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Qt IconEngine: Use a device pixel ratio of 1 when high-DPI pixmaps are disabled #32221

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Qt IconEngine: Use a device pixel ratio of 1 when high-DPI pixmaps are disabled #32221

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7 changes: 6 additions & 1 deletion lib/matplotlib/backends/backend_qt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -723,7 +723,12 @@ def pixmap(self, size, mode, state):

def _devicePixelRatio(self):
"""Return the current device pixel ratio for the toolbar, defaulting to 1."""
return (self.toolbar.devicePixelRatioF() or 1) if self.toolbar else 1
use_high_dpi_pixmaps = True
if hasattr(QtCore.Qt.ApplicationAttribute, "AA_UseHighDpiPixmaps"):
app = QtWidgets.QApplication.instance()
use_high_dpi_pixmaps = app.testAttribute(QtCore.Qt.AA_UseHighDpiPixmaps)
toolbar_dpr = (self.toolbar.devicePixelRatioF() or 1) if self.toolbar else 1
return toolbar_dpr if use_high_dpi_pixmaps else 1

def _create_pixmap_from_svg(self, svg_path, size):
"""Create a pixmap from SVG with proper scaling and dark mode support."""
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