[Octave-bug-tracker] [bug #49053] figure scaling issue with Qt 5 on macOS with Retina / HiDPI scaling

[Pantxo Diribarne]

Follow-up Comment #103, bug #49053 (project octave):

@John:
>> I don't think there is a different opengl_renderer object for each figure,
right?

No (or yes :-), a new renderer object is instantiated on the heap each time a
figure has to be (re)drawn (see e.g.
http://octave.org/doxygen/4.2/de/d86/GLCanvas_8cc_source.html#l00056).
Something like:


opengl_renderer r;
r.set_viewport (...)
r.draw (go);


Since opengl_renderer has no static variables, it starts from fresh each time
a redraw is requested. So the approach I proposed (and that you already tried)
has no reason to not work:


opengl_renderer r;
r.set_viewport (...);
double val = go.get ("__devicePixelRatio__").double_value ();
r.set_devicePixelRatio (val);
r.draw (go);




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