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.camera.captureintent.state;
18
19import com.android.camera.async.RefCountBase;
20import com.android.camera.captureintent.resource.ResourceConstructed;
21import com.android.camera.captureintent.resource.ResourceSurfaceTexture;
22import com.android.camera.captureintent.stateful.State;
23import com.android.camera.captureintent.stateful.StateImpl;
24import com.android.camera.device.CameraId;
25import com.android.camera.one.OneCamera;
26import com.android.camera.one.OneCameraAccessException;
27import com.android.camera.one.OneCameraCharacteristics;
28import com.google.common.annotations.VisibleForTesting;
29import com.google.common.base.Optional;
30
31/**
32 * Represents a state that the surface texture is available to the module.
33 */
34public final class StateForegroundWithSurfaceTexture extends StateImpl {
35    private final RefCountBase<ResourceConstructed> mResourceConstructed;
36    private final RefCountBase<ResourceSurfaceTexture> mResourceSurfaceTexture;
37
38    // Used to transition from BackgroundWithSurfaceTexture on module is resumed.
39    public static StateForegroundWithSurfaceTexture from(
40            State previousState,
41            RefCountBase<ResourceConstructed> resourceConstructed,
42            RefCountBase<ResourceSurfaceTexture> resourceSurfaceTexture) {
43        return new StateForegroundWithSurfaceTexture(
44                previousState,
45                resourceConstructed,
46                resourceSurfaceTexture);
47    }
48
49    private StateForegroundWithSurfaceTexture(
50            State previousState,
51            RefCountBase<ResourceConstructed> resourceConstructed,
52            RefCountBase<ResourceSurfaceTexture> resourceSurfaceTexture) {
53        super(previousState);
54        mResourceConstructed = resourceConstructed;
55        mResourceConstructed.addRef();     // Will be balanced in onLeave().
56        mResourceSurfaceTexture = resourceSurfaceTexture;
57        mResourceSurfaceTexture.addRef();
58    }
59
60    @Override
61    public Optional<State> onEnter() {
62        try {
63            // Pick a preview size with the right aspect ratio.
64            final OneCamera.Facing cameraFacing =
65                    mResourceConstructed.get().getCameraFacingSetting().getCameraFacing();
66
67            CameraId key = mResourceConstructed.get().getOneCameraManager()
68                  .findFirstCameraFacing(cameraFacing);
69
70            final OneCameraCharacteristics characteristics =
71                    mResourceConstructed.get().getOneCameraManager().getOneCameraCharacteristics(
72                          key);
73            return Optional.of((State) StateOpeningCamera.from(this, mResourceConstructed,
74                    mResourceSurfaceTexture, cameraFacing, key, characteristics));
75        } catch (OneCameraAccessException ex) {
76            return Optional.of((State) StateFatal.from(this, mResourceConstructed));
77        }
78    }
79
80    @Override
81    public void onLeave() {
82        mResourceConstructed.close();
83        mResourceSurfaceTexture.close();
84    }
85
86    @VisibleForTesting
87    public RefCountBase<ResourceSurfaceTexture> getResourceSurfaceTexture() {
88        return mResourceSurfaceTexture;
89    }
90}
91