Matplotlib Device Scaling on Windows #30599
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tacaswell
reviewed
Sep 25, 2025
| self.window.protocol("WM_DELETE_WINDOW", destroy) | ||
| self.window.deiconify() | ||
| self.canvas._tkcanvas.focus_set() | ||
| if self._window_dpi.get() != 96: |
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How does this intersect with the discussion in #21875 ? |
tacaswell
reviewed
Sep 25, 2025
| (GetDpiForWindow_t)GetProcAddress(user32, "GetDpiForWindow"); | ||
| if (GetDpiForWindowPtr == NULL) { | ||
| FreeLibrary(user32); | ||
| return py::cast(false); |
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Is completely returning here correct? Is there a case where we may not be able to get the methods for managing the dpi but still need to run the setWindowSubclass method?
anntzer
reviewed
Sep 29, 2025
| // window_dpi variable stored on interp. | ||
| typedef UINT (WINAPI *GetDpiForWindow_t)(HWND); | ||
| GetDpiForWindow_t GetDpiForWindowPtr = | ||
| (GetDpiForWindow_t)GetProcAddress(user32, "GetDpiForWindow"); |
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Please use the shorter style for casting as in #30615.
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PR summary
This PR closes #26733.
Basically, the change in DPI is signaled when resizing or changing the device scale, and not when the canvas is launched/loaded, hence the issue.
This video demonstrates the problem and the fix.