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
17package com.android.dialer.callcomposer.camera;
18
19import android.content.Context;
20import android.content.res.Configuration;
21import android.hardware.Camera;
22import android.view.View;
23import android.view.View.MeasureSpec;
24import android.view.View.OnTouchListener;
25import com.android.dialer.common.Assert;
26import com.android.dialer.util.PermissionsUtil;
27import java.io.IOException;
28
29/**
30 * Contains shared code for SoftwareCameraPreview and HardwareCameraPreview, cannot use inheritance
31 * because those classes must inherit from separate Views, so those classes delegate calls to this
32 * helper class. Specifics for each implementation are in CameraPreviewHost
33 */
34public class CameraPreview {
35  /** Implemented by the camera for rendering. */
36  public interface CameraPreviewHost {
37    View getView();
38
39    boolean isValid();
40
41    void startPreview(final Camera camera) throws IOException;
42
43    void onCameraPermissionGranted();
44
45    void setShown();
46  }
47
48  private int mCameraWidth = -1;
49  private int mCameraHeight = -1;
50  private boolean mTabHasBeenShown = false;
51  private OnTouchListener mListener;
52
53  private final CameraPreviewHost mHost;
54
55  public CameraPreview(final CameraPreviewHost host) {
56    Assert.isNotNull(host);
57    Assert.isNotNull(host.getView());
58    mHost = host;
59  }
60
61  // This is set when the tab is actually selected.
62  public void setShown() {
63    mTabHasBeenShown = true;
64    maybeOpenCamera();
65  }
66
67  // Opening camera is very expensive. Most of the ANR reports seem to be related to the camera.
68  // So we delay until the camera is actually needed.  See b/23287938
69  private void maybeOpenCamera() {
70    boolean visible = mHost.getView().getVisibility() == View.VISIBLE;
71    if (mTabHasBeenShown && visible && PermissionsUtil.hasCameraPermissions(getContext())) {
72      CameraManager.get().openCamera();
73    }
74  }
75
76  public void setSize(final Camera.Size size, final int orientation) {
77    switch (orientation) {
78      case 0:
79      case 180:
80        mCameraWidth = size.width;
81        mCameraHeight = size.height;
82        break;
83      case 90:
84      case 270:
85      default:
86        mCameraWidth = size.height;
87        mCameraHeight = size.width;
88    }
89    mHost.getView().requestLayout();
90  }
91
92  public int getWidthMeasureSpec(final int widthMeasureSpec, final int heightMeasureSpec) {
93    if (mCameraHeight >= 0) {
94      final int width = View.MeasureSpec.getSize(widthMeasureSpec);
95      return MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
96    } else {
97      return widthMeasureSpec;
98    }
99  }
100
101  public int getHeightMeasureSpec(final int widthMeasureSpec, final int heightMeasureSpec) {
102    if (mCameraHeight >= 0) {
103      final int orientation = getContext().getResources().getConfiguration().orientation;
104      final int width = View.MeasureSpec.getSize(widthMeasureSpec);
105      final float aspectRatio = (float) mCameraWidth / (float) mCameraHeight;
106      int height;
107      if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
108        height = (int) (width * aspectRatio);
109      } else {
110        height = (int) (width / aspectRatio);
111      }
112      return View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
113    } else {
114      return heightMeasureSpec;
115    }
116  }
117
118  // onVisibilityChanged is set to Visible when the tab is _created_,
119  //   which may be when the user is viewing a different tab.
120  public void onVisibilityChanged(final int visibility) {
121    if (PermissionsUtil.hasCameraPermissions(getContext())) {
122      if (visibility == View.VISIBLE) {
123        maybeOpenCamera();
124      } else {
125        CameraManager.get().closeCamera();
126      }
127    }
128  }
129
130  public Context getContext() {
131    return mHost.getView().getContext();
132  }
133
134  public void setOnTouchListener(final View.OnTouchListener listener) {
135    mListener = listener;
136    mHost.getView().setOnTouchListener(listener);
137  }
138
139  public void setFocusable(boolean focusable) {
140    mHost.getView().setOnTouchListener(focusable ? mListener : null);
141  }
142
143  public int getHeight() {
144    return mHost.getView().getHeight();
145  }
146
147  public void onAttachedToWindow() {
148    maybeOpenCamera();
149  }
150
151  public void onDetachedFromWindow() {
152    CameraManager.get().closeCamera();
153  }
154
155  public void onRestoreInstanceState() {
156    maybeOpenCamera();
157  }
158
159  public void onCameraPermissionGranted() {
160    maybeOpenCamera();
161  }
162
163  /** @return True if the view is valid and prepared for the camera to start showing the preview */
164  public boolean isValid() {
165    return mHost.isValid();
166  }
167
168  /**
169   * Starts the camera preview on the current surface. Abstracts out the differences in API from the
170   * CameraManager
171   *
172   * @throws IOException Which is caught by the CameraManager to display an error
173   */
174  public void startPreview(final Camera camera) throws IOException {
175    mHost.startPreview(camera);
176  }
177}
178