1 files changed, 161 insertions, 0 deletions
diff --git a/services/java/com/android/server/display/VirtualDisplayAdapter.java b/services/java/com/android/server/display/VirtualDisplayAdapter.java
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+++ b/services/java/com/android/server/display/VirtualDisplayAdapter.java
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+/*
+ * Copyright (C) 2013 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 android.content.Context;
+import android.os.Handler;
+import android.os.IBinder;
+import android.os.IBinder.DeathRecipient;
+import android.os.RemoteException;
+import android.util.ArrayMap;
+import android.util.Slog;
+import android.view.Display;
+import android.view.Surface;
+import android.view.SurfaceControl;
+
+/**
+ * A display adapter that provides virtual displays on behalf of applications.
+ * <p>
+ * Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
+ * </p>
+ */
+final class VirtualDisplayAdapter extends DisplayAdapter {
+    static final String TAG = "VirtualDisplayAdapter";
+    static final boolean DEBUG = false;
+
+    private final ArrayMap<IBinder, VirtualDisplayDevice> mVirtualDisplayDevices =
+            new ArrayMap<IBinder, VirtualDisplayDevice>();
+
+    // Called with SyncRoot lock held.
+    public VirtualDisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
+            Context context, Handler handler, Listener listener) {
+        super(syncRoot, context, handler, listener, TAG);
+    }
+
+    public DisplayDevice createPrivateVirtualDisplayLocked(IBinder appToken,
+            int ownerUid, String ownerPackageName,
+            String name, int width, int height, int densityDpi, Surface surface) {
+        IBinder displayToken = SurfaceControl.createDisplay(name, false /*secure*/);
+        VirtualDisplayDevice device = new VirtualDisplayDevice(displayToken, appToken,
+                ownerUid, ownerPackageName, name, width, height, densityDpi, surface);
+
+        try {
+            appToken.linkToDeath(device, 0);
+        } catch (RemoteException ex) {
+            device.releaseLocked();
+            return null;
+        }
+
+        mVirtualDisplayDevices.put(appToken, device);
+
+        // Return the display device without actually sending the event indicating
+        // that it was added.  The caller will handle it.
+        return device;
+    }
+
+    public DisplayDevice releaseVirtualDisplayLocked(IBinder appToken) {
+        VirtualDisplayDevice device = mVirtualDisplayDevices.remove(appToken);
+        if (device != null) {
+            appToken.unlinkToDeath(device, 0);
+        }
+
+        // Return the display device that was removed without actually sending the
+        // event indicating that it was removed.  The caller will handle it.
+        return device;
+    }
+
+    private void handleBinderDiedLocked(IBinder appToken) {
+        VirtualDisplayDevice device = mVirtualDisplayDevices.remove(appToken);
+        if (device != null) {
+            Slog.i(TAG, "Virtual display device released because application token died: "
+                    + device.mOwnerPackageName);
+            sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_REMOVED);
+        }
+    }
+
+    private final class VirtualDisplayDevice extends DisplayDevice
+            implements DeathRecipient {
+        private final IBinder mAppToken;
+        private final int mOwnerUid;
+        final String mOwnerPackageName;
+        private final String mName;
+        private final int mWidth;
+        private final int mHeight;
+        private final int mDensityDpi;
+
+        private boolean mReleased;
+        private Surface mSurface;
+        private DisplayDeviceInfo mInfo;
+
+        public VirtualDisplayDevice(IBinder displayToken,
+                IBinder appToken, int ownerUid, String ownerPackageName,
+                String name, int width, int height, int densityDpi, Surface surface) {
+            super(VirtualDisplayAdapter.this, displayToken);
+            mAppToken = appToken;
+            mOwnerUid = ownerUid;
+            mOwnerPackageName = ownerPackageName;
+            mName = name;
+            mWidth = width;
+            mHeight = height;
+            mDensityDpi = densityDpi;
+            mSurface = surface;
+        }
+
+        @Override
+        public void binderDied() {
+            synchronized (getSyncRoot()) {
+                if (!mReleased) {
+                    handleBinderDiedLocked(mAppToken);
+                }
+            }
+        }
+
+        public void releaseLocked() {
+            mReleased = true;
+            sendTraversalRequestLocked();
+        }
+
+        @Override
+        public void performTraversalInTransactionLocked() {
+            if (mReleased && mSurface != null) {
+                mSurface.destroy();
+                mSurface = null;
+            }
+            setSurfaceInTransactionLocked(mSurface);
+        }
+
+        @Override
+        public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
+            if (mInfo == null) {
+                mInfo = new DisplayDeviceInfo();
+                mInfo.name = mName;
+                mInfo.width = mWidth;
+                mInfo.height = mHeight;
+                mInfo.refreshRate = 60;
+                mInfo.densityDpi = mDensityDpi;
+                mInfo.xDpi = mDensityDpi;
+                mInfo.yDpi = mDensityDpi;
+                mInfo.flags = DisplayDeviceInfo.FLAG_PRIVATE | DisplayDeviceInfo.FLAG_NEVER_BLANK;
+                mInfo.type = Display.TYPE_VIRTUAL;
+                mInfo.touch = DisplayDeviceInfo.TOUCH_NONE;
+                mInfo.ownerUid = mOwnerUid;
+                mInfo.ownerPackageName = mOwnerPackageName;
+            }
+            return mInfo;
+        }
+    }
+}