// Licensed to the .NET Foundation under one or more agreements. // The .NET Foundation licenses this file to you under the MIT license. // See the LICENSE file in the project root for more information. // // Description: Utilities for converting types to custom Binary format // using System; using System.IO; #if PRESENTATION_CORE using MS.Internal.PresentationCore; #elif PRESENTATIONFRAMEWORK using MS.Internal.PresentationFramework; #endif #if PBTCOMPILER using System.Collections.Generic; using TypeConverterHelper = MS.Internal.Markup; namespace MS.Internal.Markup #else using System.Windows; using System.Windows.Media; using System.Windows.Media.Media3D; using TypeConverterHelper = System.Windows.Markup; namespace MS.Internal.Media #endif { #if PBTCOMPILER // // Internal class used during serialization of Point3D, or Vectors. // // We define this struct so that we can create a collection of types during serialization. // If we used defined avalon types, like Point & Vector, we'd have to bring these into PBT // with a compiler change everytime these types are changed. // // The type is called "ThreeDoubles" to make clear what it is and what it's for. // // If either Vector3D or Point3D changes - we will need to change this code. // internal class ThreeDoublesMarkup { internal ThreeDoublesMarkup( double X, double Y, double Z) { _x = X; _y = Y; _z = Z; } internal double X { get { return _x; } } internal double Y { get { return _y; } } internal double Z { get { return _z; } } double _x ; double _y ; double _z ; } internal struct Point { internal Point(double x, double y) { _x = x; _y = y; } internal double X { set { _x = value; } get { return _x; } } internal double Y { set { _y = value; } get { return _y; } } private double _x; private double _y; } internal struct Size { internal Size(double width, double height) { _width = width; _height = height; } internal double Width { set { _width = value; } get { return _width; } } internal double Height { set { _height = value; } get { return _height; } } private double _width; private double _height; } #endif internal static class XamlSerializationHelper { // ===================================================== // // All PBT specific types and methods go here. // // ====================================================== internal enum SerializationFloatType : byte { Unknown = 0, Zero = 1, One = 2, MinusOne = 3, ScaledInteger = 4, Double = 5, Other } ///<summary> /// Serialize this object using the passed writer in compact BAML binary format. ///</summary> /// <remarks> /// This is called ONLY from the Parser and is not a general public method. /// </remarks> internal static bool SerializePoint3D(BinaryWriter writer, string stringValues) { #if PBTCOMPILER List<ThreeDoublesMarkup> point3Ds = ParseThreeDoublesCollection(stringValues, TypeConverterHelper.InvariantEnglishUS); ThreeDoublesMarkup curPoint; #else Point3DCollection point3Ds = Point3DCollection.Parse( stringValues ) ; Point3D curPoint ; #endif // Write out the size. writer.Write( ( uint ) point3Ds.Count ) ; // Write out the doubles. for ( int i = 0; i < point3Ds.Count ; i ++ ) { curPoint = point3Ds[i] ; WriteDouble( writer, curPoint.X); WriteDouble( writer, curPoint.Y); WriteDouble( writer, curPoint.Z); } return true ; } ///<summary> /// Serialize this object using the passed writer in compact BAML binary format. ///</summary> /// <remarks> /// This is called ONLY from the Parser and is not a general public method. /// </remarks> internal static bool SerializeVector3D(BinaryWriter writer, string stringValues) { #if PBTCOMPILER List<ThreeDoublesMarkup> points = ParseThreeDoublesCollection(stringValues, TypeConverterHelper.InvariantEnglishUS); ThreeDoublesMarkup curPoint; #else Vector3DCollection points = Vector3DCollection.Parse( stringValues ) ; Vector3D curPoint ; #endif // Write out the size. writer.Write( ( uint ) points.Count ) ; // Write out the doubles. for ( int i = 0; i < points.Count ; i ++ ) { curPoint = points[ i ] ; WriteDouble( writer, curPoint.X); WriteDouble( writer, curPoint.Y); WriteDouble( writer, curPoint.Z); } return true ; } ///<summary> /// Serialize this object using the passed writer in compact BAML binary format. ///</summary> /// <remarks> /// This is called ONLY from the Parser and is not a general public method. /// </remarks> internal static bool SerializePoint(BinaryWriter writer, string stringValue) { #if PBTCOMPILER List<Point> points = ParsePointCollection(stringValue, TypeConverterHelper.InvariantEnglishUS); Point curPoint; #else PointCollection points = PointCollection.Parse( stringValue ) ; Point curPoint ; #endif // Write out the size. writer.Write( ( uint ) points.Count ) ; // Write out the doubles. for ( int i = 0; i < points.Count ; i ++ ) { curPoint = points[ i ] ; WriteDouble( writer, curPoint.X); WriteDouble( writer, curPoint.Y); } return true ; } private const double scaleFactor = 1000000 ; // approx == 2^20 private const double inverseScaleFactor = 0.000001 ; // approx = 1 / 2^20 // // Write a double into our internal binary format // // // The format is : // <Byte indicating enum type> ( <4 bytes for scaledinteger> | < 8 bytes for double> ) // internal static void WriteDouble( BinaryWriter writer, Double value ) { if ( value == 0.0 ) { writer.Write( (byte) SerializationFloatType.Zero ) ; } else if ( value == 1.0 ) { writer.Write( (byte) SerializationFloatType.One ) ; } else if ( value == -1.0 ) { writer.Write( (byte) SerializationFloatType.MinusOne ) ; } else { int intValue = 0 ; if ( CanConvertToInteger( value, ref intValue ) ) { writer.Write( (byte) SerializationFloatType.ScaledInteger ) ; writer.Write( intValue ) ; } else { writer.Write( (byte) SerializationFloatType.Double ) ; writer.Write( value ) ; } } } #if !PBTCOMPILER // // Read a double from our internal binary format. // We assume that the binary reader is at the start of a byte. // internal static double ReadDouble( BinaryReader reader ) { SerializationFloatType type = ( SerializationFloatType ) reader.ReadByte(); switch( type ) { case SerializationFloatType.Zero : return 0.0 ; case SerializationFloatType.One : return 1.0 ; case SerializationFloatType.MinusOne : return -1.0 ; case SerializationFloatType.ScaledInteger : return ReadScaledInteger( reader ); case SerializationFloatType.Double : return reader.ReadDouble(); default: throw new ArgumentException(SR.FloatUnknownBamlType); } } internal static double ReadScaledInteger(BinaryReader reader ) { double value = (double) reader.ReadInt32(); value = value * inverseScaleFactor ; return value ; } #endif #if PBTCOMPILER /// <summary> /// Parse - returns an instance converted from the provided string. /// <param name="source"> string with Point3DCollection data </param> /// <param name="formatProvider">IFormatprovider for processing string</param> /// </summary> private static List<ThreeDoublesMarkup> ParseThreeDoublesCollection(string source, IFormatProvider formatProvider) { TokenizerHelper th = new TokenizerHelper(source, formatProvider); List<ThreeDoublesMarkup> resource = new List<ThreeDoublesMarkup>( source.Length/ 8 ) ; // SWAG the length of the collection. ThreeDoublesMarkup value; while (th.NextToken()) { value = new ThreeDoublesMarkup( Convert.ToDouble(th.GetCurrentToken(), formatProvider), Convert.ToDouble(th.NextTokenRequired(), formatProvider), Convert.ToDouble(th.NextTokenRequired(), formatProvider)); resource.Add(value); } return resource; } /// <summary> /// Parse - returns an instance converted from the provided string. /// <param name="source"> string with Point3DCollection data </param> /// <param name="formatProvider">IFormatprovider for processing string</param> /// </summary> private static List<Point> ParsePointCollection(string source, IFormatProvider formatProvider) { TokenizerHelper th = new TokenizerHelper(source, formatProvider); List<Point> resource = new List<Point>(source.Length/ 8 ); // SWAG the length of the collection. Point value; while (th.NextToken()) { value = new Point( Convert.ToDouble(th.GetCurrentToken(), formatProvider), Convert.ToDouble(th.NextTokenRequired(), formatProvider) ); resource.Add(value); } return resource; } #endif // // Can we convert this double to a "scaled integer" // // We multiply by approx 2^20 - see if the result is either // - greater than maxInt // - if there is a non-numeric integer remaining // // as a result this routine will convert doubles with six-digits precision between +/- 2048 // internal static bool CanConvertToInteger( Double doubleValue , ref int intValue ) { double scaledValue ; double scaledInteger ; scaledValue = doubleValue * scaleFactor ; scaledInteger = Math.Floor( scaledValue ) ; if ( !( scaledInteger <= Int32.MaxValue ) // equivalent to scaledInteger > MaxValue, but take care of NaN. || !( scaledInteger >= Int32.MinValue ) ) // equivalent to scaledInteger < Minvalue but take care of NaN. { return false ; } else if ( ( scaledValue - scaledInteger ) > Double.Epsilon ) { return false ; } else { intValue = (int) scaledValue ; return true ; } } } } |