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handle direct font objects in the resource dictionary

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fonts can appear as dicitionary objects rather than indirect references in the resource dictionary for a page. if we encounter this we parse and store the font by name for retrieval during content parsing.
This commit is contained in:
Eliot Jones
2020-01-27 18:07:51 +00:00
parent 6cf257a331
commit 6292fc256d
1 changed files with 35 additions and 22 deletions
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57
src/UglyToad.PdfPig/Content/ResourceStore.cs
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@@ -16,6 +16,7 @@
private readonly IFontFactory fontFactory; private readonly IFontFactory fontFactory;
private readonly Dictionary<IndirectReference, IFont> loadedFonts = new Dictionary<IndirectReference, IFont>(); private readonly Dictionary<IndirectReference, IFont> loadedFonts = new Dictionary<IndirectReference, IFont>();
private readonly Dictionary<NameToken, IFont> loadedDirectFonts = new Dictionary<NameToken, IFont>();
private readonly StackDictionary<NameToken, IndirectReference> currentResourceState = new StackDictionary<NameToken, IndirectReference>(); private readonly StackDictionary<NameToken, IndirectReference> currentResourceState = new StackDictionary<NameToken, IndirectReference>();
private readonly Dictionary<NameToken, DictionaryToken> extendedGraphicsStates = new Dictionary<NameToken, DictionaryToken>(); private readonly Dictionary<NameToken, DictionaryToken> extendedGraphicsStates = new Dictionary<NameToken, DictionaryToken>();
@@ -132,7 +133,31 @@
foreach (var pair in fontDictionary.Data) foreach (var pair in fontDictionary.Data)
{ {
if (!(pair.Value is IndirectReferenceToken objectKey)) if (pair.Value is IndirectReferenceToken objectKey)
{
var reference = objectKey.Data;
currentResourceState[NameToken.Create(pair.Key)] = reference;
if (loadedFonts.ContainsKey(reference))
{
continue;
}
var fontObject = DirectObjectFinder.Get<DictionaryToken>(objectKey, scanner);
if (fontObject == null)
{
throw new InvalidOperationException($"Could not retrieve the font with name: {pair.Key} which should have been object {objectKey}");
}
loadedFonts[reference] = fontFactory.Get(fontObject, isLenientParsing);
}
else if (pair.Value is DictionaryToken fd)
{
loadedDirectFonts[NameToken.Create(pair.Key)] = fontFactory.Get(fd, isLenientParsing);
}
else
{ {
if (isLenientParsing) if (isLenientParsing)
{ {
@@ -141,24 +166,6 @@
throw new InvalidOperationException($"The font with name {pair.Key} did not link to an object key. Value was: {pair.Value}."); throw new InvalidOperationException($"The font with name {pair.Key} did not link to an object key. Value was: {pair.Value}.");
} }
var reference = objectKey.Data;
currentResourceState[NameToken.Create(pair.Key)] = reference;
if (loadedFonts.ContainsKey(reference))
{
continue;
}
var fontObject = DirectObjectFinder.Get<DictionaryToken>(objectKey, scanner);
if (fontObject == null)
{
throw new InvalidOperationException($"Could not retrieve the font with name: {pair.Key} which should have been object {objectKey}");
}
loadedFonts[reference] = fontFactory.Get(fontObject, isLenientParsing);
} }
} }
@@ -169,9 +176,15 @@
return lastLoadedFont.font; return lastLoadedFont.font;
} }
var reference = currentResourceState[name]; IFont font;
if (currentResourceState.TryGetValue(name, out var reference))
loadedFonts.TryGetValue(reference, out var font); {
loadedFonts.TryGetValue(reference, out font);
}
else if (!loadedDirectFonts.TryGetValue(name, out font))
{
return null;
}
lastLoadedFont = (name, font); lastLoadedFont = (name, font);