mirror of
https://github.com/daijro/camoufox.git
synced 2026-08-21 08:01:06 +00:00
Pratyush Sharma
22c6ffbdda
screeninfo makes the process per-monitor DPI aware, so it reports physical pixels, while Firefox lays windows out in CSS pixels. At 150% Windows scaling a 1920x1080 panel is 1280x720 CSS px, so bounding the fingerprint by the physical size lets the window open 1.5x larger than the screen. Refs #425
93 lines
3.3 KiB
Python
93 lines
3.3 KiB
Python
"""
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Tests for camoufox.display -- probing the host monitor in CSS pixels.
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Guards daijro/camoufox#425: with Windows display scaling enabled, screeninfo
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reports physical pixels while Firefox lays windows out in CSS pixels, so the
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browser window opened larger than the screen.
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Run with:
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cd pythonlib && python -m pytest tests/test_display.py -v
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"""
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import os
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import sys
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from types import SimpleNamespace
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sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
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import pytest # noqa: E402
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from camoufox import display # noqa: E402
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def monitor(width, height, x=0, y=0):
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return SimpleNamespace(width=width, height=height, x=x, y=y)
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@pytest.fixture
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def monitors(monkeypatch):
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"""Stub out screeninfo with an explicit monitor list."""
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def _set(*found):
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monkeypatch.setattr(display, "get_monitors", lambda: list(found))
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return _set
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class TestLargestDisplay:
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def test_reports_unscaled_display_verbatim(self, monkeypatch, monitors):
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monkeypatch.setattr(display, "OS_NAME", "lin")
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monitors(monitor(1920, 1080))
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assert display.largest_display() == (1920, 1080)
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@pytest.mark.parametrize(
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("dpi", "expected"),
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[(96, (1920, 1080)), (120, (1536, 864)), (144, (1280, 720)), (192, (960, 540))],
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)
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def test_windows_scaling_converts_to_css_pixels(
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self, monkeypatch, monitors, dpi, expected
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):
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monkeypatch.setattr(display, "OS_NAME", "win")
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monkeypatch.setattr(display, "_windows_monitor_dpi", lambda m: dpi)
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monitors(monitor(1920, 1080))
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assert display.largest_display() == expected
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def test_scaling_is_windows_only(self, monkeypatch, monitors):
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"""macOS and X11 already report CSS pixels; never rescale them."""
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monkeypatch.setattr(display, "_windows_monitor_dpi", lambda m: 192)
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monitors(monitor(1920, 1080))
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for os_name in ("mac", "lin"):
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monkeypatch.setattr(display, "OS_NAME", os_name)
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assert display.largest_display() == (1920, 1080)
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def test_falls_back_to_1x_when_dpi_lookup_fails(self, monkeypatch, monitors):
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def unavailable(_):
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raise OSError("GetDpiForMonitor failed")
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monkeypatch.setattr(display, "OS_NAME", "win")
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monkeypatch.setattr(display, "_windows_monitor_dpi", unavailable)
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monitors(monitor(1920, 1080))
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assert display.largest_display() == (1920, 1080)
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def test_falls_back_to_1x_on_nonsense_dpi(self, monkeypatch, monitors):
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monkeypatch.setattr(display, "OS_NAME", "win")
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monkeypatch.setattr(display, "_windows_monitor_dpi", lambda m: 0)
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monitors(monitor(1920, 1080))
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assert display.largest_display() == (1920, 1080)
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def test_picks_the_roomiest_monitor(self, monkeypatch, monitors):
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monkeypatch.setattr(display, "OS_NAME", "lin")
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monitors(monitor(1280, 720), monitor(2560, 1440), monitor(1920, 1080))
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assert display.largest_display() == (2560, 1440)
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def test_none_when_no_monitors(self, monitors):
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monitors()
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assert display.largest_display() is None
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def test_none_when_enumeration_raises(self, monkeypatch):
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def boom():
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raise RuntimeError("no display")
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monkeypatch.setattr(display, "get_monitors", boom)
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assert display.largest_display() is None
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