From df96abbe1016739b7d21dc0fb1df975a0321b6f3 Mon Sep 17 00:00:00 2001
From: Antonin Stefanutti <antonin@stefanutti.fr>
Date: Sat, 4 Nov 2023 16:52:43 +0100
Subject: [PATCH] Do not remove identical image references

---
 decktape.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/decktape.js b/decktape.js
index 99c31ca..ef7cc0c 100755
--- a/decktape.js
+++ b/decktape.js
@@ -458,9 +458,12 @@ async function printSlide(pdf, slide, context) {
     const subtype = object.dict.get(PDFName.of('Subtype'));
     if (subtype === PDFName.of('Image')) {
       const digest = crypto.createHash('SHA1').update(object.contents).digest('hex');
-      if (!context.pdfXObjects[digest]) {
+      const existing = context.pdfXObjects[digest];
+      if (!existing) {
+        // Store the entry that'll replace references with the same content
         context.pdfXObjects[digest] = entry;
-      } else {
+      } else if (entry !== existing) {
+        // Only remove references from different pages
         xObject.set(name, context.pdfXObjects[digest]);
         duplicatedEntries.push(entry);
       }