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Properly handle CompactFontFormatCidFont font matrix and fix #1149

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This commit is contained in:
BobLd
2025-09-13 10:24:15 +01:00
parent d5b97065bd
commit 0ef120dc5c
1 changed files with 13 additions and 9 deletions
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22
src/UglyToad.PdfPig.Fonts/CompactFontFormat/CompactFontFormatFont.cs
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@@ -27,7 +27,7 @@
/// <summary>
/// The font matrix for this font.
/// </summary>
public TransformationMatrix FontMatrix => TopDictionary.FontMatrix.HasValue ? TopDictionary.FontMatrix.Value : TransformationMatrix.FromValues(0.001, 0, 0, 0.001, 0, 0);
public TransformationMatrix FontMatrix => TopDictionary.FontMatrix ?? TransformationMatrix.FromValues(0.001, 0, 0, 0.001, 0, 0);
/// <summary>
/// The value of Weight from the top dictionary or <see langword="null"/>.
@@ -219,22 +219,26 @@
public override TransformationMatrix? GetFontMatrix(string characterName)
{
// BobLd: It seems PdfBox just returns TopDictionary.FontMatrix
// But see https://bugs.ghostscript.com/show_bug.cgi?id=690724
// and https://github.com/veraPDF/veraPDF-library/issues/1010
// TODO - We might need to multiply both matrices together
bool hasDictionary = TryGetFontDictionaryForCharacter(characterName, out var dictionary);
if (TopDictionary.FontMatrix is not null)
if (TopDictionary.FontMatrix.HasValue &&
hasDictionary &&
dictionary.FontMatrix.HasValue)
{
return TopDictionary.FontMatrix.Value.Multiply(dictionary.FontMatrix.Value);
}
if (TopDictionary.FontMatrix.HasValue)
{
return TopDictionary.FontMatrix;
}
if (!TryGetFontDictionaryForCharacter(characterName, out var dictionary))
if (hasDictionary && dictionary.FontMatrix.HasValue)
{
return null;
return dictionary.FontMatrix;
}
return dictionary.FontMatrix;
return null;
}
private bool TryGetPrivateDictionaryForCharacter(string characterName, out CompactFontFormatPrivateDictionary dictionary)