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Commit5af6b8d

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Init FigureCanvasAgg._lastKey at class-level.
This avoids the need for getattr checks. We explicitly don't do thesame for FigureCanvasAgg.renderer because 1) if _lastKey has been set toa non-None value, then renderer has also been set and 2) initingrenderer to e.g. None would change the possible types of a publicattribute.
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‎lib/matplotlib/backends/backend_agg.py

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -387,6 +387,8 @@ def post_processing(image, dpi):
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classFigureCanvasAgg(FigureCanvasBase):
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# docstring inherited
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390+
_lastKey=None# Overwritten per-instance on the first draw.
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defcopy_from_bbox(self,bbox):
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renderer=self.get_renderer()
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returnrenderer.copy_from_bbox(bbox)
@@ -412,8 +414,7 @@ def draw(self):
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defget_renderer(self,cleared=False):
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w,h=self.figure.bbox.size
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key=w,h,self.figure.dpi
415-
reuse_renderer= (hasattr(self,"renderer")
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andgetattr(self,"_lastKey",None)==key)
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reuse_renderer= (self._lastKey==key)
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ifnotreuse_renderer:
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self.renderer=RendererAgg(w,h,self.figure.dpi)
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self._lastKey=key

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