From 84cc6cab53b8bd74f9b18b8bda91ab93765fcdc1 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 12 Sep 2018 08:47:44 +0530
Subject: [PATCH] PDF Output: Fix CSS opacity property causing text to not be
 rendered.  Now opacity is ignored, as it is unsupported by Qt WebKit. Fixes
 #1792048 [Text with opacity disappear after converting to
 PDF](https://bugs.launchpad.net/calibre/+bug/1792048)

---
 src/calibre/ebooks/pdf/render/from_html.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/calibre/ebooks/pdf/render/from_html.py b/src/calibre/ebooks/pdf/render/from_html.py
index 301139b348..093cca34a5 100644
--- a/src/calibre/ebooks/pdf/render/from_html.py
+++ b/src/calibre/ebooks/pdf/render/from_html.py
@@ -419,6 +419,10 @@ class PDFWriter(QObject):
 
         amap = json.loads(evaljs('''
         document.body.style.backgroundColor = "white";
+        // Qt WebKit cannot handle opacity with the Pdf backend
+        s = document.createElement('style');
+        s.textContent = '* {opacity: 1 !important}';
+        document.documentElement.appendChild(s);
         paged_display.set_geometry(1, %d, %d, %d);
         paged_display.layout();
         paged_display.fit_images();