/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2012 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,
* with the same format as the display surface. This is useful for surfaces
* that will not change much, to take advantage of hardware acceleration
* when being blitted to the display surface.
* SDL_ASYNCBLIT means that SDL will try to perform asynchronous blits with
* this surface, but you must always lock it before accessing the pixels.
* SDL will wait for current blits to finish before returning from the lock.
* SDL_SRCCOLORKEY indicates that the surface will be used for colorkey blits.
* If the hardware supports acceleration of colorkey blits between
* two surfaces in video memory, SDL will try to place the surface in
* video memory. If this isn't possible or if there is no hardware
* acceleration available, the surface will be placed in system memory.
* SDL_SRCALPHA means that the surface will be used for alpha blits and
* if the hardware supports hardware acceleration of alpha blits between
* two surfaces in video memory, to place the surface in video memory
* if possible, otherwise it will be placed in system memory.
* If the surface is created in video memory, blits will be _much_ faster,
* but the surface format must be identical to the video surface format,
* and the only way to access the pixels member of the surface is to use
* the SDL_LockSurface() and SDL_UnlockSurface() calls.
* If the requested surface actually resides in video memory, SDL_HWSURFACE
* will be set in the flags member of the returned surface. If for some
* reason the surface could not be placed in video memory, it will not have
* the SDL_HWSURFACE flag set, and will be created in system memory instead.
*/
extern DECLSPEC SDL_Surface * SDLCALL SDL_CreateRGBSurface
(Uint32 flags, int width, int height, int depth,
Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
/** @sa SDL_CreateRGBSurface */
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 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. In particular, if the
* SDL_HWSURFACE flag is not given when calling SDL_SetVideoMode(), you
* will not need to lock the display surface before accessing it.
*
* 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 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:
* @code
* while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
* while ( SDL_LockSurface(image) < 0 )
* Sleep(10);
* -- Write image pixels to image->pixels --
* SDL_UnlockSurface(image);
* }
* @endcode
*
* 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);
/**
* 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 function takes a surface and copies it to a new surface of the
* pixel format and colors of the video framebuffer, suitable for fast
* blitting onto the display surface. It calls SDL_ConvertSurface()
*
* 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.
*
* If the conversion fails or runs out of memory, it returns NULL
*/
extern DECLSPEC SDL_Surface * SDLCALL SDL_DisplayFormat(SDL_Surface *surface);
/**
* This function takes a surface and copies it to a new surface of the
* pixel format and colors of the video framebuffer (if possible),
* suitable for fast alpha blitting onto the display surface.
* The new surface will always have an alpha channel.
*
* 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.
*
* If the conversion fails or runs out of memory, it returns NULL
*/
extern DECLSPEC SDL_Surface * SDLCALL SDL_DisplayFormatAlpha(SDL_Surface *surface);
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/** @name YUV video surface overlay functions */ /*@{*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/** This function creates a video output overlay
* Calling the returned surface an overlay is something of a misnomer because
* the contents of the display surface underneath the area where the overlay
* is shown is undefined - it may be overwritten with the converted YUV data.
*/
extern DECLSPEC SDL_Overlay * SDLCALL SDL_CreateYUVOverlay(int width, int height,
Uint32 format, SDL_Surface *display);
/** Lock an overlay for direct access, and unlock it when you are done */
extern DECLSPEC int SDLCALL SDL_LockYUVOverlay(SDL_Overlay *overlay);
extern DECLSPEC void SDLCALL SDL_UnlockYUVOverlay(SDL_Overlay *overlay);
/** Blit a video overlay to the display surface.
* The contents of the video surface underneath the blit destination are
* not defined.
* The width and height of the destination rectangle may be different from
* that of the overlay, but currently only 2x scaling is supported.
*/
extern DECLSPEC int SDLCALL SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect);
/** Free a video overlay */
extern DECLSPEC void SDLCALL SDL_FreeYUVOverlay(SDL_Overlay *overlay);
/*@}*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/** @name 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 intialization.
*/
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);
/** @name OpenGL Internal Functions
* Internal functions that should not be called unless you have read
* and understood the source code for these functions.
*/
/*@{*/
extern DECLSPEC void SDLCALL SDL_GL_UpdateRects(int numrects, SDL_Rect* rects);
extern DECLSPEC void SDLCALL SDL_GL_Lock(void);
extern DECLSPEC void SDLCALL SDL_GL_Unlock(void);
/*@}*/
/*@}*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/** @name Window Manager Functions */
/** These functions allow interaction with the window manager, if any. */ /*@{*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/**
* Sets the title and icon text of the display window (UTF-8 encoded)
*/
extern DECLSPEC void SDLCALL SDL_WM_SetCaption(const char *title, const char *icon);
/**
* Gets the title and icon text of the display window (UTF-8 encoded)
*/
extern DECLSPEC void SDLCALL SDL_WM_GetCaption(char **title, char **icon);
/**
* Sets the icon for the display window.
* This function must be called before the first call to SDL_SetVideoMode().
* It takes an icon surface, and a mask in MSB format.
* If 'mask' is NULL, the entire icon surface will be used as the icon.
*/
extern DECLSPEC void SDLCALL SDL_WM_SetIcon(SDL_Surface *icon, Uint8 *mask);
/**
* This function iconifies the window, and returns 1 if it succeeded.
* If the function succeeds, it generates an SDL_APPACTIVE loss event.
* This function is a noop and returns 0 in non-windowed environments.
*/
extern DECLSPEC int SDLCALL SDL_WM_IconifyWindow(void);
/**
* Toggle fullscreen mode without changing the contents of the screen.
* If the display surface does not require locking before accessing
* the pixel information, then the memory pointers will not change.
*
* If this function was able to toggle fullscreen mode (change from
* running in a window to fullscreen, or vice-versa), it will return 1.
* If it is not implemented, or fails, it returns 0.
*
* The next call to SDL_SetVideoMode() will set the mode fullscreen
* attribute based on the flags parameter - if SDL_FULLSCREEN is not
* set, then the display will be windowed by default where supported.
*
* This is currently only implemented in the X11 video driver.
*/
extern DECLSPEC int SDLCALL SDL_WM_ToggleFullScreen(SDL_Surface *surface);
typedef enum {
SDL_GRAB_QUERY = -1,
SDL_GRAB_OFF = 0,
SDL_GRAB_ON = 1,
SDL_GRAB_FULLSCREEN /**< Used internally */
} SDL_GrabMode;
/**
* This function allows you to set and query the input grab state of
* the application. It returns the new input grab state.
*
* Grabbing means that the mouse is confined to the application window,
* and nearly all keyboard input is passed directly to the application,
* and not interpreted by a window manager, if any.
*/
extern DECLSPEC SDL_GrabMode SDLCALL SDL_WM_GrabInput(SDL_GrabMode mode);
/*@}*/
/** @internal Not in public API at the moment - do not use! */
extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
SDL_Surface *dst, SDL_Rect *dstrect);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#include "close_code.h"
#endif /* _SDL_video_h */