// LineStencil.h

#ifndef LineStencilh
#define LineStencilh

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "PixelBlock.h"

class CLineStencil {
  virtual WORD GetWidth() const =0;
  virtual WORD GetHeight() const =0;
  virtual DWORD* GetPointer(WORD x, WORD y) const =0;
  virtual void   SetPixel(WORD x, WORD y, DWORD Colour) =0;
  virtual void BlendPixel(WORD x, WORD y, DWORD Colour, BYTE Transparency) =0;
  void Swap(WORD& a, WORD& b) {WORD t=a; a=b; b=t;}
public:
  void Line(const CPoint& S, const CPoint& E, DWORD Colour);
  void Line(WORD x0, WORD y0, WORD x1, WORD y1, DWORD Colour);
};

class CLinePainter : public CPixelPainter, public CLineStencil {
  // Plug LineStencil into PixelPainter:
  WORD   GetWidth  ()                               const {return CPixelPainter::GetWidth();}
  WORD   GetHeight ()                               const {return CPixelPainter::GetHeight();}
  void   SetPixel  (WORD x, WORD y, DWORD Colour)         {CPixelPainter::SetPixel(x,y,Colour);}
  DWORD  GetPixel  (WORD x, WORD y, DWORD Colour=0) const {return CPixelPainter::GetPixel(x,y,Colour);}
  DWORD* GetPointer(WORD x, WORD y)                 const {return CPixelPainter::GetPointer(x,y);}
  void   BlendPixel(WORD x, WORD y, DWORD Colour, BYTE Transparency) {CPixelPainter::BlendPixel(x,y, Colour, Transparency);}
public:
  CLinePainter() {}
  virtual ~CLinePainter() {}
};

#endif // ndef LineStencilh