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"
37 #include "canvas/colors.h"
39 #include <gdkmm/general.h>
42 using namespace ARDOUR;
43 using namespace ArdourCanvas;
45 #define CACHE_HIGH_WATER (2)
47 std::map <boost::shared_ptr<AudioSource>, std::vector<WaveView::CacheEntry> > WaveView::_image_cache;
48 double WaveView::_global_gradient_depth = 0.6;
49 bool WaveView::_global_logscaled = false;
50 WaveView::Shape WaveView::_global_shape = WaveView::Normal;
51 bool WaveView::_global_show_waveform_clipping = true;
52 double WaveView::_clip_level = 0.98853;
54 PBD::Signal0<void> WaveView::VisualPropertiesChanged;
55 PBD::Signal0<void> WaveView::ClipLevelChanged;
57 WaveView::WaveView (Canvas* c, boost::shared_ptr<ARDOUR::AudioRegion> region)
61 , _samples_per_pixel (0)
64 , _zero_color (0xff0000ff)
65 , _clip_color (0xff0000ff)
66 , _logscaled (_global_logscaled)
67 , _shape (_global_shape)
68 , _gradient_depth (_global_gradient_depth)
69 , _shape_independent (false)
70 , _logscaled_independent (false)
71 , _gradient_depth_independent (false)
72 , _amplitude_above_axis (1.0)
73 , _region_amplitude (_region->scale_amplitude ())
74 , _region_start (region->start())
76 VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
77 ClipLevelChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_clip_level_change, this));
80 WaveView::WaveView (Item* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
84 , _samples_per_pixel (0)
87 , _zero_color (0xff0000ff)
88 , _clip_color (0xff0000ff)
89 , _logscaled (_global_logscaled)
90 , _shape (_global_shape)
91 , _gradient_depth (_global_gradient_depth)
92 , _shape_independent (false)
93 , _logscaled_independent (false)
94 , _gradient_depth_independent (false)
95 , _amplitude_above_axis (1.0)
96 , _region_amplitude (_region->scale_amplitude ())
97 , _region_start (region->start())
99 VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
100 ClipLevelChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_clip_level_change, this));
103 WaveView::~WaveView ()
105 invalidate_image_cache ();
109 WaveView::handle_visual_property_change ()
111 bool changed = false;
113 if (!_shape_independent && (_shape != global_shape())) {
114 _shape = global_shape();
118 if (!_logscaled_independent && (_logscaled != global_logscaled())) {
119 _logscaled = global_logscaled();
123 if (!_gradient_depth_independent && (_gradient_depth != global_gradient_depth())) {
124 _gradient_depth = global_gradient_depth();
129 begin_visual_change ();
130 invalidate_image_cache ();
131 end_visual_change ();
136 WaveView::handle_clip_level_change ()
138 begin_visual_change ();
139 invalidate_image_cache ();
140 end_visual_change ();
144 WaveView::set_fill_color (Color c)
146 if (c != _fill_color) {
147 begin_visual_change ();
148 invalidate_image_cache ();
149 Fill::set_fill_color (c);
150 end_visual_change ();
155 WaveView::set_outline_color (Color c)
157 if (c != _outline_color) {
158 begin_visual_change ();
159 invalidate_image_cache ();
160 Outline::set_outline_color (c);
161 end_visual_change ();
166 WaveView::set_samples_per_pixel (double samples_per_pixel)
168 if (samples_per_pixel != _samples_per_pixel) {
171 invalidate_image_cache ();
172 _samples_per_pixel = samples_per_pixel;
173 _bounding_box_dirty = true;
180 window_to_image (double wave_origin, double image_start)
182 return image_start - wave_origin;
186 _log_meter (float power, double lower_db, double upper_db, double non_linearity)
188 return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity));
192 alt_log_meter (float power)
194 return _log_meter (power, -192.0, 0.0, 8.0);
198 WaveView::set_clip_level (double dB)
200 const double clip_level = dB_to_coefficient (dB);
201 if (clip_level != _clip_level) {
202 _clip_level = clip_level;
208 WaveView::invalidate_image_cache ()
210 vector <uint32_t> deletion_list;
211 vector <CacheEntry> caches;
213 if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
214 caches = _image_cache.find (_region->audio_source ())->second;
219 for (uint32_t i = 0; i < caches.size (); ++i) {
221 if (_channel != caches[i].channel
222 || _height != caches[i].height
223 || _region_amplitude != caches[i].amplitude
224 || _fill_color != caches[i].fill_color) {
229 deletion_list.push_back (i);
233 while (deletion_list.size() > 0) {
234 caches[deletion_list.back ()].image.clear ();
235 caches.erase (caches.begin() + deletion_list.back());
236 deletion_list.pop_back();
239 if (caches.size () == 0) {
240 _image_cache.erase(_region->audio_source ());
242 _image_cache[_region->audio_source ()] = caches;
248 WaveView::consolidate_image_cache () const
250 list <uint32_t> deletion_list;
251 vector <CacheEntry> caches;
252 uint32_t other_entries = 0;
254 if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
255 caches = _image_cache.find (_region->audio_source ())->second;
258 for (uint32_t i = 0; i < caches.size (); ++i) {
260 if (_channel != caches[i].channel
261 || _height != caches[i].height
262 || _region_amplitude != caches[i].amplitude
263 || _fill_color != caches[i].fill_color) {
269 framepos_t segment_start = caches[i].start;
270 framepos_t segment_end = caches[i].end;
272 for (uint32_t j = i; j < caches.size (); ++j) {
274 if (i == j || _channel != caches[j].channel
275 || _height != caches[i].height
276 || _region_amplitude != caches[i].amplitude
277 || _fill_color != caches[i].fill_color) {
282 if (caches[j].start >= segment_start && caches[j].end <= segment_end) {
284 deletion_list.push_back (j);
289 deletion_list.sort ();
290 deletion_list.unique ();
292 while (deletion_list.size() > 0) {
293 caches[deletion_list.back ()].image.clear ();
294 caches.erase (caches.begin() + deletion_list.back ());
295 deletion_list.pop_back();
298 /* We don't care if this channel/height/amplitude has anything in the cache - just drop the Last Added entries
299 until we reach a size where there is a maximum of CACHE_HIGH_WATER + other entries.
302 while (caches.size() > CACHE_HIGH_WATER + other_entries) {
303 caches.front ().image.clear ();
304 caches.erase(caches.begin ());
307 if (caches.size () == 0) {
308 _image_cache.erase (_region->audio_source ());
310 _image_cache[_region->audio_source ()] = caches;
315 WaveView::y_extent (double s, bool /*round_to_lower_edge*/) const
317 /* it is important that this returns an integral value, so that we
318 * can ensure correct single pixel behaviour.
320 * we need (_height - max(wave_line_width))
321 * wave_line_width == 1 IFF top==bottom (1 sample per pixel or flat line)
322 * wave_line_width == 2 otherwise
323 * then round away from the zero line, towards peak
325 if (_shape == Rectified) {
326 // we only ever have 1 point and align to the bottom (not center)
327 return floor ((1.0 - s) * (_height - 2.0));
329 /* currently canvas rectangle is off-by-one and we
330 * cannot draw a pixel at 0 (-.5 .. +.5) without it being
331 * clipped. A value 1.0 (ideally one point at y=0) ends
332 * up a pixel down. and a value of -1.0 (ideally y = _height-1)
333 * currently is on the bottom separator line :(
334 * So to make the complete waveform appear centered in
335 * a region, we translate by +.5 (instead of -.5)
336 * and waste two pixel of height: -4 (instad of -2)
338 * This needs fixing in canvas/rectangle the intersect
339 * functions and probably a couple of other places as well...
343 pos = ceil ((1.0 - s) * .5 * (_height - 4.0));
345 pos = floor ((1.0 - s) * .5 * (_height - 4.0));
347 return min (_height - 4.0, (max (0.0, pos)));
358 LineTips() : top (0.0), bot (0.0), clip_max (false), clip_min (false) {}
362 Cairo::RefPtr<Cairo::ImageSurface> wave;
363 Cairo::RefPtr<Cairo::ImageSurface> outline;
364 Cairo::RefPtr<Cairo::ImageSurface> clip;
365 Cairo::RefPtr<Cairo::ImageSurface> zero;
368 wave (0), outline (0), clip (0), zero (0) {}
372 WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peaks, int n_peaks) const
377 images.wave = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
378 images.outline = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
379 images.clip = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
380 images.zero = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
382 Cairo::RefPtr<Cairo::Context> wave_context = Cairo::Context::create (images.wave);
383 Cairo::RefPtr<Cairo::Context> outline_context = Cairo::Context::create (images.outline);
384 Cairo::RefPtr<Cairo::Context> clip_context = Cairo::Context::create (images.clip);
385 Cairo::RefPtr<Cairo::Context> zero_context = Cairo::Context::create (images.zero);
387 boost::scoped_array<LineTips> tips (new LineTips[n_peaks]);
389 /* Clip level nominally set to -0.9dBFS to account for inter-sample
390 interpolation possibly clipping (value may be too low).
392 We adjust by the region's own gain (but note: not by any gain
393 automation or its gain envelope) so that clip indicators are closer
394 to providing data about on-disk data. This multiplication is
395 needed because the data we get from AudioRegion::read_peaks()
396 has been scaled by scale_amplitude() already.
399 const double clip_level = _clip_level * _region_amplitude;
401 if (_shape == WaveView::Rectified) {
403 /* each peak is a line from the bottom of the waveview
404 * to a point determined by max (_peaks[i].max,
409 for (int i = 0; i < n_peaks; ++i) {
411 tips[i].bot = height() - 1.0;
412 const double p = alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min))));
413 tips[i].top = y_extent (p, false);
414 tips[i].spread = p * (_height - 1.0);
416 if (fabs (_peaks[i].max) >= clip_level) {
417 tips[i].clip_max = true;
420 if (fabs (_peaks[i].min) >= clip_level) {
421 tips[i].clip_max = true;
425 } else {for (int i = 0; i < n_peaks; ++i) {
427 tips[i].bot = height() - 1.0;
428 const double p = max(fabs (_peaks[i].max), fabs (_peaks[i].min));
429 tips[i].top = y_extent (p, false);
430 tips[i].spread = p * (_height - 2.0);
431 if (p >= clip_level) {
432 tips[i].clip_max = true;
441 for (int i = 0; i < n_peaks; ++i) {
442 double top = _peaks[i].max;
443 double bot = _peaks[i].min;
445 if (_peaks[i].max > 0 && _peaks[i].min > 0) {
446 if (fabs (_peaks[i].max) >= clip_level) {
447 tips[i].clip_max = true;
450 else if (_peaks[i].max < 0 && _peaks[i].min < 0) {
451 if (fabs (_peaks[i].min) >= clip_level) {
452 tips[i].clip_min = true;
455 if (fabs (_peaks[i].max) >= clip_level) {
456 tips[i].clip_max = true;
458 if (fabs (_peaks[i].min) >= clip_level) {
459 tips[i].clip_min = true;
464 top = alt_log_meter (fast_coefficient_to_dB (top));
465 } else if (top < 0.0) {
466 top =-alt_log_meter (fast_coefficient_to_dB (-top));
472 bot = alt_log_meter (fast_coefficient_to_dB (bot));
473 } else if (bot < 0.0) {
474 bot = -alt_log_meter (fast_coefficient_to_dB (-bot));
479 tips[i].top = y_extent (top, false);
480 tips[i].bot = y_extent (bot, true);
481 tips[i].spread = fabs (tips[i].top - tips[i].bot);
485 for (int i = 0; i < n_peaks; ++i) {
486 if (_peaks[i].max > 0 && _peaks[i].min > 0) {
487 if (fabs (_peaks[i].max) >= clip_level) {
488 tips[i].clip_max = true;
491 else if (_peaks[i].max < 0 && _peaks[i].min < 0) {
492 if (fabs (_peaks[i].min) >= clip_level) {
493 tips[i].clip_min = true;
496 if (fabs (_peaks[i].max) >= clip_level) {
497 tips[i].clip_max = true;
499 if (fabs (_peaks[i].min) >= clip_level) {
500 tips[i].clip_min = true;
504 tips[i].top = y_extent (_peaks[i].max, false);
505 tips[i].bot = y_extent (_peaks[i].min, true);
506 tips[i].spread = fabs (tips[i].top - tips[i].bot);
511 Color alpha_one = rgba_to_color (0, 0, 0, 1.0);
513 set_source_rgba (wave_context, alpha_one);
514 set_source_rgba (outline_context, alpha_one);
515 set_source_rgba (clip_context, alpha_one);
516 set_source_rgba (zero_context, alpha_one);
518 /* ensure single-pixel lines */
520 wave_context->set_line_width (1.0);
521 wave_context->translate (0.5, +0.5);
523 outline_context->set_line_cap (Cairo::LINE_CAP_ROUND);
524 outline_context->set_line_width (1.0);
525 outline_context->translate (0.5, +0.5);
527 clip_context->set_line_width (1.0);
528 clip_context->translate (0.5, +0.5);
530 zero_context->set_line_width (1.0);
531 zero_context->translate (0.5, +0.5);
533 /* the height of the clip-indicator should be at most 7 pixels,
534 * or 5% of the height of the waveview item.
537 const double clip_height = min (7.0, ceil (_height * 0.05));
539 /* There are 3 possible components to draw at each x-axis position: the
540 waveform "line", the zero line and an outline/clip indicator. We
541 have to decide which of the 3 to draw at each position, pixel by
542 pixel. This makes the rendering less efficient but it is the only
543 way I can see to do this correctly.
545 To avoid constant source swapping and stroking, we draw the components separately
546 onto four alpha only image surfaces for use as a mask.
548 With only 1 pixel of spread between the top and bottom of the line,
549 we just draw the upper outline/clip indicator.
551 With 2 pixels of spread, we draw the upper and lower outline clip
554 With 3 pixels of spread we draw the upper and lower outline/clip
555 indicators and at least 1 pixel of the waveform line.
557 With 5 pixels of spread, we draw all components.
559 We can do rectified as two separate passes because we have a much
560 easier decision regarding whether to draw the waveform line. We
561 always draw the clip/outline indicators.
564 if (_shape == WaveView::Rectified) {
566 for (int i = 0; i < n_peaks; ++i) {
570 if (tips[i].spread >= 1.0) {
571 wave_context->move_to (i, tips[i].top);
572 wave_context->line_to (i, tips[i].bot);
575 if (_global_show_waveform_clipping && (tips[i].clip_max)) {
576 clip_context->move_to (i, tips[i].top);
577 /* clip-indicating upper terminal line */
578 clip_context->rel_line_to (0, min (clip_height, ceil(tips[i].spread + .5)));
580 outline_context->move_to (i, tips[i].top);
581 /* normal upper terminal dot */
582 outline_context->close_path ();
586 wave_context->stroke ();
587 clip_context->stroke ();
588 outline_context->stroke ();
591 const double height_2 = (_height - 4.0) * .5;
593 for (int i = 0; i < n_peaks; ++i) {
597 if (tips[i].spread >= 2.0) {
598 wave_context->move_to (i, tips[i].top);
599 wave_context->line_to (i, tips[i].bot);
602 if (tips[i-1].top + 2 < tips[i].bot) {
603 wave_context->move_to (i-1, tips[i-1].top);
604 wave_context->line_to (i, tips[i].bot);
606 else if (tips[i-1].bot > tips[i].top + 2) {
607 wave_context->move_to (i-1, tips[i-1].bot);
608 wave_context->line_to (i, tips[i].top);
614 if (tips[i].spread >= 5.0 && show_zero_line()) {
615 zero_context->move_to (i, floor(height_2));
616 zero_context->rel_line_to (1.0, 0);
619 if (tips[i].spread > 1.0) {
620 /* lower outline/clip indicator */
621 if (_global_show_waveform_clipping && tips[i].clip_min) {
622 clip_context->move_to (i, tips[i].bot);
623 /* clip-indicating lower terminal line */
624 const double sign = tips[i].bot > height_2 ? -1 : 1;
625 clip_context->rel_line_to (0, sign * min (clip_height, ceil (tips[i].spread + .5)));
627 outline_context->move_to (i, tips[i].bot);
628 /* normal lower terminal dot */
629 outline_context->close_path ();
632 if (tips[i].clip_min) {
633 // make sure we draw the clip
634 tips[i].clip_max = true;
638 /* upper outline/clip indicator */
639 if (_global_show_waveform_clipping && tips[i].clip_max) {
640 clip_context->move_to (i, tips[i].top);
641 /* clip-indicating upper terminal line */
642 const double sign = tips[i].top > height_2 ? -1 : 1;
643 clip_context->rel_line_to (0, sign * min(clip_height, ceil(tips[i].spread + .5)));
645 outline_context->move_to (i, tips[i].top);
646 /* normal upper terminal dot */
647 outline_context->close_path ();
651 wave_context->stroke ();
652 outline_context->stroke ();
653 clip_context->stroke ();
654 zero_context->stroke ();
657 Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
659 /* Here we set a source colour and use the various components as a mask. */
661 if (gradient_depth() != 0.0) {
663 Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _height));
669 if (_shape == Rectified) {
679 color_to_rgba (_fill_color, r, g, b, a);
680 gradient->add_color_stop_rgba (stops[1], r, g, b, a);
681 /* generate a new color for the middle of the gradient */
683 color_to_hsv (_fill_color, h, s, v);
684 /* change v towards white */
685 v *= 1.0 - gradient_depth();
686 Color center = hsv_to_color (h, s, v, a);
687 color_to_rgba (center, r, g, b, a);
689 gradient->add_color_stop_rgba (stops[0], r, g, b, a);
690 gradient->add_color_stop_rgba (stops[2], r, g, b, a);
692 context->set_source (gradient);
694 set_source_rgba (context, _fill_color);
697 context->mask (images.wave, 0, 0);
700 set_source_rgba (context, _outline_color);
701 context->mask (images.outline, 0, 0);
704 set_source_rgba (context, _clip_color);
705 context->mask (images.clip, 0, 0);
708 set_source_rgba (context, _zero_color);
709 context->mask (images.zero, 0, 0);
715 WaveView::get_image (Cairo::RefPtr<Cairo::ImageSurface>& image, framepos_t start, framepos_t end, double& image_offset) const
717 vector <CacheEntry> caches;
719 if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
721 caches = _image_cache.find (_region->audio_source ())->second;
724 /* Find a suitable ImageSurface.
726 for (uint32_t i = 0; i < caches.size (); ++i) {
728 if (_channel != caches[i].channel
729 || _height != caches[i].height
730 || _region_amplitude != caches[i].amplitude
731 || _fill_color != caches[i].fill_color) {
736 framepos_t segment_start = caches[i].start;
737 framepos_t segment_end = caches[i].end;
739 if (end <= segment_end && start >= segment_start) {
740 image_offset = (segment_start - _region_start) / _samples_per_pixel;
741 image = caches[i].image;
747 consolidate_image_cache ();
749 /* sample position is canonical here, and we want to generate
750 * an image that spans about twice the canvas width
753 const framepos_t center = start + ((end - start) / 2);
754 const framecnt_t canvas_samples = _canvas->visible_area().width() * _samples_per_pixel; /* one canvas width */
756 /* we can request data from anywhere in the Source, between 0 and its length
759 framepos_t sample_start = max ((framepos_t) 0, (center - canvas_samples));
760 framepos_t sample_end = min (center + canvas_samples, _region->source_length (0));
762 const int n_peaks = llrintf ((sample_end - sample_start)/ (double) _samples_per_pixel);
764 boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
766 _region->read_peaks (peaks.get(), n_peaks,
767 sample_start, sample_end - sample_start,
771 image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, _height);
773 draw_image (image, peaks.get(), n_peaks);
775 _image_cache[_region->audio_source ()].push_back (CacheEntry (_channel, _height, _region_amplitude, _fill_color, sample_start, sample_end, image));
777 image_offset = (sample_start - _region->start()) / _samples_per_pixel;
779 //cerr << "_image_cache size is : " << _image_cache.size() << " entries for this audiosource : " << _image_cache.find (_region->audio_source ())->second.size() << endl;
785 WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
787 assert (_samples_per_pixel != 0);
793 Rect self = item_to_window (Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height));
794 boost::optional<Rect> d = self.intersection (area);
802 /* window coordinates - pixels where x=0 is the left edge of the canvas
803 * window. We round down in case we were asked to
804 * draw "between" pixels at the start and/or end.
807 const double draw_start = floor (draw.x0);
808 const double draw_end = floor (draw.x1);
810 // cerr << "Need to draw " << draw_start << " .. " << draw_end << endl;
812 /* image coordnates: pixels where x=0 is the start of this waveview,
813 * wherever it may be positioned. thus image_start=N means "an image
814 * that beings N pixels after the start of region that this waveview is
818 const framepos_t image_start = window_to_image (self.x0, draw_start);
819 const framepos_t image_end = window_to_image (self.x0, draw_end);
821 // cerr << "Image/WV space: " << image_start << " .. " << image_end << endl;
823 /* sample coordinates - note, these are not subject to rounding error */
824 framepos_t sample_start = _region_start + (image_start * _samples_per_pixel);
825 framepos_t sample_end = _region_start + (image_end * _samples_per_pixel);
827 // cerr << "Sample space: " << sample_start << " .. " << sample_end << endl;
829 Cairo::RefPtr<Cairo::ImageSurface> image;
830 double image_offset = 0;
832 get_image (image, sample_start, sample_end, image_offset);
834 // cerr << "Offset into image to place at zero: " << image_offset << endl;
836 context->rectangle (draw_start, draw.y0, draw_end - draw_start, draw.height());
838 /* round image origin position to an exact pixel in device space to
842 double x = self.x0 + image_offset;
844 context->user_to_device (x, y);
847 context->device_to_user (x, y);
849 context->set_source (image, x, y);
855 WaveView::compute_bounding_box () const
858 _bounding_box = Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height);
860 _bounding_box = boost::optional<Rect> ();
863 _bounding_box_dirty = false;
867 WaveView::set_height (Distance height)
869 if (height != _height) {
872 invalidate_image_cache ();
875 _bounding_box_dirty = true;
881 WaveView::set_channel (int channel)
883 if (channel != _channel) {
886 invalidate_image_cache ();
889 _bounding_box_dirty = true;
895 WaveView::set_logscaled (bool yn)
897 if (_logscaled != yn) {
898 begin_visual_change ();
899 invalidate_image_cache ();
901 end_visual_change ();
906 WaveView::gain_changed ()
908 begin_visual_change ();
909 invalidate_image_cache ();
910 _region_amplitude = _region->scale_amplitude ();
911 end_visual_change ();
915 WaveView::set_zero_color (Color c)
917 if (_zero_color != c) {
918 begin_visual_change ();
919 invalidate_image_cache ();
921 end_visual_change ();
926 WaveView::set_clip_color (Color c)
928 if (_clip_color != c) {
929 begin_visual_change ();
930 invalidate_image_cache ();
932 end_visual_change ();
937 WaveView::set_show_zero_line (bool yn)
939 if (_show_zero != yn) {
940 begin_visual_change ();
941 invalidate_image_cache ();
943 end_visual_change ();
948 WaveView::set_shape (Shape s)
951 begin_visual_change ();
952 invalidate_image_cache ();
954 end_visual_change ();
959 WaveView::set_amplitude_above_axis (double a)
961 if (_amplitude_above_axis != a) {
962 begin_visual_change ();
963 invalidate_image_cache ();
964 _amplitude_above_axis = a;
965 end_visual_change ();
970 WaveView::set_global_shape (Shape s)
972 if (_global_shape != s) {
974 VisualPropertiesChanged (); /* EMIT SIGNAL */
979 WaveView::set_global_logscaled (bool yn)
981 if (_global_logscaled != yn) {
982 _global_logscaled = yn;
983 VisualPropertiesChanged (); /* EMIT SIGNAL */
988 WaveView::set_region_start (frameoffset_t start)
994 if (_region_start == start) {
999 _region_start = start;
1000 _bounding_box_dirty = true;
1005 WaveView::region_resized ()
1007 /* Called when the region start or end (thus length) has changed.
1015 _region_start = _region->start();
1016 _bounding_box_dirty = true;
1021 WaveView::set_global_gradient_depth (double depth)
1023 if (_global_gradient_depth != depth) {
1024 _global_gradient_depth = depth;
1025 VisualPropertiesChanged (); /* EMIT SIGNAL */
1030 WaveView::set_global_show_waveform_clipping (bool yn)
1032 if (_global_show_waveform_clipping != yn) {
1033 _global_show_waveform_clipping = yn;
1034 VisualPropertiesChanged (); /* EMIT SIGNAL */