DesktopStreamer: new slider to adjust the JPEG quality in advanced settings

CMakeLists.txt

@@ -4,7 +4,7 @@
 #                          Daniel Nachbaur <daniel.nachbaur@epfl.ch>
 
 cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
-project(Deflect VERSION 0.12.0)
+project(Deflect VERSION 0.12.1)
 set(Deflect_VERSION_ABI 5)
 
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/CMake

apps/DesktopStreamer/MainWindow.cpp

@@ -48,6 +48,7 @@
 #include <QMessageBox>
 #include <QPainter>
 #include <QScreen>
+#include <QToolTip>
 
 #include <algorithm>
 #include <cmath>
@@ -109,6 +110,11 @@ MainWindow::MainWindow()
     connect( _remoteControlCheckBox, &QCheckBox::clicked,
              this, &MainWindow::_onStreamEventsBoxClicked );
 
+    connect( _qualitySlider, &QSlider::valueChanged, []( const int value )
+    {
+        QToolTip::showText( QCursor::pos(), QString::number( value ) + "/100" );
+    });
+
     connect( _actionAdvancedSettings, &QAction::triggered,
              this, &MainWindow::_showAdvancedSettings );
 
@@ -242,6 +248,9 @@ void MainWindow::_showAdvancedSettings( const bool visible )
 
     _streamIdLineEdit->setVisible( visible );
     _streamIdLabel->setVisible( visible );
+
+    _qualitySlider->setVisible( visible );
+    _qualityLabel->setVisible( visible );
 }
 
 void MainWindow::_updateStreams()
@@ -359,12 +368,12 @@ void MainWindow::_shareDesktopUpdate()
 
     for( auto i = _streams.begin(); i != _streams.end(); )
     {
-        const std::string& error = i->second->update();
+        const auto error = i->second->update( _qualitySlider->value( ));
         if( error.empty( ))
             ++i;
         else
         {
-            _statusbar->showMessage( QString( error.c_str( )));
+            _statusbar->showMessage( QString::fromStdString( error ));
             i = _streams.erase( i );
         }
     }

apps/DesktopStreamer/MainWindow.ui

@@ -234,6 +234,29 @@
         </property>
        </widget>
       </item>
+      <item row="6" column="0">
+       <widget class="QLabel" name="_qualityLabel">
+        <property name="text">
+         <string>JPEG quality</string>
+        </property>
+       </widget>
+      </item>
+      <item row="6" column="1">
+       <widget class="QSlider" name="_qualitySlider">
+        <property name="minimum">
+         <number>1</number>
+        </property>
+        <property name="maximum">
+         <number>100</number>
+        </property>
+        <property name="value">
+         <number>75</number>
+        </property>
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+       </widget>
+      </item>
      </layout>
     </item>
    </layout>

apps/DesktopStreamer/Stream.cpp

@@ -120,7 +120,7 @@ bool processEvents( const bool interact )
     return true;
 }
 
-std::string update()
+std::string update( const int quality )
 {
     QPixmap pixmap;
 
@@ -169,6 +169,7 @@ std::string update()
                                         image.width(), image.height(),
                                         deflect::BGRA );
     deflectImage.compressionPolicy = deflect::COMPRESSION_ON;
+    deflectImage.compressionQuality = std::max( 1, std::min( quality, 100 ));
 
     if( !_stream.send( deflectImage ) || !_stream.finishFrame( ))
         return "Streaming failure, connection closed";
@@ -279,9 +280,9 @@ Stream::Stream( const MainWindow& parent, const QPersistentModelIndex window,
 Stream::~Stream()
 {}
 
-std::string Stream::update()
+std::string Stream::update( const int quality )
 {
-    return _impl->update();
+    return _impl->update( quality );
 }
 
 bool Stream::processEvents( const bool interact )

apps/DesktopStreamer/Stream.h

@@ -57,9 +57,10 @@ class Stream : public deflect::Stream
 
     /**
      * Send an update to the server.
+     * @param quality the quality setting for compression [1; 100]
      * @return an empty string on success, the error message otherwise.
      */
-    std::string update();
+    std::string update( int quality );
 
     /**
      * Process all pending events.

doc/Changelog.md

@@ -3,6 +3,11 @@ Changelog {#Changelog}
 
 ## Deflect 0.12
 
+### 0.12.1 (git master)
+
+* [145](https://github.com/BlueBrain/Deflect/pull/145):
+  DesktopStreamer: new slider to adjust the JPEG quality in advanced settings.
+
 ### 0.12.0 (09-12-2016)
 
 * [143](https://github.com/BlueBrain/Deflect/pull/143):