gtk2_ardour/tempo_lines.cc

   1 /*
   2     Copyright (C) 2002-2007 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <libgnomecanvasmm/canvas.h>
  21 #include <libgnomecanvasmm/group.h>
  22 #include "tempo_lines.h"
  23 #include "ardour_ui.h"
  24
  25 using namespace std;
  26
  27 #define MAX_CACHED_LINES 128
  28
  29 TempoLines::TempoLines(ArdourCanvas::Canvas& canvas, ArdourCanvas::Group* group, double screen_height)
  30         : _canvas(canvas)
  31         , _group(group)
  32         , _clean_left(DBL_MAX)
  33         , _clean_right(0.0)
  34         , _height(screen_height)
  35 {
  36 }
  37
  38 void
  39 TempoLines::tempo_map_changed()
  40 {
  41         _clean_left = DBL_MAX;
  42         _clean_right = 0.0;
  43
  44         double_t d = 1.0;
  45         // TODO: Dirty/slow, but 'needed' for zoom :(
  46         for (Lines::iterator i = _lines.begin(); i != _lines.end(); d += 1.0) {
  47                 Lines::iterator next = i;
  48                 ++next;
  49                 i->second->property_x1() = - d;
  50                 i->second->property_x2() = - d;
  51                 ArdourCanvas::SimpleLine* f = i->second;
  52                 _lines.erase(i);
  53                 _lines.insert(make_pair(- d, f));
  54                 i = next;
  55         }
  56 }
  57
  58 void
  59 TempoLines::show ()
  60 {
  61         for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
  62                 i->second->show();
  63         }
  64 }
  65
  66 void
  67 TempoLines::hide ()
  68 {
  69         for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
  70                 i->second->hide();
  71         }
  72 }
  73
  74 void
  75 TempoLines::draw (const ARDOUR::TempoMap::BBTPointList::const_iterator& begin,
  76                   const ARDOUR::TempoMap::BBTPointList::const_iterator& end,
  77                   double frames_per_unit)
  78 {
  79         ARDOUR::TempoMap::BBTPointList::const_iterator i;
  80         ArdourCanvas::SimpleLine *line = NULL;
  81         gdouble xpos;
  82         double who_cares;
  83         double x1, x2, y1, beat_density;
  84
  85         uint32_t beats = 0;
  86         uint32_t bars = 0;
  87         uint32_t color;
  88
  89         const size_t needed = distance (begin, end);
  90
  91         _canvas.get_scroll_region (x1, y1, x2, who_cares);
  92
  93         /* get the first bar spacing */
  94
  95         i = end;
  96         i--;
  97         bars = (*i).bar - (*begin).bar;
  98         beats = distance (begin, end) - bars;
  99
 100         beat_density = (beats * 10.0f) / _canvas.get_width ();
 101
 102         if (beat_density > 4.0f) {
 103                 /* if the lines are too close together, they become useless */
 104                 tempo_map_changed();
 105                 return;
 106         }
 107
 108         xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
 109         const double needed_right = xpos;
 110
 111         i = begin;
 112
 113         xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
 114         const double needed_left = xpos;
 115
 116         Lines::iterator left = _lines.lower_bound(xpos); // first line >= xpos
 117
 118         bool exhausted = (left == _lines.end());
 119         Lines::iterator li = left;
 120         if (li != _lines.end())
 121                 line = li->second;
 122
 123         // Tempo map hasn't changed and we're entirely within a clean
 124         // range, don't need to do anything.  Yay.
 125         if (needed_left >= _clean_left && needed_right <= _clean_right) {
 126                 // cout << endl << "*** LINE CACHE PERFECT HIT" << endl;
 127                 return;
 128         }
 129
 130         //cout << endl << "*** LINE CACHE MISS" << endl;
 131
 132         bool invalidated = false;
 133
 134         for (i = begin; i != end; ++i) {
 135
 136                 if ((*i).is_bar()) {
 137                         color = ARDOUR_UI::config()->canvasvar_MeasureLineBar.get();
 138                 } else {
 139                         if (beat_density > 2.0) {
 140                                 continue; /* only draw beat lines if the gaps between beats are large. */
 141                         }
 142                         color = ARDOUR_UI::config()->canvasvar_MeasureLineBeat.get();
 143                 }
 144
 145                 xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
 146
 147                 li = _lines.lower_bound(xpos); // first line >= xpos
 148
 149                 line = (li != _lines.end()) ? li->second : NULL;
 150                 assert(!line || line->property_x1() == li->first);
 151
 152                 Lines::iterator next = li;
 153                 if (next != _lines.end())
 154                         ++next;
 155
 156                 exhausted = (next == _lines.end());
 157
 158                 // Hooray, line is perfect
 159                 if (line && line->property_x1() == xpos) {
 160                         if (li != _lines.end())
 161                                 ++li;
 162
 163                         line->property_color_rgba() = color;
 164                         // Use existing line, moving if necessary
 165                 } else if (!exhausted) {
 166                         Lines::iterator steal = _lines.end();
 167                         --steal;
 168
 169                         // Steal from the right
 170                         if (left->first > needed_left && li != steal && steal->first > needed_right) {
 171                                 //cout << "*** STEALING FROM RIGHT" << endl;
 172                                 double const x = steal->first;
 173                                 line = steal->second;
 174                                 _lines.erase(steal);
 175                                 line->property_x1() = xpos;
 176                                 line->property_x2() = xpos;
 177                                 line->property_color_rgba() = color;
 178                                 _lines.insert(make_pair(xpos, line));
 179                                 invalidated = true;
 180
 181                                 // Shift clean range left
 182                                 _clean_left = min(_clean_left, xpos);
 183                                 _clean_right = min(_clean_right, x);
 184
 185                                 // Move this line to where we need it
 186                         } else {
 187                                 Lines::iterator existing = _lines.find(xpos);
 188                                 if (existing != _lines.end()) {
 189                                         //cout << "*** EXISTING LINE" << endl;
 190                                         li = existing;
 191                                         li->second->property_color_rgba() = color;
 192                                 } else {
 193                                         //cout << "*** MOVING LINE" << endl;
 194                                         const double x1 = line->property_x1();
 195                                         const bool was_clean = x1 >= _clean_left && x1 <= _clean_right;
 196                                         invalidated = invalidated || was_clean;
 197                                         // Invalidate clean portion (XXX: too harsh?)
 198                                         _clean_left  = needed_left;
 199                                         _clean_right = needed_right;
 200                                         _lines.erase(li);
 201                                         line->property_color_rgba() = color;
 202                                         line->property_x1() = xpos;
 203                                         line->property_x2() = xpos;
 204                                         _lines.insert(make_pair(xpos, line));
 205                                 }
 206                         }
 207
 208                         // Create a new line
 209                 } else if (_lines.size() < needed || _lines.size() < MAX_CACHED_LINES) {
 210                         //cout << "*** CREATING LINE" << endl;
 211                         /* if we already have a line there ... don't sweat it */
 212                         if (_lines.find (xpos) == _lines.end()) {
 213                                 line = new ArdourCanvas::SimpleLine (*_group);
 214                                 line->property_x1() = xpos;
 215                                 line->property_x2() = xpos;
 216                                 line->property_y1() = 0.0;
 217                                 line->property_y2() = _height;
 218                                 line->property_color_rgba() = color;
 219                                 _lines.insert(make_pair(xpos, line));
 220                         }
 221
 222                         // Steal from the left
 223                 } else {
 224                         //cout << "*** STEALING FROM LEFT" << endl;
 225                         if (_lines.find (xpos) == _lines.end()) {
 226                                 Lines::iterator steal = _lines.begin();
 227                                 double const x = steal->first;
 228                                 line = steal->second;
 229                                 _lines.erase(steal);
 230                                 line->property_color_rgba() = color;
 231                                 line->property_x1() = xpos;
 232                                 line->property_x2() = xpos;
 233                                 _lines.insert(make_pair(xpos, line));
 234                                 invalidated = true;
 235
 236                                 // Shift clean range right
 237                                 _clean_left = max(_clean_left, x);
 238                                 _clean_right = max(_clean_right, xpos);
 239                         }
 240                 }
 241         }
 242
 243         // Extend range to what we've 'fixed'
 244         if (!invalidated) {
 245                 _clean_left  = min(_clean_left, needed_left);
 246                 _clean_right = max(_clean_right, needed_right);
 247         }
 248 }
 249