1 /* 2 * Copyright (C) 2011 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 package android.webkit; 17 18 import android.graphics.Point; 19 import android.webkit.WebViewCore.DrawData; 20 21 import java.io.DataInputStream; 22 import java.io.DataOutputStream; 23 import java.io.IOException; 24 import java.io.InputStream; 25 import java.io.OutputStream; 26 27 /** 28 * @hide 29 */ 30 class ViewStateSerializer { 31 32 private static final int WORKING_STREAM_STORAGE = 16 * 1024; 33 34 static final int VERSION = 1; 35 36 static boolean serializeViewState(OutputStream stream, DrawData draw) 37 throws IOException { 38 int baseLayer = draw.mBaseLayer; 39 if (baseLayer == 0) { 40 return false; 41 } 42 DataOutputStream dos = new DataOutputStream(stream); 43 dos.writeInt(VERSION); 44 dos.writeInt(draw.mContentSize.x); 45 dos.writeInt(draw.mContentSize.y); 46 return nativeSerializeViewState(baseLayer, dos, 47 new byte[WORKING_STREAM_STORAGE]); 48 } 49 50 static DrawData deserializeViewState(InputStream stream) 51 throws IOException { 52 DataInputStream dis = new DataInputStream(stream); 53 int version = dis.readInt(); 54 if (version > VERSION) { 55 throw new IOException("Unexpected version: " + version); 56 } 57 int contentWidth = dis.readInt(); 58 int contentHeight = dis.readInt(); 59 int baseLayer = nativeDeserializeViewState(version, dis, 60 new byte[WORKING_STREAM_STORAGE]); 61 62 final WebViewCore.DrawData draw = new WebViewCore.DrawData(); 63 draw.mViewState = new WebViewCore.ViewState(); 64 draw.mContentSize = new Point(contentWidth, contentHeight); 65 draw.mBaseLayer = baseLayer; 66 stream.close(); 67 return draw; 68 } 69 70 public static void dumpLayerHierarchy(int baseLayer, OutputStream out, int level) { 71 nativeDumpLayerHierarchy(baseLayer, level, out, 72 new byte[WORKING_STREAM_STORAGE]); 73 } 74 75 76 private static native void nativeDumpLayerHierarchy(int baseLayer, int level, 77 OutputStream out, byte[] storage); 78 79 private static native boolean nativeSerializeViewState(int baseLayer, 80 OutputStream stream, byte[] storage); 81 82 // Returns a pointer to the BaseLayer 83 private static native int nativeDeserializeViewState(int version, 84 InputStream stream, byte[] storage); 85 86 private ViewStateSerializer() {} 87 } 88