/// <summary>
/// Caches a font source under its face name and its key.
/// </summary>
public static XFontSource CacheFontSource(XFontSource fontSource)
{
try
{
Lock.EnterFontFactory();
// Check whether an identical font source with a different face name already exists.
XFontSource existingFontSource;
if (FontSourcesByKey.TryGetValue(fontSource.Key, out existingFontSource))
{
#if DEBUG
// Fonts have same length and check sum. Now check byte by byte identity.
int length = fontSource.Bytes.Length;
for (int idx = 0; idx < length; idx++)
{
if (existingFontSource.Bytes[idx] != fontSource.Bytes[idx])
{
//Debug.Assert(false,"Two fonts with identical checksum found.");
break;
//goto FontsAreNotIdentical;
}
}
Debug.Assert(existingFontSource.Fontface != null);
#endif
return(existingFontSource);
//FontsAreNotIdentical:
//// Incredible rare case: Two different fonts have the same size and check sum.
//// Give the new one a new key until it do not clash with an existing one.
//while (FontSourcesByKey.ContainsKey(fontSource.Key))
// fontSource.IncrementKey();
}
OpenTypeFontface fontface = fontSource.Fontface;
if (fontface == null)
{
// Create OpenType fontface for this font source.
fontSource.Fontface = new OpenTypeFontface(fontSource);
}
FontSourcesByKey.Add(fontSource.Key, fontSource);
if (FontSourcesByName.ContainsKey(fontSource.FontName))
{
// TODO: merge font faces?..
}
else
{
FontSourcesByName.Add(fontSource.FontName, fontSource);
}
return(fontSource);
}
finally { Lock.ExitFontFactory(); }
}
//// Suffix for internal face names to indicate that the font data comes from the platform
//// and not from the users font resolver.
//public const string PlatformTag = "platform:";
/// <summary>
/// Converts specified information about a required typeface into a specific font.
/// </summary>
/// <param name="familyName">Name of the font family.</param>
/// <param name="fontResolvingOptions">The font resolving options.</param>
/// <param name="typefaceKey">Typeface key if already known by caller, null otherwise.</param>
/// <returns>
/// Information about the typeface, or null if no typeface can be found.
/// </returns>
public static FontResolverInfo ResolveTypeface(string familyName, FontResolvingOptions fontResolvingOptions, string typefaceKey)
{
if (string.IsNullOrEmpty(typefaceKey))
{
typefaceKey = XGlyphTypeface.ComputeKey(familyName, fontResolvingOptions);
}
try
{
Lock.EnterFontFactory();
// Was this typeface requested before?
FontResolverInfo fontResolverInfo;
if (FontResolverInfosByName.TryGetValue(typefaceKey, out fontResolverInfo))
{
return(fontResolverInfo);
}
// Case: This typeface was not resolved before.
// Is there a custom font resolver available?
IFontResolver customFontResolver = GlobalFontSettings.FontResolver;
if (customFontResolver != null)
{
// Case: Use custom font resolver.
fontResolverInfo = customFontResolver.ResolveTypeface(familyName, fontResolvingOptions.IsBold, fontResolvingOptions.IsItalic);
// If resolved by custom font resolver register info and font source.
if (fontResolverInfo != null && !(fontResolverInfo is PlatformFontResolverInfo))
{
string resolverInfoKey = fontResolverInfo.Key;
FontResolverInfo existingFontResolverInfo;
if (FontResolverInfosByName.TryGetValue(resolverInfoKey, out existingFontResolverInfo))
{
// Case: A new typeface was resolved with the same info as a previous one.
// Discard new object an reuse previous one.
fontResolverInfo = existingFontResolverInfo;
// Associate with typeface key.
FontResolverInfosByName.Add(typefaceKey, fontResolverInfo);
#if DEBUG
// The font source should exist.
Debug.Assert(FontSourcesByName.ContainsKey(fontResolverInfo.FaceName));
#endif
}
else
{
// Case: No such font resolver info exists.
// Add to both dictionaries.
FontResolverInfosByName.Add(typefaceKey, fontResolverInfo);
Debug.Assert(resolverInfoKey == fontResolverInfo.Key);
FontResolverInfosByName.Add(resolverInfoKey, fontResolverInfo);
// Create font source if not yet exists.
XFontSource previousFontSource;
if (FontSourcesByName.TryGetValue(fontResolverInfo.FaceName, out previousFontSource))
{
// Case: The font source exists, because a previous font resolver info comes
// with the same face name, but was different in style simulation flags.
// Nothing to do.
}
else
{
// Case: Get font from custom font resolver and create font source.
byte[] bytes = customFontResolver.GetFont(fontResolverInfo.FaceName);
XFontSource fontSource = XFontSource.GetOrCreateFrom(bytes);
// Add font source's font resolver name if it is different to the face name.
if (string.Compare(fontResolverInfo.FaceName, fontSource.FontName, StringComparison.OrdinalIgnoreCase) != 0)
{
FontSourcesByName.Add(fontResolverInfo.FaceName, fontSource);
}
}
}
}
}
else
{
// Case: There was no custom font resolver set.
// Use platform font resolver.
// If it was successful resolver info and font source are cached
// automatically by PlatformFontResolver.ResolveTypeface.
fontResolverInfo = PlatformFontResolver.ResolveTypeface(familyName, fontResolvingOptions, typefaceKey);
}
// Return value is null if the typeface could not be resolved.
// In this case PDFsharp stops.
return(fontResolverInfo);
}
finally { Lock.ExitFontFactory(); }
}