jp9000
f4f2d383b1
UI: Greatly improve main window repaint performance ...
The VolumeMeter widgets were apparently being drawn as transparent
widgets, which meant that it was necessary to redraw everything under
the widgets in order to properly draw the widgets, so the entire mixer
section of the window was being redrawn every time the meters updated.
This caused a significant perf hit when the only thing wanted/desired
was just to update the meters. This was more noticeable after changing
the audio meter update rate to 60hz from 30hz.
The fix is to simply mark them as opaque widgets, and paint the
background ourselves rather than rely on what's under the window. CPU
perf for painting the main window has been vastly improved because of
this; CPU usage of Qt in the main window is now reduced by at least half
of what it was, if not more.
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f4f2d383b1