monitor info via gtk api

monitor-info.c

/* -*- mode: C; c-file-style: "stroustrup"; indent-tabs-mode: nil; -*- */

#include <gdk/gdk.h>
#include <gtk/gtk.h>

#ifdef GDK_WINDOWING_WAYLAND
#include <gdk/gdkwayland.h>
#endif
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif

int
main (int argc, char **argv)
{
    GdkDisplay *display;
    GdkRectangle geo;
    int i, n;
    gboolean is_wayland = FALSE;

#if GTK_CHECK_VERSION(4, 0, 0)
    gboolean ok = gtk_init_check();
#else    
    gboolean ok = gtk_init_check(&argc, &argv);
#endif
    
    if (!ok) {
        return -1;
    }

    g_print("Gtk+ version: %d.%d.%d\n",
            gtk_get_major_version(),
            gtk_get_minor_version(),
            gtk_get_micro_version());

    display = gdk_display_get_default ();
    if (display == NULL) {
        return -1;
    }

#ifdef GDK_WINDOWING_WAYLAND
    if (GDK_IS_WAYLAND_DISPLAY(display)) {
        g_print("Wayland\n");
        is_wayland = TRUE;
    }
#endif
#ifdef GDK_WINDOWING_X11
    if (!is_wayland && GDK_IS_X11_DISPLAY (display)) {
        g_print("X11\n");
    }
#endif

    n = gdk_display_get_n_monitors(display);

    for (i = 0; i < n; i++) {
        GdkMonitor *moni = gdk_display_get_monitor(display, i);
        const char *model = gdk_monitor_get_model(moni);

        int w = gdk_monitor_get_width_mm(moni);
        int h = gdk_monitor_get_height_mm(moni);

        int sf = gdk_monitor_get_scale_factor(moni);
        gdk_monitor_get_geometry(moni, &geo);
        int x = geo.width;
        int y = geo.height;

        g_print("\n");
        g_print("Monitor: %s [%d]\n", model, i);
        g_print(" %d x %d [mm x mm]\n", w, h);
        g_print(" %d x %d [px]\n", x, y);
        g_print(" scale: %d\n", sf);
    }
    return 0;
}