1 /*
2  * Copyright (C) 2015 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.messaging.ui.mediapicker;
18 
19 import android.content.Context;
20 import android.hardware.Camera;
21 import android.os.Parcelable;
22 import android.view.SurfaceHolder;
23 import android.view.SurfaceView;
24 import android.view.View;
25 
26 import java.io.IOException;
27 
28 /**
29  * A software rendered preview surface for the camera.  This renders slower and causes more jank, so
30  * HardwareCameraPreview is preferred if possible.
31  *
32  * There is a significant amount of duplication between HardwareCameraPreview and
33  * SoftwareCameraPreview which we can't easily share due to a lack of multiple inheritance, The
34  * implementations of the shared methods are delegated to CameraPreview
35  */
36 public class SoftwareCameraPreview extends SurfaceView implements CameraPreview.CameraPreviewHost {
37     private final CameraPreview mPreview;
38 
SoftwareCameraPreview(final Context context)39     public SoftwareCameraPreview(final Context context) {
40         super(context);
41         mPreview = new CameraPreview(this);
42         getHolder().addCallback(new SurfaceHolder.Callback() {
43             @Override
44             public void surfaceCreated(final SurfaceHolder surfaceHolder) {
45                 CameraManager.get().setSurface(mPreview);
46             }
47 
48             @Override
49             public void surfaceChanged(final SurfaceHolder surfaceHolder, final int format, final int width,
50                                        final int height) {
51                 CameraManager.get().setSurface(mPreview);
52             }
53 
54             @Override
55             public void surfaceDestroyed(final SurfaceHolder surfaceHolder) {
56                 CameraManager.get().setSurface(null);
57             }
58         });
59     }
60 
61 
62     @Override
onVisibilityChanged(final View changedView, final int visibility)63     protected void onVisibilityChanged(final View changedView, final int visibility) {
64         super.onVisibilityChanged(changedView, visibility);
65         mPreview.onVisibilityChanged(visibility);
66     }
67 
68     @Override
onDetachedFromWindow()69     protected void onDetachedFromWindow() {
70         super.onDetachedFromWindow();
71         mPreview.onDetachedFromWindow();
72     }
73 
74     @Override
onAttachedToWindow()75     protected void onAttachedToWindow() {
76         super.onAttachedToWindow();
77         mPreview.onAttachedToWindow();
78     }
79 
80     @Override
onRestoreInstanceState(final Parcelable state)81     protected void onRestoreInstanceState(final Parcelable state) {
82         super.onRestoreInstanceState(state);
83         mPreview.onRestoreInstanceState();
84     }
85 
86     @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)87     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
88         widthMeasureSpec = mPreview.getWidthMeasureSpec(widthMeasureSpec, heightMeasureSpec);
89         heightMeasureSpec = mPreview.getHeightMeasureSpec(widthMeasureSpec, heightMeasureSpec);
90         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
91     }
92 
93     @Override
getView()94     public View getView() {
95         return this;
96     }
97 
98     @Override
isValid()99     public boolean isValid() {
100         return getHolder() != null;
101     }
102 
103     @Override
startPreview(final Camera camera)104     public void startPreview(final Camera camera) throws IOException {
105         camera.setPreviewDisplay(getHolder());
106     }
107 
108     @Override
onCameraPermissionGranted()109     public void onCameraPermissionGranted() {
110         mPreview.onCameraPermissionGranted();
111     }
112 }
113 
114 
115