FamilyTypeface.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / FamilyTypeface.cs / 1305600 / FamilyTypeface.cs
                        
                        
                            //+------------------------------------------------------------------------ 
//
//  Microsoft Windows Client Platform
//  Copyright (C) Microsoft Corporation, 2002
// 
//  File:      FamilyTypeface.cs
// 
//  Contents:  FamilyTypeface implementation 
//
//  Spec:      http://team/sites/Avalon/Specs/Fonts.htm 
//
//  Created:   11-11-2003 Tarek Mahmoud Sayed ([....])
//
//----------------------------------------------------------------------- 

using System; 
using System.Collections.Generic; 
using System.Globalization;
using System.ComponentModel; 
using System.Windows.Markup;    // for XmlLanguage
using MS.Internal.FontFace;
using System.Security;
using System.Security.Permissions; 

using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID; 

namespace System.Windows.Media 
{
    /// 
    /// The FamilyTypeface object specifies the details of a single typeface supported by a
    /// FontFamily. There are as many FamilyTypeface objects as there are typefaces supported. 
    /// 
    public class FamilyTypeface : IDeviceFont, ITypefaceMetrics 
    { 
        /// 
        /// Construct a default family typeface 
        /// 
        public FamilyTypeface()
        {}
 

        ///  
        /// Construct a read-only FamilyTypeface from a Typeface. 
        /// 
        internal FamilyTypeface(Typeface face) 
        {
            _style = face.Style;
            _weight = face.Weight;
            _stretch = face.Stretch; 
            _underlinePosition = face.UnderlinePosition;
            _underlineThickness = face.UnderlineThickness; 
            _strikeThroughPosition = face.StrikethroughPosition; 
            _strikeThroughThickness = face.StrikethroughThickness;
            _capsHeight = face.CapsHeight; 
            _xHeight = face.XHeight;
            _readOnly = true;
        }
 

        ///  
        /// Typeface style 
        /// 
        public FontStyle Style 
        {
            get { return _style;  }
            set
            { 
                VerifyChangeable();
                _style = value; 
            } 
        }
 

        /// 
        /// Typeface weight
        ///  
        public FontWeight Weight
        { 
            get { return _weight; } 
            set
            { 
                VerifyChangeable();
                _weight = value;
            }
        } 

 
        ///  
        /// Typeface stretch
        ///  
        public FontStretch Stretch
        {
            get { return _stretch;  }
            set 
            {
                VerifyChangeable(); 
                _stretch = value; 
            }
        } 


        /// 
        /// Typeface underline position in EM relative to baseline 
        /// 
        public double UnderlinePosition 
        { 
            get { return _underlinePosition ; }
            set 
            {
                CompositeFontParser.VerifyMultiplierOfEm("UnderlinePosition", ref value);
                VerifyChangeable();
                _underlinePosition = value; 
            }
        } 
 

        ///  
        /// Typeface underline thickness in EM
        /// 
        public  double UnderlineThickness
        { 
            get { return _underlineThickness; }
            set 
            { 
                CompositeFontParser.VerifyPositiveMultiplierOfEm("UnderlineThickness", ref value);
                VerifyChangeable(); 
                _underlineThickness = value;
            }
        }
 

        ///  
        /// Typeface strikethrough position in EM relative to baseline 
        /// 
        public double StrikethroughPosition 
        {
            get { return _strikeThroughPosition;  }
            set
            { 
                CompositeFontParser.VerifyMultiplierOfEm("StrikethroughPosition", ref value);
                VerifyChangeable(); 
                _strikeThroughPosition = value; 
            }
        } 


        /// 
        /// Typeface strikethrough thickness in EM 
        /// 
        public double StrikethroughThickness 
        { 
            get { return _strikeThroughThickness;  }
            set 
            {
                CompositeFontParser.VerifyPositiveMultiplierOfEm("StrikethroughThickness", ref value);
                VerifyChangeable();
                _strikeThroughThickness = value; 
            }
        } 
 

        ///  
        /// Typeface caps height in EM
        /// 
        public double CapsHeight
        { 
            get { return _capsHeight;  }
            set 
            { 
                CompositeFontParser.VerifyPositiveMultiplierOfEm("CapsHeight", ref value);
                VerifyChangeable(); 
                _capsHeight = value;
            }
        }
 
        /// 
        /// Typeface X-height in EM 
        ///  
        public double XHeight
        { 
            get { return _xHeight;  }
            set
            {
                CompositeFontParser.VerifyPositiveMultiplierOfEm("XHeight", ref value); 
                VerifyChangeable();
                _xHeight = value; 
            } 
        }
 
        /// 
        /// Flag indicate whether this is symbol typeface; always false for FamilyTypeface.
        /// 
        bool ITypefaceMetrics.Symbol 
        {
            get { return false; } 
        } 

        ///  
        /// Style simulation flags for this typeface.
        /// 
        StyleSimulations ITypefaceMetrics.StyleSimulations
        { 
            get
            { 
                return StyleSimulations.None; 
            }
        } 

        /// 
        /// Collection of localized face names adjusted by the font differentiator.
        ///  
        public IDictionary AdjustedFaceNames
        { 
            get 
            {
                return FontDifferentiator.ConstructFaceNamesByStyleWeightStretch(_style, _weight, _stretch); 
            }
        }

        ///  
        /// Compares two typefaces for equality; returns true if the specified typeface
        /// is not null and has the same properties as this typeface. 
        ///  
        public bool Equals(FamilyTypeface typeface)
        { 
            if (typeface == null)
                return false;

            return ( 
                 Style   == typeface.Style
              && Weight  == typeface.Weight 
              && Stretch == typeface.Stretch 
              );
        } 


        /// 
        /// Name or unique identifier of a device font. 
        /// 
        public string DeviceFontName 
        { 
            get { return _deviceFontName; }
            set 
            {
                VerifyChangeable();
                _deviceFontName = value;
            } 
        }
 
 
        /// 
        /// Collection of character metrics for a device font. 
        /// 
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public CharacterMetricsDictionary DeviceFontCharacterMetrics
        { 
            get
            { 
                if (_characterMetrics == null) 
                {
                    _characterMetrics = new CharacterMetricsDictionary(); 
                }
                return _characterMetrics;
            }
        } 

 
        ///  
        /// 
        ///  
        public override bool Equals(object o)
        {
            return Equals(o as FamilyTypeface);
        } 

        ///  
        ///  
        /// 
        public override int GetHashCode() 
        {
            return  _style.GetHashCode()
                  ^ _weight.GetHashCode()
                  ^ _stretch.GetHashCode(); 
        }
 
        private void VerifyChangeable() 
        {
            if (_readOnly) 
                throw new NotSupportedException(SR.Get(SRID.General_ObjectIsReadOnly));
        }

        string IDeviceFont.Name 
        {
            get { return _deviceFontName; } 
        } 

        bool IDeviceFont.ContainsCharacter(int unicodeScalar) 
        {
            return _characterMetrics != null && _characterMetrics.GetValue(unicodeScalar) != null;
        }
 

        ///  
        /// Critical - As it uses raw pointers. 
        /// 
        [SecurityCritical] 
        unsafe void IDeviceFont.GetAdvanceWidths(
            char*   characterString,
            int     characterLength,
            double  emSize, 
            int*    pAdvances
        ) 
        { 
            unsafe
            { 
                for (int i = 0; i < characterLength; ++i)
                {
                    CharacterMetrics metrics = _characterMetrics.GetValue(characterString[i]);
                    if (metrics != null) 
                    {
                        // Side bearings are included in the advance width but are not used as offsets for glyph positioning. 
                        pAdvances[i] = Math.Max(0, (int)((metrics.BlackBoxWidth + metrics.LeftSideBearing + metrics.RightSideBearing) * emSize)); 
                    }
                    else 
                    {
                        pAdvances[i] = 0;
                    }
                } 
            }
        } 
 

 

        private bool            _readOnly;
        private FontStyle       _style;
        private FontWeight      _weight; 
        private FontStretch     _stretch;
        private double          _underlinePosition; 
        private double          _underlineThickness; 
        private double          _strikeThroughPosition;
        private double          _strikeThroughThickness; 
        private double          _capsHeight;
        private double          _xHeight;
        private string          _deviceFontName;
        private CharacterMetricsDictionary _characterMetrics; 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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