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In testing#6540, I can see that neither Cairo backend is able to render images correctly.
With GTKCairo:
Traceback (most recent call last): File".../lib/matplotlib/backends/backend_gtk.py", line438, inexpose_eventself._render_figure(self._pixmap, w, h) File".../lib/matplotlib/backends/backend_gtk.py", line426, in_render_figureself.figure.draw (self._renderer) File".../lib/matplotlib/artist.py", line63, indraw_wrapper draw(artist, renderer,*args,**kwargs) File".../lib/matplotlib/figure.py", line1129, indraw renderer,self, dsu,self.suppressComposite) File".../lib/matplotlib/image.py", line139, in_draw_list_compositing_images a.draw(renderer) File".../lib/matplotlib/artist.py", line63, indraw_wrapper draw(artist, renderer,*args,**kwargs) File".../lib/matplotlib/axes/_base.py", line2353, indraw mimage._draw_list_compositing_images(renderer,self, dsu) File".../lib/matplotlib/image.py", line163, in_draw_list_compositing_images flush_images() File".../lib/matplotlib/image.py", line147, inflush_images image_group[0].draw(renderer) File".../lib/matplotlib/artist.py", line63, indraw_wrapper draw(artist, renderer,*args,**kwargs) File".../lib/matplotlib/image.py", line464, indraw renderer.draw_image(gc, l, b, im) File".../lib/matplotlib/backends/backend_cairo.py", line180, indraw_image im.shape[1]*4)TypeError:expected a writeable buffer object
With GTK3Cairo:
Traceback (most recent call last): File".../lib/matplotlib/backends/backend_gtk3cairo.py", line45, inon_draw_eventself._render_figure(w, h) File".../lib/matplotlib/backends/backend_gtk3cairo.py", line34, in_render_figureself.figure.draw (self._renderer) File".../lib/matplotlib/artist.py", line63, indraw_wrapper draw(artist, renderer,*args,**kwargs) File".../lib/matplotlib/figure.py", line1129, indraw renderer,self, dsu,self.suppressComposite) File".../lib/matplotlib/image.py", line139, in_draw_list_compositing_images a.draw(renderer) File".../lib/matplotlib/artist.py", line63, indraw_wrapper draw(artist, renderer,*args,**kwargs) File".../lib/matplotlib/axes/_base.py", line2353, indraw mimage._draw_list_compositing_images(renderer,self, dsu) File".../lib/matplotlib/image.py", line163, in_draw_list_compositing_images flush_images() File".../lib/matplotlib/image.py", line147, inflush_images image_group[0].draw(renderer) File".../lib/matplotlib/artist.py", line63, indraw_wrapper draw(artist, renderer,*args,**kwargs) File".../lib/matplotlib/image.py", line464, indraw renderer.draw_image(gc, l, b, im) File".../lib/matplotlib/backends/backend_cairo.py", line180, indraw_image im.shape[1]*4)TypeError:expected a writeable buffer object