C语言显示jpg图片，正常的代码

以下是一份使用 SDL_image 库加载和显示 JPG 图片的 C 语言代码：

#include <stdio.h>
#include <stdlib.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>

int main(int argc, char *argv[])
{
    // 初始化 SDL2
    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
        fprintf(stderr, "Failed to initialize SDL2: %s\n", SDL_GetError());
        return 1;
    }

    // 初始化 SDL_image
    if ((IMG_Init(IMG_INIT_JPG) & IMG_INIT_JPG) != IMG_INIT_JPG) {
        fprintf(stderr, "Failed to initialize SDL_image: %s\n", IMG_GetError());
        SDL_Quit();
        return 1;
    }

    // 加载 JPG 图片
    SDL_Surface *image_surface = IMG_Load("test.jpg");
    if (!image_surface) {
        fprintf(stderr, "Failed to load image: %s\n", IMG_GetError());
        IMG_Quit();
        SDL_Quit();
        return 1;
    }

    // 创建窗口和渲染器
    SDL_Window *window = SDL_CreateWindow("JPG Image Viewer",
                                          SDL_WINDOWPOS_UNDEFINED,
                                          SDL_WINDOWPOS_UNDEFINED,
                                          image_surface->w,
                                          image_surface->h,
                                          SDL_WINDOW_SHOWN);
    if (!window) {
        fprintf(stderr, "Failed to create window: %s\n", SDL_GetError());
        SDL_FreeSurface(image_surface);
        IMG_Quit();
        SDL_Quit();
        return 1;
    }

    SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
    if (!renderer) {
        fprintf(stderr, "Failed to create renderer: %s\n", SDL_GetError());
        SDL_DestroyWindow(window);
        SDL_FreeSurface(image_surface);
        IMG_Quit();
        SDL_Quit();
        return 1;
    }

    // 将图像渲染到屏幕上
    SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, image_surface);
    if (!texture) {
        fprintf(stderr, "Failed to create texture: %s\n", SDL_GetError());
        SDL_DestroyRenderer(renderer);
        SDL_DestroyWindow(window);
        SDL_FreeSurface(image_surface);
        IMG_Quit();
        SDL_Quit();
        return 1;
    }

    SDL_RenderCopy(renderer, texture, NULL, NULL);
    SDL_RenderPresent(renderer);

    // 等待窗口关闭
    SDL_Event event;
    while (1) {
        if (SDL_WaitEvent(&event) != 0 && event.type == SDL_QUIT)
            break;
    }

    // 释放资源
    SDL_DestroyTexture(texture);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_FreeSurface(image_surface);
    IMG_Quit();
    SDL_Quit();

    return 0;
}

这个代码使用了 SDL2 和 SDL_image 库来加载和显示 JPG 图片。它通过使用 SDL_CreateWindow() 和 SDL_CreateRenderer() 创建了一个窗口和一个渲染器，并使用 SDL_CreateTextureFromSurface() 将图像渲染到屏幕上。最后，它使用 SDL_WaitEvent() 等待窗口关闭事件，然后释放了所有使用的资源。