/*
  on ubuntu/debian: sudo apt-get -y install libgtk-4-dev

  compile: gcc $(pkg-config --cflags gtk4) -o image image.c $(pkg-config --libs gtk4)

#include <gtk/gtk.h>

static void
activate (GtkApplication *app, gpointer user_data)
{
  GtkWidget *window;
  GtkWidget *image;

  window = gtk_application_window_new(app);
  gtk_window_set_title(GTK_WINDOW(window), "Image Viewer");
  gtk_window_set_default_size(GTK_WINDOW (window), 320, 200);

  image = gtk_image_new_from_file("some-image.png");
  gtk_window_set_child(GTK_WINDOW(window), image);

  gtk_window_present(GTK_WINDOW(window));
}

int main (int argc, char **argv)
{
  GtkApplication *app;
  int status;

  app = gtk_application_new("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
  g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
  status = g_application_run(G_APPLICATION(app), argc, argv);
  g_object_unref(app);

  return status;
}