#!/usr/bin/python
import sys
import gi
from gi.repository import GObject, GLib, Gdk, GdkX11
import cairo
GObject.threads_init()
GLib.threads_init()

class CairoLeak:
    def __init__( self ):
        window_attrs = Gdk.WindowAttr()
        window_attrs.title = "Leak"
        window_attrs.event_mask = Gdk.EventMask.EXPOSURE_MASK
        window_attrs.width = 400
        window_attrs.height = 300
        window_attrs.wclass = Gdk.WindowWindowClass.INPUT_OUTPUT
        window_attrs.window_type = Gdk.WindowType.TOPLEVEL
        window_attrs.visual = Gdk.Screen.get_default().get_rgba_visual()
        self.window = Gdk.Window( None, window_attrs, Gdk.WindowAttributesType.TITLE | Gdk.WindowAttributesType.VISUAL )

        self.letterbox_colour = [ 255, 0, 0, 255 ]
        Gdk.Event.handler_set( self.__gdkEventHandler, None )

        self.window.show()

    def __gdkEventHandler( self, event, data ):
        self.draw()

    def draw( self ):
        cr = self.window.cairo_create()

        cr.set_operator( cairo.OPERATOR_SOURCE )
        cr.set_source_rgba( self.letterbox_colour[0] / 255.0,
                            self.letterbox_colour[1] / 255.0,
                            self.letterbox_colour[2] / 255.0,
                            self.letterbox_colour[3] / 255.0 )
        cr.paint()
        Gdk.flush()
        self.letterbox_colour = [self.letterbox_colour[2],
                                 self.letterbox_colour[0],
                                 self.letterbox_colour[1],
                                 self.letterbox_colour[3]]

def triggerLeak( leaker ):
    leaker.draw()

    global repeat_count
    repeat_count -= 1

    if repeat_count <= 0:
        global main_loop
        main_loop.quit()

    return repeat_count > 0

def main( argv ):
    global repeat_count
    repeat_count = int( sys.argv[1] )

    global main_loop
    main_loop = GLib.MainLoop()

    leaker = CairoLeak()

    GLib.timeout_add_seconds( 1, triggerLeak, leaker )

    main_loop.run()

if __name__ == '__main__':
    sys.exit( main( sys.argv ) )