SDL_GetClipRect (3) - Linux Manuals
SDL_GetClipRect: Gets the clipping rectangle for a surface.
NAME
SDL_GetClipRect - Gets the clipping rectangle for a surface.SYNOPSIS
#include "SDL.h"
void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect);
DESCRIPTION
Gets the clipping rectangle for a surface. When this surface is the destination of a blit, only the area within the clip rectangle is drawn into.
The rectangle pointed to by rect will be filled with the clipping rectangle of the surface.
SEE ALSO
SDL_SetClipRect, SDL_BlitSurface, SDL_Surface