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Add Canvas::get_microseconds_since_render_start() method

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Initial use is for the WaveView class to determine whether on not to draw the
waveform in the GUI thread.
This commit is contained in:
Tim Mayberry 2017-03-28 15:52:28 +10:00
parent ab13e87ec2
commit 4ddf97f5a2
2 changed files with 14 additions and 0 deletions
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12
libs/canvas/canvas.cc
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@ -163,6 +163,18 @@ Canvas::prepare_for_render (Rect const & area) const
} }
} }
gint64
Canvas::get_microseconds_since_render_start () const
{
gint64 timestamp = g_get_monotonic_time();
if (_last_render_start_timestamp == 0 || timestamp <= _last_render_start_timestamp) {
return 0;
}
return timestamp - _last_render_start_timestamp;
}
ostream& ostream&
operator<< (ostream& o, Canvas& c) operator<< (ostream& o, Canvas& c)
{ {

2
libs/canvas/canvas/canvas.h
View file

@ -91,6 +91,8 @@ public:
gint64 get_last_render_start_timestamp () const { return _last_render_start_timestamp; } gint64 get_last_render_start_timestamp () const { return _last_render_start_timestamp; }
gint64 get_microseconds_since_render_start () const;
/** @return root group */ /** @return root group */
Item* root () { Item* root () {
return &_root; return &_root;