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livetrax/gtk2_ardour/region_peak_cursor.cc
Paul Davis ec7d502959 cairo single pixel line offset fix, part 2
This will need careful visual inspection of the items drawn by the
affected code to make sure they are still precisely as intended
2023-07-17 20:55:13 -06:00

148 lines
3.9 KiB
C++

/*
* Copyright (C) 2020 Robin Gareus <robin@gareus.org>
*
* 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 "canvas/arrow.h"
#include "canvas/tracking_text.h"
#include "ardour/audioregion.h"
#include "ardour/dB.h"
#include "audio_region_view.h"
#include "region_peak_cursor.h"
#include "ui_config.h"
#include "pbd/i18n.h"
using namespace std;
using namespace ARDOUR;
RegionPeakCursor::RegionPeakCursor (ArdourCanvas::Item* parent)
{
_canvas_text = new ArdourCanvas::Text (parent);
_canvas_text->set_outline (true);
_canvas_text->set_font_description (Pango::FontDescription (UIConfiguration::instance ().get_NormalMonospaceFont ()));
_canvas_text->set_ignore_events (true);
_canvas_line = new ArdourCanvas::Arrow (parent);
_canvas_line->set_show_head (0, true);
_canvas_line->set_show_head (1, true);
_canvas_line->set_ignore_events (true);
color_handler ();
UIConfiguration::instance ().ColorsChanged.connect (sigc::mem_fun (*this, &RegionPeakCursor::color_handler));
}
RegionPeakCursor::~RegionPeakCursor ()
{
#if 0
_canvas_text->unparent ();
delete _canvas_text;
_canvas_line->unparent ();
delete _canvas_line;
#endif
}
void
RegionPeakCursor::color_handler ()
{
_canvas_text->set_color (UIConfiguration::instance ().color ("gtk_foreground"));
}
void
RegionPeakCursor::show ()
{
_canvas_line->show ();
_canvas_line->raise_to_top ();
_canvas_text->show ();
_canvas_text->raise_to_top ();
_canvas_text->parent ()->raise_to_top ();
}
void
RegionPeakCursor::hide ()
{
_canvas_text->hide ();
_canvas_line->hide ();
}
void
RegionPeakCursor::set (AudioRegionView* arv, samplepos_t when, samplecnt_t samples_per_pixel)
{
std::shared_ptr<ARDOUR::AudioRegion> ar = std::dynamic_pointer_cast<ARDOUR::AudioRegion> (arv->region ());
assert (ar);
assert (ar->n_channels () > 0);
sampleoffset_t s = when - ar->position_sample ();
if (s < 0 || s > ar->length_samples ()) {
hide ();
return;
}
/* read_peaks() offset is relative to the region's source */
s += ar->start_sample ();
PeakData p;
/* no default constructor, since PeakData is POD */
p.min = 0;
p.max = 0;
for (uint32_t chn = 0; chn < ar->n_channels (); ++chn) {
PeakData pc;
ar->read_peaks (&pc, 1, s, samples_per_pixel, chn, samples_per_pixel);
if (chn == 0) {
p.min = pc.min;
p.max = pc.max;
} else {
p.min = std::min (p.min, pc.min);
p.max = std::max (p.max, pc.max);
}
}
char tmp[128];
sprintf (tmp, "%s %+.2f %5.1f %s\n%s %+.2f %5.1f %s\n",
_("Max:"), p.max,
accurate_coefficient_to_dB (fabsf (p.max)), _("dBFS"),
_("Min:"), p.min,
accurate_coefficient_to_dB (fabsf (p.min)), _("dBFS"));
_canvas_text->set (tmp);
/* position relative to editor origin */
ArdourCanvas::Duple pos = arv->get_canvas_group ()->item_to_window (_canvas_text->parent ()->position ());
double xpos = pos.x + floor ((double)(when - ar->position_sample ()) / samples_per_pixel);
_canvas_text->set_x_position (xpos + 3);
_canvas_text->set_y_position (pos.y + 3);
_canvas_line->set_x (xpos + 0.5);
_canvas_line->set_y0 (pos.y);
_canvas_line->set_y1 (pos.y + arv->height ());
if (!visible ()) {
show ();
}
}
bool
RegionPeakCursor::visible () const
{
return _canvas_text->visible ();
}