/// <summary>
/// Deserializes the given stream into a primitive source.
/// </summary>
/// <param name="stream"></param>
/// <param name="compress"></param>
/// <param name="metaData"></param>
/// <returns></returns>
public static Primitive2DSource Deserialize(Stream stream, bool compress, out TagsCollectionBase metaData)
{
RuntimeTypeModel typeModel = SceneSerializer.BuildRuntimeTypeModel();
// [MetaIndexLenght:4][Metadata][SeneIndexLength:4][SceneIndex][SceneLengths:4*zoomFactors.length][Scenes]
// MetaIndexLenght: int The lenght of the meta index.
// Metadata: a number of serialized tags.
// SceneIndexLength: int The length of the sceneindex in bytes.
// SceneIndex: the serialized scene index.
// SceneLengths: int[] The lengths of the scenes per zoom level as in the zoomfactors array.
// Scenes: The serialized scenes themselves.
// read metaLength.
metaData = (new TagsCollectionSerializer()).DeserializeWithSize(stream);
// read SeneIndexLength.
var intBytes = new byte[4];
stream.Read(intBytes, 0, 4);
int indexLength = BitConverter.ToInt32(intBytes, 0);
// read SceneIndex
byte[] indexBytes = new byte[indexLength];
stream.Read(indexBytes, 0, indexLength);
MemoryStream indexStream = new MemoryStream(indexBytes);
SceneIndex sceneIndex = typeModel.Deserialize(indexStream, null, typeof(SceneIndex)) as SceneIndex;
// read SceneLengths
int[] lengths = new int[sceneIndex.ZoomFactors.Length];
for (int idx = 0; idx < lengths.Length; idx++)
{
stream.Read(intBytes, 0, 4);
lengths[idx] = BitConverter.ToInt32(intBytes, 0);
}
// create the deserializers.
int start = (int)stream.Position;
ISpatialIndexReadonly <Primitive2D>[] rTrees = new ISpatialIndexReadonly <Primitive2D> [lengths.Length];
for (int idx = 0; idx < lengths.Length; idx++)
{
Primitive2DRTreeDeserializer deserializer = new Primitive2DRTreeDeserializer(
sceneIndex, compress, SceneSerializer.CalculateScaleFactor(sceneIndex.ZoomFactors[idx]));
long position = stream.Position;
rTrees[idx] = deserializer.Deserialize(new LimitedStream(stream), true);
stream.Seek(position + lengths[idx], SeekOrigin.Begin);
}
return(new Primitive2DSource(sceneIndex.ZoomFactors, rTrees));
}
/// <summary>
/// Serializes the given scene.
/// </summary>
/// <param name="stream"></param>
/// <param name="scene"></param>
/// <param name="compress"></param>
public static void Serialize(Stream stream, TagsCollectionBase metaTags, Scene2D scene, bool compress)
{
RuntimeTypeModel typeModel = SceneSerializer.BuildRuntimeTypeModel();
// [MetaIndexLenght:4][Metadata][SeneIndexLength:4][SceneIndex][SceneLengths:4*zoomFactors.length][Scenes]
// MetaIndexLenght: int The lenght of the meta index.
// Metadata: a number of serialized tags.
// SceneIndexLength: int The length of the sceneindex in bytes.
// SceneIndex: the serialized scene index.
// SceneLengths: int[] The lengths of the scenes per zoom level as in the zoomfactors array.
// Scenes: The serialized scenes themselves.
// serialize meta tags.
byte[] tagsBytes = (new TagsCollectionSerializer()).Serialize(metaTags);
stream.Write(BitConverter.GetBytes(tagsBytes.Length), 0, 4);
stream.Write(tagsBytes, 0, tagsBytes.Length);
// index index.
SceneIndex sceneIndex = new SceneIndex();
sceneIndex.LineStyles = scene.GetStyleLines();
sceneIndex.PointStyles = scene.GetStylePoints();
sceneIndex.PolygonStyles = scene.GetStylePolygons();
sceneIndex.TextStyles = scene.GetStyleTexts();
sceneIndex.ZoomRanges = scene.GetZoomRanges();
sceneIndex.ZoomFactors = scene.GetZoomFactors();
sceneIndex.IconImage = scene.GetImages();
// write SceneIndex
long positionAfterMeta = stream.Position;
stream.Seek(positionAfterMeta + 4, SeekOrigin.Begin);
long indexStart = stream.Position;
typeModel.Serialize(stream, sceneIndex);
// write SeneIndexLength
int indexSize = (int)(stream.Position - indexStart);
stream.Seek(positionAfterMeta + 0, SeekOrigin.Begin);
stream.Write(BitConverter.GetBytes(indexSize), 0, 4);
// write Scenes.
stream.Seek(positionAfterMeta + 4 + indexSize + 4 * sceneIndex.ZoomFactors.Length, SeekOrigin.Begin);
// index into r-trees and serialize.
int[] lengths = new int[sceneIndex.ZoomFactors.Length];
for (int idx = 0; idx < lengths.Length; idx++)
{
long position = stream.Position;
Dictionary <uint, SceneObject> sceneAtZoom = scene.GetObjectsAt(idx);
RTreeMemoryIndex <SceneObject> memoryIndex = new RTreeMemoryIndex <SceneObject>();
float latestProgress = 0;
int sceneObjectIdx = 0;
foreach (KeyValuePair <uint, SceneObject> sceneObjectPair in sceneAtZoom)
{ // loop over all primitives in order.
SceneObject sceneObject = sceneObjectPair.Value;
uint id = sceneObjectPair.Key;
switch (sceneObject.Enum)
{
case SceneObjectType.IconObject:
case SceneObjectType.PointObject:
case SceneObjectType.TextObject:
OsmSharp.UI.Renderer.Scene.Scene2D.ScenePoint geo = scene.GetPoint(sceneObject.GeoId);
PointF2D point = new PointF2D(geo.X, geo.Y);
memoryIndex.Add(new BoxF2D(point), sceneObject);
break;
case SceneObjectType.LineObject:
case SceneObjectType.LineTextObject:
case SceneObjectType.PolygonObject:
OsmSharp.UI.Renderer.Scene.Scene2D.ScenePoints geos = scene.GetPoints(sceneObject.GeoId);
memoryIndex.Add(new BoxF2D(geos.X, geos.Y), sceneObject);
break;
}
float progress = (float)System.Math.Round((((double)sceneObjectIdx / (double)sceneAtZoom.Count) * 100));
if (progress != latestProgress)
{
OsmSharp.Logging.Log.TraceEvent("SceneSerializer", OsmSharp.Logging.TraceEventType.Information,
"Indexing scene objects at zoom {1} ({2}/{3})... {0}%", progress, sceneIndex.ZoomFactors[idx],
sceneObjectIdx, sceneAtZoom.Count);
latestProgress = progress;
}
sceneObjectIdx++;
}
// serialize the r-tree.
OsmSharp.Logging.Log.TraceEvent("SceneSerializer", OsmSharp.Logging.TraceEventType.Information,
"Serializing RTRee...");
SceneObjectRTreeSerializer memoryIndexSerializer = new SceneObjectRTreeSerializer(
scene, compress, idx, SceneSerializer.CalculateScaleFactor(sceneIndex.ZoomFactors[idx]));
memoryIndexSerializer.Serialize(new LimitedStream(stream), memoryIndex);
lengths[idx] = (int)(stream.Position - position);
}
// write SceneLengths
long end = stream.Position;
stream.Seek(positionAfterMeta + 4 + indexSize, SeekOrigin.Begin);
for (int idx = 0; idx < lengths.Length; idx++)
{
stream.Write(BitConverter.GetBytes(lengths[idx]), 0, 4);
}
stream.Seek(end, SeekOrigin.Begin);
}