Implemented Operation Stealth's version of addOverlay(objectIndex, overlayType).

svn-id: r32816

2 files changed, 15 insertions, 4 deletions

diff --git a/engines/cine/object.cpp b/engines/cine/object.cpp
index b00a636ae6..57a328eef9 100644
--- a/engines/cine/object.cpp
+++ b/engines/cine/object.cpp
@@ -99,21 +99,32 @@ int removeOverlay(uint16 objIdx, uint16 param) {
 
 /*! \brief Add new overlay sprite to the list
  * \param objIdx Associate the overlay with this object
- * \param param Type of new overlay
+ * \param type Type of new overlay
  * \todo Why are x, y, width and color left uninitialized?
  */
-void addOverlay(uint16 objIdx, uint16 param) {
+void addOverlay(uint16 objIdx, uint16 type) {
 	Common::List<overlay>::iterator it;
 	overlay tmp;
 
 	for (it = overlayList.begin(); it != overlayList.end(); ++it) {
+		// This is done for both Future Wars and Operation Stealth
 		if (objectTable[it->objIdx].mask >= objectTable[objIdx].mask) {
 			break;
 		}
+
+		// There are additional checks in Operation Stealth's implementation
+		if (g_cine->getGameType() == Cine::GType_OS && (it->type == 2 || it->type == 3)) {
+			break;
+		}
+	}
+
+	// In Operation Stealth's implementation we might bail out early
+	if (g_cine->getGameType() == Cine::GType_OS && it != overlayList.end() && it->objIdx == objIdx && it->type == type) {
+		return;
 	}
 
 	tmp.objIdx = objIdx;
-	tmp.type = param;
+	tmp.type = type;
 
 	overlayList.insert(it, tmp);
 }
diff --git a/engines/cine/object.h b/engines/cine/object.h
index 12e72927e1..103b2f50ba 100644
--- a/engines/cine/object.h
+++ b/engines/cine/object.h
@@ -60,7 +60,7 @@ void loadObject(char *pObjectName);
 void setupObject(byte objIdx, uint16 param1, uint16 param2, uint16 param3, uint16 param4);
 void modifyObjectParam(byte objIdx, byte paramIdx, int16 newValue);
 
-void addOverlay(uint16 objIdx, uint16 param);
+void addOverlay(uint16 objIdx, uint16 type);
 int removeOverlay(uint16 objIdx, uint16 param);
 void addGfxElement(int16 objIdx, int16 param, int16 type);
 void removeGfxElement(int16 objIdx, int16 param, int16 type);