How do get monochrome pixel(1bpp) data from pixmap in GTK2 with linux?

From: Vignesh Kumar <ur vigneshkumar gmail com>
To: gtk-list gnome org
Subject: How do get monochrome pixel(1bpp) data from pixmap in GTK2 with linux?
Date: Wed, 4 Jul 2018 11:25:42 +0530

Hello,

Source:

GdkPixmap* m_pixmap;

m_pixmap = gdk_pixmap_new(wxGetRootWindow()->window, m_width, m_height, 1/*monochrome*/);

gdk_pixbuf_get_pixels() does not supported by 1bpp. How to get the raw pixel(1bpp)data from pixmap? Is there any possible ways to do this?