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Improve handling of mismatching /BaseFont and /FontName entries for non-embedded fonts (issue 7454)

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This patch is the result of me going through some old issues regarding non-embedded Wingdings support.

There's a few different things wrong in the referenced PDF document:
 - The /BaseFont and /FontName entries don't agree on the name of the fonts, with one font using `/BaseFont /Wingdings-Regular` and `/FontName /wg09np` which obviously makes no sense.
   To address this we'll compare the font-names against our lists of known ones and ignore /FontName entries that don't make sense iff the /BaseFont entry is a known font-name.
 - The non-embedded Wingdings font also set an incorrect /Encoding, in this case /MacRomanEncoding, which should have been fixed by PR 16465. However this doesn't work since the font has *bogus* font-flags, that fail to categorize the font as Symbolic.
   To address this we'll also compare the font-name against the list of known symbol fonts.
This commit is contained in:
Jonas Jenwald 2023-06-02 12:33:36 +02:00
parent 0023c4a511
commit 459d26edec
5 changed files with 45 additions and 20 deletions
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14
src/core/standard_fonts.js
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@ -309,6 +309,9 @@ const getSymbolsFonts = getLookupTableFactory(function (t) {
t.Dingbats = true;
t.Symbol = true;
t.ZapfDingbats = true;
t.Wingdings = true;
t["Wingdings-Bold"] = true;
t["Wingdings-Regular"] = true;
});
// Glyph map for well-known standard fonts. Sometimes Ghostscript uses CID
@ -888,6 +891,16 @@ function getStandardFontName(name) {
return stdFontMap[fontName];
}
function isKnownFontName(name) {
const fontName = normalizeFontName(name);
return !!(
getStdFontMap()[fontName] ||
getNonStdFontMap()[fontName] ||
getSerifFonts()[fontName] ||
getSymbolsFonts()[fontName]
);
}
export {
getFontNameToFileMap,
getGlyphMapForStandardFonts,
@ -898,4 +911,5 @@ export {
getSupplementalGlyphMapForArialBlack,
getSupplementalGlyphMapForCalibri,
getSymbolsFonts,
isKnownFontName,
};