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
17package com.android.messaging.ui.mediapicker;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.hardware.Camera;
22import android.os.Bundle;
23import android.os.Parcelable;
24import android.util.AttributeSet;
25import android.view.ViewGroup;
26import android.widget.FrameLayout;
27import com.android.messaging.R;
28import com.android.messaging.ui.PersistentInstanceState;
29import com.android.messaging.util.ThreadUtil;
30
31public class CameraMediaChooserView extends FrameLayout implements PersistentInstanceState {
32    private static final String KEY_CAMERA_INDEX = "camera_index";
33
34    // True if we have at least queued an update to the view tree to support software rendering
35    // fallback
36    private boolean mIsSoftwareFallbackActive;
37
38    public CameraMediaChooserView(final Context context, final AttributeSet attrs) {
39        super(context, attrs);
40    }
41
42    @Override
43    protected Parcelable onSaveInstanceState() {
44        final Bundle bundle = new Bundle();
45        bundle.putInt(KEY_CAMERA_INDEX, CameraManager.get().getCameraIndex());
46        return bundle;
47    }
48
49    @Override
50    protected void onRestoreInstanceState(final Parcelable state) {
51        if (!(state instanceof Bundle)) {
52            return;
53        }
54
55        final Bundle bundle = (Bundle) state;
56        CameraManager.get().selectCameraByIndex(bundle.getInt(KEY_CAMERA_INDEX));
57    }
58
59    @Override
60    public Parcelable saveState() {
61        return onSaveInstanceState();
62    }
63
64    @Override
65    public void restoreState(final Parcelable restoredState) {
66        onRestoreInstanceState(restoredState);
67    }
68
69    @Override
70    public void resetState() {
71        CameraManager.get().selectCamera(Camera.CameraInfo.CAMERA_FACING_BACK);
72    }
73
74    @Override
75    protected void onDraw(final Canvas canvas) {
76        super.onDraw(canvas);
77        // If the canvas isn't hardware accelerated, we have to replace the HardwareCameraPreview
78        // with a SoftwareCameraPreview which supports software rendering
79        if (!canvas.isHardwareAccelerated() && !mIsSoftwareFallbackActive) {
80            mIsSoftwareFallbackActive = true;
81            // Post modifying the tree since we can't modify the view tree during a draw pass
82            ThreadUtil.getMainThreadHandler().post(new Runnable() {
83                @Override
84                public void run() {
85                    final HardwareCameraPreview cameraPreview =
86                            (HardwareCameraPreview) findViewById(R.id.camera_preview);
87                    if (cameraPreview == null) {
88                        return;
89                    }
90                    final ViewGroup parent = ((ViewGroup) cameraPreview.getParent());
91                    final int index = parent.indexOfChild(cameraPreview);
92                    final SoftwareCameraPreview softwareCameraPreview =
93                            new SoftwareCameraPreview(getContext());
94                    // Be sure to remove the hardware view before adding the software view to
95                    // prevent having 2 camera previews active at the same time
96                    parent.removeView(cameraPreview);
97                    parent.addView(softwareCameraPreview, index);
98                }
99            });
100        }
101    }
102}
103