c++ - 如何在 SDL 2 中获取并保存 BMP 屏幕截图？

Question

仅使用给定的 SDL_Window* 和 SDL_Renderer*，我如何在 SDL 2.0 中创建和保存屏幕截图？

Answer 1

下面是一个将屏幕截图保存在 SDL 2 中的函数，该屏幕截图取 self 目前正在编写的库。

bool saveScreenshotBMP(std::string filepath, SDL_Window* SDLWindow, SDL_Renderer* SDLRenderer) {
    SDL_Surface* saveSurface = NULL;
    SDL_Surface* infoSurface = NULL;
    infoSurface = SDL_GetWindowSurface(SDLWindow);
    if (infoSurface == NULL) {
        std::cerr << "Failed to create info surface from window in saveScreenshotBMP(string), SDL_GetError() - " << SDL_GetError() << "\n";
    } else {
        unsigned char * pixels = new (std::nothrow) unsigned char[infoSurface->w * infoSurface->h * infoSurface->format->BytesPerPixel];
        if (pixels == 0) {
            std::cerr << "Unable to allocate memory for screenshot pixel data buffer!\n";
            return false;
        } else {
            if (SDL_RenderReadPixels(SDLRenderer, &infoSurface->clip_rect, infoSurface->format->format, pixels, infoSurface->w * infoSurface->format->BytesPerPixel) != 0) {
                std::cerr << "Failed to read pixel data from SDL_Renderer object. SDL_GetError() - " << SDL_GetError() << "\n";
                delete[] pixels;
                return false;
            } else {
                saveSurface = SDL_CreateRGBSurfaceFrom(pixels, infoSurface->w, infoSurface->h, infoSurface->format->BitsPerPixel, infoSurface->w * infoSurface->format->BytesPerPixel, infoSurface->format->Rmask, infoSurface->format->Gmask, infoSurface->format->Bmask, infoSurface->format->Amask);
                if (saveSurface == NULL) {
                    std::cerr << "Couldn't create SDL_Surface from renderer pixel data. SDL_GetError() - " << SDL_GetError() << "\n";
                    delete[] pixels;
                    return false;
                }
                SDL_SaveBMP(saveSurface, filepath.c_str());
                SDL_FreeSurface(saveSurface);
                saveSurface = NULL;
            }
            delete[] pixels;
        }
        SDL_FreeSurface(infoSurface);
        infoSurface = NULL;
    }
    return true;
}

干杯!-尼尔