From cf177a0cde96b8aa50b5e6ad0e80437bb41983ac Mon Sep 17 00:00:00 2001
From: Vladimir <vladimir.burshnev@duallab.com>
Date: Wed, 7 Oct 2026 17:37:45 +0300
Subject: [PATCH] Extract descendant font refs

---
 src/core/catalog.js | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/core/catalog.js b/src/core/catalog.js
index 8f2d45ce5bdd5..36d19beedc404 100644
--- a/src/core/catalog.js
+++ b/src/core/catalog.js
@@ -2061,6 +2061,7 @@ class ExtendedCatalog extends Catalog {
     let actualFont = fontObj;
     let cidFontType = null;
     let normalizedSubtype = null;
+    let descendantRef = null;
     let baseFont = null;
     let cidBaseFont = null;
     let encoding = null;
@@ -2078,7 +2079,7 @@ class ExtendedCatalog extends Catalog {
 
         if (Array.isArray(descendantFonts) && descendantFonts.length > 0) {
           const cidFont = this.xref.fetchIfRef(descendantFonts[0]);
-
+          descendantRef = descendantFonts[0];
           if (cidFont instanceof Dict) {
             actualFont = cidFont;
 
@@ -2135,6 +2136,7 @@ class ExtendedCatalog extends Catalog {
       return {
         cidFontType,
         normalizedSubtype,
+        descendantRef,
         baseFont,
         cidBaseFont,
         encoding,
@@ -2148,6 +2150,7 @@ class ExtendedCatalog extends Catalog {
       return {
         cidFontType: null,
         normalizedSubtype: null,
+        descendantRef: null,
         baseFont: null,
         cidBaseFont: null,
         encoding: null,
@@ -2200,6 +2203,7 @@ class ExtendedCatalog extends Catalog {
             const {
               cidFontType,
               normalizedSubtype,
+              descendantRef,
               baseFont,
               encoding,
               isComposite,
@@ -2218,16 +2222,24 @@ class ExtendedCatalog extends Catalog {
             if (seenFonts.has(fontIdentity)) {
               const existing = seenFonts.get(fontIdentity);
               if (
-                !existing.refs.some(
+                !fontRef || !existing.refs.some(
                   r =>
                     r &&
-                    fontRef &&
                     r.num === fontRef.num &&
                     r.gen === fontRef.gen
                 )
               ) {
                 existing.refs.push(fontRef);
               }
+              if (
+                descendantRef && !existing.descendantRefs.some(
+                  r =>
+                    r.num === descendantRef.num &&
+                    r.gen === descendantRef.gen
+                )
+              ) {
+                existing.descendantRefs.push(descendantRef);
+              }
               existing.names[pageIndex] = fontName;
               continue;
             }
@@ -2235,6 +2247,7 @@ class ExtendedCatalog extends Catalog {
             const fontInfo = {
               names: { [pageIndex]: fontName },
               refs: [fontRef instanceof Ref ? fontRef : null],
+              descendantRefs: descendantRef instanceof Ref ? [descendantRef] : [],
               type: isComposite ? "Type0" : normalizedSubtype,
               subtype: normalizedSubtype,
               cidFontType,