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Sourcecode: ardour version File versions

tempo_lines.cc

/*
    Copyright (C) 2002-2007 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 <libgnomecanvasmm/canvas.h>
#include <libgnomecanvasmm/group.h>
#include "tempo_lines.h"
#include "ardour_ui.h"

using namespace std;

#define MAX_CACHED_LINES 128
       
TempoLines::TempoLines(ArdourCanvas::Canvas& canvas, ArdourCanvas::Group* group, double screen_height)
      : _canvas(canvas)
      , _group(group)
      , _clean_left(DBL_MAX)
      , _clean_right(0.0)
      , _height(screen_height)
{
}

void
TempoLines::tempo_map_changed()
{
      _clean_left = DBL_MAX;
      _clean_right = 0.0;

      size_t d = 1;
      // TODO: Dirty/slow, but 'needed' for zoom :(
      for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++d) {
            Lines::iterator next = i;
            ++next;
            i->second->property_x1() = - d;
            i->second->property_x2() = - d;
            _lines.erase(i);
            _lines.insert(make_pair(- d, i->second));
            i = next;
      }
}

void
TempoLines::show ()
{
      for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
            i->second->show();
      }
}

void
TempoLines::hide ()
{
      for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
            i->second->hide();
      }
}

void
TempoLines::draw (ARDOUR::TempoMap::BBTPointList& points, double frames_per_unit)
{
      ARDOUR::TempoMap::BBTPointList::iterator i;
      ArdourCanvas::SimpleLine *line = NULL;
      gdouble xpos;
      double who_cares;
      double x1, x2, y1, beat_density;

      uint32_t beats = 0;
      uint32_t bars = 0;
      uint32_t color;

      const size_t needed = points.size();

      _canvas.get_scroll_region (x1, y1, x2, who_cares);

      /* get the first bar spacing */

      i = points.end();
      i--;
      bars = (*i).bar - (*points.begin()).bar;
      beats = points.size() - bars;

      beat_density = (beats * 10.0f) / _canvas.get_width ();

      if (beat_density > 4.0f) {
            /* if the lines are too close together, they become useless */
            //    tempo_map_changed();
            return;
      }

      xpos = rint(((nframes64_t)(*i).frame) / (double)frames_per_unit);
      const double needed_right = xpos;

      i = points.begin();
       
      xpos = rint(((nframes64_t)(*i).frame) / (double)frames_per_unit);
      const double needed_left = xpos;

      Lines::iterator left = _lines.lower_bound(xpos); // first line >= xpos

      bool exhausted = (left == _lines.end());
      Lines::iterator li = left;
      if (li != _lines.end()) {
            line = li->second;
      }
      // Tempo map hasn't changed and we're entirely within a clean
      // range, don't need to do anything.  Yay.
      if (needed_left >= _clean_left && needed_right <= _clean_right) {
            //cout << endl << "*** LINE CACHE PERFECT HIT" << endl;
            return;
      }

      //cout << endl << "*** LINE CACHE MISS" << endl;

      bool inserted_last_time = true;
      bool invalidated = false;
       
      for (i = points.begin(); i != points.end(); ++i) {

            switch ((*i).type) {
            case ARDOUR::TempoMap::Bar:
                  break;

            case ARDOUR::TempoMap::Beat:
                  if ((*i).beat == 1) {
                        color = ARDOUR_UI::config()->canvasvar_MeasureLineBar.get();
                  } else {
                        color = ARDOUR_UI::config()->canvasvar_MeasureLineBeat.get();
                        if (beat_density > 2.0) {
                              break; /* only draw beat lines if the gaps between beats are large. */
                        }
                  }

                  xpos = rint(((nframes64_t)(*i).frame) / (double)frames_per_unit);
                  if (inserted_last_time && !_lines.empty()) {
                        li = _lines.lower_bound(xpos); // first line >= xpos
                  }
                             
                  line = (li != _lines.end()) ? li->second : NULL;
                  assert(!line || line->property_x1() == li->first);
                               
                  Lines::iterator next = li;
                  if (next != _lines.end())
                        ++next;

                  exhausted = (next == _lines.end());
                  // Hooray, line is perfect                      
                  if (line && line->property_x1() == xpos) {
                        if (li != _lines.end())
                              ++li;

                        line->property_color_rgba() = color;
                        inserted_last_time = false; // don't search next time

                        // Use existing line, moving if necessary
                  } else if (!exhausted) {
                        Lines::iterator steal = _lines.end();
                        --steal;
                               
                        // Steal from the right
                        if (left->first > needed_left && li != steal && steal->first > needed_right) {
                              //cout << "*** STEALING FROM RIGHT" << endl;
                              line = steal->second;
                              _lines.erase(steal);
                              line->property_x1() = xpos;
                              line->property_x2() = xpos;
                              line->property_color_rgba() = color;
                              _lines.insert(make_pair(xpos, line));
                              inserted_last_time = true; // search next time
                              invalidated = true;

                              // Shift clean range left
                              _clean_left = min(_clean_left, xpos);
                              _clean_right = min(_clean_right, steal->first);

                              // Move this line to where we need it
                        } else {
                              Lines::iterator existing = _lines.find(xpos);
                              if (existing != _lines.end()) {
                                    //cout << "*** EXISTING LINE" << endl;
                                    li = existing;
                                    li->second->property_color_rgba() = color;
                                    inserted_last_time = false; // don't search next time
                              } else {
                                    //cout << "*** MOVING LINE" << endl;
                                    const double x1 = line->property_x1();
                                    const bool was_clean = x1 >= _clean_left && x1 <= _clean_right;
                                    invalidated = invalidated || was_clean;
                                    // Invalidate clean portion (XXX: too harsh?)
                                    _clean_left  = needed_left;
                                    _clean_right = needed_right;
                                    _lines.erase(li);
                                    line->property_color_rgba() = color;
                                    line->property_x1() = xpos;
                                    line->property_x2() = xpos;
                                    _lines.insert(make_pair(xpos, line));
                                    inserted_last_time = true; // search next time
                              }
                        }

                        // Create a new line
                  } else if (_lines.size() < needed || _lines.size() < MAX_CACHED_LINES) {
                        //cout << "*** CREATING LINE" << endl;
                        assert(_lines.find(xpos) == _lines.end());
                        line = new ArdourCanvas::SimpleLine (*_group);
                        line->property_x1() = xpos;
                        line->property_x2() = xpos;
                        line->property_y1() = 0.0;
                        line->property_y2() = _height;
                        line->property_color_rgba() = color;
                        _lines.insert(make_pair(xpos, line));
                        inserted_last_time = true;

                        // Steal from the left
                  } else {
                        //cout << "*** STEALING FROM LEFT" << endl;
                        assert(_lines.find(xpos) == _lines.end());
                        Lines::iterator steal = _lines.begin();
                        line = steal->second;
                        _lines.erase(steal);
                        line->property_color_rgba() = color;
                        line->property_x1() = xpos;
                        line->property_x2() = xpos;
                        _lines.insert(make_pair(xpos, line));
                        inserted_last_time = true; // search next time
                        invalidated = true;
                               
                        // Shift clean range right
                        _clean_left = max(_clean_left, steal->first);
                        _clean_right = max(_clean_right, xpos);
                  }

                  break;
            }
      }

      // Extend range to what we've 'fixed'
      if (!invalidated) {
            _clean_left  = min(_clean_left, needed_left);
            _clean_right = max(_clean_right, needed_right);
      }
}

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