/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

/** @file SDL_video.h

 *  Header file for access to the SDL raw framebuffer window

 */

#ifndef _SDL_video_h

#define _SDL_video_h

#include "SDL_stdinc.h"

#include "SDL_error.h"

#include "SDL_rwops.h"

#include "begin_code.h"

/* Set up for C function definitions, even when using C++ */

#ifdef __cplusplus

extern "C" {

#endif

/** @name Transparency definitions

 *  These define alpha as the opacity of a surface

 */

/*@{*/

#define SDL_ALPHA_OPAQUE 255

#define SDL_ALPHA_TRANSPARENT 0

/*@}*/

/** @name Useful data types */

/*@{*/

typedef struct SDL_Rect {

	Sint16 x, y;

	Uint16 w, h;

} SDL_Rect;

typedef struct SDL_Color {

	Uint8 r;

	Uint8 g;

	Uint8 b;

	Uint8 unused;

} SDL_Color;

#define SDL_Colour SDL_Color

typedef struct SDL_Palette {

	int       ncolors;

	SDL_Color *colors;

} SDL_Palette;

/*@}*/

/** Everything in the pixel format structure is read-only */

typedef struct SDL_PixelFormat {

	SDL_Palette *palette;

	Uint8  BitsPerPixel;

	Uint8  BytesPerPixel;

	Uint8  Rloss;

	Uint8  Gloss;

	Uint8  Bloss;

	Uint8  Aloss;

	Uint8  Rshift;

	Uint8  Gshift;

	Uint8  Bshift;

	Uint8  Ashift;

	Uint32 Rmask;

	Uint32 Gmask;

	Uint32 Bmask;

	Uint32 Amask;

	/** RGB color key information */

	Uint32 colorkey;

	/** Alpha value information (per-surface alpha) */

	Uint8  alpha;

} SDL_PixelFormat;

/** This structure should be treated as read-only, except for 'pixels',

 *  which, if not NULL, contains the raw pixel data for the surface.

 */

typedef struct SDL_Surface {

	Uint32 flags;				/**< Read-only */

	SDL_PixelFormat *format;		/**< Read-only */

	int w, h;				/**< Read-only */

	Uint16 pitch;				/**< Read-only */

	void *pixels;				/**< Read-write */

	int offset;				/**< Private */

	/** Hardware-specific surface info */

	struct private_hwdata *hwdata;

	/** clipping information */

	SDL_Rect clip_rect;			/**< Read-only */

	Uint32 unused1;				/**< for binary compatibility */

	/** Allow recursive locks */

	Uint32 locked;				/**< Private */

	/** info for fast blit mapping to other surfaces */

	struct SDL_BlitMap *map;		/**< Private */

	/** format version, bumped at every change to invalidate blit maps */

	unsigned int format_version;		/**< Private */

	/** Reference count -- used when freeing surface */

	int refcount;				/**< Read-mostly */

} SDL_Surface;

/** @name SDL_Surface Flags

 *  These are the currently supported flags for the SDL_surface

 */

/*@{*/

/** Available for SDL_CreateRGBSurface() or SDL_SetVideoMode() */

/*@{*/

#define SDL_SWSURFACE	0x00000000	/**< Surface is in system memory */

#define SDL_HWSURFACE	0x00000001	/**< Surface is in video memory */

#define SDL_ASYNCBLIT	0x00000004	/**< Use asynchronous blits if possible */

/*@}*/

/** Available for SDL_SetVideoMode() */

/*@{*/

#define SDL_ANYFORMAT	0x10000000	/**< Allow any video depth/pixel-format */

#define SDL_HWPALETTE	0x20000000	/**< Surface has exclusive palette */

#define SDL_DOUBLEBUF	0x40000000	/**< Set up double-buffered video mode */

#define SDL_FULLSCREEN	0x80000000	/**< Surface is a full screen display */

#define SDL_OPENGL      0x00000002      /**< Create an OpenGL rendering context */

#define SDL_OPENGLBLIT	0x0000000A	/**< Create an OpenGL rendering context and use it for blitting */

#define SDL_RESIZABLE	0x00000010	/**< This video mode may be resized */

#define SDL_NOFRAME	0x00000020	/**< No window caption or edge frame */

/*@}*/

/** Used internally (read-only) */

/*@{*/

#define SDL_HWACCEL	0x00000100	/**< Blit uses hardware acceleration */

#define SDL_SRCCOLORKEY	0x00001000	/**< Blit uses a source color key */

#define SDL_RLEACCELOK	0x00002000	/**< Private flag */

#define SDL_RLEACCEL	0x00004000	/**< Surface is RLE encoded */

#define SDL_SRCALPHA	0x00010000	/**< Blit uses source alpha blending */

#define SDL_PREALLOC	0x01000000	/**< Surface uses preallocated memory */

/*@}*/

/*@}*/

/** Evaluates to true if the surface needs to be locked before access */

#define SDL_MUSTLOCK(surface)	\

  (surface->offset ||		\

  ((surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_RLEACCEL)) != 0))

/** typedef for private surface blitting functions */

typedef int (*SDL_blit)(struct SDL_Surface *src, SDL_Rect *srcrect,

			struct SDL_Surface *dst, SDL_Rect *dstrect);

/** Useful for determining the video hardware capabilities */

typedef struct SDL_VideoInfo {

	Uint32 hw_available :1;	/**< Flag: Can you create hardware surfaces? */

	Uint32 wm_available :1;	/**< Flag: Can you talk to a window manager? */

	Uint32 UnusedBits1  :6;

	Uint32 UnusedBits2  :1;

	Uint32 blit_hw      :1;	/**< Flag: Accelerated blits HW --> HW */

	Uint32 blit_hw_CC   :1;	/**< Flag: Accelerated blits with Colorkey */

	Uint32 blit_hw_A    :1;	/**< Flag: Accelerated blits with Alpha */

	Uint32 blit_sw      :1;	/**< Flag: Accelerated blits SW --> HW */

	Uint32 blit_sw_CC   :1;	/**< Flag: Accelerated blits with Colorkey */

	Uint32 blit_sw_A    :1;	/**< Flag: Accelerated blits with Alpha */

	Uint32 blit_fill    :1;	/**< Flag: Accelerated color fill */

	Uint32 UnusedBits3  :16;

	Uint32 video_mem;	/**< The total amount of video memory (in K) */

	SDL_PixelFormat *vfmt;	/**< Value: The format of the video surface */

	int    current_w;	/**< Value: The current video mode width */

	int    current_h;	/**< Value: The current video mode height */

} SDL_VideoInfo;

/** @name Overlay Formats

 *  The most common video overlay formats.

 *  For an explanation of these pixel formats, see:

 *	http://www.webartz.com/fourcc/indexyuv.htm

 *

 *  For information on the relationship between color spaces, see:

 *  http://www.neuro.sfc.keio.ac.jp/~aly/polygon/info/color-space-faq.html

 */

/*@{*/

#define SDL_YV12_OVERLAY  0x32315659	/**< Planar mode: Y + V + U  (3 planes) */

#define SDL_IYUV_OVERLAY  0x56555949	/**< Planar mode: Y + U + V  (3 planes) */

#define SDL_YUY2_OVERLAY  0x32595559	/**< Packed mode: Y0+U0+Y1+V0 (1 plane) */

#define SDL_UYVY_OVERLAY  0x59565955	/**< Packed mode: U0+Y0+V0+Y1 (1 plane) */

#define SDL_YVYU_OVERLAY  0x55595659	/**< Packed mode: Y0+V0+Y1+U0 (1 plane) */

/*@}*/

/** The YUV hardware video overlay */

typedef struct SDL_Overlay {

	Uint32 format;				/**< Read-only */

	int w, h;				/**< Read-only */

	int planes;				/**< Read-only */

	Uint16 *pitches;			/**< Read-only */

	Uint8 **pixels;				/**< Read-write */

	/** @name Hardware-specific surface info */

        /*@{*/

	struct private_yuvhwfuncs *hwfuncs;

	struct private_yuvhwdata *hwdata;

        /*@{*/

	/** @name Special flags */

        /*@{*/

	Uint32 hw_overlay :1;	/**< Flag: This overlay hardware accelerated? */

	Uint32 UnusedBits :31;

        /*@}*/

} SDL_Overlay;

/** Public enumeration for setting the OpenGL window attributes. */

typedef enum {

    SDL_GL_RED_SIZE,

    SDL_GL_GREEN_SIZE,

    SDL_GL_BLUE_SIZE,

    SDL_GL_ALPHA_SIZE,

    SDL_GL_BUFFER_SIZE,

    SDL_GL_DOUBLEBUFFER,

    SDL_GL_DEPTH_SIZE,

    SDL_GL_STENCIL_SIZE,

    SDL_GL_ACCUM_RED_SIZE,

    SDL_GL_ACCUM_GREEN_SIZE,

    SDL_GL_ACCUM_BLUE_SIZE,

    SDL_GL_ACCUM_ALPHA_SIZE,

    SDL_GL_STEREO,

    SDL_GL_MULTISAMPLEBUFFERS,

    SDL_GL_MULTISAMPLESAMPLES,

    SDL_GL_ACCELERATED_VISUAL,

    SDL_GL_SWAP_CONTROL

} SDL_GLattr;

/** @name flags for SDL_SetPalette() */

/*@{*/

#define SDL_LOGPAL 0x01

#define SDL_PHYSPAL 0x02

/*@}*/

/* Function prototypes */

/**

 * @name Video Init and Quit

 * These functions are used internally, and should not be used unless you

 * have a specific need to specify the video driver you want to use.

 * You should normally use SDL_Init() or SDL_InitSubSystem().

 */

/*@{*/

/**

 * Initializes the video subsystem. Sets up a connection

 * to the window manager, etc, and determines the current video mode and

 * pixel format, but does not initialize a window or graphics mode.

 * Note that event handling is activated by this routine.

 *

 * If you use both sound and video in your application, you need to call

 * SDL_Init() before opening the sound device, otherwise under Win32 DirectX,

 * you won't be able to set full-screen display modes.

 */

extern DECLSPEC int SDLCALL SDL_VideoInit(const char *driver_name, Uint32 flags);

extern DECLSPEC void SDLCALL SDL_VideoQuit(void);

/*@}*/

/**

 * This function fills the given character buffer with the name of the

 * video driver, and returns a pointer to it if the video driver has

 * been initialized.  It returns NULL if no driver has been initialized.

 */

extern DECLSPEC char * SDLCALL SDL_VideoDriverName(char *namebuf, int maxlen);

/**

 * This function returns a pointer to the current display surface.

 * If SDL is doing format conversion on the display surface, this

 * function returns the publicly visible surface, not the real video

 * surface.

 */

extern DECLSPEC SDL_Surface * SDLCALL SDL_GetVideoSurface(void);

/**

 * This function returns a read-only pointer to information about the

 * video hardware.  If this is called before SDL_SetVideoMode(), the 'vfmt'

 * member of the returned structure will contain the pixel format of the

 * "best" video mode.

 */

extern DECLSPEC const SDL_VideoInfo * SDLCALL SDL_GetVideoInfo(void);

/**

 * Check to see if a particular video mode is supported.

 * It returns 0 if the requested mode is not supported under any bit depth,

 * or returns the bits-per-pixel of the closest available mode with the

 * given width and height.  If this bits-per-pixel is different from the

 * one used when setting the video mode, SDL_SetVideoMode() will succeed,

 * but will emulate the requested bits-per-pixel with a shadow surface.

 *

 * The arguments to SDL_VideoModeOK() are the same ones you would pass to

 * SDL_SetVideoMode()

 */

extern DECLSPEC int SDLCALL SDL_VideoModeOK(int width, int height, int bpp, Uint32 flags);

/**

 * Return a pointer to an array of available screen dimensions for the

 * given format and video flags, sorted largest to smallest.  Returns 

 * NULL if there are no dimensions available for a particular format, 

 * or (SDL_Rect **)-1 if any dimension is okay for the given format.

 *

 * If 'format' is NULL, the mode list will be for the format given 

 * by SDL_GetVideoInfo()->vfmt

 */

extern DECLSPEC SDL_Rect ** SDLCALL SDL_ListModes(SDL_PixelFormat *format, Uint32 flags);

/**

 * Set up a video mode with the specified width, height and bits-per-pixel.

 *

 * If 'bpp' is 0, it is treated as the current display bits per pixel.

 *

 * If SDL_ANYFORMAT is set in 'flags', the SDL library will try to set the

 * requested bits-per-pixel, but will return whatever video pixel format is

 * available.  The default is to emulate the requested pixel format if it

 * is not natively available.

 *

 * If SDL_HWSURFACE is set in 'flags', the video surface will be placed in

 * video memory, if possible, and you may have to call SDL_LockSurface()

 * in order to access the raw framebuffer.  Otherwise, the video surface

 * will be created in system memory.

 *

 * If SDL_ASYNCBLIT is set in 'flags', SDL will try to perform rectangle

 * updates asynchronously, but you must always lock before accessing pixels.

 * SDL will wait for updates to complete before returning from the lock.

 *

 * If SDL_HWPALETTE is set in 'flags', the SDL library will guarantee

 * that the colors set by SDL_SetColors() will be the colors you get.

 * Otherwise, in 8-bit mode, SDL_SetColors() may not be able to set all

 * of the colors exactly the way they are requested, and you should look

 * at the video surface structure to determine the actual palette.

 * If SDL cannot guarantee that the colors you request can be set, 

 * i.e. if the colormap is shared, then the video surface may be created

 * under emulation in system memory, overriding the SDL_HWSURFACE flag.

 *

 * If SDL_FULLSCREEN is set in 'flags', the SDL library will try to set

 * a fullscreen video mode.  The default is to create a windowed mode

 * if the current graphics system has a window manager.

 * If the SDL library is able to set a fullscreen video mode, this flag 

 * will be set in the surface that is returned.

 *

 * If SDL_DOUBLEBUF is set in 'flags', the SDL library will try to set up

 * two surfaces in video memory and swap between them when you call 

 * SDL_Flip().  This is usually slower than the normal single-buffering

 * scheme, but prevents "tearing" artifacts caused by modifying video 

 * memory while the monitor is refreshing.  It should only be used by 

 * applications that redraw the entire screen on every update.

 *

 * If SDL_RESIZABLE is set in 'flags', the SDL library will allow the

 * window manager, if any, to resize the window at runtime.  When this

 * occurs, SDL will send a SDL_VIDEORESIZE event to you application,

 * and you must respond to the event by re-calling SDL_SetVideoMode()

 * with the requested size (or another size that suits the application).

 *

 * If SDL_NOFRAME is set in 'flags', the SDL library will create a window

 * without any title bar or frame decoration.  Fullscreen video modes have

 * this flag set automatically.

 *

 * This function returns the video framebuffer surface, or NULL if it fails.

 *

 * If you rely on functionality provided by certain video flags, check the

 * flags of the returned surface to make sure that functionality is available.

 * SDL will fall back to reduced functionality if the exact flags you wanted

 * are not available.

 */

extern DECLSPEC SDL_Surface * SDLCALL SDL_SetVideoMode

			(int width, int height, int bpp, Uint32 flags);

/** @name SDL_Update Functions

 * These functions should not be called while 'screen' is locked.

 */

/*@{*/

/**

 * Makes sure the given list of rectangles is updated on the given screen.

 */

extern DECLSPEC void SDLCALL SDL_UpdateRects

		(SDL_Surface *screen, int numrects, SDL_Rect *rects);

/**

 * If 'x', 'y', 'w' and 'h' are all 0, SDL_UpdateRect will update the entire

 * screen.

 */

extern DECLSPEC void SDLCALL SDL_UpdateRect

		(SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h);

/*@}*/

/**

 * On hardware that supports double-buffering, this function sets up a flip

 * and returns.  The hardware will wait for vertical retrace, and then swap

 * video buffers before the next video surface blit or lock will return.

 * On hardware that doesn not support double-buffering, this is equivalent

 * to calling SDL_UpdateRect(screen, 0, 0, 0, 0);

 * The SDL_DOUBLEBUF flag must have been passed to SDL_SetVideoMode() when

 * setting the video mode for this function to perform hardware flipping.

 * This function returns 0 if successful, or -1 if there was an error.

 */

extern DECLSPEC int SDLCALL SDL_Flip(SDL_Surface *screen);

/**

 * Set the gamma correction for each of the color channels.

 * The gamma values range (approximately) between 0.1 and 10.0

 * 

 * If this function isn't supported directly by the hardware, it will

 * be emulated using gamma ramps, if available.  If successful, this

 * function returns 0, otherwise it returns -1.

 */

extern DECLSPEC int SDLCALL SDL_SetGamma(float red, float green, float blue);

/**

 * Set the gamma translation table for the red, green, and blue channels

 * of the video hardware.  Each table is an array of 256 16-bit quantities,

 * representing a mapping between the input and output for that channel.

 * The input is the index into the array, and the output is the 16-bit

 * gamma value at that index, scaled to the output color precision.

 * 

 * You may pass NULL for any of the channels to leave it unchanged.

 * If the call succeeds, it will return 0.  If the display driver or

 * hardware does not support gamma translation, or otherwise fails,

 * this function will return -1.

 */

extern DECLSPEC int SDLCALL SDL_SetGammaRamp(const Uint16 *red, const Uint16 *green, const Uint16 *blue);

/**

 * Retrieve the current values of the gamma translation tables.

 * 

 * You must pass in valid pointers to arrays of 256 16-bit quantities.

 * Any of the pointers may be NULL to ignore that channel.

 * If the call succeeds, it will return 0.  If the display driver or

 * hardware does not support gamma translation, or otherwise fails,

 * this function will return -1.

 */

extern DECLSPEC int SDLCALL SDL_GetGammaRamp(Uint16 *red, Uint16 *green, Uint16 *blue);

/**

 * Sets a portion of the colormap for the given 8-bit surface.  If 'surface'

 * is not a palettized surface, this function does nothing, returning 0.

 * If all of the colors were set as passed to SDL_SetColors(), it will

 * return 1.  If not all the color entries were set exactly as given,

 * it will return 0, and you should look at the surface palette to

 * determine the actual color palette.

 *

 * When 'surface' is the surface associated with the current display, the

 * display colormap will be updated with the requested colors.  If 

 * SDL_HWPALETTE was set in SDL_SetVideoMode() flags, SDL_SetColors()

 * will always return 1, and the palette is guaranteed to be set the way

 * you desire, even if the window colormap has to be warped or run under

 * emulation.

 */

extern DECLSPEC int SDLCALL SDL_SetColors(SDL_Surface *surface, 

			SDL_Color *colors, int firstcolor, int ncolors);

/**

 * Sets a portion of the colormap for a given 8-bit surface.

 * 'flags' is one or both of:

 * SDL_LOGPAL  -- set logical palette, which controls how blits are mapped

 *                to/from the surface,

 * SDL_PHYSPAL -- set physical palette, which controls how pixels look on

 *                the screen

 * Only screens have physical palettes. Separate change of physical/logical

 * palettes is only possible if the screen has SDL_HWPALETTE set.

 *

 * The return value is 1 if all colours could be set as requested, and 0

 * otherwise.

 *

 * SDL_SetColors() is equivalent to calling this function with

 *     flags = (SDL_LOGPAL|SDL_PHYSPAL).

 */

extern DECLSPEC int SDLCALL SDL_SetPalette(SDL_Surface *surface, int flags,

				   SDL_Color *colors, int firstcolor,

				   int ncolors);

/**

 * Maps an RGB triple to an opaque pixel value for a given pixel format

 */

extern DECLSPEC Uint32 SDLCALL SDL_MapRGB

(const SDL_PixelFormat * const format,

 const Uint8 r, const Uint8 g, const Uint8 b);

/**

 * Maps an RGBA quadruple to a pixel value for a given pixel format

 */

extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA

(const SDL_PixelFormat * const format,

 const Uint8 r, const Uint8 g, const Uint8 b, const Uint8 a);

/**

 * Maps a pixel value into the RGB components for a given pixel format

 */

extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel,

				const SDL_PixelFormat * const fmt,

				Uint8 *r, Uint8 *g, Uint8 *b);

/**

 * Maps a pixel value into the RGBA components for a given pixel format

 */

extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel,

				const SDL_PixelFormat * const fmt,

				Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);

/** @sa SDL_CreateRGBSurface */

#define SDL_AllocSurface    SDL_CreateRGBSurface

/**

 * Allocate and free an RGB surface (must be called after SDL_SetVideoMode)

 * If the depth is 4 or 8 bits, an empty palette is allocated for the surface.

 * If the depth is greater than 8 bits, the pixel format is set using the

 * flags '[RGB]mask'.

 * If the function runs out of memory, it will return NULL.

 *

 * The 'flags' tell what kind of surface to create.

 * SDL_SWSURFACE means that the surface should be created in system memory.

 * SDL_HWSURFACE means that the surface should be created in video memory,