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Kumataro avatar Kumataro commented on June 4, 2024

While this was happening, I noticed that the CPU usage was 100%.

However, even if I called namedWindow() in advance and the image was displayed correctly, the CPU usage was 100%.

I also created an additional patch to reduce CPU usage, but this issue was not resolved. For the above reasons, CPU usage does not seem to be the cause.

from opencv.

Kumataro avatar Kumataro commented on June 4, 2024

opencv/modules/highgui/src/window_wayland.cpp

Lines 2462 to 2473 in 2a2ff55

CV_IMPL void cvShowImage(const char *name, const CvArr *arr) {
auto cv_core = CvWlCore::getInstance();
auto window = cv_core.get_window(name);
if (!window) {
cv_core.create_window(name, cv::WINDOW_AUTOSIZE);
if (!(window = cv_core.get_window(name)))
CV_Error_(StsNoMem, ("Failed to create window: %s", name));
}
cv::Mat mat = cv::cvarrToMat(arr, true);
window->show_image(mat);
}

To reuse the result of getInstance() repeatedly looks like better efficient implementation.
However, it defined as static shared_ptr member variable in CvWlCore.
If it reaches out of scope, cv_wl_core::~cv_wl_core() is called and all windows will be destroyed.

opencv/modules/highgui/src/window_wayland.cpp

Lines 2289 to 2292 in 2a2ff55

cv_wl_core::~cv_wl_core() {
this->destroy_all_windows();
display_.reset();
}

from opencv.

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