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Use post table when Encoding has only Differences

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Fixes #13107
In the issue, some TrueType glyph names have the format `uniXXXX`.
Font's `Encoding` dictionary has the entry `Differences` but no
`BaseEncoding`. `uniXXXX` names are converted to glyph indices
using font's `post` table but currently that is done only when
`BaseEncoding` exists. We must enable the conversion also when only
`Differences` exists.
This commit is contained in:
Jani Pehkonen 2021-03-31 16:32:30 +03:00
parent 84d7cccb1d
commit 0117ee5071
4 changed files with 21 additions and 7 deletions
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21
src/core/fonts.js
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@ -2901,14 +2901,21 @@ var Font = (function FontClosure() {
}
// Last, try to map any missing charcodes using the post table.
if (properties.glyphNames && baseEncoding.length) {
if (
properties.glyphNames &&
(baseEncoding.length || this.differences.length)
) {
for (let i = 0; i < 256; ++i) {
if (charCodeToGlyphId[i] === undefined && baseEncoding[i]) {
glyphName = baseEncoding[i];
const glyphId = properties.glyphNames.indexOf(glyphName);
if (glyphId > 0 && hasGlyph(glyphId)) {
charCodeToGlyphId[i] = glyphId;
}
if (charCodeToGlyphId[i] !== undefined) {
continue;
}
glyphName = this.differences[i] || baseEncoding[i];
if (!glyphName) {
continue;
}
const glyphId = properties.glyphNames.indexOf(glyphName);
if (glyphId > 0 && hasGlyph(glyphId)) {
charCodeToGlyphId[i] = glyphId;
}
}
}