Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / FontFamily.cs / 1599981 / FontFamily.cs
//------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation, 2002 // // File: FontFamily.cs // // Contents: FontFamily // // Created : 5-25-2003 Worachai Chaoweeraprasit (wchao) // Modified : 8-08-2008 [....] - Integrating with DWrite. // //----------------------------------------------------------------------- using System; using System.Text; using System.IO; using System.Globalization; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Windows; using System.Windows.Markup; // for XmlLanguage using System.ComponentModel; using System.ComponentModel.Design; using MS.Utility; using MS.Internal; using MS.Internal.FontCache; using MS.Internal.FontFace; using MS.Internal.Shaping; using System.Security; using SR = MS.Internal.PresentationCore.SR; using SRID = MS.Internal.PresentationCore.SRID; // Since we disable PreSharp warnings in this file, we first need to disable warnings about unknown message numbers and unknown pragmas. #pragma warning disable 1634, 1691 namespace System.Windows.Media { ////// Represents a family of related fonts. Fonts in a FontFamily differ only in style, /// weight, or stretch. /// [TypeConverter(typeof(FontFamilyConverter))] [ValueSerializer(typeof(FontFamilyValueSerializer))] [Localizability(LocalizationCategory.Font)] public class FontFamily { ////// Family name originally passed to by user and information derived from it. /// private FontFamilyIdentifier _familyIdentifier; ////// The first valid font family. If no valid font family can be resolved from /// the given name, this will point to a NullFontFamily object. /// private IFontFamily _firstFontFamily; ////// Null font is the font that has metrics but logically does not support any Unicode codepoint /// so whatever text we throw at it would result in being mapped to missing glyph. /// internal static readonly CanonicalFontFamilyReference NullFontFamilyCanonicalName = CanonicalFontFamilyReference.Create(null, "#ARIAL"); internal const string GlobalUI = "#GLOBAL USER INTERFACE"; internal static FontFamily FontFamilyGlobalUI = new FontFamily(GlobalUI); private static volatile FamilyCollection _defaultFamilyCollection = PreCreateDefaultFamilyCollection(); private static FontFamilyMapCollection _emptyFamilyMaps = null; ////// Constructs FontFamily from a string. /// /// Specifies one or more comma-separated family names, each /// of which may be either a regular family name string (e.g., "Arial") or a URI /// (e.g., "file:///c:/windows/fonts/#Arial"). public FontFamily(string familyName) : this(null, familyName) {} ////// Constructs FontFamily from a string and an optional base URI. /// /// Specifies the base URI used to resolve family names, typically /// the URI of the document or element that refers to the font family. Can be null. /// Specifies one or more comma-separated family names, each /// of which may be either a regular family name string (e.g., "Arial") or a URI /// (e.g., "file:///c:/windows/fonts/#Arial"). public FontFamily(Uri baseUri, string familyName) { if (familyName == null) throw new ArgumentNullException("familyName"); if (baseUri != null && !baseUri.IsAbsoluteUri) throw new ArgumentException(SR.Get(SRID.UriNotAbsolute), "baseUri"); _familyIdentifier = new FontFamilyIdentifier(familyName, baseUri); } internal FontFamily(FontFamilyIdentifier familyIdentifier) { _familyIdentifier = familyIdentifier; } ////// Construct an anonymous font family, i.e., a composite font that is created /// programatically instead of referenced by name or URI. /// public FontFamily() { _familyIdentifier = new FontFamilyIdentifier(null, null); _firstFontFamily = new CompositeFontFamily(); } ////// Collection of culture-dependant family names. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public LanguageSpecificStringDictionary FamilyNames { get { CompositeFontFamily compositeFont = FirstFontFamily as CompositeFontFamily; if (compositeFont != null) { // Return the read/write dictionary of family names. return compositeFont.FamilyNames; } else { // Return a wrapper for the cached family's read-only dictionary. return new LanguageSpecificStringDictionary(FirstFontFamily.Names); } } } ////// List of FamilyTypeface objects. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public FamilyTypefaceCollection FamilyTypefaces { get { CompositeFontFamily compositeFont = FirstFontFamily as CompositeFontFamily; if (compositeFont != null) { // Return the read/write list of typefaces for the font. return compositeFont.FamilyTypefaces; } else { // Return a wrapper for the read-only collection of typefaces. return new FamilyTypefaceCollection(FirstFontFamily.GetTypefaces(_familyIdentifier)); } } } ////// Collection of FontFamilyMap objects for an anonymous font family. For named font /// families, this property returns an empty, read-only list. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public FontFamilyMapCollection FamilyMaps { get { CompositeFontFamily compositeFont = FirstFontFamily as CompositeFontFamily; if (compositeFont != null) { // Read the read/write list of family maps for the font. return compositeFont.FamilyMaps; } else { // Return an empty, read-only collection of FamilyMaps. if (_emptyFamilyMaps == null) { _emptyFamilyMaps = new FontFamilyMapCollection(null); } return _emptyFamilyMaps; } } } ////// Family names and/or URIs used to construct the font family. /// public string Source { get { return _familyIdentifier.Source; } } ////// Base URI used to resolve family names, typically the URI of the document or element /// that refers to the font family. /// ////// Family names are interpreted first relative to the base URI (if not null) and then /// relative to the default folder for installed fonts. /// public Uri BaseUri { get { return _familyIdentifier.BaseUri; } } ////// Return Source if there is one or String.Empty for unnamed /// font family. /// public override string ToString() { string source = _familyIdentifier.Source; return source != null ? source : string.Empty; } internal FontFamilyIdentifier FamilyIdentifier { get { return _familyIdentifier; } } ////// Distance from character cell top to English baseline relative to em size. /// public double Baseline { get { return FirstFontFamily.BaselineDesign; } set { VerifyMutable().SetBaseline(value); } } ////// Recommended baseline-to-baseline distance for the text in this font relative to em size. /// public double LineSpacing { get { return FirstFontFamily.LineSpacingDesign; } set { VerifyMutable().SetLineSpacing(value); } } internal double GetLineSpacingForDisplayMode(double emSize) { return FirstFontFamily.LineSpacing(emSize, 1, Util.PixelsPerDip, TextFormattingMode.Display); } ////// Font families from the default system font location. /// ///Collection of FontFamly objects from the default system font location. [CLSCompliant(false)] public ICollectionGetTypefaces() { return FirstFontFamily.GetTypefaces(_familyIdentifier); } /// /// Create correspondent hash code for the object /// ///object hash code public override int GetHashCode() { if (_familyIdentifier.Source != null) { // named font family: hash based on canonical name return _familyIdentifier.GetHashCode(); } else { // unnamed family: hash is based on object identity return base.GetHashCode(); } } ////// Equality check /// public override bool Equals(object o) { FontFamily f = o as FontFamily; if (f == null) { // different types or o == null return false; } else if (_familyIdentifier.Source != null) { // named font family; compare canonical names return _familyIdentifier.Equals(f._familyIdentifier); } else { // unnamed font families are equal only if they're the same instance return base.Equals(o); } } ////// Verifies that the FontFamily can be changed and returns a CompositeFontFamily /// private CompositeFontFamily VerifyMutable() { CompositeFontFamily mutableFamily = _firstFontFamily as CompositeFontFamily; if (mutableFamily == null) { throw new NotSupportedException(SR.Get(SRID.FontFamily_ReadOnly)); } return mutableFamily; } ////// First font family /// internal IFontFamily FirstFontFamily { get { IFontFamily family = _firstFontFamily; if (family == null) { // Call Canonicalize() directly so it won't just be called on the boxed object. _familyIdentifier.Canonicalize(); // Look up first font family from cache. If not found, construct a new one. family = TypefaceMetricsCache.ReadonlyLookup(FamilyIdentifier) as IFontFamily; if (family == null) { FontStyle style = FontStyles.Normal; FontWeight weight = FontWeights.Normal; FontStretch stretch = FontStretches.Normal; family = FindFirstFontFamilyAndFace(ref style, ref weight, ref stretch); if (family == null) { // fall back to null font family = LookupFontFamily(NullFontFamilyCanonicalName); Invariant.Assert(family != null); } TypefaceMetricsCache.Add(FamilyIdentifier, family); } _firstFontFamily = family; } return family; } } #region Resolving family name to font family ////// Scan the friendly name string finding the first valid font family /// internal static IFontFamily FindFontFamilyFromFriendlyNameList(string friendlyNameList) { IFontFamily firstFontFamily = null; // Split limits the number of tokens in a family name. FontFamilyIdentifier identifier = new FontFamilyIdentifier(friendlyNameList, null); for (int i = 0, c = identifier.Count; firstFontFamily == null && i < c; i++) { firstFontFamily = LookupFontFamily(identifier[i]); } if (firstFontFamily == null) { // cannot find first font family, assume null font for first font family firstFontFamily = LookupFontFamily(NullFontFamilyCanonicalName); // null font family should always exist Invariant.Assert(firstFontFamily != null); } return firstFontFamily; } ////// Create font family from canonical family and ensure at least a /// fallback family is created if the specified name cannot be resolved. /// internal static IFontFamily SafeLookupFontFamily( CanonicalFontFamilyReference canonicalName, out bool nullFont ) { nullFont = false; IFontFamily fontFamily = LookupFontFamily(canonicalName); if(fontFamily == null) { nullFont = true; fontFamily = LookupFontFamily(NullFontFamilyCanonicalName); Invariant.Assert(fontFamily != null, "Unable to create null font family"); } return fontFamily; } ////// Look up font family from canonical name /// /// font family canonical name internal static IFontFamily LookupFontFamily(CanonicalFontFamilyReference canonicalName) { FontStyle style = FontStyles.Normal; FontWeight weight = FontWeights.Normal; FontStretch stretch = FontStretches.Normal; return LookupFontFamilyAndFace(canonicalName, ref style, ref weight, ref stretch); } #endregion #region Resolving face name into font family and implied face ////// Precreates family collection for Windows Fonts folder, so that we don't have to repeat lookup /// every time for it. /// ////// /// Critical - Exposes windows font information. /// Safe - as this doesn't expose sensitive font directly /// [SecurityCritical, SecurityTreatAsSafe] private static FamilyCollection PreCreateDefaultFamilyCollection() { FamilyCollection familyCollection = FamilyCollection.FromWindowsFonts(Util.WindowsFontsUriObject); return familyCollection; } ////// Find the first valid IFontFamily, if any, for this FontFamily and sets the style, weight, /// and stretch to valies implied by the font family (e.g., "Arial Bold" implies FontWeight.Bold). /// internal IFontFamily FindFirstFontFamilyAndFace( ref FontStyle style, ref FontWeight weight, ref FontStretch stretch ) { if (_familyIdentifier.Source == null) { Invariant.Assert(_firstFontFamily != null, "Unnamed FontFamily should have a non-null first font family"); return _firstFontFamily; } IFontFamily firstFontFamily = null; _familyIdentifier.Canonicalize(); for (int i = 0, c = _familyIdentifier.Count; firstFontFamily == null && i < c; ++i) { firstFontFamily = LookupFontFamilyAndFace( _familyIdentifier[i], ref style, ref weight, ref stretch); } return firstFontFamily; } ////// Lookup font family from canonical name. /// /// font face canonical name /// FontStyle implied by the font family. /// FontWeight implied by the font family. /// FontStretch implied by the font family. ///The font family object. ////// Critical - This method accesses the Util.WindowsFontsUriObject which is privileged information /// and looks up from the font cache which is a critical operation. /// Safe - This method returns a IFontFamily which is safe to passed around. /// [SecurityCritical, SecurityTreatAsSafe] internal static IFontFamily LookupFontFamilyAndFace( CanonicalFontFamilyReference canonicalFamilyReference, ref FontStyle style, ref FontWeight weight, ref FontStretch stretch ) { if (canonicalFamilyReference == null || object.ReferenceEquals(canonicalFamilyReference, CanonicalFontFamilyReference.Unresolved)) { // no canonical name, e.g., because the friendly name was an empty string // or could not be canonicalized return null; } try { FamilyCollection familyCollection; if (canonicalFamilyReference.LocationUri == null && canonicalFamilyReference.EscapedFileName == null) { // No explicit location; use the default family collection. familyCollection = _defaultFamilyCollection; } else if (canonicalFamilyReference.LocationUri != null) { // Look in the location specified by the font family reference. familyCollection = FamilyCollection.FromUri(canonicalFamilyReference.LocationUri); } else // canonicalFamilyReference.EscapedFileName != null { // Look in the specified file in the Windows Fonts folder // Note: CanonicalFamilyReference.EscapedFileName is safe to combine with Util.WindowsFontsUriObject because CanonicalFamilyReference guarantees that it will be a simple filename // without relative path or directory components. Uri locationUri = new Uri(Util.WindowsFontsUriObject, canonicalFamilyReference.EscapedFileName); familyCollection = FamilyCollection.FromWindowsFonts(locationUri); } IFontFamily fontFamily = familyCollection.LookupFamily( canonicalFamilyReference.FamilyName, ref style, ref weight, ref stretch ); return fontFamily; } // The method returns null in case of malformed/non-existent fonts and we fall back to the next font. // Therefore, we can disable PreSharp warning about empty catch bodies. #pragma warning disable 6502 catch (FileFormatException) { // malformed font file } catch (IOException) { // canonical name points to a place that doesn't exist or can't be read for some reason } catch (UnauthorizedAccessException) { // canonical name points to a place caller doesn't have permission to access } catch (ArgumentException) { // canonical name points to a valid Uri that doesn't point to a well formed // OS local path } catch (NotSupportedException) { // canonical name points to a Uri that specifies an unregistered scheme } catch (UriFormatException) { // canonical name points to a malformed Uri } #pragma warning restore 6502 // we want to fall back to the default fallback font instead of crashing return null; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation, 2002 // // File: FontFamily.cs // // Contents: FontFamily // // Created : 5-25-2003 Worachai Chaoweeraprasit (wchao) // Modified : 8-08-2008 [....] - Integrating with DWrite. // //----------------------------------------------------------------------- using System; using System.Text; using System.IO; using System.Globalization; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Windows; using System.Windows.Markup; // for XmlLanguage using System.ComponentModel; using System.ComponentModel.Design; using MS.Utility; using MS.Internal; using MS.Internal.FontCache; using MS.Internal.FontFace; using MS.Internal.Shaping; using System.Security; using SR = MS.Internal.PresentationCore.SR; using SRID = MS.Internal.PresentationCore.SRID; // Since we disable PreSharp warnings in this file, we first need to disable warnings about unknown message numbers and unknown pragmas. #pragma warning disable 1634, 1691 namespace System.Windows.Media { ////// Represents a family of related fonts. Fonts in a FontFamily differ only in style, /// weight, or stretch. /// [TypeConverter(typeof(FontFamilyConverter))] [ValueSerializer(typeof(FontFamilyValueSerializer))] [Localizability(LocalizationCategory.Font)] public class FontFamily { ////// Family name originally passed to by user and information derived from it. /// private FontFamilyIdentifier _familyIdentifier; ////// The first valid font family. If no valid font family can be resolved from /// the given name, this will point to a NullFontFamily object. /// private IFontFamily _firstFontFamily; ////// Null font is the font that has metrics but logically does not support any Unicode codepoint /// so whatever text we throw at it would result in being mapped to missing glyph. /// internal static readonly CanonicalFontFamilyReference NullFontFamilyCanonicalName = CanonicalFontFamilyReference.Create(null, "#ARIAL"); internal const string GlobalUI = "#GLOBAL USER INTERFACE"; internal static FontFamily FontFamilyGlobalUI = new FontFamily(GlobalUI); private static volatile FamilyCollection _defaultFamilyCollection = PreCreateDefaultFamilyCollection(); private static FontFamilyMapCollection _emptyFamilyMaps = null; ////// Constructs FontFamily from a string. /// /// Specifies one or more comma-separated family names, each /// of which may be either a regular family name string (e.g., "Arial") or a URI /// (e.g., "file:///c:/windows/fonts/#Arial"). public FontFamily(string familyName) : this(null, familyName) {} ////// Constructs FontFamily from a string and an optional base URI. /// /// Specifies the base URI used to resolve family names, typically /// the URI of the document or element that refers to the font family. Can be null. /// Specifies one or more comma-separated family names, each /// of which may be either a regular family name string (e.g., "Arial") or a URI /// (e.g., "file:///c:/windows/fonts/#Arial"). public FontFamily(Uri baseUri, string familyName) { if (familyName == null) throw new ArgumentNullException("familyName"); if (baseUri != null && !baseUri.IsAbsoluteUri) throw new ArgumentException(SR.Get(SRID.UriNotAbsolute), "baseUri"); _familyIdentifier = new FontFamilyIdentifier(familyName, baseUri); } internal FontFamily(FontFamilyIdentifier familyIdentifier) { _familyIdentifier = familyIdentifier; } ////// Construct an anonymous font family, i.e., a composite font that is created /// programatically instead of referenced by name or URI. /// public FontFamily() { _familyIdentifier = new FontFamilyIdentifier(null, null); _firstFontFamily = new CompositeFontFamily(); } ////// Collection of culture-dependant family names. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public LanguageSpecificStringDictionary FamilyNames { get { CompositeFontFamily compositeFont = FirstFontFamily as CompositeFontFamily; if (compositeFont != null) { // Return the read/write dictionary of family names. return compositeFont.FamilyNames; } else { // Return a wrapper for the cached family's read-only dictionary. return new LanguageSpecificStringDictionary(FirstFontFamily.Names); } } } ////// List of FamilyTypeface objects. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public FamilyTypefaceCollection FamilyTypefaces { get { CompositeFontFamily compositeFont = FirstFontFamily as CompositeFontFamily; if (compositeFont != null) { // Return the read/write list of typefaces for the font. return compositeFont.FamilyTypefaces; } else { // Return a wrapper for the read-only collection of typefaces. return new FamilyTypefaceCollection(FirstFontFamily.GetTypefaces(_familyIdentifier)); } } } ////// Collection of FontFamilyMap objects for an anonymous font family. For named font /// families, this property returns an empty, read-only list. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public FontFamilyMapCollection FamilyMaps { get { CompositeFontFamily compositeFont = FirstFontFamily as CompositeFontFamily; if (compositeFont != null) { // Read the read/write list of family maps for the font. return compositeFont.FamilyMaps; } else { // Return an empty, read-only collection of FamilyMaps. if (_emptyFamilyMaps == null) { _emptyFamilyMaps = new FontFamilyMapCollection(null); } return _emptyFamilyMaps; } } } ////// Family names and/or URIs used to construct the font family. /// public string Source { get { return _familyIdentifier.Source; } } ////// Base URI used to resolve family names, typically the URI of the document or element /// that refers to the font family. /// ////// Family names are interpreted first relative to the base URI (if not null) and then /// relative to the default folder for installed fonts. /// public Uri BaseUri { get { return _familyIdentifier.BaseUri; } } ////// Return Source if there is one or String.Empty for unnamed /// font family. /// public override string ToString() { string source = _familyIdentifier.Source; return source != null ? source : string.Empty; } internal FontFamilyIdentifier FamilyIdentifier { get { return _familyIdentifier; } } ////// Distance from character cell top to English baseline relative to em size. /// public double Baseline { get { return FirstFontFamily.BaselineDesign; } set { VerifyMutable().SetBaseline(value); } } ////// Recommended baseline-to-baseline distance for the text in this font relative to em size. /// public double LineSpacing { get { return FirstFontFamily.LineSpacingDesign; } set { VerifyMutable().SetLineSpacing(value); } } internal double GetLineSpacingForDisplayMode(double emSize) { return FirstFontFamily.LineSpacing(emSize, 1, Util.PixelsPerDip, TextFormattingMode.Display); } ////// Font families from the default system font location. /// ///Collection of FontFamly objects from the default system font location. [CLSCompliant(false)] public ICollectionGetTypefaces() { return FirstFontFamily.GetTypefaces(_familyIdentifier); } /// /// Create correspondent hash code for the object /// ///object hash code public override int GetHashCode() { if (_familyIdentifier.Source != null) { // named font family: hash based on canonical name return _familyIdentifier.GetHashCode(); } else { // unnamed family: hash is based on object identity return base.GetHashCode(); } } ////// Equality check /// public override bool Equals(object o) { FontFamily f = o as FontFamily; if (f == null) { // different types or o == null return false; } else if (_familyIdentifier.Source != null) { // named font family; compare canonical names return _familyIdentifier.Equals(f._familyIdentifier); } else { // unnamed font families are equal only if they're the same instance return base.Equals(o); } } ////// Verifies that the FontFamily can be changed and returns a CompositeFontFamily /// private CompositeFontFamily VerifyMutable() { CompositeFontFamily mutableFamily = _firstFontFamily as CompositeFontFamily; if (mutableFamily == null) { throw new NotSupportedException(SR.Get(SRID.FontFamily_ReadOnly)); } return mutableFamily; } ////// First font family /// internal IFontFamily FirstFontFamily { get { IFontFamily family = _firstFontFamily; if (family == null) { // Call Canonicalize() directly so it won't just be called on the boxed object. _familyIdentifier.Canonicalize(); // Look up first font family from cache. If not found, construct a new one. family = TypefaceMetricsCache.ReadonlyLookup(FamilyIdentifier) as IFontFamily; if (family == null) { FontStyle style = FontStyles.Normal; FontWeight weight = FontWeights.Normal; FontStretch stretch = FontStretches.Normal; family = FindFirstFontFamilyAndFace(ref style, ref weight, ref stretch); if (family == null) { // fall back to null font family = LookupFontFamily(NullFontFamilyCanonicalName); Invariant.Assert(family != null); } TypefaceMetricsCache.Add(FamilyIdentifier, family); } _firstFontFamily = family; } return family; } } #region Resolving family name to font family ////// Scan the friendly name string finding the first valid font family /// internal static IFontFamily FindFontFamilyFromFriendlyNameList(string friendlyNameList) { IFontFamily firstFontFamily = null; // Split limits the number of tokens in a family name. FontFamilyIdentifier identifier = new FontFamilyIdentifier(friendlyNameList, null); for (int i = 0, c = identifier.Count; firstFontFamily == null && i < c; i++) { firstFontFamily = LookupFontFamily(identifier[i]); } if (firstFontFamily == null) { // cannot find first font family, assume null font for first font family firstFontFamily = LookupFontFamily(NullFontFamilyCanonicalName); // null font family should always exist Invariant.Assert(firstFontFamily != null); } return firstFontFamily; } ////// Create font family from canonical family and ensure at least a /// fallback family is created if the specified name cannot be resolved. /// internal static IFontFamily SafeLookupFontFamily( CanonicalFontFamilyReference canonicalName, out bool nullFont ) { nullFont = false; IFontFamily fontFamily = LookupFontFamily(canonicalName); if(fontFamily == null) { nullFont = true; fontFamily = LookupFontFamily(NullFontFamilyCanonicalName); Invariant.Assert(fontFamily != null, "Unable to create null font family"); } return fontFamily; } ////// Look up font family from canonical name /// /// font family canonical name internal static IFontFamily LookupFontFamily(CanonicalFontFamilyReference canonicalName) { FontStyle style = FontStyles.Normal; FontWeight weight = FontWeights.Normal; FontStretch stretch = FontStretches.Normal; return LookupFontFamilyAndFace(canonicalName, ref style, ref weight, ref stretch); } #endregion #region Resolving face name into font family and implied face ////// Precreates family collection for Windows Fonts folder, so that we don't have to repeat lookup /// every time for it. /// ////// /// Critical - Exposes windows font information. /// Safe - as this doesn't expose sensitive font directly /// [SecurityCritical, SecurityTreatAsSafe] private static FamilyCollection PreCreateDefaultFamilyCollection() { FamilyCollection familyCollection = FamilyCollection.FromWindowsFonts(Util.WindowsFontsUriObject); return familyCollection; } ////// Find the first valid IFontFamily, if any, for this FontFamily and sets the style, weight, /// and stretch to valies implied by the font family (e.g., "Arial Bold" implies FontWeight.Bold). /// internal IFontFamily FindFirstFontFamilyAndFace( ref FontStyle style, ref FontWeight weight, ref FontStretch stretch ) { if (_familyIdentifier.Source == null) { Invariant.Assert(_firstFontFamily != null, "Unnamed FontFamily should have a non-null first font family"); return _firstFontFamily; } IFontFamily firstFontFamily = null; _familyIdentifier.Canonicalize(); for (int i = 0, c = _familyIdentifier.Count; firstFontFamily == null && i < c; ++i) { firstFontFamily = LookupFontFamilyAndFace( _familyIdentifier[i], ref style, ref weight, ref stretch); } return firstFontFamily; } ////// Lookup font family from canonical name. /// /// font face canonical name /// FontStyle implied by the font family. /// FontWeight implied by the font family. /// FontStretch implied by the font family. ///The font family object. ////// Critical - This method accesses the Util.WindowsFontsUriObject which is privileged information /// and looks up from the font cache which is a critical operation. /// Safe - This method returns a IFontFamily which is safe to passed around. /// [SecurityCritical, SecurityTreatAsSafe] internal static IFontFamily LookupFontFamilyAndFace( CanonicalFontFamilyReference canonicalFamilyReference, ref FontStyle style, ref FontWeight weight, ref FontStretch stretch ) { if (canonicalFamilyReference == null || object.ReferenceEquals(canonicalFamilyReference, CanonicalFontFamilyReference.Unresolved)) { // no canonical name, e.g., because the friendly name was an empty string // or could not be canonicalized return null; } try { FamilyCollection familyCollection; if (canonicalFamilyReference.LocationUri == null && canonicalFamilyReference.EscapedFileName == null) { // No explicit location; use the default family collection. familyCollection = _defaultFamilyCollection; } else if (canonicalFamilyReference.LocationUri != null) { // Look in the location specified by the font family reference. familyCollection = FamilyCollection.FromUri(canonicalFamilyReference.LocationUri); } else // canonicalFamilyReference.EscapedFileName != null { // Look in the specified file in the Windows Fonts folder // Note: CanonicalFamilyReference.EscapedFileName is safe to combine with Util.WindowsFontsUriObject because CanonicalFamilyReference guarantees that it will be a simple filename // without relative path or directory components. Uri locationUri = new Uri(Util.WindowsFontsUriObject, canonicalFamilyReference.EscapedFileName); familyCollection = FamilyCollection.FromWindowsFonts(locationUri); } IFontFamily fontFamily = familyCollection.LookupFamily( canonicalFamilyReference.FamilyName, ref style, ref weight, ref stretch ); return fontFamily; } // The method returns null in case of malformed/non-existent fonts and we fall back to the next font. // Therefore, we can disable PreSharp warning about empty catch bodies. #pragma warning disable 6502 catch (FileFormatException) { // malformed font file } catch (IOException) { // canonical name points to a place that doesn't exist or can't be read for some reason } catch (UnauthorizedAccessException) { // canonical name points to a place caller doesn't have permission to access } catch (ArgumentException) { // canonical name points to a valid Uri that doesn't point to a well formed // OS local path } catch (NotSupportedException) { // canonical name points to a Uri that specifies an unregistered scheme } catch (UriFormatException) { // canonical name points to a malformed Uri } #pragma warning restore 6502 // we want to fall back to the default fallback font instead of crashing return null; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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