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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.webkit;
import android.graphics.Point;
import android.webkit.WebViewCore.DrawData;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* @hide
*/
class ViewStateSerializer {
private static final int WORKING_STREAM_STORAGE = 16 * 1024;
// VERSION = 1 was for pictures encoded using a previous copy of libskia
static final int VERSION = 2;
static boolean serializeViewState(OutputStream stream, DrawData draw)
throws IOException {
int baseLayer = draw.mBaseLayer;
if (baseLayer == 0) {
return false;
}
DataOutputStream dos = new DataOutputStream(stream);
dos.writeInt(VERSION);
dos.writeInt(draw.mContentSize.x);
dos.writeInt(draw.mContentSize.y);
return nativeSerializeViewState(baseLayer, dos,
new byte[WORKING_STREAM_STORAGE]);
}
static DrawData deserializeViewState(InputStream stream)
throws IOException {
DataInputStream dis = new DataInputStream(stream);
int version = dis.readInt();
if (version > VERSION) {
throw new IOException("Unexpected version: " + version);
}
int contentWidth = dis.readInt();
int contentHeight = dis.readInt();
int baseLayer = nativeDeserializeViewState(version, dis,
new byte[WORKING_STREAM_STORAGE]);
final WebViewCore.DrawData draw = new WebViewCore.DrawData();
draw.mViewState = new WebViewCore.ViewState();
draw.mContentSize = new Point(contentWidth, contentHeight);
draw.mBaseLayer = baseLayer;
stream.close();
return draw;
}
public static void dumpLayerHierarchy(int baseLayer, OutputStream out, int level) {
nativeDumpLayerHierarchy(baseLayer, level, out,
new byte[WORKING_STREAM_STORAGE]);
}
private static native void nativeDumpLayerHierarchy(int baseLayer, int level,
OutputStream out, byte[] storage);
private static native boolean nativeSerializeViewState(int baseLayer,
OutputStream stream, byte[] storage);
// Returns a pointer to the BaseLayer
private static native int nativeDeserializeViewState(int version,
InputStream stream, byte[] storage);
private ViewStateSerializer() {}
}
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