How to display pictures in C language code

To display images in C language, you can use the SDL2 library: initialize the SDL2 library; create a window; create a renderer; load an image; create an image texture; clear the renderer; render an image; update the display; main loop; destroy resource.

Display pictures in C language

In C language, you can use the SDL2 library (Simple DirectMedia Layer) to display image. The following steps describe how to use SDL2 to display images in C language:

1. Initialize the SDL2 library

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

int main() {
  if (SDL_Init(SDL_INIT_VIDEO) != 0) {
    fprintf(stderr, "SDL_Init Error: %s\n", SDL_GetError());
    return 1;
  }

2. Create a window

  SDL_Window *window = SDL_CreateWindow("Image Viewer", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_SHOWN);
  if (window == NULL) {
    fprintf(stderr, "SDL_CreateWindow Error: %s\n", SDL_GetError());
    SDL_Quit();
    return 1;
  }

3. Create a renderer

  SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
  if (renderer == NULL) {
    fprintf(stderr, "SDL_CreateRenderer Error: %s\n", SDL_GetError());
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 1;
  }

4. Load an image

  SDL_Surface *image = SDL_LoadBMP("image.bmp");
  if (image == NULL) {
    fprintf(stderr, "SDL_LoadBMP Error: %s\n", SDL_GetError());
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 1;
  }

5. Create an image texture

  SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, image);
  SDL_FreeSurface(image);
  if (texture == NULL) {
    fprintf(stderr, "SDL_CreateTextureFromSurface Error: %s\n", SDL_GetError());
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 1;
  }

6. Clear renderer

  SDL_RenderClear(renderer);

7. Render image

  int w, h;
  SDL_QueryTexture(texture, NULL, NULL, &w, &h);
  SDL_Rect dstrect = { 0, 0, w, h };
  SDL_RenderCopy(renderer, texture, NULL, &dstrect);

8. Update Display

  SDL_RenderPresent(renderer);

9. Main loop

  SDL_Event event;
  while (SDL_PollEvent(&event)) {
    if (event.type == SDL_QUIT) {
      break;
    }
  }

10. Destroy resources

  SDL_DestroyTexture(texture);
  SDL_DestroyRenderer(renderer);
  SDL_DestroyWindow(window);
  SDL_Quit();
  return 0;
}

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