1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * Copyright (C) 2015-2016 Mopria Alliance, Inc. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package com.android.bips.jni; 19 20 import android.content.ComponentName; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.content.ServiceConnection; 24 import android.os.IBinder; 25 import android.os.ParcelFileDescriptor; 26 import android.os.RemoteException; 27 import android.util.Log; 28 29 import com.android.bips.render.IPdfRender; 30 import com.android.bips.render.PdfRenderService; 31 32 import java.io.File; 33 import java.io.FileNotFoundException; 34 import java.io.IOException; 35 import java.io.InputStream; 36 import java.nio.ByteBuffer; 37 38 /** 39 * Renders pages of a PDF into an RGB buffer. For security, relies on a remote rendering service. 40 */ 41 public class PdfRender { 42 private static final String TAG = PdfRender.class.getSimpleName(); 43 private static final boolean DEBUG = false; 44 45 /** The current singleton instance */ 46 private static PdfRender sInstance; 47 48 private final Context mContext; 49 private final Intent mIntent; 50 private IPdfRender mService; 51 private String mCurrentFile; 52 53 /** 54 * Returns the PdfRender singleton, creating it if necessary. 55 */ 56 public static PdfRender getInstance(Context context) { 57 // Native code might call this without a context 58 if (sInstance == null && context != null) { 59 synchronized(PdfRender.class) { 60 sInstance = new PdfRender(context.getApplicationContext()); 61 } 62 } 63 return sInstance; 64 } 65 66 private ServiceConnection mConnection = new ServiceConnection() { 67 public void onServiceConnected(ComponentName className, IBinder service) { 68 if (DEBUG) Log.d(TAG, "service connected"); 69 mService = IPdfRender.Stub.asInterface(service); 70 } 71 72 public void onServiceDisconnected(ComponentName className) { 73 Log.w(TAG, "PdfRender service unexpectedly disconnected, reconnecting"); 74 mService = null; 75 mContext.bindService(mIntent, this, Context.BIND_AUTO_CREATE); 76 } 77 }; 78 79 private PdfRender(Context context) { 80 mContext = context; 81 mIntent = new Intent(context, PdfRenderService.class); 82 context.bindService(mIntent, mConnection, Context.BIND_AUTO_CREATE); 83 } 84 85 /** Shut down the PDF renderer */ 86 public void close() { 87 mContext.unbindService(mConnection); 88 mService = null; 89 sInstance = null; 90 } 91 92 /** 93 * Opens the specified document, returning the page count or 0 on error. (Called by native 94 * code.) 95 */ 96 private int openDocument(String fileName) { 97 if (DEBUG) Log.d(TAG, "openDocument() " + fileName); 98 if (mService == null) return 0; 99 100 if (mCurrentFile != null && !mCurrentFile.equals(fileName)) { 101 closeDocument(); 102 } 103 104 try { 105 ParcelFileDescriptor pfd = ParcelFileDescriptor.open(new File(fileName), 106 ParcelFileDescriptor.MODE_READ_ONLY); 107 return mService.openDocument(pfd); 108 } catch (RemoteException | FileNotFoundException ex) { 109 Log.w(TAG, "Failed to open " + fileName, ex); 110 return 0; 111 } 112 } 113 114 /** 115 * Returns the size of the specified page or null on error. (Called by native code.) 116 * @param page 0-based page 117 * @return width and height of page in points (1/72") 118 */ 119 public SizeD getPageSize(int page) { 120 if (DEBUG) Log.d(TAG, "getPageSize() page=" + page); 121 if (mService == null) return null; 122 123 try { 124 return mService.getPageSize(page - 1); 125 } catch (RemoteException | IllegalArgumentException ex) { 126 Log.w(TAG, "getPageWidth failed", ex); 127 return null; 128 } 129 } 130 131 /** 132 * Renders the content of the page. (Called by native code.) 133 * @param page 0-based page 134 * @param y y-offset onto page 135 * @param width width of area to render 136 * @param height height of area to render 137 * @param zoomFactor zoom factor to use when rendering data 138 * @param target target byte buffer to fill with results 139 * @return true if rendering was successful 140 */ 141 public boolean renderPageStripe(int page, int y, int width, int height, 142 double zoomFactor, ByteBuffer target) { 143 if (DEBUG) { 144 Log.d(TAG, "renderPageStripe() page=" + page + " y=" + y + " w=" + width + 145 " h=" + height + " zoom=" + zoomFactor); 146 } 147 if (mService == null) return false; 148 149 try { 150 long start = System.currentTimeMillis(); 151 ParcelFileDescriptor input = mService.renderPageStripe(page - 1, y, width, height, 152 zoomFactor); 153 154 // Copy received data into the ByteBuffer 155 int expectedSize = width * height * 3; 156 byte[] readBuffer = new byte[128 * 1024]; 157 try (InputStream in = new ParcelFileDescriptor.AutoCloseInputStream(input)) { 158 int length; 159 while((length = in.read(readBuffer, 0, readBuffer.length)) > 0) { 160 target.put(readBuffer, 0, length); 161 } 162 } 163 if (target.position() != expectedSize) { 164 Log.w(TAG, "Render failed: expected " + target.position() + ", got " + 165 expectedSize + " bytes"); 166 return false; 167 } 168 169 if (DEBUG) Log.d(TAG, "Received (" + (System.currentTimeMillis() - start) + "ms)"); 170 return true; 171 } catch (RemoteException | IOException | IllegalArgumentException | OutOfMemoryError ex) { 172 Log.w(TAG, "Render failed", ex); 173 return false; 174 } 175 } 176 177 /** 178 * Releases any open resources for the current document and page. 179 */ 180 public void closeDocument() { 181 if (DEBUG) Log.d(TAG, "closeDocument()"); 182 if (mService == null) return; 183 184 try { 185 mService.closeDocument(); 186 } catch (RemoteException ignored) { 187 } 188 } 189 }