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Convert uniXXXX glyph names to proper ones when building the charCodeToGlyphId map for TrueType fonts (bug 1132849, issue 6893, issue 6894)

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This patch adds a `getUnicodeForGlyph` helper function, which is used to recover Unicode values for non-standard glyph names.

Some PDF generators, e.g. Scribus PDF, use improper `uniXXXX` glyph names which breaks the glyph mapping. We can avoid this by converting them to "standard" glyph names instead.

Fixes https://bugzilla.mozilla.org/show_bug.cgi?id=1132849.
Fixes 6893.
Fixes 6894.
This commit is contained in:
Jonas Jenwald 2016-03-07 20:56:15 +01:00
parent 147598417c
commit dfe9015a43
6 changed files with 96 additions and 10 deletions
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31
src/core/unicode.js
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@ -65,6 +65,36 @@
return code;
}
function getUnicodeForGlyph(name, glyphsUnicodeMap) {
var unicode = glyphsUnicodeMap[name];
if (unicode !== undefined) {
return unicode;
}
if (!name) {
return -1;
}
// Try to recover valid Unicode values from 'uniXXXX'/'uXXXX{XX}' glyphs.
if (name[0] === 'u') {
var nameLen = name.length, hexStr;
if (nameLen === 7 && name[1] === 'n' && name[2] === 'i') { // 'uniXXXX'
hexStr = name.substr(3);
} else if (nameLen >= 5 && nameLen <= 7) { // 'uXXXX{XX}'
hexStr = name.substr(1);
} else {
return -1;
}
// Check for upper-case hexadecimal characters, to avoid false positives.
if (hexStr === hexStr.toUpperCase()) {
unicode = parseInt(hexStr, 16);
if (unicode >= 0) {
return unicode;
}
}
}
return -1;
}
var UnicodeRanges = [
{ 'begin': 0x0000, 'end': 0x007F }, // Basic Latin
{ 'begin': 0x0080, 'end': 0x00FF }, // Latin-1 Supplement
@ -1612,4 +1642,5 @@
exports.reverseIfRtl = reverseIfRtl;
exports.getUnicodeRangeFor = getUnicodeRangeFor;
exports.getNormalizedUnicodes = getNormalizedUnicodes;
exports.getUnicodeForGlyph = getUnicodeForGlyph;
}));