From 7da077b93aff92f25eb41009891ac806de263ef4 Mon Sep 17 00:00:00 2001
From: Simei Yin
Date: Tue, 1 Aug 2017 09:29:34 +0200
Subject: SLUDGE: Clear screen before every display

---
 engines/sludge/graphics.cpp | 5 +++++
 engines/sludge/graphics.h   | 1 +
 engines/sludge/sludger.cpp  | 3 ++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/engines/sludge/graphics.cpp b/engines/sludge/graphics.cpp
index d0333bac8f..eecf52231f 100644
--- a/engines/sludge/graphics.cpp
+++ b/engines/sludge/graphics.cpp
@@ -144,6 +144,11 @@ void GraphicsManager::display() {
 	g_system->updateScreen();
 }
 
+void GraphicsManager::clear() {
+	_renderSurface.fillRect(Common::Rect(0, 0, _backdropSurface.w, _backdropSurface.h),
+			_renderSurface.format.RGBToColor(0, 0, 0));
+}
+
 bool GraphicsManager::loadParallax(uint16 v, uint16 fracX, uint16 fracY) {
 	if (!_parallaxStuff)
 		_parallaxStuff = new Parallax;
diff --git a/engines/sludge/graphics.h b/engines/sludge/graphics.h
index ecc2bbc21c..bb84b0b1fb 100644
--- a/engines/sludge/graphics.h
+++ b/engines/sludge/graphics.h
@@ -61,6 +61,7 @@ public:
 	void setWindowSize(uint winWidth, uint winHeight) { _winWidth = winWidth; _winHeight = winHeight; }
 	bool init();
 	void display();
+	void clear();
 
 	// Parallax
 	bool loadParallax(uint16 v, uint16 fracX, uint16 fracY);
diff --git a/engines/sludge/sludger.cpp b/engines/sludge/sludger.cpp
index 880c808a96..418ec31166 100644
--- a/engines/sludge/sludger.cpp
+++ b/engines/sludge/sludger.cpp
@@ -267,7 +267,8 @@ bool initSludge(const Common::String &filename) {
 }
 
 void displayBase() {
-	g_sludge->_gfxMan->drawBackDrop();// Draw the room
+	g_sludge->_gfxMan->clear(); // Clear screen
+	g_sludge->_gfxMan->drawBackDrop();// Draw Backdrop
 	g_sludge->_gfxMan->drawZBuffer(g_sludge->_gfxMan->getCamX(), g_sludge->_gfxMan->getCamY(), false);
 	drawPeople();// Then add any moving characters...
 	g_sludge->_gfxMan->displaySpriteLayers();
-- 
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