplayViewport(); private final DisplayViewport mTempExternalTouchViewport = new DisplayViewport(); // Temporary list of deferred work to perform when setting the display state. // Only used by requestDisplayState. The field is self-synchronized and only // intended for use inside of the requestGlobalDisplayStateInternal function. private final ArrayList<Runnable> mTempDisplayStateWorkQueue = new ArrayList<Runnable>(); public DisplayManagerService(Context context) { super(context); mContext = context; mHandler = new DisplayManagerHandler(DisplayThread.get().getLooper()); mUiHandler = UiThread.getHandler(); mDisplayAdapterListener = new DisplayAdapterListener(); mSingleDisplayDemoMode = SystemProperties.getBoolean("persist.demo.singledisplay", false); PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE); mGlobalDisplayBrightness = pm.getDefaultScreenBrightnessSetting(); } @Override public void onStart() { mHandler.sendEmptyMessage(MSG_REGISTER_DEFAULT_DISPLAY_ADAPTER); publishBinderService(Context.DISPLAY_SERVICE, new BinderService(), true /*allowIsolated*/); publishLocalService(DisplayManagerInternal.class, new LocalService()); } @Override public void onBootPhase(int phase) { if (phase == PHASE_WAIT_FOR_DEFAULT_DISPLAY) { synchronized (mSyncRoot) { long timeout = SystemClock.uptimeMillis() + WAIT_FOR_DEFAULT_DISPLAY_TIMEOUT; while (mLogicalDisplays.get(Display.DEFAULT_DISPLAY) == null) { long delay = timeout - SystemClock.uptimeMillis(); if (delay <= 0) { throw new RuntimeException("Timeout waiting for default display " + "to be initialized."); } if (DEBUG) { Slog.d(TAG, "waitForDefaultDisplay: waiting, timeout=" + delay); } try { mSyncRoot.wait(delay); } catch (InterruptedException ex) { } } } } } // TODO: Use dependencies or a boot phase public void windowManagerAndInputReady() { synchronized (mSyncRoot) { mWindowManagerInternal = LocalServices.getService(WindowManagerInternal.class); mInputManagerInternal = LocalServices.getService(InputManagerInternal.class); scheduleTraversalLocked(false); } } /** * Called when the system is ready to go. */ public void systemReady(boolean safeMode, boolean onlyCore) { synchronized (mSyncRoot) { mSafeMode = safeMode; mOnlyCore = onlyCore; } mHandler.sendEmptyMessage(MSG_REGISTER_ADDITIONAL_DISPLAY_ADAPTERS); } private void registerDisplayTransactionListenerInternal( DisplayTransactionListener listener) { // List is self-synchronized copy-on-write. mDisplayTransactionListeners.add(listener); } private void unregisterDisplayTransactionListenerInternal( DisplayTransactionListener listener) { // List is self-synchronized copy-on-write. mDisplayTransactionListeners.remove(listener); } private void setDisplayInfoOverrideFromWindowManagerInternal( int displayId, DisplayInfo info) { synchronized (mSyncRoot) { LogicalDisplay display = mLogicalDisplays.get(displayId); if (display != null) { if (display.setDisplayInfoOverrideFromWindowManagerLocked(info)) { sendDisplayEventLocked(displayId, DisplayManagerGlobal.EVENT_DISPLAY_CHANGED); scheduleTraversalLocked(false); } } } } private void performTraversalInTransactionFromWindowManagerInternal() { synchronized (mSyncRoot) { if (!mPendingTraversal) { return; } mPendingTraversal = false; performTraversalInTransactionLocked(); } // List is self-synchronized copy-on-write. for (DisplayTransactionListener listener : mDisplayTransactionListeners) { listener.onDisplayTransaction(); } } private void requestGlobalDisplayStateInternal(int state, int brightness) { if (state == Display.STATE_UNKNOWN) { state = Display.STATE_ON; } if (state == Display.STATE_OFF) { brightness = PowerManager.BRIGHTNESS_OFF; } else if (brightness < 0) { brightness = PowerManager.BRIGHTNESS_DEFAULT; } else if (brightness > PowerManager.BRIGHTNESS_ON) { brightness = PowerManager.BRIGHTNESS_ON; } synchronized (mTempDisplayStateWorkQueue) { try { // Update the display state within the lock. // Note that we do not need to schedule traversals here although it // may happen as a side-effect of displays changing state. synchronized (mSyncRoot) { if (mGlobalDisplayState == state && mGlobalDisplayBrightness == brightness) { return; // no change } Trace.traceBegin(Trace.TRACE_TAG_POWER, "requestGlobalDisplayState(" + Display.stateToString(state) + ", brightness=" + brightness + ")"); mGlobalDisplayState = state; mGlobalDisplayBrightness = brightness; applyGlobalDisplayStateLocked(mTempDisplayStateWorkQueue); } // Setting the display power state can take hundreds of milliseconds // to complete so we defer the most expensive part of the work until // after we have exited the critical section to avoid blocking other // threads for a long time. for (int i = 0; i < mTempDisplayStateWorkQueue.size(); i++) { mTempDisplayStateWorkQueue.get(i).run(); } Trace.traceEnd(Trace.TRACE_TAG_POWER); } finally { mTempDisplayStateWorkQueue.clear(); } } } private DisplayInfo getDisplayInfoInternal(int displayId, int callingUid) { synchronized (mSyncRoot) { LogicalDisplay display = mLogicalDisplays.get(displayId); if (display != null) { DisplayInfo info = display.getDisplayInfoLocked(); if (info.hasAccess(callingUid)) { return info; } } return null; } } private int[] getDisplayIdsInternal(int callingUid) { synchronized (mSyncRoot) { final int count = mLogicalDisplays.size(); int[] displayIds = new int[count]; int n = 0; for (int i = 0; i < count; i++) { LogicalDisplay display = mLogicalDisplays.valueAt(i); DisplayInfo info = display.getDisplayInfoLocked(); if (info.hasAccess(callingUid)) { displayIds[n++] = mLogicalDisplays.keyAt(i); } } if (n != count) { displayIds = Arrays.copyOfRange(displayIds, 0, n); } return displayIds; } } private void registerCallbackInternal(IDisplayManagerCallback callback, int callingPid) { synchronized (mSyncRoot) { if (mCallbacks.get(callingPid) != null) { throw new SecurityException("The calling process has already " + "registered an IDisplayManagerCallback."); } CallbackRecord record = new CallbackRecord(callingPid, callback); try { IBinder binder = callback.asBinder(); binder.linkToDeath(record, 0); } catch (RemoteException ex) { // give up throw new RuntimeException(ex); } mCallbacks.put(callingPid, record); } } private void onCallbackDied(CallbackRecord record) { synchronized (mSyncRoot) { mCallbacks.remove(record.mPid); stopWifiDisplayScanLocked(record); } } private void startWifiDisplayScanInternal(int callingPid) { synchronized (mSyncRoot) { CallbackRecord record = mCallbacks.get(callingPid); if (record == null) { throw new IllegalStateException("The calling process has not " + "registered an IDisplayManagerCallback."); } startWifiDisplayScanLocked(record); } } private void startWifiDisplayScanLocked(CallbackRecord record) { if (!record.mWifiDisplayScanRequested) { record.mWifiDisplayScanRequested = true; if (mWifiDisplayScanRequestCount++ == 0) { if (mWifiDisplayAdapter != null) { mWifiDisplayAdapter.requestStartScanLocked(); } } } } private void stopWifiDisplayScanInternal(int callingPid) { synchronized (mSyncRoot) { CallbackRecord record = mCallbacks.get(callingPid); if (record == null) { throw new IllegalStateException("The calling process has not " + "registered an IDisplayManagerCallback."); } stopWifiDisplayScanLocked(record); } } private void stopWifiDisplayScanLocked(CallbackRecord record) { if (record.mWifiDisplayScanRequested) { record.mWifiDisplayScanRequested = false; if (--mWifiDisplayScanRequestCount == 0) { if (mWifiDisplayAdapter != null) { mWifiDisplayAdapter.requestStopScanLocked(); } } else if (mWifiDisplayScanRequestCount < 0) { Slog.wtf(TAG, "mWifiDisplayScanRequestCount became negative: " + mWifiDisplayScanRequestCount); mWifiDisplayScanRequestCount = 0; } } } private void connectWifiDisplayInternal(String address) { synchronized (mSyncRoot) { if (mWifiDisplayAdapter != null) { mWifiDisplayAdapter.requestConnectLocked(address); } } } private void pauseWifiDisplayInternal() { synchronized (mSyncRoot) { if (mWifiDisplayAdapter != null) { mWifiDisplayAdapter.requestPauseLocked(); } } } private void resumeWifiDisplayInternal() { synchronized (mSyncRoot) { if (mWifiDisplayAdapter != null) { mWifiDisplayAdapter.requestResumeLocked(); } } } private void disconnectWifiDisplayInternal() { synchronized (mSyncRoot) { if (mWifiDisplayAdapter != null) { mWifiDisplayAdapter.requestDisconnectLocked(); } } } private void renameWifiDisplayInternal(String address, String alias) { synchronized (mSyncRoot) { if (mWifiDisplayAdapter != null) { mWifiDisplayAdapter.requestRenameLocked(address, alias); } } } private void forgetWifiDisplayInternal(String address) { synchronized (mSyncRoot) { if (mWifiDisplayAdapter != null) { mWifiDisplayAdapter.requestForgetLocked(address); } } } private WifiDisplayStatus getWifiDisplayStatusInternal() { synchronized (mSyncRoot) { if (mWifiDisplayAdapter != null) { return mWifiDisplayAdapter.getWifiDisplayStatusLocked(); } return new WifiDisplayStatus(); } } private int createVirtualDisplayInternal(IVirtualDisplayCallback callback, IMediaProjection projection, int callingUid, String packageName, String name, int width, int height, int densityDpi, Surface surface, int flags) { synchronized (mSyncRoot) { if (mVirtualDisplayAdapter == null) { Slog.w(TAG, "Rejecting request to create private virtual display " + "because the virtual display adapter is not available."); return -1; } DisplayDevice device = mVirtualDisplayAdapter.createVirtualDisplayLocked( callback, projection, callingUid, packageName, name, width, height, densityDpi, surface, flags); if (device == null) { return -1; } handleDisplayDeviceAddedLocked(device); LogicalDisplay display = findLogicalDisplayForDeviceLocked(device); if (display != null) { return display.getDisplayIdLocked(); } // Something weird happened and the logical display was not created. Slog.w(TAG, "Rejecting request to create virtual display " + "because the logical display was not created."); mVirtualDisplayAdapter.releaseVirtualDisplayLocked(callback.asBinder()); handleDisplayDeviceRemovedLocked(device); } return -1; } private void resizeVirtualDisplayInternal(IBinder appToken, int width, int height, int densityDpi) { synchronized (mSyncRoot) { if (mVirtualDisplayAdapter == null) { return; } mVirtualDisplayAdapter.resizeVirtualDisplayLocked(appToken, width, height, densityDpi); } } private void setVirtualDisplaySurfaceInternal(IBinder appToken, Surface surface) { synchronized (mSyncRoot) { if (mVirtualDisplayAdapter == null) { return; } mVirtualDisplayAdapter.setVirtualDisplaySurfaceLocked(appToken, surface); } } private void releaseVirtualDisplayInternal(IBinder appToken) { synchronized (mSyncRoot) { if (mVirtualDisplayAdapter == null) { return; } DisplayDevice device = mVirtualDisplayAdapter.releaseVirtualDisplayLocked(appToken); if (device != null) { handleDisplayDeviceRemovedLocked(device); } } } private void registerDefaultDisplayAdapter() { // Register default display adapter. synchronized (mSyncRoot) { registerDisplayAdapterLocked(new LocalDisplayAdapter( mSyncRoot, mContext, mHandler, mDisplayAdapterListener)); } } private void registerAdditionalDisplayAdapters() { synchronized (mSyncRoot) { if (shouldRegisterNonEssentialDisplayAdaptersLocked()) { registerOverlayDisplayAdapterLocked(); registerWifiDisplayAdapterLocked(); registerVirtualDisplayAdapterLocked(); } } } private void registerOverlayDisplayAdapterLocked() { registerDisplayAdapterLocked(new OverlayDisplayAdapter( mSyncRoot, mContext, mHandler, mDisplayAdapterListener, mUiHandler)); } private void registerWifiDisplayAdapterLocked() { if (mContext.getResources().getBoolean( com.android.internal.R.bool.config_enableWifiDisplay) || SystemProperties.getInt(FORCE_WIFI_DISPLAY_ENABLE, -1) == 1) { mWifiDisplayAdapter = new WifiDisplayAdapter( mSyncRoot, mContext, mHandler, mDisplayAdapterListener, mPersistentDataStore); registerDisplayAdapterLocked(mWifiDisplayAdapter); } } private void registerVirtualDisplayAdapterLocked() { mVirtualDisplayAdapter = new VirtualDisplayAdapter( mSyncRoot, mContext, mHandler, mDisplayAdapterListener); registerDisplayAdapterLocked(mVirtualDisplayAdapter); } private boolean shouldRegisterNonEssentialDisplayAdaptersLocked() { // In safe mode, we disable non-essential display adapters to give the user // an opportunity to fix broken settings or other problems that might affect // system stability. // In only-core mode, we disable non-essential display adapters to minimize // the number of dependencies that are started while in this mode and to // prevent problems that might occur due to the device being encrypted. return !mSafeMode && !mOnlyCore; } private void registerDisplayAdapterLocked(DisplayAdapter adapter) { mDisplayAdapters.add(adapter); adapter.registerLocked(); } private void handleDisplayDeviceAdded(DisplayDevice device) { synchronized (mSyncRoot) { handleDisplayDeviceAddedLocked(device); } } private void handleDisplayDeviceAddedLocked(DisplayDevice device) { DisplayDeviceInfo info = device.getDisplayDeviceInfoLocked(); if (mDisplayDevices.contains(device)) { Slog.w(TAG, "Attempted to add already added display device: " + info); return; } Slog.i(TAG, "Display device added: " + info); device.mDebugLastLoggedDeviceInfo = info; mDisplayDevices.add(device); addLogicalDisplayLocked(device); Runnable work = updateDisplayStateLocked(device); if (work != null) { work.run(); } scheduleTraversalLocked(false); } private void handleDisplayDeviceChanged(DisplayDevice device) { synchronized (mSyncRoot) { DisplayDeviceInfo info = device.getDisplayDeviceInfoLocked(); if (!mDisplayDevices.contains(device)) { Slog.w(TAG, "Attempted to change non-existent display device: " + info); return; } int diff = device.mDebugLastLoggedDeviceInfo.diff(info); if (diff == DisplayDeviceInfo.DIFF_STATE) { Slog.i(TAG, "Display device changed state: \"" + info.name + "\", " + Display.stateToString(info.state)); } else if (diff != 0) { Slog.i(TAG, "Display device changed: " + info); } device.mDebugLastLoggedDeviceInfo = info; device.applyPendingDisplayDeviceInfoChangesLocked(); if (updateLogicalDisplaysLocked()) { scheduleTraversalLocked(false); } } } private void handleDisplayDeviceRemoved(DisplayDevice device) { synchronized (mSyncRoot) { handleDisplayDeviceRemovedLocked(device); } } private void handleDisplayDeviceRemovedLocked(DisplayDevice device) { DisplayDeviceInfo info = device.getDisplayDeviceInfoLocked(); if (!mDisplayDevices.remove(device)) { Slog.w(TAG, "Attempted to remove non-existent display device: " + info); return; } Slog.i(TAG, "Display device removed: " + info); device.mDebugLastLoggedDeviceInfo = info; updateLogicalDisplaysLocked(); scheduleTraversalLocked(false); } private void applyGlobalDisplayStateLocked(List<Runnable> workQueue) { final int count = mDisplayDevices.size(); for (int i = 0; i < count; i++) { DisplayDevice device = mDisplayDevices.get(i); Runnable runnable = updateDisplayStateLocked(device); if (runnable != null) { workQueue.add(runnable); } } } private Runnable updateDisplayStateLocked(DisplayDevice device) { // Blank or unblank the display immediately to match the state requested // by the display power controller (if known). DisplayDeviceInfo info = device.getDisplayDeviceInfoLocked(); if ((info.flags & DisplayDeviceInfo.FLAG_NEVER_BLANK) == 0) { return device.requestDisplayStateLocked(mGlobalDisplayState, mGlobalDisplayBrightness); } return null; } // Adds a new logical display based on the given display device. // Sends notifications if needed. private void addLogicalDisplayLocked(DisplayDevice device) { DisplayDeviceInfo deviceInfo = device.getDisplayDeviceInfoLocked(); boolean isDefault = (deviceInfo.flags & DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY) != 0; if (isDefault && mLogicalDisplays.get(Display.DEFAULT_DISPLAY) != null) { Slog.w(TAG, "Ignoring attempt to add a second default display: " + deviceInfo); isDefault = false; } if (!isDefault && mSingleDisplayDemoMode) { Slog.i(TAG, "Not creating a logical display for a secondary display " + " because single display demo mode is enabled: " + deviceInfo); return; } final int displayId = assignDisplayIdLocked(isDefault); final int layerStack = assignLayerStackLocked(displayId); LogicalDisplay display = new LogicalDisplay(displayId, layerStack, device); display.updateLocked(mDisplayDevices); if (!display.isValidLocked()) { // This should never happen currently. Slog.w(TAG, "Ignoring display device because the logical display " + "created from it was not considered valid: " + deviceInfo); return; } mLogicalDisplays.put(displayId, display); // Wake up waitForDefaultDisplay. if (isDefault) { mSyncRoot.notifyAll(); } sendDisplayEventLocked(displayId, DisplayManagerGlobal.EVENT_DISPLAY_ADDED); } private int assignDisplayIdLocked(boolean isDefault) { return isDefault ? Display.DEFAULT_DISPLAY : mNextNonDefaultDisplayId++; } private int assignLayerStackLocked(int displayId) { // Currently layer stacks and display ids are the same. // This need not be the case. return displayId; } // Updates all existing logical displays given the current set of display devices. // Removes invalid logical displays. // Sends notifications if needed. private boolean updateLogicalDisplaysLocked() { boolean changed = false; for (int i = mLogicalDisplays.size(); i-- > 0; ) { final int displayId = mLogicalDisplays.keyAt(i); LogicalDisplay display = mLogicalDisplays.valueAt(i); mTempDisplayInfo.copyFrom(display.getDisplayInfoLocked()); display.updateLocked(mDisplayDevices); if (!display.isValidLocked()) { mLogicalDisplays.removeAt(i); sendDisplayEventLocked(displayId, DisplayManagerGlobal.EVENT_DISPLAY_REMOVED); changed = true; } else if (!mTempDisplayInfo.equals(display.getDisplayInfoLocked())) { sendDisplayEventLocked(displayId, DisplayManagerGlobal.EVENT_DISPLAY_CHANGED); changed = true; } } return changed; } private void performTraversalInTransactionLocked() { // Clear all viewports before configuring displays so that we can keep // track of which ones we have configured. clearViewportsLocked(); // Configure each display device. final int count = mDisplayDevices.size(); for (int i = 0; i < count; i++) { DisplayDevice device = mDisplayDevices.get(i); configureDisplayInTransactionLocked(device); device.performTraversalInTransactionLocked(); } // Tell the input system about these new viewports. if (mInputManagerInternal != null) { mHandler.sendEmptyMessage(MSG_UPDATE_VIEWPORT); } } private void setDisplayPropertiesInternal(int displayId, boolean hasContent, float requestedRefreshRate, int requestedModeId, boolean inTraversal) { synchronized (mSyncRoot) { LogicalDisplay display = mLogicalDisplays.get(displayId); if (display == null) { return; } if (display.hasContentLocked() != hasContent) { if (DEBUG) { Slog.d(TAG, "Display " + displayId + " hasContent flag changed: " + "hasContent=" + hasContent + ", inTraversal=" + inTraversal); } display.setHasContentLocked(hasContent); scheduleTraversalLocked(inTraversal); } if (requestedModeId == 0 && requestedRefreshRate != 0) { // Scan supported modes returned by display.getInfo() to find a mode with the same // size as the default display mode but with the specified refresh rate instead. requestedModeId = display.getDisplayInfoLocked().findDefaultModeByRefreshRate( requestedRefreshRate); } if (display.getRequestedModeIdLocked() != requestedModeId) { if (DEBUG) { Slog.d(TAG, "Display " + displayId + " switching to mode " + requestedModeId); } display.setRequestedModeIdLocked(requestedModeId); scheduleTraversalLocked(inTraversal); } } } private void setDisplayOffsetsInternal(int displayId, int x, int y) { synchronized (mSyncRoot) { LogicalDisplay display = mLogicalDisplays.get(displayId); if (display == null) { return; } if (display.getDisplayOffsetXLocked() != x || display.getDisplayOffsetYLocked() != y) { if (DEBUG) { Slog.d(TAG, "Display " + displayId + " burn-in offset set to (" + x + ", " + y + ")"); } display.setDisplayOffsetsLocked(x, y); scheduleTraversalLocked(false); } } } private void clearViewportsLocked() { mDefaultViewport.valid = false; mExternalTouchViewport.valid = false; } private void configureDisplayInTransactionLocked(DisplayDevice device) { final DisplayDeviceInfo info = device.getDisplayDeviceInfoLocked(); final boolean ownContent = (info.flags & DisplayDeviceInfo.FLAG_OWN_CONTENT_ONLY) != 0; // Find the logical display that the display device is showing. // Certain displays only ever show their own content. LogicalDisplay display = findLogicalDisplayForDeviceLocked(device); if (!ownContent) { if (display != null && !display.hasContentLocked()) { // If the display does not have any content of its own, then // automatically mirror the default logical display contents. display = null; } if (display == null) { display = mLogicalDisplays.get(Display.DEFAULT_DISPLAY); } } // Apply the logical display configuration to the display device. if (display == null) { // TODO: no logical display for the device, blank it Slog.w(TAG, "Missing logical display to use for physical display device: " + device.getDisplayDeviceInfoLocked()); return; } display.configureDisplayInTransactionLocked(device, info.state == Display.STATE_OFF); // Update the viewports if needed. if (!mDefaultViewport.valid && (info.flags & DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY) != 0) { setViewportLocked(mDefaultViewport, display, device); } if (!mExternalTouchViewport.valid && info.touch == DisplayDeviceInfo.TOUCH_EXTERNAL) { setViewportLocked(mExternalTouchViewport, display, device); } } private static void setViewportLocked(DisplayViewport viewport, LogicalDisplay display, DisplayDevice device) { viewport.valid = true; viewport.displayId = display.getDisplayIdLocked(); device.populateViewportLocked(viewport); } private LogicalDisplay findLogicalDisplayForDeviceLocked(DisplayDevice device) { final int count = mLogicalDisplays.size(); for (int i = 0; i < count; i++) { LogicalDisplay display = mLogicalDisplays.valueAt(i); if (display.getPrimaryDisplayDeviceLocked() == device) { return display; } } return null; } private void sendDisplayEventLocked(int displayId, int event) { Message msg = mHandler.obtainMessage(MSG_DELIVER_DISPLAY_EVENT, displayId, event); mHandler.sendMessage(msg); } // Requests that performTraversalsInTransactionFromWindowManager be called at a // later time to apply changes to surfaces and displays. private void scheduleTraversalLocked(boolean inTraversal) { if (!mPendingTraversal && mWindowManagerInternal != null) { mPendingTraversal = true; if (!inTraversal) { mHandler.sendEmptyMessage(MSG_REQUEST_TRAVERSAL); } } } // Runs on Handler thread. // Delivers display event notifications to callbacks. private void deliverDisplayEvent(int displayId, int event) { if (DEBUG) { Slog.d(TAG, "Delivering display event: displayId=" + displayId + ", event=" + event); } // Grab the lock and copy the callbacks. final int count; synchronized (mSyncRoot) { count = mCallbacks.size(); mTempCallbacks.clear(); for (int i = 0; i < count; i++) { mTempCallbacks.add(mCallbacks.valueAt(i)); } } // After releasing the lock, send the notifications out. for (int i = 0; i < count; i++) { mTempCallbacks.get(i).notifyDisplayEventAsync(displayId, event); } mTempCallbacks.clear(); } private IMediaProjectionManager getProjectionService() { if (mProjectionService == null) { IBinder b = ServiceManager.getService(Context.MEDIA_PROJECTION_SERVICE); mProjectionService = IMediaProjectionManager.Stub.asInterface(b); } return mProjectionService; } private void dumpInternal(PrintWriter pw) { pw.println("DISPLAY MANAGER (dumpsys display)"); synchronized (mSyncRoot) { pw.println(" mOnlyCode=" + mOnlyCore); pw.println(" mSafeMode=" + mSafeMode); pw.println(" mPendingTraversal=" + mPendingTraversal); pw.println(" mGlobalDisplayState=" + Display.stateToString(mGlobalDisplayState)); pw.println(" mNextNonDefaultDisplayId=" + mNextNonDefaultDisplayId); pw.println(" mDefaultViewport=" + mDefaultViewport); pw.println(" mExternalTouchViewport=" + mExternalTouchViewport); pw.println(" mSingleDisplayDemoMode=" + mSingleDisplayDemoMode); pw.println(" mWifiDisplayScanRequestCount=" + mWifiDisplayScanRequestCount); IndentingPrintWriter ipw = new IndentingPrintWriter(pw, " "); ipw.increaseIndent(); pw.println(); pw.println("Display Adapters: size=" + mDisplayAdapters.size()); for (DisplayAdapter adapter : mDisplayAdapters) { pw.println(" " + adapter.getName()); adapter.dumpLocked(ipw); } pw.println(); pw.println("Display Devices: size=" + mDisplayDevices.size()); for (DisplayDevice device : mDisplayDevices) { pw.println(" " + device.getDisplayDeviceInfoLocked()); device.dumpLocked(ipw); } final int logicalDisplayCount = mLogicalDisplays.size(); pw.println(); pw.println("Logical Displays: size=" + logicalDisplayCount); for (int i = 0; i < logicalDisplayCount; i++) { int displayId = mLogicalDisplays.keyAt(i); LogicalDisplay display = mLogicalDisplays.valueAt(i); pw.println(" Display " + displayId + ":"); display.dumpLocked(ipw); } final int callbackCount = mCallbacks.size(); pw.println(); pw.println("Callbacks: size=" + callbackCount); for (int i = 0; i < callbackCount; i++) { CallbackRecord callback = mCallbacks.valueAt(i); pw.println(" " + i + ": mPid=" + callback.mPid + ", mWifiDisplayScanRequested=" + callback.mWifiDisplayScanRequested); } if (mDisplayPowerController != null) { mDisplayPowerController.dump(pw); } } } /** * This is the object that everything in the display manager locks on. * We make it an inner class within the {@link DisplayManagerService} to so that it is * clear that the object belongs to the display manager service and that it is * a unique object with a special purpose. */ public static final class SyncRoot { } private final class DisplayManagerHandler extends Handler { public DisplayManagerHandler(Looper looper) { super(looper, null, true /*async*/); } @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_REGISTER_DEFAULT_DISPLAY_ADAPTER: registerDefaultDisplayAdapter(); break; case MSG_REGISTER_ADDITIONAL_DISPLAY_ADAPTERS: registerAdditionalDisplayAdapters(); break; case MSG_DELIVER_DISPLAY_EVENT: deliverDisplayEvent(msg.arg1, msg.arg2); break; case MSG_REQUEST_TRAVERSAL: mWindowManagerInternal.requestTraversalFromDisplayManager(); break; case MSG_UPDATE_VIEWPORT: { synchronized (mSyncRoot) { mTempDefaultViewport.copyFrom(mDefaultViewport); mTempExternalTouchViewport.copyFrom(mExternalTouchViewport); } mInputManagerInternal.setDisplayViewports( mTempDefaultViewport, mTempExternalTouchViewport); break; } } } } private final class DisplayAdapterListener implements DisplayAdapter.Listener { @Override public void onDisplayDeviceEvent(DisplayDevice device, int event) { switch (event) { case DisplayAdapter.DISPLAY_DEVICE_EVENT_ADDED: handleDisplayDeviceAdded(device); break; case DisplayAdapter.DISPLAY_DEVICE_EVENT_CHANGED: handleDisplayDeviceChanged(device); break; case DisplayAdapter.DISPLAY_DEVICE_EVENT_REMOVED: handleDisplayDeviceRemoved(device); break; } } @Override public void onTraversalRequested() { synchronized (mSyncRoot) { scheduleTraversalLocked(false); } } } private final class CallbackRecord implements DeathRecipient { public final int mPid; private final IDisplayManagerCallback mCallback; public boolean mWifiDisplayScanRequested; public CallbackRecord(int pid, IDisplayManagerCallback callback) { mPid = pid; mCallback = callback; } @Override public void binderDied() { if (DEBUG) { Slog.d(TAG, "Display listener for pid " + mPid + " died."); } onCallbackDied(this); } public void notifyDisplayEventAsync(int displayId, int event) { try { mCallback.onDisplayEvent(displayId, event); } catch (RemoteException ex) { Slog.w(TAG, "Failed to notify process " + mPid + " that displays changed, assuming it died.", ex); binderDied(); } } } private final class BinderService extends IDisplayManager.Stub { /** * Returns information about the specified logical display. * * @param displayId The logical display id. * @return The logical display info, or null if the display does not exist. The * returned object must be treated as immutable. */ @Override // Binder call public DisplayInfo getDisplayInfo(int displayId) { final int callingUid = Binder.getCallingUid(); final long token = Binder.clearCallingIdentity(); try { return getDisplayInfoInternal(displayId, callingUid); } finally { Binder.restoreCallingIdentity(token); } } /** * Returns the list of all display ids. */ @Override // Binder call public int[] getDisplayIds() { final int callingUid = Binder.getCallingUid(); final long token = Binder.clearCallingIdentity(); try { return getDisplayIdsInternal(callingUid); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void registerCallback(IDisplayManagerCallback callback) { if (callback == null) { throw new IllegalArgumentException("listener must not be null"); } final int callingPid = Binder.getCallingPid(); final long token = Binder.clearCallingIdentity(); try { registerCallbackInternal(callback, callingPid); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void startWifiDisplayScan() { mContext.enforceCallingOrSelfPermission(Manifest.permission.CONFIGURE_WIFI_DISPLAY, "Permission required to start wifi display scans"); final int callingPid = Binder.getCallingPid(); final long token = Binder.clearCallingIdentity(); try { startWifiDisplayScanInternal(callingPid); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void stopWifiDisplayScan() { mContext.enforceCallingOrSelfPermission(Manifest.permission.CONFIGURE_WIFI_DISPLAY, "Permission required to stop wifi display scans"); final int callingPid = Binder.getCallingPid(); final long token = Binder.clearCallingIdentity(); try { stopWifiDisplayScanInternal(callingPid); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void connectWifiDisplay(String address) { if (address == null) { throw new IllegalArgumentException("address must not be null"); } mContext.enforceCallingOrSelfPermission(Manifest.permission.CONFIGURE_WIFI_DISPLAY, "Permission required to connect to a wifi display"); final long token = Binder.clearCallingIdentity(); try { connectWifiDisplayInternal(address); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void disconnectWifiDisplay() { // This request does not require special permissions. // Any app can request disconnection from the currently active wifi display. // This exception should no longer be needed once wifi display control moves // to the media router service. final long token = Binder.clearCallingIdentity(); try { disconnectWifiDisplayInternal(); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void renameWifiDisplay(String address, String alias) { if (address == null) { throw new IllegalArgumentException("address must not be null"); } mContext.enforceCallingOrSelfPermission(Manifest.permission.CONFIGURE_WIFI_DISPLAY, "Permission required to rename to a wifi display"); final long token = Binder.clearCallingIdentity(); try { renameWifiDisplayInternal(address, alias); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void forgetWifiDisplay(String address) { if (address == null) { throw new IllegalArgumentException("address must not be null"); } mContext.enforceCallingOrSelfPermission(Manifest.permission.CONFIGURE_WIFI_DISPLAY, "Permission required to forget to a wifi display"); final long token = Binder.clearCallingIdentity(); try { forgetWifiDisplayInternal(address); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void pauseWifiDisplay() { mContext.enforceCallingOrSelfPermission(Manifest.permission.CONFIGURE_WIFI_DISPLAY, "Permission required to pause a wifi display session"); final long token = Binder.clearCallingIdentity(); try { pauseWifiDisplayInternal(); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void resumeWifiDisplay() { mContext.enforceCallingOrSelfPermission(Manifest.permission.CONFIGURE_WIFI_DISPLAY, "Permission required to resume a wifi display session"); final long token = Binder.clearCallingIdentity(); try { resumeWifiDisplayInternal(); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public WifiDisplayStatus getWifiDisplayStatus() { // This request does not require special permissions. // Any app can get information about available wifi displays. final long token = Binder.clearCallingIdentity(); try { return getWifiDisplayStatusInternal(); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public int createVirtualDisplay(IVirtualDisplayCallback callback, IMediaProjection projection, String packageName, String name, int width, int height, int densityDpi, Surface surface, int flags) { final int callingUid = Binder.getCallingUid(); if (!validatePackageName(callingUid, packageName)) { throw new SecurityException("packageName must match the calling uid"); } if (callback == null) { throw new IllegalArgumentException("appToken must not be null"); } if (TextUtils.isEmpty(name)) { throw new IllegalArgumentException("name must be non-null and non-empty"); } if (width <= 0 || height <= 0 || densityDpi <= 0) { throw new IllegalArgumentException("width, height, and densityDpi must be " + "greater than 0"); } if ((flags & DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC) != 0) { flags |= DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR; } if ((flags & DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY) != 0) { flags &= ~DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR; } if (projection != null) { try { if (!getProjectionService().isValidMediaProjection(projection)) { throw new SecurityException("Invalid media projection"); } flags = projection.applyVirtualDisplayFlags(flags); } catch (RemoteException e) { throw new SecurityException("unable to validate media projection or flags"); } } if (callingUid != Process.SYSTEM_UID && (flags & DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR) != 0) { if (!canProjectVideo(projection)) { throw new SecurityException("Requires CAPTURE_VIDEO_OUTPUT or " + "CAPTURE_SECURE_VIDEO_OUTPUT permission, or an appropriate " + "MediaProjection token in order to create a screen sharing virtual " + "display."); } } if ((flags & DisplayManager.VIRTUAL_DISPLAY_FLAG_SECURE) != 0) { if (!canProjectSecureVideo(projection)) { throw new SecurityException("Requires CAPTURE_SECURE_VIDEO_OUTPUT " + "or an appropriate MediaProjection token to create a " + "secure virtual display."); } } final long token = Binder.clearCallingIdentity(); try { return createVirtualDisplayInternal(callback, projection, callingUid, packageName, name, width, height, densityDpi, surface, flags); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void resizeVirtualDisplay(IVirtualDisplayCallback callback, int width, int height, int densityDpi) { final long token = Binder.clearCallingIdentity(); try { resizeVirtualDisplayInternal(callback.asBinder(), width, height, densityDpi); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void setVirtualDisplaySurface(IVirtualDisplayCallback callback, Surface surface) { final long token = Binder.clearCallingIdentity(); try { setVirtualDisplaySurfaceInternal(callback.asBinder(), surface); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void releaseVirtualDisplay(IVirtualDisplayCallback callback) { final long token = Binder.clearCallingIdentity(); try { releaseVirtualDisplayInternal(callback.asBinder()); } finally { Binder.restoreCallingIdentity(token); } } @Override // Binder call public void dump(FileDescriptor fd, final PrintWriter pw, String[] args) { if (mContext == null || mContext.checkCallingOrSelfPermission(Manifest.permission.DUMP) != PackageManager.PERMISSION_GRANTED) { pw.println("Permission Denial: can't dump DisplayManager from from pid=" + Binder.getCallingPid() + ", uid=" + Binder.getCallingUid()); return; } final long token = Binder.clearCallingIdentity(); try { dumpInternal(pw); } finally { Binder.restoreCallingIdentity(token); } } private boolean validatePackageName(int uid, String packageName) { if (packageName != null) { String[] packageNames = mContext.getPackageManager().getPackagesForUid(uid); if (packageNames != null) { for (String n : packageNames) { if (n.equals(packageName)) { return true; } } } } return false; } private boolean canProjectVideo(IMediaProjection projection) { if (projection != null) { try { if (projection.canProjectVideo()) { return true; } } catch (RemoteException e) { Slog.e(TAG, "Unable to query projection service for permissions", e); } } if (mContext.checkCallingPermission( android.Manifest.permission.CAPTURE_VIDEO_OUTPUT) == PackageManager.PERMISSION_GRANTED) { return true; } return canProjectSecureVideo(projection); } private boolean canProjectSecureVideo(IMediaProjection projection) { if (projection != null) { try { if (projection.canProjectSecureVideo()){ return true; } } catch (RemoteException e) { Slog.e(TAG, "Unable to query projection service for permissions", e); } } return mContext.checkCallingPermission( android.Manifest.permission.CAPTURE_SECURE_VIDEO_OUTPUT) == PackageManager.PERMISSION_GRANTED; } } private final class LocalService extends DisplayManagerInternal { @Override public void initPowerManagement(final DisplayPowerCallbacks callbacks, Handler handler, SensorManager sensorManager) { synchronized (mSyncRoot) { DisplayBlanker blanker = new DisplayBlanker() { @Override public void requestDisplayState(int state, int brightness) { // The order of operations is important for legacy reasons. if (state == Display.STATE_OFF) { requestGlobalDisplayStateInternal(state, brightness); } callbacks.onDisplayStateChange(state); if (state != Display.STATE_OFF) { requestGlobalDisplayStateInternal(state, brightness); } } }; mDisplayPowerController = new DisplayPowerController( mContext, callbacks, handler, sensorManager, blanker); } } @Override public boolean requestPowerState(DisplayPowerRequest request, boolean waitForNegativeProximity) { return mDisplayPowerController.requestPowerState(request, waitForNegativeProximity); } @Override public boolean isProximitySensorAvailable() { return mDisplayPowerController.isProximitySensorAvailable(); } @Override public DisplayInfo getDisplayInfo(int displayId) { return getDisplayInfoInternal(displayId, Process.myUid()); } @Override public void registerDisplayTransactionListener(DisplayTransactionListener listener) { if (listener == null) { throw new IllegalArgumentException("listener must not be null"); } registerDisplayTransactionListenerInternal(listener); } @Override public void unregisterDisplayTransactionListener(DisplayTransactionListener listener) { if (listener == null) { throw new IllegalArgumentException("listener must not be null"); } unregisterDisplayTransactionListenerInternal(listener); } @Override public void setDisplayInfoOverrideFromWindowManager(int displayId, DisplayInfo info) { setDisplayInfoOverrideFromWindowManagerInternal(displayId, info); } @Override public void performTraversalInTransactionFromWindowManager() { performTraversalInTransactionFromWindowManagerInternal(); } @Override public void setDisplayProperties(int displayId, boolean hasContent, float requestedRefreshRate, int requestedMode, boolean inTraversal) { setDisplayPropertiesInternal(displayId, hasContent, requestedRefreshRate, requestedMode, inTraversal); } @Override public void setDisplayOffsets(int displayId, int x, int y) { setDisplayOffsetsInternal(displayId, x, y); } } }