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improved FPS counter

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Shows real frame update time rather than refresh time
This commit is contained in:
itsmattkc
2021-03-15 11:34:09 +11:00
parent 056a1202d6
commit a30d031a9c
3 changed files with 46 additions and 22 deletions
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app/widget/viewer/viewerdisplay.cpp
+33 -14
View File
@@ -55,6 +55,9 @@ ViewerDisplayWidget::ViewerDisplayWidget(QWidget *parent) :
// Initializes cursor based on tool
UpdateCursor();
const int kFrameRateAverageCount = 8;
frame_rate_averages_.resize(kFrameRateAverageCount);
}
ViewerDisplayWidget::~ViewerDisplayWidget()
@@ -187,6 +190,8 @@ void ViewerDisplayWidget::ResetFPSTimer()
{
fps_timer_start_ = QDateTime::currentMSecsSinceEpoch();
fps_timer_update_count_ = 0;
frames_skipped_ = 0;
frame_rate_average_count_ = 0;
}
void ViewerDisplayWidget::mousePressEvent(QMouseEvent *event)
@@ -357,22 +362,36 @@ void ViewerDisplayWidget::OnPaint()
p.drawLines(lines, 2);
}
fps_timer_update_count_++;
if (show_fps_) {
QPainter p(inner_widget());
qint64 now = QDateTime::currentMSecsSinceEpoch();
double frame_rate;
if (now == fps_timer_start_) {
// This will cause a divide by zero, so we do nothing here
frame_rate = 0;
} else {
frame_rate = double(fps_timer_update_count_) / double((now - fps_timer_start_)/1000.0);
}
DrawTextWithCrudeShadow(&p, inner_widget()->rect(), tr("%1 FPS").arg(QString::number(frame_rate, 'f', 2)));
{
qint64 now = QDateTime::currentMSecsSinceEpoch();
double frame_rate;
if (now == fps_timer_start_) {
// This will cause a divide by zero, so we do nothing here
frame_rate = 0;
} else {
frame_rate = double(fps_timer_update_count_) / double((now - fps_timer_start_)/1000.0);
}
if (frames_skipped_ > 0) {
DrawTextWithCrudeShadow(&p, inner_widget()->rect().adjusted(0, p.fontMetrics().height(), 0, 0),
tr("%1 frames skipped").arg(frames_skipped_));
frame_rate_averages_[frame_rate_average_count_%frame_rate_averages_.size()] = frame_rate;
frame_rate_average_count_++;
}
if (frame_rate_average_count_ >= frame_rate_averages_.size()) {
QPainter p(inner_widget());
double average = 0.0;
for (int i=0; i<frame_rate_averages_.size(); i++) {
average += frame_rate_averages_[i];
}
average /= double(frame_rate_averages_.size());
DrawTextWithCrudeShadow(&p, inner_widget()->rect(), tr("%1 FPS").arg(QString::number(average, 'f', 1)));
if (frames_skipped_ > 0) {
DrawTextWithCrudeShadow(&p, inner_widget()->rect().adjusted(0, p.fontMetrics().height(), 0, 0),
tr("%1 frames skipped").arg(frames_skipped_));
}
}
}
}