/* * Copyright (C) 2015 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.camera.captureintent.state; import com.google.common.base.Optional; import com.android.camera.async.RefCountBase; import com.android.camera.captureintent.CaptureIntentConfig; import com.android.camera.captureintent.resource.ResourceConstructed; import com.android.camera.captureintent.resource.ResourceSurfaceTexture; import com.android.camera.captureintent.resource.ResourceSurfaceTextureImpl; import com.android.camera.captureintent.resource.ResourceSurfaceTextureNexus4Impl; import com.android.camera.captureintent.stateful.EventHandler; import com.android.camera.captureintent.event.EventOnSurfaceTextureAvailable; import com.android.camera.captureintent.event.EventPause; import com.android.camera.captureintent.stateful.State; import com.android.camera.captureintent.stateful.StateImpl; /** * Represents a state that module is active in foreground but waiting for * surface texture being available. */ public final class StateForeground extends StateImpl { private final RefCountBase mResourceConstructed; // Can be used to transition from Background on resume. public static StateForeground from( State previousState, RefCountBase resourceConstructed) { return new StateForeground(previousState, resourceConstructed); } private StateForeground( State previousState, RefCountBase resourceConstructed) { super(previousState); mResourceConstructed = resourceConstructed; mResourceConstructed.addRef(); // Will be balanced in onLeave(). registerEventHandlers(); } private void registerEventHandlers() { /** Handles EventPause. */ EventHandler pauseHandler = new EventHandler() { @Override public Optional processEvent(EventPause event) { return Optional.of((State) StateBackground.from( StateForeground.this, mResourceConstructed)); } }; setEventHandler(EventPause.class, pauseHandler); /** Handles EventOnSurfaceTextureAvailable */ EventHandler surfaceTextureAvailableHandler = new EventHandler() { @Override public Optional processEvent(EventOnSurfaceTextureAvailable event) { RefCountBase resourceSurfaceTexture; if (CaptureIntentConfig.WORKAROUND_PREVIEW_STRETCH_BUG_NEXUS4) { resourceSurfaceTexture = ResourceSurfaceTextureNexus4Impl.create( mResourceConstructed, event.getSurfaceTexture()); } else { resourceSurfaceTexture = ResourceSurfaceTextureImpl.create( mResourceConstructed, event.getSurfaceTexture()); } State nextState = StateForegroundWithSurfaceTexture.from( StateForeground.this, mResourceConstructed, resourceSurfaceTexture); // Release ResourceSurfaceTexture after it was handed // over to StateForegroundWithSurfaceTexture. resourceSurfaceTexture.close(); return Optional.of(nextState); } }; setEventHandler( EventOnSurfaceTextureAvailable.class, surfaceTextureAvailableHandler); } @Override public Optional onEnter() { return NO_CHANGE; } @Override public void onLeave() { mResourceConstructed.close(); } }