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  1. /*
  2.     SDL - Simple DirectMedia Layer
  3.     Copyright (C) 1997-2004 Sam Lantinga
  4.  
  5.     This library is free software; you can redistribute it and/or
  6.     modify it under the terms of the GNU Library General Public
  7.     License as published by the Free Software Foundation; either
  8.     version 2 of the License, or (at your option) any later version.
  9.  
  10.     This library is distributed in the hope that it will be useful,
  11.     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13.     Library General Public License for more details.
  14.  
  15.     You should have received a copy of the GNU Library General Public
  16.     License along with this library; if not, write to the Free
  17.     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18.  
  19.     Sam Lantinga
  20.     slouken@libsdl.org
  21. */
  22.  
  23. #ifdef SAVE_RCSID
  24. static char rcsid =
  25.  "@(#) $Id: SDL_video.h,v 1.17 2004/01/04 16:49:08 slouken Exp $";
  26. #endif
  27.  
  28. /* Header file for access to the SDL raw framebuffer window */
  29.  
  30. #ifndef _SDL_video_h
  31. #define _SDL_video_h
  32.  
  33. #include <stdio.h>
  34.  
  35. #include "SDL_types.h"
  36. #include "SDL_mutex.h"
  37. #include "SDL_rwops.h"
  38.  
  39. #include "begin_code.h"
  40. /* Set up for C function definitions, even when using C++ */
  41. #ifdef __cplusplus
  42. extern "C" {
  43. #endif
  44.  
  45. /* Transparency definitions: These define alpha as the opacity of a surface */
  46. #define SDL_ALPHA_OPAQUE 255
  47. #define SDL_ALPHA_TRANSPARENT 0
  48.  
  49. /* Useful data types */
  50. typedef struct {
  51.         Sint16 x, y;
  52.         Uint16 w, h;
  53. } SDL_Rect;
  54.  
  55. typedef struct {
  56.         Uint8 r;
  57.         Uint8 g;
  58.         Uint8 b;
  59.         Uint8 unused;
  60. } SDL_Color;
  61. #define SDL_Colour SDL_Color
  62.  
  63. typedef struct {
  64.         int       ncolors;
  65.         SDL_Color *colors;
  66. } SDL_Palette;
  67.  
  68. /* Everything in the pixel format structure is read-only */
  69. typedef struct SDL_PixelFormat {
  70.         SDL_Palette *palette;
  71.         Uint8  BitsPerPixel;
  72.         Uint8  BytesPerPixel;
  73.         Uint8  Rloss;
  74.         Uint8  Gloss;
  75.         Uint8  Bloss;
  76.         Uint8  Aloss;
  77.         Uint8  Rshift;
  78.         Uint8  Gshift;
  79.         Uint8  Bshift;
  80.         Uint8  Ashift;
  81.         Uint32 Rmask;
  82.         Uint32 Gmask;
  83.         Uint32 Bmask;
  84.         Uint32 Amask;
  85.  
  86.         /* RGB color key information */
  87.         Uint32 colorkey;
  88.         /* Alpha value information (per-surface alpha) */
  89.         Uint8  alpha;
  90. } SDL_PixelFormat;
  91.  
  92. /* typedef for private surface blitting functions */
  93. struct SDL_Surface;
  94. typedef int (*SDL_blit)(struct SDL_Surface *src, SDL_Rect *srcrect,
  95.                         struct SDL_Surface *dst, SDL_Rect *dstrect);
  96.  
  97. /* This structure should be treated as read-only, except for 'pixels',
  98.    which, if not NULL, contains the raw pixel data for the surface.
  99. */
  100. typedef struct SDL_Surface {
  101.         Uint32 flags;                           /* Read-only */
  102.         SDL_PixelFormat *format;                /* Read-only */
  103.         int w, h;                               /* Read-only */
  104.         Uint16 pitch;                           /* Read-only */
  105.         void *pixels;                           /* Read-write */
  106.         int offset;                             /* Private */
  107.  
  108.         /* Hardware-specific surface info */
  109.         struct private_hwdata *hwdata;
  110.  
  111.         /* clipping information */
  112.         SDL_Rect clip_rect;                     /* Read-only */
  113.         Uint32 unused1;                         /* for binary compatibility */
  114.  
  115.         /* Allow recursive locks */
  116.         Uint32 locked;                          /* Private */
  117.  
  118.         /* info for fast blit mapping to other surfaces */
  119.         struct SDL_BlitMap *map;                /* Private */
  120.  
  121.         /* format version, bumped at every change to invalidate blit maps */
  122.         unsigned int format_version;            /* Private */
  123.  
  124.         /* Reference count -- used when freeing surface */
  125.         int refcount;                           /* Read-mostly */
  126. } SDL_Surface;
  127.  
  128. /* These are the currently supported flags for the SDL_surface */
  129. /* Available for SDL_CreateRGBSurface() or SDL_SetVideoMode() */
  130. #define SDL_SWSURFACE   0x00000000      /* Surface is in system memory */
  131. #define SDL_HWSURFACE   0x00000001      /* Surface is in video memory */
  132. #define SDL_ASYNCBLIT   0x00000004      /* Use asynchronous blits if possible */
  133. /* Available for SDL_SetVideoMode() */
  134. #define SDL_ANYFORMAT   0x10000000      /* Allow any video depth/pixel-format */
  135. #define SDL_HWPALETTE   0x20000000      /* Surface has exclusive palette */
  136. #define SDL_DOUBLEBUF   0x40000000      /* Set up double-buffered video mode */
  137. #define SDL_FULLSCREEN  0x80000000      /* Surface is a full screen display */
  138. #define SDL_OPENGL      0x00000002      /* Create an OpenGL rendering context */
  139. #define SDL_OPENGLBLIT  0x0000000A      /* Create an OpenGL rendering context and use it for blitting */
  140. #define SDL_RESIZABLE   0x00000010      /* This video mode may be resized */
  141. #define SDL_NOFRAME     0x00000020      /* No window caption or edge frame */
  142. /* Used internally (read-only) */
  143. #define SDL_HWACCEL     0x00000100      /* Blit uses hardware acceleration */
  144. #define SDL_SRCCOLORKEY 0x00001000      /* Blit uses a source color key */
  145. #define SDL_RLEACCELOK  0x00002000      /* Private flag */
  146. #define SDL_RLEACCEL    0x00004000      /* Surface is RLE encoded */
  147. #define SDL_SRCALPHA    0x00010000      /* Blit uses source alpha blending */
  148. #define SDL_PREALLOC    0x01000000      /* Surface uses preallocated memory */
  149.  
  150. /* Evaluates to true if the surface needs to be locked before access */
  151. #define SDL_MUSTLOCK(surface)   \
  152.   (surface->offset ||           \
  153.   ((surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_RLEACCEL)) != 0))
  154.  
  155.  
  156. /* Useful for determining the video hardware capabilities */
  157. typedef struct {
  158.         Uint32 hw_available :1; /* Flag: Can you create hardware surfaces? */
  159.         Uint32 wm_available :1; /* Flag: Can you talk to a window manager? */
  160.         Uint32 UnusedBits1  :6;
  161.         Uint32 UnusedBits2  :1;
  162.         Uint32 blit_hw      :1; /* Flag: Accelerated blits HW --> HW */
  163.         Uint32 blit_hw_CC   :1; /* Flag: Accelerated blits with Colorkey */
  164.         Uint32 blit_hw_A    :1; /* Flag: Accelerated blits with Alpha */
  165.         Uint32 blit_sw      :1; /* Flag: Accelerated blits SW --> HW */
  166.         Uint32 blit_sw_CC   :1; /* Flag: Accelerated blits with Colorkey */
  167.         Uint32 blit_sw_A    :1; /* Flag: Accelerated blits with Alpha */
  168.         Uint32 blit_fill    :1; /* Flag: Accelerated color fill */
  169.         Uint32 UnusedBits3  :16;
  170.         Uint32 video_mem;       /* The total amount of video memory (in K) */
  171.         SDL_PixelFormat *vfmt;  /* Value: The format of the video surface */
  172. } SDL_VideoInfo;
  173.  
  174.  
  175. /* The most common video overlay formats.
  176.    For an explanation of these pixel formats, see:
  177.         http://www.webartz.com/fourcc/indexyuv.htm
  178.  
  179.    For information on the relationship between color spaces, see:
  180.    http://www.neuro.sfc.keio.ac.jp/~aly/polygon/info/color-space-faq.html
  181.  */
  182. #define SDL_YV12_OVERLAY  0x32315659    /* Planar mode: Y + V + U  (3 planes) */
  183. #define SDL_IYUV_OVERLAY  0x56555949    /* Planar mode: Y + U + V  (3 planes) */
  184. #define SDL_YUY2_OVERLAY  0x32595559    /* Packed mode: Y0+U0+Y1+V0 (1 plane) */
  185. #define SDL_UYVY_OVERLAY  0x59565955    /* Packed mode: U0+Y0+V0+Y1 (1 plane) */
  186. #define SDL_YVYU_OVERLAY  0x55595659    /* Packed mode: Y0+V0+Y1+U0 (1 plane) */
  187.  
  188. /* The YUV hardware video overlay */
  189. typedef struct SDL_Overlay {
  190.         Uint32 format;                          /* Read-only */
  191.         int w, h;                               /* Read-only */
  192.         int planes;                             /* Read-only */
  193.         Uint16 *pitches;                        /* Read-only */
  194.         Uint8 **pixels;                         /* Read-write */
  195.  
  196.         /* Hardware-specific surface info */
  197.         struct private_yuvhwfuncs *hwfuncs;
  198.         struct private_yuvhwdata *hwdata;
  199.  
  200.         /* Special flags */
  201.         Uint32 hw_overlay :1;   /* Flag: This overlay hardware accelerated? */
  202.         Uint32 UnusedBits :31;
  203. } SDL_Overlay;
  204.  
  205.  
  206. /* Public enumeration for setting the OpenGL window attributes. */
  207. typedef enum {
  208.     SDL_GL_RED_SIZE,
  209.     SDL_GL_GREEN_SIZE,
  210.     SDL_GL_BLUE_SIZE,
  211.     SDL_GL_ALPHA_SIZE,
  212.     SDL_GL_BUFFER_SIZE,
  213.     SDL_GL_DOUBLEBUFFER,
  214.     SDL_GL_DEPTH_SIZE,
  215.     SDL_GL_STENCIL_SIZE,
  216.     SDL_GL_ACCUM_RED_SIZE,
  217.     SDL_GL_ACCUM_GREEN_SIZE,
  218.     SDL_GL_ACCUM_BLUE_SIZE,
  219.     SDL_GL_ACCUM_ALPHA_SIZE,
  220.     SDL_GL_STEREO,
  221.     SDL_GL_MULTISAMPLEBUFFERS,
  222.     SDL_GL_MULTISAMPLESAMPLES
  223. } SDL_GLattr;
  224.  
  225. /* flags for SDL_SetPalette() */
  226. #define SDL_LOGPAL 0x01
  227. #define SDL_PHYSPAL 0x02
  228.  
  229. /* Function prototypes */
  230.  
  231. /* These functions are used internally, and should not be used unless you
  232.  * have a specific need to specify the video driver you want to use.
  233.  * You should normally use SDL_Init() or SDL_InitSubSystem().
  234.  *
  235.  * SDL_VideoInit() initializes the video subsystem -- sets up a connection
  236.  * to the window manager, etc, and determines the current video mode and
  237.  * pixel format, but does not initialize a window or graphics mode.
  238.  * Note that event handling is activated by this routine.
  239.  *
  240.  * If you use both sound and video in your application, you need to call
  241.  * SDL_Init() before opening the sound device, otherwise under Win32 DirectX,
  242.  * you won't be able to set full-screen display modes.
  243.  */
  244. extern DECLSPEC int SDLCALL SDL_VideoInit(const char *driver_name, Uint32 flags);
  245. extern DECLSPEC void SDLCALL SDL_VideoQuit(void);
  246.  
  247. /* This function fills the given character buffer with the name of the
  248.  * video driver, and returns a pointer to it if the video driver has
  249.  * been initialized.  It returns NULL if no driver has been initialized.
  250.  */
  251. extern DECLSPEC char * SDLCALL SDL_VideoDriverName(char *namebuf, int maxlen);
  252.  
  253. /*
  254.  * This function returns a pointer to the current display surface.
  255.  * If SDL is doing format conversion on the display surface, this
  256.  * function returns the publicly visible surface, not the real video
  257.  * surface.
  258.  */
  259. extern DECLSPEC SDL_Surface * SDLCALL SDL_GetVideoSurface(void);
  260.  
  261. /*
  262.  * This function returns a read-only pointer to information about the
  263.  * video hardware.  If this is called before SDL_SetVideoMode(), the 'vfmt'
  264.  * member of the returned structure will contain the pixel format of the
  265.  * "best" video mode.
  266.  */
  267. extern DECLSPEC const SDL_VideoInfo * SDLCALL SDL_GetVideoInfo(void);
  268.  
  269. /*
  270.  * Check to see if a particular video mode is supported.
  271.  * It returns 0 if the requested mode is not supported under any bit depth,
  272.  * or returns the bits-per-pixel of the closest available mode with the
  273.  * given width and height.  If this bits-per-pixel is different from the
  274.  * one used when setting the video mode, SDL_SetVideoMode() will succeed,
  275.  * but will emulate the requested bits-per-pixel with a shadow surface.
  276.  *
  277.  * The arguments to SDL_VideoModeOK() are the same ones you would pass to
  278.  * SDL_SetVideoMode()
  279.  */
  280. extern DECLSPEC int SDLCALL SDL_VideoModeOK(int width, int height, int bpp, Uint32 flags);
  281.  
  282. /*
  283.  * Return a pointer to an array of available screen dimensions for the
  284.  * given format and video flags, sorted largest to smallest.  Returns
  285.  * NULL if there are no dimensions available for a particular format,
  286.  * or (SDL_Rect **)-1 if any dimension is okay for the given format.
  287.  *
  288.  * If 'format' is NULL, the mode list will be for the format given
  289.  * by SDL_GetVideoInfo()->vfmt
  290.  */
  291. extern DECLSPEC SDL_Rect ** SDLCALL SDL_ListModes(SDL_PixelFormat *format, Uint32 flags);
  292.  
  293. /*
  294.  * Set up a video mode with the specified width, height and bits-per-pixel.
  295.  *
  296.  * If 'bpp' is 0, it is treated as the current display bits per pixel.
  297.  *
  298.  * If SDL_ANYFORMAT is set in 'flags', the SDL library will try to set the
  299.  * requested bits-per-pixel, but will return whatever video pixel format is
  300.  * available.  The default is to emulate the requested pixel format if it
  301.  * is not natively available.
  302.  *
  303.  * If SDL_HWSURFACE is set in 'flags', the video surface will be placed in
  304.  * video memory, if possible, and you may have to call SDL_LockSurface()
  305.  * in order to access the raw framebuffer.  Otherwise, the video surface
  306.  * will be created in system memory.
  307.  *
  308.  * If SDL_ASYNCBLIT is set in 'flags', SDL will try to perform rectangle
  309.  * updates asynchronously, but you must always lock before accessing pixels.
  310.  * SDL will wait for updates to complete before returning from the lock.
  311.  *
  312.  * If SDL_HWPALETTE is set in 'flags', the SDL library will guarantee
  313.  * that the colors set by SDL_SetColors() will be the colors you get.
  314.  * Otherwise, in 8-bit mode, SDL_SetColors() may not be able to set all
  315.  * of the colors exactly the way they are requested, and you should look
  316.  * at the video surface structure to determine the actual palette.
  317.  * If SDL cannot guarantee that the colors you request can be set,
  318.  * i.e. if the colormap is shared, then the video surface may be created
  319.  * under emulation in system memory, overriding the SDL_HWSURFACE flag.
  320.  *
  321.  * If SDL_FULLSCREEN is set in 'flags', the SDL library will try to set
  322.  * a fullscreen video mode.  The default is to create a windowed mode
  323.  * if the current graphics system has a window manager.
  324.  * If the SDL library is able to set a fullscreen video mode, this flag
  325.  * will be set in the surface that is returned.
  326.  *
  327.  * If SDL_DOUBLEBUF is set in 'flags', the SDL library will try to set up
  328.  * two surfaces in video memory and swap between them when you call
  329.  * SDL_Flip().  This is usually slower than the normal single-buffering
  330.  * scheme, but prevents "tearing" artifacts caused by modifying video
  331.  * memory while the monitor is refreshing.  It should only be used by
  332.  * applications that redraw the entire screen on every update.
  333.  *
  334.  * If SDL_RESIZABLE is set in 'flags', the SDL library will allow the
  335.  * window manager, if any, to resize the window at runtime.  When this
  336.  * occurs, SDL will send a SDL_VIDEORESIZE event to you application,
  337.  * and you must respond to the event by re-calling SDL_SetVideoMode()
  338.  * with the requested size (or another size that suits the application).
  339.  *
  340.  * If SDL_NOFRAME is set in 'flags', the SDL library will create a window
  341.  * without any title bar or frame decoration.  Fullscreen video modes have
  342.  * this flag set automatically.
  343.  *
  344.  * This function returns the video framebuffer surface, or NULL if it fails.
  345.  *
  346.  * If you rely on functionality provided by certain video flags, check the
  347.  * flags of the returned surface to make sure that functionality is available.
  348.  * SDL will fall back to reduced functionality if the exact flags you wanted
  349.  * are not available.
  350.  */
  351. extern DECLSPEC SDL_Surface * SDLCALL SDL_SetVideoMode
  352.                         (int width, int height, int bpp, Uint32 flags);
  353.  
  354. /*
  355.  * Makes sure the given list of rectangles is updated on the given screen.
  356.  * If 'x', 'y', 'w' and 'h' are all 0, SDL_UpdateRect will update the entire
  357.  * screen.
  358.  * These functions should not be called while 'screen' is locked.
  359.  */
  360. extern DECLSPEC void SDLCALL SDL_UpdateRects
  361.                 (SDL_Surface *screen, int numrects, SDL_Rect *rects);
  362. extern DECLSPEC void SDLCALL SDL_UpdateRect
  363.                 (SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h);
  364.  
  365. /*
  366.  * On hardware that supports double-buffering, this function sets up a flip
  367.  * and returns.  The hardware will wait for vertical retrace, and then swap
  368.  * video buffers before the next video surface blit or lock will return.
  369.  * On hardware that doesn not support double-buffering, this is equivalent
  370.  * to calling SDL_UpdateRect(screen, 0, 0, 0, 0);
  371.  * The SDL_DOUBLEBUF flag must have been passed to SDL_SetVideoMode() when
  372.  * setting the video mode for this function to perform hardware flipping.
  373.  * This function returns 0 if successful, or -1 if there was an error.
  374.  */
  375. extern DECLSPEC int SDLCALL SDL_Flip(SDL_Surface *screen);
  376.  
  377. /*
  378.  * Set the gamma correction for each of the color channels.
  379.  * The gamma values range (approximately) between 0.1 and 10.0
  380.  *
  381.  * If this function isn't supported directly by the hardware, it will
  382.  * be emulated using gamma ramps, if available.  If successful, this
  383.  * function returns 0, otherwise it returns -1.
  384.  */
  385. extern DECLSPEC int SDLCALL SDL_SetGamma(float red, float green, float blue);
  386.  
  387. /*
  388.  * Set the gamma translation table for the red, green, and blue channels
  389.  * of the video hardware.  Each table is an array of 256 16-bit quantities,
  390.  * representing a mapping between the input and output for that channel.
  391.  * The input is the index into the array, and the output is the 16-bit
  392.  * gamma value at that index, scaled to the output color precision.
  393.  *
  394.  * You may pass NULL for any of the channels to leave it unchanged.
  395.  * If the call succeeds, it will return 0.  If the display driver or
  396.  * hardware does not support gamma translation, or otherwise fails,
  397.  * this function will return -1.
  398.  */
  399. extern DECLSPEC int SDLCALL SDL_SetGammaRamp(const Uint16 *red, const Uint16 *green, const Uint16 *blue);
  400.  
  401. /*
  402.  * Retrieve the current values of the gamma translation tables.
  403.  *
  404.  * You must pass in valid pointers to arrays of 256 16-bit quantities.
  405.  * Any of the pointers may be NULL to ignore that channel.
  406.  * If the call succeeds, it will return 0.  If the display driver or
  407.  * hardware does not support gamma translation, or otherwise fails,
  408.  * this function will return -1.
  409.  */
  410. extern DECLSPEC int SDLCALL SDL_GetGammaRamp(Uint16 *red, Uint16 *green, Uint16 *blue);
  411.  
  412. /*
  413.  * Sets a portion of the colormap for the given 8-bit surface.  If 'surface'
  414.  * is not a palettized surface, this function does nothing, returning 0.
  415.  * If all of the colors were set as passed to SDL_SetColors(), it will
  416.  * return 1.  If not all the color entries were set exactly as given,
  417.  * it will return 0, and you should look at the surface palette to
  418.  * determine the actual color palette.
  419.  *
  420.  * When 'surface' is the surface associated with the current display, the
  421.  * display colormap will be updated with the requested colors.  If
  422.  * SDL_HWPALETTE was set in SDL_SetVideoMode() flags, SDL_SetColors()
  423.  * will always return 1, and the palette is guaranteed to be set the way
  424.  * you desire, even if the window colormap has to be warped or run under
  425.  * emulation.
  426.  */
  427. extern DECLSPEC int SDLCALL SDL_SetColors(SDL_Surface *surface,
  428.                         SDL_Color *colors, int firstcolor, int ncolors);
  429.  
  430. /*
  431.  * Sets a portion of the colormap for a given 8-bit surface.
  432.  * 'flags' is one or both of:
  433.  * SDL_LOGPAL  -- set logical palette, which controls how blits are mapped
  434.  *                to/from the surface,
  435.  * SDL_PHYSPAL -- set physical palette, which controls how pixels look on
  436.  *                the screen
  437.  * Only screens have physical palettes. Separate change of physical/logical
  438.  * palettes is only possible if the screen has SDL_HWPALETTE set.
  439.  *
  440.  * The return value is 1 if all colours could be set as requested, and 0
  441.  * otherwise.
  442.  *
  443.  * SDL_SetColors() is equivalent to calling this function with
  444.  *     flags = (SDL_LOGPAL|SDL_PHYSPAL).
  445.  */
  446. extern DECLSPEC int SDLCALL SDL_SetPalette(SDL_Surface *surface, int flags,
  447.                                    SDL_Color *colors, int firstcolor,
  448.                                    int ncolors);
  449.  
  450. /*
  451.  * Maps an RGB triple to an opaque pixel value for a given pixel format
  452.  */
  453. extern DECLSPEC Uint32 SDLCALL SDL_MapRGB
  454.                         (SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b);
  455.  
  456. /*
  457.  * Maps an RGBA quadruple to a pixel value for a given pixel format
  458.  */
  459. extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(SDL_PixelFormat *format,
  460.                                    Uint8 r, Uint8 g, Uint8 b, Uint8 a);
  461.  
  462. /*
  463.  * Maps a pixel value into the RGB components for a given pixel format
  464.  */
  465. extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt,
  466.                                 Uint8 *r, Uint8 *g, Uint8 *b);
  467.  
  468. /*
  469.  * Maps a pixel value into the RGBA components for a given pixel format
  470.  */
  471. extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt,
  472.                                  Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);
  473.  
  474. /*
  475.  * Allocate and free an RGB surface (must be called after SDL_SetVideoMode)
  476.  * If the depth is 4 or 8 bits, an empty palette is allocated for the surface.
  477.  * If the depth is greater than 8 bits, the pixel format is set using the
  478.  * flags '[RGB]mask'.
  479.  * If the function runs out of memory, it will return NULL.
  480.  *
  481.  * The 'flags' tell what kind of surface to create.
  482.  * SDL_SWSURFACE means that the surface should be created in system memory.
  483.  * SDL_HWSURFACE means that the surface should be created in video memory,
  484.  * with the same format as the display surface.  This is useful for surfaces
  485.  * that will not change much, to take advantage of hardware acceleration
  486.  * when being blitted to the display surface.
  487.  * SDL_ASYNCBLIT means that SDL will try to perform asynchronous blits with
  488.  * this surface, but you must always lock it before accessing the pixels.
  489.  * SDL will wait for current blits to finish before returning from the lock.
  490.  * SDL_SRCCOLORKEY indicates that the surface will be used for colorkey blits.
  491.  * If the hardware supports acceleration of colorkey blits between
  492.  * two surfaces in video memory, SDL will try to place the surface in
  493.  * video memory. If this isn't possible or if there is no hardware
  494.  * acceleration available, the surface will be placed in system memory.
  495.  * SDL_SRCALPHA means that the surface will be used for alpha blits and
  496.  * if the hardware supports hardware acceleration of alpha blits between
  497.  * two surfaces in video memory, to place the surface in video memory
  498.  * if possible, otherwise it will be placed in system memory.
  499.  * If the surface is created in video memory, blits will be _much_ faster,
  500.  * but the surface format must be identical to the video surface format,
  501.  * and the only way to access the pixels member of the surface is to use
  502.  * the SDL_LockSurface() and SDL_UnlockSurface() calls.
  503.  * If the requested surface actually resides in video memory, SDL_HWSURFACE
  504.  * will be set in the flags member of the returned surface.  If for some
  505.  * reason the surface could not be placed in video memory, it will not have
  506.  * the SDL_HWSURFACE flag set, and will be created in system memory instead.
  507.  */
  508. #define SDL_AllocSurface    SDL_CreateRGBSurface
  509. extern DECLSPEC SDL_Surface * SDLCALL SDL_CreateRGBSurface
  510.                         (Uint32 flags, int width, int height, int depth,
  511.                         Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
  512. extern DECLSPEC SDL_Surface * SDLCALL SDL_CreateRGBSurfaceFrom(void *pixels,
  513.                         int width, int height, int depth, int pitch,
  514.                         Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
  515. extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface *surface);
  516.  
  517. /*
  518.  * SDL_LockSurface() sets up a surface for directly accessing the pixels.
  519.  * Between calls to SDL_LockSurface()/SDL_UnlockSurface(), you can write
  520.  * to and read from 'surface->pixels', using the pixel format stored in
  521.  * 'surface->format'.  Once you are done accessing the surface, you should
  522.  * use SDL_UnlockSurface() to release it.
  523.  *
  524.  * Not all surfaces require locking.  If SDL_MUSTLOCK(surface) evaluates
  525.  * to 0, then you can read and write to the surface at any time, and the
  526.  * pixel format of the surface will not change.  In particular, if the
  527.  * SDL_HWSURFACE flag is not given when calling SDL_SetVideoMode(), you
  528.  * will not need to lock the display surface before accessing it.
  529.  *
  530.  * No operating system or library calls should be made between lock/unlock
  531.  * pairs, as critical system locks may be held during this time.
  532.  *
  533.  * SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked.
  534.  */
  535. extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface *surface);
  536. extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface *surface);
  537.  
  538. /*
  539.  * Load a surface from a seekable SDL data source (memory or file.)
  540.  * If 'freesrc' is non-zero, the source will be closed after being read.
  541.  * Returns the new surface, or NULL if there was an error.
  542.  * The new surface should be freed with SDL_FreeSurface().
  543.  */
  544. extern DECLSPEC SDL_Surface * SDLCALL SDL_LoadBMP_RW(SDL_RWops *src, int freesrc);
  545.  
  546. /* Convenience macro -- load a surface from a file */
  547. #define SDL_LoadBMP(file)       SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1)
  548.  
  549. /*
  550.  * Save a surface to a seekable SDL data source (memory or file.)
  551.  * If 'freedst' is non-zero, the source will be closed after being written.
  552.  * Returns 0 if successful or -1 if there was an error.
  553.  */
  554. extern DECLSPEC int SDLCALL SDL_SaveBMP_RW
  555.                 (SDL_Surface *surface, SDL_RWops *dst, int freedst);
  556.  
  557. /* Convenience macro -- save a surface to a file */
  558. #define SDL_SaveBMP(surface, file) \
  559.                 SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)
  560.  
  561. /*
  562.  * Sets the color key (transparent pixel) in a blittable surface.
  563.  * If 'flag' is SDL_SRCCOLORKEY (optionally OR'd with SDL_RLEACCEL),
  564.  * 'key' will be the transparent pixel in the source image of a blit.
  565.  * SDL_RLEACCEL requests RLE acceleration for the surface if present,
  566.  * and removes RLE acceleration if absent.
  567.  * If 'flag' is 0, this function clears any current color key.
  568.  * This function returns 0, or -1 if there was an error.
  569.  */
  570. extern DECLSPEC int SDLCALL SDL_SetColorKey
  571.                         (SDL_Surface *surface, Uint32 flag, Uint32 key);
  572.  
  573. /*
  574.  * This function sets the alpha value for the entire surface, as opposed to
  575.  * using the alpha component of each pixel. This value measures the range
  576.  * of transparency of the surface, 0 being completely transparent to 255
  577.  * being completely opaque. An 'alpha' value of 255 causes blits to be
  578.  * opaque, the source pixels copied to the destination (the default). Note
  579.  * that per-surface alpha can be combined with colorkey transparency.
  580.  *
  581.  * If 'flag' is 0, alpha blending is disabled for the surface.
  582.  * If 'flag' is SDL_SRCALPHA, alpha blending is enabled for the surface.
  583.  * OR:ing the flag with SDL_RLEACCEL requests RLE acceleration for the
  584.  * surface; if SDL_RLEACCEL is not specified, the RLE accel will be removed.
  585.  *
  586.  * The 'alpha' parameter is ignored for surfaces that have an alpha channel.
  587.  */
  588. extern DECLSPEC int SDLCALL SDL_SetAlpha(SDL_Surface *surface, Uint32 flag, Uint8 alpha);
  589.  
  590. /*
  591.  * Sets the clipping rectangle for the destination surface in a blit.
  592.  *
  593.  * If the clip rectangle is NULL, clipping will be disabled.
  594.  * If the clip rectangle doesn't intersect the surface, the function will
  595.  * return SDL_FALSE and blits will be completely clipped.  Otherwise the
  596.  * function returns SDL_TRUE and blits to the surface will be clipped to
  597.  * the intersection of the surface area and the clipping rectangle.
  598.  *
  599.  * Note that blits are automatically clipped to the edges of the source
  600.  * and destination surfaces.
  601.  */
  602. extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect);
  603.  
  604. /*
  605.  * Gets the clipping rectangle for the destination surface in a blit.
  606.  * 'rect' must be a pointer to a valid rectangle which will be filled
  607.  * with the correct values.
  608.  */
  609. extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect);
  610.  
  611. /*
  612.  * Creates a new surface of the specified format, and then copies and maps
  613.  * the given surface to it so the blit of the converted surface will be as
  614.  * fast as possible.  If this function fails, it returns NULL.
  615.  *
  616.  * The 'flags' parameter is passed to SDL_CreateRGBSurface() and has those
  617.  * semantics.  You can also pass SDL_RLEACCEL in the flags parameter and
  618.  * SDL will try to RLE accelerate colorkey and alpha blits in the resulting
  619.  * surface.
  620.  *
  621.  * This function is used internally by SDL_DisplayFormat().
  622.  */
  623. extern DECLSPEC SDL_Surface * SDLCALL SDL_ConvertSurface
  624.                         (SDL_Surface *src, SDL_PixelFormat *fmt, Uint32 flags);
  625.  
  626. /*
  627.  * This performs a fast blit from the source surface to the destination
  628.  * surface.  It assumes that the source and destination rectangles are
  629.  * the same size.  If either 'srcrect' or 'dstrect' are NULL, the entire
  630.  * surface (src or dst) is copied.  The final blit rectangles are saved
  631.  * in 'srcrect' and 'dstrect' after all clipping is performed.
  632.  * If the blit is successful, it returns 0, otherwise it returns -1.
  633.  *
  634.  * The blit function should not be called on a locked surface.
  635.  *
  636.  * The blit semantics for surfaces with and without alpha and colorkey
  637.  * are defined as follows:
  638.  *
  639.  * RGBA->RGB:
  640.  *     SDL_SRCALPHA set:
  641.  *      alpha-blend (using alpha-channel).
  642.  *      SDL_SRCCOLORKEY ignored.
  643.  *     SDL_SRCALPHA not set:
  644.  *      copy RGB.
  645.  *      if SDL_SRCCOLORKEY set, only copy the pixels matching the
  646.  *      RGB values of the source colour key, ignoring alpha in the
  647.  *      comparison.
  648.  *
  649.  * RGB->RGBA:
  650.  *     SDL_SRCALPHA set:
  651.  *      alpha-blend (using the source per-surface alpha value);
  652.  *      set destination alpha to opaque.
  653.  *     SDL_SRCALPHA not set:
  654.  *      copy RGB, set destination alpha to source per-surface alpha value.
  655.  *     both:
  656.  *      if SDL_SRCCOLORKEY set, only copy the pixels matching the
  657.  *      source colour key.
  658.  *
  659.  * RGBA->RGBA:
  660.  *     SDL_SRCALPHA set:
  661.  *      alpha-blend (using the source alpha channel) the RGB values;
  662.  *      leave destination alpha untouched. [Note: is this correct?]
  663.  *      SDL_SRCCOLORKEY ignored.
  664.  *     SDL_SRCALPHA not set:
  665.  *      copy all of RGBA to the destination.
  666.  *      if SDL_SRCCOLORKEY set, only copy the pixels matching the
  667.  *      RGB values of the source colour key, ignoring alpha in the
  668.  *      comparison.
  669.  *
  670.  * RGB->RGB:
  671.  *     SDL_SRCALPHA set:
  672.  *      alpha-blend (using the source per-surface alpha value).
  673.  *     SDL_SRCALPHA not set:
  674.  *      copy RGB.
  675.  *     both:
  676.  *      if SDL_SRCCOLORKEY set, only copy the pixels matching the
  677.  *      source colour key.
  678.  *
  679.  * If either of the surfaces were in video memory, and the blit returns -2,
  680.  * the video memory was lost, so it should be reloaded with artwork and
  681.  * re-blitted:
  682.         while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
  683.                 while ( SDL_LockSurface(image) < 0 )
  684.                         Sleep(10);
  685.                 -- Write image pixels to image->pixels --
  686.                 SDL_UnlockSurface(image);
  687.         }
  688.  * This happens under DirectX 5.0 when the system switches away from your
  689.  * fullscreen application.  The lock will also fail until you have access
  690.  * to the video memory again.
  691.  */
  692. /* You should call SDL_BlitSurface() unless you know exactly how SDL
  693.    blitting works internally and how to use the other blit functions.
  694. */
  695. #define SDL_BlitSurface SDL_UpperBlit
  696.  
  697. /* This is the public blit function, SDL_BlitSurface(), and it performs
  698.    rectangle validation and clipping before passing it to SDL_LowerBlit()
  699. */
  700. extern DECLSPEC int SDLCALL SDL_UpperBlit
  701.                         (SDL_Surface *src, SDL_Rect *srcrect,
  702.                          SDL_Surface *dst, SDL_Rect *dstrect);
  703. /* This is a semi-private blit function and it performs low-level surface
  704.    blitting only.
  705. */
  706. extern DECLSPEC int SDLCALL SDL_LowerBlit
  707.                         (SDL_Surface *src, SDL_Rect *srcrect,
  708.                          SDL_Surface *dst, SDL_Rect *dstrect);
  709.  
  710. /*
  711.  * This function performs a fast fill of the given rectangle with 'color'
  712.  * The given rectangle is clipped to the destination surface clip area
  713.  * and the final fill rectangle is saved in the passed in pointer.
  714.  * If 'dstrect' is NULL, the whole surface will be filled with 'color'
  715.  * The color should be a pixel of the format used by the surface, and
  716.  * can be generated by the SDL_MapRGB() function.
  717.  * This function returns 0 on success, or -1 on error.
  718.  */
  719. extern DECLSPEC int SDLCALL SDL_FillRect
  720.                 (SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color);
  721.  
  722. /*
  723.  * This function takes a surface and copies it to a new surface of the
  724.  * pixel format and colors of the video framebuffer, suitable for fast
  725.  * blitting onto the display surface.  It calls SDL_ConvertSurface()
  726.  *
  727.  * If you want to take advantage of hardware colorkey or alpha blit
  728.  * acceleration, you should set the colorkey and alpha value before
  729.  * calling this function.
  730.  *
  731.  * If the conversion fails or runs out of memory, it returns NULL
  732.  */
  733. extern DECLSPEC SDL_Surface * SDLCALL SDL_DisplayFormat(SDL_Surface *surface);
  734.  
  735. /*
  736.  * This function takes a surface and copies it to a new surface of the
  737.  * pixel format and colors of the video framebuffer (if possible),
  738.  * suitable for fast alpha blitting onto the display surface.
  739.  * The new surface will always have an alpha channel.
  740.  *
  741.  * If you want to take advantage of hardware colorkey or alpha blit
  742.  * acceleration, you should set the colorkey and alpha value before
  743.  * calling this function.
  744.  *
  745.  * If the conversion fails or runs out of memory, it returns NULL
  746.  */
  747. extern DECLSPEC SDL_Surface * SDLCALL SDL_DisplayFormatAlpha(SDL_Surface *surface);
  748.  
  749.  
  750. /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  751. /* YUV video surface overlay functions                                       */
  752. /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  753.  
  754. /* This function creates a video output overlay
  755.    Calling the returned surface an overlay is something of a misnomer because
  756.    the contents of the display surface underneath the area where the overlay
  757.    is shown is undefined - it may be overwritten with the converted YUV data.
  758. */
  759. extern DECLSPEC SDL_Overlay * SDLCALL SDL_CreateYUVOverlay(int width, int height,
  760.                                 Uint32 format, SDL_Surface *display);
  761.  
  762. /* Lock an overlay for direct access, and unlock it when you are done */
  763. extern DECLSPEC int SDLCALL SDL_LockYUVOverlay(SDL_Overlay *overlay);
  764. extern DECLSPEC void SDLCALL SDL_UnlockYUVOverlay(SDL_Overlay *overlay);
  765.  
  766. /* Blit a video overlay to the display surface.
  767.    The contents of the video surface underneath the blit destination are
  768.    not defined.  
  769.    The width and height of the destination rectangle may be different from
  770.    that of the overlay, but currently only 2x scaling is supported.
  771. */
  772. extern DECLSPEC int SDLCALL SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect);
  773.  
  774. /* Free a video overlay */
  775. extern DECLSPEC void SDLCALL SDL_FreeYUVOverlay(SDL_Overlay *overlay);
  776.  
  777.  
  778. /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  779. /* OpenGL support functions.                                                 */
  780. /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  781.  
  782. /*
  783.  * Dynamically load a GL driver, if SDL is built with dynamic GL.
  784.  *
  785.  * SDL links normally with the OpenGL library on your system by default,
  786.  * but you can compile it to dynamically load the GL driver at runtime.
  787.  * If you do this, you need to retrieve all of the GL functions used in
  788.  * your program from the dynamic library using SDL_GL_GetProcAddress().
  789.  *
  790.  * This is disabled in default builds of SDL.
  791.  */
  792. extern DECLSPEC int SDLCALL SDL_GL_LoadLibrary(const char *path);
  793.  
  794. /*
  795.  * Get the address of a GL function (for extension functions)
  796.  */
  797. extern DECLSPEC void * SDLCALL SDL_GL_GetProcAddress(const char* proc);
  798.  
  799. /*
  800.  * Set an attribute of the OpenGL subsystem before intialization.
  801.  */
  802. extern DECLSPEC int SDLCALL SDL_GL_SetAttribute(SDL_GLattr attr, int value);
  803.  
  804. /*
  805.  * Get an attribute of the OpenGL subsystem from the windowing
  806.  * interface, such as glX. This is of course different from getting
  807.  * the values from SDL's internal OpenGL subsystem, which only
  808.  * stores the values you request before initialization.
  809.  *
  810.  * Developers should track the values they pass into SDL_GL_SetAttribute
  811.  * themselves if they want to retrieve these values.
  812.  */
  813. extern DECLSPEC int SDLCALL SDL_GL_GetAttribute(SDL_GLattr attr, int* value);
  814.  
  815. /*
  816.  * Swap the OpenGL buffers, if double-buffering is supported.
  817.  */
  818. extern DECLSPEC void SDLCALL SDL_GL_SwapBuffers(void);
  819.  
  820. /*
  821.  * Internal functions that should not be called unless you have read
  822.  * and understood the source code for these functions.
  823.  */
  824. extern DECLSPEC void SDLCALL SDL_GL_UpdateRects(int numrects, SDL_Rect* rects);
  825. extern DECLSPEC void SDLCALL SDL_GL_Lock(void);
  826. extern DECLSPEC void SDLCALL SDL_GL_Unlock(void);
  827.  
  828. /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  829. /* These functions allow interaction with the window manager, if any.        */
  830. /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  831.  
  832. /*
  833.  * Sets/Gets the title and icon text of the display window
  834.  */
  835. extern DECLSPEC void SDLCALL SDL_WM_SetCaption(const char *title, const char *icon);
  836. extern DECLSPEC void SDLCALL SDL_WM_GetCaption(char **title, char **icon);
  837.  
  838. /*
  839.  * Sets the icon for the display window.
  840.  * This function must be called before the first call to SDL_SetVideoMode().
  841.  * It takes an icon surface, and a mask in MSB format.
  842.  * If 'mask' is NULL, the entire icon surface will be used as the icon.
  843.  */
  844. extern DECLSPEC void SDLCALL SDL_WM_SetIcon(SDL_Surface *icon, Uint8 *mask);
  845.  
  846. /*
  847.  * This function iconifies the window, and returns 1 if it succeeded.
  848.  * If the function succeeds, it generates an SDL_APPACTIVE loss event.
  849.  * This function is a noop and returns 0 in non-windowed environments.
  850.  */
  851. extern DECLSPEC int SDLCALL SDL_WM_IconifyWindow(void);
  852.  
  853. /*
  854.  * Toggle fullscreen mode without changing the contents of the screen.
  855.  * If the display surface does not require locking before accessing
  856.  * the pixel information, then the memory pointers will not change.
  857.  *
  858.  * If this function was able to toggle fullscreen mode (change from
  859.  * running in a window to fullscreen, or vice-versa), it will return 1.
  860.  * If it is not implemented, or fails, it returns 0.
  861.  *
  862.  * The next call to SDL_SetVideoMode() will set the mode fullscreen
  863.  * attribute based on the flags parameter - if SDL_FULLSCREEN is not
  864.  * set, then the display will be windowed by default where supported.
  865.  *
  866.  * This is currently only implemented in the X11 video driver.
  867.  */
  868. extern DECLSPEC int SDLCALL SDL_WM_ToggleFullScreen(SDL_Surface *surface);
  869.  
  870. /*
  871.  * This function allows you to set and query the input grab state of
  872.  * the application.  It returns the new input grab state.
  873.  */
  874. typedef enum {
  875.         SDL_GRAB_QUERY = -1,
  876.         SDL_GRAB_OFF = 0,
  877.         SDL_GRAB_ON = 1,
  878.         SDL_GRAB_FULLSCREEN     /* Used internally */
  879. } SDL_GrabMode;
  880. /*
  881.  * Grabbing means that the mouse is confined to the application window,
  882.  * and nearly all keyboard input is passed directly to the application,
  883.  * and not interpreted by a window manager, if any.
  884.  */
  885. extern DECLSPEC SDL_GrabMode SDLCALL SDL_WM_GrabInput(SDL_GrabMode mode);
  886.  
  887. /* Not in public API at the moment - do not use! */
  888. extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
  889.                                     SDL_Surface *dst, SDL_Rect *dstrect);
  890.                    
  891. /* Ends C function definitions when using C++ */
  892. #ifdef __cplusplus
  893. }
  894. #endif
  895. #include "close_code.h"
  896.  
  897. #endif /* _SDL_video_h */
  898.