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 ())
75 , _region_start (region->start())
77 VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
78 ClipLevelChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_clip_level_change, this));
81 WaveView::WaveView (Item* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
85 , _samples_per_pixel (0)
88 , _zero_color (0xff0000ff)
89 , _clip_color (0xff0000ff)
90 , _logscaled (_global_logscaled)
91 , _shape (_global_shape)
92 , _gradient_depth (_global_gradient_depth)
93 , _shape_independent (false)
94 , _logscaled_independent (false)
95 , _gradient_depth_independent (false)
96 , _amplitude_above_axis (1.0)
97 , _region_amplitude (_region->scale_amplitude ())
98 , _region_start (region->start())
100 VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
101 ClipLevelChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_clip_level_change, this));
104 WaveView::~WaveView ()
106 invalidate_image_cache ();
110 WaveView::handle_visual_property_change ()
112 bool changed = false;
114 if (!_shape_independent && (_shape != global_shape())) {
115 _shape = global_shape();
119 if (!_logscaled_independent && (_logscaled != global_logscaled())) {
120 _logscaled = global_logscaled();
124 if (!_gradient_depth_independent && (_gradient_depth != global_gradient_depth())) {
125 _gradient_depth = global_gradient_depth();
130 begin_visual_change ();
131 invalidate_image_cache ();
132 end_visual_change ();
137 WaveView::handle_clip_level_change ()
139 begin_visual_change ();
140 invalidate_image_cache ();
141 end_visual_change ();
145 WaveView::set_fill_color (Color c)
147 if (c != _fill_color) {
148 begin_visual_change ();
149 invalidate_image_cache ();
150 Fill::set_fill_color (c);
151 end_visual_change ();
156 WaveView::set_outline_color (Color c)
158 if (c != _outline_color) {
159 begin_visual_change ();
160 invalidate_image_cache ();
161 Outline::set_outline_color (c);
162 end_visual_change ();
167 WaveView::set_samples_per_pixel (double samples_per_pixel)
169 if (samples_per_pixel != _samples_per_pixel) {
172 invalidate_image_cache ();
173 _samples_per_pixel = samples_per_pixel;
174 _bounding_box_dirty = true;
181 window_to_image (double wave_origin, double image_start)
183 return image_start - wave_origin;
187 _log_meter (float power, double lower_db, double upper_db, double non_linearity)
189 return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity));
193 alt_log_meter (float power)
195 return _log_meter (power, -192.0, 0.0, 8.0);
199 WaveView::set_clip_level (double dB)
201 const double clip_level = dB_to_coefficient (dB);
202 if (clip_level != _clip_level) {
203 _clip_level = clip_level;
209 WaveView::invalidate_image_cache ()
211 vector <uint32_t> deletion_list;
212 vector <CacheEntry> caches;
214 /* The source may have disappeared in the case of rec regions.*/
215 if (_region->n_channels() == 0) {
216 std::map <boost::shared_ptr<ARDOUR::AudioSource>, std::vector <CacheEntry> >::iterator i;
217 for (i = _image_cache.begin(); i != _image_cache.end(); ++i) {
218 if (i->first.unique()) {
219 for (uint32_t n = 0; n < (*i).second.size (); ++n) {
220 (*i).second[n].image.clear ();
222 (*i).second.clear ();
223 _image_cache.erase(i->first);
229 if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
230 caches = _image_cache.find (_region->audio_source ())->second;
235 for (uint32_t i = 0; i < caches.size (); ++i) {
237 if (_channel != caches[i].channel
238 || _height != caches[i].height
239 || _region_amplitude != caches[i].amplitude
240 || _fill_color != caches[i].fill_color) {
245 deletion_list.push_back (i);
248 while (deletion_list.size() > 0) {
249 caches[deletion_list.back ()].image.clear ();
250 caches.erase (caches.begin() + deletion_list.back());
251 deletion_list.pop_back();
254 if (caches.size () == 0) {
255 _image_cache.erase(_region->audio_source ());
257 _image_cache[_region->audio_source ()] = caches;
262 WaveView::consolidate_image_cache () const
264 list <uint32_t> deletion_list;
265 vector <CacheEntry> caches;
266 uint32_t other_entries = 0;
268 if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
269 caches = _image_cache.find (_region->audio_source ())->second;
272 for (uint32_t i = 0; i < caches.size (); ++i) {
274 if (_channel != caches[i].channel
275 || _height != caches[i].height
276 || _region_amplitude != caches[i].amplitude
277 || _fill_color != caches[i].fill_color) {
283 framepos_t segment_start = caches[i].start;
284 framepos_t segment_end = caches[i].end;
286 for (uint32_t j = i; j < caches.size (); ++j) {
288 if (i == j || _channel != caches[j].channel
289 || _height != caches[i].height
290 || _region_amplitude != caches[i].amplitude
291 || _fill_color != caches[i].fill_color) {
296 if (caches[j].start >= segment_start && caches[j].end <= segment_end) {
298 deletion_list.push_back (j);
303 deletion_list.sort ();
304 deletion_list.unique ();
306 while (deletion_list.size() > 0) {
307 caches[deletion_list.back ()].image.clear ();
308 caches.erase (caches.begin() + deletion_list.back ());
309 deletion_list.pop_back();
312 /* We don't care if this channel/height/amplitude has anything in the cache - just drop the Last Added entries
313 until we reach a size where there is a maximum of CACHE_HIGH_WATER + other entries.
316 while (caches.size() > CACHE_HIGH_WATER + other_entries) {
317 caches.front ().image.clear ();
318 caches.erase(caches.begin ());
321 if (caches.size () == 0) {
322 _image_cache.erase (_region->audio_source ());
324 _image_cache[_region->audio_source ()] = caches;
329 WaveView::y_extent (double s, bool /*round_to_lower_edge*/) const
331 /* it is important that this returns an integral value, so that we
332 * can ensure correct single pixel behaviour.
334 * we need (_height - max(wave_line_width))
335 * wave_line_width == 1 IFF top==bottom (1 sample per pixel or flat line)
336 * wave_line_width == 2 otherwise
337 * then round away from the zero line, towards peak
339 if (_shape == Rectified) {
340 // we only ever have 1 point and align to the bottom (not center)
341 return floor ((1.0 - s) * (_height - 2.0));
343 /* currently canvas rectangle is off-by-one and we
344 * cannot draw a pixel at 0 (-.5 .. +.5) without it being
345 * clipped. A value 1.0 (ideally one point at y=0) ends
346 * up a pixel down. and a value of -1.0 (ideally y = _height-1)
347 * currently is on the bottom separator line :(
348 * So to make the complete waveform appear centered in
349 * a region, we translate by +.5 (instead of -.5)
350 * and waste two pixel of height: -4 (instad of -2)
352 * This needs fixing in canvas/rectangle the intersect
353 * functions and probably a couple of other places as well...
357 pos = ceil ((1.0 - s) * .5 * (_height - 4.0));
359 pos = floor ((1.0 - s) * .5 * (_height - 4.0));
361 return min (_height - 4.0, (max (0.0, pos)));
366 WaveView::draw_absent_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peaks, int n_peaks) const
368 Cairo::RefPtr<Cairo::ImageSurface> stripe = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
370 Cairo::RefPtr<Cairo::Context> stripe_context = Cairo::Context::create (stripe);
371 stripe_context->set_antialias (Cairo::ANTIALIAS_NONE);
373 uint32_t stripe_separation = 150;
374 double start = - floor (_height / stripe_separation) * stripe_separation;
377 while (start < n_peaks) {
379 stripe_context->move_to (start, 0);
380 stripe_x = start + _height;
381 stripe_context->line_to (stripe_x, _height);
382 start += stripe_separation;
385 stripe_context->set_source_rgba (1.0, 1.0, 1.0, 1.0);
386 stripe_context->set_line_cap (Cairo::LINE_CAP_SQUARE);
387 stripe_context->set_line_width(50);
388 stripe_context->stroke();
390 Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
392 context->set_source_rgba (1.0, 1.0, 0.0, 0.3);
393 context->mask (stripe, 0, 0);
404 LineTips() : top (0.0), bot (0.0), clip_max (false), clip_min (false) {}
408 Cairo::RefPtr<Cairo::ImageSurface> wave;
409 Cairo::RefPtr<Cairo::ImageSurface> outline;
410 Cairo::RefPtr<Cairo::ImageSurface> clip;
411 Cairo::RefPtr<Cairo::ImageSurface> zero;
414 wave (0), outline (0), clip (0), zero (0) {}
418 WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peaks, int n_peaks) const
423 images.wave = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
424 images.outline = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
425 images.clip = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
426 images.zero = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
428 Cairo::RefPtr<Cairo::Context> wave_context = Cairo::Context::create (images.wave);
429 Cairo::RefPtr<Cairo::Context> outline_context = Cairo::Context::create (images.outline);
430 Cairo::RefPtr<Cairo::Context> clip_context = Cairo::Context::create (images.clip);
431 Cairo::RefPtr<Cairo::Context> zero_context = Cairo::Context::create (images.zero);
432 wave_context->set_antialias (Cairo::ANTIALIAS_NONE);
433 outline_context->set_antialias (Cairo::ANTIALIAS_NONE);
434 clip_context->set_antialias (Cairo::ANTIALIAS_NONE);
435 zero_context->set_antialias (Cairo::ANTIALIAS_NONE);
437 boost::scoped_array<LineTips> tips (new LineTips[n_peaks]);
439 /* Clip level nominally set to -0.9dBFS to account for inter-sample
440 interpolation possibly clipping (value may be too low).
442 We adjust by the region's own gain (but note: not by any gain
443 automation or its gain envelope) so that clip indicators are closer
444 to providing data about on-disk data. This multiplication is
445 needed because the data we get from AudioRegion::read_peaks()
446 has been scaled by scale_amplitude() already.
449 const double clip_level = _clip_level * _region_amplitude;
451 if (_shape == WaveView::Rectified) {
453 /* each peak is a line from the bottom of the waveview
454 * to a point determined by max (_peaks[i].max,
459 for (int i = 0; i < n_peaks; ++i) {
461 tips[i].bot = height() - 1.0;
462 const double p = alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min))));
463 tips[i].top = y_extent (p, false);
464 tips[i].spread = p * (_height - 1.0);
466 if (_peaks[i].max >= clip_level) {
467 tips[i].clip_max = true;
470 if (-(_peaks[i].min) >= clip_level) {
471 tips[i].clip_min = true;
476 for (int i = 0; i < n_peaks; ++i) {
478 tips[i].bot = height() - 1.0;
479 const double p = max(fabs (_peaks[i].max), fabs (_peaks[i].min));
480 tips[i].top = y_extent (p, false);
481 tips[i].spread = p * (_height - 2.0);
482 if (p >= clip_level) {
483 tips[i].clip_max = true;
492 for (int i = 0; i < n_peaks; ++i) {
493 double top = _peaks[i].max;
494 double bot = _peaks[i].min;
496 if (_peaks[i].max >= clip_level) {
497 tips[i].clip_max = true;
499 if (-(_peaks[i].min) >= clip_level) {
500 tips[i].clip_min = true;
504 top = alt_log_meter (fast_coefficient_to_dB (top));
505 } else if (top < 0.0) {
506 top =-alt_log_meter (fast_coefficient_to_dB (-top));
512 bot = alt_log_meter (fast_coefficient_to_dB (bot));
513 } else if (bot < 0.0) {
514 bot = -alt_log_meter (fast_coefficient_to_dB (-bot));
519 tips[i].top = y_extent (top, false);
520 tips[i].bot = y_extent (bot, true);
521 tips[i].spread = tips[i].bot - tips[i].top;
525 for (int i = 0; i < n_peaks; ++i) {
526 if (_peaks[i].max >= clip_level) {
527 tips[i].clip_max = true;
529 if (-(_peaks[i].min) >= clip_level) {
530 tips[i].clip_min = true;
533 tips[i].top = y_extent (_peaks[i].max, false);
534 tips[i].bot = y_extent (_peaks[i].min, true);
535 tips[i].spread = tips[i].bot - tips[i].top;
540 Color alpha_one = rgba_to_color (0, 0, 0, 1.0);
542 set_source_rgba (wave_context, alpha_one);
543 set_source_rgba (outline_context, alpha_one);
544 set_source_rgba (clip_context, alpha_one);
545 set_source_rgba (zero_context, alpha_one);
547 /* ensure single-pixel lines */
549 wave_context->set_line_width (1.0);
550 wave_context->translate (0.5, +0.5);
552 outline_context->set_line_width (1.0);
553 outline_context->translate (0.5, +0.5);
555 clip_context->set_line_width (1.0);
556 clip_context->translate (0.5, +0.5);
558 zero_context->set_line_width (1.0);
559 zero_context->translate (0.5, +0.5);
561 /* the height of the clip-indicator should be at most 7 pixels,
562 * or 5% of the height of the waveview item.
565 const double clip_height = min (7.0, ceil (_height * 0.05));
566 bool draw_outline_as_wave = false;
568 /* There are 3 possible components to draw at each x-axis position: the
569 waveform "line", the zero line and an outline/clip indicator. We
570 have to decide which of the 3 to draw at each position, pixel by
571 pixel. This makes the rendering less efficient but it is the only
572 way I can see to do this correctly.
574 To avoid constant source swapping and stroking, we draw the components separately
575 onto four alpha only image surfaces for use as a mask.
577 With only 1 pixel of spread between the top and bottom of the line,
578 we just draw the upper outline/clip indicator.
580 With 2 pixels of spread, we draw the upper and lower outline clip
583 With 3 pixels of spread we draw the upper and lower outline/clip
584 indicators and at least 1 pixel of the waveform line.
586 With 5 pixels of spread, we draw all components.
588 We can do rectified as two separate passes because we have a much
589 easier decision regarding whether to draw the waveform line. We
590 always draw the clip/outline indicators.
593 if (_shape == WaveView::Rectified) {
595 for (int i = 0; i < n_peaks; ++i) {
599 if (tips[i].spread >= 1.0) {
600 wave_context->move_to (i, tips[i].top);
601 wave_context->line_to (i, tips[i].bot);
604 if (_global_show_waveform_clipping && (tips[i].clip_max)) {
605 clip_context->move_to (i, tips[i].top);
606 /* clip-indicating upper terminal line */
607 clip_context->rel_line_to (0, min (clip_height, ceil(tips[i].spread + .5)));
609 outline_context->move_to (i, tips[i].top);
610 /* normal upper terminal dot */
611 outline_context->close_path ();
615 wave_context->stroke ();
616 clip_context->stroke ();
617 outline_context->stroke ();
620 const double height_2 = (_height - 4.0) * .5;
622 for (int i = 0; i < n_peaks; ++i) {
626 if (tips[i].spread >= 2.0) {
627 wave_context->move_to (i, tips[i].top);
628 wave_context->line_to (i, tips[i].bot);
630 /* draw square waves and other discontiguous points clearly */
632 if (tips[i-1].top + 2 < tips[i].top) {
633 wave_context->move_to (i-1, tips[i-1].top);
634 wave_context->line_to (i-1, (tips[i].bot + tips[i-1].top)/2);
635 wave_context->move_to (i, (tips[i].bot + tips[i-1].top)/2);
636 wave_context->line_to (i, tips[i].top);
637 } else if (tips[i-1].bot > tips[i].bot + 2) {
638 wave_context->move_to (i-1, tips[i-1].bot);
639 wave_context->line_to (i-1, (tips[i].top + tips[i-1].bot)/2);
640 wave_context->move_to (i, (tips[i].top + tips[i-1].bot)/2);
641 wave_context->line_to (i, tips[i].bot);
647 if (tips[i].spread >= 5.0 && show_zero_line()) {
648 zero_context->move_to (i, floor(height_2));
649 zero_context->rel_line_to (1.0, 0);
652 if (tips[i].spread > 1.0) {
653 draw_outline_as_wave = false;
654 /* lower outline/clip indicator */
655 if (_global_show_waveform_clipping && tips[i].clip_min) {
656 clip_context->move_to (i, tips[i].bot);
657 /* clip-indicating lower terminal line */
658 const double sign = tips[i].bot > height_2 ? -1 : 1;
659 clip_context->rel_line_to (0, sign * min (clip_height, ceil (tips[i].spread + .5)));
661 outline_context->move_to (i, tips[i].bot + 0.5);
662 /* normal lower terminal dot */
663 outline_context->rel_line_to (0, -0.5);
666 draw_outline_as_wave = true;
667 if (tips[i].clip_min) {
668 // make sure we draw the clip
669 tips[i].clip_max = true;
673 /* upper outline/clip indicator */
674 if (_global_show_waveform_clipping && tips[i].clip_max) {
675 clip_context->move_to (i, tips[i].top);
676 /* clip-indicating upper terminal line */
677 const double sign = tips[i].top > height_2 ? -1 : 1;
678 clip_context->rel_line_to (0, sign * min(clip_height, ceil(tips[i].spread + .5)));
680 if (draw_outline_as_wave) {
681 wave_context->move_to (i, tips[i].top + 0.5);
682 /* special case where outline only is drawn.
683 is this correct? too short by 0.5?
685 wave_context->rel_line_to (0, -0.5);
687 outline_context->move_to (i, tips[i].top + 0.5);
688 /* normal upper terminal dot */
689 outline_context->rel_line_to (0, -0.5);
694 wave_context->stroke ();
695 outline_context->stroke ();
696 clip_context->stroke ();
697 zero_context->stroke ();
700 Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
702 /* Here we set a source colour and use the various components as a mask. */
704 if (gradient_depth() != 0.0) {
706 Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _height));
712 if (_shape == Rectified) {
722 color_to_rgba (_fill_color, r, g, b, a);
723 gradient->add_color_stop_rgba (stops[1], r, g, b, a);
724 /* generate a new color for the middle of the gradient */
726 color_to_hsv (_fill_color, h, s, v);
727 /* change v towards white */
728 v *= 1.0 - gradient_depth();
729 Color center = hsva_to_color (h, s, v, a);
730 color_to_rgba (center, r, g, b, a);
732 gradient->add_color_stop_rgba (stops[0], r, g, b, a);
733 gradient->add_color_stop_rgba (stops[2], r, g, b, a);
735 context->set_source (gradient);
737 set_source_rgba (context, _fill_color);
740 context->mask (images.wave, 0, 0);
743 set_source_rgba (context, _outline_color);
744 context->mask (images.outline, 0, 0);
747 set_source_rgba (context, _clip_color);
748 context->mask (images.clip, 0, 0);
751 set_source_rgba (context, _zero_color);
752 context->mask (images.zero, 0, 0);
758 WaveView::get_image (Cairo::RefPtr<Cairo::ImageSurface>& image, framepos_t start, framepos_t end, double& image_offset) const
760 vector <CacheEntry> caches;
762 if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
764 caches = _image_cache.find (_region->audio_source ())->second;
767 /* Find a suitable ImageSurface.
769 for (uint32_t i = 0; i < caches.size (); ++i) {
771 if (_channel != caches[i].channel
772 || _height != caches[i].height
773 || _region_amplitude != caches[i].amplitude
774 || _fill_color != caches[i].fill_color) {
779 framepos_t segment_start = caches[i].start;
780 framepos_t segment_end = caches[i].end;
782 if (end <= segment_end && start >= segment_start) {
783 image_offset = (segment_start - _region_start) / _samples_per_pixel;
784 image = caches[i].image;
790 consolidate_image_cache ();
792 /* sample position is canonical here, and we want to generate
793 * an image that spans about twice the canvas width
796 const framepos_t center = start + ((end - start) / 2);
797 const framecnt_t canvas_samples = _canvas->visible_area().width() * _samples_per_pixel; /* one canvas width */
799 /* we can request data from anywhere in the Source, between 0 and its length
802 framepos_t sample_start = max ((framepos_t) 0, (center - canvas_samples));
803 framepos_t sample_end = min (center + canvas_samples, _region->source_length (0));
805 const int n_peaks = llrintf ((sample_end - sample_start)/ (double) _samples_per_pixel);
807 boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
809 framecnt_t peaks_read;
810 peaks_read = _region->read_peaks (peaks.get(), n_peaks,
811 sample_start, sample_end - sample_start,
815 image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, _height);
817 if (peaks_read > 0) {
818 draw_image (image, peaks.get(), n_peaks);
820 draw_absent_image (image, peaks.get(), n_peaks);
823 _image_cache[_region->audio_source ()].push_back (CacheEntry (_channel, _height, _region_amplitude, _fill_color, sample_start, sample_end, image));
825 image_offset = (sample_start - _region->start()) / _samples_per_pixel;
827 //cerr << "_image_cache size is : " << _image_cache.size() << " entries for this audiosource : " << _image_cache.find (_region->audio_source ())->second.size() << endl;
833 WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
835 assert (_samples_per_pixel != 0);
841 Rect self = item_to_window (Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height));
842 boost::optional<Rect> d = self.intersection (area);
850 /* window coordinates - pixels where x=0 is the left edge of the canvas
851 * window. We round down in case we were asked to
852 * draw "between" pixels at the start and/or end.
855 double draw_start = floor (draw.x0);
856 const double draw_end = floor (draw.x1);
858 // cerr << "Need to draw " << draw_start << " .. " << draw_end << endl;
860 /* image coordnates: pixels where x=0 is the start of this waveview,
861 * wherever it may be positioned. thus image_start=N means "an image
862 * that beings N pixels after the start of region that this waveview is
866 const framepos_t image_start = window_to_image (self.x0, draw_start);
867 const framepos_t image_end = window_to_image (self.x0, draw_end);
869 // cerr << "Image/WV space: " << image_start << " .. " << image_end << endl;
871 /* sample coordinates - note, these are not subject to rounding error */
872 framepos_t sample_start = _region_start + (image_start * _samples_per_pixel);
873 framepos_t sample_end = _region_start + (image_end * _samples_per_pixel);
875 // cerr << "Sample space: " << sample_start << " .. " << sample_end << endl;
877 Cairo::RefPtr<Cairo::ImageSurface> image;
878 double image_offset = 0;
880 get_image (image, sample_start, sample_end, image_offset);
882 // cerr << "Offset into image to place at zero: " << image_offset << endl;
884 if (_start_shift && (sample_start == _region_start) && (self.x0 == draw.x0)) {
885 /* we are going to draw the first pixel for this region, but
886 we may not want this to overlap a border around the
887 waveform. If so, _start_shift will be set.
889 //cerr << name.substr (23) << " ss = " << sample_start << " rs = " << _region_start << " sf = " << _start_shift << " ds = " << draw_start << " self = " << self << " draw = " << draw << endl;
890 //draw_start += _start_shift;
891 //image_offset += _start_shift;
894 context->rectangle (draw_start, draw.y0, draw_end - draw_start, draw.height());
896 /* round image origin position to an exact pixel in device space to
900 double x = self.x0 + image_offset;
902 context->user_to_device (x, y);
905 context->device_to_user (x, y);
907 context->set_source (image, x, y);
913 WaveView::compute_bounding_box () const
916 _bounding_box = Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height);
918 _bounding_box = boost::optional<Rect> ();
921 _bounding_box_dirty = false;
925 WaveView::set_height (Distance height)
927 if (height != _height) {
930 invalidate_image_cache ();
933 _bounding_box_dirty = true;
939 WaveView::set_channel (int channel)
941 if (channel != _channel) {
944 invalidate_image_cache ();
947 _bounding_box_dirty = true;
953 WaveView::set_logscaled (bool yn)
955 if (_logscaled != yn) {
956 begin_visual_change ();
957 invalidate_image_cache ();
959 end_visual_change ();
964 WaveView::gain_changed ()
966 begin_visual_change ();
967 invalidate_image_cache ();
968 _region_amplitude = _region->scale_amplitude ();
969 end_visual_change ();
973 WaveView::set_zero_color (Color c)
975 if (_zero_color != c) {
976 begin_visual_change ();
977 invalidate_image_cache ();
979 end_visual_change ();
984 WaveView::set_clip_color (Color c)
986 if (_clip_color != c) {
987 begin_visual_change ();
988 invalidate_image_cache ();
990 end_visual_change ();
995 WaveView::set_show_zero_line (bool yn)
997 if (_show_zero != yn) {
998 begin_visual_change ();
999 invalidate_image_cache ();
1001 end_visual_change ();
1006 WaveView::set_shape (Shape s)
1009 begin_visual_change ();
1010 invalidate_image_cache ();
1012 end_visual_change ();
1017 WaveView::set_amplitude_above_axis (double a)
1019 if (_amplitude_above_axis != a) {
1020 begin_visual_change ();
1021 invalidate_image_cache ();
1022 _amplitude_above_axis = a;
1023 end_visual_change ();
1028 WaveView::set_global_shape (Shape s)
1030 if (_global_shape != s) {
1032 VisualPropertiesChanged (); /* EMIT SIGNAL */
1037 WaveView::set_global_logscaled (bool yn)
1039 if (_global_logscaled != yn) {
1040 _global_logscaled = yn;
1041 VisualPropertiesChanged (); /* EMIT SIGNAL */
1046 WaveView::set_region_start (frameoffset_t start)
1052 if (_region_start == start) {
1057 _region_start = start;
1058 _bounding_box_dirty = true;
1063 WaveView::region_resized ()
1065 /* Called when the region start or end (thus length) has changed.
1073 _region_start = _region->start();
1074 _bounding_box_dirty = true;
1079 WaveView::set_global_gradient_depth (double depth)
1081 if (_global_gradient_depth != depth) {
1082 _global_gradient_depth = depth;
1083 VisualPropertiesChanged (); /* EMIT SIGNAL */
1088 WaveView::set_global_show_waveform_clipping (bool yn)
1090 if (_global_show_waveform_clipping != yn) {
1091 _global_show_waveform_clipping = yn;
1092 ClipLevelChanged ();
1097 WaveView::set_start_shift (double pixels)
1103 begin_visual_change ();
1104 _start_shift = pixels;
1105 end_visual_change ();