Mixer: Try harder to avoid drawing meters more than necessary.

mixer/src/DPM.H

@@ -31,6 +31,8 @@ class DPM : public Meter
     int _pixels_per_segment;
     int _last_drawn_hi_segment;
 
+    float _value;
+
     int pos ( float v )
         {
             return deflection( v ) * _segments;
@@ -63,7 +65,21 @@ public:
 
     DPM ( int X, int Y, int W, int H,  const char *L = 0 );
 
-//    void value ( float v ) { if ( pos( v ) != pos( value() ) )  redraw(); Meter::value( v ) }
+    void value ( float v )
+        {
+            if ( _value != v )
+            {
+                if ( pos( v ) != pos( _value ) ) 
+                    Meter::value( v );
+            }
+
+            _value = v;
+        }
+
+    float value ( void ) const
+        {
+            return _value;
+        }
 
     void pixels_per_segment ( int v ) { _pixels_per_segment = v; }
 

mixer/src/Meter.H

@@ -81,7 +81,7 @@ public:
 
     virtual ~Meter ( ) { }
 
-    void value ( float v )
+    virtual void value ( float v )
         {
             damage( FL_DAMAGE_USER1 );
 
@@ -91,7 +91,7 @@ public:
                 _peak = _value;
         }
 
-    float value ( void ) const { return _value; }
+    virtual float value ( void ) const { return _value; }
     float peak ( void ) const { return _peak; }
 
     void reset ( void ) { _peak = -80.0f; redraw(); }

mixer/src/Mixer.C

@@ -371,9 +371,9 @@ Mixer::Mixer ( int X, int Y, int W, int H, const char *L ) :
         o->add( "_&Options/&Display/&Colors/&Light", 0, 0, 0, FL_MENU_RADIO  );
         o->add( "_&Options/&Display/&Colors/&Gray", 0, 0, 0, FL_MENU_RADIO  );
         o->add( "_&Options/&Display/&Colors/&System", 0, 0, 0, FL_MENU_RADIO );
-        o->add( "_&Options/&Display/&Knobs/&Arc", 0, 0, 0, FL_MENU_RADIO | FL_MENU_VALUE  );
+        o->add( "_&Options/&Display/&Knobs/&Arc", 0, 0, 0, FL_MENU_RADIO   );
         o->add( "_&Options/&Display/&Knobs/&Burnished", 0, 0, 0, FL_MENU_RADIO );
-        o->add( "_&Options/&Display/&Knobs/&Plastic", 0, 0, 0, FL_MENU_RADIO );
+        o->add( "_&Options/&Display/&Knobs/&Plastic", 0, 0, 0, FL_MENU_RADIO | FL_MENU_VALUE );
         o->add( "_&Options/&Display/&Colors/&System", 0, 0, 0, FL_MENU_RADIO );
         o->add( "&Help/&Manual" );
         o->add( "&Help/&About" );