Mac OSX上的SDL 1.2 SDL_FillRect

Question

我想在Xcode中的Mac OS X上使用SDL 1.2。 创建窗口时没有任何问题：

#include <SDL/SDL.h>

void pause()
{
    int continuer = 1;
    SDL_Event event;

    while (continuer)
    {
        SDL_WaitEvent(&event);
        switch(event.type)
        {
            case SDL_QUIT:
                continuer = 0;
        }
    }
}

int main(int argc, char *argv[])
{
    SDL_Surface *ecran = NULL;

    SDL_Init(SDL_INIT_VIDEO);

    ecran = SDL_SetVideoMode(640, 480, 32, SDL_HWSURFACE);
    if (ecran == NULL)
    {
        fprintf(stderr, "Impossible de charger le mode vidéo : %s\n", SDL_GetError());
        exit(EXIT_FAILURE);
    }
    SDL_WM_SetCaption("Ma super fenêtre SDL !", NULL);

    pause();

    SDL_Quit();

    return EXIT_SUCCESS;
}

但是当我尝试在窗口上添加颜色或图像时，没有任何反应。窗口保持灰色。

#include <SDL/SDL.h>

void pause()
{
    int continuer = 1;
    SDL_Event event;

    while (continuer)
    {
        SDL_WaitEvent(&event);
        switch(event.type)
        {
            case SDL_QUIT:
                continuer = 0;
        }
    }
}

int main(int argc, char *argv[])
{
    SDL_Surface *ecran = NULL;

    SDL_Init(SDL_INIT_VIDEO);

    ecran = SDL_SetVideoMode(640, 480, 32, SDL_HWSURFACE);
    if (ecran == NULL)
    {
        fprintf(stderr, "Impossible de charger le mode vidéo : %s\n", SDL_GetError());
        exit(EXIT_FAILURE);

    }
    SDL_WM_SetCaption("Ma super fenêtre SDL !", NULL);
    SDL_FillRect(ecran, NULL, SDL_MapRGB(ecran->format, 17, 206, 112));

    SDL_Flip(ecran);
    pause();

    SDL_Quit();

    return EXIT_SUCCESS;
}

提前感谢您的帮助。