From f54b31fc5c7781b9351d631affda772742ba5a2a Mon Sep 17 00:00:00 2001
From: Abe Jellinek <jellinek@berkeley.edu>
Date: Thu, 29 Aug 2024 13:37:37 -0400
Subject: [PATCH] EPUB: Rewrite <object data> to <img src>

For https://github.com/sarabander/sicp
---
 epubjs/epub.js                          |  2 +-
 src/dom/epub/lib/sanitize-and-render.ts | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/epubjs/epub.js b/epubjs/epub.js
index a621d372..c8af9446 160000
--- a/epubjs/epub.js
+++ b/epubjs/epub.js
@@ -1 +1 @@
-Subproject commit a621d3727bc75ad7e49f2d70941dc969be65dd21
+Subproject commit c8af9446579aac722a0a86cb2bf44a5ee80100b4
diff --git a/src/dom/epub/lib/sanitize-and-render.ts b/src/dom/epub/lib/sanitize-and-render.ts
index 1b9166ae..91c9e17f 100644
--- a/src/dom/epub/lib/sanitize-and-render.ts
+++ b/src/dom/epub/lib/sanitize-and-render.ts
@@ -51,6 +51,22 @@ export async function sanitizeAndRender(xhtml: string, options: {
 		else if (elem.tagName == 'title') {
 			toRemove.push(elem);
 		}
+		else if (elem.tagName === 'object'
+				&& elem.hasAttribute('data')
+				&& elem.getAttribute("type")?.startsWith("image/")) {
+			// <object data="..."> apparently can't display blob: SVGs in Firefox
+			let img = doc.createElement('img');
+			for (let attr of elem.getAttributeNames()) {
+				if (attr === 'data' || attr === 'title') {
+					continue;
+				}
+				img.setAttribute(attr, elem.getAttribute(attr)!);
+			}
+			img.src = elem.getAttribute('data')!;
+			img.alt = elem.getAttribute('title') || elem.textContent || '';
+			elem.replaceWith(img);
+			walker.currentNode = img;
+		}
 	}
 
 	for (let elem of toRemove) {