Fix font cache collision identical metadata for different fonts #1330

Author: liborm85

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

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 {