Adding posterize filter to effects dialog

Adding posterize filter to Color fun tab of Video effects tab of Effects
and filters dialog
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/components/extended_panels.cpp

@@ -138,6 +138,9 @@ ExtVideo::ExtVideo( intf_thread_t *_p_intf, QTabWidget *_parent ) :
     SETUP_VFILTER( extract )
     SETUP_VFILTER_OPTION( extractComponentText, textChanged( const QString& ) )
 
+    SETUP_VFILTER( posterize )
+    SETUP_VFILTER_OPTION( posterizeLevelSpin, valueChanged( int ) )
+
     SETUP_VFILTER( colorthres )
     SETUP_VFILTER_OPTION( colorthresColorText, textChanged( const QString& ) )
     SETUP_VFILTER_OPTION( colorthresSaturationthresSlider, valueChanged( int ) )

modules/gui/qt4/ui/video_effects.ui

@@ -523,7 +523,7 @@
       </property>
      </widget>
     </item>
-    <item row="0" column="0" rowspan="2">
+    <item row="0" column="0" rowspan="3">
      <widget class="QGroupBox" name="colorthresEnable">
       <property name="title">
        <string>Color threshold</string>
@@ -580,6 +580,41 @@
       </layout>
      </widget>
     </item>
+    <item row="2" column="1">
+     <widget class="QGroupBox" name="posterizeEnable">
+      <property name="title">
+       <string>Posterize</string>
+      </property>
+      <property name="checkable">
+       <bool>true</bool>
+      </property>
+      <property name="checked">
+       <bool>false</bool>
+      </property>
+      <layout class="QGridLayout" name="gridLayout_3">
+       <item row="0" column="0">
+        <widget class="QLabel" name="label_33">
+         <property name="text">
+          <string>Posterize level</string>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="1">
+        <widget class="QSpinBox" name="posterizeLevelSpin">
+         <property name="minimum">
+          <number>2</number>
+         </property>
+         <property name="maximum">
+          <number>256</number>
+         </property>
+         <property name="value">
+          <number>3</number>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </item>
    </layout>
   </widget>
   <widget class="QWidget" name="tab_7">