/// <summary>
/// Internal implementation.
/// </summary>
internal static FontResolverInfo ResolveTypeface(string familyName, FontResolvingOptions fontResolvingOptions, string typefaceKey)
{
// Internally we often have the typeface key already.
if (String.IsNullOrEmpty(typefaceKey))
{
typefaceKey = XGlyphTypeface.ComputeKey(familyName, fontResolvingOptions);
}
// The user may call ResolveTypeface anytime from anywhere, so check cache in FontFactory in the first place.
if (FontFactory.TryGetFontResolverInfoByTypefaceKey(typefaceKey, out FontResolverInfo fontResolverInfo))
{
return(fontResolverInfo);
}
// Let the platform create the requested font source and save both PlattformResolverInfo
// and XFontSource in FontFactory cache.
// It is possible that we already have the correct font source. E.g. we already have the regular typeface in cache
// and looking now for the italic typeface, but no such font exists. In this case we get the regular font source
// and cache again it with the italic typeface key. Furthermore in glyph typeface style simulation for italic is set.
#if (CORE || GDI) && !WPF
XFontSource fontSource = CreateFontSource(familyName, fontResolvingOptions, out GdiFont gdiFont, typefaceKey);
#endif
#if WPF && !SILVERLIGHT
WpfFontFamily wpfFontFamily;
WpfTypeface wpfTypeface;
WpfGlyphTypeface wpfGlyphTypeface;
XFontSource fontSource = CreateFontSource(familyName, fontResolvingOptions, out wpfFontFamily, out wpfTypeface, out wpfGlyphTypeface, typefaceKey);
#endif
#if SILVERLIGHT
//GlyphTypeface wpfGlyphTypeface;
XFontSource fontSource = null;//CreateFontSource(familyName, isBold, isItalic, out wpfGlyphTypeface, typefaceKey);
#endif
#if NETFX_CORE || UWP
//GlyphTypeface wpfGlyphTypeface;
XFontSource fontSource = null;//CreateFontSource(familyName, isBold, isItalic, out wpfGlyphTypeface, typefaceKey);
#endif
// If no such font exists return null. PDFSharp will fail.
if (fontSource == null)
{
return(null);
}
//#if (CORE || GDI) && !WPF
// // TODO: Support style simulation for GDI+ platform fonts.
// fontResolverInfo = new PlatformFontResolverInfo(typefaceKey, false, false, gdiFont);
//#endif
if (fontResolvingOptions.OverrideStyleSimulations)
{
#if (CORE || GDI) && !WPF
// TODO: Support style simulation for GDI+ platform fonts.
fontResolverInfo = new PlatformFontResolverInfo(typefaceKey, fontResolvingOptions.MustSimulateBold, fontResolvingOptions.MustSimulateItalic, gdiFont);
#endif
#if WPF && !SILVERLIGHT
fontResolverInfo = new PlatformFontResolverInfo(typefaceKey, fontResolvingOptions.MustSimulateBold, fontResolvingOptions.MustSimulateItalic,
wpfFontFamily, wpfTypeface, wpfGlyphTypeface);
#endif
}
else
{
#if (CORE || GDI) && !WPF
bool mustSimulateBold = gdiFont.Bold && !fontSource.Fontface.os2.IsBold;
bool mustSimulateItalic = gdiFont.Italic && !fontSource.Fontface.os2.IsItalic;
fontResolverInfo = new PlatformFontResolverInfo(typefaceKey, mustSimulateBold, mustSimulateItalic, gdiFont);
#endif
#if WPF && !SILVERLIGHT
// WPF knows what styles have to be simulated.
bool mustSimulateBold = (wpfGlyphTypeface.StyleSimulations & WpfStyleSimulations.BoldSimulation) == WpfStyleSimulations.BoldSimulation;
bool mustSimulateItalic = (wpfGlyphTypeface.StyleSimulations & WpfStyleSimulations.ItalicSimulation) == WpfStyleSimulations.ItalicSimulation;
// Weird behavior of WPF is fixed here in case we request a bold italic typeface.
// If only italic is available, bold is simulated based on italic.
// If only bold is available, italic is simulated based on bold.
// But if both bold and italic is available, italic face is used and bold is simulated.
// The latter case is reversed here, i.e. bold face is used and italic is simulated.
if (fontResolvingOptions.IsBoldItalic && mustSimulateBold && !mustSimulateItalic)
{
// Try to get the bold typeface.
string typefaceKeyBold = XGlyphTypeface.ComputeKey(familyName, true, false);
FontResolverInfo infoBold = ResolveTypeface(familyName,
new FontResolvingOptions(FontHelper.CreateStyle(true, false)), typefaceKeyBold);
// Use it if it does not base on simulation.
if (infoBold != null && infoBold.StyleSimulations == XStyleSimulations.None)
{
// Use existing bold typeface and simulate italic.
fontResolverInfo = new PlatformFontResolverInfo(typefaceKeyBold, false, true,
wpfFontFamily, wpfTypeface, wpfGlyphTypeface);
}
else
{
// Simulate both.
fontResolverInfo = new PlatformFontResolverInfo(typefaceKey, true, true,
wpfFontFamily, wpfTypeface, wpfGlyphTypeface);
}
}
else
{
fontResolverInfo = new PlatformFontResolverInfo(typefaceKey, mustSimulateBold, mustSimulateItalic,
wpfFontFamily, wpfTypeface, wpfGlyphTypeface);
}
#endif
}
#if SILVERLIGHT
fontResolverInfo = null; //new PlattformResolverInfo(typefaceKey, false, false, wpfGlyphTypeface);
#endif
FontFactory.CacheFontResolverInfo(typefaceKey, fontResolverInfo);
// Register font data under the platform specific face name.
// Already done in CreateFontSource.
// FontFactory.CacheNewFontSource(typefaceKey, fontSource);
return(fontResolverInfo);
}
/// <summary>
/// Create a GDI+ font and use its handle to retrieve font data using native calls.
/// </summary>
internal static XFontSource CreateFontSource(string familyName, FontResolvingOptions fontResolvingOptions, out GdiFont font, string typefaceKey)
{
if (String.IsNullOrEmpty(typefaceKey))
{
typefaceKey = XGlyphTypeface.ComputeKey(familyName, fontResolvingOptions);
}
#if true_
if (familyName == "Cambria")
{
Debug - Break.Break();
}
#endif
GdiFontStyle gdiStyle = (GdiFontStyle)(fontResolvingOptions.FontStyle & XFontStyle.BoldItalic);
// Create a 10 point GDI+ font as an exemplar.
font = FontHelper.CreateFont(familyName, 10, gdiStyle, out XFontSource fontSource);
if (fontSource != null)
{
Debug.Assert(font != null);
// Case: Font was created by a GDI+ private font collection.
#if true
#if DEBUG
Debug.Assert(FontFactory.TryGetFontSourceByTypefaceKey(typefaceKey, out XFontSource existingFontSource) &&
ReferenceEquals(fontSource, existingFontSource));
#endif
#else
// Win32 API cannot get font data from fonts created by private font collection,
// because this is handled internally in GDI+.
// Therefore the font source was created when the private font is added to the private font collection.
if (!FontFactory.TryGetFontSourceByTypefaceKey(typefaceKey, out fontSource))
{
// Simplify styles.
// (The code is written for clarity - do not rearrange for optimization)
if (font.Bold && font.Italic)
{
if (FontFactory.TryGetFontSourceByTypefaceKey(XGlyphTypeface.ComputeKey(font.Name, true, false), out fontSource))
{
// Use bold font.
FontFactory.CacheExistingFontSourceWithNewTypefaceKey(typefaceKey, fontSource);
}
else if (FontFactory.TryGetFontSourceByTypefaceKey(XGlyphTypeface.ComputeKey(font.Name, false, true), out fontSource))
{
// Use italic font.
FontFactory.CacheExistingFontSourceWithNewTypefaceKey(typefaceKey, fontSource);
}
else if (FontFactory.TryGetFontSourceByTypefaceKey(XGlyphTypeface.ComputeKey(font.Name, false, false), out fontSource))
{
// Use regular font.
FontFactory.CacheExistingFontSourceWithNewTypefaceKey(typefaceKey, fontSource);
}
}
else if (font.Bold || font.Italic)
{
// Use regular font.
if (FontFactory.TryGetFontSourceByTypefaceKey(XGlyphTypeface.ComputeKey(font.Name, false, false), out fontSource))
{
FontFactory.CacheExistingFontSourceWithNewTypefaceKey(typefaceKey, fontSource);
}
}
else
{
if (FontFactory.TryGetFontSourceByTypefaceKey(XGlyphTypeface.ComputeKey(font.Name, false, false), out fontSource))
{
// Should never come here...
FontFactory.CacheExistingFontSourceWithNewTypefaceKey(typefaceKey, fontSource);
}
}
}
#endif
}
else
{
// Get or create the font source and cache it under the specified typeface key.
fontSource = XFontSource.GetOrCreateFromGdi(typefaceKey, font);
}
return(fontSource);
}