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      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.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 import java.io.IOException;
     27 
     28 /**
     29  * A hardware accelerated preview texture for the camera. This is the preferred CameraPreview
     30  * because it animates smoother. When hardware acceleration isn't available, SoftwareCameraPreview
     31  * is used.
     32  *
     33  * <p>There is a significant amount of duplication between HardwareCameraPreview and
     34  * SoftwareCameraPreview which we can't easily share due to a lack of multiple inheritance, The
     35  * implementations of the shared methods are delegated to CameraPreview
     36  */
     37 public class HardwareCameraPreview extends TextureView implements CameraPreview.CameraPreviewHost {
     38   private CameraPreview preview;
     39 
     40   public HardwareCameraPreview(final Context context, final AttributeSet attrs) {
     41     super(context, attrs);
     42     preview = new CameraPreview(this);
     43     setSurfaceTextureListener(
     44         new SurfaceTextureListener() {
     45           @Override
     46           public void onSurfaceTextureAvailable(
     47               final SurfaceTexture surfaceTexture, final int i, final int i2) {
     48             CameraManager.get().setSurface(preview);
     49           }
     50 
     51           @Override
     52           public void onSurfaceTextureSizeChanged(
     53               final SurfaceTexture surfaceTexture, final int i, final int i2) {
     54             CameraManager.get().setSurface(preview);
     55           }
     56 
     57           @Override
     58           public boolean onSurfaceTextureDestroyed(final SurfaceTexture surfaceTexture) {
     59             CameraManager.get().setSurface(null);
     60             return true;
     61           }
     62 
     63           @Override
     64           public void onSurfaceTextureUpdated(final SurfaceTexture surfaceTexture) {
     65             CameraManager.get().setSurface(preview);
     66           }
     67         });
     68   }
     69 
     70   @Override
     71   public void setShown() {
     72     preview.setShown();
     73   }
     74 
     75   @Override
     76   protected void onVisibilityChanged(final View changedView, final int visibility) {
     77     super.onVisibilityChanged(changedView, visibility);
     78     preview.onVisibilityChanged(visibility);
     79   }
     80 
     81   @Override
     82   protected void onDetachedFromWindow() {
     83     super.onDetachedFromWindow();
     84     preview.onDetachedFromWindow();
     85   }
     86 
     87   @Override
     88   protected void onAttachedToWindow() {
     89     super.onAttachedToWindow();
     90     preview.onAttachedToWindow();
     91   }
     92 
     93   @Override
     94   protected void onRestoreInstanceState(final Parcelable state) {
     95     super.onRestoreInstanceState(state);
     96     preview.onRestoreInstanceState();
     97   }
     98 
     99   @Override
    100   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    101     widthMeasureSpec = preview.getWidthMeasureSpec(widthMeasureSpec, heightMeasureSpec);
    102     heightMeasureSpec = preview.getHeightMeasureSpec(widthMeasureSpec, heightMeasureSpec);
    103     super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    104   }
    105 
    106   @Override
    107   public View getView() {
    108     return this;
    109   }
    110 
    111   @Override
    112   public boolean isValid() {
    113     return getSurfaceTexture() != null;
    114   }
    115 
    116   @Override
    117   public void startPreview(final Camera camera) throws IOException {
    118     camera.setPreviewTexture(getSurfaceTexture());
    119   }
    120 
    121   @Override
    122   public void onCameraPermissionGranted() {
    123     preview.onCameraPermissionGranted();
    124   }
    125 }
    126