775 lines
19 KiB
C++
775 lines
19 KiB
C++
/*
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Copyright (C) 2011-2013 Paul Davis
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Author: Carl Hetherington <cth@carlh.net>
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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 <cmath>
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#include <cairomm/cairomm.h>
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#include <boost/scoped_array.hpp>
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#include "gtkmm2ext/utils.h"
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#include "pbd/compose.h"
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#include "pbd/signals.h"
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#include "pbd/stacktrace.h"
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#include "ardour/types.h"
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#include "ardour/dB.h"
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#include "ardour/audioregion.h"
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#include "canvas/wave_view.h"
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#include "canvas/utils.h"
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#include "canvas/canvas.h"
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#include <gdkmm/general.h>
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using namespace std;
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using namespace ARDOUR;
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using namespace ArdourCanvas;
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double WaveView::_global_gradient_depth = 0.6;
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bool WaveView::_global_logscaled = false;
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WaveView::Shape WaveView::_global_shape = WaveView::Normal;
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PBD::Signal0<void> WaveView::VisualPropertiesChanged;
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WaveView::WaveView (Group* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
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: Item (parent)
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, Outline (parent)
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, Fill (parent)
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, _region (region)
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, _channel (0)
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, _samples_per_pixel (0)
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, _height (64)
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, _wave_color (0xffffffff)
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, _show_zero (true)
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, _zero_color (0xff0000ff)
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, _clip_color (0xff0000ff)
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, _logscaled (_global_logscaled)
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, _shape (_global_shape)
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, _gradient_depth (_global_gradient_depth)
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, _shape_independent (false)
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, _logscaled_independent (false)
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, _gradient_depth_independent (false)
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, _amplitude_above_axis (1.0)
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, _region_start (region->start())
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, _cache (0)
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{
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VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
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}
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WaveView::~WaveView ()
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{
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delete _cache;
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_cache = 0;
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}
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void
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WaveView::handle_visual_property_change ()
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{
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bool changed = false;
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if (!_shape_independent && (_shape != global_shape())) {
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_shape = global_shape();
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changed = true;
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}
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if (!_logscaled_independent && (_logscaled != global_logscaled())) {
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_logscaled = global_logscaled();
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changed = true;
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}
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if (!_gradient_depth_independent && (_gradient_depth != global_gradient_depth())) {
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_gradient_depth = global_gradient_depth();
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changed = true;
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}
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if (changed) {
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invalidate_image_cache ();
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}
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}
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void
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WaveView::set_fill_color (Color c)
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{
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if (c != _fill_color) {
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invalidate_image_cache ();
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Fill::set_fill_color (c);
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}
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}
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void
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WaveView::set_outline_color (Color c)
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{
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if (c != _outline_color) {
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invalidate_image_cache ();
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Outline::set_outline_color (c);
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}
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}
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void
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WaveView::set_samples_per_pixel (double samples_per_pixel)
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{
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if (samples_per_pixel != _samples_per_pixel) {
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begin_change ();
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_samples_per_pixel = samples_per_pixel;
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_bounding_box_dirty = true;
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end_change ();
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invalidate_whole_cache ();
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}
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}
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static inline double
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image_to_window (double wave_origin, double image_start)
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{
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return wave_origin + image_start;
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}
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static inline double
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window_to_image (double wave_origin, double image_start)
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{
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return image_start - wave_origin;
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}
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void
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WaveView::ensure_cache (framecnt_t start, framecnt_t end,
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framepos_t sample_start, framepos_t sample_end) const
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{
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if (_cache && _cache->sample_start() <= sample_start && _cache->sample_end() >= sample_end) {
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/* cache already covers required range, do nothing */
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return;
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}
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if (_cache) {
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delete _cache;
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_cache = 0;
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}
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/* sample position is canonical here, and we want to generate
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* an image that spans about twice the canvas width
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*/
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const framepos_t center = sample_start + ((sample_end - sample_start) / 2);
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const framecnt_t canvas_samples = 2 * (_canvas->visible_area().width() * _samples_per_pixel);
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/* we can request data from anywhere in the Source, between 0 and its length
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*/
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sample_start = max ((framepos_t) 0, (center - canvas_samples));
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sample_end = min (center + canvas_samples, _region->source_length (0));
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if (sample_end <= sample_start) {
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cerr << "sample start = " << sample_start << endl;
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cerr << "center+ = " << center<< endl;
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cerr << "CS = " << canvas_samples << endl;
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cerr << "pui = " << center + canvas_samples << endl;
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cerr << "sl = " << _region->source_length (0) << endl;
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cerr << "st = " << _region->start () << endl;
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cerr << "END: " << sample_end << endl;
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assert (false);
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}
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start = floor (sample_start / (double) _samples_per_pixel);
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end = ceil (sample_end / (double) _samples_per_pixel);
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assert (end > start);
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cerr << name << " cache miss - new CE, span " << start << " .. " << end << " (" << sample_start << " .. " << sample_end << ")\n";
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_cache = new CacheEntry (this, start, end, sample_start, sample_end);
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}
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void
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WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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assert (_samples_per_pixel != 0);
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if (!_region) {
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return;
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}
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Rect self = item_to_window (Rect (0.0, 0.0, floor (_region->length() / _samples_per_pixel), _height));
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boost::optional<Rect> d = self.intersection (area);
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if (!d) {
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return;
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}
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Rect draw = d.get();
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/* window coordinates - pixels where x=0 is the left edge of the canvas
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* window. We round up and down in case we were asked to
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* draw "between" pixels at the start and/or end.
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*/
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const double draw_start = floor (draw.x0);
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const double draw_end = ceil (draw.x1);
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// cerr << "Need to draw " << draw_start << " .. " << draw_end << endl;
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/* image coordnates: pixels where x=0 is the start of this waveview,
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* wherever it may be positioned. thus image_start=N means "an image
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* that beings N pixels after the start of region that this waveview is
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* representing.
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*/
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const framepos_t image_start = window_to_image (self.x0, draw_start);
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const framepos_t image_end = window_to_image (self.x0, draw_end);
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// cerr << "Image/WV space: " << image_start << " .. " << image_end << endl;
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/* sample coordinates - note, these are not subject to rounding error */
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framepos_t sample_start = _region_start + (image_start * _samples_per_pixel);
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framepos_t sample_end = _region_start + (image_end * _samples_per_pixel);
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// cerr << "Sample space: " << sample_start << " .. " << sample_end << endl;
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ensure_cache (image_start, image_end, sample_start, sample_end);
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// cerr << "Cache contains " << _cache->pixel_start() << " .. " << _cache->pixel_end() << " / "
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// << _cache->sample_start() << " .. " << _cache->sample_end()
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// << endl;
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double image_offset = (_cache->sample_start() - _region->start()) / _samples_per_pixel;
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// cerr << "Offset into image to place at zero: " << image_offset << endl;
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context->rectangle (draw_start, draw.y0, draw_end - draw_start, draw.height());
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context->set_source (_cache->image(), self.x0 + image_offset, self.y0);
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context->fill ();
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}
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void
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WaveView::compute_bounding_box () const
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{
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if (_region) {
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_bounding_box = Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height);
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} else {
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_bounding_box = boost::optional<Rect> ();
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}
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_bounding_box_dirty = false;
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}
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void
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WaveView::set_height (Distance height)
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{
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if (height != _height) {
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begin_change ();
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_height = height;
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_bounding_box_dirty = true;
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end_change ();
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invalidate_image_cache ();
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}
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}
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void
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WaveView::set_channel (int channel)
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{
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if (channel != _channel) {
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begin_change ();
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_channel = channel;
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_bounding_box_dirty = true;
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end_change ();
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invalidate_whole_cache ();
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}
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}
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void
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WaveView::invalidate_whole_cache ()
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{
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begin_visual_change ();
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delete _cache;
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_cache = 0;
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end_visual_change ();
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}
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void
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WaveView::invalidate_image_cache ()
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{
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invalidate_whole_cache ();
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}
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void
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WaveView::set_logscaled (bool yn)
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{
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if (_logscaled != yn) {
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_logscaled = yn;
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invalidate_image_cache ();
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}
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}
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void
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WaveView::gain_changed ()
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{
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invalidate_whole_cache ();
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}
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void
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WaveView::set_zero_color (Color c)
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{
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if (_zero_color != c) {
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_zero_color = c;
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invalidate_image_cache ();
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}
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}
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void
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WaveView::set_clip_color (Color c)
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{
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if (_clip_color != c) {
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_clip_color = c;
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invalidate_image_cache ();
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}
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}
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void
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WaveView::set_show_zero_line (bool yn)
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{
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if (_show_zero != yn) {
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_show_zero = yn;
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invalidate_image_cache ();
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}
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}
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void
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WaveView::set_shape (Shape s)
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{
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if (_shape != s) {
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_shape = s;
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invalidate_image_cache ();
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}
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}
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void
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WaveView::set_amplitude_above_axis (double a)
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{
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if (_amplitude_above_axis != a) {
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_amplitude_above_axis = a;
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invalidate_image_cache ();
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}
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}
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void
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WaveView::set_global_shape (Shape s)
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{
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if (_global_shape != s) {
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_global_shape = s;
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VisualPropertiesChanged (); /* EMIT SIGNAL */
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}
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}
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void
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WaveView::set_global_logscaled (bool yn)
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{
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if (_global_logscaled != yn) {
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_global_logscaled = yn;
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VisualPropertiesChanged (); /* EMIT SIGNAL */
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}
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}
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void
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WaveView::region_resized ()
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{
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if (!_region) {
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return;
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}
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/* special: do not use _region->length() here to compute
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bounding box because it will already have changed.
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if we have a bounding box, use it.
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*/
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_pre_change_bounding_box = _bounding_box;
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frameoffset_t s = _region->start();
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if (s != _region_start) {
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/* if the region start changes, the information we have
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in the image cache is out of date and not useful
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since it will fragmented into little pieces. invalidate
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the cache.
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*/
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_region_start = _region->start();
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invalidate_whole_cache ();
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}
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_bounding_box_dirty = true;
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compute_bounding_box ();
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end_change ();
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}
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WaveView::CacheEntry::CacheEntry (WaveView const * wave_view, double pixel_start, double pixel_end,
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framepos_t sample_start,framepos_t sample_end)
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: _wave_view (wave_view)
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, _pixel_start (pixel_start)
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, _pixel_end (pixel_end)
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, _sample_start (sample_start)
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, _sample_end (sample_end)
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, _n_peaks (_pixel_end - _pixel_start)
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{
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_peaks.reset (new PeakData[_n_peaks]);
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_wave_view->_region->read_peaks (_peaks.get(), _n_peaks,
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_sample_start, _sample_end - _sample_start,
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_wave_view->_channel,
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_wave_view->_samples_per_pixel);
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}
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WaveView::CacheEntry::~CacheEntry ()
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{
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}
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static inline float
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_log_meter (float power, double lower_db, double upper_db, double non_linearity)
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{
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return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity));
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}
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static inline float
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alt_log_meter (float power)
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{
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return _log_meter (power, -192.0, 0.0, 8.0);
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}
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struct LineTips {
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double top;
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double bot;
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bool clipped;
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LineTips() : top (0.0), bot (0.0), clipped (false) {}
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};
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Cairo::RefPtr<Cairo::ImageSurface>
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WaveView::CacheEntry::image ()
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{
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if (!_image) {
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_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _n_peaks, _wave_view->_height);
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Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (_image);
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#ifdef AREA_DRAW_AND_FILL
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/* Draw the edge of the waveform, top half first, the loop back
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* for the bottom half to create a clockwise path
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*/
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context->begin_new_path();
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if (_wave_view->_shape == WaveView::Rectified) {
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/* top edge of waveform is based on max (fabs (peak_min, peak_max))
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*/
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if (_wave_view->_logscaled) {
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for (int i = 0; i < _n_peaks; ++i) {
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context->line_to (i + 0.5, position (alt_log_meter (fast_coefficient_to_dB (
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max (fabs (_peaks[i].max), fabs (_peaks[i].min))))));
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}
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} else {
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for (int i = 0; i < _n_peaks; ++i) {
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context->line_to (i + 0.5, position (max (fabs (_peaks[i].max), fabs (_peaks[i].min))));
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}
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}
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} else {
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if (_wave_view->_logscaled) {
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for (int i = 0; i < _n_peaks; ++i) {
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Coord y = _peaks[i].max;
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if (y > 0.0) {
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y = position (alt_log_meter (fast_coefficient_to_dB (y)));
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} else if (y < 0.0) {
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y = position (-alt_log_meter (fast_coefficient_to_dB (-y)));
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} else {
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y = position (0.0);
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}
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context->line_to (i + 0.5, y);
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}
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} else {
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for (int i = 0; i < _n_peaks; ++i) {
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context->line_to (i + 0.5, position (_peaks[i].max));
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}
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}
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}
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/* from final top point, move out of the clip zone */
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context->line_to (_n_peaks + 10, position (0.0));
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/* bottom half, in reverse */
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if (_wave_view->_shape == WaveView::Rectified) {
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/* lower half: drop to the bottom, then a line back to
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* beyond the left edge of the clip region
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*/
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context->line_to (_n_peaks + 10, _wave_view->_height);
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context->line_to (-10.0, _wave_view->_height);
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} else {
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if (_wave_view->_logscaled) {
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for (int i = _n_peaks-1; i >= 0; --i) {
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Coord y = _peaks[i].min;
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if (y > 0.0) {
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context->line_to (i + 0.5, position (alt_log_meter (fast_coefficient_to_dB (y))));
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} else if (y < 0.0) {
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context->line_to (i + 0.5, position (-alt_log_meter (fast_coefficient_to_dB (-y))));
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} else {
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context->line_to (i + 0.5, position (0.0));
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}
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}
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} else {
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for (int i = _n_peaks-1; i >= 0; --i) {
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context->line_to (i + 0.5, position (_peaks[i].min));
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}
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}
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|
/* from final bottom point, move out of the clip zone */
|
|
|
|
context->line_to (-10.0, position (0.0));
|
|
}
|
|
|
|
context->close_path ();
|
|
|
|
if (_wave_view->gradient_depth() != 0.0) {
|
|
|
|
Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _wave_view->_height));
|
|
|
|
double stops[3];
|
|
|
|
double r, g, b, a;
|
|
|
|
if (_wave_view->_shape == Rectified) {
|
|
stops[0] = 0.1;
|
|
stops[0] = 0.3;
|
|
stops[0] = 0.9;
|
|
} else {
|
|
stops[0] = 0.1;
|
|
stops[1] = 0.5;
|
|
stops[2] = 0.9;
|
|
}
|
|
|
|
color_to_rgba (_wave_view->_fill_color, r, g, b, a);
|
|
gradient->add_color_stop_rgba (stops[0], r, g, b, a);
|
|
gradient->add_color_stop_rgba (stops[2], r, g, b, a);
|
|
|
|
/* generate a new color for the middle of the gradient */
|
|
double h, s, v;
|
|
color_to_hsv (_wave_view->_fill_color, h, s, v);
|
|
/* tone down the saturation */
|
|
s *= 1.0 - _wave_view->gradient_depth();
|
|
Color center = hsv_to_color (h, s, v, a);
|
|
color_to_rgba (center, r, g, b, a);
|
|
gradient->add_color_stop_rgba (stops[1], r, g, b, a);
|
|
|
|
context->set_source (gradient);
|
|
} else {
|
|
set_source_rgba (context, _wave_view->_fill_color);
|
|
}
|
|
|
|
context->fill_preserve ();
|
|
_wave_view->setup_outline_context (context);
|
|
context->stroke ();
|
|
|
|
#else
|
|
cerr << "draw, logscaled = " << _wave_view->_logscaled << " global " << WaveView::_global_logscaled << endl;
|
|
cerr << "gradient depth: " << _wave_view->gradient_depth() << endl;
|
|
|
|
boost::scoped_array<LineTips> tips (new LineTips[_n_peaks]);
|
|
|
|
if (_wave_view->_shape == WaveView::Rectified) {
|
|
|
|
/* each peak is a line from the bottom of the waveview
|
|
* to a point determined by max (_peaks[i].max,
|
|
* _peaks[i].min)
|
|
*/
|
|
|
|
if (_wave_view->_logscaled) {
|
|
for (int i = 0; i < _n_peaks; ++i) {
|
|
tips[i].bot = _wave_view->height();
|
|
tips[i].top = position (alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min)))));
|
|
}
|
|
} else {
|
|
for (int i = 0; i < _n_peaks; ++i) {
|
|
tips[i].bot = _wave_view->height();
|
|
tips[i].top = position (max (fabs (_peaks[i].max), fabs (_peaks[i].min)));
|
|
}
|
|
}
|
|
|
|
} else {
|
|
|
|
if (_wave_view->_logscaled) {
|
|
for (int i = 0; i < _n_peaks; ++i) {
|
|
Coord top = _peaks[i].min;
|
|
Coord bot = _peaks[i].max;
|
|
|
|
if (top > 0.0) {
|
|
top = position (alt_log_meter (fast_coefficient_to_dB (top)));
|
|
} else if (top < 0.0) {
|
|
top = position (-alt_log_meter (fast_coefficient_to_dB (-top)));
|
|
} else {
|
|
top = position (0.0);
|
|
}
|
|
|
|
if (bot > 0.0) {
|
|
bot = position (alt_log_meter (fast_coefficient_to_dB (bot)));
|
|
} else if (bot < 0.0) {
|
|
bot = position (-alt_log_meter (fast_coefficient_to_dB (-bot)));
|
|
} else {
|
|
bot = position (0.0);
|
|
}
|
|
|
|
tips[i].top = top;
|
|
tips[i].bot = bot;
|
|
|
|
}
|
|
|
|
} else {
|
|
for (int i = 0; i < _n_peaks; ++i) {
|
|
tips[i].top = floor (position (_peaks[i].min));
|
|
tips[i].bot = ceil (position (_peaks[i].max));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (_wave_view->gradient_depth() != 0.0) {
|
|
|
|
Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _wave_view->_height));
|
|
|
|
double stops[3];
|
|
|
|
double r, g, b, a;
|
|
|
|
if (_wave_view->_shape == Rectified) {
|
|
stops[0] = 0.1;
|
|
stops[0] = 0.3;
|
|
stops[0] = 0.9;
|
|
} else {
|
|
stops[0] = 0.1;
|
|
stops[1] = 0.5;
|
|
stops[2] = 0.9;
|
|
}
|
|
|
|
color_to_rgba (_wave_view->_fill_color, r, g, b, a);
|
|
gradient->add_color_stop_rgba (stops[0], r, g, b, a);
|
|
gradient->add_color_stop_rgba (stops[2], r, g, b, a);
|
|
|
|
/* generate a new color for the middle of the gradient */
|
|
double h, s, v;
|
|
color_to_hsv (_wave_view->_fill_color, h, s, v);
|
|
/* tone down the saturation */
|
|
v *= 1.0 - _wave_view->gradient_depth();
|
|
Color center = hsv_to_color (h, s, v, a);
|
|
color_to_rgba (center, r, g, b, a);
|
|
gradient->add_color_stop_rgba (stops[1], r, g, b, a);
|
|
|
|
context->set_source (gradient);
|
|
} else {
|
|
cerr << "\tno gradient\n";
|
|
set_source_rgba (context, _wave_view->_fill_color);
|
|
}
|
|
|
|
context->set_line_width (0.5);
|
|
|
|
/* draw the lines */
|
|
|
|
if (_wave_view->_shape == WaveView::Rectified) {
|
|
for (int i = 0; i < _n_peaks; ++i) {
|
|
context->move_to (i + 0.5, tips[i].top + 0.5); /* down 1 pixel */
|
|
context->line_to (i + 0.5, tips[i].bot);
|
|
context->stroke ();
|
|
}
|
|
} else {
|
|
for (int i = 0; i < _n_peaks; ++i) {
|
|
context->move_to (i + 0.5, tips[i].top + 0.5); /* down 1 pixel */
|
|
context->line_to (i + 0.5, tips[i].bot - 0.5); /* up 1 pixel */
|
|
context->stroke ();
|
|
}
|
|
}
|
|
|
|
/* now add dots to the top and bottom of each line (this is
|
|
* modelled on pyramix, except that we add clipping indicators.
|
|
*/
|
|
|
|
context->set_source_rgb (0, 0, 0);
|
|
|
|
for (int i = 0; i < _n_peaks; ++i) {
|
|
context->rectangle (i + 0.5, tips[i].top, 0.5, 0.5);
|
|
context->fill ();
|
|
if (_wave_view->_shape != WaveView::Rectified) {
|
|
context->rectangle (i + 0.5, tips[i].bot, 0.5, 0.5);
|
|
context->fill ();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (_wave_view->show_zero_line()) {
|
|
set_source_rgba (context, _wave_view->_zero_color);
|
|
context->move_to (0, position (0.0));
|
|
context->line_to (_n_peaks, position (0.0));
|
|
context->stroke ();
|
|
}
|
|
|
|
}
|
|
|
|
return _image;
|
|
}
|
|
|
|
|
|
Coord
|
|
WaveView::CacheEntry::position (double s) const
|
|
{
|
|
switch (_wave_view->_shape) {
|
|
case Rectified:
|
|
return _wave_view->_height - (s * _wave_view->_height);
|
|
default:
|
|
break;
|
|
}
|
|
return (1.0-s) * (_wave_view->_height / 2.0);
|
|
}
|
|
|
|
void
|
|
WaveView::CacheEntry::clear_image ()
|
|
{
|
|
_image.clear ();
|
|
}
|
|
|
|
void
|
|
WaveView::set_global_gradient_depth (double depth)
|
|
{
|
|
if (_global_gradient_depth != depth) {
|
|
_global_gradient_depth = depth;
|
|
VisualPropertiesChanged (); /* EMIT SIGNAL */
|
|
}
|
|
}
|