6 files changed, 10 insertions, 11 deletions
diff --git a/tracker-pt/ftnoir_tracker_pt.cpp b/tracker-pt/ftnoir_tracker_pt.cpp
index 570d76c4..64fd6fd5 100644
--- a/tracker-pt/ftnoir_tracker_pt.cpp
+++ b/tracker-pt/ftnoir_tracker_pt.cpp
@@ -72,7 +72,7 @@ void Tracker_PT::run()
             const bool preview_visible = check_is_visible();
 
             if (preview_visible)
-                *preview_frame = *frame;
+                preview_frame->set_last_frame(*frame);
 
             point_extractor->extract_points(*frame, *preview_frame, preview_visible, points);
             point_count.store(points.size(), std::memory_order_relaxed);
diff --git a/tracker-pt/module/frame.cpp b/tracker-pt/module/frame.cpp
index b8f2b7cb..798706b8 100644
--- a/tracker-pt/module/frame.cpp
+++ b/tracker-pt/module/frame.cpp
@@ -6,7 +6,7 @@
 
 namespace pt_module {
 
-Preview& Preview::operator=(const pt_frame& frame_)
+void Preview::set_last_frame(const pt_frame& frame_)
 {
     const cv::Mat& frame2 = frame_.as_const<const Frame>()->mat;
     const cv::Mat* frame;
diff --git a/tracker-pt/module/frame.hpp b/tracker-pt/module/frame.hpp
index ae0a0cbc..1e7c82b6 100644
--- a/tracker-pt/module/frame.hpp
+++ b/tracker-pt/module/frame.hpp
@@ -24,7 +24,7 @@ struct Preview final : pt_preview
 {
     Preview(int w, int h);
 
-    Preview& operator=(const pt_frame& frame) override;
+    void set_last_frame(const pt_frame& frame) override;
     QImage get_bitmap() override;
     void draw_head_center(f x, f y) override;
 
diff --git a/tracker-pt/pt-api.hpp b/tracker-pt/pt-api.hpp
index b87e7d65..75e880d4 100644
--- a/tracker-pt/pt-api.hpp
+++ b/tracker-pt/pt-api.hpp
@@ -69,7 +69,11 @@ protected:
 
 struct pt_preview : pt_frame
 {
-    virtual pt_preview& operator=(const pt_frame&) = 0;
+    pt_preview() = default;
+
+    OTR_DISABLE_MOVE_COPY(pt_preview);
+
+    virtual void set_last_frame(const pt_frame&) = 0;
     virtual QImage get_bitmap() = 0;
     virtual void draw_head_center(f x, f y) = 0;
 };
diff --git a/tracker-wii/wii_frame.cpp b/tracker-wii/wii_frame.cpp
index 8f18f4b8..fcde5235 100644
--- a/tracker-wii/wii_frame.cpp
+++ b/tracker-wii/wii_frame.cpp
@@ -17,7 +17,7 @@
 
 using namespace pt_module;
 
-WIIPreview& WIIPreview::operator=(const pt_frame& frame_)
+void WIIPreview::set_last_frame(const pt_frame& frame_)
 {
     const struct wii_info& wii = frame_.as_const<WIIFrame>()->wii;
     const cv::Mat& frame = frame_.as_const<const WIIFrame>()->mat;
@@ -25,18 +25,13 @@ WIIPreview& WIIPreview::operator=(const pt_frame& frame_)
     status = wii.status;
 
     if (frame.channels() != 3)
-    {
         eval_once(qDebug() << "tracker/pt: camera frame depth: 3 !=" << frame.channels());
-        return *this;
-    }
 
     const bool need_resize = frame.cols != frame_out.cols || frame.rows != frame_out.rows;
     if (need_resize)
         cv::resize(frame, frame_copy, cv::Size(frame_out.cols, frame_out.rows), 0, 0, cv::INTER_NEAREST);
     else
         frame.copyTo(frame_copy);
-
-    return *this;
 }
 
 WIIPreview::WIIPreview(int w, int h)
diff --git a/tracker-wii/wii_frame.hpp b/tracker-wii/wii_frame.hpp
index 5d6dd199..a7688b80 100644
--- a/tracker-wii/wii_frame.hpp
+++ b/tracker-wii/wii_frame.hpp
@@ -47,7 +47,7 @@ struct WIIPreview final : pt_preview
 {
     WIIPreview(int w, int h);
 
-    WIIPreview& operator=(const pt_frame& frame) override;
+    void set_last_frame(const pt_frame& frame) override;
     QImage get_bitmap() override;
     void draw_head_center(f x, f y) override;