How can I port MFC
TotalDC.TransparentBlt(position.x, position.y, width, height, &image1DC, 0, 0, width, height, RGB(255, 255, 255));
to GNOME/gdk/gtkmm/cairo?
I know that MFC "BitBlt();" can be ported using
image1->copy_area(0,0,width,height,Total,position.x,position.y);
But this function does not designate the transparent RGB(r,g,b).