Logo Search packages:      
Sourcecode: ardour version File versions  Download package

crossfade_view.cc

/*
    Copyright (C) 2003 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.

    $Id: crossfade_view.cc,v 1.27 2005/04/30 18:06:09 pauld Exp $
*/

#include <algorithm>

#include <ardour/region.h>
#include <gtkmmext/doi.h>

#include "canvas-simplerect.h"
#include "canvas-curve.h"
#include "crossfade_view.h"
#include "rgb_macros.h"
#include "audio_time_axis.h"
#include "public_editor.h"
#include "regionview.h"
#include "utils.h"

using namespace SigC;
using namespace ARDOUR;
using namespace Editing;

SigC::Signal1<void,CrossfadeView*> CrossfadeView::GoingAway;

CrossfadeView::CrossfadeView (GtkCanvasGroup *parent, 
                        AudioTimeAxisView &tv, 
                        Crossfade& xf, 
                        double spu,
                        GdkColor& basic_color,
                        AudioRegionView& lview,
                        AudioRegionView& rview)
                        

      : TimeAxisViewItem ("xf.name()", parent, tv, spu, basic_color, xf.position(), 
                      xf.overlap_length(), TimeAxisViewItem::Visibility (TimeAxisViewItem::ShowFrame)),
        crossfade (xf),
        left_view (lview),
        right_view (rview)
      
{
      _valid = true;
      _visible = true;

      fade_in = gtk_canvas_item_new (GTK_CANVAS_GROUP(group),
                               gtk_canvas_line_get_type(),
                               "fill_color_rgba", color_map[cCrossfadeLine],
                              "width_pixels", (guint) 1,
                               NULL);

      fade_out = gtk_canvas_item_new (GTK_CANVAS_GROUP(group),
                              gtk_canvas_line_get_type(),
                              "fill_color_rgba", color_map[cCrossfadeLine],
                              "width_pixels", (guint) 1,
                              NULL);
      
      set_height (get_time_axis_view().height);

      /* no frame around the xfade or overlap rects */

      gtk_canvas_item_set (frame, "outline_what", 0, NULL);

      /* never show the vestigial frame */

      gtk_canvas_item_hide (vestigial_frame);
      show_vestigial = false;

      gtk_object_set_data (GTK_OBJECT(group), "crossfadeview", this);
      gtk_signal_connect (GTK_OBJECT(group), "event",
                      (GtkSignalFunc) PublicEditor::canvas_crossfade_view_event,
                      this);

      crossfade_changed (Change (~0));

      crossfade.StateChanged.connect (slot (*this, &CrossfadeView::crossfade_changed));
}

CrossfadeView::~CrossfadeView ()
{
       GoingAway (this) ; /* EMIT_SIGNAL */
}

std::string
CrossfadeView::get_item_name ()
{
      return "xfade";
//    return crossfade.name();
}

void
CrossfadeView::reset_width_dependent_items (double pixel_width)
{
      TimeAxisViewItem::reset_width_dependent_items (pixel_width);

      active_changed ();

      if (pixel_width < 5) {
            gtk_canvas_item_hide (fade_in);
            gtk_canvas_item_hide (fade_out);
      }
}

void
CrossfadeView::set_height (double height)
{
      if (height == TimeAxisView::Smaller ||
            height == TimeAxisView::Small)
            TimeAxisViewItem::set_height (height - 3 );
      else
            TimeAxisViewItem::set_height (height - NAME_HIGHLIGHT_SIZE - 3 );

      redraw_curves ();
}

void
CrossfadeView::crossfade_changed (Change what_changed)
{
      bool need_redraw_curves = false;

      if (what_changed & BoundsChanged) {
            set_position (crossfade.position(), this);
            set_duration (crossfade.overlap_length(), this);
            need_redraw_curves = true;
      }
      
      if (what_changed & Crossfade::ActiveChanged) {
            /* calls redraw_curves */
            active_changed ();
      } else if (need_redraw_curves) {
            redraw_curves ();
      }
}

void
CrossfadeView::redraw_curves ()
{
      GtkCanvasPoints* points; 
      int32_t npoints;
      float* vec;
      
      double h;

      /*
       At "height - 3.0" the bottom of the crossfade touches the name highlight or the bottom of the track (if the
       track is either Small or Smaller.
       */
      switch(get_time_axis_view().height) {
            case TimeAxisView::Smaller:
            case TimeAxisView::Small:
                  h = get_time_axis_view().height - 3.0;
                  break;

            default:
                  h = get_time_axis_view().height - NAME_HIGHLIGHT_SIZE - 3.0;
      }

      if (h < 0) {
            /* no space allocated yet */
            return;
      }

      npoints = get_time_axis_view().editor.frame_to_pixel (crossfade.length());
      npoints = std::min (gdk_screen_width(), npoints);

      if (!_visible || !crossfade.active() || npoints < 3) {
            gtk_canvas_item_hide (fade_in);
            gtk_canvas_item_hide (fade_out);
            return;
      } else {
            gtk_canvas_item_show (fade_in);
            gtk_canvas_item_show (fade_out);
      } 

      points = get_canvas_points ("xfade edit redraw", npoints);
      vec = new float[npoints];

      crossfade.fade_in().get_vector (0, crossfade.length(), vec, npoints);
      for (int i = 0, pci = 0; i < npoints; ++i) {
            points->coords[pci++] = i;
            points->coords[pci++] = 2.0 + h - (h * vec[i]);
      }
      gtk_canvas_item_set (fade_in, "points", points, NULL);

      crossfade.fade_out().get_vector (0, crossfade.length(), vec, npoints);
      for (int i = 0, pci = 0; i < npoints; ++i) {
            points->coords[pci++] = i;
            points->coords[pci++] = 2.0 + h - (h * vec[i]);
      }
      gtk_canvas_item_set (fade_out, "points", points, NULL);

      delete [] vec;

      gtk_canvas_points_unref (points);

      /* XXX this is ugly, but it will have to wait till Crossfades are reimplented
         as regions. This puts crossfade views on top of a track, above all regions.
      */

      gtk_canvas_item_raise_to_top (group);
}

void
CrossfadeView::active_changed ()
{
      if (crossfade.active()) {
            gtk_canvas_item_set (frame, "fill_color_rgba", color_map[cActiveCrossfade], NULL);
      } else {
            gtk_canvas_item_set (frame, "fill_color_rgba", color_map[cInactiveCrossfade], NULL);
      }

      redraw_curves ();
}

void
CrossfadeView::set_valid (bool yn)
{
      _valid = yn;
}

AudioRegionView&
CrossfadeView::upper_regionview () const
{
      if (left_view.region.layer() > right_view.region.layer()) {
            return left_view;
      } else {
            return right_view;
      }
}

void
CrossfadeView::show ()
{
      gtk_canvas_item_show (group);
      _visible = true;
}

void
CrossfadeView::hide ()
{
      gtk_canvas_item_hide (group);
      _visible = false;
}

void
CrossfadeView::fake_hide ()
{
      gtk_canvas_item_hide (group);
}

Generated by  Doxygen 1.6.0   Back to index