1 /* 2 * Copyright (C) 2016 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.dialer.callcomposer.camera; 18 19 import android.content.Context; 20 import android.hardware.Camera; 21 import android.os.Parcelable; 22 import android.view.SurfaceHolder; 23 import android.view.SurfaceView; 24 import android.view.View; 25 import java.io.IOException; 26 27 /** 28 * A software rendered preview surface for the camera. This renders slower and causes more jank, so 29 * HardwareCameraPreview is preferred if possible. 30 * 31 * <p>There is a significant amount of duplication between HardwareCameraPreview and 32 * SoftwareCameraPreview which we can't easily share due to a lack of multiple inheritance, The 33 * implementations of the shared methods are delegated to CameraPreview 34 */ 35 public class SoftwareCameraPreview extends SurfaceView implements CameraPreview.CameraPreviewHost { 36 private final CameraPreview preview; 37 SoftwareCameraPreview(final Context context)38 public SoftwareCameraPreview(final Context context) { 39 super(context); 40 preview = new CameraPreview(this); 41 getHolder() 42 .addCallback( 43 new SurfaceHolder.Callback() { 44 @Override 45 public void surfaceCreated(final SurfaceHolder surfaceHolder) { 46 CameraManager.get().setSurface(preview); 47 } 48 49 @Override 50 public void surfaceChanged( 51 final SurfaceHolder surfaceHolder, 52 final int format, 53 final int width, 54 final int height) { 55 CameraManager.get().setSurface(preview); 56 } 57 58 @Override 59 public void surfaceDestroyed(final SurfaceHolder surfaceHolder) { 60 CameraManager.get().setSurface(null); 61 } 62 }); 63 } 64 65 @Override setShown()66 public void setShown() { 67 preview.setShown(); 68 } 69 70 @Override onVisibilityChanged(final View changedView, final int visibility)71 protected void onVisibilityChanged(final View changedView, final int visibility) { 72 super.onVisibilityChanged(changedView, visibility); 73 preview.onVisibilityChanged(visibility); 74 } 75 76 @Override onDetachedFromWindow()77 protected void onDetachedFromWindow() { 78 super.onDetachedFromWindow(); 79 preview.onDetachedFromWindow(); 80 } 81 82 @Override onAttachedToWindow()83 protected void onAttachedToWindow() { 84 super.onAttachedToWindow(); 85 preview.onAttachedToWindow(); 86 } 87 88 @Override onRestoreInstanceState(final Parcelable state)89 protected void onRestoreInstanceState(final Parcelable state) { 90 super.onRestoreInstanceState(state); 91 preview.onRestoreInstanceState(); 92 } 93 94 @Override onMeasure(int widthMeasureSpec, int heightMeasureSpec)95 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 96 widthMeasureSpec = preview.getWidthMeasureSpec(widthMeasureSpec, heightMeasureSpec); 97 heightMeasureSpec = preview.getHeightMeasureSpec(widthMeasureSpec, heightMeasureSpec); 98 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 99 } 100 101 @Override getView()102 public View getView() { 103 return this; 104 } 105 106 @Override isValid()107 public boolean isValid() { 108 return getHolder() != null; 109 } 110 111 @Override startPreview(final Camera camera)112 public void startPreview(final Camera camera) throws IOException { 113 camera.setPreviewDisplay(getHolder()); 114 } 115 116 @Override onCameraPermissionGranted()117 public void onCameraPermissionGranted() { 118 preview.onCameraPermissionGranted(); 119 } 120 } 121