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                 _lines.erase(i);
  52                 _lines.insert(make_pair(- d, i->second));
  53                 i = next;
  54         }
  55 }
  56
  57 void
  58 TempoLines::show ()
  59 {
  60         for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
  61                 i->second->show();
  62         }
  63 }
  64
  65 void
  66 TempoLines::hide ()
  67 {
  68         for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
  69                 i->second->hide();
  70         }
  71 }
  72
  73 void
  74 TempoLines::draw (ARDOUR::TempoMap::BBTPointList& points, double frames_per_unit)
  75 {
  76         ARDOUR::TempoMap::BBTPointList::iterator i;
  77         ArdourCanvas::SimpleLine *line = NULL;
  78         gdouble xpos;
  79         double who_cares;
  80         double x1, x2, y1, beat_density;
  81
  82         uint32_t beats = 0;
  83         uint32_t bars = 0;
  84         uint32_t color;
  85
  86         const size_t needed = points.size();
  87
  88         _canvas.get_scroll_region (x1, y1, x2, who_cares);
  89
  90         /* get the first bar spacing */
  91
  92         i = points.end();
  93         i--;
  94         bars = (*i).bar - (*points.begin()).bar;
  95         beats = points.size() - bars;
  96
  97         beat_density = (beats * 10.0f) / _canvas.get_width ();
  98
  99         if (beat_density > 4.0f) {
 100                 /* if the lines are too close together, they become useless */
 101                 tempo_map_changed();
 102                 return;
 103         }
 104
 105         xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
 106         const double needed_right = xpos;
 107
 108         i = points.begin();
 109
 110         xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
 111         const double needed_left = xpos;
 112
 113         Lines::iterator left = _lines.lower_bound(xpos); // first line >= xpos
 114
 115         bool exhausted = (left == _lines.end());
 116         Lines::iterator li = left;
 117         if (li != _lines.end())
 118                 line = li->second;
 119
 120         // Tempo map hasn't changed and we're entirely within a clean
 121         // range, don't need to do anything.  Yay.
 122         if (needed_left >= _clean_left && needed_right <= _clean_right) {
 123                 //cout << endl << "*** LINE CACHE PERFECT HIT" << endl;
 124                 return;
 125         }
 126
 127         //cout << endl << "*** LINE CACHE MISS" << endl;
 128
 129         bool inserted_last_time = true;
 130         bool invalidated = false;
 131
 132         for (i = points.begin(); i != points.end(); ++i) {
 133
 134                 switch ((*i).type) {
 135                 case ARDOUR::TempoMap::Bar:
 136                         break;
 137
 138                 case ARDOUR::TempoMap::Beat:
 139                         if ((*i).beat == 1) {
 140                                 color = ARDOUR_UI::config()->canvasvar_MeasureLineBar.get();
 141                         } else {
 142                                 color = ARDOUR_UI::config()->canvasvar_MeasureLineBeat.get();
 143                                 if (beat_density > 2.0) {
 144                                         break; /* only draw beat lines if the gaps between beats are large. */
 145                                 }
 146                         }
 147
 148                         xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
 149
 150                         if (inserted_last_time && !_lines.empty()) {
 151                                 li = _lines.lower_bound(xpos); // first line >= xpos
 152                         }
 153
 154                         line = (li != _lines.end()) ? li->second : NULL;
 155                         assert(!line || line->property_x1() == li->first);
 156
 157                         Lines::iterator next = li;
 158                         if (next != _lines.end())
 159                                 ++next;
 160
 161                         exhausted = (next == _lines.end());
 162
 163                         // Hooray, line is perfect
 164                         if (line && line->property_x1() == xpos) {
 165                                 if (li != _lines.end())
 166                                         ++li;
 167
 168                                 line->property_color_rgba() = color;
 169                                 inserted_last_time = false; // don't search next time
 170
 171                         // Use existing line, moving if necessary
 172                         } else if (!exhausted) {
 173                                 Lines::iterator steal = _lines.end();
 174                                 --steal;
 175
 176                                 // Steal from the right
 177                                 if (left->first > needed_left && li != steal && steal->first > needed_right) {
 178                                         //cout << "*** STEALING FROM RIGHT" << endl;
 179                                         line = steal->second;
 180                                         _lines.erase(steal);
 181                                         line->property_x1() = xpos;
 182                                         line->property_x2() = xpos;
 183                                         line->property_color_rgba() = color;
 184                                         _lines.insert(make_pair(xpos, line));
 185                                         inserted_last_time = true; // search next time
 186                                         invalidated = true;
 187
 188                                         // Shift clean range left
 189                                         _clean_left = min(_clean_left, xpos);
 190                                         _clean_right = min(_clean_right, steal->first);
 191
 192                                 // Move this line to where we need it
 193                                 } else {
 194                                         Lines::iterator existing = _lines.find(xpos);
 195                                         if (existing != _lines.end()) {
 196                                                 //cout << "*** EXISTING LINE" << endl;
 197                                                 li = existing;
 198                                                 li->second->property_color_rgba() = color;
 199                                                 inserted_last_time = false; // don't search next time
 200                                         } else {
 201                                                 //cout << "*** MOVING LINE" << endl;
 202                                                 const double x1 = line->property_x1();
 203                                                 const bool was_clean = x1 >= _clean_left && x1 <= _clean_right;
 204                                                 invalidated = invalidated || was_clean;
 205                                                 // Invalidate clean portion (XXX: too harsh?)
 206                                                 _clean_left  = needed_left;
 207                                                 _clean_right = needed_right;
 208                                                 _lines.erase(li);
 209                                                 line->property_color_rgba() = color;
 210                                                 line->property_x1() = xpos;
 211                                                 line->property_x2() = xpos;
 212                                                 _lines.insert(make_pair(xpos, line));
 213                                                 inserted_last_time = true; // search next time
 214                                         }
 215                                 }
 216
 217                         // Create a new line
 218                         } else if (_lines.size() < needed || _lines.size() < MAX_CACHED_LINES) {
 219                                 //cout << "*** CREATING LINE" << endl;
 220                                 assert(_lines.find(xpos) == _lines.end());
 221                                 line = new ArdourCanvas::SimpleLine (*_group);
 222                                 line->property_x1() = xpos;
 223                                 line->property_x2() = xpos;
 224                                 line->property_y1() = 0.0;
 225                                 line->property_y2() = _height;
 226                                 line->property_color_rgba() = color;
 227                                 _lines.insert(make_pair(xpos, line));
 228                                 inserted_last_time = true;
 229
 230                         // Steal from the left
 231                         } else {
 232                                 //cout << "*** STEALING FROM LEFT" << endl;
 233                                 assert(_lines.find(xpos) == _lines.end());
 234                                 Lines::iterator steal = _lines.begin();
 235                                 line = steal->second;
 236                                 _lines.erase(steal);
 237                                 line->property_color_rgba() = color;
 238                                 line->property_x1() = xpos;
 239                                 line->property_x2() = xpos;
 240                                 _lines.insert(make_pair(xpos, line));
 241                                 inserted_last_time = true; // search next time
 242                                 invalidated = true;
 243
 244                                 // Shift clean range right
 245                                 _clean_left = max(_clean_left, steal->first);
 246                                 _clean_right = max(_clean_right, xpos);
 247                         }
 248
 249                         break;
 250                 }
 251         }
 252
 253         // Extend range to what we've 'fixed'
 254         if (!invalidated) {
 255                 _clean_left  = min(_clean_left, needed_left);
 256                 _clean_right = max(_clean_right, needed_right);
 257         }
 258 }
 259