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;
20 flags Surface flags
20 format Pixel format
20 w, h Width and height of the surface
20 pitch Length of a surface scanline in bytes
20 pixels Pointer to the actual pixel data
20 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.
20 SDL_SWSURFACE Surface is stored in system memory
20 SDL_HWSURFACE Surface is stored in video memory
20 SDL_ASYNCBLIT Surface uses asynchronous blits if possible
20 SDL_ANYFORMAT Allows any pixel-format (Display surface)
20 SDL_HWPALETTE Surface has exclusive palette
20 SDL_DOUBLEBUF Surface is double buffered (Display surface)
20 SDL_FULLSCREEN Surface is full screen (Display Surface)
20 SDL_OPENGL Surface has an OpenGL context (Display Surface)
20 SDL_OPENGLBLIT Surface supports OpenGL blitting (Display Surface)
20 SDL_RESIZABLE Surface is resizable (Display Surface)
20 SDL_HWACCEL Surface blit uses hardware acceleration
20 SDL_SRCCOLORKEY Surface use colorkey blitting
20 SDL_RLEACCEL Colorkey blitting is accelerated with RLE
20 SDL_SRCALPHA Surface blit uses alpha blending
20 SDL_PREALLOC Surface uses preallocated memory
SDL_PixelFormat
created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01
