1 /*
2  * Copyright (C) 2016 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.dialer.callcomposer.cameraui;
18 
19 import android.content.Context;
20 import android.graphics.Canvas;
21 import android.hardware.Camera;
22 import android.os.Bundle;
23 import android.os.Parcelable;
24 import android.util.AttributeSet;
25 import android.view.ViewGroup;
26 import android.widget.FrameLayout;
27 import com.android.dialer.callcomposer.camera.CameraManager;
28 import com.android.dialer.callcomposer.camera.HardwareCameraPreview;
29 import com.android.dialer.callcomposer.camera.SoftwareCameraPreview;
30 import com.android.dialer.common.LogUtil;
31 
32 /** Used to display the view of the camera. */
33 public class CameraMediaChooserView extends FrameLayout {
34   private static final String STATE_CAMERA_INDEX = "camera_index";
35   private static final String STATE_SUPER = "super";
36 
37   // True if we have at least queued an update to the view tree to support software rendering
38   // fallback
39   private boolean isSoftwareFallbackActive;
40 
CameraMediaChooserView(final Context context, final AttributeSet attrs)41   public CameraMediaChooserView(final Context context, final AttributeSet attrs) {
42     super(context, attrs);
43   }
44 
45   @Override
onSaveInstanceState()46   protected Parcelable onSaveInstanceState() {
47     final Bundle bundle = new Bundle();
48     bundle.putParcelable(STATE_SUPER, super.onSaveInstanceState());
49     final int cameraIndex = CameraManager.get().getCameraIndex();
50     LogUtil.i("CameraMediaChooserView.onSaveInstanceState", "saving camera index:" + cameraIndex);
51     bundle.putInt(STATE_CAMERA_INDEX, cameraIndex);
52     return bundle;
53   }
54 
55   @Override
onRestoreInstanceState(final Parcelable state)56   protected void onRestoreInstanceState(final Parcelable state) {
57     if (!(state instanceof Bundle)) {
58       return;
59     }
60 
61     final Bundle bundle = (Bundle) state;
62     final int cameraIndex = bundle.getInt(STATE_CAMERA_INDEX);
63     super.onRestoreInstanceState(bundle.getParcelable(STATE_SUPER));
64 
65     LogUtil.i(
66         "CameraMediaChooserView.onRestoreInstanceState", "restoring camera index:" + cameraIndex);
67     if (cameraIndex != -1) {
68       CameraManager.get().selectCameraByIndex(cameraIndex);
69     } else {
70       resetState();
71     }
72   }
73 
resetState()74   public void resetState() {
75     CameraManager.get().selectCamera(Camera.CameraInfo.CAMERA_FACING_BACK);
76   }
77 
78   @Override
onDraw(final Canvas canvas)79   protected void onDraw(final Canvas canvas) {
80     super.onDraw(canvas);
81     // If the canvas isn't hardware accelerated, we have to replace the HardwareCameraPreview
82     // with a SoftwareCameraPreview which supports software rendering
83     if (!canvas.isHardwareAccelerated() && !isSoftwareFallbackActive) {
84       isSoftwareFallbackActive = true;
85       // Post modifying the tree since we can't modify the view tree during a draw pass
86       post(
87           new Runnable() {
88             @Override
89             public void run() {
90               final HardwareCameraPreview cameraPreview =
91                   (HardwareCameraPreview) findViewById(R.id.camera_preview);
92               if (cameraPreview == null) {
93                 return;
94               }
95               final ViewGroup parent = ((ViewGroup) cameraPreview.getParent());
96               final int index = parent.indexOfChild(cameraPreview);
97               final SoftwareCameraPreview softwareCameraPreview =
98                   new SoftwareCameraPreview(getContext());
99               // Be sure to remove the hardware view before adding the software view to
100               // prevent having 2 camera previews active at the same time
101               parent.removeView(cameraPreview);
102               parent.addView(softwareCameraPreview, index);
103             }
104           });
105     }
106   }
107 }
108