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 android.content.Context;
21import android.graphics.Canvas;
22import android.graphics.Color;
23import android.graphics.PixelFormat;
24import android.graphics.Point;
25import android.graphics.PorterDuff;
26import android.graphics.Rect;
27import android.graphics.drawable.Drawable;
28import android.util.Slog;
29import android.view.Display;
30import android.view.Surface;
31import android.view.Surface.OutOfResourcesException;
32import android.view.SurfaceControl;
33import android.view.SurfaceSession;
34
35class EmulatorDisplayOverlay {
36    private static final String TAG = "EmulatorDisplayOverlay";
37
38    // Display dimensions
39    private Point mScreenSize;
40
41    private final SurfaceControl mSurfaceControl;
42    private final Surface mSurface = new Surface();
43    private int mLastDW;
44    private int mLastDH;
45    private boolean mDrawNeeded;
46    private Drawable mOverlay;
47    private int mRotation;
48    private boolean mVisible;
49
50    public EmulatorDisplayOverlay(Context context, Display display, SurfaceSession session,
51            int zOrder) {
52        mScreenSize = new Point();
53        display.getSize(mScreenSize);
54
55        SurfaceControl ctrl = null;
56        try {
57            if (WindowManagerService.DEBUG_SURFACE_TRACE) {
58                ctrl = new WindowStateAnimator.SurfaceTrace(session, "EmulatorDisplayOverlay",
59                        mScreenSize.x, mScreenSize.y, PixelFormat.TRANSLUCENT,
60                        SurfaceControl.HIDDEN);
61            } else {
62                ctrl = new SurfaceControl(session, "EmulatorDisplayOverlay", mScreenSize.x,
63                        mScreenSize.y, PixelFormat.TRANSLUCENT, SurfaceControl.HIDDEN);
64            }
65            ctrl.setLayerStack(display.getLayerStack());
66            ctrl.setLayer(zOrder);
67            ctrl.setPosition(0, 0);
68            ctrl.show();
69            mSurface.copyFrom(ctrl);
70        } catch (OutOfResourcesException e) {
71        }
72        mSurfaceControl = ctrl;
73        mDrawNeeded = true;
74        mOverlay = context.getDrawable(
75                com.android.internal.R.drawable.emulator_circular_window_overlay);
76    }
77
78    private void drawIfNeeded() {
79        if (!mDrawNeeded || !mVisible) {
80            return;
81        }
82        mDrawNeeded = false;
83
84        Rect dirty = new Rect(0, 0, mScreenSize.x, mScreenSize.y);
85        Canvas c = null;
86        try {
87            c = mSurface.lockCanvas(dirty);
88        } catch (IllegalArgumentException e) {
89        } catch (OutOfResourcesException e) {
90        }
91        if (c == null) {
92            return;
93        }
94        c.drawColor(Color.TRANSPARENT, PorterDuff.Mode.SRC);
95        mSurfaceControl.setPosition(0, 0);
96        mOverlay.setBounds(0, 0, mScreenSize.x, mScreenSize.y);
97        mOverlay.draw(c);
98        mSurface.unlockCanvasAndPost(c);
99    }
100
101    // Note: caller responsible for being inside
102    // Surface.openTransaction() / closeTransaction()
103    public void setVisibility(boolean on) {
104        if (mSurfaceControl == null) {
105            return;
106        }
107        mVisible = on;
108        drawIfNeeded();
109        if (on) {
110            mSurfaceControl.show();
111        } else {
112            mSurfaceControl.hide();
113        }
114    }
115
116    void positionSurface(int dw, int dh, int rotation) {
117        if (mLastDW == dw && mLastDH == dh && mRotation == rotation) {
118            return;
119        }
120        mLastDW = dw;
121        mLastDH = dh;
122        mDrawNeeded = true;
123        mRotation = rotation;
124        drawIfNeeded();
125    }
126
127}
128