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LibPDF: Implement opcode 28 for CFF font programs

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Nico Weber 2023-10-18 09:26:31 -04:00 • committed by Tim Flynn
parent 44efff81b9
commit 4dc4de052a
1 changed files with 11 additions and 0 deletions
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11
Userland/Libraries/LibPDF/Fonts/Type1FontProgram.cpp
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@ -274,6 +274,17 @@ PDFErrorOr<Type1FontProgram::Glyph> Type1FontProgram::parse_glyph(ReadonlyBytes
TRY(push(((v - 247) * 256) + w + 108)); TRY(push(((v - 247) * 256) + w + 108));
} else if (v >= 32) { } else if (v >= 32) {
TRY(push(v - 139)); TRY(push(v - 139));
} else if (v == 28) {
if (is_type2) {
// Type 2 spec: "In addition to the 32 to 255 range of values, a ShortInt value is specified by using the operator (28)
// followed by two bytes which represent numbers between –32768 and +32767. The most significant byte follows the (28)."
TRY(require(2));
i16 a = static_cast<i16>((data[i + 1] << 8) | data[i + 2]);
i += 2;
TRY(push(a));
} else {
return error(DeprecatedString::formatted("CFF Subr command 28 only valid in type2 data"));
}
} else { } else {
// Not a parameter but a command byte. // Not a parameter but a command byte.
switch (v) { switch (v) {