mirror of
https://github.com/cookiengineer/audacity
synced 2025-07-14 15:48:21 +02:00
173652875d
Before this change, an idle Audacity on a recent Linux laptop uses 6%
of CPU. This is because DrawOverlays() is called every 50ms through a
timer in TrackPanel, which instanciates a wxClientDC. This is quite
expensive and dominates the profiles: creating wxClientDCs is 84% of
the CPU audacity spends while idle, according to callgrind. With this
change, we avoid creating wxClientDCs when it's not necessary.
After this change, and idle Audacity consumes 1.6% of CPU, and most of
the time is spend in gtk/wxwidgets processing events.
Here are the perf stats of an idle Audacity before the change:
524.425485 task-clock (msec) # 0.060 CPUs utilized
825 context-switches # 0.002 M/sec
36 cpu-migrations # 0.069 K/sec
0 page-faults # 0.000 K/sec
1,198,433,346 cycles # 2.285 GHz
1,243,329,771 instructions # 1.04 insn per cycle
308,073,049 branches # 587.449 M/sec
5,801,494 branch-misses # 1.88% of all branches
8.808129958 seconds time elapsed
and after:
149.110455 task-clock (msec) # 0.016 CPUs utilized
908 context-switches # 0.006 M/sec
32 cpu-migrations # 0.215 K/sec
0 page-faults # 0.000 K/sec
313,372,582 cycles # 2.102 GHz
167,401,770 instructions # 0.53 insn per cycle
41,857,947 branches # 280.718 M/sec
1,189,566 branch-misses # 2.84% of all branches
9.076940003 seconds time elapsed
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
//
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// OverlayPanel.h
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// Audacity
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//
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// Created by Paul Licameli on 5/1/16.
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//
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//
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#ifndef __AUDACITY_OVERLAY_PANEL__
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#define __AUDACITY_OVERLAY_PANEL__
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#include <vector>
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#include "BackedPanel.h"
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class Overlay;
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class AUDACITY_DLL_API OverlayPanel /* not final */ : public BackedPanel {
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public:
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OverlayPanel(wxWindow * parent, wxWindowID id,
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const wxPoint & pos,
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const wxSize & size,
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// default as for wxPanel:
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long style = wxTAB_TRAVERSAL | wxNO_BORDER);
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// Registers and unregisters overlay objects.
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// The sequence in which they were registered is the sequence in
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// which they are painted.
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// OverlayPanel is not responsible for their memory management.
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void AddOverlay(Overlay *pOverlay);
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// Returns true if the overlay was found
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bool RemoveOverlay(Overlay *pOverlay);
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void ClearOverlays();
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// Erases and redraws to the client area the overlays that have
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// been previously added with AddOverlay(). If "repaint_all" is
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// true, all overlays will be erased and re-drawn. Otherwise, only
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// the ones that are out-of-date, as well as the intersecting ones,
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// will be erased and re-drawn.
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// pDC can be null, in which case, DrawOverlays() will create a
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// wxClientDC internally when necessary.
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void DrawOverlays(bool repaint_all, wxDC *pDC = nullptr);
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private:
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std::vector<Overlay*> mOverlays;
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DECLARE_EVENT_TABLE()
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};
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#endif
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