1 files changed, 31 insertions, 18 deletions

diff --git a/ftnoir_tracker_ht/ht_video_widget.cpp b/ftnoir_tracker_ht/ht_video_widget.cpp
index c6d59b34..1c5f565c 100644
--- a/ftnoir_tracker_ht/ht_video_widget.cpp
+++ b/ftnoir_tracker_ht/ht_video_widget.cpp
@@ -14,31 +14,44 @@ using namespace std;
 void HTVideoWidget::update_image(unsigned char *frame, int width, int height)
 {
     QMutexLocker foo(&mtx);
-    memcpy(fb, frame, width * height * 3);
-    this->width = width;
-    this->height = height;
+    if (!fresh)
+    {
+        memcpy(fb, frame, width * height * 3);
+        this->width = width;
+        this->height = height;
+        fresh = true;
+    }
 }
 
 void HTVideoWidget::update_and_repaint()
 {
-    QMutexLocker foo(&mtx);
-    if (width*height <= 0)
-        return;
-    QImage qframe = QImage(width, height, QImage::Format_RGB888);
-    uchar* data = qframe.bits();
-    const int pitch = qframe.bytesPerLine();
-    for (int y = 0; y < height; y++)
+    QImage qframe;
     {
-        const int part = y*width;
-        for (int x = 0; x < width; x++)
+        QMutexLocker foo(&mtx);
+        if (width*height <= 0 || !fresh)
+            return;
+        fresh = false;
+        qframe = QImage(width, height, QImage::Format_RGB888);
+        uchar* data = qframe.bits();
+        const int pitch = qframe.bytesPerLine();
+        for (int y = 0; y < height; y++)
         {
-            const int pos = 3 * (part + x);
-            data[y * pitch + x * 3 + 0] = fb[pos + 2];
-            data[y * pitch + x * 3 + 1] = fb[pos + 1];
-            data[y * pitch + x * 3 + 2] = fb[pos + 0];
+            const int part = y*width;
+            for (int x = 0; x < width; x++)
+            {
+                const int pos = 3 * (part + x);
+                const int x_ = x * 3;
+                data[x_ + 0] = fb[pos + 2];
+                data[x_ + 1] = fb[pos + 1];
+                data[x_ + 2] = fb[pos + 0];
+            }
+            data += pitch;
         }
     }
-    auto qframe2 = qframe.scaled(size(), Qt::IgnoreAspectRatio, Qt::FastTransformation);
-    texture = qframe2;
+    qframe = qframe.scaled(size(), Qt::IgnoreAspectRatio, Qt::FastTransformation);
+    {
+        QMutexLocker foo(&mtx);
+        texture = qframe;
+    }
     update();
 }