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Thebinary110
9c487708f9
CI (Ubuntu ARM64 x2) showed the Python test suite aborting the whole process with exit code 134: on a Qt-enabled build, namedWindow() tried the "xcb" platform plugin, found no display (the Python test step, unlike the C++ gtest step, does not run under xvfb-run), and Qt aborted the process instead of raising a catchable exception -- so the existing try/except around namedWindow never got a chance to run. Fix: set QT_QPA_PLATFORM=offscreen (only if not already set) before any GUI call. "offscreen" is the platform plugin Qt ships specifically for headless/CI use, and is listed as available in the failing CI job's own log output. Verified locally: built opencv_python3 with WITH_QT=ON (real Qt6, not the WITH_QT=OFF build used in the initial verification), and confirmed that in a clean environment (no DISPLAY, no QT_QPA_PLATFORM preset), namedWindow + saveWindowParameters + loadWindowParameters all succeed with this fix, where they would previously depend on a native display backend being reachable.
43 lines
1.5 KiB
Python
43 lines
1.5 KiB
Python
#!/usr/bin/env python
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from __future__ import print_function
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import os
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# Force Qt's headless-safe platform plugin when nothing else is already
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# configured. Without this, namedWindow() on a Qt-enabled build with no
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# display server available (e.g. CI workers, which do not run the Python
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# test suite under a virtual framebuffer) aborts the whole process instead
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# of raising a catchable exception -- so this must be set *before* the
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# first GUI call, and a plain try/except around namedWindow is not enough.
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os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
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import cv2 as cv
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from tests_common import NewOpenCVTests
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class window_parameters_test(NewOpenCVTests):
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def test_save_load_window_parameters(self):
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window_name = "test_save_load_window_parameters"
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try:
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cv.namedWindow(window_name, cv.WINDOW_NORMAL)
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except cv.error:
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self.skipTest("No GUI backend available in this build/environment")
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try:
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# Should not raise when the library is built with a backend that
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# supports persisting window state (currently: Qt).
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cv.saveWindowParameters(window_name)
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cv.loadWindowParameters(window_name)
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except cv.error as e:
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# Expected on builds without Qt support (see NO_QT_ERR_MSG in window.cpp)
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self.skipTest("saveWindowParameters/loadWindowParameters require the Qt "
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"highgui backend: " + str(e))
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finally:
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cv.destroyWindow(window_name)
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if __name__ == '__main__':
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NewOpenCVTests.bootstrap()
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