怎么在C#中利用SDL2实现一个视频播放窗口截图-创新互联

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具体方法如下

 /// 

 /// SDL2截图操作类
 /// 
 public unsafe class SDLScreenshot
 {
  IntPtr window;// 窗口对象
  IntPtr renderer;// 播放窗口的渲染器（来自于已初始化的播放窗口渲染器） 
  public SDLScreenshot(IntPtr window, IntPtr renderer)
  {
   this.window = window;
   this.renderer = renderer;
  } 
  /// 

  /// 保存截图
  /// 
  /// 
  /// 
  /// 
  public void SaveBMP(int width, int height,string path)
  {
   // 判断渲染器是否初始化
   if (renderer == IntPtr.Zero)
   {
    Console.WriteLine("renderer is null ,please call Init() method.");
    return;
   }
   uint Rmask=0x00FF0000, Gmask = 0x0000FF00, Bmask = 0x000000FF, Amask = 0x00000000;
   // 获取图像数据
   SDL.SDL_Surface* surface= (SDL.SDL_Surface*)SDL.SDL_CreateRGBSurface(0, width, height, 32, Rmask, Gmask, Bmask, Amask);
   //设置纹理的数据
   SDL.SDL_Rect destrect;
   destrect.x = 0;
   destrect.y = 0;
   destrect.w = width;
   destrect.h = height; 
 
   // 读取并渲染图像数据
   SDL.SDL_RenderReadPixels(renderer, ref destrect, SDL.SDL_PIXELFORMAT_ARGB8888, surface->pixels, surface->pitch); 
 
   //保存图片
   int i = SDL.SDL_SaveBMP((IntPtr)surface, path);
   if (i != 0)
   {
    Console.WriteLine("screenshot failed." + SDL.SDL_GetError());
   } 
 
   SDL.SDL_FreeSurface((IntPtr)surface);
   //SDL.SDL_RenderClear(renderer);
   //SDL.SDL_DestroyRenderer(renderer); 
  } 
 
  /// 

  /// 加载截图
  /// 
  /// 
  /// 
  /// 
  public void LoadBMP(int width, int height, string path)
  {
   // 判断渲染器是否初始化
   if (renderer == IntPtr.Zero)
   {
    Console.WriteLine("renderer is null ,please call Init() method.");
    return;
   }
   // 加载图片
   IntPtr surface = SDL.SDL_LoadBMP(path);
   if (surface == IntPtr.Zero)
   {
    Console.WriteLine("load bmp failed." + SDL.SDL_GetError());
    return;
   }
   IntPtr texture = SDL.SDL_CreateTextureFromSurface(renderer, surface);
   if (texture == IntPtr.Zero)
   {
    Console.WriteLine("create texture failed." + SDL.SDL_GetError());
    return;
   }
   SDL.SDL_FreeSurface(surface); 
 
   //设置纹理的数据
   SDL.SDL_Rect destrect;
   destrect.x = 0;
   destrect.y = 0;
   destrect.w = width;
   destrect.h = height; 
 
   SDL.SDL_Rect srcrect = destrect; 
 
   //SDL.SDL_RenderClear(renderer);
   SDL.SDL_RenderCopy(renderer, texture, ref srcrect, ref destrect);
   SDL.SDL_RenderPresent(renderer);
 
 
   //SDL.SDL_Delay(20); 
   SDL.SDL_DestroyTexture(texture);
   //SDL.SDL_DestroyRenderer(renderer);
   //SDL.SDL_DestroyWindow(screen);
   //Quit SDL 
   //SDL.SDL_Quit();
  }
 }

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