Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Shaping / CompositeFontFamily.cs / 1305600 / CompositeFontFamily.cs
//------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation, 2002 // // File: CompositeFontFamily.cs // // Contents: Composite font family // // Created: 5-25-2003 Worachai Chaoweeraprasit (wchao) // //----------------------------------------------------------------------- using System; using System.Globalization; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Security; using System.Windows; using System.Windows.Markup; // for XmlLanguage using System.Windows.Media; using System.Windows.Media.TextFormatting; using MS.Internal.FontCache; using MS.Internal.FontFace; using MS.Internal.TextFormatting; using FontFamily = System.Windows.Media.FontFamily; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace MS.Internal.Shaping { ////// Composite font family /// internal sealed class CompositeFontFamily : IFontFamily { private readonly CompositeFontInfo _fontInfo; private IFontFamily _firstFontFamily; #region Constructors ////// Construct a default composite font family /// internal CompositeFontFamily() : this(new CompositeFontInfo()) {} ////// Construct a composite font family from composite font info /// internal CompositeFontFamily(CompositeFontInfo fontInfo) { _fontInfo = fontInfo; } ////// Construct a composite font family with a single target family name /// internal CompositeFontFamily( string friendlyName ) : this( friendlyName, null // firstFontFamily ) {} ////// Construct a composite font family with a single target family name /// after the first font family in the target family is known /// ////// Critical - as this accesses _firstFontFamily which is marked critical. /// Safe - as this doesn't expose it. /// [SecurityCritical, SecurityTreatAsSafe] internal CompositeFontFamily( string friendlyName, IFontFamily firstFontFamily ) : this() { FamilyMaps.Add( new FontFamilyMap( 0, FontFamilyMap.LastUnicodeScalar, null, // any language friendlyName, 1 // scaleInEm ) ); _firstFontFamily = firstFontFamily; } #endregion #region IFontFamily properties ////// Font family name table indexed by culture /// IDictionaryIFontFamily.Names { get { return _fontInfo.FamilyNames; } } /// /// Distance from character cell top to English baseline relative to em size. /// public double Baseline(double emSize, double toReal, double pixelsPerDip, TextFormattingMode textFormattingMode) { if (textFormattingMode == TextFormattingMode.Ideal) { return ((IFontFamily)this).BaselineDesign * emSize; } else { // If the composite font has a pre specified Baseline then we respect it in calculating the // baseline but we round it since Compatible metrics are pixel aligned. if (_fontInfo.Baseline != 0) { return Math.Round(_fontInfo.Baseline * emSize); } // If the composite font has no specifed Baseline then we get the compatible font metrics of the // first fontfamily in the composite font. else { return GetFirstFontFamily().Baseline(emSize, toReal, pixelsPerDip, textFormattingMode); } } } public void SetBaseline(double value) { _fontInfo.Baseline = value; } ////// Recommended baseline-to-baseline distance for text in this font. /// public double LineSpacing(double emSize, double toReal, double pixelsPerDip, TextFormattingMode textFormattingMode) { if (textFormattingMode == TextFormattingMode.Ideal) { return ((IFontFamily)this).LineSpacingDesign * emSize; } else { // If the composite font has a pre specified LineSpacing then we respect it in calculating the // linespacing but we round it since Compatible metrics are pixel aligned. if (_fontInfo.LineSpacing != 0) { return Math.Round(_fontInfo.LineSpacing * emSize); } // If the composite font has no specifed LineSpacing then we get the compatible font metrics of the // first fontfamily in the composite font. else { return GetFirstFontFamily().LineSpacing(emSize, toReal, pixelsPerDip, textFormattingMode); } } } double IFontFamily.BaselineDesign { get { if (_fontInfo.Baseline == 0) { _fontInfo.Baseline = GetFirstFontFamily().BaselineDesign; } return _fontInfo.Baseline; } } double IFontFamily.LineSpacingDesign { get { if (_fontInfo.LineSpacing == 0) { _fontInfo.LineSpacing = GetFirstFontFamily().LineSpacingDesign; } return _fontInfo.LineSpacing; } } public void SetLineSpacing(double value) { _fontInfo.LineSpacing = value; } ////// Get typeface metrics of the specified typeface /// ITypefaceMetrics IFontFamily.GetTypefaceMetrics( FontStyle style, FontWeight weight, FontStretch stretch ) { if (_fontInfo.FamilyTypefaces == null && _fontInfo.FamilyMaps.Count == 1 && _fontInfo.FamilyMaps[0].IsSimpleFamilyMap) { // Typical e.g. "MyFont, sans-serif" return GetFirstFontFamily().GetTypefaceMetrics(style, weight, stretch); } return FindTypefaceMetrics(style, weight, stretch); } ////// Look up device font for the typeface. /// IDeviceFont IFontFamily.GetDeviceFont(FontStyle style, FontWeight weight, FontStretch stretch) { FamilyTypeface bestFace = FindExactFamilyTypeface(style, weight, stretch); if (bestFace != null && bestFace.DeviceFontName != null) return bestFace; else return null; } ////// Get family name correspondent to the first n-characters of the specified character string /// bool IFontFamily.GetMapTargetFamilyNameAndScale( CharacterBufferRange unicodeString, CultureInfo culture, CultureInfo digitCulture, double defaultSizeInEm, out int cchAdvance, out string targetFamilyName, out double scaleInEm ) { Invariant.Assert(unicodeString.CharacterBuffer != null && unicodeString.Length > 0); Invariant.Assert(culture != null); // Get the family map. This will find the first family map that matches // the specified culture, an ancestor neutral culture, or "any" culture. FontFamilyMap familyMap = GetTargetFamilyMap( unicodeString, culture, digitCulture, out cchAdvance ); // Return the values for the matching FontFamilyMap. If there is none this is // FontFamilyMap.Default which has Target == null and Scale == 1.0. targetFamilyName = familyMap.Target; scaleInEm = familyMap.Scale; return true; } ICollectionIFontFamily.GetTypefaces(FontFamilyIdentifier familyIdentifier) { return new TypefaceCollection(new FontFamily(familyIdentifier), FamilyTypefaces); } #endregion #region collections exposed by FontFamily internal LanguageSpecificStringDictionary FamilyNames { get { return _fontInfo.FamilyNames; } } internal FamilyTypefaceCollection FamilyTypefaces { get { return _fontInfo.GetFamilyTypefaceList(); } } internal FontFamilyMapCollection FamilyMaps { get { return _fontInfo.FamilyMaps; } } #endregion private FontFamilyMap GetTargetFamilyMap( CharacterBufferRange unicodeString, CultureInfo culture, CultureInfo digitCulture, out int cchAdvance ) { DigitMap digitMap = new DigitMap(digitCulture); ushort[] familyMaps = _fontInfo.GetFamilyMapsOfLanguage(XmlLanguage.GetLanguage(culture.IetfLanguageTag)); int sizeofChar = 0; int ch = 0; // skip all the leading joinder characters. They need to be shaped with the // surrounding strong characters. cchAdvance = Classification.AdvanceWhile(unicodeString, ItemClass.JoinerClass); if (cchAdvance >= unicodeString.Length) { // It is rare that the run only contains joiner characters. // If it really happens, just map them to the initial family map. return _fontInfo.GetFamilyMapOfChar( familyMaps, Classification.UnicodeScalar(unicodeString, out sizeofChar) ); } // // If the run starts with combining marks, we will not be able to find base characters for them // within the run. These combining marks will be mapped to their best fonts as normal characters. // ch = Classification.UnicodeScalar( new CharacterBufferRange(unicodeString, cchAdvance, unicodeString.Length - cchAdvance), out sizeofChar ); bool hasBaseChar = !Classification.IsCombining(ch); ch = digitMap[ch]; FontFamilyMap familyMap = _fontInfo.GetFamilyMapOfChar(familyMaps, ch); Invariant.Assert(familyMap != null); for (cchAdvance += sizeofChar; cchAdvance < unicodeString.Length; cchAdvance += sizeofChar) { ch = Classification.UnicodeScalar( new CharacterBufferRange(unicodeString, cchAdvance, unicodeString.Length - cchAdvance), out sizeofChar ); if (Classification.IsJoiner(ch)) continue; // continue to advance if current char is a joiner if (!Classification.IsCombining(ch)) { hasBaseChar = true; } else if (hasBaseChar) { continue; // continue to advance for combining mark with base char } ch = digitMap[ch]; if (_fontInfo.GetFamilyMapOfChar(familyMaps, ch) != familyMap) break; } return familyMap; } /// /// Get the first font family of the first target family name /// private IFontFamily GetFirstFontFamily() { if(_firstFontFamily == null) { if (_fontInfo.FamilyMaps.Count != 0) { _firstFontFamily = FontFamily.FindFontFamilyFromFriendlyNameList(_fontInfo.FamilyMaps[0].Target); } else { _firstFontFamily = FontFamily.LookupFontFamily(FontFamily.NullFontFamilyCanonicalName); } Invariant.Assert(_firstFontFamily != null); } return _firstFontFamily; } private ITypefaceMetrics FindTypefaceMetrics( FontStyle style, FontWeight weight, FontStretch stretch ) { FamilyTypeface bestFace = FindNearestFamilyTypeface(style, weight, stretch); if (bestFace == null) return new CompositeTypefaceMetrics(); else return bestFace; } ////// Find the face closest to the specified style, weight and stretch. /// Returns null if there is no matching face. /// private FamilyTypeface FindNearestFamilyTypeface( FontStyle style, FontWeight weight, FontStretch stretch ) { if (_fontInfo.FamilyTypefaces == null || _fontInfo.FamilyTypefaces.Count == 0) { return null; } FamilyTypeface bestFace = (FamilyTypeface)_fontInfo.FamilyTypefaces[0]; MatchingStyle bestMatch = new MatchingStyle(bestFace.Style, bestFace.Weight, bestFace.Stretch); MatchingStyle target = new MatchingStyle(style, weight, stretch); for (int i = 1; i < _fontInfo.FamilyTypefaces.Count; i++) { FamilyTypeface currentFace = (FamilyTypeface)_fontInfo.FamilyTypefaces[i]; MatchingStyle currentMatch = new MatchingStyle(currentFace.Style, currentFace.Weight, currentFace.Stretch); if (MatchingStyle.IsBetterMatch(target, bestMatch, ref currentMatch)) { bestFace = currentFace; bestMatch = currentMatch; } } return bestFace; } ////// Find the face exactly matching the specified style, weight and stretch. /// Returns null if there is no matching face. /// private FamilyTypeface FindExactFamilyTypeface( FontStyle style, FontWeight weight, FontStretch stretch ) { if (_fontInfo.FamilyTypefaces == null || _fontInfo.FamilyTypefaces.Count == 0) { return null; } MatchingStyle target = new MatchingStyle(style, weight, stretch); foreach (FamilyTypeface currentFace in _fontInfo.FamilyTypefaces) { MatchingStyle currentMatch = new MatchingStyle(currentFace.Style, currentFace.Weight, currentFace.Stretch); if (currentMatch == target) { return currentFace; } } return null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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