diff --git a/headers/private/servers/app/DisplayDriver.h b/headers/private/servers/app/DisplayDriver.h
index c00f22f2aa..b866f345bc 100644
--- a/headers/private/servers/app/DisplayDriver.h
+++ b/headers/private/servers/app/DisplayDriver.h
@@ -78,6 +78,31 @@ typedef struct
 
 #endif
 
+class AccLineCalc
+{
+public:
+	AccLineCalc();
+	AccLineCalc(const BPoint &pta, const BPoint &ptb);
+	void SetPoints(const BPoint &pta, const BPoint &ptb);
+	float GetX(float y);
+	float GetY(float x);
+	float Slope(void) { return slope; }
+	float Offset(void) { return offset; }
+	float MinX();
+	float MinY();
+	float MaxX();
+	float MaxY();
+	void Swap(AccLineCalc &from);
+private:
+	float slope;
+	float offset;
+	BPoint start, end;
+	float minx;
+	float miny;
+	float maxx;
+	float maxy;
+};
+
 /*!
 	\class DisplayDriver DisplayDriver.h
 	\brief Mostly abstract class which handles all graphics output for the server.
@@ -170,6 +195,10 @@ protected:
 	void _SetDPMSCapabilities(uint32 caps);
 	void _SetDPMSState(uint32 state);
 	ServerCursor *_GetCursor(void);
+	virtual void HLine(int32 x1, int32 x2, int32 y, PatternHandler *pat);
+	virtual void HLineThick(int32 x1, int32 x2, int32 y, int32 thick, PatternHandler *pat);
+	virtual void SetPixel(int x, int y, RGBColor col);
+	virtual void SetThickPixel(int x, int y, int thick, PatternHandler *pat);
 
 private:
 	BLocker *_locker;
diff --git a/headers/private/servers/app/RGBColor.h b/headers/private/servers/app/RGBColor.h
index 896584b578..777a5c3e01 100644
--- a/headers/private/servers/app/RGBColor.h
+++ b/headers/private/servers/app/RGBColor.h
@@ -52,6 +52,7 @@ public:
 	void PrintToStream(void) const;
 	
 	uint8 GetColor8(void);
+	uint16 GetColor15(void);
 	uint16 GetColor16(void);
 	rgb_color GetColor32(void) const;
 	
@@ -71,8 +72,9 @@ public:
 protected:
 	rgb_color color32;
 	uint16 color16;
+	uint16 color15;
 	uint8 color8;
-	bool update8,update16;
+	bool update8,update15,update16;
 };
 
 #endif