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Fix Type1 font parsing when .notdef is not at index zero

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Fixes #11477
The PDF draws many space characters but the embedded fonts don't have a glyph named `space`, so `.notdef` should be drawn instead. PDF.js assumed that Type1 fonts define `.notdef` as the first glyph (index 0). However, now the fonts have the glyph `A` at index 0 and `.notdef` is the last one, so `A` appears where spaces are expected.

Because the rest of the font machinery in `core/fonts.js` assumes `.notdef` is at index zero, it's easiest to modify `core/type1_parser.js` so that it "repairs" fonts and makes sure `.notdef` is at index 0.
This commit is contained in:
Jani Pehkonen 2020-03-03 21:55:51 +02:00
parent 52749d1f0d
commit 71e7686950
4 changed files with 15 additions and 2 deletions
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10
src/core/type1_parser.js
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@ -679,13 +679,19 @@ var Type1Parser = (function Type1ParserClosure() {
// here and put an endchar to make the validator happy.
output = [14];
}
program.charstrings.push({
const charStringObject = {
glyphName: glyph,
charstring: output,
width: charString.width,
lsb: charString.lsb,
seac: charString.seac,
});
};
if (glyph === ".notdef") {
// Make sure .notdef is at index zero (issue #11477).
program.charstrings.unshift(charStringObject);
} else {
program.charstrings.push(charStringObject);
}
// Attempt to replace missing widths, from the font dictionary /Widths
// entry, with ones from the font data (fixes issue11150_reduced.pdf).