make waveform gradient depth continuously variable. color probably needs adjusting as do color stops to get a pleasing effect at most settings

2 files changed, 25 insertions, 14 deletions

diff --git a/libs/canvas/canvas/wave_view.h b/libs/canvas/canvas/wave_view.h
index 44cc6f6f70..4fd45cff5d 100644
--- a/libs/canvas/canvas/wave_view.h
+++ b/libs/canvas/canvas/wave_view.h
@@ -72,6 +72,8 @@ public:
         void set_clip_color (Color);
         void set_amplitude (double);
         void set_logscaled (bool);
+        void set_gradient_depth (double);
+        double gradient_depth() const { return _gradient_depth; }
         void set_shape (Shape);
         double amplitude() const { return _amplitude; }
         
@@ -80,13 +82,13 @@ public:
 	   set_logscaled_independent()
         */
 
-        static void set_gradient_waveforms (bool);
+        static void set_global_gradient_depth (double);
         static void set_global_logscaled (bool);
         static void set_global_shape (Shape);
     
-        static bool  gradient_waveforms()  { return _gradient_waveforms; }
-        static bool  global_logscaled()  { return _global_logscaled; }
-        static Shape global_shape()  { return _global_shape; }
+        static double  global_gradient_depth()  { return _global_gradient_depth; }
+        static bool    global_logscaled()  { return _global_logscaled; }
+        static Shape   global_shape()  { return _global_shape; }
 
 #ifdef CANVAS_COMPATIBILITY	
 	void*& property_gain_src () {
@@ -154,9 +156,11 @@ private:
         Color  _clip_color;
         bool   _logscaled;
         Shape  _shape;
+        double _gradient_depth;
         double _amplitude;
         bool   _shape_independent;
         bool   _logscaled_independent;
+        bool   _gradient_depth_independent;
 
 	/** The `start' value to use for the region; we can't use the region's
 	 *  value as the crossfade editor needs to alter it.
@@ -167,9 +171,9 @@ private:
        
         PBD::ScopedConnection invalidation_connection;
 
-        static bool _gradient_waveforms;
-        static bool _global_logscaled;
-        static Shape _global_shape;
+        static double _global_gradient_depth;
+        static bool   _global_logscaled;
+        static Shape  _global_shape;
 
         static PBD::Signal0<void> VisualPropertiesChanged;
 
diff --git a/libs/canvas/wave_view.cc b/libs/canvas/wave_view.cc
index f420c73980..6a2661262a 100644
--- a/libs/canvas/wave_view.cc
+++ b/libs/canvas/wave_view.cc
@@ -40,7 +40,7 @@ using namespace std;
 using namespace ARDOUR;
 using namespace ArdourCanvas;
 
-bool WaveView::_gradient_waveforms = true;
+double WaveView::_global_gradient_depth = 0.6;
 bool WaveView::_global_logscaled = false;
 WaveView::Shape WaveView::_global_shape = WaveView::Normal;
 
@@ -60,9 +60,11 @@ WaveView::WaveView (Group* parent, boost::shared_ptr<ARDOUR::AudioRegion> region
 	, _clip_color (0xff0000ff)
 	, _logscaled (_global_logscaled)
 	, _shape (_global_shape)
+	, _gradient_depth (_global_gradient_depth)
 	, _amplitude (1.0)
 	, _shape_independent (false)
 	, _logscaled_independent (false)
+	, _gradient_depth_independent (false)
 	, _region_start (0)
 {
 	VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
@@ -83,6 +85,11 @@ WaveView::handle_visual_property_change ()
 		changed = true;
 	}
 
+	if (!_gradient_depth_independent && (_gradient_depth != global_gradient_depth())) {
+		_gradient_depth = global_gradient_depth();
+		changed = true;
+	}
+	
 	if (changed) {
 		invalidate_image_cache ();
 	}
@@ -482,8 +489,8 @@ WaveView::CacheEntry::image ()
 
 		context->close_path ();
 
-		if (WaveView::gradient_waveforms()) {
-
+		if (_wave_view->gradient_depth() != 0.0) {
+			
 			Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _wave_view->_height));
 			
 			double stops[3];
@@ -508,7 +515,7 @@ WaveView::CacheEntry::image ()
 			double h, s, v;
 			color_to_hsv (_wave_view->_fill_color, h, s, v);
 			/* tone down the saturation */
-			s *= 0.60;
+			s *= 1.0 - _wave_view->gradient_depth();
 			Color center = hsv_to_color (h, s, v, a);
 			color_to_rgba (center, r, g, b, a);
 			gradient->add_color_stop_rgba (stops[1], r, g, b, a);
@@ -553,10 +560,10 @@ WaveView::CacheEntry::clear_image ()
 }
 	    
 void
-WaveView::set_gradient_waveforms (bool yn)
+WaveView::set_global_gradient_depth (double depth)
 {
-	if (_gradient_waveforms != yn) {
-		_gradient_waveforms = yn;
+	if (_global_gradient_depth != depth) {
+		_global_gradient_depth = depth;
 		VisualPropertiesChanged (); /* EMIT SIGNAL */
 	}
 }