#include “sdl.h”#include 
     
      SDL_Window* sdlwindow=NULL;const int SCREEN_WIDTH=640;const int SCREEN_HEIGHT=480;SDL_Surface* g_pDisplaySurface = NULL;SDL_Event g_Event;SDL_Rect g_Rect;Uint8 g_Red, g_Green, g_Blue;Uint32 g_Color;int main(int argc, char* argv[]){    SDL_Init(SDL_INIT_VIDEO);    atexit(SDL_Quit);    sdlwindow=SDL_CreateWindow("title",        SDL_WINDOWPOS_CENTERED,        SDL_WINDOWPOS_CENTERED,        SCREEN_WIDTH,        SCREEN_HEIGHT,        SDL_WINDOW_SHOWN|SDL_WINDOW_BORDERLESS//无边框    );    g_pDisplaySurface = SDL_GetWindowSurface(sdlwindow);        for(;;)    {        if(SDL_PollEvent(&g_Event)==0)        {            g_Red=rand()%256;            g_Green=rand()%256;            g_Blue=rand()%256;            g_Color=SDL_MapRGB(g_pDisplaySurface-            >format,g_Red,g_Green,g_Blue);            g_Rect.x=rand()%SCREEN_WIDTH;            g_Rect.y=rand()%SCREEN_HEIGHT;            g_Rect.w=rand()%(SCREEN_WIDTH-g_Rect.x);            g_Rect.h=rand()%(SCREEN_HEIGHT-g_Rect.y);            SDL_FillRect(g_pDisplaySurface,&g_Rect,g_Color);            SDL_UpdateRect(g_pDisplaySurface,0,0,0,0);        }        else        {            if(g_Event.type==SDL_QUIT) break;        }    }    return(0);}