Support format 12 CMAP of TrueType font #3738
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| @@ -898,9 +928,10 @@ var CmapTable = (function(_super) { | |||
| i = 0 <= tableCount ? ++i : --i | |||
| ) { | |||
| entry = new CmapEntry(data, this.offset); | |||
| if (Object.keys(entry.codeMap).length === 0) continue; | |||
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When TTF has the unsupported version of format CMAP, the entry with an empty codeMap is created, so I skip it.
| this.tables.push(entry); | ||
| if (entry.isUnicode) { | ||
| if (this.unicode == null) { | ||
| if (this.unicode == null || this.unicode.format < entry.format) { |
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Some codes refer this.tables[0], so when TTF has format 4 and 12, format 4 is referred.
To solve it, I sorted entries by format version
Father more, I think many people want to refer newer CMAP format version.
| if (codePoint > 0xffff) { | ||
| i++; | ||
| } |
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Skip later half of surrogate pair
| unicode = map[code]; | ||
| if (unicode > 0xffff) { | ||
| unicode -= 0x10000; | ||
| unicode = | ||
| ((unicode >> 10) + 0xd800).toString(16).padStart(4, "0") + | ||
| ((unicode % 0x400) + 0xdc00).toString(16).padStart(4, "0"); | ||
| } else { | ||
| unicode = unicode.toString(16).padStart(4, "0"); | ||
| } | ||
| code = (+code).toString(16).padStart(4, "0"); |
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This is an implementation for outputting surrogate pairs
I see PDF 1.3 specification because README says to follow PDF 1.3 specification.
It says that in 3.8.1
The remainder of the string consists of Unicode character codes, according to the UTF-16 encoding
specified in the Unicode standard, version 2.0.
So I output code as UTF-16 surrogate pairs encoding.
Fixes #3737
This change supports format 12 CMAP of TrueType font and adds test suites.
CmapEntrysupports format 12. Format 12 is simpler than format 4, so it's not a big change.utf8.jssupports surrogate pair.Before
After
