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Merge pull request #8592 from brendandahl/cmap-3-0

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Only mask char codes of (3, 0) cmap tables in the range of 0xF000 to 0…
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Brendan Dahl 2017-07-03 17:58:28 -07:00 • committed by GitHub
commit 9f5c1550ed
4 changed files with 24 additions and 14 deletions
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30
src/core/fonts.js
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@ -2406,21 +2406,23 @@ var Font = (function FontClosure() {
cmapMappings[i].glyphId;
}
} else {
// For (3, 0) cmap tables:
// The charcode key being stored in charCodeToGlyphId is the lower
// byte of the two-byte charcodes of the cmap table since according to
// the spec: 'each byte from the string shall be prepended with the
// high byte of the range [of charcodes in the cmap table], to form
// a two-byte character, which shall be used to select the
// associated glyph description from the subtable'.
//
// For (1, 0) cmap tables:
// 'single bytes from the string shall be used to look up the
// associated glyph descriptions from the subtable'. This means
// charcodes in the cmap will be single bytes, so no-op since
// glyph.charCode & 0xFF === glyph.charCode
// When there is only a (1, 0) cmap table, the char code is a single
// byte and it is used directly as the char code.
// When a (3, 0) cmap table is present, it is used instead but the
// spec has special rules for char codes in the range of 0xF000 to
// 0xF0FF and it says the (3, 0) table should map the values from
// the (1, 0) table by prepending 0xF0 to the char codes. To reverse
// this, the upper bits of the char code are cleared, but only for the
// special range since some PDFs have char codes outside of this range
// (e.g. 0x2013) which when masked would overwrite other values in the
// cmap.
for (i = 0; i < cmapMappingsLength; ++i) {
charCode = cmapMappings[i].charCode & 0xFF;
charCode = cmapMappings[i].charCode;
if (cmapPlatformId === 3 &&
charCode >= 0xF000 && charCode <= 0xF0FF) {
charCode &= 0xFF;
}
charCodeToGlyphId[charCode] = cmapMappings[i].glyphId;
}
}