1 /*
2  * Copyright (C) 2020 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 
17 package com.android.systemui.screenshot;
18 
19 import android.content.pm.ActivityInfo;
20 import android.graphics.Canvas;
21 import android.graphics.Color;
22 import android.graphics.HardwareRenderer;
23 import android.graphics.Paint;
24 import android.graphics.RecordingCanvas;
25 import android.graphics.Rect;
26 import android.graphics.RenderNode;
27 import android.os.CancellationSignal;
28 import android.os.ICancellationSignal;
29 import android.os.RemoteException;
30 import android.view.IScrollCaptureCallbacks;
31 import android.view.IScrollCaptureConnection;
32 import android.view.Surface;
33 
34 /**
35  * An IScrollCaptureConnection which returns a sequence of solid filled rectangles in the
36  * locations requested, in alternating colors.
37  */
38 class FakeScrollCaptureConnection extends IScrollCaptureConnection.Stub {
39     private final int[] mColors = {Color.RED, Color.GREEN, Color.BLUE};
40     private IScrollCaptureCallbacks mCallbacks;
41     private Paint mPaint;
42     private int mNextColor;
43     private HwuiContext mHwuiContext;
44     private CancellationSignal mCancellationSignal;
45 
46     @Override
startCapture(Surface surface, IScrollCaptureCallbacks callbacks)47     public ICancellationSignal startCapture(Surface surface, IScrollCaptureCallbacks callbacks) {
48         mCallbacks = callbacks;
49         mHwuiContext = new HwuiContext(surface);
50         mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
51         mPaint.setStyle(Paint.Style.FILL);
52         try {
53             mCallbacks.onCaptureStarted();
54         } catch (RemoteException e) {
55             e.rethrowAsRuntimeException();
56         }
57         ICancellationSignal signal = CancellationSignal.createTransport();
58         mCancellationSignal = CancellationSignal.fromTransport(signal);
59         return signal;
60     }
61 
62     @Override
requestImage(Rect rect)63     public ICancellationSignal requestImage(Rect rect) {
64         Canvas canvas = mHwuiContext.lockCanvas(rect.width(), rect.height());
65         mPaint.setColor(mColors[mNextColor]);
66         canvas.drawRect(rect, mPaint);
67         mNextColor = (mNextColor++) % mColors.length;
68         mHwuiContext.unlockAndPost(canvas);
69         try {
70             mCallbacks.onImageRequestCompleted(0, rect);
71         } catch (RemoteException e) {
72             e.rethrowAsRuntimeException();
73         }
74         ICancellationSignal signal = CancellationSignal.createTransport();
75         mCancellationSignal = CancellationSignal.fromTransport(signal);
76         return signal;
77     }
78 
79     @Override
endCapture()80     public ICancellationSignal endCapture() {
81         try {
82             mCallbacks.onCaptureEnded();
83         } catch (RemoteException e) {
84             e.rethrowAsRuntimeException();
85         } finally {
86             mHwuiContext.destroy();
87             mCallbacks = null;
88         }
89         ICancellationSignal signal = CancellationSignal.createTransport();
90         mCancellationSignal = CancellationSignal.fromTransport(signal);
91         return signal;
92     }
93 
94     @Override
close()95     public void close() throws RemoteException {
96     }
97 
98     // From android.view.Surface, but issues render requests synchronously with waitForPresent(true)
99     private static final class HwuiContext {
100         private final RenderNode mRenderNode;
101         private final HardwareRenderer mHardwareRenderer;
102         private RecordingCanvas mCanvas;
103 
HwuiContext(Surface surface)104         HwuiContext(Surface surface) {
105             mRenderNode = RenderNode.create("HwuiCanvas", null);
106             mRenderNode.setClipToBounds(false);
107             mRenderNode.setForceDarkAllowed(false);
108 
109             mHardwareRenderer = new HardwareRenderer();
110             mHardwareRenderer.setContentRoot(mRenderNode);
111             mHardwareRenderer.setSurface(surface, true);
112             mHardwareRenderer.setColorMode(ActivityInfo.COLOR_MODE_DEFAULT);
113             mHardwareRenderer.setLightSourceAlpha(0.0f, 0.0f);
114             mHardwareRenderer.setLightSourceGeometry(0.0f, 0.0f, 0.0f, 0.0f);
115         }
116 
lockCanvas(int width, int height)117         Canvas lockCanvas(int width, int height) {
118             if (mCanvas != null) {
119                 throw new IllegalStateException("Surface was already locked!");
120             }
121             mCanvas = mRenderNode.beginRecording(width, height);
122             return mCanvas;
123         }
124 
unlockAndPost(Canvas canvas)125         void unlockAndPost(Canvas canvas) {
126             if (canvas != mCanvas) {
127                 throw new IllegalArgumentException("canvas object must be the same instance that "
128                         + "was previously returned by lockCanvas");
129             }
130             mRenderNode.endRecording();
131             mCanvas = null;
132             mHardwareRenderer.createRenderRequest()
133                     .setVsyncTime(System.nanoTime())
134                     .setWaitForPresent(true) // sync!
135                     .syncAndDraw();
136         }
137 
destroy()138         void destroy() {
139             mHardwareRenderer.destroy();
140         }
141     }
142 }
143