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.camera.captureintent.state; 18 19 import com.google.common.base.Optional; 20 21 import com.android.camera.async.RefCountBase; 22 import com.android.camera.captureintent.CaptureIntentConfig; 23 import com.android.camera.captureintent.resource.ResourceConstructed; 24 import com.android.camera.captureintent.resource.ResourceSurfaceTexture; 25 import com.android.camera.captureintent.resource.ResourceSurfaceTextureImpl; 26 import com.android.camera.captureintent.resource.ResourceSurfaceTextureNexus4Impl; 27 import com.android.camera.captureintent.stateful.EventHandler; 28 import com.android.camera.captureintent.event.EventOnSurfaceTextureAvailable; 29 import com.android.camera.captureintent.event.EventPause; 30 import com.android.camera.captureintent.stateful.State; 31 import com.android.camera.captureintent.stateful.StateImpl; 32 33 /** 34 * Represents a state that module is active in foreground but waiting for 35 * surface texture being available. 36 */ 37 public final class StateForeground extends StateImpl { 38 private final RefCountBase<ResourceConstructed> mResourceConstructed; 39 40 // Can be used to transition from Background on resume. from( State previousState, RefCountBase<ResourceConstructed> resourceConstructed)41 public static StateForeground from( 42 State previousState, 43 RefCountBase<ResourceConstructed> resourceConstructed) { 44 return new StateForeground(previousState, resourceConstructed); 45 } 46 StateForeground( State previousState, RefCountBase<ResourceConstructed> resourceConstructed)47 private StateForeground( 48 State previousState, 49 RefCountBase<ResourceConstructed> resourceConstructed) { 50 super(previousState); 51 mResourceConstructed = resourceConstructed; 52 mResourceConstructed.addRef(); // Will be balanced in onLeave(). 53 registerEventHandlers(); 54 } 55 registerEventHandlers()56 private void registerEventHandlers() { 57 /** Handles EventPause. */ 58 EventHandler<EventPause> pauseHandler = new EventHandler<EventPause>() { 59 @Override 60 public Optional<State> processEvent(EventPause event) { 61 return Optional.of((State) StateBackground.from( 62 StateForeground.this, mResourceConstructed)); 63 } 64 }; 65 setEventHandler(EventPause.class, pauseHandler); 66 67 /** Handles EventOnSurfaceTextureAvailable */ 68 EventHandler<EventOnSurfaceTextureAvailable> surfaceTextureAvailableHandler = 69 new EventHandler<EventOnSurfaceTextureAvailable>() { 70 @Override 71 public Optional<State> processEvent(EventOnSurfaceTextureAvailable event) { 72 RefCountBase<ResourceSurfaceTexture> resourceSurfaceTexture; 73 if (CaptureIntentConfig.WORKAROUND_PREVIEW_STRETCH_BUG_NEXUS4) { 74 resourceSurfaceTexture = ResourceSurfaceTextureNexus4Impl.create( 75 mResourceConstructed, 76 event.getSurfaceTexture()); 77 } else { 78 resourceSurfaceTexture = ResourceSurfaceTextureImpl.create( 79 mResourceConstructed, 80 event.getSurfaceTexture()); 81 } 82 State nextState = StateForegroundWithSurfaceTexture.from( 83 StateForeground.this, 84 mResourceConstructed, 85 resourceSurfaceTexture); 86 // Release ResourceSurfaceTexture after it was handed 87 // over to StateForegroundWithSurfaceTexture. 88 resourceSurfaceTexture.close(); 89 return Optional.of(nextState); 90 } 91 }; 92 setEventHandler( 93 EventOnSurfaceTextureAvailable.class, surfaceTextureAvailableHandler); 94 } 95 96 @Override onEnter()97 public Optional<State> onEnter() { 98 return NO_CHANGE; 99 } 100 101 @Override onLeave()102 public void onLeave() { 103 mResourceConstructed.close(); 104 } 105 }