251 lines
6.6 KiB
C++
251 lines
6.6 KiB
C++
/*
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Copyright (C) 2002-2007 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "canvas/line.h"
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#include "canvas/canvas.h"
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#include "canvas/debug.h"
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#include "tempo_lines.h"
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#include "ardour_ui.h"
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using namespace std;
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#define MAX_CACHED_LINES 128
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TempoLines::TempoLines (ArdourCanvas::GtkCanvasViewport& canvas_viewport, ArdourCanvas::Group* group, double screen_height)
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: _canvas_viewport (canvas_viewport)
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, _group(group)
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, _clean_left(DBL_MAX)
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, _clean_right(0.0)
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, _height(screen_height)
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{
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}
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void
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TempoLines::tempo_map_changed()
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{
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_clean_left = DBL_MAX;
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_clean_right = 0.0;
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double_t d = 1.0;
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// TODO: Dirty/slow, but 'needed' for zoom :(
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for (Lines::iterator i = _lines.begin(); i != _lines.end(); d += 1.0) {
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Lines::iterator next = i;
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++next;
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i->second->set_x0 (-d);
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i->second->set_x1 (-d);
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ArdourCanvas::Line* f = i->second;
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_lines.erase(i);
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_lines.insert(make_pair(- d, f));
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i = next;
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}
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}
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void
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TempoLines::show ()
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{
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for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
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i->second->show();
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}
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}
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void
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TempoLines::hide ()
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{
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for (Lines::iterator i = _lines.begin(); i != _lines.end(); ++i) {
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i->second->hide();
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}
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}
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void
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TempoLines::draw (const ARDOUR::TempoMap::BBTPointList::const_iterator& begin,
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const ARDOUR::TempoMap::BBTPointList::const_iterator& end,
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double frames_per_pixel)
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{
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ARDOUR::TempoMap::BBTPointList::const_iterator i;
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ArdourCanvas::Line *line = 0;
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gdouble xpos;
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double beat_density;
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uint32_t beats = 0;
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uint32_t bars = 0;
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uint32_t color;
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const size_t needed = distance (begin, end);
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ArdourCanvas::Rect const visible = _canvas_viewport.visible_area ();
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/* get the first bar spacing */
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i = end;
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i--;
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bars = (*i).bar - (*begin).bar;
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beats = distance (begin, end) - bars;
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beat_density = (beats * 10.0f) / visible.width ();
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if (beat_density > 4.0f) {
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/* if the lines are too close together, they become useless */
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tempo_map_changed();
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return;
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}
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xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_pixel);
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const double needed_right = xpos;
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i = begin;
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xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_pixel);
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const double needed_left = xpos;
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Lines::iterator left = _lines.lower_bound(xpos); // first line >= xpos
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bool exhausted = (left == _lines.end());
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Lines::iterator li = left;
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if (li != _lines.end())
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line = li->second;
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// Tempo map hasn't changed and we're entirely within a clean
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// range, don't need to do anything. Yay.
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if (needed_left >= _clean_left && needed_right <= _clean_right) {
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// cout << endl << "*** LINE CACHE PERFECT HIT" << endl;
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return;
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}
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//cout << endl << "*** LINE CACHE MISS" << endl;
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bool invalidated = false;
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for (i = begin; i != end; ++i) {
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if ((*i).is_bar()) {
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color = ARDOUR_UI::config()->canvasvar_MeasureLineBar.get();
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} else {
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if (beat_density > 2.0) {
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continue; /* only draw beat lines if the gaps between beats are large. */
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}
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color = ARDOUR_UI::config()->canvasvar_MeasureLineBeat.get();
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}
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xpos = rint(((framepos_t)(*i).frame) / (double)frames_per_pixel);
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li = _lines.lower_bound(xpos); // first line >= xpos
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line = (li != _lines.end()) ? li->second : 0;
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assert(!line || line->x0() == li->first);
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Lines::iterator next = li;
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if (next != _lines.end())
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++next;
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exhausted = (next == _lines.end());
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// Hooray, line is perfect
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if (line && line->x0() == xpos) {
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if (li != _lines.end())
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++li;
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line->set_outline_color (color);
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// Use existing line, moving if necessary
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} else if (!exhausted) {
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Lines::iterator steal = _lines.end();
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--steal;
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// Steal from the right
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if (left->first > needed_left && li != steal && steal->first > needed_right) {
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//cout << "*** STEALING FROM RIGHT" << endl;
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double const x = steal->first;
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line = steal->second;
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_lines.erase(steal);
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line->set_x0 (xpos);
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line->set_x1 (xpos);
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line->set_outline_color (color);
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_lines.insert(make_pair(xpos, line));
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invalidated = true;
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// Shift clean range left
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_clean_left = min(_clean_left, xpos);
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_clean_right = min(_clean_right, x);
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// Move this line to where we need it
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} else {
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Lines::iterator existing = _lines.find(xpos);
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if (existing != _lines.end()) {
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//cout << "*** EXISTING LINE" << endl;
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li = existing;
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li->second->set_outline_color (color);
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} else {
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//cout << "*** MOVING LINE" << endl;
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const double x1 = line->x0();
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const bool was_clean = x1 >= _clean_left && x1 <= _clean_right;
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invalidated = invalidated || was_clean;
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// Invalidate clean portion (XXX: too harsh?)
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_clean_left = needed_left;
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_clean_right = needed_right;
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_lines.erase(li);
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line->set_outline_color (color);
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line->set_x0 (xpos);
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line->set_x1 (xpos);
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_lines.insert(make_pair(xpos, line));
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}
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}
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// Create a new line
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} else if (_lines.size() < needed || _lines.size() < MAX_CACHED_LINES) {
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//cout << "*** CREATING LINE" << endl;
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/* if we already have a line there ... don't sweat it */
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if (_lines.find (xpos) == _lines.end()) {
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line = new ArdourCanvas::Line (_group);
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line->set_x0 (xpos);
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line->set_x1 (xpos);
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line->set_y0 (0.0);
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line->set_y1 (_height);
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line->set_outline_color (color);
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_lines.insert(make_pair(xpos, line));
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}
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// Steal from the left
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} else {
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//cout << "*** STEALING FROM LEFT" << endl;
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if (_lines.find (xpos) == _lines.end()) {
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Lines::iterator steal = _lines.begin();
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double const x = steal->first;
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line = steal->second;
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_lines.erase(steal);
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line->set_outline_color (color);
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line->set_x0 (xpos);
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line->set_x1 (xpos);
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_lines.insert(make_pair(xpos, line));
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invalidated = true;
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// Shift clean range right
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_clean_left = max(_clean_left, x);
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_clean_right = max(_clean_right, xpos);
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}
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}
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}
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// Extend range to what we've 'fixed'
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if (!invalidated) {
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_clean_left = min(_clean_left, needed_left);
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_clean_right = max(_clean_right, needed_right);
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}
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}
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