2 Copyright (C) 2011-2013 Paul Davis
3 Author: Carl Hetherington <cth@carlh.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <cairomm/cairomm.h>
24 #include "gtkmm2ext/utils.h"
26 #include "pbd/compose.h"
27 #include "pbd/signals.h"
28 #include "pbd/stacktrace.h"
30 #include "ardour/types.h"
31 #include "ardour/dB.h"
32 #include "ardour/audioregion.h"
34 #include "canvas/wave_view.h"
35 #include "canvas/utils.h"
36 #include "canvas/canvas.h"
38 #include <gdkmm/general.h>
41 using namespace ARDOUR;
42 using namespace ArdourCanvas;
44 double WaveView::_global_gradient_depth = 0.6;
45 bool WaveView::_global_logscaled = false;
46 WaveView::Shape WaveView::_global_shape = WaveView::Normal;
47 bool WaveView::_global_show_waveform_clipping = true;
48 double WaveView::_clip_level = 0.98853;
50 PBD::Signal0<void> WaveView::VisualPropertiesChanged;
51 PBD::Signal0<void> WaveView::ClipLevelChanged;
53 WaveView::WaveView (Group* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
59 , _samples_per_pixel (0)
62 , _zero_color (0xff0000ff)
63 , _clip_color (0xff0000ff)
64 , _logscaled (_global_logscaled)
65 , _shape (_global_shape)
66 , _gradient_depth (_global_gradient_depth)
67 , _shape_independent (false)
68 , _logscaled_independent (false)
69 , _gradient_depth_independent (false)
70 , _amplitude_above_axis (1.0)
71 , _region_start (region->start())
75 VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
76 ClipLevelChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_clip_level_change, this));
79 WaveView::~WaveView ()
84 WaveView::handle_visual_property_change ()
88 if (!_shape_independent && (_shape != global_shape())) {
89 _shape = global_shape();
93 if (!_logscaled_independent && (_logscaled != global_logscaled())) {
94 _logscaled = global_logscaled();
98 if (!_gradient_depth_independent && (_gradient_depth != global_gradient_depth())) {
99 _gradient_depth = global_gradient_depth();
109 WaveView::handle_clip_level_change ()
115 WaveView::set_fill_color (Color c)
117 if (c != _fill_color) {
119 Fill::set_fill_color (c);
124 WaveView::set_outline_color (Color c)
126 if (c != _outline_color) {
128 Outline::set_outline_color (c);
133 WaveView::set_samples_per_pixel (double samples_per_pixel)
135 if (samples_per_pixel != _samples_per_pixel) {
138 _samples_per_pixel = samples_per_pixel;
140 _bounding_box_dirty = true;
149 image_to_window (double wave_origin, double image_start)
151 return wave_origin + image_start;
155 window_to_image (double wave_origin, double image_start)
157 return image_start - wave_origin;
161 _log_meter (float power, double lower_db, double upper_db, double non_linearity)
163 return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity));
167 alt_log_meter (float power)
169 return _log_meter (power, -192.0, 0.0, 8.0);
173 WaveView::set_clip_level (double dB)
175 const double clip_level = dB_to_coefficient (dB);
176 if (clip_level != _clip_level) {
177 _clip_level = clip_level;
188 LineTips() : top (0.0), bot (0.0), clip_max (false), clip_min (false) {}
192 WaveView::draw_image (PeakData* _peaks, int n_peaks) const
194 _image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, _height);
196 Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (_image);
198 boost::scoped_array<LineTips> tips (new LineTips[n_peaks]);
200 /* Clip level nominally set to -0.9dBFS to account for inter-sample
201 interpolation possibly clipping (value may be too low).
203 We adjust by the region's own gain (but note: not by any gain
204 automation or its gain envelope) so that clip indicators are closer
205 to providing data about on-disk data. This multiplication is
206 needed because the data we get from AudioRegion::read_peaks()
207 has been scaled by scale_amplitude() already.
210 const double clip_level = _clip_level * _region->scale_amplitude();
212 if (_shape == WaveView::Rectified) {
214 /* each peak is a line from the bottom of the waveview
215 * to a point determined by max (_peaks[i].max,
220 for (int i = 0; i < n_peaks; ++i) {
221 tips[i].bot = height();
222 tips[i].top = position (alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min)))));
224 if (fabs (_peaks[i].max) >= clip_level) {
225 tips[i].clip_max = true;
228 if (fabs (_peaks[i].min) >= clip_level) {
229 tips[i].clip_min = true;
232 } else {for (int i = 0; i < n_peaks; ++i) {
233 tips[i].bot = height();
234 tips[i].top = position (max (fabs (_peaks[i].max), fabs (_peaks[i].min)));
236 if (fabs (_peaks[i].max) >= clip_level) {
237 tips[i].clip_max = true;
240 if (fabs (_peaks[i].min) >= clip_level) {
241 tips[i].clip_min = true;
249 for (int i = 0; i < n_peaks; ++i) {
250 Coord top = _peaks[i].min;
251 Coord bot = _peaks[i].max;
253 if (fabs (top) >= clip_level) {
254 tips[i].clip_max = true;
257 if (fabs (bot) >= clip_level) {
258 tips[i].clip_min = true;
262 top = position (alt_log_meter (fast_coefficient_to_dB (top)));
263 } else if (top < 0.0) {
264 top = position (-alt_log_meter (fast_coefficient_to_dB (-top)));
266 top = position (0.0);
270 bot = position (alt_log_meter (fast_coefficient_to_dB (bot)));
271 } else if (bot < 0.0) {
272 bot = position (-alt_log_meter (fast_coefficient_to_dB (-bot)));
274 bot = position (0.0);
282 for (int i = 0; i < n_peaks; ++i) {
284 if (fabs (_peaks[i].max) >= clip_level) {
285 tips[i].clip_max = true;
288 if (fabs (_peaks[i].min) >= clip_level) {
289 tips[i].clip_min = true;
292 tips[i].top = position (_peaks[i].min);
293 tips[i].bot = position (_peaks[i].max);
300 if (gradient_depth() != 0.0) {
302 Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _height));
308 if (_shape == Rectified) {
318 color_to_rgba (_fill_color, r, g, b, a);
319 gradient->add_color_stop_rgba (stops[0], r, g, b, a);
320 gradient->add_color_stop_rgba (stops[2], r, g, b, a);
322 /* generate a new color for the middle of the gradient */
324 color_to_hsv (_fill_color, h, s, v);
325 /* change v towards white */
326 v *= 1.0 - gradient_depth();
327 Color center = hsv_to_color (h, s, v, a);
328 color_to_rgba (center, r, g, b, a);
329 gradient->add_color_stop_rgba (stops[1], r, g, b, a);
331 context->set_source (gradient);
333 set_source_rgba (context, _fill_color);
336 /* ensure single-pixel lines */
338 context->set_line_width (0.5);
339 context->translate (0.5, 0.0);
343 if (_shape == WaveView::Rectified) {
344 for (int i = 0; i < n_peaks; ++i) {
345 context->move_to (i, tips[i].top); /* down 1 pixel */
346 context->line_to (i, tips[i].bot);
350 for (int i = 0; i < n_peaks; ++i) {
351 context->move_to (i, tips[i].top);
352 context->line_to (i, tips[i].bot);
357 /* now add dots to the top and bottom of each line (this is
358 * modelled on pyramix, except that we add clipping indicators.
361 if (_global_show_waveform_clipping) {
363 set_source_rgba (context, _outline_color);
365 /* the height of the clip-indicator should be at most 7 pixels,
366 or 5% of the height of the waveview item.
368 const double clip_height = min (7.0, ceil (_height * 0.05));
370 for (int i = 0; i < n_peaks; ++i) {
371 context->move_to (i, tips[i].top);
373 bool show_top_clip = (_shape == WaveView::Rectified && (tips[i].clip_max || tips[i].clip_min)) ||
377 set_source_rgba (context, _clip_color);
378 context->rel_line_to (0, clip_height);
380 set_source_rgba (context, _outline_color);
382 context->rel_line_to (0, 1.0);
386 if (_shape != WaveView::Rectified) {
387 context->move_to (i, tips[i].bot);
388 if (tips[i].clip_min) {
389 set_source_rgba (context, _clip_color);
390 context->rel_line_to (0, -clip_height);
392 set_source_rgba (context, _outline_color);
394 context->rel_line_to (0, -1.0);
401 if (show_zero_line()) {
403 set_source_rgba (context, _zero_color);
404 context->set_line_width (1.0);
405 context->move_to (0, position (0.0) + 0.5);
406 context->line_to (n_peaks, position (0.0) + 0.5);
412 WaveView::ensure_cache (framepos_t start, framepos_t end) const
414 if (_image && _sample_start <= start && _sample_end >= end) {
415 /* cache already covers required range, do nothing */
419 /* sample position is canonical here, and we want to generate
420 * an image that spans about twice the canvas width
423 const framepos_t center = start + ((end - start) / 2);
424 const framecnt_t canvas_samples = 2 * (_canvas->visible_area().width() * _samples_per_pixel);
426 /* we can request data from anywhere in the Source, between 0 and its length
429 _sample_start = max ((framepos_t) 0, (center - canvas_samples));
430 _sample_end = min (center + canvas_samples, _region->source_length (0));
432 const int n_peaks = llrintf ((_sample_end - _sample_start)/ (double) _samples_per_pixel);
434 boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
436 _region->read_peaks (peaks.get(), n_peaks,
437 _sample_start, _sample_end - _sample_start,
441 draw_image (peaks.get(), n_peaks);
445 WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
447 assert (_samples_per_pixel != 0);
453 Rect self = item_to_window (Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height));
454 boost::optional<Rect> d = self.intersection (area);
462 /* window coordinates - pixels where x=0 is the left edge of the canvas
463 * window. We round down in case we were asked to
464 * draw "between" pixels at the start and/or end.
467 const double draw_start = floor (draw.x0);
468 const double draw_end = floor (draw.x1);
470 // cerr << "Need to draw " << draw_start << " .. " << draw_end << endl;
472 /* image coordnates: pixels where x=0 is the start of this waveview,
473 * wherever it may be positioned. thus image_start=N means "an image
474 * that beings N pixels after the start of region that this waveview is
478 const framepos_t image_start = window_to_image (self.x0, draw_start);
479 const framepos_t image_end = window_to_image (self.x0, draw_end);
481 // cerr << "Image/WV space: " << image_start << " .. " << image_end << endl;
483 /* sample coordinates - note, these are not subject to rounding error */
484 framepos_t sample_start = _region_start + (image_start * _samples_per_pixel);
485 framepos_t sample_end = _region_start + (image_end * _samples_per_pixel);
487 // cerr << "Sample space: " << sample_start << " .. " << sample_end << endl;
489 ensure_cache (sample_start, sample_end);
491 // cerr << "Cache contains " << _cache->pixel_start() << " .. " << _cache->pixel_end() << " / "
492 // << _cache->sample_start() << " .. " << _cache->sample_end()
495 double image_offset = (_sample_start - _region->start()) / _samples_per_pixel;
497 // cerr << "Offset into image to place at zero: " << image_offset << endl;
499 context->rectangle (draw_start, draw.y0, draw_end - draw_start, draw.height());
501 /* round image origin position to an exact pixel in device space to
505 double x = self.x0 + image_offset;
507 context->user_to_device (x, y);
510 context->device_to_user (x, y);
512 context->set_source (_image, x, y);
517 WaveView::compute_bounding_box () const
520 _bounding_box = Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height);
522 _bounding_box = boost::optional<Rect> ();
525 _bounding_box_dirty = false;
529 WaveView::set_height (Distance height)
531 if (height != _height) {
536 _bounding_box_dirty = true;
544 WaveView::set_channel (int channel)
546 if (channel != _channel) {
551 _bounding_box_dirty = true;
559 WaveView::invalidate_image ()
561 begin_visual_change ();
567 end_visual_change ();
572 WaveView::set_logscaled (bool yn)
574 if (_logscaled != yn) {
581 WaveView::gain_changed ()
587 WaveView::set_zero_color (Color c)
589 if (_zero_color != c) {
596 WaveView::set_clip_color (Color c)
598 if (_clip_color != c) {
605 WaveView::set_show_zero_line (bool yn)
607 if (_show_zero != yn) {
614 WaveView::set_shape (Shape s)
623 WaveView::set_amplitude_above_axis (double a)
625 if (_amplitude_above_axis != a) {
626 _amplitude_above_axis = a;
632 WaveView::set_global_shape (Shape s)
634 if (_global_shape != s) {
636 VisualPropertiesChanged (); /* EMIT SIGNAL */
641 WaveView::set_global_logscaled (bool yn)
643 if (_global_logscaled != yn) {
644 _global_logscaled = yn;
645 VisualPropertiesChanged (); /* EMIT SIGNAL */
650 WaveView::region_resized ()
656 /* special: do not use _region->length() here to compute
657 bounding box because it will already have changed.
659 if we have a bounding box, use it.
662 _pre_change_bounding_box = _bounding_box;
664 _bounding_box_dirty = true;
665 compute_bounding_box ();
671 WaveView::position (double s) const
673 /* it is important that this returns an integral value, so that we
674 can ensure correct single pixel behaviour.
681 pos = floor (_height - (s * _height));
684 pos = floor ((1.0-s) * (_height / 2.0));
688 return min (_height, (max (0.0, pos)));
692 WaveView::set_global_gradient_depth (double depth)
694 if (_global_gradient_depth != depth) {
695 _global_gradient_depth = depth;
696 VisualPropertiesChanged (); /* EMIT SIGNAL */
701 WaveView::set_global_show_waveform_clipping (bool yn)
703 if (_global_show_waveform_clipping != yn) {
704 _global_show_waveform_clipping = yn;
705 VisualPropertiesChanged (); /* EMIT SIGNAL */