From 7b3b9f6c359838e78e5cdc96f4cf778640ba67d0 Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Mon, 10 Nov 2014 08:04:57 -0800
Subject: [PATCH] Only allow layer 0 to be used as main framebuffer.

---
 Tweak.mm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Tweak.mm b/Tweak.mm
index 406b284..037f9ad 100644
--- a/Tweak.mm
+++ b/Tweak.mm
@@ -1042,7 +1042,10 @@ MSHook(kern_return_t, IOMobileFramebufferSwapSetLayer,
 ) {
     BOOL main;
 
-    if (_unlikely(buffer == NULL))
+    if (false);
+    else if (_unlikely(layer != 0))
+        main = false;
+    else if (_unlikely(buffer == NULL))
         main = fb == main_;
     else if (_unlikely(fb == NULL))
         main = false;
-- 
2.50.0