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Merge pull request #14882 from Snuffleupagus/issue-14881

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Add support for TrueType format 12 `cmap`s (issue 14881)
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Tim van der Meij 2022-05-07 11:45:54 +02:00 • committed by GitHub
commit f8838eb794
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4 changed files with 35 additions and 2 deletions
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30
src/core/fonts.js
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@ -1499,14 +1499,14 @@ class Font {
}
const format = file.getUint16();
file.skip(2 + 2); // length + language
let hasShortCmap = false;
const mappings = [];
let j, glyphId;
// TODO(mack): refactor this cmap subtable reading logic out
if (format === 0) {
file.skip(2 + 2); // length + language
for (j = 0; j < 256; j++) {
const index = file.getByte();
if (!index) {
@ -1519,6 +1519,8 @@ class Font {
}
hasShortCmap = true;
} else if (format === 2) {
file.skip(2 + 2); // length + language
const subHeaderKeys = [];
let maxSubHeaderKey = 0;
// Read subHeaderKeys. If subHeaderKeys[i] === 0, then i is a
@ -1568,6 +1570,8 @@ class Font {
}
}
} else if (format === 4) {
file.skip(2 + 2); // length + language
// re-creating the table in format 4 since the encoding
// might be changed
const segCount = file.getUint16() >> 1;
@ -1630,6 +1634,8 @@ class Font {
}
}
} else if (format === 6) {
file.skip(2 + 2); // length + language
// Format 6 is a 2-bytes dense mapping, which means the font data
// lives glue together even if they are pretty far in the unicode
// table. (This looks weird, so I can have missed something), this
@ -1647,6 +1653,26 @@ class Font {
glyphId,
});
}
} else if (format === 12) {
file.skip(2 + 4 + 4); // reserved + length + language
const nGroups = file.getInt32() >>> 0;
for (j = 0; j < nGroups; j++) {
const startCharCode = file.getInt32() >>> 0;
const endCharCode = file.getInt32() >>> 0;
let glyphCode = file.getInt32() >>> 0;
for (
let charCode = startCharCode;
charCode <= endCharCode;
charCode++
) {
mappings.push({
charCode,
glyphId: glyphCode++,
});
}
}
} else {
warn("cmap table has unsupported format: " + format);
return {