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livetrax/gtk2_ardour/tempo_lines.cc
Robin Gareus 4050ca5633
Update GPL boilerplate and (C)
Copyright-holder and year information is extracted from git log.

git history begins in 2005. So (C) from 1998..2005 is lost. Also some
(C) assignment of commits where the committer didn't use --author.
2019-08-03 15:53:15 +02:00

189 lines
5.5 KiB
C++

/*
* Copyright (C) 2007-2015 David Robillard <d@drobilla.net>
* Copyright (C) 2010-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2014-2017 Nick Mainsbridge <mainsbridge@gmail.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "pbd/compose.h"
#include "canvas/canvas.h"
#include "canvas/debug.h"
#include "tempo_lines.h"
#include "public_editor.h"
#include "rgb_macros.h"
#include "ui_config.h"
using namespace std;
TempoLines::TempoLines (ArdourCanvas::Container* group, double, ARDOUR::BeatsSamplesConverter* bfc)
: lines (group, ArdourCanvas::LineSet::Vertical)
, _bfc (bfc)
{
lines.set_extent (ArdourCanvas::COORD_MAX);
}
TempoLines::~TempoLines ()
{
delete _bfc;
_bfc = 0;
}
void
TempoLines::tempo_map_changed (samplepos_t new_origin)
{
lines.clear ();
_bfc->set_origin_b (new_origin);
}
void
TempoLines::show ()
{
lines.show ();
}
void
TempoLines::hide ()
{
lines.hide ();
}
void
TempoLines::draw_ticks (std::vector<ARDOUR::TempoMap::BBTPoint>& grid,
unsigned divisions,
samplecnt_t leftmost_sample,
samplecnt_t sample_rate)
{
const uint32_t base = UIConfiguration::instance().color_mod("measure line beat", "measure line beat");
for (unsigned l = 1; l < divisions; ++l) {
/* find the coarsest division level this tick falls on */
unsigned level = divisions;
for (unsigned d = divisions; d >= 4; d /= 2) {
if (l % (divisions / d) == 0) {
level = d;
}
}
/* draw line with alpha corresponding to coarsest level */
const uint8_t a = max(8, (int)rint(UINT_RGBA_A(base) / (0.8 * log2(level))));
const uint32_t c = UINT_RGBA_CHANGE_A(base, a);
const samplepos_t f = _bfc->to (Temporal::Beats (grid.begin()->qn + (l / (double) divisions))) + _bfc->origin_b();
if (f > leftmost_sample) {
lines.add (PublicEditor::instance().sample_to_pixel_unrounded (f), 1.0, c);
}
}
}
void
TempoLines::draw (std::vector<ARDOUR::TempoMap::BBTPoint>& grid,
unsigned divisions,
samplecnt_t leftmost_sample,
samplecnt_t sample_rate)
{
std::vector<ARDOUR::TempoMap::BBTPoint>::const_iterator i;
double beat_density;
uint32_t beats = 0;
uint32_t bars = 0;
const uint32_t bar_color = UIConfiguration::instance().color ("measure line bar");
const uint32_t beat_color = UIConfiguration::instance().color_mod ("measure line beat", "measure line beat");
uint32_t color;
bool all_bars = false;
/* get the first bar spacing */
i = grid.end();
i--;
bars = (*i).bar - (*grid.begin()).bar;
int32_t bar_mod = 4;
if (bars < distance (grid.begin(), grid.end()) - 1) {
/* grid contains beats and bars */
beats = distance (grid.begin(), grid.end()) - bars;
} else {
/* grid contains only bars */
beats = distance (grid.begin(), grid.end());
if (i != grid.begin()) {
const int32_t last_bar = (*i).bar;
i--;
bar_mod = (last_bar - (*i).bar) * 4;
}
all_bars = true;
}
double canvas_width_used = 1.0;
if (leftmost_sample < grid.front().sample) {
const samplecnt_t sample_distance = max ((samplecnt_t) 1, grid.back().sample - grid.front().sample);
canvas_width_used = 1.0 - ((grid.front().sample - leftmost_sample) / (double) (sample_distance + grid.front().sample));
}
beat_density = (beats * 10.0f) / (lines.canvas()->width() * canvas_width_used);
if (beat_density > 2.0f) {
/* if the lines are too close together, they become useless */
lines.clear ();
return;
}
/* constrain divisions to a log2 factor to cap line density */
while (divisions > 3 && beat_density * divisions > 0.4) {
divisions /= 2;
}
lines.clear ();
if (beat_density <= 0.12 && grid.begin() != grid.end() && grid.begin()->sample > 0 && !all_bars) {
/* draw subdivisions of the beat before the first visible beat line XX this shouldn't happen now */
std::vector<ARDOUR::TempoMap::BBTPoint> vec;
vec.push_back (*i);
draw_ticks (vec, divisions, leftmost_sample, sample_rate);
}
for (i = grid.begin(); i != grid.end(); ++i) {
if ((*i).is_bar()) {
/* keep all_bar beat density down */
if (all_bars && beat_density > 0.3 && ((*i).bar % bar_mod) != 1) {
continue;
}
color = bar_color;
} else {
if (beat_density > 0.3) {
continue; /* only draw beat lines if the gaps between beats are large. */
}
color = beat_color;
}
ArdourCanvas::Coord xpos = PublicEditor::instance().sample_to_pixel_unrounded ((*i).sample);
lines.add (xpos, 1.0, color);
if (beat_density <= 0.12 && !all_bars) {
/* draw subdivisions of this beat */
std::vector<ARDOUR::TempoMap::BBTPoint> vec;
vec.push_back (*i);
draw_ticks (vec, divisions, leftmost_sample, sample_rate);
}
}
}