accurate dB/log patch from Carl, back-ported from 3.0
[ardour2.git] / gtk2_ardour / gain_meter.cc
blob3d0d9be1aa48b2e8c0112c0c18e3dae39e992100
1 /*
2 Copyright (C) 2002 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include <limits.h>
22 #include <ardour/io.h>
23 #include <ardour/route.h>
24 #include <ardour/route_group.h>
25 #include <ardour/session.h>
26 #include <ardour/session_route.h>
27 #include <ardour/dB.h>
29 #include <gtkmm2ext/utils.h>
30 #include <gtkmm2ext/fastmeter.h>
31 #include <gtkmm2ext/stop_signal.h>
32 #include <gtkmm2ext/barcontroller.h>
33 #include <midi++/manager.h>
34 #include <pbd/fastlog.h>
36 #include "ardour_ui.h"
37 #include "gain_meter.h"
38 #include "utils.h"
39 #include "logmeter.h"
40 #include "gui_thread.h"
41 #include "keyboard.h"
42 #include "public_editor.h"
44 #include <ardour/session.h>
45 #include <ardour/route.h>
47 #include "i18n.h"
49 using namespace ARDOUR;
50 using namespace PBD;
51 using namespace Gtkmm2ext;
52 using namespace Gtk;
53 using namespace sigc;
54 using namespace std;
56 sigc::signal<void> GainMeterBase::ResetAllPeakDisplays;
57 sigc::signal<void,RouteGroup*> GainMeterBase::ResetGroupPeakDisplays;
59 map<string,Glib::RefPtr<Gdk::Pixmap> > GainMeter::metric_pixmaps;
60 Glib::RefPtr<Gdk::Pixbuf> GainMeter::slider;
63 void
64 GainMeter::setup_slider_pix ()
66 if ((slider = ::get_icon ("fader_belt")) == 0) {
67 throw failed_constructor();
71 GainMeterBase::GainMeterBase (Session& s,
72 const Glib::RefPtr<Gdk::Pixbuf>& pix,
73 bool horizontal)
74 : _session (s),
75 // 0.781787 is the value needed for gain to be set to 0.
76 gain_adjustment (0.781787, 0.0, 1.0, 0.01, 0.1),
77 gain_automation_style_button (""),
78 gain_automation_state_button ("")
81 using namespace Menu_Helpers;
83 ignore_toggle = false;
84 meter_menu = 0;
85 next_release_selects = false;
86 style_changed = true;
87 _width = Wide;
89 if (horizontal) {
90 gain_slider = manage (new HSliderController (pix,
91 &gain_adjustment,
92 false));
93 } else {
94 gain_slider = manage (new VSliderController (pix,
95 &gain_adjustment,
96 false));
99 level_meter = new LevelMeter(_session);
101 gain_slider->signal_button_press_event().connect (mem_fun(*this, &GainMeter::start_gain_touch));
102 gain_slider->signal_button_release_event().connect (mem_fun(*this, &GainMeter::end_gain_touch));
103 gain_slider->set_name ("GainFader");
105 gain_display.set_name ("MixerStripGainDisplay");
106 gain_display.set_has_frame (false);
107 set_size_request_to_display_given_text (gain_display, "-80.g", 2, 6); /* note the descender */
108 gain_display.signal_activate().connect (mem_fun (*this, &GainMeter::gain_activated));
109 gain_display.signal_focus_in_event().connect (mem_fun (*this, &GainMeter::gain_focused), false);
110 gain_display.signal_focus_out_event().connect (mem_fun (*this, &GainMeter::gain_focused), false);
112 peak_display.set_name ("MixerStripPeakDisplay");
113 // peak_display.set_has_frame (false);
114 // peak_display.set_editable (false);
115 set_size_request_to_display_given_text (peak_display, "-80.g", 2, 6); /* note the descender */
116 max_peak = minus_infinity();
117 peak_display.set_label (_("-inf"));
118 peak_display.unset_flags (Gtk::CAN_FOCUS);
120 gain_automation_style_button.set_name ("MixerAutomationModeButton");
121 gain_automation_state_button.set_name ("MixerAutomationPlaybackButton");
123 ARDOUR_UI::instance()->tooltips().set_tip (gain_automation_state_button, _("Fader automation mode"));
124 ARDOUR_UI::instance()->tooltips().set_tip (gain_automation_style_button, _("Fader automation type"));
126 gain_automation_style_button.unset_flags (Gtk::CAN_FOCUS);
127 gain_automation_state_button.unset_flags (Gtk::CAN_FOCUS);
129 gain_automation_state_button.set_size_request(15, 15);
130 gain_automation_style_button.set_size_request(15, 15);
132 gain_astyle_menu.items().push_back (MenuElem (_("Trim")));
133 gain_astyle_menu.items().push_back (MenuElem (_("Abs")));
135 gain_astate_menu.set_name ("ArdourContextMenu");
136 gain_astyle_menu.set_name ("ArdourContextMenu");
138 gain_adjustment.signal_value_changed().connect (mem_fun(*this, &GainMeterBase::gain_adjusted));
139 peak_display.signal_button_release_event().connect (mem_fun(*this, &GainMeterBase::peak_button_release), false);
140 gain_display.signal_key_press_event().connect (mem_fun(*this, &GainMeterBase::gain_key_press), false);
142 ResetAllPeakDisplays.connect (mem_fun(*this, &GainMeterBase::reset_peak_display));
143 ResetGroupPeakDisplays.connect (mem_fun(*this, &GainMeterBase::reset_group_peak_display));
145 UI::instance()->theme_changed.connect (mem_fun(*this, &GainMeterBase::on_theme_changed));
146 ColorsChanged.connect (bind(mem_fun (*this, &GainMeterBase::color_handler), false));
147 DPIReset.connect (bind(mem_fun (*this, &GainMeterBase::color_handler), true));
151 GainMeterBase::~GainMeterBase ()
153 if (meter_menu) {
154 delete meter_menu;
157 if (level_meter) {
158 delete level_meter;
162 void
163 GainMeterBase::set_io (boost::shared_ptr<IO> io)
165 connections.clear ();
167 _io = io;
169 level_meter->set_io (_io);
170 gain_slider->set_controllable (&_io->gain_control());
172 boost::shared_ptr<Route> r;
174 if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
176 if (!r->hidden()) {
178 using namespace Menu_Helpers;
180 gain_astate_menu.items().clear ();
182 gain_astate_menu.items().push_back (MenuElem (_("Manual"),
183 bind (mem_fun (*_io, &IO::set_gain_automation_state), (AutoState) Off)));
184 gain_astate_menu.items().push_back (MenuElem (_("Play"),
185 bind (mem_fun (*_io, &IO::set_gain_automation_state), (AutoState) Play)));
186 gain_astate_menu.items().push_back (MenuElem (_("Write"),
187 bind (mem_fun (*_io, &IO::set_gain_automation_state), (AutoState) Write)));
188 gain_astate_menu.items().push_back (MenuElem (_("Touch"),
189 bind (mem_fun (*_io, &IO::set_gain_automation_state), (AutoState) Touch)));
191 connections.push_back (gain_automation_style_button.signal_button_press_event().connect (mem_fun(*this, &GainMeterBase::gain_automation_style_button_event), false));
192 connections.push_back (gain_automation_state_button.signal_button_press_event().connect (mem_fun(*this, &GainMeterBase::gain_automation_state_button_event), false));
194 connections.push_back (r->gain_automation_curve().automation_state_changed.connect (mem_fun(*this, &GainMeterBase::gain_automation_state_changed)));
195 connections.push_back (r->gain_automation_curve().automation_style_changed.connect (mem_fun(*this, &GainMeterBase::gain_automation_style_changed)));
197 gain_automation_state_changed ();
201 connections.push_back (_io->gain_changed.connect (mem_fun(*this, &GainMeterBase::gain_changed)));
203 gain_changed (0);
204 show_gain ();
206 update_gain_sensitive ();
209 void
210 GainMeterBase::hide_all_meters ()
212 level_meter->hide_meters();
215 void
216 GainMeter::hide_all_meters ()
218 bool remove_metric_area = false;
220 GainMeterBase::hide_all_meters ();
222 if (remove_metric_area) {
223 if (meter_metric_area.get_parent()) {
224 level_meter->remove (meter_metric_area);
229 void
230 GainMeterBase::setup_meters (int len)
232 level_meter->setup_meters(len, 5);
235 void
236 GainMeter::setup_meters (int len)
238 if (!meter_metric_area.get_parent()) {
239 level_meter->pack_end (meter_metric_area, false, false);
240 meter_metric_area.show_all ();
242 GainMeterBase::setup_meters (len);
245 bool
246 GainMeterBase::gain_key_press (GdkEventKey* ev)
248 if (key_is_legal_for_numeric_entry (ev->keyval)) {
249 /* drop through to normal handling */
250 return false;
252 /* illegal key for gain entry */
253 return true;
256 bool
257 GainMeterBase::peak_button_release (GdkEventButton* ev)
259 /* reset peak label */
261 if (ev->button == 1 && Keyboard::modifier_state_equals (ev->state, Keyboard::PrimaryModifier|Keyboard::TertiaryModifier)) {
262 ResetAllPeakDisplays ();
263 } else if (ev->button == 1 && Keyboard::modifier_state_equals (ev->state, Keyboard::PrimaryModifier)) {
264 boost::shared_ptr<Route> r;
266 if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
267 ResetGroupPeakDisplays (r->mix_group());
269 } else {
270 reset_peak_display ();
273 return true;
276 void
277 GainMeterBase::reset_peak_display ()
279 boost::shared_ptr<Route> r;
281 if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
282 r->reset_max_peak_meters();
285 level_meter->clear_meters();
286 max_peak = -INFINITY;
287 peak_display.set_label (_("-Inf"));
288 peak_display.set_name ("MixerStripPeakDisplay");
291 void
292 GainMeterBase::reset_group_peak_display (RouteGroup* group)
294 boost::shared_ptr<Route> r;
296 if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
297 if (group == r->mix_group()) {
298 reset_peak_display ();
303 void
304 GainMeterBase::popup_meter_menu (GdkEventButton *ev)
306 using namespace Menu_Helpers;
308 if (meter_menu == 0) {
309 meter_menu = new Gtk::Menu;
310 MenuList& items = meter_menu->items();
312 items.push_back (MenuElem ("-inf .. +0dBFS"));
313 items.push_back (MenuElem ("-10dB .. +0dBFS"));
314 items.push_back (MenuElem ("-4 .. +0dBFS"));
315 items.push_back (SeparatorElem());
316 items.push_back (MenuElem ("-inf .. -2dBFS"));
317 items.push_back (MenuElem ("-10dB .. -2dBFS"));
318 items.push_back (MenuElem ("-4 .. -2dBFS"));
321 meter_menu->popup (1, ev->time);
324 bool
325 GainMeterBase::gain_focused (GdkEventFocus* ev)
327 if (ev->in) {
328 gain_display.select_region (0, -1);
329 } else {
330 gain_display.select_region (0, 0);
332 return false;
335 void
336 GainMeterBase::gain_activated ()
338 float f;
340 if (sscanf (gain_display.get_text().c_str(), "%f", &f) == 1) {
342 /* clamp to displayable values */
344 f = min (f, 6.0f);
346 _io->set_gain (dB_to_coefficient(f), this);
348 if (gain_display.has_focus()) {
349 PublicEditor::instance().reset_focus();
354 void
355 GainMeterBase::show_gain ()
357 char buf[32];
359 float v = gain_adjustment.get_value();
361 if (v == 0.0) {
362 strcpy (buf, _("-inf"));
363 } else {
364 snprintf (buf, 32, "%.1f", accurate_coefficient_to_dB (slider_position_to_gain (v)));
367 gain_display.set_text (buf);
370 void
371 GainMeterBase::gain_adjusted ()
373 if (!ignore_toggle) {
374 _io->set_gain (slider_position_to_gain (gain_adjustment.get_value()), this);
376 show_gain ();
379 void
380 GainMeterBase::effective_gain_display ()
382 gfloat value = gain_to_slider_position (_io->effective_gain());
384 if (gain_adjustment.get_value() != value) {
385 ignore_toggle = true;
386 gain_adjustment.set_value (value);
387 ignore_toggle = false;
391 void
392 GainMeterBase::gain_changed (void *src)
394 Gtkmm2ext::UI::instance()->call_slot (mem_fun(*this, &GainMeterBase::effective_gain_display));
397 void
398 GainMeterBase::set_meter_strip_name (const char * name)
400 meter_metric_area.set_name (name);
401 style_changed = true;
404 void
405 GainMeterBase::set_fader_name (const char * name)
407 gain_slider->set_name (name);
410 void
411 GainMeterBase::update_gain_sensitive ()
413 static_cast<Gtkmm2ext::SliderController*>(gain_slider)->set_sensitive (!(_io->gain_automation_state() & Play));
417 static MeterPoint
418 next_meter_point (MeterPoint mp)
420 switch (mp) {
421 case MeterInput:
422 return MeterPreFader;
423 break;
425 case MeterPreFader:
426 return MeterPostFader;
427 break;
429 case MeterPostFader:
430 return MeterInput;
431 break;
433 /*NOTREACHED*/
434 return MeterInput;
437 gint
438 GainMeterBase::meter_press(GdkEventButton* ev)
440 boost::shared_ptr<Route> _route;
442 wait_for_release = false;
444 if ((_route = boost::dynamic_pointer_cast<Route>(_io)) == 0) {
445 return FALSE;
448 if (!ignore_toggle) {
450 if (Keyboard::is_context_menu_event (ev)) {
452 // no menu at this time.
454 } else {
456 if (Keyboard::is_button2_event(ev)) {
458 // Primary-button2 click is the midi binding click
459 // button2-click is "momentary"
461 if (!Keyboard::modifier_state_equals (ev->state, Keyboard::ModifierMask (Keyboard::PrimaryModifier))) {
462 wait_for_release = true;
463 old_meter_point = _route->meter_point ();
467 if (ev->button == 1 || Keyboard::is_button2_event (ev)) {
469 if (Keyboard::modifier_state_equals (ev->state, Keyboard::ModifierMask (Keyboard::PrimaryModifier|Keyboard::TertiaryModifier))) {
471 /* Primary+Tertiary-click applies change to all routes */
473 _session.begin_reversible_command (_("meter point change"));
474 Session::GlobalMeteringStateCommand *cmd = new Session::GlobalMeteringStateCommand (_session, this);
475 _session.foreach_route (this, &GainMeterBase::set_meter_point, next_meter_point (_route->meter_point()));
476 cmd->mark();
477 _session.add_command (cmd);
478 _session.commit_reversible_command ();
481 } else if (Keyboard::modifier_state_equals (ev->state, Keyboard::PrimaryModifier)) {
483 /* Primary-click: solo mix group.
484 NOTE: Primary-button2 is MIDI learn.
487 if (ev->button == 1) {
488 _session.begin_reversible_command (_("meter point change"));
489 Session::GlobalMeteringStateCommand *cmd = new Session::GlobalMeteringStateCommand (_session, this);
490 set_mix_group_meter_point (*_route, next_meter_point (_route->meter_point()));
491 cmd->mark();
492 _session.add_command (cmd);
493 _session.commit_reversible_command ();
496 } else {
498 /* click: change just this route */
500 // XXX no undo yet
502 _route->set_meter_point (next_meter_point (_route->meter_point()), this);
508 return true;
512 gint
513 GainMeterBase::meter_release(GdkEventButton* ev)
515 if(!ignore_toggle){
516 if (wait_for_release){
517 wait_for_release = false;
519 boost::shared_ptr<Route> r;
521 if ((r = boost::dynamic_pointer_cast<Route>(_io)) != 0) {
522 set_meter_point (*r, old_meter_point);
527 return true;
530 void
531 GainMeterBase::set_meter_point (Route& route, MeterPoint mp)
533 route.set_meter_point (mp, this);
536 void
537 GainMeterBase::set_mix_group_meter_point (Route& route, MeterPoint mp)
539 RouteGroup* mix_group;
541 if((mix_group = route.mix_group()) != 0){
542 mix_group->apply (&Route::set_meter_point, mp, this);
543 } else {
544 route.set_meter_point (mp, this);
548 void
549 GainMeterBase::meter_point_clicked ()
551 boost::shared_ptr<Route> r;
553 if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
554 /* WHAT? */
558 gint
559 GainMeterBase::start_gain_touch (GdkEventButton* ev)
561 _io->start_gain_touch ();
562 return FALSE;
565 gint
566 GainMeterBase::end_gain_touch (GdkEventButton* ev)
568 _io->end_gain_touch ();
569 return FALSE;
572 gint
573 GainMeterBase::gain_automation_state_button_event (GdkEventButton *ev)
575 if (ev->type == GDK_BUTTON_RELEASE) {
576 return TRUE;
579 switch (ev->button) {
580 case 1:
581 gain_astate_menu.popup (1, ev->time);
582 break;
583 default:
584 break;
587 return TRUE;
590 gint
591 GainMeterBase::gain_automation_style_button_event (GdkEventButton *ev)
593 if (ev->type == GDK_BUTTON_RELEASE) {
594 return TRUE;
597 switch (ev->button) {
598 case 1:
599 gain_astyle_menu.popup (1, ev->time);
600 break;
601 default:
602 break;
604 return TRUE;
607 string
608 GainMeterBase::astate_string (AutoState state)
610 return _astate_string (state, false);
613 string
614 GainMeterBase::short_astate_string (AutoState state)
616 return _astate_string (state, true);
619 string
620 GainMeterBase::_astate_string (AutoState state, bool shrt)
622 string sstr;
624 switch (state) {
625 case Off:
626 sstr = (shrt ? "M" : _("M"));
627 break;
628 case Play:
629 sstr = (shrt ? "P" : _("P"));
630 break;
631 case Touch:
632 sstr = (shrt ? "T" : _("T"));
633 break;
634 case Write:
635 sstr = (shrt ? "W" : _("W"));
636 break;
639 return sstr;
642 string
643 GainMeterBase::astyle_string (AutoStyle style)
645 return _astyle_string (style, false);
648 string
649 GainMeterBase::short_astyle_string (AutoStyle style)
651 return _astyle_string (style, true);
654 string
655 GainMeterBase::_astyle_string (AutoStyle style, bool shrt)
657 if (style & Trim) {
658 return _("Trim");
659 } else {
660 /* XXX it might different in different languages */
662 return (shrt ? _("Abs") : _("Abs"));
666 void
667 GainMeterBase::gain_automation_style_changed ()
669 switch (_width) {
670 case Wide:
671 gain_automation_style_button.set_label (astyle_string(_io->gain_automation_curve().automation_style()));
672 break;
673 case Narrow:
674 gain_automation_style_button.set_label (short_astyle_string(_io->gain_automation_curve().automation_style()));
675 break;
679 void
680 GainMeterBase::gain_automation_state_changed ()
682 ENSURE_GUI_THREAD(mem_fun(*this, &GainMeterBase::gain_automation_state_changed));
684 bool x;
686 switch (_width) {
687 case Wide:
688 gain_automation_state_button.set_label (astate_string(_io->gain_automation_curve().automation_state()));
689 break;
690 case Narrow:
691 gain_automation_state_button.set_label (short_astate_string(_io->gain_automation_curve().automation_state()));
692 break;
695 x = (_io->gain_automation_state() != Off);
697 if (gain_automation_state_button.get_active() != x) {
698 ignore_toggle = true;
699 gain_automation_state_button.set_active (x);
700 ignore_toggle = false;
703 update_gain_sensitive ();
705 /* start watching automation so that things move */
707 gain_watching.disconnect();
709 if (x) {
710 gain_watching = ARDOUR_UI::RapidScreenUpdate.connect (mem_fun (*this, &GainMeterBase::effective_gain_display));
714 void
715 GainMeterBase::update_meters()
717 char buf[32];
718 float mpeak = level_meter->update_meters();
720 if (mpeak > max_peak) {
721 max_peak = mpeak;
722 if (mpeak <= -200.0f) {
723 peak_display.set_label (_("-inf"));
724 } else {
725 snprintf (buf, sizeof(buf), "%.1f", mpeak);
726 peak_display.set_label (buf);
729 if (mpeak >= 0.0f) {
730 peak_display.set_name ("MixerStripPeakDisplayPeak");
735 void GainMeterBase::color_handler(bool dpi)
737 color_changed = true;
738 dpi_changed = (dpi) ? true : false;
739 setup_meters();
742 void
743 GainMeterBase::set_width (Width w, int len)
745 _width = w;
746 level_meter->setup_meters (len);
750 void
751 GainMeterBase::on_theme_changed()
753 style_changed = true;
756 GainMeter::GainMeter (Session& s)
757 : GainMeterBase (s, slider, false)
759 gain_display_box.set_homogeneous (true);
760 gain_display_box.set_spacing (2);
761 gain_display_box.pack_start (gain_display, true, true);
763 meter_metric_area.set_name ("AudioTrackMetrics");
764 set_size_request_to_display_given_text (meter_metric_area, "-50", 0, 0);
766 gain_automation_style_button.set_name ("MixerAutomationModeButton");
767 gain_automation_state_button.set_name ("MixerAutomationPlaybackButton");
769 ARDOUR_UI::instance()->tooltips().set_tip (gain_automation_state_button, _("Fader automation mode"));
770 ARDOUR_UI::instance()->tooltips().set_tip (gain_automation_style_button, _("Fader automation type"));
772 gain_automation_style_button.unset_flags (Gtk::CAN_FOCUS);
773 gain_automation_state_button.unset_flags (Gtk::CAN_FOCUS);
775 gain_automation_state_button.set_size_request(15, 15);
776 gain_automation_style_button.set_size_request(15, 15);
778 HBox* fader_centering_box = manage (new HBox);
779 fader_centering_box->pack_start (*gain_slider, true, false);
781 fader_vbox = manage (new Gtk::VBox());
782 fader_vbox->set_spacing (0);
783 fader_vbox->pack_start (*fader_centering_box, false, false, 0);
785 hbox.set_spacing (2);
786 hbox.pack_start (*fader_vbox, true, true);
788 set_spacing (2);
790 pack_start (gain_display_box, Gtk::PACK_SHRINK);
791 pack_start (hbox, Gtk::PACK_SHRINK);
793 meter_metric_area.signal_expose_event().connect (mem_fun(*this, &GainMeter::meter_metrics_expose));
796 void
797 GainMeter::set_io (boost::shared_ptr<IO> io)
799 if (level_meter->get_parent()) {
800 hbox.remove (*level_meter);
803 if (peak_display.get_parent()) {
804 gain_display_box.remove (peak_display);
807 if (gain_automation_state_button.get_parent()) {
808 fader_vbox->remove (gain_automation_state_button);
811 GainMeterBase::set_io (io);
813 boost::shared_ptr<Route> r;
815 if ((r = boost::dynamic_pointer_cast<Route> (_io)) != 0) {
818 if we have a non-hidden route (ie. we're not the click or the auditioner),
819 pack some route-dependent stuff.
822 gain_display_box.pack_end (peak_display, true, true);
823 hbox.pack_end (*level_meter, true, true);
825 if (!r->hidden()) {
826 fader_vbox->pack_start (gain_automation_state_button, false, false, 0);
832 GainMeter::get_gm_width ()
834 Gtk::Requisition sz;
835 hbox.size_request (sz);
836 return sz.width;
839 Glib::RefPtr<Gdk::Pixmap>
840 GainMeter::render_metrics (Gtk::Widget& w)
842 Glib::RefPtr<Gdk::Window> win (w.get_window());
843 Glib::RefPtr<Gdk::GC> fg_gc (w.get_style()->get_fg_gc (Gtk::STATE_NORMAL));
844 Glib::RefPtr<Gdk::GC> bg_gc (w.get_style()->get_bg_gc (Gtk::STATE_NORMAL));
845 gint width, height;
846 int db_points[] = { -50, -40, -20, -30, -10, -3, 0, 4 };
847 char buf[32];
849 win->get_size (width, height);
851 Glib::RefPtr<Gdk::Pixmap> pixmap = Gdk::Pixmap::create (win, width, height);
853 metric_pixmaps[w.get_name()] = pixmap;
855 pixmap->draw_rectangle (bg_gc, true, 0, 0, width, height);
857 Glib::RefPtr<Pango::Layout> layout = w.create_pango_layout("");
859 for (uint32_t i = 0; i < sizeof (db_points)/sizeof (db_points[0]); ++i) {
861 float fraction = log_meter (db_points[i]);
862 gint pos = height - (gint) floor (height * fraction);
864 snprintf (buf, sizeof (buf), "%d", abs (db_points[i]));
866 layout->set_text (buf);
868 /* we want logical extents, not ink extents here */
870 int width, height;
871 layout->get_pixel_size (width, height);
873 pixmap->draw_line (fg_gc, 0, pos, 4, pos);
874 pixmap->draw_layout (fg_gc, 6, pos - (height/2), layout);
877 return pixmap;
880 gint
881 GainMeter::meter_metrics_expose (GdkEventExpose *ev)
883 static Glib::RefPtr<Gtk::Style> meter_style;
884 if (style_changed) {
885 meter_style = meter_metric_area.get_style();
887 Glib::RefPtr<Gdk::Window> win (meter_metric_area.get_window());
888 Glib::RefPtr<Gdk::GC> bg_gc (meter_style->get_bg_gc (Gtk::STATE_INSENSITIVE));
889 GdkRectangle base_rect;
890 GdkRectangle draw_rect;
891 gint width, height;
893 win->get_size (width, height);
895 base_rect.width = width;
896 base_rect.height = height;
897 base_rect.x = 0;
898 base_rect.y = 0;
900 Glib::RefPtr<Gdk::Pixmap> pixmap;
901 std::map<string,Glib::RefPtr<Gdk::Pixmap> >::iterator i = metric_pixmaps.find (meter_metric_area.get_name());
903 if (i == metric_pixmaps.end() || style_changed || dpi_changed) {
904 pixmap = render_metrics (meter_metric_area);
905 } else {
906 pixmap = i->second;
909 gdk_rectangle_intersect (&ev->area, &base_rect, &draw_rect);
910 win->draw_drawable (bg_gc, pixmap, draw_rect.x, draw_rect.y, draw_rect.x, draw_rect.y, draw_rect.width, draw_rect.height);
911 style_changed = false;
912 return true;