#include <iostream>
#include "SDL2/SDL.h"
#include "SDL2_image/SDL_image.h"
#include "demo_sdl.h"

using namespace std;
const int WIDTH = 1000;
const int HEIGHT = 600;

void showImage() {
    if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
        cout << "初始化失败" << endl;
        return;
    }
    SDL_Window *window = SDL_CreateWindow("Show Image", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, WIDTH, HEIGHT,
                                          SDL_WINDOW_SHOWN);
    if (window == nullptr) {
        cout << "创建Window失败：" << SDL_GetError() << endl;
        return;
    }
    SDL_Renderer *renderer = SDL_CreateRenderer(window, 0, SDL_RENDERER_ACCELERATED);
    if (renderer == nullptr) {
        cout << "创建Renderer失败：" << SDL_GetError() << endl;
        return;
    }
    SDL_Surface *image = IMG_Load("/Volumes/T5/CppPractice/renderer-dog/res/demo.jpg");
    if (!image) {
        cout << "加载图片失败：" << SDL_GetError() << endl;
        return;
    }    // 如果使用硬件加速，则必须将Surface转换成Texture    
    SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, image);
    SDL_FreeSurface(image);
    SDL_RenderClear(renderer);
    SDL_RenderCopy(renderer, texture, nullptr, nullptr);
    SDL_RenderPresent(renderer);
    SDL_Event windowEvent;
    while (true) {
        if (SDL_PollEvent(&windowEvent)) {
            if (windowEvent.type == SDL_QUIT) {
                std::cout << "终止程序" << std::endl;
                break;
            }
        }
    }
    SDL_DestroyRenderer(renderer);
    SDL_DestroyTexture(texture);
    SDL_DestroyWindow(window);
    SDL_Quit();
}

基本步骤

1. 初始化

2. 创建Window

3. 创建Renderer,用于在Window上渲染内容

4. 创建Surface,Surface其实就是像素的载体

5. 如果需要使用硬件加速,需要将Surface转换成Texture

6. 清除Renderer内容,并使用Renderer的Copy功能将texture内容复制到屏幕的指定区域

7. 指定当前的Renderer.

8. 事件监听

9. 销毁各种对象

遇到的问题

• MacOS安装的SDL2_image库打开时提示安全提示
解决方案:

sudo spctl --master-disable

源码