few widgets: use repaint() for no event loop overhead

The Qt event loop overhead formed a decent amount of total CPU
usage. `repaint()' is a direct call.

4 files changed, 12 insertions, 11 deletions

diff --git a/cv/video-widget.cpp b/cv/video-widget.cpp
index e688732c..f4c16776 100644
--- a/cv/video-widget.cpp
+++ b/cv/video-widget.cpp
@@ -9,8 +9,9 @@
 #include "video-widget.hpp"
 #include <opencv2/imgproc.hpp>
 
-cv_video_widget::cv_video_widget(QWidget* parent) :
-    QWidget(parent), freshp(false)
+cv_video_widget::cv_video_widget(QWidget* parent) : QWidget(parent),
+    mtx(QMutex::Recursive),
+    freshp(false)
 {
     connect(&timer, SIGNAL(timeout()), this, SLOT(update_and_repaint()), Qt::DirectConnection);
     timer.start(65);
@@ -73,6 +74,6 @@ void cv_video_widget::update_and_repaint()
     if (freshp)
     {
         freshp = false;
-        update();
+        repaint();
     }
 }
diff --git a/gui/main-window.cpp b/gui/main-window.cpp
index fb036721..1fdfcb53 100644
--- a/gui/main-window.cpp
+++ b/gui/main-window.cpp
@@ -86,7 +86,7 @@ MainWindow::MainWindow() :
 
     // timers
     connect(&config_list_timer, &QTimer::timeout, this, [this]() { refresh_config_list(); });
-    connect(&pose_update_timer, SIGNAL(timeout()), this, SLOT(showHeadPose()));
+    connect(&pose_update_timer, SIGNAL(timeout()), this, SLOT(showHeadPose()), Qt::DirectConnection);
     connect(&det_timer, SIGNAL(timeout()), this, SLOT(maybe_start_profile_from_executable()));
 
     // ctrl+q exits
@@ -515,8 +515,8 @@ void MainWindow::display_pose(const double *mapped, const double *raw)
     ui.pose_display->rotate_async(mapped[Yaw], mapped[Pitch], -mapped[Roll],
                                   mapped[TX], mapped[TY], mapped[TZ]);
 
-    if (mapping_widget)
-        mapping_widget->update();
+    if (mapping_widget && mapping_widget->isVisible())
+        mapping_widget->repaint();
 
     QLCDNumber* raw_[] = {
         ui.raw_x, ui.raw_y, ui.raw_z,
diff --git a/pose-widget/pose-widget.cpp b/pose-widget/pose-widget.cpp
index 8caf65b7..8f4c4a1b 100644
--- a/pose-widget/pose-widget.cpp
+++ b/pose-widget/pose-widget.cpp
@@ -86,7 +86,7 @@ void pose_widget::rotate_async(double xAngle, double yAngle, double zAngle, doub
     bool expected = true;
     if (xform.fresh.compare_exchange_weak(expected, false))
     {
-        update();
+        repaint();
         xform.rotate_async(xAngle, yAngle, zAngle, x, y, z);
     }
 }
diff --git a/spline/spline-widget.cpp b/spline/spline-widget.cpp
index c7dd5e5a..1a39cc23 100644
--- a/spline/spline-widget.cpp
+++ b/spline/spline-widget.cpp
@@ -379,7 +379,7 @@ void spline_widget::mousePressEvent(QMouseEvent *e)
         }
     }
     _draw_function = true;
-    update();
+    repaint();
 }
 
 void spline_widget::mouseMoveEvent(QMouseEvent *e)
@@ -433,7 +433,7 @@ void spline_widget::mouseMoveEvent(QMouseEvent *e)
 
         setCursor(Qt::ClosedHandCursor);
         show_tooltip(pix, new_pt);
-        update();
+        repaint();
     }
     else if (sz)
     {
@@ -480,7 +480,7 @@ void spline_widget::mouseReleaseEvent(QMouseEvent *e)
         else
             QToolTip::hideText();
 
-        update();
+        repaint();
     }
 }
 
@@ -551,7 +551,7 @@ void spline_widget::update_range()
     _background = QPixmap();
     _function = QPixmap();
 
-    update();
+    repaint();
 }
 
 bool spline_widget::point_within_pixel(const QPointF& pt, const QPoint &pixel)