From e0bbc0b435eb93ea2e1e2a61453a0639ac10071c Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 12 Jul 2013 17:56:42 +0200
Subject: [PATCH] minor peak-meter performance tweak

* redraw only missing parts of the outside rectangle,
* don't redraw RMS meter if value has not changed
---
 libs/gtkmm2ext/fastmeter.cc          | 17 +++++------------
 libs/gtkmm2ext/gtkmm2ext/fastmeter.h |  1 -
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/libs/gtkmm2ext/fastmeter.cc b/libs/gtkmm2ext/fastmeter.cc
index 4819609878..c0bcb05af5 100644
--- a/libs/gtkmm2ext/fastmeter.cc
+++ b/libs/gtkmm2ext/fastmeter.cc
@@ -53,7 +53,6 @@ FastMeter::FastMeter (long hold, unsigned long dimen, Orientation o, int len,
 {
 	orientation = o;
 	hold_cnt = hold;
-	resized = true;
 	hold_state = 0;
 	bright_hold = false;
 	current_peak = 0;
@@ -353,7 +352,6 @@ FastMeter::on_size_allocate (Gtk::Allocation &alloc)
 	}
 
 	DrawingArea::on_size_allocate (alloc);
-	resized = true;
 }
 
 bool
@@ -372,16 +370,13 @@ FastMeter::vertical_expose (GdkEventExpose* ev)
 
 	cairo_t* cr = gdk_cairo_create (get_window ()->gobj());
 
-	if (resized) {
-		cairo_set_source_rgb (cr, 0, 0, 0); // black
-		rounded_rectangle (cr, 0, 0, pixrect.width + 2, pixheight + 2, 2);
-		cairo_stroke (cr);
-		//cairo_fill (cr);
-		//resized = false;
-	}
 	cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
 	cairo_clip (cr);
 
+	cairo_set_source_rgb (cr, 0, 0, 0); // black
+	rounded_rectangle (cr, 0, 0, pixrect.width + 2, pixheight + 2, 2);
+	cairo_stroke (cr);
+
 	top_of_meter = (gint) floor (pixheight * current_level);
 
 	/* reset the height & origin of the rect that needs to show the pixbuf
@@ -464,11 +459,10 @@ FastMeter::set (float lvl, float peak)
 
 	current_level = lvl;
 
-	if (current_level == old_level && current_peak == old_peak && hold_state == 0) {
+	if (current_level == old_level && current_peak == old_peak && (hold_state == 0 || peak != -1)) {
 		return;
 	}
 
-
 	Glib::RefPtr<Gdk::Window> win;
 
 	if ((win = get_window()) == 0) {
@@ -565,7 +559,6 @@ FastMeter::set_highlight (bool onoff)
 	}
 	highlight = onoff;
 	bgpattern = request_vertical_background (request_width, pixheight, highlight ? _bgh : _bgc, highlight);
-	resized = true;
 	queue_draw ();
 }
 
diff --git a/libs/gtkmm2ext/gtkmm2ext/fastmeter.h b/libs/gtkmm2ext/gtkmm2ext/fastmeter.h
index debe6c1cc7..f065020a57 100644
--- a/libs/gtkmm2ext/gtkmm2ext/fastmeter.h
+++ b/libs/gtkmm2ext/gtkmm2ext/fastmeter.h
@@ -91,7 +91,6 @@ private:
 	float current_level;
 	float current_peak;
 	float current_user_level;
-	bool resized;
 	bool highlight;
 
 	bool vertical_expose (GdkEventExpose*);