Introduce GetScreenPosition

Source/engine/render/scrollrt.cpp

@@ -1510,6 +1510,20 @@ void CalcViewportGeometry()
 	tileColums = (screenWidth - renderStart.x + TILE_WIDTH - 1) / TILE_WIDTH;
 }
 
+Point GetScreenPosition(Point tile)
+{
+	Point firstTile = ViewPosition;
+	Displacement offset = {};
+	CalcFirstTilePosition(firstTile, offset);
+
+	Displacement delta = firstTile - tile;
+
+	Point position {};
+	position += delta.worldToScreen();
+	position += offset;
+	return position;
+}
+
 extern SDL_Surface *PalSurface;
 
 void ClearScreenBuffer()

Source/engine/render/scrollrt.h

@@ -60,6 +60,12 @@ void CalcTileOffset(int *offsetX, int *offsetY);
 void TilesInView(int *columns, int *rows);
 void CalcViewportGeometry();
 
+/**
+ * @brief Calculate the screen position of a given tile
+ * @param tile Position of a dungeon tile
+ */
+Point GetScreenPosition(Point tile);
+
 /**
  * @brief Render the whole screen black
  */