在SDL中查找屏幕上的平均颜色

#include <SDL2/SDL.h>

int main() {
    // 初始化SDL库
    SDL_Init(SDL_INIT_VIDEO);

    // 创建窗口和渲染器
    SDL_Window* window = SDL_CreateWindow("SDL Example", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, 0);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);

    // 获取屏幕表面
    SDL_Surface* screenSurface = SDL_GetWindowSurface(window);

    // 锁定屏幕表面
    SDL_LockSurface(screenSurface);

    // 获取屏幕表面数据
    Uint32* pixels = (Uint32*)screenSurface->pixels;
    int pixelCount = screenSurface->w * screenSurface->h;
    Uint32 redSum = 0;
    Uint32 greenSum = 0;
    Uint32 blueSum = 0;

    for (int i = 0; i < pixelCount; i++) {
        Uint8 red, green, blue, alpha;
        SDL_GetRGBA(pixels[i], screenSurface->format, &red, &green, &blue, &alpha);

        redSum += red;
        greenSum += green;
        blueSum += blue;
    }

    // 计算平均颜色
    Uint8 redAvg = redSum / pixelCount;
    Uint8 greenAvg = greenSum / pixelCount;
    Uint8 blueAvg = blueSum / pixelCount;

    // 解锁屏幕表面
    SDL_UnlockSurface(screenSurface);

    // 输出平均颜色
    printf("Average Color: R=%d, G=%d, B=%d\n", redAvg, greenAvg, blueAvg);

    // 清理SDL资源
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}