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Skip mapping of CIDFontType2 glyphs when the font either has a |IdentityToUnicodeMap| or a |toUnicodeMap| with 65536 elements (issue 5677)

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This patch slightly extends the heuristics used when trying to skip mapping of missing glyphs.

Fixes 5677.
This commit is contained in:
Jonas Jenwald 2015-06-18 21:53:15 +02:00
parent 99415a75b7
commit aa3a64e975
4 changed files with 14 additions and 2 deletions
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8
src/core/fonts.js
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@ -4130,13 +4130,17 @@ var Font = (function FontClosure() {
var charCodeToGlyphId = [], charCode;
var toUnicode = properties.toUnicode, widths = properties.widths;
var isIdentityUnicode = toUnicode instanceof IdentityToUnicodeMap;
var skipToUnicode = (toUnicode instanceof IdentityToUnicodeMap ||
toUnicode.length === 0x10000);
// Helper function to try to skip mapping of empty glyphs.
// Note: In some cases, just relying on the glyph data doesn't work,
// hence we also use a few heuristics to fix various PDF files.
function hasGlyph(glyphId, charCode, widthCode) {
if (!missingGlyphs[glyphId]) {
return true;
}
if (!isIdentityUnicode && charCode >= 0 && toUnicode.has(charCode)) {
if (!skipToUnicode && charCode >= 0 && toUnicode.has(charCode)) {
return true;
}
if (widths && widthCode >= 0 && isNum(widths[widthCode])) {