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Man Pages
SDL_Surface(3) SDL API Reference SDL_Surface(3)

SDL_Surface - Graphical Surface Structure

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 */
/* clipping information */ SDL_Rect clip_rect; /* Read-only */
/* Reference count -- used when freeing surface */ int refcount; /* Read-mostly */
/* This structure also contains private fields not shown here */ } SDL_Surface;

flags
Surface flags
format
Pixel format
w, h
Width and height of the surface
pitch
Length of a surface scanline in bytes
pixels
Pointer to the actual pixel data
clip_rect
surface clip rectangle

SDL_Surface's represent areas of "graphical" memory, memory that can be drawn to. The video framebuffer is returned as a SDL_Surface by SDL_SetVideoMode and SDL_GetVideoSurface . Most of the fields should be pretty obvious. w and h are the width and height of the surface in pixels. pixels is a pointer to the actual pixel data, the surface should be locked before accessing this field. The clip_rect field is the clipping rectangle as set by SDL_SetClipRect.
The following are supported in the flags field.
SDL_SWSURFACE
Surface is stored in system memory
SDL_HWSURFACE
Surface is stored in video memory
SDL_ASYNCBLIT
Surface uses asynchronous blits if possible
SDL_ANYFORMAT
Allows any pixel-format (Display surface)
SDL_HWPALETTE
Surface has exclusive palette
SDL_DOUBLEBUF
Surface is double buffered (Display surface)
SDL_FULLSCREEN
Surface is full screen (Display Surface)
SDL_OPENGL
Surface has an OpenGL context (Display Surface)
SDL_OPENGLBLIT
Surface supports OpenGL blitting (Display Surface)
SDL_RESIZABLE
Surface is resizable (Display Surface)
SDL_HWACCEL
Surface blit uses hardware acceleration
SDL_SRCCOLORKEY
Surface use colorkey blitting
SDL_RLEACCEL
Colorkey blitting is accelerated with RLE
SDL_SRCALPHA
Surface blit uses alpha blending
SDL_PREALLOC
Surface uses preallocated memory

SDL_PixelFormat
Tue 11 Sep 2001, 23:01 SDL

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