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.graphics.SurfaceTexture;
21 import android.hardware.Camera;
22 import android.os.Parcelable;
23 import android.util.AttributeSet;
24 import android.view.TextureView;
25 import android.view.View;
26 
27 import java.io.IOException;
28 
29 /**
30  * A hardware accelerated preview texture for the camera.  This is the preferred CameraPreview
31  * because it animates smoother.  When hardware acceleration isn't available, SoftwareCameraPreview
32  * is used.
33  *
34  * There is a significant amount of duplication between HardwareCameraPreview and
35  * SoftwareCameraPreview which we can't easily share due to a lack of multiple inheritance, The
36  * implementations of the shared methods are delegated to CameraPreview
37  */
38 public class HardwareCameraPreview extends TextureView implements CameraPreview.CameraPreviewHost {
39     private CameraPreview mPreview;
40 
HardwareCameraPreview(final Context context, final AttributeSet attrs)41     public HardwareCameraPreview(final Context context, final AttributeSet attrs) {
42         super(context, attrs);
43         mPreview = new CameraPreview(this);
44         setSurfaceTextureListener(new SurfaceTextureListener() {
45             @Override
46             public void onSurfaceTextureAvailable(final SurfaceTexture surfaceTexture, final int i, final int i2) {
47                 CameraManager.get().setSurface(mPreview);
48             }
49 
50             @Override
51             public void onSurfaceTextureSizeChanged(final SurfaceTexture surfaceTexture, final int i, final int i2) {
52                 CameraManager.get().setSurface(mPreview);
53             }
54 
55             @Override
56             public boolean onSurfaceTextureDestroyed(final SurfaceTexture surfaceTexture) {
57                 CameraManager.get().setSurface(null);
58                 return true;
59             }
60 
61             @Override
62             public void onSurfaceTextureUpdated(final SurfaceTexture surfaceTexture) {
63                 CameraManager.get().setSurface(mPreview);
64             }
65         });
66     }
67 
68     @Override
onVisibilityChanged(final View changedView, final int visibility)69     protected void onVisibilityChanged(final View changedView, final int visibility) {
70         super.onVisibilityChanged(changedView, visibility);
71         mPreview.onVisibilityChanged(visibility);
72     }
73 
74     @Override
onDetachedFromWindow()75     protected void onDetachedFromWindow() {
76         super.onDetachedFromWindow();
77         mPreview.onDetachedFromWindow();
78     }
79 
80     @Override
onAttachedToWindow()81     protected void onAttachedToWindow() {
82         super.onAttachedToWindow();
83         mPreview.onAttachedToWindow();
84     }
85 
86     @Override
onRestoreInstanceState(final Parcelable state)87     protected void onRestoreInstanceState(final Parcelable state) {
88         super.onRestoreInstanceState(state);
89         mPreview.onRestoreInstanceState();
90     }
91 
92     @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)93     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
94         widthMeasureSpec = mPreview.getWidthMeasureSpec(widthMeasureSpec, heightMeasureSpec);
95         heightMeasureSpec = mPreview.getHeightMeasureSpec(widthMeasureSpec, heightMeasureSpec);
96         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
97     }
98 
99     @Override
getView()100     public View getView() {
101         return this;
102     }
103 
104     @Override
isValid()105     public boolean isValid() {
106         return getSurfaceTexture() != null;
107     }
108 
109     @Override
startPreview(final Camera camera)110     public void startPreview(final Camera camera) throws IOException {
111         camera.setPreviewTexture(getSurfaceTexture());
112     }
113 
114     @Override
onCameraPermissionGranted()115     public void onCameraPermissionGranted() {
116         mPreview.onCameraPermissionGranted();
117     }
118 }
119