1、利用了第三课的代码先显示了image.png图片的原始大小，运行结果如图。
4、代码：#include<SDL2/SDL.h>#include<SDL2/SDL_imag髫潋啜缅e.h>intmain(intargc,char**argv){SDL_Init(SDL_INIT_VIDEO);SDL_Window*window=SDL_CreateWindow("texture的截减和缩放",SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,720,1280,SDL_WINDOW_SHOWN);SDL_Renderer*renderer=SDL_CreateRenderer(window,-1,SDL_RENDERER_ACCELERATED);SDL_RenderClear(renderer);SDL_Surface*surface=IMG_Load("./resource/image.png");SDL_Rectbox={0,0,surface->w*2,surface->h*2};SDL_Texture*texture=SDL_CreateTextureFromSurface(renderer,surface);SDL_RenderCopy(renderer,texture,NULL,&box);SDL_RenderPresent(renderer);SDL_Delay(6000);SDL_FreeSurface(surface);SDL_DestroyTexture(texture);SDL_DestroyRenderer(renderer);SDL_DestroyWindow(window);SDL_Quit();}
