改成显示1024位的jpg图片
时间: 2023-09-11 22:08:36 浏览: 61
要显示1024位的 JPG 图片,需要先使用一个 JPG 解码库将其解码为 RGB 格式的图像数据,然后再使用一个图像显示库将其显示出来。以下是一个示例代码,使用了 libjpeg 和 SDL2 两个库:
```c
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <jpeglib.h>
#include <SDL.h>
int main(int argc, char *argv[]) {
if (argc < 2) {
printf("Usage: %s <input.jpg>\n", argv[0]);
return 0;
}
char *filename = argv[1];
FILE *file = fopen(filename, "rb");
if (file == NULL) {
printf("Failed to open file: %s\n", filename);
return 1;
}
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, file);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
uint32_t width = cinfo.output_width;
uint32_t height = cinfo.output_height;
uint32_t bpp = 24;
uint8_t *data = (uint8_t *)malloc(width * height * bpp / 8);
uint8_t *line = (uint8_t *)malloc(width * cinfo.output_components);
while (cinfo.output_scanline < cinfo.output_height) {
uint8_t *p = &data[cinfo.output_scanline * width * bpp / 8];
jpeg_read_scanlines(&cinfo, &line, 1);
for (uint32_t x = 0; x < width; x++) {
p[0] = line[x * 3 + 2];
p[1] = line[x * 3 + 1];
p[2] = line[x * 3 + 0];
p += 3;
}
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(file);
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *window = SDL_CreateWindow("Image Viewer", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, 0);
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 0);
SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB24, SDL_TEXTUREACCESS_STATIC, width, height);
SDL_UpdateTexture(texture, NULL, data, width * bpp / 8);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
SDL_Event event;
while (1) {
if (SDL_PollEvent(&event) && event.type == SDL_QUIT) {
break;
}
}
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
free(data);
free(line);
return 0;
}
```
这个示例代码使用了 libjpeg 库对 JPG 图像进行解码,然后使用 SDL2 库进行图像显示。注意,在编译时需要链接 libjpeg 和 SDL2 库,比如:
```
gcc -o image_viewer image_viewer.c -ljpeg -lSDL2
```
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