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      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