From 14f0e88910ccdea7998d82a814e357a5acb5c7c7 Mon Sep 17 00:00:00 2001
From: Calixte Denizet <calixte.denizet@gmail.com>
Date: Sat, 7 Jun 2025 21:17:26 +0200
Subject: [PATCH] Fix a printing issue on Mac (bug 1961423)

On mac, the pdf backend used when printing is using the cid from the font,
so if a char has null cid then it's equivalent to .notdef and some viewers
don't display it.
---
 src/core/cff_parser.js       | 4 ++--
 test/unit/cff_parser_spec.js | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/core/cff_parser.js b/src/core/cff_parser.js
index 00db63f97..61dcfa2a5 100644
--- a/src/core/cff_parser.js
+++ b/src/core/cff_parser.js
@@ -1770,13 +1770,13 @@ class CFFCompiler {
       // In a CID font, the charset is a mapping of CIDs not SIDs so just
       // create an identity mapping.
       // nLeft: Glyphs left in range (excluding first) (see the CFF specs).
-      // Having a wrong value for nLeft induces a print issue on MacOS (see
+      // The first CID must be 1 in order to avoid a print issue on mac (see
       // https://bugzilla.mozilla.org/1961423).
       const nLeft = numGlyphsLessNotDef - 1;
       out = new Uint8Array([
         2, // format
         0, // first CID upper byte
-        0, // first CID lower byte
+        1, // first CID lower byte
         (nLeft >> 8) & 0xff,
         nLeft & 0xff,
       ]);
diff --git a/test/unit/cff_parser_spec.js b/test/unit/cff_parser_spec.js
index c15e4acf5..98a9418c8 100644
--- a/test/unit/cff_parser_spec.js
+++ b/test/unit/cff_parser_spec.js
@@ -479,7 +479,7 @@ describe("CFFCompiler", function () {
     expect(out).toEqual([
       2, // format
       0, // cid (high)
-      0, // cid (low)
+      1, // cid (low)
       0, // nLeft (high)
       numGlyphs - 2, // nLeft (low)
     ]);