SDL_Render屏幕分辨率适配和拉伸

/**
*   SDL2暴力缩放用作屏幕分辨率适配
*   1:以逻辑分辨率绘图,比如240*480
*   2:以物理分辨率显示(在电脑上是窗口分辨率;在安卓上是屏幕分辨率)
*   3:要做ui的话需要   鼠标或者触摸点的坐标 换算到 逻辑坐标
*/
#include <SDL2/SDL.h>
int main(int argc,char *argv[])
{
    //初始化sdl
    SDL_Init(SDL_INIT_VIDEO);
    //创建窗口和物理分辨率
    SDL_Window *windows1 = SDL_CreateWindow("render",100,100,480,800,SDL_WINDOW_SHOWN);
    //创建基于窗口的渲染器
    SDL_Renderer *windows1_render = SDL_CreateRenderer(windows1,-1,SDL_RENDERER_ACCELERATED);
    //设置渲染器的逻辑分辨率
    SDL_RenderSetLogicalSize(windows1_render,240,400);
    //设置渲染器绘图颜色
    SDL_SetRenderDrawColor(windows1_render,255,0,0,200);
    //渲染器绘制线段
    SDL_RenderDrawLine(windows1_render,0,0,240,400);
    //在窗口上呈现渲染器
    SDL_RenderPresent(windows1_render);
    //延时2s
    SDL_Delay(3000);
    //销毁渲染器
    SDL_DestroyRenderer(windows1_render);
    //销毁窗口
    SDL_DestroyWindow(windows1);
    //退出sdl
    SDL_Quit();
    //结束程序
    return 0;
}