575 lines
12 KiB
C++
575 lines
12 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 "gtkmm2ext/utils.h"
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#include "pbd/compose.h"
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#include "pbd/signals.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 (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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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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invalidate_image_cache ();
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Fill::set_fill_color (c);
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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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invalidate_image_cache ();
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Outline::set_outline_color (c);
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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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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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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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/* p, start and end are offsets from the start of the source.
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area is relative to the position of the region.
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*/
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int const start = rint (area.x0 + _region_start / _samples_per_pixel);
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int const end = rint (area.x1 + _region_start / _samples_per_pixel);
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int p = start;
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list<CacheEntry*>::iterator cache = _cache.begin ();
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while (p < end) {
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/* Step through cache entries that end at or before our current position, p */
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while (cache != _cache.end() && (*cache)->end() <= p) {
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++cache;
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}
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/* Now either:
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1. we have run out of cache entries
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2. the one we are looking at finishes after p but also starts after p.
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3. the one we are looking at finishes after p and starts before p.
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Set up a pointer to the cache entry that we will use on this iteration.
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*/
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CacheEntry* render = 0;
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if (cache == _cache.end ()) {
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/* Case 1: we have run out of cache entries, so make a new one for
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the whole required area and put it in the list.
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*/
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CacheEntry* c = new CacheEntry (this, p, end);
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_cache.push_back (c);
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render = c;
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} else if ((*cache)->start() > p) {
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/* Case 2: we have a cache entry, but it starts after p, so we
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need another one for the missing bit.
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*/
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CacheEntry* c = new CacheEntry (this, p, min (end, (*cache)->start()));
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cache = _cache.insert (cache, c);
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++cache;
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render = c;
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} else {
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/* Case 3: we have a cache entry that will do at least some of what
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we have left, so render it.
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*/
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render = *cache;
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++cache;
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}
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int const this_end = min (end, render->end ());
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Coord const left = p - _region_start / _samples_per_pixel;
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Coord const right = this_end - _region_start / _samples_per_pixel;
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context->save ();
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context->rectangle (left, area.y0, right, area.height());
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context->clip ();
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context->translate (left, 0);
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context->set_source (render->image(), render->start() - p, 0);
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context->paint ();
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context->restore ();
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p = min (end, render->end ());
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}
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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, _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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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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void
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WaveView::set_channel (int channel)
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{
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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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void
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WaveView::invalidate_whole_cache ()
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{
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begin_visual_change ();
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for (list<CacheEntry*>::iterator i = _cache.begin(); i != _cache.end(); ++i) {
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delete *i;
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}
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_cache.clear ();
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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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begin_visual_change ();
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for (list<CacheEntry*>::iterator i = _cache.begin(); i != _cache.end(); ++i) {
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(*i)->clear_image ();
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}
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end_visual_change ();
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}
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void
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WaveView::region_resized ()
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{
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_bounding_box_dirty = true;
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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::set_region_start (frameoffset_t start)
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{
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_region_start = start;
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_bounding_box_dirty = true;
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}
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/** Construct a new CacheEntry with peak data between two offsets
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* in the source.
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*/
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WaveView::CacheEntry::CacheEntry (WaveView const * wave_view, int start, int end)
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: _wave_view (wave_view)
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, _start (start)
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, _end (end)
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{
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_n_peaks = _end - _start;
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_peaks.reset (new PeakData[_n_peaks]);
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_wave_view->_region->read_peaks (
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_peaks.get(),
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_n_peaks,
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_start * _wave_view->_samples_per_pixel,
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(_end - _start) * _wave_view->_samples_per_pixel,
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_wave_view->_channel,
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_wave_view->_samples_per_pixel
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);
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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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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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/* 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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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 = 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 */
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context->line_to (-10.0, position (0.0));
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}
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context->close_path ();
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if (_wave_view->gradient_depth() != 0.0) {
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Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _wave_view->_height));
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double stops[3];
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double r, g, b, a;
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if (_wave_view->_shape == Rectified) {
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stops[0] = 0.1;
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stops[0] = 0.3;
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stops[0] = 0.9;
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} else {
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stops[0] = 0.1;
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stops[1] = 0.5;
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stops[2] = 0.9;
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}
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color_to_rgba (_wave_view->_fill_color, r, g, b, a);
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gradient->add_color_stop_rgba (stops[0], r, g, b, a);
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gradient->add_color_stop_rgba (stops[2], r, g, b, a);
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/* generate a new color for the middle of the gradient */
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double h, s, v;
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color_to_hsv (_wave_view->_fill_color, h, s, v);
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/* tone down the saturation */
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s *= 1.0 - _wave_view->gradient_depth();
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Color center = hsv_to_color (h, s, v, a);
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color_to_rgba (center, r, g, b, a);
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gradient->add_color_stop_rgba (stops[1], r, g, b, a);
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context->set_source (gradient);
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} else {
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set_source_rgba (context, _wave_view->_fill_color);
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}
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context->fill_preserve ();
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_wave_view->setup_outline_context (context);
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context->stroke ();
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if (_wave_view->show_zero_line()) {
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set_source_rgba (context, _wave_view->_zero_color);
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context->move_to (0, position (0.0));
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context->line_to (_n_peaks, position (0.0));
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context->stroke ();
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}
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}
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return _image;
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}
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Coord
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WaveView::CacheEntry::position (double s) const
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{
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switch (_wave_view->_shape) {
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case Rectified:
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return _wave_view->_height - (s * _wave_view->_height);
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default:
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break;
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}
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return (1.0-s) * (_wave_view->_height / 2.0);
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}
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void
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WaveView::CacheEntry::clear_image ()
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{
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_image.clear ();
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}
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void
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WaveView::set_global_gradient_depth (double depth)
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{
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if (_global_gradient_depth != depth) {
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_global_gradient_depth = depth;
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VisualPropertiesChanged (); /* EMIT SIGNAL */
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}
|
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}
|