4 files changed, 39 insertions, 1 deletions
diff --git a/engines/sci/gui/gui.cpp b/engines/sci/gui/gui.cpp
index e0fd24471f..8fe0243f41 100644
--- a/engines/sci/gui/gui.cpp
+++ b/engines/sci/gui/gui.cpp
@@ -228,7 +228,6 @@ void SciGUI::textColors(int argc, reg_t *argv) {
 
 void SciGUI::drawPicture(sciResourceId pictureId, uint16 style, uint16 flags, int16 EGApaletteNo) {
 	bool addToFlag = flags ? true : false;
-
 	sciPort *oldPort = _gfx->SetPort((sciPort *)_windowMgr->_picWind);
 
 	if (_windowMgr->isFrontWindow(_windowMgr->_picWind)) {
@@ -317,6 +316,15 @@ void SciGUI::paletteAnimate(int fromColor, int toColor, int speed) {
 	_gfx->animatePalette(fromColor, toColor, speed);
 }
 
+int16 SciGUI::onControl(byte screenMask, Common::Rect rect) {
+	sciPort *oldPort = _gfx->SetPort((sciPort *)_windowMgr->_picWind);
+	int16 result;
+
+	result = _gfx->onControl(screenMask, rect);
+	_gfx->SetPort(oldPort);
+	return result;
+}
+
 void SciGUI::moveCursor(int16 x, int16 y) {
 	Common::Point newPos;
 	sciPort *curPort = _gfx->GetPort();
diff --git a/engines/sci/gui/gui.h b/engines/sci/gui/gui.h
index 713db08bd5..de2353733e 100644
--- a/engines/sci/gui/gui.h
+++ b/engines/sci/gui/gui.h
@@ -74,6 +74,8 @@ public:
 	virtual int16 paletteFind(int r, int g, int b);
 	virtual void paletteAnimate(int fromColor, int toColor, int speed);
 
+	virtual int16 onControl(byte screenMask, Common::Rect rect);
+
 	virtual void moveCursor(int16 x, int16 y);
 
 private:
diff --git a/engines/sci/gui/gui_gfx.cpp b/engines/sci/gui/gui_gfx.cpp
index 413939528b..fe1be61d80 100644
--- a/engines/sci/gui/gui_gfx.cpp
+++ b/engines/sci/gui/gui_gfx.cpp
@@ -1268,4 +1268,30 @@ void SciGUIgfx::animatePalette(byte fromColor, byte toColor, int speed) {
 	_palSchedules.push_back(sched);
 }
 
+int16 SciGUIgfx::onControl(uint16 screenMask, Common::Rect rect) {
+	Common::Rect outRect(rect.left, rect.top, rect.right, rect.bottom);
+	int16 x, y;
+	int16 result = 0;
+
+	outRect.clip(_curPort->rect);
+	if (outRect.isEmpty()) // nothing to control
+		return 0;
+	OffsetRect(outRect);
+
+	if (screenMask & SCI_SCREEN_MASK_PRIORITY) {
+		for (y = outRect.top; y < outRect.bottom; y++) {
+			for (x = outRect.left; x < outRect.right; x++) {
+				result |= 1 << _screen->Get_Priority(x, y);
+			}
+		}
+	} else {
+		for (y = outRect.top; y < outRect.bottom; y++) {
+			for (x = outRect.left; x < outRect.right; x++) {
+				result |= 1 << _screen->Get_Control(x, y);
+			}
+		}
+	}
+	return result;
+}
+
 } // end of namespace Sci
diff --git a/engines/sci/gui/gui_gfx.h b/engines/sci/gui/gui_gfx.h
index 7ff89bb7ac..018b86090a 100644
--- a/engines/sci/gui/gui_gfx.h
+++ b/engines/sci/gui/gui_gfx.h
@@ -112,6 +112,8 @@ public:
 
 	void animatePalette(byte fromColor, byte toColor, int speed);
 
+	int16 onControl(uint16 screenMask, Common::Rect rect);
+
 	sciPort *_menuPort;
 	uint32 _sysTicks;
 	int32 _sysSpeed; // ticker timer in ms