2 Copyright (C) 2002-2007 Paul Davis
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.
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.
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.
20 #include <libgnomecanvasmm/canvas.h>
21 #include <libgnomecanvasmm/group.h>
22 #include "tempo_lines.h"
23 #include "ardour_ui.h"
27 #define MAX_CACHED_LINES 128
29 TempoLines::TempoLines(ArdourCanvas::Canvas& canvas, ArdourCanvas::Group* group, double screen_height)
32 , _clean_left(DBL_MAX)
34 , _height(screen_height)
39 TempoLines::tempo_map_changed()
41 _clean_left = DBL_MAX;
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;
49 i->second->property_x1() = - d;
50 i->second->property_x2() = - d;
51 ArdourCanvas::SimpleLine* f = i->second;
53 _lines.insert(make_pair(- d, f));
61 for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
69 for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
75 TempoLines::draw (const ARDOUR::TempoMap::BBTPointList::const_iterator& begin,
76 const ARDOUR::TempoMap::BBTPointList::const_iterator& end,
77 double frames_per_unit)
79 ARDOUR::TempoMap::BBTPointList::const_iterator i;
80 ArdourCanvas::SimpleLine *line = NULL;
83 double x1, x2, y1, beat_density;
89 const size_t needed = distance (begin, end);
91 _canvas.get_scroll_region (x1, y1, x2, who_cares);
93 /* get the first bar spacing */
97 bars = (*i).bar - (*begin).bar;
98 beats = distance (begin, end) - bars;
100 beat_density = (beats * 10.0f) / _canvas.get_width ();
102 if (beat_density > 4.0f) {
103 /* if the lines are too close together, they become useless */
108 xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
109 const double needed_right = xpos;
113 xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
114 const double needed_left = xpos;
116 Lines::iterator left = _lines.lower_bound(xpos); // first line >= xpos
118 bool exhausted = (left == _lines.end());
119 Lines::iterator li = left;
120 if (li != _lines.end())
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;
130 //cout << endl << "*** LINE CACHE MISS" << endl;
132 bool invalidated = false;
134 for (i = begin; i != end; ++i) {
137 color = ARDOUR_UI::config()->canvasvar_MeasureLineBar.get();
139 if (beat_density > 2.0) {
140 continue; /* only draw beat lines if the gaps between beats are large. */
142 color = ARDOUR_UI::config()->canvasvar_MeasureLineBeat.get();
145 xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_unit);
147 li = _lines.lower_bound(xpos); // first line >= xpos
149 line = (li != _lines.end()) ? li->second : NULL;
150 assert(!line || line->property_x1() == li->first);
152 Lines::iterator next = li;
153 if (next != _lines.end())
156 exhausted = (next == _lines.end());
158 // Hooray, line is perfect
159 if (line && line->property_x1() == xpos) {
160 if (li != _lines.end())
163 line->property_color_rgba() = color;
164 // Use existing line, moving if necessary
165 } else if (!exhausted) {
166 Lines::iterator steal = _lines.end();
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;
175 line->property_x1() = xpos;
176 line->property_x2() = xpos;
177 line->property_color_rgba() = color;
178 _lines.insert(make_pair(xpos, line));
181 // Shift clean range left
182 _clean_left = min(_clean_left, xpos);
183 _clean_right = min(_clean_right, x);
185 // Move this line to where we need it
187 Lines::iterator existing = _lines.find(xpos);
188 if (existing != _lines.end()) {
189 //cout << "*** EXISTING LINE" << endl;
191 li->second->property_color_rgba() = color;
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;
201 line->property_color_rgba() = color;
202 line->property_x1() = xpos;
203 line->property_x2() = xpos;
204 _lines.insert(make_pair(xpos, 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));
222 // Steal from the left
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;
230 line->property_color_rgba() = color;
231 line->property_x1() = xpos;
232 line->property_x2() = xpos;
233 _lines.insert(make_pair(xpos, line));
236 // Shift clean range right
237 _clean_left = max(_clean_left, x);
238 _clean_right = max(_clean_right, xpos);
243 // Extend range to what we've 'fixed'
245 _clean_left = min(_clean_left, needed_left);
246 _clean_right = max(_clean_right, needed_right);