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.messaging.ui.mediapicker; 18 19 import android.content.Context; 20 import android.graphics.SurfaceTexture; 21 import android.hardware.Camera; 22 import android.os.Parcelable; 23 import android.util.AttributeSet; 24 import android.view.TextureView; 25 import android.view.View; 26 27 import java.io.IOException; 28 29 /** 30 * A hardware accelerated preview texture for the camera. This is the preferred CameraPreview 31 * because it animates smoother. When hardware acceleration isn't available, SoftwareCameraPreview 32 * is used. 33 * 34 * There is a significant amount of duplication between HardwareCameraPreview and 35 * SoftwareCameraPreview which we can't easily share due to a lack of multiple inheritance, The 36 * implementations of the shared methods are delegated to CameraPreview 37 */ 38 public class HardwareCameraPreview extends TextureView implements CameraPreview.CameraPreviewHost { 39 private CameraPreview mPreview; 40 HardwareCameraPreview(final Context context, final AttributeSet attrs)41 public HardwareCameraPreview(final Context context, final AttributeSet attrs) { 42 super(context, attrs); 43 mPreview = new CameraPreview(this); 44 setSurfaceTextureListener(new SurfaceTextureListener() { 45 @Override 46 public void onSurfaceTextureAvailable(final SurfaceTexture surfaceTexture, final int i, final int i2) { 47 CameraManager.get().setSurface(mPreview); 48 } 49 50 @Override 51 public void onSurfaceTextureSizeChanged(final SurfaceTexture surfaceTexture, final int i, final int i2) { 52 CameraManager.get().setSurface(mPreview); 53 } 54 55 @Override 56 public boolean onSurfaceTextureDestroyed(final SurfaceTexture surfaceTexture) { 57 CameraManager.get().setSurface(null); 58 return true; 59 } 60 61 @Override 62 public void onSurfaceTextureUpdated(final SurfaceTexture surfaceTexture) { 63 CameraManager.get().setSurface(mPreview); 64 } 65 }); 66 } 67 68 @Override onVisibilityChanged(final View changedView, final int visibility)69 protected void onVisibilityChanged(final View changedView, final int visibility) { 70 super.onVisibilityChanged(changedView, visibility); 71 mPreview.onVisibilityChanged(visibility); 72 } 73 74 @Override onDetachedFromWindow()75 protected void onDetachedFromWindow() { 76 super.onDetachedFromWindow(); 77 mPreview.onDetachedFromWindow(); 78 } 79 80 @Override onAttachedToWindow()81 protected void onAttachedToWindow() { 82 super.onAttachedToWindow(); 83 mPreview.onAttachedToWindow(); 84 } 85 86 @Override onRestoreInstanceState(final Parcelable state)87 protected void onRestoreInstanceState(final Parcelable state) { 88 super.onRestoreInstanceState(state); 89 mPreview.onRestoreInstanceState(); 90 } 91 92 @Override onMeasure(int widthMeasureSpec, int heightMeasureSpec)93 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 94 widthMeasureSpec = mPreview.getWidthMeasureSpec(widthMeasureSpec, heightMeasureSpec); 95 heightMeasureSpec = mPreview.getHeightMeasureSpec(widthMeasureSpec, heightMeasureSpec); 96 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 97 } 98 99 @Override getView()100 public View getView() { 101 return this; 102 } 103 104 @Override isValid()105 public boolean isValid() { 106 return getSurfaceTexture() != null; 107 } 108 109 @Override startPreview(final Camera camera)110 public void startPreview(final Camera camera) throws IOException { 111 camera.setPreviewTexture(getSurfaceTexture()); 112 } 113 114 @Override onCameraPermissionGranted()115 public void onCameraPermissionGranted() { 116 mPreview.onCameraPermissionGranted(); 117 } 118 } 119