From 803969b928f85254e4518c44f20455ab0fdd7065 Mon Sep 17 00:00:00 2001
From: Paul Gilbert
Date: Fri, 31 Jul 2015 08:33:19 -0400
Subject: SHERLOCK: RT: Fix rendering of of scene masks

---
 engines/sherlock/tattoo/tattoo_user_interface.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'engines/sherlock/tattoo/tattoo_user_interface.cpp')

diff --git a/engines/sherlock/tattoo/tattoo_user_interface.cpp b/engines/sherlock/tattoo/tattoo_user_interface.cpp
index 77f2dc60df..36f00f31b2 100644
--- a/engines/sherlock/tattoo/tattoo_user_interface.cpp
+++ b/engines/sherlock/tattoo/tattoo_user_interface.cpp
@@ -655,7 +655,9 @@ void TattooUserInterface::doBgAnimEraseBackground() {
 	static const int16 OFFSETS[16] = { -1, -2, -3, -3, -2, -1, -1, 0, 1, 2, 3, 3, 2, 1, 0, 0 };
 
 	if (_mask != nullptr) {
-		screen.slamArea(0, 0, SHERLOCK_SCREEN_WIDTH, SHERLOCK_SCREEN_HEIGHT);
+		// Since a mask is active, restore the screen from the secondary back buffer prior to applying the mask
+		screen._backBuffer1.blitFrom(screen._backBuffer2, screen._currentScroll, Common::Rect(screen._currentScroll.x, 0, 
+			screen._currentScroll.x + SHERLOCK_SCREEN_WIDTH, SHERLOCK_SCREEN_HEIGHT));
 
 		switch (scene._currentScene) {
 		case 7:
-- 
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