python - How can I get pixels from cairo.ImageSurface? -


i made python program draws black rectangle white circle inside when click on button. use gtk.drawingarea , cairo.imagesurface. code following.

class app:      def __init__(self, width, height):          self.surface = cairo.imagesurface(cairo.format_argb32, width, height)          # builder         self.builder = gtk.builder()         self.builder.add_from_file('ventana.glade')         go = self.builder.get_object          # widgets         self.window      = go('window')         self.drawingarea = go('drawingarea')         self.button      = go('button')          signals = {             'gtk_main_quit'    : gtk.main_quit,             'draw'             : self.draw         }          self.builder.connect_signals(signals)         self.window.show_all()       def draw(self, widget):         context = self.drawingarea.get_window().cairo_create()         context.set_source_surface(self.surface)          context.set_source_rgba(0.0, 0.0, 0.0, 1.0)         context.rectangle(0, 0, self.surface.get_width(), self.surface.get_height())         context.fill()          context.translate(10, 10)         context.arc(0, 0, 10, 0, 2 * pi)         context.set_source_rgba(1.0, 1.0, 1.0, 1.0)         context.fill()

i following window.

enter image description here

it works fine, need rgb values of pixels of picture, tried doing map(ord, self.surface.get_data()), list of zeros.

how can list rgb of pixels?

and have problem: when minimize window or change window, drawing erases. possible avoid this?

i don't know getting color drawing, connect window 'configure-event' (event being state of window changed) , call drawingarea.queue_draw ()


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