From 704a005ac246488142036bec0c5f59c7d15d017d Mon Sep 17 00:00:00 2001
From: "Libor M." <liborm85@gmail.com>
Date: Sat, 28 Dec 2024 13:34:00 +0100
Subject: [PATCH] Fix font cache collision identical metadata for different
 fonts #1330

---
 CHANGELOG.md        |  2 +-
 lib/mixins/fonts.js | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5983bc2b..15d43f2d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@
 - Add support to scale text horizontally
 - Add an option to keep the indentation after a new line starts and allow to indent a whole paragraph/text element
 - Fix sets tab order to "Structure" when a document is tagged
-- Fix font cache collision for fonts with missing postscript name or bad TTF metadata
+- Fix font cache collision for fonts with missing postscript name or bad TTF metadata or identical metadata for different fonts
 - Fix measuring text when OpenType features are passed in to .text()
 
 ### [v0.15.2] - 2024-12-15
diff --git a/lib/mixins/fonts.js b/lib/mixins/fonts.js
index b8a8295d..3a6e85fc 100644
--- a/lib/mixins/fonts.js
+++ b/lib/mixins/fonts.js
@@ -1,8 +1,17 @@
 import PDFFontFactory from '../font_factory';
 
 const isEqualFont = (font1, font2) => {
+  // compare font checksum
+  if (font1.font._tables?.head?.checkSumAdjustment !== font2.font._tables?.head?.checkSumAdjustment) {
+    return false;
+  }
+
   // compare font name table
-  return (JSON.stringify(font1.font._tables?.name?.records) === JSON.stringify(font2.font._tables?.name?.records))
+  if (JSON.stringify(font1.font._tables?.name?.records) !== JSON.stringify(font2.font._tables?.name?.records)) {
+    return false;
+  }
+
+  return true;
 }
 
 export default {