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audio_region_view.cc

/*
    Copyright (C) 2001-2006 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 <cmath>
#include <cassert>
#include <algorithm>

#include <gtkmm.h>

#include <gtkmm2ext/gtk_ui.h>

#include <ardour/playlist.h>
#include <ardour/audioregion.h>
#include <ardour/audiosource.h>
#include <ardour/audio_diskstream.h>
#include <pbd/memento_command.h>
#include <pbd/stacktrace.h>

#include "streamview.h"
#include "audio_region_view.h"
#include "audio_time_axis.h"
#include "simplerect.h"
#include "simpleline.h"
#include "waveview.h"
#include "public_editor.h"
#include "audio_region_editor.h"
#include "region_gain_line.h"
#include "ghostregion.h"
#include "audio_time_axis.h"
#include "utils.h"
#include "rgb_macros.h"
#include "gui_thread.h"
#include "ardour_ui.h"

#include "i18n.h"

#define MUTED_ALPHA 0x50

using namespace sigc;
using namespace ARDOUR;
using namespace PBD;
using namespace Editing;
using namespace ArdourCanvas;

static const int32_t sync_mark_width = 9;

AudioRegionView::AudioRegionView (ArdourCanvas::Group *parent, RouteTimeAxisView &tv, boost::shared_ptr<AudioRegion> r, double spu,
                          Gdk::Color& basic_color)
      : RegionView (parent, tv, r, spu, basic_color)
      , sync_mark(0)
      , zero_line(0)
      , fade_in_shape(0)
      , fade_out_shape(0)
      , fade_in_handle(0)
      , fade_out_handle(0)
      , gain_line(0)
      , _amplitude_above_axis(1.0)
      , _flags(0)
      , fade_color(0)
{
}

AudioRegionView::AudioRegionView (ArdourCanvas::Group *parent, RouteTimeAxisView &tv, boost::shared_ptr<AudioRegion> r, double spu, 
                          Gdk::Color& basic_color, TimeAxisViewItem::Visibility visibility)
      : RegionView (parent, tv, r, spu, basic_color, visibility)
      , sync_mark(0)
      , zero_line(0)
      , fade_in_shape(0)
      , fade_out_shape(0)
      , fade_in_handle(0)
      , fade_out_handle(0)
      , gain_line(0)
      , _amplitude_above_axis(1.0)
      , _flags(0)
      , fade_color(0)
{
}


AudioRegionView::AudioRegionView (const AudioRegionView& other)
      : RegionView (other)
      , zero_line(0)
      , fade_in_shape(0)
      , fade_out_shape(0)
      , fade_in_handle(0)
      , fade_out_handle(0)
      , gain_line(0)
      , _amplitude_above_axis(1.0)
      , _flags(0)
      , fade_color(0)

{
      Gdk::Color c;
      int r,g,b,a;

      UINT_TO_RGBA (other.fill_color, &r, &g, &b, &a);
      c.set_rgb_p (r/255.0, g/255.0, b/255.0);
      
      init (c, false);
}

void
AudioRegionView::init (Gdk::Color& basic_color, bool wfd)
{
      // FIXME: Some redundancy here with RegionView::init.  Need to figure out
      // where order is important and where it isn't...
      
      RegionView::init(basic_color, false);
      
      XMLNode *node;

      _amplitude_above_axis = 1.0;
      zero_line             = 0;
      _flags                = 0;

      if ((node = _region->extra_xml ("GUI")) != 0) {
            set_flags (node);
      } else {
            _flags = WaveformVisible;
            store_flags ();
      }

      if (trackview.editor.new_regionviews_display_gain()) {
            _flags |= EnvelopeVisible;
      }

      compute_colors (basic_color);

      create_waves ();

      fade_in_shape = new ArdourCanvas::Polygon (*group);
      fade_in_shape->property_fill_color_rgba() = fade_color;
      fade_in_shape->set_data ("regionview", this);
      
      fade_out_shape = new ArdourCanvas::Polygon (*group);
      fade_out_shape->property_fill_color_rgba() = fade_color;
      fade_out_shape->set_data ("regionview", this);


      {
            uint32_t r,g,b,a;
            UINT_TO_RGBA(fill_color,&r,&g,&b,&a);
      

            fade_in_handle = new ArdourCanvas::SimpleRect (*group);
            fade_in_handle->property_fill_color_rgba() = RGBA_TO_UINT(r,g,b,0);
            fade_in_handle->property_outline_pixels() = 0;
            fade_in_handle->property_y1() = 2.0;
            fade_in_handle->property_y2() = 7.0;
            
            fade_in_handle->set_data ("regionview", this);
            
            fade_out_handle = new ArdourCanvas::SimpleRect (*group);
            fade_out_handle->property_fill_color_rgba() = RGBA_TO_UINT(r,g,b,0);
            fade_out_handle->property_outline_pixels() = 0;
            fade_out_handle->property_y1() = 2.0;
            fade_out_handle->property_y2() = 7.0;
            
            fade_out_handle->set_data ("regionview", this);
      }

      string foo = _region->name();
      foo += ':';
      foo += "gain";

      gain_line = new AudioRegionGainLine (foo, trackview.session(), *this, *group, audio_region()->envelope());

      if (!(_flags & EnvelopeVisible)) {
            gain_line->hide ();
      } else {
            gain_line->show ();
      }

      gain_line->reset ();

      set_height (trackview.height);

      region_muted ();
      region_sync_changed ();
      region_resized (BoundsChanged);
      set_waveview_data_src();
      region_locked ();
      envelope_active_changed ();
      fade_in_active_changed ();
      fade_out_active_changed ();

      _region->StateChanged.connect (mem_fun(*this, &AudioRegionView::region_changed));

      fade_in_shape->signal_event().connect (bind (mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_in_event), fade_in_shape, this));
      fade_in_handle->signal_event().connect (bind (mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_in_handle_event), fade_in_handle, this));
      fade_out_shape->signal_event().connect (bind (mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_out_event), fade_out_shape, this));
      fade_out_handle->signal_event().connect (bind (mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_out_handle_event), fade_out_handle, this));

      set_colors ();

      /* XXX sync mark drag? */
}

AudioRegionView::~AudioRegionView ()
{
      in_destructor = true;

      RegionViewGoingAway (this); /* EMIT_SIGNAL */

      for (vector<GnomeCanvasWaveViewCache *>::iterator cache = wave_caches.begin(); cache != wave_caches.end() ; ++cache) {
            gnome_canvas_waveview_cache_destroy (*cache);
      }

      /* all waveviews etc will be destroyed when the group is destroyed */

      if (gain_line) {
            delete gain_line;
      }
}

boost::shared_ptr<ARDOUR::AudioRegion>
AudioRegionView::audio_region() const
{
      // "Guaranteed" to succeed...
      return boost::dynamic_pointer_cast<AudioRegion>(_region);
}

void
AudioRegionView::region_changed (Change what_changed)
{
      ENSURE_GUI_THREAD (bind (mem_fun(*this, &AudioRegionView::region_changed), what_changed));

      RegionView::region_changed(what_changed);

      if (what_changed & AudioRegion::ScaleAmplitudeChanged) {
            region_scale_amplitude_changed ();
      }
      if (what_changed & AudioRegion::FadeInChanged) {
            fade_in_changed ();
      }
      if (what_changed & AudioRegion::FadeOutChanged) {
            fade_out_changed ();
      }
      if (what_changed & AudioRegion::FadeInActiveChanged) {
            fade_in_active_changed ();
      }
      if (what_changed & AudioRegion::FadeOutActiveChanged) {
            fade_out_active_changed ();
      }
      if (what_changed & AudioRegion::EnvelopeActiveChanged) {
            envelope_active_changed ();
      }
}

void
AudioRegionView::fade_in_changed ()
{
      reset_fade_in_shape ();
}

void
AudioRegionView::fade_out_changed ()
{
      reset_fade_out_shape ();
}
void
AudioRegionView::fade_in_active_changed ()
{
      uint32_t r,g,b,a;
      uint32_t col;
      UINT_TO_RGBA(fade_color,&r,&g,&b,&a);

      if (audio_region()->fade_in_active()) {
            col = RGBA_TO_UINT(r,g,b,120);
            fade_in_shape->property_fill_color_rgba() = col;
            fade_in_shape->property_width_pixels() = 0;
            fade_in_shape->property_outline_color_rgba() = RGBA_TO_UINT(r,g,b,0);
      } else { 
            col = RGBA_TO_UINT(r,g,b,0);
            fade_in_shape->property_fill_color_rgba() = col;
            fade_in_shape->property_width_pixels() = 1;
            fade_in_shape->property_outline_color_rgba() = RGBA_TO_UINT(r,g,b,255);
      }
}

void
AudioRegionView::fade_out_active_changed ()
{
      uint32_t r,g,b,a;
      uint32_t col;
      UINT_TO_RGBA(fade_color,&r,&g,&b,&a);

      if (audio_region()->fade_out_active()) {
            col = RGBA_TO_UINT(r,g,b,120);
            fade_out_shape->property_fill_color_rgba() = col;
            fade_out_shape->property_width_pixels() = 0;
            fade_out_shape->property_outline_color_rgba() = RGBA_TO_UINT(r,g,b,0);
      } else { 
            col = RGBA_TO_UINT(r,g,b,0);
            fade_out_shape->property_fill_color_rgba() = col;
            fade_out_shape->property_width_pixels() = 1;
            fade_out_shape->property_outline_color_rgba() = RGBA_TO_UINT(r,g,b,255);
      }
}


void
AudioRegionView::region_scale_amplitude_changed ()
{
      ENSURE_GUI_THREAD (mem_fun(*this, &AudioRegionView::region_scale_amplitude_changed));

      for (uint32_t n = 0; n < waves.size(); ++n) {
            // force a reload of the cache
            waves[n]->property_data_src() = _region.get();
      }
}

void
AudioRegionView::region_resized (Change what_changed)
{
      RegionView::region_resized(what_changed);

      if (what_changed & Change (StartChanged|LengthChanged)) {

            for (uint32_t n = 0; n < waves.size(); ++n) {
                  waves[n]->property_region_start() = _region->start();
            }
            
            for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {

                  for (vector<WaveView*>::iterator w = (*i)->waves.begin(); w != (*i)->waves.end(); ++w) {
                        (*w)->property_region_start() = _region->start();
                  }
            }
      }
}

void
AudioRegionView::reset_width_dependent_items (double pixel_width)
{
      RegionView::reset_width_dependent_items(pixel_width);
      assert(_pixel_width == pixel_width);

      if (zero_line) {
            zero_line->property_x2() = pixel_width - 1.0;
      }

      if (fade_in_handle) {
            if (pixel_width <= 6.0) {
                  fade_in_handle->hide();
                  fade_out_handle->hide();
            } else {
                  if (_height < 5.0) {
                        fade_in_handle->hide();
                        fade_out_handle->hide();
                  } else {
                        fade_in_handle->show();
                        fade_out_handle->show();
                  }
            }
      }

      reset_fade_shapes ();
}

void
AudioRegionView::region_muted ()
{
      RegionView::region_muted();

      for (uint32_t n=0; n < waves.size(); ++n) {
            if (_region->muted()) {
                  waves[n]->property_wave_color() = UINT_RGBA_CHANGE_A(ARDOUR_UI::config()->canvasvar_WaveForm.get(), MUTED_ALPHA);
            } else {
                  waves[n]->property_wave_color() = ARDOUR_UI::config()->canvasvar_WaveForm.get();
            }
      }
}


void
AudioRegionView::set_height (gdouble height)
{
      uint32_t wcnt = waves.size();

      // FIXME: ick
      TimeAxisViewItem::set_height (height - 2);
      
      _height = height;

      for (uint32_t n=0; n < wcnt; ++n) {
            gdouble ht;

            if ((height) <= NAME_HIGHLIGHT_THRESH) {
                  ht = ((height-2*wcnt) / (double) wcnt);
            } else {
                  ht = (((height-2*wcnt) - NAME_HIGHLIGHT_SIZE) / (double) wcnt);
            }
            
            gdouble yoff = n * (ht+1);
            
            waves[n]->property_height() = ht;
            waves[n]->property_y() = yoff + 2;
      }

      if (gain_line) {
            if ((height/wcnt) < NAME_HIGHLIGHT_SIZE) {
                  gain_line->hide ();
            } else {
                  if (_flags & EnvelopeVisible) {
                        gain_line->show ();
                  }
            }
            gain_line->set_height ((uint32_t) rint (height - NAME_HIGHLIGHT_SIZE));
      }

      manage_zero_line ();
      reset_fade_shapes ();
      
      if (name_text) {
            name_text->raise_to_top();
      }
}

void
AudioRegionView::manage_zero_line ()
{
      if (!zero_line) {
            return;
      }

      if (_height >= 100) {
            gdouble wave_midpoint = (_height - NAME_HIGHLIGHT_SIZE) / 2.0;
            zero_line->property_y1() = wave_midpoint;
            zero_line->property_y2() = wave_midpoint;
            zero_line->show();
      } else {
            zero_line->hide();
      }
}

void
AudioRegionView::reset_fade_shapes ()
{
      reset_fade_in_shape ();
      reset_fade_out_shape ();
}

void
AudioRegionView::reset_fade_in_shape ()
{
      reset_fade_in_shape_width ((nframes_t) audio_region()->fade_in().back()->when);
}
      
void
AudioRegionView::reset_fade_in_shape_width (nframes_t width)
{
      if (fade_in_handle == 0) {
            return;
      }

      /* smallest size for a fade is 64 frames */

      width = std::max ((nframes_t) 64, width);

      Points* points;
      double pwidth = width / samples_per_unit;
      uint32_t npoints = std::min (gdk_screen_width(), (int) pwidth);
      double h; 
      
      if (_height < 5) {
            fade_in_shape->hide();
            fade_in_handle->hide();
            return;
      }

      double handle_center;
      handle_center = pwidth;
      
      if (handle_center > 7.0) {
            handle_center -= 3.0;
      } else {
            handle_center = 3.0;
      }
      
      fade_in_handle->property_x1() =  handle_center - 3.0;
      fade_in_handle->property_x2() =  handle_center + 3.0;
      
      if (pwidth < 5) {
            fade_in_shape->hide();
            return;
      }

      fade_in_shape->show();

      float curve[npoints];
      audio_region()->fade_in().get_vector (0, audio_region()->fade_in().back()->when, curve, npoints);

      points = get_canvas_points ("fade in shape", npoints+3);

      if (_height > NAME_HIGHLIGHT_THRESH) {
            h = _height - NAME_HIGHLIGHT_SIZE;
      } else {
            h = _height;
      }

      /* points *MUST* be in anti-clockwise order */

      uint32_t pi, pc;
      double xdelta = pwidth/npoints;

      for (pi = 0, pc = 0; pc < npoints; ++pc) {
            (*points)[pi].set_x(1 + (pc * xdelta));
            (*points)[pi++].set_y(2 + (h - (curve[pc] * h)));
      }
      
      /* fold back */

      (*points)[pi].set_x(pwidth);
      (*points)[pi++].set_y(2);

      (*points)[pi].set_x(1);
      (*points)[pi++].set_y(2);

      /* connect the dots ... */

      (*points)[pi] = (*points)[0];
      
      fade_in_shape->property_points() = *points;
      delete points;
}

void
AudioRegionView::reset_fade_out_shape ()
{
      reset_fade_out_shape_width ((nframes_t) audio_region()->fade_out().back()->when);
}

void
AudioRegionView::reset_fade_out_shape_width (nframes_t width)
{     
      if (fade_out_handle == 0) {
            return;
      }

      /* smallest size for a fade is 64 frames */

      width = std::max ((nframes_t) 64, width);

      Points* points;
      double pwidth = width / samples_per_unit;
      uint32_t npoints = std::min (gdk_screen_width(), (int) pwidth);
      double h;

      if (_height < 5) {
            fade_out_shape->hide();
            fade_out_handle->hide();
            return;
      }

      double handle_center;
      handle_center = (_region->length() - width) / samples_per_unit;
      
      if (handle_center > 7.0) {
            handle_center -= 3.0;
      } else {
            handle_center = 3.0;
      }
      
      fade_out_handle->property_x1() =  handle_center - 3.0;
      fade_out_handle->property_x2() =  handle_center + 3.0;

      /* don't show shape if its too small */
      
      if (pwidth < 5) {
            fade_out_shape->hide();
            return;
      } 
      
      fade_out_shape->show();

      float curve[npoints];
      audio_region()->fade_out().get_vector (0, audio_region()->fade_out().back()->when, curve, npoints);

      if (_height > NAME_HIGHLIGHT_THRESH) {
            h = _height - NAME_HIGHLIGHT_SIZE;
      } else {
            h = _height;
      }

      /* points *MUST* be in anti-clockwise order */

      points = get_canvas_points ("fade out shape", npoints+3);

      uint32_t pi, pc;
      double xdelta = pwidth/npoints;

      for (pi = 0, pc = 0; pc < npoints; ++pc) {
            (*points)[pi].set_x(_pixel_width - 1 - pwidth + (pc*xdelta));
            (*points)[pi++].set_y(2 + (h - (curve[pc] * h)));
      }
      
      /* fold back */

      (*points)[pi].set_x(_pixel_width);
      (*points)[pi++].set_y(h);

      (*points)[pi].set_x(_pixel_width);
      (*points)[pi++].set_y(2);

      /* connect the dots ... */

      (*points)[pi] = (*points)[0];

      fade_out_shape->property_points() = *points;
      delete points;
}

void
AudioRegionView::set_samples_per_unit (gdouble spu)
{
      RegionView::set_samples_per_unit (spu);

      if (_flags & WaveformVisible) {
            for (uint32_t n=0; n < waves.size(); ++n) {
                  waves[n]->property_samples_per_unit() = spu;
            }
      }

      if (gain_line) {
            gain_line->reset ();
      }

      reset_fade_shapes ();
}

void
AudioRegionView::set_amplitude_above_axis (gdouble spp)
{
      for (uint32_t n=0; n < waves.size(); ++n) {
            waves[n]->property_amplitude_above_axis() = spp;
      }
}

void
AudioRegionView::compute_colors (Gdk::Color& basic_color)
{
      RegionView::compute_colors(basic_color);
      
      uint32_t r, g, b, a;

      /* gain color computed in envelope_active_changed() */

      UINT_TO_RGBA (fill_color, &r, &g, &b, &a);
      fade_color = RGBA_TO_UINT(r,g,b,120);
}

void
AudioRegionView::set_colors ()
{
      RegionView::set_colors();
      
      if (gain_line) {
            gain_line->set_line_color (audio_region()->envelope_active() ? ARDOUR_UI::config()->canvasvar_GainLine.get() : ARDOUR_UI::config()->canvasvar_GainLineInactive.get());
      }

      for (uint32_t n=0; n < waves.size(); ++n) {
            if (_region->muted()) {
                  waves[n]->property_wave_color() = UINT_RGBA_CHANGE_A(ARDOUR_UI::config()->canvasvar_WaveForm.get(), MUTED_ALPHA);
            } else {
                  waves[n]->property_wave_color() = ARDOUR_UI::config()->canvasvar_WaveForm.get();
            }

            waves[n]->property_clip_color() = ARDOUR_UI::config()->canvasvar_WaveFormClip.get();
            waves[n]->property_zero_color() = ARDOUR_UI::config()->canvasvar_ZeroLine.get();
      }
}

void
AudioRegionView::show_region_editor ()
{
      if (editor == 0) {
            editor = new AudioRegionEditor (trackview.session(), audio_region(), *this);
            // GTK2FIX : how to ensure float without realizing
            // editor->realize ();
            // trackview.editor.ensure_float (*editor);
      } 

      editor->present ();
      editor->show_all();
}

void
AudioRegionView::set_waveform_visible (bool yn)
{
      if (((_flags & WaveformVisible) != yn)) {
            if (yn) {
                  for (uint32_t n=0; n < waves.size(); ++n) {
                        /* make sure the zoom level is correct, since we don't update
                           this when waveforms are hidden.
                        */
                        waves[n]->property_samples_per_unit() = samples_per_unit;
                        waves[n]->show();
                  }
                  _flags |= WaveformVisible;
            } else {
                  for (uint32_t n=0; n < waves.size(); ++n) {
                        waves[n]->hide();
                  }
                  _flags &= ~WaveformVisible;
            }
            store_flags ();
      }
}

void
AudioRegionView::temporarily_hide_envelope ()
{
      if (gain_line) {
            gain_line->hide ();
      }
}

void
AudioRegionView::unhide_envelope ()
{
      if (gain_line && (_flags & EnvelopeVisible)) {
            gain_line->show ();
      }
}

void
AudioRegionView::set_envelope_visible (bool yn)
{
      if (gain_line && ((_flags & EnvelopeVisible) != yn)) {
            if (yn) {
                  gain_line->show ();
                  _flags |= EnvelopeVisible;
            } else {
                  gain_line->hide ();
                  _flags &= ~EnvelopeVisible;
            }
            store_flags ();
      }
}

void
AudioRegionView::create_waves ()
{
      RouteTimeAxisView& atv (*(dynamic_cast<RouteTimeAxisView*>(&trackview))); // ick

      if (!atv.get_diskstream()) {
            return;
      }

      uint32_t nchans = atv.get_diskstream()->n_channels();
      
      /* in tmp_waves, set up null pointers for each channel so the vector is allocated */
      for (uint32_t n = 0; n < nchans; ++n) {
            tmp_waves.push_back (0);
      }

      for (uint32_t n = 0; n < nchans; ++n) {
            
            if (n >= audio_region()->n_channels()) {
                  break;
            }
            
            wave_caches.push_back (WaveView::create_cache ());

            if (wait_for_data) {
                  if (audio_region()->source(n)->peaks_ready (bind (mem_fun(*this, &AudioRegionView::peaks_ready_handler), n), data_ready_connection)) {
                        create_one_wave (n, true);
                  } else {
                  }
            } else {
                  create_one_wave (n, true);
            }
      }
}

void
AudioRegionView::create_one_wave (uint32_t which, bool direct)
{
      RouteTimeAxisView& atv (*(dynamic_cast<RouteTimeAxisView*>(&trackview))); // ick
      uint32_t nchans = atv.get_diskstream()->n_channels();
      uint32_t n;
      uint32_t nwaves = std::min (nchans, audio_region()->n_channels());
      gdouble ht;

      if (trackview.height < NAME_HIGHLIGHT_SIZE) {
            ht = ((trackview.height) / (double) nchans);
      } else {
            ht = ((trackview.height - NAME_HIGHLIGHT_SIZE) / (double) nchans);
      }

      gdouble yoff = which * ht;

      WaveView *wave = new WaveView(*group);

      wave->property_data_src() = (gpointer) _region.get();
      wave->property_cache() =  wave_caches[which];
      wave->property_cache_updater() = true;
      wave->property_channel() =  which;
      wave->property_length_function() = (gpointer) region_length_from_c;
      wave->property_sourcefile_length_function() = (gpointer) sourcefile_length_from_c;
      wave->property_peak_function() =  (gpointer) region_read_peaks_from_c;
      wave->property_x() =  0.0;
      wave->property_y() =  yoff;
      wave->property_height() =  (double) ht;
      wave->property_samples_per_unit() =  samples_per_unit;
      wave->property_amplitude_above_axis() =  _amplitude_above_axis;
      wave->property_wave_color() = _region->muted() ? UINT_RGBA_CHANGE_A(ARDOUR_UI::config()->canvasvar_WaveForm.get(), MUTED_ALPHA) : ARDOUR_UI::config()->canvasvar_WaveForm.get();
      wave->property_clip_color() = ARDOUR_UI::config()->canvasvar_WaveFormClip.get();
      wave->property_zero_color() = ARDOUR_UI::config()->canvasvar_ZeroLine.get();
      wave->property_region_start() = _region->start();
      wave->property_rectified() = (bool) (_flags & WaveformRectified);
      wave->property_logscaled() = (bool) (_flags & WaveformLogScaled);

      if (!(_flags & WaveformVisible)) {
            wave->hide();
      }

      /* note: calling this function is serialized by the lock
         held in the peak building thread that signals that
         peaks are ready for use *or* by the fact that it is
         called one by one from the GUI thread.
      */

      if (which < nchans) {
            tmp_waves[which] = wave;
      } else {
            /* n-channel track, >n-channel source */
      }
      
      /* see if we're all ready */
      
      for (n = 0; n < nchans; ++n) {
            if (tmp_waves[n] == 0) {
                  break;
            }
      }

      if (n == nwaves && waves.empty()) {
            /* all waves are ready */
            tmp_waves.resize(nwaves);

            waves = tmp_waves;
            tmp_waves.clear ();

            /* all waves created, don't hook into peaks ready anymore */
            data_ready_connection.disconnect ();            

            if(0)
            if (!zero_line) {
                  zero_line = new ArdourCanvas::SimpleLine (*group);
                  zero_line->property_x1() = (gdouble) 1.0;
                  zero_line->property_x2() = (gdouble) (_region->length() / samples_per_unit) - 1.0;
                  zero_line->property_color_rgba() = (guint) ARDOUR_UI::config()->canvasvar_ZeroLine.get();
                  manage_zero_line ();
            }
      }
}

void
AudioRegionView::peaks_ready_handler (uint32_t which)
{
      Gtkmm2ext::UI::instance()->call_slot (bind (mem_fun(*this, &AudioRegionView::create_one_wave), which, false));
}

void
AudioRegionView::add_gain_point_event (ArdourCanvas::Item *item, GdkEvent *ev)
{
      if (gain_line == 0) {
            return;
      }

      double x, y;

      /* don't create points that can't be seen */

      set_envelope_visible (true);
      
      x = ev->button.x;
      y = ev->button.y;

      item->w2i (x, y);

      nframes_t fx = trackview.editor.pixel_to_frame (x);

      if (fx > _region->length()) {
            return;
      }

      /* compute vertical fractional position */

      y = 1.0 - (y / (trackview.height - NAME_HIGHLIGHT_SIZE));
      
      /* map using gain line */

      gain_line->view_to_model_y (y);

      trackview.session().begin_reversible_command (_("add gain control point"));
      XMLNode &before = audio_region()->envelope().get_state();

      if (!audio_region()->envelope_active()) {
            XMLNode &region_before = audio_region()->get_state();
            audio_region()->set_envelope_active(true);
            XMLNode &region_after = audio_region()->get_state();
            trackview.session().add_command (new MementoCommand<AudioRegion>(*(audio_region().get()), &region_before, &region_after));
      }

      audio_region()->envelope().add (fx, y);
      
      XMLNode &after = audio_region()->envelope().get_state();
      trackview.session().add_command (new MementoCommand<Curve>(audio_region()->envelope(), &before, &after));
      trackview.session().commit_reversible_command ();
}

void
AudioRegionView::remove_gain_point_event (ArdourCanvas::Item *item, GdkEvent *ev)
{
        ControlPoint *cp = reinterpret_cast<ControlPoint *> (item->get_data ("control_point"));
      audio_region()->envelope().erase (cp->model);
}

void
AudioRegionView::store_flags()
{
      XMLNode *node = new XMLNode ("GUI");

      node->add_property ("waveform-visible", (_flags & WaveformVisible) ? "yes" : "no");
      node->add_property ("envelope-visible", (_flags & EnvelopeVisible) ? "yes" : "no");
      node->add_property ("waveform-rectified", (_flags & WaveformRectified) ? "yes" : "no");
      node->add_property ("waveform-logscaled", (_flags & WaveformLogScaled) ? "yes" : "no");

      _region->add_extra_xml (*node);
}

void
AudioRegionView::set_flags (XMLNode* node)
{
      XMLProperty *prop;

      if ((prop = node->property ("waveform-visible")) != 0) {
            if (prop->value() == "yes") {
                  _flags |= WaveformVisible;
            }
      }

      if ((prop = node->property ("envelope-visible")) != 0) {
            if (prop->value() == "yes") {
                  _flags |= EnvelopeVisible;
            }
      }

      if ((prop = node->property ("waveform-rectified")) != 0) {
            if (prop->value() == "yes") {
                  _flags |= WaveformRectified;
            }
      }

      if ((prop = node->property ("waveform-logscaled")) != 0) {
            if (prop->value() == "yes") {
                  _flags |= WaveformLogScaled;
            }
      }
}
      
void
AudioRegionView::set_waveform_shape (WaveformShape shape)
{
      bool yn;

      /* this slightly odd approach is to leave the door open to 
         other "shapes" such as spectral displays, etc.
      */

      switch (shape) {
      case Rectified:
            yn = true;
            break;

      default:
            yn = false;
            break;
      }

      if (yn != (bool) (_flags & WaveformRectified)) {
            for (vector<WaveView *>::iterator wave = waves.begin(); wave != waves.end() ; ++wave) {
                  (*wave)->property_rectified() = yn;
            }

            if (zero_line) {
                  if (yn) {
                        zero_line->hide();
                  } else {
                        zero_line->show();
                  }
            }

            if (yn) {
                  _flags |= WaveformRectified;
            } else {
                  _flags &= ~WaveformRectified;
            }
            store_flags ();
      }
}

void
AudioRegionView::set_waveform_scale (WaveformScale scale)
{
      bool yn = (scale == LogWaveform);

      if (yn != (bool) (_flags & WaveformLogScaled)) {
            for (vector<WaveView *>::iterator wave = waves.begin(); wave != waves.end() ; ++wave) {
                  (*wave)->property_logscaled() = yn;
            }

            if (yn) {
                  _flags |= WaveformLogScaled;
            } else {
                  _flags &= ~WaveformLogScaled;
            }
            store_flags ();
      }
}


GhostRegion*
AudioRegionView::add_ghost (AutomationTimeAxisView& atv)
{
      RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(&trackview);
      assert(rtv);

      double unit_position = _region->position () / samples_per_unit;
      GhostRegion* ghost = new GhostRegion (atv, unit_position);
      uint32_t nchans;
      
      nchans = rtv->get_diskstream()->n_channels();

      for (uint32_t n = 0; n < nchans; ++n) {
            
            if (n >= audio_region()->n_channels()) {
                  break;
            }
            
            WaveView *wave = new WaveView(*ghost->group);

            wave->property_data_src() = _region.get();
            wave->property_cache() =  wave_caches[n];
            wave->property_cache_updater() = false;
            wave->property_channel() = n;
            wave->property_length_function() = (gpointer)region_length_from_c;
            wave->property_sourcefile_length_function() = (gpointer) sourcefile_length_from_c;
            wave->property_peak_function() =  (gpointer) region_read_peaks_from_c;
            wave->property_x() =  0.0;
            wave->property_samples_per_unit() =  samples_per_unit;
            wave->property_amplitude_above_axis() =  _amplitude_above_axis;
            wave->property_wave_color() = ARDOUR_UI::config()->canvasvar_GhostTrackWave.get();
            wave->property_clip_color() = ARDOUR_UI::config()->canvasvar_GhostTrackWaveClip.get();
            wave->property_zero_color() = ARDOUR_UI::config()->canvasvar_GhostTrackZeroLine.get();
            wave->property_region_start() = _region->start();

            ghost->waves.push_back(wave);
      }

      ghost->set_height ();
      ghost->set_duration (_region->length() / samples_per_unit);
      ghosts.push_back (ghost);

      ghost->GoingAway.connect (mem_fun(*this, &AudioRegionView::remove_ghost));

      return ghost;
}

void
AudioRegionView::entered ()
{
      if (gain_line && _flags & EnvelopeVisible) {
            gain_line->show_all_control_points ();
      }

      uint32_t r,g,b,a;
      UINT_TO_RGBA(fade_color,&r,&g,&b,&a);
      a=255;
      
      if (fade_in_handle) {
            fade_in_handle->property_fill_color_rgba() = RGBA_TO_UINT(r,g,b,a);
            fade_out_handle->property_fill_color_rgba() = RGBA_TO_UINT(r,g,b,a);
      }
}

void
AudioRegionView::exited ()
{
      if (gain_line) {
            gain_line->hide_all_but_selected_control_points ();
      }
      
      uint32_t r,g,b,a;
      UINT_TO_RGBA(fade_color,&r,&g,&b,&a);
      a=0;
      
      if (fade_in_handle) {
            fade_in_handle->property_fill_color_rgba() = RGBA_TO_UINT(r,g,b,a);
            fade_out_handle->property_fill_color_rgba() = RGBA_TO_UINT(r,g,b,a);
      }
}

void
AudioRegionView::envelope_active_changed ()
{
      if (gain_line) {
            gain_line->set_line_color (audio_region()->envelope_active() ? ARDOUR_UI::config()->canvasvar_GainLine.get() : ARDOUR_UI::config()->canvasvar_GainLineInactive.get());
      }
}

void
AudioRegionView::set_waveview_data_src()
{

      double unit_length= _region->length() / samples_per_unit;

      for (uint32_t n = 0; n < waves.size(); ++n) {
            // TODO: something else to let it know the channel
            waves[n]->property_data_src() = _region.get();
      }
      
      for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {
            
            (*i)->set_duration (unit_length);
            
            for (vector<WaveView*>::iterator w = (*i)->waves.begin(); w != (*i)->waves.end(); ++w) {
                  (*w)->property_data_src() = _region.get();
            }
      }

}

void
AudioRegionView::color_handler ()
{
      set_colors ();
      envelope_active_changed();
}


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