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