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Backport PR #30399 on branch v3.10.x (Qt: Fix HiDPI handling on X11/Windows)#30428

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1 change: 1 addition & 0 deletionslib/matplotlib/backends/backend_qt.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -273,6 +273,7 @@ def showEvent(self, event):
window = self.window().windowHandle()
current_version = tuple(int(x) for x in QtCore.qVersion().split('.', 2)[:2])
if current_version >= (6, 6):
self._update_pixel_ratio()
window.installEventFilter(self)
else:
window.screenChanged.connect(self._update_screen)
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61 changes: 23 additions & 38 deletionslib/matplotlib/tests/test_backend_qt.py
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Expand Up@@ -175,45 +175,30 @@ def set_device_pixel_ratio(ratio):
assert qt_canvas.device_pixel_ratio == ratio

qt_canvas.manager.show()
qt_canvas.draw()
qt_canvas.flush_events()
size = qt_canvas.size()
set_device_pixel_ratio(3)

# The DPI and the renderer width/height change
assert fig.dpi == 360
assert qt_canvas.renderer.width == 1800
assert qt_canvas.renderer.height == 720

# The actual widget size and figure logical size don't change.
assert size.width() == 600
assert size.height() == 240
assert qt_canvas.get_width_height() == (600, 240)
assert (fig.get_size_inches() == (5, 2)).all()

set_device_pixel_ratio(2)

# The DPI and the renderer width/height change
assert fig.dpi == 240
assert qt_canvas.renderer.width == 1200
assert qt_canvas.renderer.height == 480

# The actual widget size and figure logical size don't change.
assert size.width() == 600
assert size.height() == 240
assert qt_canvas.get_width_height() == (600, 240)
assert (fig.get_size_inches() == (5, 2)).all()

set_device_pixel_ratio(1.5)

# The DPI and the renderer width/height change
assert fig.dpi == 180
assert qt_canvas.renderer.width == 900
assert qt_canvas.renderer.height == 360

# The actual widget size and figure logical size don't change.
assert size.width() == 600
assert size.height() == 240
assert qt_canvas.get_width_height() == (600, 240)
assert (fig.get_size_inches() == (5, 2)).all()

options = [
(None, 360, 1800, 720), # Use ratio at startup time.
(3, 360, 1800, 720), # Change to same ratio.
(2, 240, 1200, 480), # Change to different ratio.
(1.5, 180, 900, 360), # Fractional ratio.
]
for ratio, dpi, width, height in options:
if ratio is not None:
set_device_pixel_ratio(ratio)

# The DPI and the renderer width/height change
assert fig.dpi == dpi
assert qt_canvas.renderer.width == width
assert qt_canvas.renderer.height == height

# The actual widget size and figure logical size don't change.
assert size.width() == 600
assert size.height() == 240
assert qt_canvas.get_width_height() == (600, 240)
assert (fig.get_size_inches() == (5, 2)).all()


@pytest.mark.backend('QtAgg', skip_on_importerror=True)
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