transparent.c

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

static void destroy_cb(GtkWidget* widget, gpointer data) {
    gtk_main_quit();
}

int main(int argc, char* argv[]) {
    gtk_init(&argc, &argv);

    if (argc == 1) {
        printf("Usage: URI\n");
        return 1;
    }
    const char *uri = argv[1];

    if(!g_thread_supported())
        g_thread_init(NULL);

    // Create a Window, set colormap to RGBA
    GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    GdkScreen *screen = gtk_widget_get_screen(window);

#if GTK_CHECK_VERSION(3, 0, 0)
    GdkVisual *visual = gdk_screen_get_rgba_visual(screen);
    if (visual && gdk_screen_is_composited (screen)) {
        gtk_widget_set_visual(GTK_WIDGET(window), visual);
    }
#else
    GdkColormap *rgba = gdk_screen_get_rgba_colormap (screen);s
    if (rgba && gdk_screen_is_composited (screen)) {
        gtk_widget_set_default_colormap(rgba);
        gtk_widget_set_default_colormap(rgba);
    }
#endif

    gtk_window_set_default_size(GTK_WINDOW(window), 600, 400);
    g_signal_connect(window, "destroy", G_CALLBACK(destroy_cb), NULL);

    // Optional: for dashboard style borderless windows
    gtk_window_set_decorated(GTK_WINDOW(window), FALSE);


    // Create a WebView, set it transparent, add it to the window
    WebKitWebView* web_view = WEBKIT_WEB_VIEW(webkit_web_view_new());
    webkit_web_view_set_transparent(web_view, TRUE);
    gtk_container_add (GTK_CONTAINER(window), GTK_WIDGET(web_view));

    // Load a default page
    webkit_web_view_load_uri(web_view, uri);

    // Show it and continue running until the window closes
    gtk_widget_grab_focus(GTK_WIDGET(web_view));
    gtk_widget_show_all(window);
    gtk_main();
    return 0;
}