AcquireCacheItem(
GlyphTypeface glyphTypeface
)
{
FEMCacheItem manager = null;
Uri fontUri;
CodeAccessPermission uriDiscoveryPermission = glyphTypeface.CriticalUriDiscoveryPermission;
if (uriDiscoveryPermission != null)
{
uriDiscoveryPermission.Assert();
}
try
{
fontUri = glyphTypeface.FontUri;
}
finally
{
if (uriDiscoveryPermission != null)
{
CodeAccessPermission.RevertAssert();
}
}
if (!_fontEmbeddingManagerCache.TryGetValue(fontUri, out manager))
{
manager = new FEMCacheItem(glyphTypeface, _packagingPolicy);
_fontEmbeddingManagerCache.Add(fontUri, manager);
}
return(manager);
}
AcquireCacheItem(
GlyphTypeface glyphTypeface
)
{
FEMCacheItem manager = null;
Uri fontUri = glyphTypeface.FontUri;
if (!_fontEmbeddingManagerCache.TryGetValue(fontUri, out manager))
{
manager = new FEMCacheItem(glyphTypeface, _packagingPolicy);
_fontEmbeddingManagerCache.Add(fontUri, manager);
}
return(manager);
}
ComputeFontSubset(
GlyphRun glyphRun
)
{
if (null == glyphRun)
{
throw new ArgumentNullException("glyphRun");
}
FontEmbeddingRight embeddingRights = glyphRun.GlyphTypeface.EmbeddingRights;
Uri fontUri = null;
if (DetermineEmbeddingAction(embeddingRights) ==
FontEmbeddingAction.ImageOnlyFont)
{
//
// Aquire a bit map stream to embedd the Glyph Run image
//
fontUri = _packagingPolicy.AcquireResourceStreamForXpsImage(XpsS0Markup.ImageUriPlaceHolder).Uri;
}
else
{
FEMCacheItem cacheItem = AcquireCacheItem(
glyphRun.GlyphTypeface
);
if (cacheItem != null)
{
cacheItem.CurrentPageReferences = true;
if (_commitPolicy == FontSubsetterCommitPolicies.None &&
!cacheItem.IsStreamWritten)
{
fontUri = cacheItem.CopyFontStream();
}
else
{
fontUri = cacheItem.AddGlyphRunUsage(glyphRun);
}
}
}
return(fontUri);
}
ComputeFontSubset(
GlyphRun glyphRun
)
{
FontEmbeddingRight embeddingRights = FontEmbeddingRight.RestrictedLicense;
if (null == glyphRun)
{
throw new ArgumentNullException("glyphRun");
}
Uri fontUri = null;
CodeAccessPermission fontReadPermission = glyphRun.GlyphTypeface.CriticalFileReadPermission;
if (fontReadPermission != null)
{
fontReadPermission.Assert();
}
try
{
embeddingRights = glyphRun.GlyphTypeface.EmbeddingRights;
}
finally
{
if (fontReadPermission != null)
{
CodeAccessPermission.RevertAssert();
}
}
if (DetermineEmbeddingAction(embeddingRights) ==
FontEmbeddingAction.ImageOnlyFont)
{
//
// Aquire a bit map stream to embedd the Glyph Run image
//
fontUri = _packagingPolicy.AcquireResourceStreamForXpsImage(XpsS0Markup.ImageUriPlaceHolder).Uri;
}
else
{
FEMCacheItem cacheItem = AcquireCacheItem(
glyphRun.GlyphTypeface
);
if (cacheItem != null)
{
cacheItem.CurrentPageReferences = true;
if (_commitPolicy == FontSubsetterCommitPolicies.None &&
!cacheItem.IsStreamWritten)
{
fontUri = cacheItem.CopyFontStream();
}
else
{
fontUri = cacheItem.AddGlyphRunUsage(glyphRun);
}
}
}
return(fontUri);
}
