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plotter-app/venv/lib/python3.8/site-packages/matplotlib/backends/backend_tkcairo.py

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+import sys
+
+import numpy as np
+
+from . import _backend_tk
+from .backend_cairo import cairo, FigureCanvasCairo
+from ._backend_tk import _BackendTk, FigureCanvasTk
+
+
+class FigureCanvasTkCairo(FigureCanvasCairo, FigureCanvasTk):
+    def draw(self):
+        width = int(self.figure.bbox.width)
+        height = int(self.figure.bbox.height)
+        surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
+        self._renderer.set_context(cairo.Context(surface))
+        self._renderer.dpi = self.figure.dpi
+        self.figure.draw(self._renderer)
+        buf = np.reshape(surface.get_data(), (height, width, 4))
+        _backend_tk.blit(
+            self._tkphoto, buf,
+            (2, 1, 0, 3) if sys.byteorder == "little" else (1, 2, 3, 0))
+
+
+@_BackendTk.export
+class _BackendTkCairo(_BackendTk):
+    FigureCanvas = FigureCanvasTkCairo