如何在SDL2中读/写SDL_Surface中的像素？

#include <SDL2/SDL.h>

int main() {
    SDL_Init(SDL_INIT_VIDEO);

    SDL_Surface* surface = SDL_LoadBMP("image.bmp");
    SDL_LockSurface(surface);

    Uint32* pixels = (Uint32*)surface->pixels;
    int width = surface->w;
    int height = surface->h;

    // 读取像素
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            Uint32 pixel = pixels[y * width + x];
            // 处理像素数据
        }
    }

    // 写入像素
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            Uint32 pixel = 0xFF0000FF; // 示例：设置像素为红色
            pixels[y * width + x] = pixel;
        }
    }

    SDL_UnlockSurface(surface);

    SDL_SaveBMP(surface, "modified_image.bmp");
    SDL_FreeSurface(surface);

    SDL_Quit();

    return 0;
}