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1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.server.wm;
18
19
20import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_SURFACE_TRACE;
21import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
22import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
23
24import android.content.Context;
25import android.graphics.Canvas;
26import android.graphics.Color;
27import android.graphics.PixelFormat;
28import android.graphics.Point;
29import android.graphics.PorterDuff;
30import android.graphics.Rect;
31import android.graphics.drawable.Drawable;
32import android.view.Display;
33import android.view.Surface;
34import android.view.Surface.OutOfResourcesException;
35import android.view.SurfaceControl;
36import android.view.SurfaceSession;
37
38class EmulatorDisplayOverlay {
39    private static final String TAG = TAG_WITH_CLASS_NAME ? "EmulatorDisplayOverlay" : TAG_WM;
40
41    // Display dimensions
42    private Point mScreenSize;
43
44    private final SurfaceControl mSurfaceControl;
45    private final Surface mSurface = new Surface();
46    private int mLastDW;
47    private int mLastDH;
48    private boolean mDrawNeeded;
49    private Drawable mOverlay;
50    private int mRotation;
51    private boolean mVisible;
52
53    public EmulatorDisplayOverlay(Context context, Display display, SurfaceSession session,
54            int zOrder) {
55        mScreenSize = new Point();
56        display.getSize(mScreenSize);
57
58        SurfaceControl ctrl = null;
59        try {
60            if (DEBUG_SURFACE_TRACE) {
61                ctrl = new WindowSurfaceController.SurfaceTrace(session, "EmulatorDisplayOverlay",
62                        mScreenSize.x, mScreenSize.y, PixelFormat.TRANSLUCENT,
63                        SurfaceControl.HIDDEN);
64            } else {
65                ctrl = new SurfaceControl(session, "EmulatorDisplayOverlay", mScreenSize.x,
66                        mScreenSize.y, PixelFormat.TRANSLUCENT, SurfaceControl.HIDDEN);
67            }
68            ctrl.setLayerStack(display.getLayerStack());
69            ctrl.setLayer(zOrder);
70            ctrl.setPosition(0, 0);
71            ctrl.show();
72            mSurface.copyFrom(ctrl);
73        } catch (OutOfResourcesException e) {
74        }
75        mSurfaceControl = ctrl;
76        mDrawNeeded = true;
77        mOverlay = context.getDrawable(
78                com.android.internal.R.drawable.emulator_circular_window_overlay);
79    }
80
81    private void drawIfNeeded() {
82        if (!mDrawNeeded || !mVisible) {
83            return;
84        }
85        mDrawNeeded = false;
86
87        Rect dirty = new Rect(0, 0, mScreenSize.x, mScreenSize.y);
88        Canvas c = null;
89        try {
90            c = mSurface.lockCanvas(dirty);
91        } catch (IllegalArgumentException e) {
92        } catch (OutOfResourcesException e) {
93        }
94        if (c == null) {
95            return;
96        }
97        c.drawColor(Color.TRANSPARENT, PorterDuff.Mode.SRC);
98        mSurfaceControl.setPosition(0, 0);
99        // Always draw the overlay with square dimensions
100        int size = Math.max(mScreenSize.x, mScreenSize.y);
101        mOverlay.setBounds(0, 0, size, size);
102        mOverlay.draw(c);
103        mSurface.unlockCanvasAndPost(c);
104    }
105
106    // Note: caller responsible for being inside
107    // Surface.openTransaction() / closeTransaction()
108    public void setVisibility(boolean on) {
109        if (mSurfaceControl == null) {
110            return;
111        }
112        mVisible = on;
113        drawIfNeeded();
114        if (on) {
115            mSurfaceControl.show();
116        } else {
117            mSurfaceControl.hide();
118        }
119    }
120
121    void positionSurface(int dw, int dh, int rotation) {
122        if (mLastDW == dw && mLastDH == dh && mRotation == rotation) {
123            return;
124        }
125        mLastDW = dw;
126        mLastDH = dh;
127        mDrawNeeded = true;
128        mRotation = rotation;
129        drawIfNeeded();
130    }
131
132}
133