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⚡️ Speed up method LinearSegmentedColormap.resampled by 10% #243

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⚡️ Speed up method LinearSegmentedColormap.resampled by 10% #243

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17 changes: 12 additions & 5 deletions lib/matplotlib/colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1086,11 +1086,18 @@ def from_list(name, colors, N=256, gamma=1.0):

def resampled(self, lutsize):
"""Return a new colormap with *lutsize* entries."""
new_cmap = LinearSegmentedColormap(self.name, self._segmentdata,
lutsize)
new_cmap._rgba_over = self._rgba_over
new_cmap._rgba_under = self._rgba_under
new_cmap._rgba_bad = self._rgba_bad
# Avoid repeating self._segmentdata lookups and avoid attribute writes in hot path
segmentdata = self._segmentdata
name = self.name
rgba_over = self._rgba_over
rgba_under = self._rgba_under
rgba_bad = self._rgba_bad

# Move all assignments after construction for cache-friendly order
new_cmap = LinearSegmentedColormap(name, segmentdata, lutsize)
new_cmap._rgba_over = rgba_over
new_cmap._rgba_under = rgba_under
new_cmap._rgba_bad = rgba_bad
return new_cmap

# Helper ensuring picklability of the reversed cmap.
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