fix instant sample issue when no start operations @ DSO module

DSView/DSView.qrc

@@ -51,5 +51,9 @@
         <file>icons/trigger_cn.png</file>
         <file>icons/trigger_dis_cn.png</file>
         <file>icons/protocol_cn.png</file>
+        <file>icons/instant_dis.png</file>
+        <file>icons/instant_dis_cn.png</file>
+        <file>icons/start_dis.png</file>
+        <file>icons/start_dis_cn.png</file>
     </qresource>
 </RCC>

DSView/pv/sigsession.cpp

@@ -942,6 +942,15 @@ void SigSession::feed_in_dso(const sr_datafeed_dso &dso)
 
     if (!_cur_dso_snapshot)
     {
+        // reset scale of dso signal
+        BOOST_FOREACH(const boost::shared_ptr<view::Signal> s, _signals)
+        {
+            assert(s);
+            boost::shared_ptr<view::DsoSignal> dsoSig;
+            if (dsoSig = dynamic_pointer_cast<view::DsoSignal>(s))
+                dsoSig->set_scale(dsoSig->get_view_rect().height() / 256.0f);
+        }
+
         // Create a new data snapshot
         _cur_dso_snapshot = boost::shared_ptr<data::DsoSnapshot>(
                     new data::DsoSnapshot(dso, _dev_inst->get_sample_limit(), get_ch_num(SR_CHANNEL_DSO), _instant));

DSView/pv/toolbars/samplingbar.cpp

@@ -92,10 +92,14 @@ SamplingBar::SamplingBar(SigSession &session, QWidget *parent) :
     _icon_stop(":/icons/stop_cn.png"),
     _icon_start(":/icons/start_cn.png"),
     _icon_instant(":/icons/instant_cn.png"),
+    _icon_start_dis(":/icons/start_dis_cn.png"),
+    _icon_instant_dis(":/icons/instant_dis_cn.png"),
     #else
     _icon_stop(":/icons/stop.png"),
     _icon_start(":/icons/start.png"),
     _icon_instant(":/icons/instant.png"),
+    _icon_start_dis(":/icons/start_dis.png"),
+    _icon_instant_dis(":/icons/instant_dis.png"),
     #endif
     _run_stop_button(this),
     _instant_button(this),
@@ -295,10 +299,13 @@ void SamplingBar::update_sample_rate()
 
 void SamplingBar::set_sampling(bool sampling)
 {
-    if (_instant)
+    if (_instant) {
         _instant_button.setIcon(sampling ? _icon_stop : _icon_instant);
-    else
+        _run_stop_button.setIcon(sampling ? _icon_start_dis : _icon_start);
+    } else {
         _run_stop_button.setIcon(sampling ? _icon_stop : _icon_start);
+        _instant_button.setIcon(sampling ? _icon_instant_dis : _icon_instant);
+    }
 
     if (!sampling) {
         g_usleep(100000);

DSView/pv/toolbars/samplingbar.h

@@ -140,6 +140,8 @@ private:
     QIcon _icon_stop;
     QIcon _icon_start;
     QIcon _icon_instant;
+    QIcon _icon_start_dis;
+    QIcon _icon_instant_dis;
 	QToolButton _run_stop_button;
     QToolButton _instant_button;
 

DSView/pv/view/dsosignal.cpp

@@ -738,9 +738,6 @@ void DsoSignal::paint_mid(QPainter &p, int left, int right)
             _data->get_snapshots();
         if (snapshots.empty())
             return;
-
-        if (_view->session().get_capture_state() == SigSession::Running)
-            _scale = height * 1.0f / 256;
         const boost::shared_ptr<pv::data::DsoSnapshot> &snapshot =
             snapshots.front();