CGraphicsContext Class

class CGraphicsContext

Encapsulates a Windows device context

Defined in: GraphicContext.h

Comments

The CGraphicsContext class is a very thin wrapper around the Device Context concept in Windows GDI, and its API.
Most of this class methods are just inline invocations of the corresponding API functions. The working details of each of those functions are not covered here. Please refer to your Windows Platform SDK documentation for more information.

Class Members

inline  CGraphicsContext(HDC h = NULL)

Attach constructor. Attaches the given DC handle to this instance.

inline  CGraphicsContext(const CGraphicsContext& rhs)

Copy constructor. Copies the contents of the given CGraphicsContext instance.

virtual  ~CGraphicsContext()

CGraphicsContext destructor.

CGraphicsContext& operator=(const CGraphicsContext& rhs)

Assignment operator

HDC operator HDC()

Casting operator.

inline virtual void  Attach(HDC h)

Attaches an existing device context handle to this instance of CGraphicsContext.

inline virtual HDC  Detach()

Terminates the relationship between this instance of CGraphicsContext and the contained DC handle, without releasing it.

inline virtual bool  Delete()

Causes the release of the contained DC handle. The actual release process is executed in ReleaseHandle, which must be implemented by all derived classes. CGraphicsContext instances do not release the DC handle, since they don't create it.

inline virtual bool  ReleaseHandle()

Override in derived classes to release the DC handle according to the process followed to create it. ReleaseHandle() is a noop in CGraphicsContext, since there is no creation mehanism associated.

inline CGDIObject&ltHGDIOBJ> SelectStockObject(int nIndex)

Selects one of Windows stock pens, brushes, fonts or palettes in the device context. Returns a generic CGDIObject containing the correspon- ding object that has been unselected as a result.

_GDIWrapper  SelectObject_GDIWrapper& aGDIObject

Select a GDI Object in the device context

_GDIWrapper  SelectObject_GDIWrapper* pGDIObject

Override needed to match the MFC Parameter types for SelectObject The different return type is OK and necessary

inline void SetOutputDC(HDC hDC)

Set the value of the Attribute DC Set the Attribute DC

inline void ReleaseAttribDC()

Change the value of the Output DC Set the Output DC

inline void ReleaseAttribDC()

Release the Attribute DC

inline void ReleaseOutputDC()

Release the Output DC

inline bool IsPrinting() const

true if being used for printing

inline bool CreateDC(LPCTSTR lpszDriverName, LPCTSTR lpszDeviceName,LPCTSTR lpszOutput, const void* lpInitData)

Creates a Graphics Context based for the device driver specified

inline bool CreateIC(LPCTSTR lpszDriverName, LPCTSTR lpszDeviceName, LPCTSTR lpszOutput, const void* lpInitData)

Creates an Information Context for print/preview purposes

inline bool CreateCompatibleDC(const CGraphicsContext* aDC)

Creates a DC compatible with the one passed in.

inline bool DeleteDC()

Releases the DC.

inline int SaveDC()

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inline bool RestoreDC(int nSavedDC)

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inline int GetDeviceCaps(int nIndex) const

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inline UINT SetBoundsRect(LPCRECT lpRectBounds, UINT flags)

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inline UINT GetBoundsRect(LPRECT lpRectBounds, UINT flags)

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inline bool ResetDC(const DEVMODE* lpDevMode)

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inline CPoint GetBrushOrg() const

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inline CPoint SetBrushOrg(int x, int y)

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inline CPoint SetBrushOrg(POINT point)

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inline int EnumObjects(int nObjectType,int (CALLBACK* lpfn)(LPVOID, LPARAM), LPARAM lpData)

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HDC GetSafeHdc()

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inline void StrokeScanPoints()

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inline void EndScanPoints()

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inline void FillScanPoints()

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inline void BeginScanPoints()

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inline void AddScanPoint(CPoint pt)

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inline COLORREF GetNearestColor(COLORREF crColor) const

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inline CGDIPalette SelectPalette(CGDIPalette& aPalette, bool bForceBackground)

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inline UINT RealizePalette()

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inline void UpdateColors()

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inline COLORREF GetBkColor() const

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inline int GetBkMode() const

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inline int GetPolyFillMode() const

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inline int GetROP2() const

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inline int GetStretchBltMode() const

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inline COLORREF GetTextColor() const

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inline COLORREF SetBkColor(COLORREF crColor)

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inline int SetBkMode(int nBkMode)

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inline int SetPolyFillMode(int nPolyFillMode)

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inline int SetROP2(int nDrawMode)

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inline int SetStretchBltMode(int nStretchMode)

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inline COLORREF SetTextColor(COLORREF crColor)

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inline bool GetColorAdjustment(LPCOLORADJUSTMENT lpColorAdjust) const

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inline bool SetColorAdjustment(const COLORADJUSTMENT* lpColorAdjust)

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inline int GetMapMode() const

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inline CPoint GetViewportOrg()

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inline int SetMapMode(int nMapMode)

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inline CPoint SetViewportOrg(int x, int y)

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inline CPoint SetViewportOrg(POINT point)

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inline CPoint OffsetViewportOrg(int nWidth, int nHeight)

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inline CSize GetViewportExt()

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inline CSize SetViewportExt(int cx, int cy)

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inline CSize SetViewportExt(SIZE size)

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inline CSize ScaleViewportExt(int xNum, int xDenom, int yNum, int yDenom)

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inline CPoint GetWindowOrg()

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inline CPoint SetWindowOrg(int x, int y)

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inline CPoint SetWindowOrg(POINT point)

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inline CPoint OffsetWindowOrg(int nWidth, int nHeight)

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inline CSize GetWindowExt()

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inline CSize SetWindowExt(int cx, int cy)

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inline CSize SetWindowExt(SIZE size)

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inline CSize ScaleWindowExt(int xNum, int xDenom, int yNum, int yDenom)

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inline void DPtoLP(LPPOINT lpPoints, int nCount = 1) const

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inline void DPtoLP(LPRECT lpRect) const

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inline void DPtoLP(LPSIZE lpSize) const

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inline void LPtoDP(LPPOINT lpPoints, int nCount = 1) const

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inline void LPtoDP(LPRECT lpRect) const

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inline void LPtoDP(LPSIZE lpSize) const

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inline void DPtoHIMETRIC(LPSIZE lpSize) const

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inline void LPtoHIMETRIC(LPSIZE lpSize) const

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inline void HIMETRICtoDP(LPSIZE lpSize) const

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inline void HIMETRICtoLP(LPSIZE lpSize) const

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inline bool FillRgn(CGDIRgn& aRgn, CGDIBrush& aBrush)

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inline bool FrameRgn(CGDIRgn& aRgn, CGDIBrush& aBrush, int nWidth, int nHeight)

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inline bool InvertRgn(CGDIRgn& aRgn)

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inline bool PaintRgn(CGDIRgn& aRgn)

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inline int GetClipBox(LPRECT lpRect) const

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inline bool PtVisible(int x, int y) const

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inline bool PtVisible(POINT point) const

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inline bool RectVisible(LPCRECT lpRect) const

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inline int SelectClipRgn(CGDIRgn& aRgn)

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inline int ExcludeClipRect(int x1, int y1, int x2, int y2)

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inline int ExcludeClipRect(LPCRECT lpRect)

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inline int IntersectClipRect(int x1, int y1, int x2, int y2)

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inline int IntersectClipRect(int x1, int y1, int x2, int y2)

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inline int IntersectClipRect(LPCRECT lpRect)

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inline int OffsetClipRgn(int x, int y)

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inline int OffsetClipRgn(SIZE size)

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inline CPoint GetCurrentPosition() const

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inline CPoint MoveTo(int x, int y)

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inline CPoint MoveTo(POINT point)

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inline bool LineTo(int x, int y)

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inline bool LineTo(POINT point)

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inline bool Arc(int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4)

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inline bool Arc(LPCRECT lpRect, POINT ptStart, POINT ptEnd)

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inline bool Polyline(LPPOINT lpPoints, int nCount)

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inline bool AngleArc(int x, int y, int nRadius, float fStartAngle, float fSweepAngle)

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inline bool ArcTo(int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4)

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inline bool ArcTo(LPCRECT lpRect, POINT ptStart, POINT ptEnd)

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inline int GetArcDirection() const

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inline int SetArcDirection(int nArcDirection)

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inline bool PolyDraw(const POINT* lpPoints, const BYTE* lpTypes, int nCount)

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inline bool PolylineTo(const POINT* lpPoints, int nCount)

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inline bool PolyPolyline(const POINT* lpPoints, const DWORD* lpPolyPoints, int nCount)

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inline bool PolyBezier(const POINT* lpPoints, int nCount)

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inline bool PolyBezierTo(const POINT* lpPoints, int nCount)

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inline void FillRect(LPCRECT lpRect, CGDIBrush* pBrush)

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inline void FrameRect(LPCRECT lpRect, CGDIBrush* pBrush)

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inline void InvertRect(LPCRECT lpRect)

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inline bool DrawIcon(int x, int y, HICON hIcon)

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inline bool DrawIcon(POINT point, HICON hIcon)

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inline bool DrawState(CPoint pt, CSize size, HBITMAP hBitmap, UINT nFlags,HBRUSH hBrush = NULL)

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inline bool DrawState(CPoint pt, CSize size, HICON hIcon, UINT nFlags,HBRUSH hBrush = NULL)

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inline bool DrawState(CPoint pt, CSize size, LPCTSTR lpszText, UINT nFlags,bool bPrefixText = TRUE, int nTextLen = 0, HBRUSH hBrush = NULL)

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inline bool DrawState(CPoint pt, CSize size, DRAWSTATEPROC lpDrawProc,LPARAM lData, UINT nFlags, HBRUSH hBrush = NULL)

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inline bool Chord(LPCRECT lpRect, POINT ptStart, POINT ptEnd)

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inline bool Chord(int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4)

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inline void DrawFocusRect(LPCRECT lpRect)

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inline bool Ellipse(LPCRECT lpRect)

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inline bool Ellipse(int x1, int y1, int x2, int y2)

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inline bool Pie(int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4)

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inline bool Pie(LPCRECT lpRect, POINT ptStart, POINT ptEnd)

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inline bool Polygon(LPPOINT lpPoints, int nCount)

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inline bool PolyPolygon(LPPOINT lpPoints, LPINT lpPolyCounts, int nCount)

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inline bool Rectangle(int x1, int y1, int x2, int y2)

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inline bool Rectangle(LPCRECT lpRect)

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inline bool RoundRect(int x1, int y1, int x2, int y2, int x3, int y3)

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inline bool RoundRect(LPCRECT lpRect, POINT point)

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inline bool PatBlt(int x, int y, int nWidth, int nHeight, DWORD dwRop)

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inline bool BitBlt(int x, int y, int nWidth, int nHeight, CGraphicsContext& aSrcGC, int xSrc, int ySrc, DWORD dwRop)

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inline bool StretchBlt(int x, int y, int nWidth, int nHeight, CGraphicsContext& aSrcGC, int xSrc, int ySrc, int nSrcWidth, int nSrcHeight, DWORD dwRop)

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inline bool TransparentBlt(int nXOriginDest, int nYOriginDest, int nWidthDest, int hHeightDest, CGraphicsContext& aSrcGC, int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc, UINT crTransparent)

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inline bool TransparentBlt(CRect rcDst, CGraphicsContext& aSrcGC, CRect rcSrc, UINT crTransparent)

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inline bool MaskBlt(int x, int y, int nWidth, int nHeight, CGraphicsContext& aSrcGC, int xSrc, int ySrc, CGDIBitmap& aBmpMask, int xMask, int yMask, DWORD dwRop)

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inline bool MaskBlt(CRect rcDst, CGraphicsContext& aSrcGC, CPoint ptSrc, CGDIBitmap& aBmpMask, CPoint ptMaskOffset, DWORD dwRop)

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inline bool PlgBlt(LPPOINT lpPoint, CGraphicsContext& aSrcGC, int xSrc, int ySrc, int nWidth, int nHeight, CGDIBitmap& aBmpMask, int xMask, int yMask)

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inline COLORREF GetPixel(int x, int y) const

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inline COLORREF GetPixel(POINT point) const

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inline COLORREF SetPixel(int x, int y, COLORREF crColor)

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inline COLORREF SetPixel(POINT point, COLORREF crColor)

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inline bool FloodFill(int x, int y, COLORREF crColor)

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inline bool ExtFloodFill(int x, int y, COLORREF crColor, UINT nFillType)

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inline bool SetPixelV(int x, int y, COLORREF crColor)

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inline bool SetPixelV(POINT point, COLORREF crColor)

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inline bool TextOut(int x, int y, LPCTSTR lpszString, int nCount)

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inline bool ExtTextOut(int x, int y, UINT nOptions, LPCRECT lpRect,LPCTSTR lpszString, UINT nCount, LPINT lpDxWidths)

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inline CSize TabbedTextOut(int x, int y, LPCTSTR lpszString, int nCount,int nTabPositions, LPINT lpnTabStopPositions, int nTabOrigin)

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inline int DrawText(LPCTSTR lpszString, int nCount, LPRECT lpRect, UINT nFormat = 0)

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inline int DrawTextEx(LPTSTR lpszString, int nCount, LPRECT lpRect, UINT nFormat = 0, LPDRAWTEXTPARAMS lpDTParams = NULL)

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inline CSize GetTextExtent(LPCTSTR lpszString, int nCount) const

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inline CSize GetOutputTextExtent(LPCTSTR lpszString, int nCount) const

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inline CSize GetTabbedTextExtent(LPCTSTR lpszString, int nCount,int nTabPositions, LPINT lpnTabStopPositions) const

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inline CSize GetOutputTabbedTextExtent(LPCTSTR lpszString, int nCount,int nTabPositions, LPINT lpnTabStopPositions) const

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inline bool GrayString(CGDIBrush& aBrush, BOOL (CALLBACK* lpfnOutput)(HDC, LPARAM, int), LPARAM lpData,int nCount, int x, int y, int nWidth, int nHeight)

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inline UINT GetTextAlign() const

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inline UINT SetTextAlign(UINT nFlags)

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inline int GetTextFace(int nCount, LPTSTR lpszFacename) const

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inline bool GetTextMetrics(LPTEXTMETRIC lpMetrics) const

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inline bool GetOutputTextMetrics(LPTEXTMETRIC lpMetrics) const

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inline int SetTextJustification(int nBreakExtra, int nBreakCount)

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inline int GetTextCharacterExtra() const

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inline int SetTextCharacterExtra(int nCharExtra)

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inline bool DrawEdge(LPRECT lpRect, UINT nEdge, UINT nFlags)

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inline bool DrawFrameControl(LPRECT lpRect, UINT nType, UINT nState)

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inline bool ScrollDC(int dx, int dy, LPCRECT lpRectScroll, LPCRECT lpRectClip, CGDIRgn& aRgnUpdate, LPRECT lpRectUpdate)

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inline bool GetCharWidth(UINT nFirstChar, UINT nLastChar, LPINT lpBuffer) const

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inline bool GetOutputCharWidth(UINT nFirstChar, UINT nLastChar, LPINT lpBuffer) const

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inline DWORD SetMapperFlags(DWORD dwFlag)

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inline CSize GetAspectRatioFilter() const

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inline bool GetCharABCWidths(UINT nFirstChar, UINT nLastChar, LPABC lpabc) const

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inline DWORD GetFontData(DWORD dwTable, DWORD dwOffset, LPVOID lpData, DWORD cbData) const

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inline int GetKerningPairs(int nPairs, LPKERNINGPAIR lpkrnpair) const

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inline UINT GetOutlineTextMetrics(UINT cbData, LPOUTLINETEXTMETRIC lpotm) const

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inline DWORD GetGlyphOutline(UINT nChar, UINT nFormat, LPGLYPHMETRICS lpgm,DWORD cbBuffer, LPVOID lpBuffer, const MAT2* lpmat2) const

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inline bool GetCharABCWidths(UINT nFirstChar, UINT nLastChar, LPABCFLOAT lpABCF) const

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inline bool GetCharWidth(UINT nFirstChar, UINT nLastChar, float* lpFloatBuffer) const

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inline int Escape(int nEscape, int nCount,LPCSTR lpszInData, LPVOID lpOutData)

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inline int Escape(int nEscape, int nInputSize, LPCSTR lpszInputData,int nOutputSize, LPSTR lpszOutputData)

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inline int DrawEscape(int nEscape, int nInputSize, LPCSTR lpszInputData)

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inline int StartDoc(LPDOCINFO lpDocInfo)

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inline int StartDoc(LPDOCINFO lpDocInfo)

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inline int StartPage()

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inline int EndPage()

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inline int SetAbortProc(BOOL (CALLBACK* lpfn)(HDC, int))

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inline int AbortDoc()

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inline int EndDoc()

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inline bool PlayMetaFile(HMETAFILE hMF)

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inline bool PlayMetaFile(HENHMETAFILE hEnhMetaFile, LPCRECT lpBounds)

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inline bool AddMetaFileComment(UINT nDataSize, const BYTE* pCommentData)

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inline bool AbortPath()

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inline bool BeginPath()

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inline bool CloseFigure()

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inline bool EndPath()

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inline bool FillPath()

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inline bool FlattenPath()

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inline bool StrokeAndFillPath()

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inline bool StrokePath()

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inline bool WidenPath()

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inline float GetMiterLimit() const

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inline bool SetMiterLimit(float fMiterLimit)

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inline int GetPath(LPPOINT lpPoints, LPBYTE lpTypes, int nCount) const

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inline bool SelectClipPath(int nMode)

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inline void DrawDragRect(LPCRECT pRect, SIZE size, LPCRECT pRectLast, SIZE sizeLast, const CGDIBrush& aBrush = CGDIBrush(), const CGDIBrush& aBrushLast = CGDIBrush())

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inline void FillSolidRect(LPCRECT lpRect, COLORREF clr)

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inline void FillSolidRect(int x, int y, int cx, int cy, COLORREF clr)

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inline void Draw3dRect(LPCRECT lpRect, COLORREF clrTopLeft, COLORREF clrBottomRight)

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inline void Draw3dRect(int x, int y, int cx, int cy, COLORREF clrTopLeft, COLORREF clrBottomRight)

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inline virtual void AdjustViewport()

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