在SDL中使sprite背景透明

#include <SDL.h>

int main(int argc, char* argv[]) {
    // 初始化SDL
    SDL_Init(SDL_INIT_VIDEO);

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

    // 加载sprite图像
    SDL_Surface* spriteSurface = SDL_LoadBMP("sprite.bmp");

    // 设置透明色
    Uint32 transparentColor = SDL_MapRGB(spriteSurface->format, 255, 0, 255);
    SDL_SetColorKey(spriteSurface, SDL_TRUE, transparentColor);

    // 创建纹理并渲染sprite
    SDL_Texture* spriteTexture = SDL_CreateTextureFromSurface(renderer, spriteSurface);
    SDL_RenderCopy(renderer, spriteTexture, NULL, NULL);
    SDL_RenderPresent(renderer);

    // 处理事件循环
    bool quit = false;
    SDL_Event event;
    while (!quit) {
        while (SDL_PollEvent(&event)) {
            if (event.type == SDL_QUIT) {
                quit = true;
            }
        }
    }

    // 清理资源
    SDL_DestroyTexture(spriteTexture);
    SDL_FreeSurface(spriteSurface);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}