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cache last loaded font from the resource store during content parsing

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Eliot Jones
2019-12-24 23:24:52 +00:00
parent ec060ae81b
commit 815705494a
1 changed files with 16 additions and 0 deletions
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16
src/UglyToad.PdfPig/Content/ResourceStore.cs
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@@ -22,6 +22,8 @@
private readonly Dictionary<NameToken, ResourceColorSpace> namedColorSpaces = new Dictionary<NameToken, ResourceColorSpace>(); private readonly Dictionary<NameToken, ResourceColorSpace> namedColorSpaces = new Dictionary<NameToken, ResourceColorSpace>();
private (NameToken name, IFont font) lastLoadedFont;
public ResourceStore(IPdfTokenScanner scanner, IFontFactory fontFactory) public ResourceStore(IPdfTokenScanner scanner, IFontFactory fontFactory)
{ {
this.scanner = scanner; this.scanner = scanner;
@@ -30,6 +32,8 @@
public void LoadResourceDictionary(DictionaryToken resourceDictionary, bool isLenientParsing) public void LoadResourceDictionary(DictionaryToken resourceDictionary, bool isLenientParsing)
{ {
lastLoadedFont = (null, null);
currentResourceState.Push(); currentResourceState.Push();
if (resourceDictionary.TryGet(NameToken.Font, out var fontBase)) if (resourceDictionary.TryGet(NameToken.Font, out var fontBase))
@@ -101,11 +105,14 @@
public void UnloadResourceDictionary() public void UnloadResourceDictionary()
{ {
lastLoadedFont = (null, null);
currentResourceState.Pop(); currentResourceState.Pop();
} }
private void LoadFontDictionary(DictionaryToken fontDictionary, bool isLenientParsing) private void LoadFontDictionary(DictionaryToken fontDictionary, bool isLenientParsing)
{ {
lastLoadedFont = (null, null);
foreach (var pair in fontDictionary.Data) foreach (var pair in fontDictionary.Data)
{ {
if (!(pair.Value is IndirectReferenceToken objectKey)) if (!(pair.Value is IndirectReferenceToken objectKey))
@@ -140,15 +147,24 @@
public IFont GetFont(NameToken name) public IFont GetFont(NameToken name)
{ {
if (lastLoadedFont.name == name)
{
return lastLoadedFont.font;
}
var reference = currentResourceState[name]; var reference = currentResourceState[name];
loadedFonts.TryGetValue(reference, out var font); loadedFonts.TryGetValue(reference, out var font);
lastLoadedFont = (name, font);
return font; return font;
} }
public IFont GetFontDirectly(IndirectReferenceToken fontReferenceToken, bool isLenientParsing) public IFont GetFontDirectly(IndirectReferenceToken fontReferenceToken, bool isLenientParsing)
{ {
lastLoadedFont = (null, null);
if (!DirectObjectFinder.TryGet(fontReferenceToken, scanner, out DictionaryToken fontDictionaryToken)) if (!DirectObjectFinder.TryGet(fontReferenceToken, scanner, out DictionaryToken fontDictionaryToken))
{ {
throw new PdfDocumentFormatException($"The requested font reference token {fontReferenceToken} wasn't a font."); throw new PdfDocumentFormatException($"The requested font reference token {fontReferenceToken} wasn't a font.");