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SDLmm::BaseSurface(3)	   Library Functions Manual	 SDLmm::BaseSurface(3)

NAME
       SDLmm::BaseSurface - An abstract	base class for graphical surfaces.

SYNOPSIS
       #include	<sdlmm_basesurface.h>

       Inherited by SDLmm::Display, and	SDLmm::Surface.

   Public Methods
       virtual ~BaseSurface ()
	   The destructor.
       SDL_Surface* GetSurface ()
       const SDL_Surface* GetSurface ()	const
       bool Lock ()
	   Lock	the surface to allow direct access to the surface pixels.
	   Returns true	if lock	succeeded, false otherwise.
       void Unlock ()
	   Unlock the surface.
       void SetPixel (int x, int y, Color color)
	   Set the pixel to the	color.
       void SetPixel1 (int x, int y, Color color)
	   Set the pixel to the	color.
       void SetPixel2 (int x, int y, Color color)
	   Set the pixel to the	color.
       void SetPixel3 (int x, int y, Color color)
	   Set the pixel to the	color.
       void SetPixel4 (int x, int y, Color color)
	   Set the pixel to the	color.
       void SetPixel (const SRect &point, Color	color)
	   Set the pixel to the	color.
       Color GetPixel (int x, int y) const
	   Get the color of the	pixel.
       Color GetPixel (const SRect &point) const
	   Get the color of the	pixel.
       bool SetColorKey	(Uint32	flag, Color key)
	   Sets	the color key (transparent pixel) in a blittable surface and
	   enables or disables RLE blit	acceleration.
       bool SetAlpha (Uint32 flag, Uint8 alpha)
	   Adjust the alpha properties of this surface.
       virtual bool SetDisplayFormat ()=0
	   Convert the surface to the display format.
       virtual bool SetDisplayFormatAlpha ()=0
	   Convert the surface to the display format.
       bool SaveBMP (const char	*file) const
	   Save	a BaseSurface object as	a Windows bitmap file.
       bool SaveBMP (const std::string &file) const
	   Save	a BaseSurface object as	a Windows bitmap file.

       Informational methods

	   bool	valid () const
	       Returns true if this surface is initialized, false otherwise.
	   Uint32 flags	() const
	       Returns the surface flags.
	   const PixelFormat GetPixelFormat () const
	       Returns the pixel format.
	   PixelFormat GetPixelFormat ()
	   int w () const
	       Returns the width of the	surface.
	   int h () const
	       Returns the height of the surface.
	   Uint16 pitch	() const
	       Returns the scanline length in bytes.
	   const SRect clip_rect () const
	       Returns the surface clip	rectangle.
	   void* pixels	()
	       Returns the pixel data, which can be used for low-level
	       manipulation.
	   const void* pixels () const
	       Returns the pixel data, which can be used for low-level
	       manipulation.
	   struct private_hwdata* hwdata () const
	       Returns the hardware-specific surface info.

       Clipping	Methods

	   void	ResetClipRect ()
	       Resets the clipping rectangle for the surface.
	   void	SetClipRect (const SDL_Rect &rect)
	       Sets the	clipping rectangle for the surface.
	   void	GetClipRect (SDL_Rect &rect) const
	       Gets the	clipping rectangle for the surface.

       Blitting	/ Filling

	   int Blit (const BaseSurface &src)
	       Fast blit the entire source surface onto	this surface.
	   int Blit (const BaseSurface &src, SDL_Rect &dstrect)
	       Fast blit the entire source surface onto	this surface at	the
	       specified coordinates.
	   int Blit (const BaseSurface &src, const SPoint &dstpoint, SDL_Rect
	       &dstrect)
	       Fast blit the entire source surface onto	this surface at	the
	       specified coordinates.
	   int Blit (const BaseSurface &src, const SPoint &dstpoint)
	       Fast blit the entire source surface onto	this surface at	the
	       specified coordinates.
	   int Blit (const BaseSurface &src, const SDL_Rect &srcrect, SDL_Rect
	       &dstrect)
	       Fast blit the specified area part of the	source surface onto
	       this surface at the specified coordinates.
	   int Blit (const BaseSurface &src, const SDL_Rect &srcrect, const
	       SPoint &dstpoint, SDL_Rect &dstrect)
	       Fast blit the specified area part of the	source surface onto
	       this surface at the specified coordinates.
	   int Blit (const BaseSurface &src, const SDL_Rect &srcrect, const
	       SPoint &dstpoint)
	       Fast blit the specified area part of the	source surface onto
	       this surface at the specified coordinates.
	   bool	Fill (Color color)
	       Fast fill the surface with the specified	color.
	   bool	Fill (Uint8 r, Uint8 g,	Uint8 b)
	       Fast fill the surface with the specified	color.
	   bool	Fill (Uint8 r, Uint8 g,	Uint8 b, Uint8 a)
	       Fast fill the surface with the specified	color.
	   bool	FillRect (SDL_Rect &dstrect, Color color)
	       Performs	a fast fill of the given rectangle with	the specified
	       color.
	   bool	FillRect (SDL_Rect &dstrect, Uint8 r, Uint8 g, Uint8 b)
	       Performs	a fast fill of the given rectangle with	the specified
	       color.
	   bool	FillRect (SDL_Rect &dstrect, Uint8 r, Uint8 g, Uint8 b,	Uint8
	       a)
	       Performs	a fast fill of the given rectangle with	the specified
	       color.

   Protected Methods
       virtual void SetSurface (SDL_Surface *surface)
       BaseSurface (SDL_Surface	*surface)
	   Constructor from an SDL_Surface*.
       BaseSurface (const BaseSurface &other)
       BaseSurface& operator= (const BaseSurface &other)

   Protected Attributes
       SDL_Surface* me
	   The actual SDL_Surface allocated for	this BaseSurface.

DETAILED DESCRIPTION
       An abstract base	class for graphical surfaces.

       Surfaces	represent areas	of 'graphical' memory, memory that can be
       drawn to. The video framebuffer is returned as a	VideoSurface by
       SetVideoMode() and GetVideoSurface(). Ordinary (non-framebuffer
       surfaces) are represented by a Surface. The clipping rectangle returned
       by clip_rect() can be set with SetClipRect() method.

       Author:
	   David Hedbor	<david@hedbor.org>

CONSTRUCTOR & DESTRUCTOR DOCUMENTATION
   SDLmm::BaseSurface::BaseSurface (SDL_Surface	* surface) [inline, explicit,
       protected]
       Constructor from	an SDL_Surface*.

       This creates a new BaseSurface object from an existing SDL_Surface.
       Note that ownership of the SDL_Surface is passed	on to the BaseSurface.
       It's very important not to free the original surface since that will
       cause a problem when the	object is destructed (SDL_Surface storage
       freed twice). Use with caution.

   SDLmm::BaseSurface::BaseSurface (const BaseSurface &	other) [inline,
       protected]
   SDLmm::BaseSurface::~BaseSurface () [inline,	virtual]
       The destructor.

MEMBER FUNCTION	DOCUMENTATION
   int SDLmm::BaseSurface::Blit	(const BaseSurface & src, const	SDL_Rect &
       srcrect,	const SPoint & dstpoint)
       Fast blit the specified area part of the	source surface onto this
       surface at the specified	coordinates.

       The choosen rectangle of	the source surface will	be blitted to this
       surface.	If the source area is larger than the destination, clipping
       will occur. No scaling will be performed. Blitting should not be	used
       on a locked surface. The	entire surface will be copied to this surface
       using this function.

       Returns:
	   If the blit is successful, it returns 0, otherwise it returns -1.
	   If either of	the surfaces were in video memory, and the blit
	   returns -2, the video memory	was lost. It should be reloaded	with
	   artwork and re-blitted.

       Parameters:

       src    the surface to blit from.

       srcrect
	      the rectangular area to copy from	the source surface.

       dstpoint
	      the destination coordinates.

   int SDLmm::BaseSurface::Blit	(const BaseSurface & src, const	SDL_Rect &
       srcrect,	const SPoint & dstpoint, SDL_Rect & dstrect) [inline]
       Fast blit the specified area part of the	source surface onto this
       surface at the specified	coordinates.

       The choosen rectangle of	the source surface will	be blitted to this
       surface.	If the source area is larger than the destination, clipping
       will occur. No scaling will be performed. Blitting should not be	used
       on a locked surface. The	entire surface will be copied to this surface
       using this function. The	final blit rectangle is	saved in dstrect after
       all clipping is performed (srcrect is not modified).

       Returns:
	   If the blit is successful, it returns 0, otherwise it returns -1.
	   If either of	the surfaces were in video memory, and the blit
	   returns -2, the video memory	was lost. It should be reloaded	with
	   artwork and re-blitted.

       Parameters:

       src    the surface to blit from.

       srcrect
	      the rectangular area to copy from	the source surface.

       dstpoint
	      the destination coordinates.

       dstrect
	      the final	position and size is set upon returning.

   int SDLmm::BaseSurface::Blit	(const BaseSurface & src, const	SDL_Rect &
       srcrect,	SDL_Rect & dstrect)
       Fast blit the specified area part of the	source surface onto this
       surface at the specified	coordinates.

       The choosen rectangle of	the source surface will	be blitted to this
       surface.	If the source area is larger than the destination, clipping
       will occur. No scaling will be performed. Blitting should not be	used
       on a locked surface. The	entire surface will be copied to this surface
       using this function. The	final blit rectangle is	saved in dstrect after
       all clipping is performed (srcrect is not modified).

       Returns:
	   If the blit is successful, it returns 0, otherwise it returns -1.
	   If either of	the surfaces were in video memory, and the blit
	   returns -2, the video memory	was lost. It should be reloaded	with
	   artwork and re-blitted.

       Parameters:

       src    the surface to blit from.

       srcrect
	      the rectangular area to copy from	the source surface.

       dstrect
	      the destination coordinates. Only	the position  is used (i.e
	      width and	height are ignored). The width and height are set upon
	      returning.

   int SDLmm::BaseSurface::Blit	(const BaseSurface & src, const	SPoint &
       dstpoint)
       Fast blit the entire source surface onto	this surface at	the specified
       coordinates.

       The source surface will be blitted to this surface. If the source area
       is larger than the destination, clipping	will occur. No scaling will be
       performed. Blitting should not be used on a locked surface. The entire
       surface will be copied to this surface using this function.

       Returns:
	   If the blit is successful, it returns 0, otherwise it returns -1.
	   If either of	the surfaces were in video memory, and the blit
	   returns -2, the video memory	was lost. It should be reloaded	with
	   artwork and re-blitted.

       Parameters:

       src    the surface to blit from.

       dstpoint
	      the destination coordinates.

   int SDLmm::BaseSurface::Blit	(const BaseSurface & src, const	SPoint &
       dstpoint, SDL_Rect & dstrect) [inline]
       Fast blit the entire source surface onto	this surface at	the specified
       coordinates.

       The source surface will be blitted to this surface. If the source area
       is larger than the destination, clipping	will occur. No scaling will be
       performed. Blitting should not be used on a locked surface. The entire
       surface will be copied to this surface using this function. The final
       blit rectangle is saved in dstrect after	all clipping is	performed.

       Returns:
	   If the blit is successful, it returns 0, otherwise it returns -1.
	   If either of	the surfaces were in video memory, and the blit
	   returns -2, the video memory	was lost. It should be reloaded	with
	   artwork and re-blitted.

       Parameters:

       src    the surface to blit from.

       dstpoint
	      the destination coordinates.

       dstrect
	      the final	position and size is set upon returning.

   int SDLmm::BaseSurface::Blit	(const BaseSurface & src, SDL_Rect & dstrect)
       Fast blit the entire source surface onto	this surface at	the specified
       coordinates.

       The source surface will be blitted to this surface. If the source area
       is larger than the destination, clipping	will occur. No scaling will be
       performed. Blitting should not be used on a locked surface. The entire
       surface will be copied to this surface using this function. The final
       blit rectangle is saved in dstrect after	all clipping is	performed.

       Returns:
	   If the blit is successful, it returns 0, otherwise it returns -1.
	   If either of	the surfaces were in video memory, and the blit
	   returns -2, the video memory	was lost. It should be reloaded	with
	   artwork and re-blitted.

       Parameters:

       src    the surface to blit from.

       dstrect
	      the destination coordinates. Only	the position  is used (i.e
	      width and	height are ignored). The width and height are set upon
	      returning.

   int SDLmm::BaseSurface::Blit	(const BaseSurface & src)
       Fast blit the entire source surface onto	this surface.

       The source surface will be blitted to this surface. If the source area
       is larger than the destination, clipping	will occur. No scaling will be
       performed. Blitting should not be used on a locked surface. The entire
       surface will be copied to this surface using this function.

       Returns:
	   If the blit is successful, it returns 0, otherwise it returns -1.
	   If either of	the surfaces were in video memory, and the blit
	   returns -2, the video memory	was lost. It should be reloaded	with
	   artwork and re-blitted.

       Parameters:

       src    the surface to blit from.

   bool	SDLmm::BaseSurface::Fill (Uint8	r, Uint8 g, Uint8 b, Uint8 a) [inline]
       Fast fill the surface with the specified	color.

       If a clipping rectangle has been	set using SetClipRect(), only the area
       within that rectangle will be filled.

       Returns:
	   Returns true	for success, false if there was	an error.

       Parameters:

       r, g, b
	      the red, green and blue color values.

       a      the alpha	value

   bool	SDLmm::BaseSurface::Fill (Uint8	r, Uint8 g, Uint8 b) [inline]
       Fast fill the surface with the specified	color.

       If a clipping rectangle has been	set using SetClipRect(), only the area
       within that rectangle will be filled.

       Returns:
	   Returns true	for success, false if there was	an error.

       Parameters:

       r, g, b
	      the red, green and blue color values.

   bool	SDLmm::BaseSurface::Fill (Color	color)
       Fast fill the surface with the specified	color.

       If a clipping rectangle has been	set using SetClipRect(), only the area
       within that rectangle will be filled.

       Returns:
	   Returns true	for success, false if there was	an error.

       Parameters:

       color  the color	to fill	with, generated	by MapRGB() or MapRGBA().

   bool	SDLmm::BaseSurface::FillRect (SDL_Rect & dstrect, Uint8	r, Uint8 g,
       Uint8 b,	Uint8 a) [inline]
       Performs	a fast fill of the given rectangle with	the specified color.

       If a clipping rectangle has been	set using SetClipRect(), the area
       filled will be the intersection of the clipping rectangle and dstrect.

       Returns:
	   Returns true	for success, false if there was	an error.

       Parameters:

       dstrect
	      the rectangle to fill, upon returning it contains	the  clipped
	      rectangle	that was actually filled.

       r, g, b
	      the red, green and blue color values.

       a      the alpha	value

   bool	SDLmm::BaseSurface::FillRect (SDL_Rect & dstrect, Uint8	r, Uint8 g,
       Uint8 b)	[inline]
       Performs	a fast fill of the given rectangle with	the specified color.

       If a clipping rectangle has been	set using SetClipRect(), the area
       filled will be the intersection of the clipping rectangle and dstrect.

       Returns:
	   Returns true	for success, false if there was	an error.

       Parameters:

       dstrect
	      the rectangle to fill, upon returning it contains	the  clipped
	      rectangle	that was actually filled.

       r, g, b
	      the red, green and blue color values.

   bool	SDLmm::BaseSurface::FillRect (SDL_Rect & dstrect, Color	color)
       Performs	a fast fill of the given rectangle with	the specified color.

       If a clipping rectangle has been	set using SetClipRect(), the area
       filled will be the intersection of the clipping rectangle and dstrect.

       Returns:
	   Returns true	for success, false if there was	an error.

       Parameters:

       dstrect
	      the rectangle to fill, upon returning it contains	the  clipped
	      rectangle	that was actually filled.

       color  the color	to fill	with, generated	by MapRGB() or MapRGBA().

   void	SDLmm::BaseSurface::GetClipRect	(SDL_Rect & rect) const
       Gets the	clipping rectangle for the surface.

       Gets the	clipping rectangle for a surface. When this surface is the
       destination of a	blit, only the area within the clip rectangle is drawn
       into.

       Parameters:

       rect   reference	to a rectangle which will be filled with the clipping
	      rectangle	of this	surface.

       See also:
	   SetClipRect,	ResetClipRect, Blit

   Color SDLmm::BaseSurface::GetPixel (const SRect & point) const [inline]
       Get the color of	the pixel.

       Warning:
	   You can only	use this function when the surface is locked.

   Color SDLmm::BaseSurface::GetPixel (int x, int y) const
       Get the color of	the pixel.

       Warning:
	   You can only	use this function when the surface is locked.

   PixelFormat SDLmm::BaseSurface::GetPixelFormat () [inline]
   const PixelFormat SDLmm::BaseSurface::GetPixelFormat	() const [inline]
       Returns the pixel format.

   const SDL_Surface * SDLmm::BaseSurface::GetSurface () const [inline]
   SDL_Surface * SDLmm::BaseSurface::GetSurface	() [inline]
   bool	SDLmm::BaseSurface::Lock ()
       Lock the	surface	to allow direct	access to the surface pixels. Returns
       true if lock succeeded, false otherwise.

   void	SDLmm::BaseSurface::ResetClipRect ()
       Resets the clipping rectangle for the surface.

       This functions resets the clipping to the full size of the surface.

       See also:
	   GetClipRect,	SetClipRect, Blit

   bool	SDLmm::BaseSurface::SaveBMP (const std::string & file) const [inline]
       Save a BaseSurface object as a Windows bitmap file.

       Parameters:

       file   the file name to save to.

       Returns:
	   True	if the loading succeeded, false	otherwise.

   bool	SDLmm::BaseSurface::SaveBMP (const char	* file)	const
       Save a BaseSurface object as a Windows bitmap file.

       Parameters:

       file   the file name to save to.

       Returns:
	   True	if the loading succeeded, false	otherwise.

   bool	SDLmm::BaseSurface::SetAlpha (Uint32 flag, Uint8 alpha)
       Adjust the alpha	properties of this surface.

       SetAlpha	is used	for setting the	surface	alpha value and	/ or enabling
       and disabling alpha blending.

       Parameters:

       flag   used to specify whether alpha blending should be used
	      (SDL_SRCALPHA) and whether the surface should use	RLE
	      acceleration for blitting	(SDL_RLEACCEL).	flag can be an OR'd
	      combination of these two options,	one of these options or	0. If
	      SDL_SRCALPHA is not passed as a flag then	all alpha information
	      is ignored when blitting the surface.

       alpha  the per-surface alpha value; a surface need not have an alpha
	      channel to use per-surface alpha and blitting can	still be
	      accelerated with SDL_RLEACCEL.

       Note:
	   The per-surface alpha value of 128 is considered a special case and
	   is optimised, so it's much faster than other	per-surface values.

       Returns:
	   true	for success or false if	there was an error.

   void	SDLmm::BaseSurface::SetClipRect	(const SDL_Rect	& rect)
       Sets the	clipping rectangle for the surface.

       Sets the	clipping rectangle for a surface. When this surface is the
       destination of a	blit, only the area within the clip rectangle will be
       drawn into.

       Parameters:

       rect   The rectangle pointed to by rect will be clipped to the edges of
	      the surface so that the clip rectangle for a surface can never
	      fall outside the edges of	the surface.

       See also:
	   GetClipRect,	ResetClipRect, Blit

   bool	SDLmm::BaseSurface::SetColorKey	(Uint32	flag, Color key)
       Sets the	color key (transparent pixel) in a blittable surface and
       enables or disables RLE blit acceleration.

       RLE acceleration	can substantially speed	up blitting of images with
       large horizontal	runs of	transparent pixels (i.e., pixels that match
       the key value). The key must be of the same pixel format	as the
       surface,	MapRGB() is often useful for obtaining an acceptable value.

       Returns:
	   Returns true	for success, false if there was	an error.

       Parameters:

       flag   If

   bool	SDLmm::BaseSurface::SetDisplayFormat ()	[pure virtual]
       Convert the surface to the display format.

       This function converts the surface to the pixel format and colors of
       the video framebuffer, making it	suitable for fast blitting onto	the
       display surface.

       If you want to take advantage of	hardware colorkey or alpha blit
       acceleration, you should	set the	colorkey and alpha value before
       calling this function.

       Returns:
	   The functions returns true if the conversion	succeeded or false
	   otherwise. If the conversion	failed,	the BaseSurface	object will
	   not have changed.

       Note:
	   Please note that this function doesn't return a new,	modified
	   object like the SDL_DisplayFormat() function	does. Thus there is no
	   need	to manually free the old surface.

       See also:
	   SetDisplayFormatAlpha(), SetAlpha(),	SetColorKey()

       Reimplemented in	SDLmm::Display,	and SDLmm::Surface.

   bool	SDLmm::BaseSurface::SetDisplayFormatAlpha () [pure virtual]
       Convert the surface to the display format.

       This function converts the surface to the pixel format and colors of
       the video framebuffer plus an alpha channel, making it suitable for
       fast blitting onto the display surface.

       If you want to take advantage of	hardware colorkey or alpha blit
       acceleration, you should	set the	colorkey and alpha value before
       calling this function.

       Returns:
	   The functions returns true if the conversion	succeeded or false
	   otherwise. If the conversion	failed,	the BaseSurface	object will
	   not have changed.

       Note:
	   Please note that this function doesn't return a new,	modified
	   object like the SDL_DisplayFormatAlpha() function does. Thus	there
	   is no need to manually free the old surface.

       See also:
	   SetDisplayFormat(), SetAlpha(), SetColorKey()

       Reimplemented in	SDLmm::Display,	and SDLmm::Surface.

   void	SDLmm::BaseSurface::SetPixel (const SRect & point, Color color)
       [inline]
       Set the pixel to	the color.

       Warning:
	   You can only	use this function when the surface is locked.

   void	SDLmm::BaseSurface::SetPixel (int x, int y, Color color)
       Set the pixel to	the color.

       Warning:
	   You can only	use this function when the surface is locked.

   void	SDLmm::BaseSurface::SetPixel1 (int x, int y, Color color)
       Set the pixel to	the color.

       Warning:
	   You can only	use this function when the surface is locked and when
	   the bytes per pixel is 1.

   void	SDLmm::BaseSurface::SetPixel2 (int x, int y, Color color)
       Set the pixel to	the color.

       Warning:
	   You can only	use this function when the surface is locked and when
	   the bytes per pixel is 2.

   void	SDLmm::BaseSurface::SetPixel3 (int x, int y, Color color)
       Set the pixel to	the color.

       Warning:
	   You can only	use this function when the surface is locked and when
	   the bytes per pixel is 3.

   void	SDLmm::BaseSurface::SetPixel4 (int x, int y, Color color)
       Set the pixel to	the color.

       Warning:
	   You can only	use this function when the surface is locked and when
	   the bytes per pixel is 4.

   void	SDLmm::BaseSurface::SetSurface (SDL_Surface * surface) [inline,
       protected, virtual]
   void	SDLmm::BaseSurface::Unlock ()
       Unlock the surface.

   const SRect SDLmm::BaseSurface::clip_rect ()	const [inline]
       Returns the surface clip	rectangle.

   Uint32 SDLmm::BaseSurface::flags () const [inline]
       Returns the surface flags.

   int SDLmm::BaseSurface::h ()	const [inline]
       Returns the height of the surface.

   struct private_hwdata * SDLmm::BaseSurface::hwdata () const [inline]
       Returns the hardware-specific surface info.

   BaseSurface & SDLmm::BaseSurface::operator= (const BaseSurface & other)
       [inline,	protected]
   Uint16 SDLmm::BaseSurface::pitch () const [inline]
       Returns the scanline length in bytes.

   const void *	SDLmm::BaseSurface::pixels () const [inline]
       Returns the pixel data, which can be used for low-level manipulation.

       Warning:
	   You can only	modify this surface when the surface is	locked.

   void	* SDLmm::BaseSurface::pixels ()	[inline]
       Returns the pixel data, which can be used for low-level manipulation.

       Warning:
	   You can only	modify this surface when the surface is	locked.

   bool	SDLmm::BaseSurface::valid () const [inline]
       Returns true if this surface is initialized, false otherwise.

       Warning:
	   Using an uninitialzied surface can cause many problems.

   int SDLmm::BaseSurface::w ()	const [inline]
       Returns the width of the	surface.

MEMBER DATA DOCUMENTATION
   SDL_Surface * SDLmm::BaseSurface::me	[protected]
       The actual SDL_Surface allocated	for this BaseSurface.

AUTHOR
       Generated automatically by Doxygen for SDLmm from the source code.

SDLmm				  16 Jul 2001		 SDLmm::BaseSurface(3)

NAME | SYNOPSIS | DETAILED DESCRIPTION | CONSTRUCTOR & DESTRUCTOR DOCUMENTATION | MEMBER FUNCTION DOCUMENTATION | MEMBER DATA DOCUMENTATION | AUTHOR

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