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gain_meter.cc

/*
  Copyright (C) 2002 Paul Davis

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <limits.h>

#include <ardour/io.h>
#include <ardour/route.h>
#include <ardour/route_group.h>
#include <ardour/session.h>
#include <ardour/session_route.h>
#include <ardour/dB.h>

#include <gtkmm2ext/utils.h>
#include <gtkmm2ext/fastmeter.h>
#include <gtkmm2ext/stop_signal.h>
#include <gtkmm2ext/barcontroller.h>
#include <midi++/manager.h>
#include <pbd/fastlog.h>

#include "ardour_ui.h"
#include "gain_meter.h"
#include "utils.h"
#include "logmeter.h"
#include "gui_thread.h"
#include "keyboard.h"
#include "public_editor.h"

#include <ardour/session.h>
#include <ardour/route.h>

#include "i18n.h"

using namespace ARDOUR;
using namespace PBD;
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace sigc;
using namespace std;

sigc::signal<void> GainMeterBase::ResetAllPeakDisplays;
sigc::signal<void,RouteGroup*> GainMeterBase::ResetGroupPeakDisplays;

map<string,Glib::RefPtr<Gdk::Pixmap> > GainMeter::metric_pixmaps;
Glib::RefPtr<Gdk::Pixbuf> GainMeter::slider;


void
GainMeter::setup_slider_pix ()
{
      if ((slider = ::get_icon ("fader_belt")) == 0) {
            throw failed_constructor();
      }
}

GainMeterBase::GainMeterBase (Session& s, 
                        const Glib::RefPtr<Gdk::Pixbuf>& pix,
                        bool horizontal)
      : _session (s),
        // 0.781787 is the value needed for gain to be set to 0.
        gain_adjustment (0.781787, 0.0, 1.0, 0.01, 0.1),
        gain_automation_style_button (""),
        gain_automation_state_button ("")
      
{
      using namespace Menu_Helpers;

      ignore_toggle = false;
      meter_menu = 0;
      next_release_selects = false;
      style_changed = true;
      _width = Wide;

      if (horizontal) {
            gain_slider = manage (new HSliderController (pix,
                                               &gain_adjustment,
                                               false));
      } else {
            gain_slider = manage (new VSliderController (pix,
                                               &gain_adjustment,
                                               false));
      }

      level_meter = new LevelMeter(_session);

      gain_slider->signal_button_press_event().connect (mem_fun(*this, &GainMeter::start_gain_touch));
      gain_slider->signal_button_release_event().connect (mem_fun(*this, &GainMeter::end_gain_touch));
      gain_slider->set_name ("GainFader");

      gain_display.set_name ("MixerStripGainDisplay");
      gain_display.set_has_frame (false);
      set_size_request_to_display_given_text (gain_display, "-80.g", 2, 6); /* note the descender */
      gain_display.signal_activate().connect (mem_fun (*this, &GainMeter::gain_activated));
      gain_display.signal_focus_in_event().connect (mem_fun (*this, &GainMeter::gain_focused), false);
      gain_display.signal_focus_out_event().connect (mem_fun (*this, &GainMeter::gain_focused), false);

      peak_display.set_name ("MixerStripPeakDisplay");
//    peak_display.set_has_frame (false);
//    peak_display.set_editable (false);
      set_size_request_to_display_given_text  (peak_display, "-80.g", 2, 6); /* note the descender */
      max_peak = minus_infinity();
      peak_display.set_label (_("-inf"));
      peak_display.unset_flags (Gtk::CAN_FOCUS);

      gain_automation_style_button.set_name ("MixerAutomationModeButton");
      gain_automation_state_button.set_name ("MixerAutomationPlaybackButton");

      ARDOUR_UI::instance()->tooltips().set_tip (gain_automation_state_button, _("Fader automation mode"));
      ARDOUR_UI::instance()->tooltips().set_tip (gain_automation_style_button, _("Fader automation type"));

      gain_automation_style_button.unset_flags (Gtk::CAN_FOCUS);
      gain_automation_state_button.unset_flags (Gtk::CAN_FOCUS);

      gain_automation_state_button.set_size_request(15, 15);
      gain_automation_style_button.set_size_request(15, 15);

      gain_astyle_menu.items().push_back (MenuElem (_("Trim")));
      gain_astyle_menu.items().push_back (MenuElem (_("Abs")));
      
      gain_astate_menu.set_name ("ArdourContextMenu");
      gain_astyle_menu.set_name ("ArdourContextMenu");

      gain_adjustment.signal_value_changed().connect (mem_fun(*this, &GainMeterBase::gain_adjusted));
      peak_display.signal_button_release_event().connect (mem_fun(*this, &GainMeterBase::peak_button_release), false);
      gain_display.signal_key_press_event().connect (mem_fun(*this, &GainMeterBase::gain_key_press), false);

      ResetAllPeakDisplays.connect (mem_fun(*this, &GainMeterBase::reset_peak_display));
      ResetGroupPeakDisplays.connect (mem_fun(*this, &GainMeterBase::reset_group_peak_display));

      UI::instance()->theme_changed.connect (mem_fun(*this, &GainMeterBase::on_theme_changed));
      ColorsChanged.connect (bind(mem_fun (*this, &GainMeterBase::color_handler), false));
      DPIReset.connect (bind(mem_fun (*this, &GainMeterBase::color_handler), true));

}

GainMeterBase::~GainMeterBase ()
{
      if (meter_menu) {
            delete meter_menu;
      }

      if (level_meter) {
            delete level_meter;
      }
}

void
GainMeterBase::set_io (boost::shared_ptr<IO> io)
{
      connections.clear ();

      _io = io;

      level_meter->set_io (_io);
      gain_slider->set_controllable (&_io->gain_control());

      boost::shared_ptr<Route> r;
      
      if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {

            if (!r->hidden()) {

                  using namespace Menu_Helpers;

                  gain_astate_menu.items().clear ();
                  
                  gain_astate_menu.items().push_back (MenuElem (_("Manual"), 
                                                      bind (mem_fun (*_io, &IO::set_gain_automation_state), (AutoState) Off)));
                  gain_astate_menu.items().push_back (MenuElem (_("Play"),
                                                      bind (mem_fun (*_io, &IO::set_gain_automation_state), (AutoState) Play)));
                  gain_astate_menu.items().push_back (MenuElem (_("Write"),
                                                      bind (mem_fun (*_io, &IO::set_gain_automation_state), (AutoState) Write)));
                  gain_astate_menu.items().push_back (MenuElem (_("Touch"),
                                                      bind (mem_fun (*_io, &IO::set_gain_automation_state), (AutoState) Touch)));
                  
                  connections.push_back (gain_automation_style_button.signal_button_press_event().connect (mem_fun(*this, &GainMeterBase::gain_automation_style_button_event), false));
                  connections.push_back (gain_automation_state_button.signal_button_press_event().connect (mem_fun(*this, &GainMeterBase::gain_automation_state_button_event), false));
                  
                  connections.push_back (r->gain_automation_curve().automation_state_changed.connect (mem_fun(*this, &GainMeterBase::gain_automation_state_changed)));
                  connections.push_back (r->gain_automation_curve().automation_style_changed.connect (mem_fun(*this, &GainMeterBase::gain_automation_style_changed)));
                  
                  gain_automation_state_changed ();
            }
      }

      connections.push_back (_io->gain_changed.connect (mem_fun(*this, &GainMeterBase::gain_changed)));

      gain_changed (0);
      show_gain ();

      update_gain_sensitive ();
}     

void
GainMeterBase::hide_all_meters ()
{
      level_meter->hide_meters();
}

void
GainMeter::hide_all_meters ()
{
      bool remove_metric_area = false;

      GainMeterBase::hide_all_meters ();

      if (remove_metric_area) {
            if (meter_metric_area.get_parent()) {
                  level_meter->remove (meter_metric_area);
            }
      }
}

void
GainMeterBase::setup_meters (int len)
{
      level_meter->setup_meters(len, 5);
}

void 
GainMeter::setup_meters (int len)
{
      if (!meter_metric_area.get_parent()) {
            level_meter->pack_end (meter_metric_area, false, false);
            meter_metric_area.show_all ();
      }
      GainMeterBase::setup_meters (len);
}

bool
GainMeterBase::gain_key_press (GdkEventKey* ev)
{
      if (key_is_legal_for_numeric_entry (ev->keyval)) {
            /* drop through to normal handling */
            return false;
      }
      /* illegal key for gain entry */
      return true;
}

bool
GainMeterBase::peak_button_release (GdkEventButton* ev)
{
      /* reset peak label */

      if (ev->button == 1 && Keyboard::modifier_state_equals (ev->state, Keyboard::PrimaryModifier|Keyboard::TertiaryModifier)) {
            ResetAllPeakDisplays ();
      } else if (ev->button == 1 && Keyboard::modifier_state_equals (ev->state, Keyboard::PrimaryModifier)) {
            boost::shared_ptr<Route> r;

            if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
                  ResetGroupPeakDisplays (r->mix_group());
            }
      } else {
            reset_peak_display ();
      }

      return true;
}

void
GainMeterBase::reset_peak_display ()
{
      boost::shared_ptr<Route> r;

      if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
            r->reset_max_peak_meters();
      }

      level_meter->clear_meters();
      max_peak = -INFINITY;
      peak_display.set_label (_("-Inf"));
      peak_display.set_name ("MixerStripPeakDisplay");
}

void
GainMeterBase::reset_group_peak_display (RouteGroup* group)
{
      boost::shared_ptr<Route> r;
      
      if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
            if (group == r->mix_group()) {
                  reset_peak_display ();
            }
      }
}

void
GainMeterBase::popup_meter_menu (GdkEventButton *ev)
{
      using namespace Menu_Helpers;

      if (meter_menu == 0) {
            meter_menu = new Gtk::Menu;
            MenuList& items = meter_menu->items();

            items.push_back (MenuElem ("-inf .. +0dBFS"));
            items.push_back (MenuElem ("-10dB .. +0dBFS"));
            items.push_back (MenuElem ("-4 .. +0dBFS"));
            items.push_back (SeparatorElem());
            items.push_back (MenuElem ("-inf .. -2dBFS"));
            items.push_back (MenuElem ("-10dB .. -2dBFS"));
            items.push_back (MenuElem ("-4 .. -2dBFS"));
      }

      meter_menu->popup (1, ev->time);
}

bool
GainMeterBase::gain_focused (GdkEventFocus* ev)
{
      if (ev->in) {
            gain_display.select_region (0, -1);
      } else {
            gain_display.select_region (0, 0);
      }
      return false;
}

void
GainMeterBase::gain_activated ()
{
      float f;

      if (sscanf (gain_display.get_text().c_str(), "%f", &f) == 1) {

            /* clamp to displayable values */

            f = min (f, 6.0f);

            _io->set_gain (dB_to_coefficient(f), this);

            if (gain_display.has_focus()) {
                  PublicEditor::instance().reset_focus();
            }
      }
}

void
GainMeterBase::show_gain ()
{
      char buf[32];

      float v = gain_adjustment.get_value();
      
      if (v == 0.0) {
            strcpy (buf, _("-inf"));
      } else {
            snprintf (buf, 32, "%.1f", accurate_coefficient_to_dB (slider_position_to_gain (v)));
      }
      
      gain_display.set_text (buf);
}

void
GainMeterBase::gain_adjusted ()
{
      if (!ignore_toggle) {
            _io->set_gain (slider_position_to_gain (gain_adjustment.get_value()), this);
      }
      show_gain ();
}

void
GainMeterBase::effective_gain_display ()
{
      gfloat value = gain_to_slider_position (_io->effective_gain());

      if (gain_adjustment.get_value() != value) {
            ignore_toggle = true; 
            gain_adjustment.set_value (value);
            ignore_toggle = false;
      }
}

void
GainMeterBase::gain_changed (void *src)
{
      Gtkmm2ext::UI::instance()->call_slot (mem_fun(*this, &GainMeterBase::effective_gain_display));
}

void
GainMeterBase::set_meter_strip_name (const char * name)
{
      meter_metric_area.set_name (name);
      style_changed = true;
}

void
GainMeterBase::set_fader_name (const char * name)
{
      gain_slider->set_name (name);
}

void
GainMeterBase::update_gain_sensitive ()
{
      static_cast<Gtkmm2ext::SliderController*>(gain_slider)->set_sensitive (!(_io->gain_automation_state() & Play));
}


static MeterPoint
next_meter_point (MeterPoint mp)
{
      switch (mp) {
      case MeterInput:
            return MeterPreFader;
            break;
            
      case MeterPreFader:
            return MeterPostFader;
            break;
            
      case MeterPostFader:
            return MeterInput;
            break;
      }
      /*NOTREACHED*/
      return MeterInput;
}

gint
GainMeterBase::meter_press(GdkEventButton* ev)
{
      boost::shared_ptr<Route> _route;

      wait_for_release = false;
      
      if ((_route = boost::dynamic_pointer_cast<Route>(_io)) == 0) {
            return FALSE;
      }

      if (!ignore_toggle) {

            if (Keyboard::is_context_menu_event (ev)) {
                  
                  // no menu at this time.

            } else {

                  if (Keyboard::is_button2_event(ev)) {

                        // Primary-button2 click is the midi binding click
                        // button2-click is "momentary"
                        
                        if (!Keyboard::modifier_state_equals (ev->state, Keyboard::ModifierMask (Keyboard::PrimaryModifier))) {
                              wait_for_release = true;
                              old_meter_point = _route->meter_point ();
                        }
                  }

                  if (ev->button == 1 || Keyboard::is_button2_event (ev)) {

                        if (Keyboard::modifier_state_equals (ev->state, Keyboard::ModifierMask (Keyboard::PrimaryModifier|Keyboard::TertiaryModifier))) {

                              /* Primary+Tertiary-click applies change to all routes */

                              _session.begin_reversible_command (_("meter point change"));
                                        Session::GlobalMeteringStateCommand *cmd = new Session::GlobalMeteringStateCommand (_session, this);
                              _session.foreach_route (this, &GainMeterBase::set_meter_point, next_meter_point (_route->meter_point()));
                                        cmd->mark();
                              _session.add_command (cmd);
                              _session.commit_reversible_command ();
                              
                              
                        } else if (Keyboard::modifier_state_equals (ev->state, Keyboard::PrimaryModifier)) {

                              /* Primary-click: solo mix group.
                                 NOTE: Primary-button2 is MIDI learn.
                              */
                              
                              if (ev->button == 1) {
                                    _session.begin_reversible_command (_("meter point change"));
                                    Session::GlobalMeteringStateCommand *cmd = new Session::GlobalMeteringStateCommand (_session, this);
                                    set_mix_group_meter_point (*_route, next_meter_point (_route->meter_point()));
                                    cmd->mark();
                                    _session.add_command (cmd);
                                    _session.commit_reversible_command ();
                              }
                              
                        } else {
                              
                              /* click: change just this route */

                              // XXX no undo yet
                              
                              _route->set_meter_point (next_meter_point (_route->meter_point()), this);
                        }
                  }
            }
      }

      return true;

}

gint
GainMeterBase::meter_release(GdkEventButton* ev)
{
      if(!ignore_toggle){
            if (wait_for_release){
                  wait_for_release = false;
                  
                  boost::shared_ptr<Route> r;
                  
                  if ((r = boost::dynamic_pointer_cast<Route>(_io)) != 0) {
                        set_meter_point (*r, old_meter_point);
                  }
            }
      }

      return true;
}

void
GainMeterBase::set_meter_point (Route& route, MeterPoint mp)
{
      route.set_meter_point (mp, this);
}

void
GainMeterBase::set_mix_group_meter_point (Route& route, MeterPoint mp)
{
      RouteGroup* mix_group;

      if((mix_group = route.mix_group()) != 0){
            mix_group->apply (&Route::set_meter_point, mp, this);
      } else {
            route.set_meter_point (mp, this);
      }
}

void
GainMeterBase::meter_point_clicked ()
{
      boost::shared_ptr<Route> r;

      if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
            /* WHAT? */
      }
}

gint
GainMeterBase::start_gain_touch (GdkEventButton* ev)
{
      _io->start_gain_touch ();
      return FALSE;
}

gint
GainMeterBase::end_gain_touch (GdkEventButton* ev)
{
      _io->end_gain_touch ();
      return FALSE;
}

gint
GainMeterBase::gain_automation_state_button_event (GdkEventButton *ev)
{
      if (ev->type == GDK_BUTTON_RELEASE) {
            return TRUE;
      }
      
      switch (ev->button) {
            case 1:
                  gain_astate_menu.popup (1, ev->time);
                  break;
            default:
                  break;
      }

      return TRUE;
}

gint
GainMeterBase::gain_automation_style_button_event (GdkEventButton *ev)
{
      if (ev->type == GDK_BUTTON_RELEASE) {
            return TRUE;
      }

      switch (ev->button) {
      case 1:
            gain_astyle_menu.popup (1, ev->time);
            break;
      default:
            break;
      }
      return TRUE;
}

string
GainMeterBase::astate_string (AutoState state)
{
      return _astate_string (state, false);
}

string
GainMeterBase::short_astate_string (AutoState state)
{
      return _astate_string (state, true);
}

string
GainMeterBase::_astate_string (AutoState state, bool shrt)
{
      string sstr;

      switch (state) {
      case Off:
            sstr = (shrt ? "M" : _("M"));
            break;
      case Play:
            sstr = (shrt ? "P" : _("P"));
            break;
      case Touch:
            sstr = (shrt ? "T" : _("T"));
            break;
      case Write:
            sstr = (shrt ? "W" : _("W"));
            break;
      }

      return sstr;
}

string
GainMeterBase::astyle_string (AutoStyle style)
{
      return _astyle_string (style, false);
}

string
GainMeterBase::short_astyle_string (AutoStyle style)
{
      return _astyle_string (style, true);
}

string
GainMeterBase::_astyle_string (AutoStyle style, bool shrt)
{
      if (style & Trim) {
            return _("Trim");
      } else {
              /* XXX it might different in different languages */

            return (shrt ? _("Abs") : _("Abs"));
      }
}

void
GainMeterBase::gain_automation_style_changed ()
{
      switch (_width) {
      case Wide:
              gain_automation_style_button.set_label (astyle_string(_io->gain_automation_curve().automation_style()));
            break;
      case Narrow:
            gain_automation_style_button.set_label  (short_astyle_string(_io->gain_automation_curve().automation_style()));
            break;
      }
}

void
GainMeterBase::gain_automation_state_changed ()
{
      ENSURE_GUI_THREAD(mem_fun(*this, &GainMeterBase::gain_automation_state_changed));
      
      bool x;

      switch (_width) {
      case Wide:
            gain_automation_state_button.set_label (astate_string(_io->gain_automation_curve().automation_state()));
            break;
      case Narrow:
            gain_automation_state_button.set_label (short_astate_string(_io->gain_automation_curve().automation_state()));
            break;
      }

      x = (_io->gain_automation_state() != Off);
      
      if (gain_automation_state_button.get_active() != x) {
            ignore_toggle = true;
            gain_automation_state_button.set_active (x);
            ignore_toggle = false;
      }

      update_gain_sensitive ();
      
      /* start watching automation so that things move */
      
      gain_watching.disconnect();

      if (x) {
            gain_watching = ARDOUR_UI::RapidScreenUpdate.connect (mem_fun (*this, &GainMeterBase::effective_gain_display));
      }
}

void
GainMeterBase::update_meters()
{
      char buf[32];
      float mpeak = level_meter->update_meters();

      if (mpeak > max_peak) {
            max_peak = mpeak;
            if (mpeak <= -200.0f) {
                  peak_display.set_label (_("-inf"));
            } else {
                  snprintf (buf, sizeof(buf), "%.1f", mpeak);
                  peak_display.set_label (buf);
            }

            if (mpeak >= 0.0f) {
                  peak_display.set_name ("MixerStripPeakDisplayPeak");
            }
      }
}

void GainMeterBase::color_handler(bool dpi)
{
      color_changed = true;
      dpi_changed = (dpi) ? true : false;
      setup_meters();
}

void
GainMeterBase::set_width (Width w, int len)
{
      _width = w;
      level_meter->setup_meters (len);
}


void
GainMeterBase::on_theme_changed()
{
      style_changed = true;
}

GainMeter::GainMeter (Session& s)
      : GainMeterBase (s, slider, false)
{
      gain_display_box.set_homogeneous (true);
      gain_display_box.set_spacing (2);
      gain_display_box.pack_start (gain_display, true, true);

      meter_metric_area.set_name ("AudioTrackMetrics");
      set_size_request_to_display_given_text (meter_metric_area, "-50", 0, 0);

      gain_automation_style_button.set_name ("MixerAutomationModeButton");
      gain_automation_state_button.set_name ("MixerAutomationPlaybackButton");

      ARDOUR_UI::instance()->tooltips().set_tip (gain_automation_state_button, _("Fader automation mode"));
      ARDOUR_UI::instance()->tooltips().set_tip (gain_automation_style_button, _("Fader automation type"));

      gain_automation_style_button.unset_flags (Gtk::CAN_FOCUS);
      gain_automation_state_button.unset_flags (Gtk::CAN_FOCUS);

      gain_automation_state_button.set_size_request(15, 15);
      gain_automation_style_button.set_size_request(15, 15);

      HBox* fader_centering_box = manage (new HBox);
      fader_centering_box->pack_start (*gain_slider, true, false);

      fader_vbox = manage (new Gtk::VBox());
      fader_vbox->set_spacing (0);
      fader_vbox->pack_start (*fader_centering_box, false, false, 0);

      hbox.set_spacing (2);
      hbox.pack_start (*fader_vbox, true, true);

      set_spacing (2);

      pack_start (gain_display_box, Gtk::PACK_SHRINK);
      pack_start (hbox, Gtk::PACK_SHRINK);

      meter_metric_area.signal_expose_event().connect (mem_fun(*this, &GainMeter::meter_metrics_expose));
}

void
GainMeter::set_io (boost::shared_ptr<IO> io)
{
      if (level_meter->get_parent()) {
            hbox.remove (*level_meter);
      }

      if (peak_display.get_parent()) {
            gain_display_box.remove (peak_display);
      }

      if (gain_automation_state_button.get_parent()) {
            fader_vbox->remove (gain_automation_state_button);
      }

      GainMeterBase::set_io (io);

      boost::shared_ptr<Route> r;

      if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
            
            /* 
               if we have a non-hidden route (ie. we're not the click or the auditioner), 
               pack some route-dependent stuff.
            */

            gain_display_box.pack_end (peak_display, true, true);
            hbox.pack_end (*level_meter, true, true);

            if (!r->hidden()) {
                  fader_vbox->pack_start (gain_automation_state_button, false, false, 0);
            }
      }
}

int
GainMeter::get_gm_width ()
{
      Gtk::Requisition sz;
      hbox.size_request (sz);
      return sz.width;
}

Glib::RefPtr<Gdk::Pixmap>
GainMeter::render_metrics (Gtk::Widget& w)
{
      Glib::RefPtr<Gdk::Window> win (w.get_window());
      Glib::RefPtr<Gdk::GC> fg_gc (w.get_style()->get_fg_gc (Gtk::STATE_NORMAL));
      Glib::RefPtr<Gdk::GC> bg_gc (w.get_style()->get_bg_gc (Gtk::STATE_NORMAL));
      gint width, height;
      int  db_points[] = { -50, -40, -20, -30, -10, -3, 0, 4 };
      char buf[32];

      win->get_size (width, height);
      
      Glib::RefPtr<Gdk::Pixmap> pixmap = Gdk::Pixmap::create (win, width, height);

      metric_pixmaps[w.get_name()] = pixmap;

      pixmap->draw_rectangle (bg_gc, true, 0, 0, width, height);

      Glib::RefPtr<Pango::Layout> layout = w.create_pango_layout("");

      for (uint32_t i = 0; i < sizeof (db_points)/sizeof (db_points[0]); ++i) {

            float fraction = log_meter (db_points[i]);
            gint pos = height - (gint) floor (height * fraction);

            snprintf (buf, sizeof (buf), "%d", abs (db_points[i]));

            layout->set_text (buf);

            /* we want logical extents, not ink extents here */

            int width, height;
            layout->get_pixel_size (width, height);

            pixmap->draw_line (fg_gc, 0, pos, 4, pos);
            pixmap->draw_layout (fg_gc, 6, pos - (height/2), layout);
      }

      return pixmap;
}

gint
GainMeter::meter_metrics_expose (GdkEventExpose *ev)
{
      static Glib::RefPtr<Gtk::Style> meter_style;
      if (style_changed) {
            meter_style = meter_metric_area.get_style();
      }
      Glib::RefPtr<Gdk::Window> win (meter_metric_area.get_window());
      Glib::RefPtr<Gdk::GC> bg_gc (meter_style->get_bg_gc (Gtk::STATE_INSENSITIVE));
      GdkRectangle base_rect;
      GdkRectangle draw_rect;
      gint width, height;

      win->get_size (width, height);
      
      base_rect.width = width;
      base_rect.height = height;
      base_rect.x = 0;
      base_rect.y = 0;

      Glib::RefPtr<Gdk::Pixmap> pixmap;
      std::map<string,Glib::RefPtr<Gdk::Pixmap> >::iterator i = metric_pixmaps.find (meter_metric_area.get_name());

      if (i == metric_pixmaps.end() || style_changed || dpi_changed) {
            pixmap = render_metrics (meter_metric_area);
      } else {
            pixmap = i->second;
      }

      gdk_rectangle_intersect (&ev->area, &base_rect, &draw_rect);
      win->draw_drawable (bg_gc, pixmap, draw_rect.x, draw_rect.y, draw_rect.x, draw_rect.y, draw_rect.width, draw_rect.height);
      style_changed = false;
      return true;
}


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