include/SDL_video.h
author Sam Lantinga <slouken@libsdl.org>
Sun, 11 Jun 2006 07:30:16 +0000
branchSDL-1.3
changeset 1675 d33dcfc3fde7
parent 1670 eef792d31de8
child 1676 e136f3ffdc1b
permissions -rw-r--r--
Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 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_pixels.h"
#include "SDL_rwops.h"

#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#endif

/* Transparency definitions: These define alpha as the opacity of a surface */
#define SDL_ALPHA_OPAQUE 255
#define SDL_ALPHA_TRANSPARENT 0

/**
 * \struct SDL_Rect
 *
 * \brief A rectangle, with the origin at the upper left.
 */
typedef struct SDL_Rect
{
    Sint16 x, y;
    Uint16 w, h;
} SDL_Rect;

/**
 * \struct SDL_DisplayMode
 *
 * \brief  The structure that defines a display mode
 *
 * \sa SDL_GetNumDisplayModes()
 * \sa SDL_GetDisplayMode()
 * \sa SDL_GetDesktopDisplayMode()
 * \sa SDL_GetCurrentDisplayMode()
 * \sa SDL_GetClosestDisplayMode()
 * \sa SDL_SetDisplayMode()
 */
typedef struct
{
    Uint32 format;              /**< pixel format */
    int w;                      /**< width */
    int h;                      /**< height */
    int refresh_rate;           /**< refresh rate (or zero for unspecified) */
} SDL_DisplayMode;

/**
 * \typedef SDL_WindowID
 *
 * \brief The type used to identify a window
 *
 * \sa SDL_CreateWindow()
 * \sa SDL_CreateWindowFrom()
 * \sa SDL_DestroyWindow()
 * \sa SDL_GetWindowData()
 * \sa SDL_GetWindowFlags()
 * \sa SDL_GetWindowGrab()
 * \sa SDL_GetWindowPosition()
 * \sa SDL_GetWindowSize()
 * \sa SDL_GetWindowTitle()
 * \sa SDL_HideWindow()
 * \sa SDL_MaximizeWindow()
 * \sa SDL_MinimizeWindow()
 * \sa SDL_RaiseWindow()
 * \sa SDL_RestoreWindow()
 * \sa SDL_SetWindowData()
 * \sa SDL_SetWindowGrab()
 * \sa SDL_SetWindowIcon()
 * \sa SDL_SetWindowPosition()
 * \sa SDL_SetWindowSize()
 * \sa SDL_SetWindowTitle()
 * \sa SDL_ShowWindow()
 */
typedef Uint32 SDL_WindowID;

/**
 * \enum SDL_WindowFlags
 *
 * \brief The flags on a window
 *
 * \sa SDL_GetWindowFlags()
 */
typedef enum
{
    SDL_WINDOW_FULLSCREEN = 0x00000001,         /**< fullscreen window, implies borderless */
    SDL_WINDOW_BORDERLESS = 0x00000002,         /**< no window decoration */
    SDL_WINDOW_SHOWN = 0x00000004,              /**< window is visible */
    SDL_WINDOW_OPENGL = 0x00000008,             /**< window usable with OpenGL context */
    SDL_WINDOW_RESIZABLE = 0x00000010,          /**< window can be resized */
    SDL_WINDOW_MAXIMIZED = 0x00000020,          /**< maximized */
    SDL_WINDOW_MINIMIZED = 0x00000040,          /**< minimized */
    SDL_WINDOW_INPUT_GRABBED = 0x00000080,      /**< window has grabbed input focus */
    SDL_WINDOW_KEYBOARD_FOCUS = 0x00000100,     /**< window has keyboard focus */
    SDL_WINDOW_MOUSE_FOCUS = 0x00000200,        /**< window has mouse focus */
} SDL_WindowFlags;

/**
 * \enum SDL_WindowEventID
 *
 * \brief Event subtype for window events
 */
typedef enum
{
    SDL_WINDOWEVENT_NONE,               /**< Never used */
    SDL_WINDOWEVENT_SHOWN,              /**< Window has been shown */
    SDL_WINDOWEVENT_HIDDEN,             /**< Window has been hidden */
    SDL_WINDOWEVENT_MOVED,              /**< Window has been moved to data1,data2 */
    SDL_WINDOWEVENT_RESIZED,            /**< Window size changed to data1xdata2 */
    SDL_WINDOWEVENT_MINIMIZED,          /**< Window has been minimized */
    SDL_WINDOWEVENT_MAXIMIZED,          /**< Window has been maximized */
    SDL_WINDOWEVENT_RESTORED,           /**< Window has been restored to normal size and position */
    SDL_WINDOWEVENT_ENTER,              /**< The window has gained mouse focus */
    SDL_WINDOWEVENT_LEAVE,              /**< The window has lost mouse focus */
    SDL_WINDOWEVENT_FOCUS_GAINED,       /**< The window has gained keyboard focus */
    SDL_WINDOWEVENT_FOCUS_LOST,         /**< The window has lost keyboard focus */
} SDL_WindowEventID;

/**
 * \enum SDL_RendererFlags
 *
 * \brief Flags used when initializing a render manager.
 */
typedef enum
{
    SDL_Renderer_PresentDiscard = 0x00000001,   /**< Present leaves the contents of the backbuffer undefined */
    SDL_Renderer_PresentCopy = 0x00000002,      /**< Present uses a copy from back buffer to the front buffer */
    SDL_Renderer_PresentFlip2 = 0x00000004,     /**< Present uses a flip, swapping back buffer and front buffer */
    SDL_Renderer_PresentFlip3 = 0x00000008,     /**< Present uses a flip, rotating between two back buffers and a front buffer */
    SDL_Renderer_PresentVSync = 0x00000010,     /**< Present is synchronized with the refresh rate */
    SDL_Renderer_RenderTarget = 0x00000020,     /**< The renderer can create texture render targets */
    SDL_Renderer_Accelerated = 0x00000040,      /**< The renderer uses hardware acceleration */
    SDL_Renderer_Minimal = 0x00000080,          /**< The renderer only supports the read/write pixel and present functions */
} SDL_RendererFlags;

/**
 * \struct SDL_RendererInfo
 *
 * \brief Information on the capabilities of a render manager.
 */
typedef struct SDL_RendererInfo
{
    const char *name;           /**< The name of the renderer */
    Uint32 flags;               /**< Supported SDL_RendererFlags */
    Uint32 blend_modes;         /**< A mask of supported blend modes */
    Uint32 scale_modes;         /**< A mask of supported scale modes */
    Uint32 num_texture_formats; /**< The number of available texture formats */
    Uint32 texture_formats[32]; /**< The available texture formats */
    int max_texture_width;      /**< The maximimum texture width */
    int max_texture_height;     /**< The maximimum texture height */
} SDL_RendererInfo;

/**
 * \enum SDL_TextureAccess
 *
 * \brief The access pattern allowed for a texture
 */
typedef enum
{
    SDL_TextureAccess_Render,   /**< Unlockable video memory, rendering allowed */
    SDL_TextureAccess_Remote,   /**< Unlockable video memory */
    SDL_TextureAccess_Local,    /**< Lockable system memory */
} SDL_TextureAccess;

/**
 * \enum SDL_TextureBlendMode
 *
 * \brief The blend mode used in SDL_RenderCopy()
 */
typedef enum
{
    SDL_TextureBlendMode_None,  /**< No blending */
    SDL_TextureBlendMode_Mask,  /**< dst = A ? src : dst (alpha is mask) */
    SDL_TextureBlendMode_Blend, /**< dst = (src * A) + (dst * (1-A)) */
    SDL_TextureBlendMode_Add,   /**< dst = (src * A) + dst */
    SDL_TextureBlendMode_Mod,   /**< dst = src * dst */
} SDL_TextureBlendMode;

/**
 * \enum SDL_TextureScaleMode
 *
 * \brief The scale mode used in SDL_RenderCopy()
 */
typedef enum
{
    SDL_TextureScaleMode_None,  /**< No scaling, rectangles must match dimensions */
    SDL_TextureScaleMode_Fast,  /**< Point sampling or equivalent algorithm */
    SDL_TextureScaleMode_Slow,  /**< Linear filtering or equivalent algorithm */
    SDL_TextureScaleMode_Best,  /**< Bicubic filtering or equivalent algorithm */
} SDL_TextureScaleMode;

/**
 * \typedef SDL_TextureID
 *
 * \brief An efficient driver-specific representation of pixel data
 */
typedef Uint32 SDL_TextureID;


/* These are the currently supported flags for the SDL_surface */
/* Used internally (read-only) */
#define SDL_HWSURFACE       0x00000001  /* Surface represents a texture */
#define SDL_PREALLOC        0x00000002  /* Surface uses preallocated memory */
#define SDL_SRCALPHA        0x00000004  /* Blit uses source alpha blending */
#define SDL_SRCCOLORKEY     0x00000008  /* Blit uses a source color key */
#define SDL_RLEACCELOK      0x00000010  /* Private flag */
#define SDL_RLEACCEL        0x00000020  /* Surface is RLE encoded */

/* Evaluates to true if the surface needs to be locked before access */
#define SDL_MUSTLOCK(S)	(((S)->flags & (SDL_HWSURFACE|SDL_RLEACCEL)) != 0)

/* 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 */
    int pitch;                  /* Read-only */
    void *pixels;               /* Read-write */

    /* information needed for surfaces requiring locks */
    int locked;
    void *lock_data;

    /* clipping information */
    SDL_Rect clip_rect;         /* Read-only */

    /* 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;

/* typedef for private surface blitting functions */
typedef int (*SDL_blit) (struct SDL_Surface * src, SDL_Rect * srcrect,
                         struct SDL_Surface * dst, SDL_Rect * dstrect);


/**
 * \enum SDL_GLattr
 *
 * \brief OpenGL configuration 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;


/* Function prototypes */

/**
 * \fn int SDL_GetNumVideoDrivers(void)
 *
 * \brief Get the number of video drivers compiled into SDL
 *
 * \sa SDL_GetVideoDriver()
 */
extern DECLSPEC int SDLCALL SDL_GetNumVideoDrivers(void);

/**
 * \fn const char *SDL_GetVideoDriver(int index)
 *
 * \brief Get the name of a built in video driver.
 *
 * \note The video drivers are presented in the order in which they are
 * normally checked during initialization.
 *
 * \sa SDL_GetNumVideoDrivers()
 */
extern DECLSPEC const char *SDLCALL SDL_GetVideoDriver(int index);

/**
 * \fn int SDL_VideoInit(const char *driver_name, Uint32 flags)
 *
 * \brief Initialize the video subsystem, optionally specifying a video driver.
 *
 * \param driver_name Initialize a specific driver by name, or NULL for the default video driver.
 * \param flags FIXME: Still needed?
 *
 * \return 0 on success, -1 on error
 *
 * This function initializes the video subsystem; setting up a connection
 * to the window manager, etc, and determines the available display modes
 * and pixel formats, but does not initialize a window or graphics mode.
 *
 * \sa SDL_VideoQuit()
 */
extern DECLSPEC int SDLCALL SDL_VideoInit(const char *driver_name,
                                          Uint32 flags);

/**
 * \fn void SDL_VideoQuit(void)
 *
 * \brief Shuts down the video subsystem.
 *
 * This function closes all windows, and restores the original video mode.
 *
 * \sa SDL_VideoInit()
 */
extern DECLSPEC void SDLCALL SDL_VideoQuit(void);

/**
 * \fn const char *SDL_GetCurrentVideoDriver(void)
 *
 * \brief Returns the name of the currently initialized video driver.
 *
 * \return The name of the current video driver or NULL if no driver
 *         has been initialized
 *
 * \sa SDL_GetNumVideoDrivers()
 * \sa SDL_GetVideoDriver()
 */
extern DECLSPEC const char *SDLCALL SDL_GetCurrentVideoDriver(void);

/**
 * \fn int SDL_GetNumVideoDisplays(void)
 *
 * \brief Returns the number of available video displays.
 *
 * \sa SDL_SelectVideoDisplay()
 */
extern DECLSPEC int SDLCALL SDL_GetNumVideoDisplays(void);

/**
 * \fn int SDL_SelectVideoDisplay(int index)
 *
 * \brief Set the index of the currently selected display.
 *
 * \return The index of the currently selected display.
 *
 * \note You can query the currently selected display by passing an index of -1.
 *
 * \sa SDL_GetNumVideoDisplays()
 */
extern DECLSPEC int SDLCALL SDL_SelectVideoDisplay(int index);

/**
 * \fn int SDL_GetNumDisplayModes(void)
 *
 * \brief Returns the number of available display modes for the current display.
 *
 * \sa SDL_GetDisplayMode()
 */
extern DECLSPEC int SDLCALL SDL_GetNumDisplayModes(void);

/**
 * \fn const SDL_DisplayMode *SDL_GetDisplayMode(int index)
 *
 * \brief Retrieve information about a specific display mode.
 *
 * \note The display modes are sorted in this priority:
 *       \li bits per pixel -> more colors to fewer colors
 *       \li width -> largest to smallest
 *       \li height -> largest to smallest
 *       \li refresh rate -> highest to lowest
 *
 * \sa SDL_GetNumDisplayModes()
 */
extern DECLSPEC const SDL_DisplayMode *SDLCALL SDL_GetDisplayMode(int index);

/**
 * \fn const SDL_DisplayMode *SDL_GetDesktopDisplayMode(void)
 *
 * \brief Retrieve information about the desktop display mode for the current display.
 */
extern DECLSPEC const SDL_DisplayMode *SDLCALL
SDL_GetDesktopDisplayMode(void);

/**
 * \fn const SDL_DisplayMode *SDL_GetCurrentDisplayMode(void)
 *
 * \brief Retrieve information about the current display mode.
 */
extern DECLSPEC const SDL_DisplayMode *SDLCALL
SDL_GetCurrentDisplayMode(void);

/**
 * \fn SDL_DisplayMode *SDL_GetClosestDisplayMode(const SDL_DisplayMode *mode, SDL_DisplayMode *closest)
 *
 * \brief Get the closest match to the requested display mode.
 *
 * \param mode The desired display mode
 * \param closest A pointer to a display mode to be filled in with the closest match of the available display modes.
 *
 * \return The passed in value 'closest', or NULL if no matching video mode was available.
 *
 * The available display modes are scanned, and 'closest' is filled in with the closest mode matching the requested mode and returned.  The mode format and refresh_rate default to the desktop mode if they are 0.  The modes are scanned with size being first priority, format being second priority, and finally checking the refresh_rate.  If all the available modes are too small, then NULL is returned.
 *
 * \sa SDL_GetNumDisplayModes()
 * \sa SDL_GetDisplayMode()
 */
extern DECLSPEC SDL_DisplayMode *SDLCALL SDL_GetClosestDisplayMode(const
                                                                   SDL_DisplayMode
                                                                   * mode,
                                                                   SDL_DisplayMode
                                                                   * closest);

/**
 * \fn int SDL_SetDisplayMode(const SDL_DisplayMode *mode)
 *
 * \brief Set up the closest available mode on the current display.
 *
 * \param mode The desired display mode
 *
 * \return 0 on success, or -1 if setting the display mode failed.
 */
extern DECLSPEC int SDLCALL SDL_SetDisplayMode(const SDL_DisplayMode * mode);

/**
 * \fn int SDL_SetDisplayColormap(SDL_Color *colors, int firstcolor, int ncolors)
 *
 * \brief Set the colormap for indexed display modes.
 *
 * \return 0 on success, or -1 if not all the colors could be set.
 */
extern DECLSPEC int SDLCALL SDL_SetDisplayColors(SDL_Color * colors,
                                                 int firstcolor, int ncolors);

/**
 * \fn SDL_WindowID SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
 *
 * \brief Create a window with the specified position, dimensions, and flags.
 *
 * \param title The title of the window
 * \param x The x position of the window
 * \param y The y position of the window
 * \param w The width of the window
 * \param h The height of the window
 * \param flags The flags for the window
 *
 * \return The id of the window created, or zero if window creation failed.
 *
 * \note Setting the position to -1, -1, indicates any position is fine.
 *
 * \sa SDL_DestroyWindow()
 */
extern DECLSPEC SDL_WindowID SDLCALL SDL_CreateWindow(const char *title,
                                                      int x, int y, int w,
                                                      int h, Uint32 flags);

/**
 * \fn SDL_WindowID SDL_CreateWindowFrom(void *data)
 *
 * \brief Create an SDL window struct from an existing native window.
 *
 * \param data A pointer to driver-dependent window creation data
 *
 * \return The id of the window created, or zero if window creation failed.
 *
 * \warning This function is NOT SUPPORTED, use at your own risk!
 *
 * \sa SDL_DestroyWindow()
 */
extern DECLSPEC SDL_WindowID SDLCALL SDL_CreateWindowFrom(void *data);

/**
 * \fn Uint32 SDL_GetWindowFlags(SDL_WindowID windowID)
 *
 * \brief Get the window flags.
 */
extern DECLSPEC Uint32 SDLCALL SDL_GetWindowFlags(SDL_WindowID windowID);

/**
 * \fn void SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
 *
 * \brief Set the title of the window, in UTF-8 format.
 *
 * \sa SDL_GetWindowTitle()
 */
extern DECLSPEC void SDLCALL SDL_SetWindowTitle(SDL_WindowID windowID,
                                                const char *title);

/**
 * \fn const char *SDL_GetWindowTitle(SDL_WindowID windowID)
 *
 * \brief Get the title of the window, in UTF-8 format.
 *
 * \sa SDL_SetWindowTitle()
 */
extern DECLSPEC const char *SDLCALL SDL_GetWindowTitle(SDL_WindowID windowID);

/**
 * \fn void SDL_SetWindowIcon(SDL_Surface *icon)
 *
 * \brief Set the icon of the window.
 *
 * \param icon The icon for the window
 *
 * FIXME: The icon needs to be set before the window is first shown.  Should some icon representation be part of the window creation data?
 */
extern DECLSPEC void SDLCALL SDL_SetWindowIcon(SDL_Surface * icon);

/**
 * \fn void SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
 *
 * \brief Associate an arbitrary pointer with the window.
 *
 * \sa SDL_GetWindowData()
 */
extern DECLSPEC void SDLCALL SDL_SetWindowData(SDL_WindowID windowID,
                                               void *userdata);

/**
 * \fn void *SDL_GetWindowData(SDL_WindowID windowID)
 *
 * \brief Retrieve the data pointer associated with the window.
 *
 * \sa SDL_SetWindowData()
 */
extern DECLSPEC void *SDLCALL SDL_GetWindowData(SDL_WindowID windowID);

/**
 * \fn void SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
 *
 * \brief Set the position of the window.
 *
 * \sa SDL_GetWindowPosition()
 */
extern DECLSPEC void SDLCALL SDL_SetWindowPosition(SDL_WindowID windowID,
                                                   int x, int y);

/**
 * \fn void SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
 *
 * \brief Get the position of the window.
 *
 * \sa SDL_SetWindowPosition()
 */
extern DECLSPEC void SDLCALL SDL_GetWindowPosition(SDL_WindowID windowID,
                                                   int *x, int *y);

/**
 * \fn void SDL_SetWindowSize(SDL_WindowID windowID, int w, int w)
 *
 * \brief Set the size of the window's client area.
 *
 * \note You can't change the size of a fullscreen window, it automatically
 * matches the size of the display mode.
 *
 * \sa SDL_GetWindowSize()
 */
extern DECLSPEC void SDLCALL SDL_SetWindowSize(SDL_WindowID windowID, int w,
                                               int h);

/**
 * \fn void SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *w)
 *
 * \brief Get the size of the window's client area.
 *
 * \sa SDL_SetWindowSize()
 */
extern DECLSPEC void SDLCALL SDL_GetWindowSize(SDL_WindowID windowID, int *w,
                                               int *h);

/**
 * \fn void SDL_ShowWindow(SDL_WindowID windowID)
 *
 * \brief Show the window
 *
 * \sa SDL_HideWindow()
 */
extern DECLSPEC void SDLCALL SDL_ShowWindow(SDL_WindowID windowID);

/**
 * \fn void SDL_HideWindow(SDL_WindowID windowID)
 *
 * \brief Hide the window
 *
 * \sa SDL_ShowWindow()
 */
extern DECLSPEC void SDLCALL SDL_HideWindow(SDL_WindowID windowID);

/**
 * \fn void SDL_RaiseWindow(SDL_WindowID windowID)
 *
 * \brief Raise the window so it's above other windows.
 */
extern DECLSPEC void SDLCALL SDL_RaiseWindow(SDL_WindowID windowID);

/**
 * \fn void SDL_MaximizeWindow(SDL_WindowID windowID)
 *
 * \brief Make the window as large as possible.
 *
 * \sa SDL_RestoreWindow()
 */
extern DECLSPEC void SDLCALL SDL_MaximizeWindow(SDL_WindowID windowID);

/**
 * \fn void SDL_MinimizeWindow(SDL_WindowID windowID)
 *
 * \brief Minimize the window to an iconic representation.
 *
 * \sa SDL_RestoreWindow()
 */
extern DECLSPEC void SDLCALL SDL_MinimizeWindow(SDL_WindowID windowID);

/**
 * \fn void SDL_RestoreWindow(SDL_WindowID windowID)
 *
 * \brief Restore the size and position of a minimized or maximized window.
 *
 * \sa SDL_MaximizeWindow()
 * \sa SDL_MinimizeWindow()
 */
extern DECLSPEC void SDLCALL SDL_RestoreWindow(SDL_WindowID windowID);

/**
 * \fn void SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
 *
 * \brief Set the window's input grab mode.
 *
 * \param mode This is 1 to grab input, and 0 to release input.
 *
 * \sa SDL_GrabMode
 * \sa SDL_GetWindowGrab()
 */
extern DECLSPEC void SDLCALL SDL_SetWindowGrab(SDL_WindowID windowID,
                                               int mode);

/**
 * \fn int SDL_GetWindowGrab(SDL_WindowID windowID)
 *
 * \brief Get the window's input grab mode.
 *
 * \return This returns 1 if input is grabbed, and 0 otherwise.
 *
 * \sa SDL_GrabMode
 * \sa SDL_SetWindowGrab()
 */
extern DECLSPEC int SDLCALL SDL_GetWindowGrab(SDL_WindowID windowID);

/**
 * \fn void SDL_DestroyWindow(SDL_WindowID windowID)
 *
 * \brief Destroy a window.
 */
extern DECLSPEC void SDLCALL SDL_DestroyWindow(SDL_WindowID windowID);

/**
 * \fn int SDL_GetNumRenderers(void)
 *
 * \brief Get the number of render managers on the current display.
 *
 * A render manager is a set of code that handles rendering and texture
 * management on a particular display.  Normally there is only one, but
 * some drivers may have several available with different capabilities.
 *
 * \sa SDL_GetRendererInfo()
 * \sa SDL_CreateRenderer()
 */
extern DECLSPEC int SDLCALL SDL_GetNumRenderers(void);

/**
 * \fn SDL_RendererInfo *SDL_GetRendererInfo(int index)
 *
 * \brief Get information about a specific render manager on the current
 *        display.
 *
 * \sa SDL_CreateRenderer()
 */
extern DECLSPEC int SDLCALL SDL_GetRendererInfo(int index,
                                                SDL_RendererInfo * info);

/**
 * \fn int SDL_CreateRenderer(SDL_WindowID window, int index, Uint32 flags)
 *
 * \brief Create and make active a 2D rendering context for a window.
 *
 * \param windowID The window used for rendering.
 * \param index The index of the render manager to initialize, or -1 to initialize the first one supporting the requested flags.
 * \param flags SDL_RendererFlags
 *
 * \return 0 on success, -1 if the flags were not supported, or -2 if
 *         there isn't enough memory to support the requested flags
 *
 * \sa SDL_SelectRenderer()
 * \sa SDL_DestroyRenderer()
 */
extern DECLSPEC int SDLCALL SDL_CreateRenderer(SDL_WindowID windowID,
                                               int index, Uint32 flags);

/**
 * \fn int SDL_SelectRenderer(SDL_WindowID windowID)
 *
 * \brief Select the rendering context for a particular window.
 *
 * \return 0 on success, -1 if the selected window doesn't have a
 *         rendering context.
 */
extern DECLSPEC int SDLCALL SDL_SelectRenderer(SDL_WindowID windowID);

/**
 * \fn SDL_TextureID SDL_CreateTexture(Uint32 format, int access, int w, int h)
 *
 * \brief Create a texture
 *
 * \param format The format of the texture
 * \param access One of the enumerated values in SDL_TextureAccess
 * \param w The width of the texture in pixels
 * \param h The height of the texture in pixels
 *
 * \return The created texture is returned, or 0 if no render manager was active,  the format was unsupported, or the width or height were out of range.
 *
 * \sa SDL_QueryTexture()
 * \sa SDL_DestroyTexture()
 */
extern DECLSPEC SDL_TextureID SDLCALL SDL_CreateTexture(Uint32 format,
                                                        int access, int w,
                                                        int h);

/**
 * \fn SDL_TextureID SDL_CreateTextureFromSurface(Uint32 format, int access, SDL_Surface *surface)
 *
 * \brief Create a texture from an existing surface
 *
 * \param format The format of the texture, or 0 to pick an appropriate format
 * \param access One of the enumerated values in SDL_TextureAccess
 * \param surface The surface containing pixel data used to fill the texture
 *
 * \return The created texture is returned, or 0 if no render manager was active,  the format was unsupported, or the surface width or height were out of range.
 *
 * \note The surface is not modified or freed by this function.
 *
 * \sa SDL_QueryTexture()
 * \sa SDL_DestroyTexture()
 */
extern DECLSPEC SDL_TextureID SDLCALL SDL_CreateTextureFromSurface(Uint32
                                                                   format,
                                                                   int access,
                                                                   SDL_Surface
                                                                   * surface);

/**
 * \fn int SDL_QueryTexture(SDL_TextureID textureID, Uint32 *format, int *access, int *w, int *h)
 *
 * \brief Query the attributes of a texture
 *
 * \param texture A texture to be queried
 * \param format A pointer filled in with the raw format of the texture.  The actual format may differ, but pixel transfers will use this format.
 * \param access A pointer filled in with the actual access to the texture.
 * \param w A pointer filled in with the width of the texture in pixels
 * \param h A pointer filled in with the height of the texture in pixels
 *
 * \return 0 on success, or -1 if the texture is not valid
 */
extern DECLSPEC int SDLCALL SDL_QueryTexture(SDL_TextureID textureID,
                                             Uint32 * format, int *access,
                                             int *w, int *h);

/**
 * \fn int SDL_SetTexturePalette(SDL_TextureID textureID, SDL_Color * colors, int firstcolor, int ncolors)
 *
 * \brief Update an indexed texture with a color palette
 *
 * \param texture The texture to update
 * \param colors The array of RGB color data
 * \param firstcolor The first index to update
 * \param ncolors The number of palette entries to fill with the color data
 *
 * \return 0 on success, or -1 if the texture is not valid or not an indexed texture
 */
extern DECLSPEC int SDLCALL SDL_SetTexturePalette(SDL_TextureID textureID,
                                                  SDL_Color * colors,
                                                  int firstcolor,
                                                  int ncolors);

/**
 * \fn int SDL_UpdateTexture(SDL_TextureID textureID, SDL_Rect *rect, const void *pixels, int pitch)
 *
 * \brief Update the given texture rectangle with new pixel data.
 *
 * \param texture The texture to update
 * \param rect A pointer to the rectangle of pixels to update, or NULL to update the entire texture.
 * \param pixels The raw pixel data
 * \param pitch The number of bytes between rows of pixel data
 *
 * \return 0 on success, or -1 if the texture is not valid
 *
 * \note This is a very slow function for textures not created with SDL_TextureAccess_Local.
 */
extern DECLSPEC int SDLCALL SDL_UpdateTexture(SDL_TextureID textureID,
                                              SDL_Rect * rect,
                                              const void *pixels, int pitch);

/**
 * \fn void SDL_LockTexture(SDL_TextureID textureID, SDL_Rect *rect, int markDirty, void **pixels, int *pitch)
 *
 * \brief Lock a portion of the texture for pixel access.
 *
 * \param texture The texture to lock for access, which must have been created with SDL_TextureAccess_Local.
 * \param rect A pointer to the rectangle to lock for access. If the rect is NULL, the entire texture will be locked.
 * \param markDirty If this is nonzero, the locked area will be marked dirty when the texture is unlocked.
 * \param pixels This is filled in with a pointer to the locked pixels, appropriately offset by the locked area.
 * \param pitch This is filled in with the pitch of the locked pixels.
 *
 * \return 0 on success, or -1 if the texture is not valid or was created with SDL_TextureAccess_Remote
 *
 * \sa SDL_DirtyTexture()
 * \sa SDL_UnlockTexture()
 */
extern DECLSPEC int SDLCALL SDL_LockTexture(SDL_TextureID textureID,
                                            SDL_Rect * rect, int markDirty,
                                            void **pixels, int *pitch);

/**
 * \fn void SDL_UnlockTexture(SDL_TextureID textureID)
 *
 * \brief Unlock a texture, uploading the changes to video memory, if needed.
 *
 * \sa SDL_LockTexture()
 * \sa SDL_DirtyTexture()
 */
extern DECLSPEC void SDLCALL SDL_UnlockTexture(SDL_TextureID textureID);

/**
 * \fn void SDL_DirtyTexture(SDL_TextureID textureID, int numrects, SDL_Rect * rects)
 *
 * \brief Mark the specified rectangles of the texture as dirty.
 *
 * \note The texture must have been created with SDL_TextureAccess_Local.
 *
 * \sa SDL_LockTexture()
 * \sa SDL_UnlockTexture()
 */
extern DECLSPEC void SDLCALL SDL_DirtyTexture(SDL_TextureID textureID,
                                              int numrects, SDL_Rect * rects);

/**
 * \fn void SDL_SelectRenderTexture(SDL_TextureID textureID)
 *
 * \brief Select a texture as the rendering target, or 0 to reselect the current window.
 *
 * \note The texture must have been created with SDL_TextureAccess_Render.
 */
extern DECLSPEC void SDLCALL SDL_SelectRenderTexture(SDL_TextureID textureID);

/**
 * \fn void SDL_RenderFill(SDL_Rect *rect, Uint32 color)
 *
 * \brief Fill the current rendering target with the specified color.
 *
 * \param rect A pointer to the destination rectangle, or NULL for the entire rendering target.
 * \param color An ARGB color value.
 *
 * \return 0 on success, or -1 if there is no renderer current
 */
extern DECLSPEC int SDLCALL SDL_RenderFill(SDL_Rect * rect, Uint32 color);

/**
 * \fn int SDL_RenderCopy(SDL_TextureID textureID, SDL_Rect *srcrect, SDL_Rect *dstrect, Uint32 blendMode, Uint32 scaleMode)
 *
 * \brief Copy a portion of the texture to the current rendering target.
 *
 * \param texture The source texture.
 * \param srcrect A pointer to the source rectangle, or NULL for the entire texture.
 * \param dstrect A pointer to the destination rectangle, or NULL for the entire rendering target.
 * \param blendMode SDL_TextureBlendMode to be used if the source texture has an alpha channel.
 * \param scaleMode SDL_TextureScaleMode to be used if the source and destination rectangles don't have the same width and height.
 *
 * \return 0 on success, or -1 if there is no renderer current, or the driver doesn't support the requested operation.
 *
 * \note You can check the video driver info to see what operations are supported.
 */
extern DECLSPEC int SDLCALL SDL_RenderCopy(SDL_TextureID textureID,
                                           SDL_Rect * srcrect,
                                           SDL_Rect * dstrect, int blendMode,
                                           int scaleMode);

/**
 * \fn int SDL_RenderReadPixels(SDL_Rect *rect, void *pixels, int pitch)
 *
 * \brief Read pixels from the current rendering target.
 *
 * \param rect A pointer to the rectangle to read, or NULL for the entire render target
 * \param pixels A pointer to be filled in with the pixel data
 * \param pitch The pitch of the pixels parameter
 *
 * \return 0 on success, or -1 if pixel reading is not supported.
 *
 * \warning This is a very slow operation, and should not be used frequently.
 */
extern DECLSPEC int SDLCALL SDL_RenderReadPixels(SDL_Rect * rect,
                                                 void *pixels, int pitch);

/**
 * \fn int SDL_RenderWritePixels(SDL_Rect *rect, const void *pixels, int pitch)
 *
 * \brief Write pixels to the current rendering target.
 *
 * \param rect A pointer to the rectangle to write, or NULL for the entire render target
 * \param pixels A pointer to the pixel data to write
 * \param pitch The pitch of the pixels parameter
 *
 * \return 0 on success, or -1 if pixel writing is not supported.
 *
 * \warning This is a very slow operation, and should not be used frequently.
 */
extern DECLSPEC int SDLCALL SDL_RenderWritePixels(SDL_Rect * rect,
                                                  const void *pixels,
                                                  int pitch);

/**
 * \fn void SDL_RenderPresent(void)
 *
 * \brief Update the screen with rendering performed.
 */
extern DECLSPEC void SDLCALL SDL_RenderPresent(void);

/**
 * \fn void SDL_DestroyTexture(SDL_TextureID textureID);
 *
 * \brief Destroy the specified texture.
 *
 * \sa SDL_CreateTexture()
 * \sa SDL_CreateTextureFromSurface()
 */
extern DECLSPEC void SDLCALL SDL_DestroyTexture(SDL_TextureID textureID);

/**
 * \fn void SDL_DestroyRenderer(SDL_WindowID windowID);
 *
 * \brief Destroy the rendering context for a window and free associated
 *        textures.
 *
 * \sa SDL_CreateRenderer()
 */
extern DECLSPEC void SDLCALL SDL_DestroyRenderer(SDL_WindowID windowID);

/*
 * 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);

/*
 * Maps an RGB triple to an opaque pixel value for a given pixel format
 */
extern DECLSPEC Uint32 SDLCALL SDL_MapRGB
    (SDL_PixelFormat * format, Uint8 r, Uint8 g, Uint8 b);

/*
 * Maps an RGBA quadruple to a pixel value for a given pixel format
 */
extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(SDL_PixelFormat * format,
                                           Uint8 r, Uint8 g, Uint8 b,
                                           Uint8 a);

/*
 * Maps a pixel value into the RGB components for a given pixel format
 */
extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel, SDL_PixelFormat * 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, SDL_PixelFormat * fmt,
                                         Uint8 * r, Uint8 * g, Uint8 * b,
                                         Uint8 * a);

/*
 * 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_SRCCOLORKEY indicates that the surface will be used for colorkey blits.
 * SDL_SRCALPHA means that the surface will be used for alpha blits.
 */
extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurface
    (Uint32 flags, int width, int height, int depth,
     Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceFrom(void *pixels,
                                                              int width,
                                                              int height,
                                                              int depth,
                                                              int pitch,
                                                              Uint32 Rmask,
                                                              Uint32 Gmask,
                                                              Uint32 Bmask,
                                                              Uint32 Amask);
extern DECLSPEC SDL_Surface *SDLCALL
SDL_CreateRGBSurfaceFromTexture(SDL_TextureID textureID);
extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface * surface);

/*
 * SDL_LockSurface() sets up a surface for directly accessing the pixels.
 * Between calls to SDL_LockSurface()/SDL_UnlockSurface(), you can write
 * to and read from 'surface->pixels', using the pixel format stored in 
 * 'surface->format'.  Once you are done accessing the surface, you should 
 * use SDL_UnlockSurface() to release it.
 *
 * Not all surfaces require locking.  If SDL_MUSTLOCK(surface) evaluates
 * to 0, then you can read and write to the surface at any time, and the
 * pixel format of the surface will not change.
 * 
 * No operating system or library calls should be made between lock/unlock
 * pairs, as critical system locks may be held during this time.
 *
 * SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked.
 */
extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface * surface);
extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface * surface);

/*
 * Load a surface from a seekable SDL data source (memory or file.)
 * If 'freesrc' is non-zero, the source will be closed after being read.
 * Returns the new surface, or NULL if there was an error.
 * The new surface should be freed with SDL_FreeSurface().
 */
extern DECLSPEC SDL_Surface *SDLCALL SDL_LoadBMP_RW(SDL_RWops * src,
                                                    int freesrc);

/* Convenience macro -- load a surface from a file */
#define SDL_LoadBMP(file)	SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1)

/*
 * Save a surface to a seekable SDL data source (memory or file.)
 * If 'freedst' is non-zero, the source will be closed after being written.
 * Returns 0 if successful or -1 if there was an error.
 */
extern DECLSPEC int SDLCALL SDL_SaveBMP_RW
    (SDL_Surface * surface, SDL_RWops * dst, int freedst);

/* Convenience macro -- save a surface to a file */
#define SDL_SaveBMP(surface, file) \
		SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)

/*
 * Sets the color key (transparent pixel) in a blittable surface.
 * If 'flag' is SDL_SRCCOLORKEY (optionally OR'd with SDL_RLEACCEL), 
 * 'key' will be the transparent pixel in the source image of a blit.
 * SDL_RLEACCEL requests RLE acceleration for the surface if present,
 * and removes RLE acceleration if absent.
 * If 'flag' is 0, this function clears any current color key.
 * This function returns 0, or -1 if there was an error.
 */
extern DECLSPEC int SDLCALL SDL_SetColorKey
    (SDL_Surface * surface, Uint32 flag, Uint32 key);

/*
 * This function sets the alpha value for the entire surface, as opposed to
 * using the alpha component of each pixel. This value measures the range
 * of transparency of the surface, 0 being completely transparent to 255
 * being completely opaque. An 'alpha' value of 255 causes blits to be
 * opaque, the source pixels copied to the destination (the default). Note
 * that per-surface alpha can be combined with colorkey transparency.
 *
 * If 'flag' is 0, alpha blending is disabled for the surface.
 * If 'flag' is SDL_SRCALPHA, alpha blending is enabled for the surface.
 * OR:ing the flag with SDL_RLEACCEL requests RLE acceleration for the
 * surface; if SDL_RLEACCEL is not specified, the RLE accel will be removed.
 *
 * The 'alpha' parameter is ignored for surfaces that have an alpha channel.
 */
extern DECLSPEC int SDLCALL SDL_SetAlpha(SDL_Surface * surface, Uint32 flag,
                                         Uint8 alpha);

/*
 * Sets the clipping rectangle for the destination surface in a blit.
 *
 * If the clip rectangle is NULL, clipping will be disabled.
 * If the clip rectangle doesn't intersect the surface, the function will
 * return SDL_FALSE and blits will be completely clipped.  Otherwise the
 * function returns SDL_TRUE and blits to the surface will be clipped to
 * the intersection of the surface area and the clipping rectangle.
 *
 * Note that blits are automatically clipped to the edges of the source
 * and destination surfaces.
 */
extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface * surface,
                                                 const SDL_Rect * rect);

/*
 * Gets the clipping rectangle for the destination surface in a blit.
 * 'rect' must be a pointer to a valid rectangle which will be filled
 * with the correct values.
 */
extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface,
                                             SDL_Rect * rect);

/*
 * Creates a new surface of the specified format, and then copies and maps 
 * the given surface to it so the blit of the converted surface will be as 
 * fast as possible.  If this function fails, it returns NULL.
 *
 * The 'flags' parameter is passed to SDL_CreateRGBSurface() and has those 
 * semantics.  You can also pass SDL_RLEACCEL in the flags parameter and
 * SDL will try to RLE accelerate colorkey and alpha blits in the resulting
 * surface.
 *
 * This function is used internally by SDL_DisplayFormat().
 */
extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface
    (SDL_Surface * src, SDL_PixelFormat * fmt, Uint32 flags);

/*
 * This function performs a fast fill of the given rectangle with 'color'
 * The given rectangle is clipped to the destination surface clip area
 * and the final fill rectangle is saved in the passed in pointer.
 * If 'dstrect' is NULL, the whole surface will be filled with 'color'
 * The color should be a pixel of the format used by the surface, and 
 * can be generated by the SDL_MapRGB() function.
 * This function returns 0 on success, or -1 on error.
 */
extern DECLSPEC int SDLCALL SDL_FillRect
    (SDL_Surface * dst, SDL_Rect * dstrect, Uint32 color);

/*
 * This performs a fast blit from the source surface to the destination
 * surface.  It assumes that the source and destination rectangles are
 * the same size.  If either 'srcrect' or 'dstrect' are NULL, the entire
 * surface (src or dst) is copied.  The final blit rectangles are saved
 * in 'srcrect' and 'dstrect' after all clipping is performed.
 * If the blit is successful, it returns 0, otherwise it returns -1.
 *
 * The blit function should not be called on a locked surface.
 *
 * The blit semantics for surfaces with and without alpha and colorkey
 * are defined as follows:
 *
 * RGBA->RGB:
 *     SDL_SRCALPHA set:
 * 	alpha-blend (using alpha-channel).
 * 	SDL_SRCCOLORKEY ignored.
 *     SDL_SRCALPHA not set:
 * 	copy RGB.
 * 	if SDL_SRCCOLORKEY set, only copy the pixels matching the
 * 	RGB values of the source colour key, ignoring alpha in the
 * 	comparison.
 * 
 * RGB->RGBA:
 *     SDL_SRCALPHA set:
 * 	alpha-blend (using the source per-surface alpha value);
 * 	set destination alpha to opaque.
 *     SDL_SRCALPHA not set:
 * 	copy RGB, set destination alpha to source per-surface alpha value.
 *     both:
 * 	if SDL_SRCCOLORKEY set, only copy the pixels matching the
 * 	source colour key.
 * 
 * RGBA->RGBA:
 *     SDL_SRCALPHA set:
 * 	alpha-blend (using the source alpha channel) the RGB values;
 * 	leave destination alpha untouched. [Note: is this correct?]
 * 	SDL_SRCCOLORKEY ignored.
 *     SDL_SRCALPHA not set:
 * 	copy all of RGBA to the destination.
 * 	if SDL_SRCCOLORKEY set, only copy the pixels matching the
 * 	RGB values of the source colour key, ignoring alpha in the
 * 	comparison.
 * 
 * RGB->RGB: 
 *     SDL_SRCALPHA set:
 * 	alpha-blend (using the source per-surface alpha value).
 *     SDL_SRCALPHA not set:
 * 	copy RGB.
 *     both:
 * 	if SDL_SRCCOLORKEY set, only copy the pixels matching the
 * 	source colour key.
 *
 * If either of the surfaces were in video memory, and the blit returns -2,
 * the video memory was lost, so it should be reloaded with artwork and 
 * re-blitted:
	while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
		while ( SDL_LockSurface(image) < 0 )
			Sleep(10);
		-- Write image pixels to image->pixels --
		SDL_UnlockSurface(image);
	}
 * This happens under DirectX 5.0 when the system switches away from your
 * fullscreen application.  The lock will also fail until you have access
 * to the video memory again.
 */
/* You should call SDL_BlitSurface() unless you know exactly how SDL
   blitting works internally and how to use the other blit functions.
*/
#define SDL_BlitSurface SDL_UpperBlit

/* This is the public blit function, SDL_BlitSurface(), and it performs
   rectangle validation and clipping before passing it to SDL_LowerBlit()
*/
extern DECLSPEC int SDLCALL SDL_UpperBlit
    (SDL_Surface * src, SDL_Rect * srcrect,
     SDL_Surface * dst, SDL_Rect * dstrect);
/* This is a semi-private blit function and it performs low-level surface
   blitting only.
*/
extern DECLSPEC int SDLCALL SDL_LowerBlit
    (SDL_Surface * src, SDL_Rect * srcrect,
     SDL_Surface * dst, SDL_Rect * dstrect);

/**
 * \fn int SDL_SoftStretch(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect)
 *
 * \brief Perform a fast, low quality, stretch blit between two surfaces of the same pixel format.
 * \note This function uses a static buffer, and is not thread-safe.
 */
extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src,
                                            SDL_Rect * srcrect,
                                            SDL_Surface * dst,
                                            SDL_Rect * dstrect);

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* OpenGL support functions.                                                 */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Dynamically load an OpenGL library, or the default one if path is NULL
 *
 * If you do this, you need to retrieve all of the GL functions used in
 * your program from the dynamic library using SDL_GL_GetProcAddress().
 */
extern DECLSPEC int SDLCALL SDL_GL_LoadLibrary(const char *path);

/*
 * Get the address of a GL function
 */
extern DECLSPEC void *SDLCALL SDL_GL_GetProcAddress(const char *proc);

/*
 * Set an attribute of the OpenGL subsystem before window creation.
 */
extern DECLSPEC int SDLCALL SDL_GL_SetAttribute(SDL_GLattr attr, int value);

/*
 * Get an attribute of the OpenGL subsystem from the windowing
 * interface, such as glX. This is of course different from getting
 * the values from SDL's internal OpenGL subsystem, which only
 * stores the values you request before initialization.
 *
 * Developers should track the values they pass into SDL_GL_SetAttribute
 * themselves if they want to retrieve these values.
 */
extern DECLSPEC int SDLCALL SDL_GL_GetAttribute(SDL_GLattr attr, int *value);

/*
 * Swap the OpenGL buffers, if double-buffering is supported.
 */
extern DECLSPEC void SDLCALL SDL_GL_SwapBuffers(void);

/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"

#endif /* _SDL_video_h */

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