audio_region_view.cc

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/*
    Copyright (C) 2001-2006 Paul Davis

    This program is free software; you can r>edistribute 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 <vector>

#include <boost/scoped_array.hpp>

#include <gtkmm.h>

#include <gtkmm2ext/gtk_ui.h>

#include "ardour/playlist.h"
#include "ardour/audioregion.h"
#include "ardour/audiosource.h"
#include "ardour/profile.h"
#include "ardour/session.h"

#include "pbd/memento_command.h"
#include "pbd/stacktrace.h"

#include "evoral/Curve.hpp"

#include "canvas/rectangle.h"
#include "canvas/polygon.h"
#include "canvas/poly_line.h"
#include "canvas/line.h"
#include "canvas/text.h"
#include "canvas/xfade_curve.h"
#include "canvas/debug.h"
#include "canvas/utils.h"
#include "canvas/colors.h"

#include "streamview.h"
#include "audio_region_view.h"
#include "audio_time_axis.h"
#include "public_editor.h"
#include "audio_region_editor.h"
#include "audio_streamview.h"
#include "region_gain_line.h"
#include "control_point.h"
#include "ghostregion.h"
#include "audio_time_axis.h"
#include "rgb_macros.h"
#include "gui_thread.h"
#include "ardour_ui.h"

#include "i18n.h"

#define MUTED_ALPHA 48

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace Editing;
using namespace ArdourCanvas;

static double const handle_size = 10; /* height of fade handles */

AudioRegionView::AudioRegionView (ArdourCanvas::Container *parent, RouteTimeAxisView &tv, boost::shared_ptr<AudioRegion> r, double spu,
                                  uint32_t basic_color)
        : RegionView (parent, tv, r, spu, basic_color)
        , sync_mark(0)
        , fade_in_handle(0)
        , fade_out_handle(0)
        , fade_in_trim_handle(0)
        , fade_out_trim_handle(0)
        , start_xfade_curve (0)
        , start_xfade_rect (0)
        , _start_xfade_visible (false)
        , end_xfade_curve (0)
        , end_xfade_rect (0)
        , _end_xfade_visible (false)
        , _amplitude_above_axis(1.0)
        , trim_fade_in_drag_active(false)
        , trim_fade_out_drag_active(false)
{
        Config->ParameterChanged.connect (*this, invalidator (*this), boost::bind (&AudioRegionView::parameter_changed, this, _1), gui_context());
}

AudioRegionView::AudioRegionView (ArdourCanvas::Container *parent, RouteTimeAxisView &tv, boost::shared_ptr<AudioRegion> r, double spu,
                                  uint32_t basic_color, bool recording, TimeAxisViewItem::Visibility visibility)
        : RegionView (parent, tv, r, spu, basic_color, recording, visibility)
        , sync_mark(0)
        , fade_in_handle(0)
        , fade_out_handle(0)
        , fade_in_trim_handle(0)
        , fade_out_trim_handle(0)
        , start_xfade_curve (0)
        , start_xfade_rect (0)
        , _start_xfade_visible (false)
        , end_xfade_curve (0)
        , end_xfade_rect (0)
        , _end_xfade_visible (false)
        , _amplitude_above_axis(1.0)
        , trim_fade_in_drag_active(false)
        , trim_fade_out_drag_active(false)
{
        Config->ParameterChanged.connect (*this, invalidator (*this), boost::bind (&AudioRegionView::parameter_changed, this, _1), gui_context());
}

AudioRegionView::AudioRegionView (const AudioRegionView& other, boost::shared_ptr<AudioRegion> other_region)
        : RegionView (other, boost::shared_ptr<Region> (other_region))
        , fade_in_handle(0)
        , fade_out_handle(0)
        , fade_in_trim_handle(0)
        , fade_out_trim_handle(0)
        , start_xfade_curve (0)
        , start_xfade_rect (0)
        , _start_xfade_visible (false)
        , end_xfade_curve (0)
        , end_xfade_rect (0)
        , _end_xfade_visible (false)
        , _amplitude_above_axis (other._amplitude_above_axis)
        , trim_fade_in_drag_active(false)
        , trim_fade_out_drag_active(false)
{
        init (true);

        Config->ParameterChanged.connect (*this, invalidator (*this), boost::bind (&AudioRegionView::parameter_changed, this, _1), gui_context());
}

void
AudioRegionView::init (bool wfd)
{
        // FIXME: Some redundancy here with RegionView::init.  Need to figure out
        // where order is important and where it isn't...

        RegionView::init (wfd);

        _amplitude_above_axis = 1.0;

        create_waves ();

        if (!_recregion) {
                fade_in_handle = new ArdourCanvas::Rectangle (group);
                CANVAS_DEBUG_NAME (fade_in_handle, string_compose ("fade in handle for %1", region()->name()));
                fade_in_handle->set_outline_color (ArdourCanvas::rgba_to_color (0, 0, 0, 1.0));
                fade_in_handle->set_fill_color (ARDOUR_UI::config()->color ("inactive fade handle"));
                fade_in_handle->set_data ("regionview", this);
                fade_in_handle->hide ();

                fade_out_handle = new ArdourCanvas::Rectangle (group);
                CANVAS_DEBUG_NAME (fade_out_handle, string_compose ("fade out handle for %1", region()->name()));
                fade_out_handle->set_outline_color (ArdourCanvas::rgba_to_color (0, 0, 0, 1.0));
                fade_out_handle->set_fill_color (ARDOUR_UI::config()->color ("inactive fade handle"));
                fade_out_handle->set_data ("regionview", this);
                fade_out_handle->hide ();

                fade_in_trim_handle = new ArdourCanvas::Rectangle (group);
                CANVAS_DEBUG_NAME (fade_in_handle, string_compose ("fade in trim handle for %1", region()->name()));
                fade_in_trim_handle->set_outline_color (ArdourCanvas::rgba_to_color (0, 0, 0, 1.0));
                fade_in_trim_handle->set_fill_color (ARDOUR_UI::config()->color ("inactive fade handle"));
                fade_in_trim_handle->set_data ("regionview", this);
                fade_in_trim_handle->hide ();

                fade_out_trim_handle = new ArdourCanvas::Rectangle (group);
                CANVAS_DEBUG_NAME (fade_out_handle, string_compose ("fade out trim handle for %1", region()->name()));
                fade_out_trim_handle->set_outline_color (ArdourCanvas::rgba_to_color (0, 0, 0, 1.0));
                fade_out_trim_handle->set_fill_color (ARDOUR_UI::config()->color ("inactive fade handle"));
                fade_out_trim_handle->set_data ("regionview", this);
                fade_out_trim_handle->hide ();
        }

        setup_fade_handle_positions ();

        if (!trackview.session()->config.get_show_region_fades()) {
                set_fade_visibility (false);
        }

        const string line_name = _region->name() + ":gain";

        if (!Profile->get_sae()) {
                gain_line.reset (new AudioRegionGainLine (line_name, *this, *group, audio_region()->envelope()));
        }
        
        update_envelope_visibility ();
        gain_line->reset ();

        set_height (trackview.current_height());

        region_muted ();
        region_sync_changed ();

        region_resized (ARDOUR::bounds_change);

        for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {
                (*i)->set_duration (_region->length() / samples_per_pixel);
        }

        region_locked ();
        envelope_active_changed ();
        fade_in_active_changed ();
        fade_out_active_changed ();

        reset_width_dependent_items (_pixel_width);

        if (fade_in_handle) {
                fade_in_handle->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_in_handle_event), fade_in_handle, this, false));
        }

        if (fade_out_handle) {
                fade_out_handle->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_out_handle_event), fade_out_handle, this, false));
        }

        if (fade_in_trim_handle) {
                fade_in_trim_handle->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_in_handle_event), fade_in_trim_handle, this, true));
        }

        if (fade_out_trim_handle) {
                fade_out_trim_handle->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_out_handle_event), fade_out_trim_handle, this, true));
        }

        set_colors ();

        setup_waveform_visibility ();

        if (frame_handle_start) {
                frame_handle_start->raise_to_top ();
        }
        if (frame_handle_end) {
                frame_handle_end->raise_to_top ();
        }

        /* XXX sync mark drag? */
}

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

        RegionViewGoingAway (this); /* EMIT_SIGNAL */

        for (vector<ScopedConnection*>::iterator i = _data_ready_connections.begin(); i != _data_ready_connections.end(); ++i) {
                delete *i;
        }

        for (list<std::pair<framepos_t, ArdourCanvas::Line*> >::iterator i = feature_lines.begin(); i != feature_lines.end(); ++i) {
                delete ((*i).second);
        }

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

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

void
AudioRegionView::region_changed (const PropertyChange& what_changed)
{
        ENSURE_GUI_THREAD (*this, &AudioRegionView::region_changed, what_changed);

        RegionView::region_changed (what_changed);

        if (what_changed.contains (ARDOUR::Properties::scale_amplitude)) {
                region_scale_amplitude_changed ();
        }
        if (what_changed.contains (ARDOUR::Properties::fade_in)) {
                fade_in_changed ();
        }
        if (what_changed.contains (ARDOUR::Properties::fade_out)) {
                fade_out_changed ();
        }
        if (what_changed.contains (ARDOUR::Properties::fade_in_active)) {
                fade_in_active_changed ();
        }
        if (what_changed.contains (ARDOUR::Properties::fade_out_active)) {
                fade_out_active_changed ();
        }
        if (what_changed.contains (ARDOUR::Properties::envelope_active)) {
                envelope_active_changed ();
        }
        if (what_changed.contains (ARDOUR::Properties::valid_transients)) {
                transients_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 ()
{
        if (start_xfade_rect) {
                if (audio_region()->fade_in_active()) {
                        start_xfade_rect->set_fill (false);
                } else {
                        start_xfade_rect->set_fill_color (ARDOUR_UI::config()->color_mod ("inactive crossfade", "inactive crossfade"));
                        start_xfade_rect->set_fill (true);
                }
        }
}

void
AudioRegionView::fade_out_active_changed ()
{
        if (end_xfade_rect) {
                if (audio_region()->fade_out_active()) {
                        end_xfade_rect->set_fill (false);
                } else {        
                        end_xfade_rect->set_fill_color (ARDOUR_UI::config()->color_mod ("inactive crossfade", "inactive crossfade"));
                        end_xfade_rect->set_fill (true);
                }
        }
}


void
AudioRegionView::region_scale_amplitude_changed ()
{
        for (uint32_t n = 0; n < waves.size(); ++n) {
                waves[n]->gain_changed ();
        }
}

void
AudioRegionView::region_renamed ()
{
        std::string str = RegionView::make_name ();

        if (audio_region()->speed_mismatch (trackview.session()->frame_rate())) {
                str = string ("*") + str;
        }

        if (_region->muted()) {
                str = string ("!") + str;
        }

        set_item_name (str, this);
        set_name_text (str);
}

void
AudioRegionView::region_resized (const PropertyChange& what_changed)
{
        AudioGhostRegion* agr;

        RegionView::region_resized(what_changed);
        PropertyChange interesting_stuff;

        interesting_stuff.add (ARDOUR::Properties::start);
        interesting_stuff.add (ARDOUR::Properties::length);

        if (what_changed.contains (interesting_stuff)) {
                
                for (uint32_t n = 0; n < waves.size(); ++n) {
                        waves[n]->region_resized ();
                }

                for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {
                        if ((agr = dynamic_cast<AudioGhostRegion*>(*i)) != 0) {

                                for (vector<WaveView*>::iterator w = agr->waves.begin(); w != agr->waves.end(); ++w) {
                                        (*w)->region_resized ();
                                }
                        }
                }

                /* hide transient lines that extend beyond the region end */

                list<std::pair<framepos_t, ArdourCanvas::Line*> >::iterator l;

                for (l = feature_lines.begin(); l != feature_lines.end(); ++l) {
                        if (l->first > _region->length() - 1) {
                                l->second->hide();
                        } else {
                                l->second->show();
                        }
                }
        }
}

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

        if (pixel_width <= 20.0 || _height < 5.0 || !trackview.session()->config.get_show_region_fades()) {
                if (fade_in_handle)       { fade_in_handle->hide(); }
                if (fade_out_handle)      { fade_out_handle->hide(); }
                if (fade_in_trim_handle)  { fade_in_trim_handle->hide(); }
                if (fade_out_trim_handle) { fade_out_trim_handle->hide(); }
                if (start_xfade_rect)     { start_xfade_rect->set_outline (false); }
                if (end_xfade_rect)       { end_xfade_rect->set_outline (false); }
        }

        AnalysisFeatureList analysis_features = _region->transients();
        AnalysisFeatureList::const_iterator i;

        list<std::pair<framepos_t, ArdourCanvas::Line*> >::iterator l;

        for (i = analysis_features.begin(), l = feature_lines.begin(); i != analysis_features.end() && l != feature_lines.end(); ++i, ++l) {

                float x_pos = trackview.editor().sample_to_pixel (*i);

                (*l).second->set (ArdourCanvas::Duple (x_pos, 2.0),
                                  ArdourCanvas::Duple (x_pos, _height - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE - 1));

                (*l).first = *i;

                (*l).second->set (ArdourCanvas::Duple (x_pos, 2.0),
                                  ArdourCanvas::Duple (x_pos, _height - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE - 1));
        }

        reset_fade_shapes ();
}

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

void
AudioRegionView::setup_fade_handle_positions()
{
        /* position of fade handle offset from the top of the region view */
        double const handle_pos = 0.0;

        if (fade_in_handle) {
                fade_in_handle->set_y0 (handle_pos);
                fade_in_handle->set_y1 (handle_pos + handle_size);
        }

        if (fade_out_handle) {
                fade_out_handle->set_y0 (handle_pos);
                fade_out_handle->set_y1 (handle_pos + handle_size);
        }

        if (fade_in_trim_handle) {
                fade_in_trim_handle->set_y0 (_height - handle_size);
                fade_in_trim_handle->set_y1 (_height);
        }

        if (fade_out_trim_handle) {
                fade_out_trim_handle->set_y0 (_height - handle_size );
                fade_out_trim_handle->set_y1 (_height);
        }
}

void
AudioRegionView::set_height (gdouble height)
{
        RegionView::set_height (height);

        uint32_t wcnt = waves.size();

        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]->set_height (ht);
                waves[n]->set_y_position (yoff + 2);
        }

        if (gain_line) {

                if ((height/wcnt) < NAME_HIGHLIGHT_THRESH) {
                        gain_line->hide ();
                } else {
                        update_envelope_visibility ();
                }

                gain_line->set_height ((uint32_t) rint (height - NAME_HIGHLIGHT_SIZE) - 2);
        }

        reset_fade_shapes ();

        /* Update hights for any active feature lines */
        list<std::pair<framepos_t, ArdourCanvas::Line*> >::iterator l;

        for (l = feature_lines.begin(); l != feature_lines.end(); ++l) {

                float pos_x = trackview.editor().sample_to_pixel((*l).first);

                if (height >= NAME_HIGHLIGHT_THRESH) {
                        (*l).second->set (ArdourCanvas::Duple (pos_x, 2.0),
                                          ArdourCanvas::Duple (pos_x, _height - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE - 1));
                } else {
                        (*l).second->set (ArdourCanvas::Duple (pos_x, 2.0),
                                          ArdourCanvas::Duple (pos_x, _height - 1));
                }
        }

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

        setup_fade_handle_positions();
}

void
AudioRegionView::reset_fade_shapes ()
{
        if (!trim_fade_in_drag_active) { reset_fade_in_shape (); }
        if (!trim_fade_out_drag_active) { reset_fade_out_shape (); }
}

void
AudioRegionView::reset_fade_in_shape ()
{
        reset_fade_in_shape_width (audio_region(), (framecnt_t) audio_region()->fade_in()->back()->when);
}

void
AudioRegionView::reset_fade_in_shape_width (boost::shared_ptr<AudioRegion> ar, framecnt_t width, bool drag_active)
{
        trim_fade_in_drag_active = drag_active;
        if (fade_in_handle == 0) {
                return;
        }

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

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

        /* round here to prevent little visual glitches with sub-pixel placement */
        double const pwidth = floor (width / samples_per_pixel);
        double const handle_left = pwidth;

        /* Put the fade in handle so that its left side is at the end-of-fade line */
        fade_in_handle->set_x0 (handle_left);
        fade_in_handle->set_x1 (handle_left + handle_size);

        if (fade_in_trim_handle) {
                fade_in_trim_handle->set_x0 (0);
                fade_in_trim_handle->set_x1 (handle_size);
        }

        if (fade_in_handle->visible()) {
                //see comment for drag_start
                entered();
        }

        if (pwidth < 5) {
                hide_start_xfade();
                return;
        }

        if (!trackview.session()->config.get_show_region_fades()) {
                hide_start_xfade ();
                return;
        }
        
        double effective_height;

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

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

        Points points;
        Points::size_type pi;
        boost::shared_ptr<const Evoral::ControlList> list (audio_region()->fade_in());
        Evoral::ControlList::const_iterator x;
        double length = list->length();

        points.assign (list->size(), Duple());

        for (x = list->begin(), pi = 0; x != list->end(); ++x, ++pi) {
                points[pi].x = (pwidth * ((*x)->when/length));
                points[pi].y = effective_height - ((*x)->value * (effective_height - 1.));
        }

        /* draw the line */

        redraw_start_xfade_to (ar, width, points, effective_height, handle_left);

        /* ensure trim handle stays on top */
        if (frame_handle_start) {
                frame_handle_start->raise_to_top();
        }
}

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

void
AudioRegionView::reset_fade_out_shape_width (boost::shared_ptr<AudioRegion> ar, framecnt_t width, bool drag_active)
{
        trim_fade_out_drag_active = drag_active;
        if (fade_out_handle == 0) {
                return;
        }

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

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


        double const pwidth = floor(trackview.editor().sample_to_pixel (width));
        
        /* the right edge should be right on the region frame is the pixel
         * width is zero. Hence the additional + 1.0 at the end.
         */

        double const handle_right = rint(trackview.editor().sample_to_pixel (_region->length()) - pwidth);
        double const trim_handle_right = rint(trackview.editor().sample_to_pixel (_region->length()));

        /* Put the fade out handle so that its right side is at the end-of-fade line;
         */
        fade_out_handle->set_x0 (handle_right - handle_size);
        fade_out_handle->set_x1 (handle_right);
        if (fade_out_trim_handle) {
                fade_out_trim_handle->set_x0 (1 + trim_handle_right - handle_size);
                fade_out_trim_handle->set_x1 (1 + trim_handle_right);
        }

        if (fade_out_handle->visible()) {
                //see comment for drag_start
                entered();
        }
        /* don't show shape if its too small */

        if (pwidth < 5) {
                hide_end_xfade();
                return;
        }

        if (!trackview.session()->config.get_show_region_fades()) {
                hide_end_xfade();
                return;
        }

        double effective_height;

        effective_height = _height;

        if (ARDOUR_UI::config()->get_show_name_highlight() && effective_height >= NAME_HIGHLIGHT_THRESH) {
                effective_height -= NAME_HIGHLIGHT_SIZE;
        }

        /* points *MUST* be in anti-clockwise order */
        
        Points points;
        Points::size_type pi;
        boost::shared_ptr<const Evoral::ControlList> list (audio_region()->fade_out());
        Evoral::ControlList::const_iterator x;
        double length = list->length();

        points.assign (list->size(), Duple());
        
        for (x = list->begin(), pi = 0; x != list->end(); ++x, ++pi) {
                points[pi].x = _pixel_width - pwidth + (pwidth * ((*x)->when/length));
                points[pi].y = effective_height - ((*x)->value * (effective_height - 1.));
        }

        /* draw the line */

        redraw_end_xfade_to (ar, width, points, effective_height, handle_right, pwidth);

        /* ensure trim handle stays on top */
        if (frame_handle_end) {
                frame_handle_end->raise_to_top();
        }
}

framepos_t
AudioRegionView::get_fade_in_shape_width ()
{
        return audio_region()->fade_in()->back()->when;
}

framepos_t
AudioRegionView::get_fade_out_shape_width ()
{
        return audio_region()->fade_out()->back()->when;
}


void
AudioRegionView::redraw_start_xfade ()
{
        boost::shared_ptr<AudioRegion> ar (audio_region());

        if (!ar->fade_in() || ar->fade_in()->empty()) {
                return;
        }

        show_start_xfade();
        reset_fade_in_shape_width (ar, ar->fade_in()->back()->when);
}

void
AudioRegionView::redraw_start_xfade_to (boost::shared_ptr<AudioRegion> ar, framecnt_t /*width*/, Points& points, double effective_height,
                                        double rect_width)
{
        if (points.size() < 2) {
                return;
        }

        if (!start_xfade_curve) {
                start_xfade_curve = new ArdourCanvas::XFadeCurve (group, ArdourCanvas::XFadeCurve::Start);
                CANVAS_DEBUG_NAME (start_xfade_curve, string_compose ("xfade start out line for %1", region()->name()));
                start_xfade_curve->set_fill_color (ARDOUR_UI::config()->color_mod ("active crossfade", "crossfade alpha"));
                start_xfade_curve->set_outline_color (ARDOUR_UI::config()->color ("crossfade line"));
                start_xfade_curve->set_ignore_events (true);
        }
        if (!start_xfade_rect) {
                start_xfade_rect = new ArdourCanvas::Rectangle (group);
                CANVAS_DEBUG_NAME (start_xfade_rect, string_compose ("xfade start rect for %1", region()->name()));
                start_xfade_rect->set_outline_color (ARDOUR_UI::config()->color ("crossfade line"));
                start_xfade_rect->set_fill (false);
                start_xfade_rect->set_outline (false);
                start_xfade_rect->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_start_xfade_event), start_xfade_rect, this));
                start_xfade_rect->set_data ("regionview", this);
        }

        start_xfade_rect->set (ArdourCanvas::Rect (0.0, 0.0, rect_width, effective_height));

        /* fade out line */

        boost::shared_ptr<AutomationList> inverse = ar->inverse_fade_in ();
        Points ipoints;
        Points::size_type npoints;

        if (!inverse) {

                /* there is no explicit inverse fade in curve, so take the
                 * regular fade in curve given to use as "points" (already a
                 * set of coordinates), and convert to the inverse shape.
                 */

                npoints = points.size();
                ipoints.assign (npoints, Duple());

                for (Points::size_type i = 0, pci = 0; i < npoints; ++i, ++pci) {
                        ArdourCanvas::Duple &p (ipoints[pci]);
                        /* leave x-axis alone but invert with respect to y-axis */
                        p.y = effective_height - points[pci].y;
                }

        } else {

                /* there is an explicit inverse fade in curve. Grab the points
                   and convert them into coordinates for the inverse fade in
                   line.
                */

                npoints = inverse->size();
                ipoints.assign (npoints, Duple());
                
                Evoral::ControlList::const_iterator x;
                Points::size_type pi;
                double length = inverse->length();

                for (x = inverse->begin(), pi = 0; x != inverse->end(); ++x, ++pi) {
                        ArdourCanvas::Duple& p (ipoints[pi]);
                        p.x = (rect_width * ((*x)->when/length));
                        p.y = effective_height - ((*x)->value * (effective_height));
                }
        }

        start_xfade_curve->set_inout (points, ipoints);

        show_start_xfade();
}

void
AudioRegionView::redraw_end_xfade ()
{
        boost::shared_ptr<AudioRegion> ar (audio_region());

        if (!ar->fade_out() || ar->fade_out()->empty()) {
                return;
        }

        show_end_xfade();
        
        reset_fade_out_shape_width (ar, ar->fade_out()->back()->when);
}

void
AudioRegionView::redraw_end_xfade_to (boost::shared_ptr<AudioRegion> ar, framecnt_t width, Points& points, double effective_height,
                                      double rect_edge, double rect_width)
{
        if (points.size() < 2) {
                return;
        }

        if (!end_xfade_curve) {
                end_xfade_curve = new ArdourCanvas::XFadeCurve (group, ArdourCanvas::XFadeCurve::End);
                CANVAS_DEBUG_NAME (end_xfade_curve, string_compose ("xfade end out line for %1", region()->name()));
                end_xfade_curve->set_fill_color (ARDOUR_UI::config()->color_mod ("active crossfade", "crossfade alpha"));
                end_xfade_curve->set_outline_color (ARDOUR_UI::config()->color ("crossfade line"));
                end_xfade_curve->set_ignore_events (true);
        }

        if (!end_xfade_rect) {
                end_xfade_rect = new ArdourCanvas::Rectangle (group);
                CANVAS_DEBUG_NAME (end_xfade_rect, string_compose ("xfade end rect for %1", region()->name()));
                end_xfade_rect->set_outline_color (ARDOUR_UI::config()->color ("crossfade line"));
                end_xfade_rect->set_fill (false);
                end_xfade_rect->set_outline (false);
                end_xfade_rect->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_end_xfade_event), end_xfade_rect, this));
                end_xfade_rect->set_data ("regionview", this);
        }

        end_xfade_rect->set (ArdourCanvas::Rect (rect_edge, 0.0, rect_edge + rect_width, effective_height));

        /* fade in line */

        boost::shared_ptr<AutomationList> inverse = ar->inverse_fade_out ();
        Points ipoints;
        Points::size_type npoints;

        if (!inverse) {

                /* there is no explicit inverse fade out curve, so take the
                 * regular fade out curve given to use as "points" (already a
                 * set of coordinates), and convert to the inverse shape.
                 */

                npoints = points.size();
                ipoints.assign (npoints, Duple());

                Points::size_type pci;

                for (pci = 0; pci < npoints; ++pci) {
                        ArdourCanvas::Duple &p (ipoints[pci]);
                        p.y = effective_height - points[pci].y;
                }

        } else {

                /* there is an explicit inverse fade out curve. Grab the points
                   and convert them into coordinates for the inverse fade out
                   line.
                */

                npoints = inverse->size();
                ipoints.assign (npoints, Duple());
                
                const double rend = trackview.editor().sample_to_pixel (_region->length() - width);
                
                Evoral::ControlList::const_iterator x;
                Points::size_type pi;
                double length = inverse->length();

                for (x = inverse->begin(), pi = 0; x != inverse->end(); ++x, ++pi) {
                        ArdourCanvas::Duple& p (ipoints[pi]);
                        p.x = (rect_width * ((*x)->when/length)) + rend;
                        p.y = effective_height - ((*x)->value * (effective_height));
                }
        }

        end_xfade_curve->set_inout (ipoints, points);

        show_end_xfade();
}

void
AudioRegionView::hide_xfades ()
{
        hide_start_xfade ();
        hide_end_xfade ();
}

void
AudioRegionView::hide_start_xfade ()
{
        if (start_xfade_curve) {
                start_xfade_curve->hide();
        }
        if (start_xfade_rect) {
                start_xfade_rect->hide ();
        }

        _start_xfade_visible = false;
}

void
AudioRegionView::hide_end_xfade ()
{
        if (end_xfade_curve) {
                end_xfade_curve->hide();
        }
        if (end_xfade_rect) {
                end_xfade_rect->hide ();
        }

        _end_xfade_visible = false;
}

void
AudioRegionView::show_start_xfade ()
{
        if (start_xfade_curve) {
                start_xfade_curve->show();
        }
        if (start_xfade_rect) {
                start_xfade_rect->show ();
        }

        _start_xfade_visible = true;
}

void
AudioRegionView::show_end_xfade ()
{
        if (end_xfade_curve) {
                end_xfade_curve->show();
        }
        if (end_xfade_rect) {
                end_xfade_rect->show ();
        }

        _end_xfade_visible = true;
}

void
AudioRegionView::set_samples_per_pixel (gdouble fpp)
{
        RegionView::set_samples_per_pixel (fpp);

        if (ARDOUR_UI::config()->get_show_waveforms ()) {
                for (uint32_t n = 0; n < waves.size(); ++n) {
                        waves[n]->set_samples_per_pixel (fpp);
                }
        }

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

        reset_fade_shapes ();
}

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

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

        if (gain_line) {
                gain_line->set_line_color (audio_region()->envelope_active() ? 
                                           ARDOUR_UI::config()->color ("gain line") : 
                                           ARDOUR_UI::config()->color_mod ("gain line inactive", "gain line inactive"));
        }

        set_waveform_colors ();

        if (start_xfade_curve) {
                start_xfade_curve->set_fill_color (ARDOUR_UI::config()->color_mod ("active crossfade", "crossfade alpha"));
                start_xfade_curve->set_outline_color (ARDOUR_UI::config()->color ("crossfade line"));
        }
        if (end_xfade_curve) {
                end_xfade_curve->set_fill_color (ARDOUR_UI::config()->color_mod ("active crossfade", "crossfade alpha"));
                end_xfade_curve->set_outline_color (ARDOUR_UI::config()->color ("crossfade line"));
        }

        if (start_xfade_rect) {
                start_xfade_rect->set_outline_color (ARDOUR_UI::config()->color ("crossfade line"));
        }
        if (end_xfade_rect) {
                end_xfade_rect->set_outline_color (ARDOUR_UI::config()->color ("crossfade line"));
        }
}

void
AudioRegionView::setup_waveform_visibility ()
{
        if (ARDOUR_UI::config()->get_show_waveforms ()) {
                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.
                        */
                        // CAIROCANVAS
                        // waves[n]->set_samples_per_pixel (_samples_per_pixel);
                        waves[n]->show();
                }
        } else {
                for (uint32_t n = 0; n < waves.size(); ++n) {
                        waves[n]->hide();
                }
        }
}

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

void
AudioRegionView::unhide_envelope ()
{
        update_envelope_visibility ();
}

void
AudioRegionView::update_envelope_visibility ()
{
        if (!gain_line) {
                return;
        }

        if (ARDOUR_UI::config()->get_show_region_gain() || trackview.editor().current_mouse_mode() == Editing::MouseDraw || trackview.editor().current_mouse_mode() == Editing::MouseRange ) {
                gain_line->set_visibility (AutomationLine::VisibleAspects(AutomationLine::ControlPoints|AutomationLine::Line));
                gain_line->canvas_group().raise_to_top ();

        } else {
                gain_line->set_visibility (AutomationLine::VisibleAspects(0));
        }
}

void
AudioRegionView::create_waves ()
{
        // cerr << "AudioRegionView::create_waves() called on " << this << endl;//DEBUG
        RouteTimeAxisView& atv (*(dynamic_cast<RouteTimeAxisView*>(&trackview))); // ick

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

        ChanCount nchans = atv.track()->n_channels();

        // cerr << "creating waves for " << _region->name() << " with wfd = " << wait_for_data
        //              << " and channels = " << nchans.n_audio() << endl;

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

        for (vector<ScopedConnection*>::iterator i = _data_ready_connections.begin(); i != _data_ready_connections.end(); ++i) {
                delete *i;
        }

        _data_ready_connections.clear ();

        for (uint32_t i = 0; i < nchans.n_audio(); ++i) {
                _data_ready_connections.push_back (0);
        }

        for (uint32_t n = 0; n < nchans.n_audio(); ++n) {

                if (n >= audio_region()->n_channels()) {
                        break;
                }

                // cerr << "\tchannel " << n << endl;

                if (wait_for_data) {
                        if (audio_region()->audio_source(n)->peaks_ready (boost::bind (&AudioRegionView::peaks_ready_handler, this, n), &_data_ready_connections[n], gui_context())) {
                                // cerr << "\tData is ready\n";
                                create_one_wave (n, true);
                        } else {
                                // cerr << "\tdata is not ready\n";
                                // we'll get a PeaksReady signal from the source in the future
                                // and will call create_one_wave(n) then.
                        }

                } else {
                        // cerr << "\tdon't delay, display today!\n";
                        create_one_wave (n, true);
                }

        }
}

void
AudioRegionView::create_one_wave (uint32_t which, bool /*direct*/)
{
        //cerr << "AudioRegionView::create_one_wave() called which: " << which << " this: " << this << endl;//DEBUG
        RouteTimeAxisView& atv (*(dynamic_cast<RouteTimeAxisView*>(&trackview))); // ick
        uint32_t nchans = atv.track()->n_channels().n_audio();
        uint32_t n;
        uint32_t nwaves = std::min (nchans, audio_region()->n_channels());
        gdouble ht;

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

        gdouble yoff = which * ht;

        WaveView *wave = new WaveView (group, audio_region ());
        CANVAS_DEBUG_NAME (wave, string_compose ("wave view for chn %1 of %2", which, get_item_name()));
        
        wave->set_channel (which);
        wave->set_y_position (yoff);
        wave->set_height (ht);
        wave->set_samples_per_pixel (samples_per_pixel);
        wave->set_show_zero_line (true);
        wave->set_clip_level (ARDOUR_UI::config()->get_waveform_clip_level ());
        wave->set_start_shift (1.0);
        
        wave->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_wave_view_event), wave, this));
        
        switch (ARDOUR_UI::config()->get_waveform_shape()) {
        case Rectified:
                wave->set_shape (WaveView::Rectified);
                break;
        default:
                wave->set_shape (WaveView::Normal);
        }
                
        wave->set_logscaled (ARDOUR_UI::config()->get_waveform_scale() == Logarithmic);

        vector<ArdourCanvas::WaveView*> v;
        v.push_back (wave);
        set_some_waveform_colors (v);

        if (!ARDOUR_UI::config()->get_show_waveforms ()) {
                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 */
                delete _data_ready_connections[which];
                _data_ready_connections[which] = 0;
        }
}

void
AudioRegionView::peaks_ready_handler (uint32_t which)
{
        Gtkmm2ext::UI::instance()->call_slot (invalidator (*this), boost::bind (&AudioRegionView::create_one_wave, this, which, false));
        // cerr << "AudioRegionView::peaks_ready_handler() called on " << which << " this: " << this << endl;
}

void
AudioRegionView::add_gain_point_event (ArdourCanvas::Item *item, GdkEvent *ev, bool with_guard_points)
{
        if (!gain_line) {
                return;
        }

        double x, y;

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

        update_envelope_visibility ();

        x = ev->button.x;
        y = ev->button.y;

        item->canvas_to_item (x, y);

        framepos_t fx = trackview.editor().pixel_to_sample (x);

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

        /* compute vertical fractional position */

        y = 1.0 - (y / (_height - NAME_HIGHLIGHT_SIZE));

        /* map using gain line */

        gain_line->view_to_model_coord (x, y);

        /* XXX STATEFUL: can't convert to stateful diff until we
           can represent automation data with it.
        */

        trackview.editor().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, with_guard_points);

        XMLNode &after = audio_region()->envelope()->get_state();
        trackview.session()->add_command (new MementoCommand<AutomationList>(*audio_region()->envelope().get(), &before, &after));
        trackview.editor().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());
}

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

        double unit_position = _region->position () / samples_per_pixel;
        AudioGhostRegion* ghost = new AudioGhostRegion (tv, trackview, unit_position);
        uint32_t nchans;

        nchans = rtv->track()->n_channels().n_audio();

        for (uint32_t n = 0; n < nchans; ++n) {

                if (n >= audio_region()->n_channels()) {
                        break;
                }

                WaveView *wave = new WaveView (ghost->group, audio_region());
                CANVAS_DEBUG_NAME (wave, string_compose ("ghost wave for %1", get_item_name()));

                wave->set_channel (n);
                wave->set_samples_per_pixel (samples_per_pixel);
                wave->set_amplitude_above_axis (_amplitude_above_axis);

                ghost->waves.push_back(wave);
        }

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

        return ghost;
}

void
AudioRegionView::entered ()
{
        trackview.editor().set_current_trimmable (_region);
        trackview.editor().set_current_movable (_region);

        update_envelope_visibility();

        if ((trackview.editor().current_mouse_mode() == Editing::MouseObject)) {
                if (start_xfade_rect) {
                        start_xfade_rect->set_outline (true);
                }
                if (end_xfade_rect) {
                        end_xfade_rect->set_outline (true);
                }
                if (fade_in_handle) {
                        fade_in_handle->show ();
                        fade_in_handle->raise_to_top ();
                }
                if (fade_out_handle) {
                        fade_out_handle->show ();
                        fade_out_handle->raise_to_top ();
                }
                if (fade_in_trim_handle) {
                        boost::shared_ptr<AudioRegion> ar (audio_region());
                        if (!ar->locked() && (ar->fade_in()->back()->when > 64 || (ar->can_trim() & Trimmable::FrontTrimEarlier))) {
                                fade_in_trim_handle->show ();
                                fade_in_trim_handle->raise_to_top ();
                        } else {
                                fade_in_trim_handle->hide ();
                        }
                }
                if (fade_out_trim_handle) {
                        boost::shared_ptr<AudioRegion> ar (audio_region());
                        if (!ar->locked() && (ar->fade_out()->back()->when > 64 || (ar->can_trim() & Trimmable::EndTrimLater))) {
                                fade_out_trim_handle->show ();
                                fade_out_trim_handle->raise_to_top ();
                        } else {
                                fade_out_trim_handle->hide ();
                        }
                }
        }
}

void
AudioRegionView::exited ()
{
        trackview.editor().set_current_trimmable (boost::shared_ptr<Trimmable>());
        trackview.editor().set_current_movable (boost::shared_ptr<Movable>());

        if (gain_line) {
                gain_line->remove_visibility (AutomationLine::ControlPoints);
        }

        if (fade_in_handle)       { fade_in_handle->hide(); }
        if (fade_out_handle)      { fade_out_handle->hide(); }
        if (fade_in_trim_handle)  { fade_in_trim_handle->hide(); }
        if (fade_out_trim_handle) { fade_out_trim_handle->hide(); }
        if (start_xfade_rect)     { start_xfade_rect->set_outline (false); }
        if (end_xfade_rect)       { end_xfade_rect->set_outline (false); }
}

void
AudioRegionView::envelope_active_changed ()
{
        if (gain_line) {
                gain_line->set_line_color (audio_region()->envelope_active() ? 
                                           ARDOUR_UI::config()->color ("gain line") : 
                                           ARDOUR_UI::config()->color_mod ("gain line inactive", "gain line inactive"));
                update_envelope_visibility ();
        }
}

void
AudioRegionView::color_handler ()
{
        //case cMutedWaveForm:
        //case cWaveForm:
        //case cWaveFormClip:
        //case cZeroLine:
        set_colors ();

        //case cGainLineInactive:
        //case cGainLine:
        envelope_active_changed();

}

void
AudioRegionView::set_waveform_colors ()
{
        set_some_waveform_colors (waves);
}

void
AudioRegionView::set_some_waveform_colors (vector<ArdourCanvas::WaveView*>& waves_to_color)
{
        ArdourCanvas::Color fill;
        ArdourCanvas::Color outline;
        ArdourCanvas::Color clip = ARDOUR_UI::config()->color ("clipped waveform");
        ArdourCanvas::Color zero = ARDOUR_UI::config()->color ("zero line");

        if (_selected) {
                if (_region->muted()) {
                        /* hide outline with zero alpha */
                        outline = UINT_RGBA_CHANGE_A(ARDOUR_UI::config()->color ("selected waveform outline"), 0);
                        fill = UINT_RGBA_CHANGE_A(ARDOUR_UI::config()->color ("selected waveform fill"), MUTED_ALPHA);
                } else {
                        outline = ARDOUR_UI::config()->color ("selected waveform outline");
                        fill = ARDOUR_UI::config()->color ("selected waveform fill");
                }
        } else {
                if (_recregion) {
                        outline = ARDOUR_UI::config()->color ("recording waveform outline");
                        fill = ARDOUR_UI::config()->color ("recording waveform fill");
                } else {
                        if (_region->muted()) {
                                /* hide outline with zero alpha */
                                outline = UINT_RGBA_CHANGE_A(ARDOUR_UI::config()->color ("waveform outline"), 0);       
                                fill = UINT_RGBA_CHANGE_A(ARDOUR_UI::config()->color ("waveform fill"), MUTED_ALPHA);
                        } else {
                                outline = ARDOUR_UI::config()->color ("waveform outline");
                                fill = ARDOUR_UI::config()->color ("waveform fill");
                        }
                }
        }

        for (vector<ArdourCanvas::WaveView*>::iterator w = waves_to_color.begin(); w != waves_to_color.end(); ++w) {
                (*w)->set_fill_color (fill);
                (*w)->set_outline_color (outline);
                (*w)->set_clip_color (clip);
                (*w)->set_zero_color (zero);
        }
}

void
AudioRegionView::set_frame_color ()
{
        if (!frame) {
                return;
        }

        RegionView::set_frame_color ();

        set_waveform_colors ();
}

void
AudioRegionView::set_fade_visibility (bool yn)
{
        if (yn) {
                if (start_xfade_curve)    { start_xfade_curve->show (); }
                if (end_xfade_curve)      { end_xfade_curve->show (); }
                if (start_xfade_rect)     { start_xfade_rect->show (); }
                if (end_xfade_rect)       { end_xfade_rect->show (); }
                } else {
                if (start_xfade_curve)    { start_xfade_curve->hide(); }
                if (end_xfade_curve)      { end_xfade_curve->hide(); }
                if (fade_in_handle)       { fade_in_handle->hide(); }
                if (fade_out_handle)      { fade_out_handle->hide(); }
                if (fade_in_trim_handle)  { fade_in_trim_handle->hide(); }
                if (fade_out_trim_handle) { fade_out_trim_handle->hide(); }
                if (start_xfade_rect)     { start_xfade_rect->hide (); }
                if (end_xfade_rect)       { end_xfade_rect->hide (); }
                if (start_xfade_rect)     { start_xfade_rect->set_outline (false); }
                if (end_xfade_rect)       { end_xfade_rect->set_outline (false); }
        }
}

void
AudioRegionView::update_coverage_frames (LayerDisplay d)
{
        RegionView::update_coverage_frames (d);

        if (fade_in_handle)       { fade_in_handle->raise_to_top (); }
        if (fade_out_handle)      { fade_out_handle->raise_to_top (); }
        if (fade_in_trim_handle)  { fade_in_trim_handle->raise_to_top (); }
        if (fade_out_trim_handle) { fade_out_trim_handle->raise_to_top (); }
}

void
AudioRegionView::show_region_editor ()
{
        if (editor == 0) {
                editor = new AudioRegionEditor (trackview.session(), audio_region());
        }

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

void
AudioRegionView::transients_changed ()
{
        AnalysisFeatureList analysis_features = _region->transients();

        while (feature_lines.size() < analysis_features.size()) {

                ArdourCanvas::Line* canvas_item = new ArdourCanvas::Line(group);
                CANVAS_DEBUG_NAME (canvas_item, string_compose ("transient group for %1", region()->name()));

                canvas_item->set (ArdourCanvas::Duple (-1.0, 2.0),
                                  ArdourCanvas::Duple (1.0, _height - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE - 1));

                canvas_item->raise_to_top ();
                canvas_item->show ();

                canvas_item->set_data ("regionview", this);
                canvas_item->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_feature_line_event), canvas_item, this));

                feature_lines.push_back (make_pair(0, canvas_item));
        }

        while (feature_lines.size() > analysis_features.size()) {
                ArdourCanvas::Line* line = feature_lines.back().second;
                feature_lines.pop_back ();
                delete line;
        }

        AnalysisFeatureList::const_iterator i;
        list<std::pair<framepos_t, ArdourCanvas::Line*> >::iterator l;

        for (i = analysis_features.begin(), l = feature_lines.begin(); i != analysis_features.end() && l != feature_lines.end(); ++i, ++l) {

                float *pos = new float;
                *pos = trackview.editor().sample_to_pixel (*i);

                (*l).second->set (
                        ArdourCanvas::Duple (*pos, 2.0),
                        ArdourCanvas::Duple (*pos, _height - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE - 1)
                        );

                (*l).second->set_data ("position", pos);
                (*l).first = *i;
        }
}

void
AudioRegionView::update_transient(float /*old_pos*/, float new_pos)
{
        /* Find frame at old pos, calulate new frame then update region transients*/
        list<std::pair<framepos_t, ArdourCanvas::Line*> >::iterator l;

        for (l = feature_lines.begin(); l != feature_lines.end(); ++l) {

                /* Line has been updated in drag so we compare to new_pos */

                float* pos = (float*) (*l).second->get_data ("position");

                if (rint(new_pos) == rint(*pos)) {

                    framepos_t old_frame = (*l).first;
                    framepos_t new_frame = trackview.editor().pixel_to_sample (new_pos);

                    _region->update_transient (old_frame, new_frame);

                    break;
                }
        }
}

void
AudioRegionView::remove_transient(float pos)
{
        /* Find frame at old pos, calulate new frame then update region transients*/
        list<std::pair<framepos_t, ArdourCanvas::Line*> >::iterator l;

        for (l = feature_lines.begin(); l != feature_lines.end(); ++l) {

                /* Line has been updated in drag so we compare to new_pos */
                float *line_pos = (float*) (*l).second->get_data ("position");

                if (rint(pos) == rint(*line_pos)) {
                    _region->remove_transient ((*l).first);
                    break;
                }
        }
}

void
AudioRegionView::thaw_after_trim ()
{
        RegionView::thaw_after_trim ();
        unhide_envelope ();
        drag_end ();
}


void
AudioRegionView::show_xfades ()
{
        show_start_xfade ();
        show_end_xfade ();
}

void
AudioRegionView::drag_start ()
{
        TimeAxisViewItem::drag_start ();

        //we used to hide xfades here.  I don't see the point with the new model, but we can re-implement if needed
}

void
AudioRegionView::drag_end ()
{
        TimeAxisViewItem::drag_end ();
        //see comment for drag_start

        if (fade_in_handle && fade_in_handle->visible()) {
                // lenght of region or fade changed, re-check
                // if fade_in_trim_handle or fade_out_trim_handle should
                // be visible. -- If the fade_in_handle is visible
                // we have focus and are not in internal edit mode.
                entered();
        }
}

void
AudioRegionView::parameter_changed (string const & p)
{
        if (p == "show-waveforms") {
                setup_waveform_visibility ();
        }
}