sdl_video.h

视频音频编码程序 视频音频编码程序 视频音频编码程序

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    [e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_video.h,v 1.4 2002/04/22 21:38:01 wmay Exp $";
#endif

/* Header file for access to the SDL raw framebuffer window */

#ifndef _SDL_video_h
#define _SDL_video_h

#include <stdio.h>

#include "SDL_types.h"
#include "SDL_mutex.h"
#include "SDL_rwops.h"

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

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

/* Useful data types */
typedef struct {
	Sint16 x, y;
	Uint16 w, h;
} SDL_Rect;

typedef struct {
	Uint8 r;
	Uint8 g;
	Uint8 b;
	Uint8 unused;
} SDL_Color;

typedef struct {
	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;

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

/* 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;

/* 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))


/* Useful for determining the video hardware capabilities */
typedef struct {
	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 */
} SDL_VideoInfo;


/* 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 */

	/* Hardware-specific surface info */
	struct private_yuvhwfuncs *hwfuncs;
	struct private_yuvhwdata *hwdata;

	/* 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_GLattr;

/* flags for SDL_SetPalette() */
#define SDL_LOGPAL 0x01
#define SDL_PHYSPAL 0x02

/* Function prototypes */

/* 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().
 *
 * SDL_VideoInit() 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.
 *