SDL_SaveBMP (3) - Linux Manuals
SDL_SaveBMP: Save an SDL_Surface as a Windows BMP file.
NAME
SDL_SaveBMP - Save an SDL_Surface as a Windows BMP file.SYNOPSIS
#include "SDL.h"
int SDL_SaveBMP(SDL_Surface *surface, const char *file);
DESCRIPTION
Saves the SDL_Surface surface as a Windows BMP file named file.
RETURN VALUE
Returns 0 if successful or -1 if there was an error.
SEE ALSO
SDL_LoadBMP