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 <glibmm/threads.h>
26 #include "gtkmm2ext/utils.h"
27 #include "gtkmm2ext/gui_thread.h"
29 #include "pbd/base_ui.h"
30 #include "pbd/compose.h"
31 #include "pbd/convert.h"
32 #include "pbd/signals.h"
33 #include "pbd/stacktrace.h"
35 #include "ardour/types.h"
36 #include "ardour/dB.h"
37 #include "ardour/lmath.h"
38 #include "ardour/audioregion.h"
39 #include "ardour/audiosource.h"
40 #include "ardour/session.h"
42 #include "canvas/canvas.h"
43 #include "canvas/colors.h"
44 #include "canvas/debug.h"
45 #include "canvas/utils.h"
46 #include "canvas/wave_view.h"
48 #include "evoral/Range.hpp"
50 #include <gdkmm/general.h>
52 #include "gtkmm2ext/gui_thread.h"
55 using namespace ARDOUR;
57 using namespace ArdourCanvas;
59 double WaveView::_global_gradient_depth = 0.6;
60 bool WaveView::_global_logscaled = false;
61 WaveView::Shape WaveView::_global_shape = WaveView::Normal;
62 bool WaveView::_global_show_waveform_clipping = true;
63 double WaveView::_clip_level = 0.98853;
65 WaveViewCache* WaveView::images = 0;
66 gint WaveView::drawing_thread_should_quit = 0;
67 Glib::Threads::Mutex WaveView::request_queue_lock;
68 Glib::Threads::Cond WaveView::request_cond;
69 Glib::Threads::Thread* WaveView::_drawing_thread = 0;
70 WaveView::DrawingRequestQueue WaveView::request_queue;
72 PBD::Signal0<void> WaveView::VisualPropertiesChanged;
73 PBD::Signal0<void> WaveView::ClipLevelChanged;
75 WaveView::WaveView (Canvas* c, boost::shared_ptr<ARDOUR::AudioRegion> region)
79 , _samples_per_pixel (0)
82 , _zero_color (0xff0000ff)
83 , _clip_color (0xff0000ff)
84 , _logscaled (_global_logscaled)
85 , _shape (_global_shape)
86 , _gradient_depth (_global_gradient_depth)
87 , _shape_independent (false)
88 , _logscaled_independent (false)
89 , _gradient_depth_independent (false)
90 , _amplitude_above_axis (1.0)
91 , _region_amplitude (region->scale_amplitude ())
93 , _region_start (region->start())
94 , get_image_in_thread (false)
95 , always_get_image_in_thread (false)
99 images = new WaveViewCache;
102 VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
103 ClipLevelChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_clip_level_change, this));
105 ImageReady.connect (image_ready_connection, invalidator (*this), boost::bind (&WaveView::image_ready, this), gui_context());
108 WaveView::WaveView (Item* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
112 , _samples_per_pixel (0)
115 , _zero_color (0xff0000ff)
116 , _clip_color (0xff0000ff)
117 , _logscaled (_global_logscaled)
118 , _shape (_global_shape)
119 , _gradient_depth (_global_gradient_depth)
120 , _shape_independent (false)
121 , _logscaled_independent (false)
122 , _gradient_depth_independent (false)
123 , _amplitude_above_axis (1.0)
124 , _region_amplitude (region->scale_amplitude ())
126 , _region_start (region->start())
127 , get_image_in_thread (false)
128 , always_get_image_in_thread (false)
132 images = new WaveViewCache;
135 VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
136 ClipLevelChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_clip_level_change, this));
138 ImageReady.connect (image_ready_connection, invalidator (*this), boost::bind (&WaveView::image_ready, this), gui_context());
141 WaveView::~WaveView ()
143 invalidate_image_cache ();
147 WaveView::debug_name() const
149 return _region->name() + string (":") + PBD::to_string (_channel+1, std::dec);
153 WaveView::image_ready ()
155 DEBUG_TRACE (DEBUG::WaveView, string_compose ("queue draw for %1 at %2 (vis = %3 CR %4)\n", this, g_get_monotonic_time(), visible(), current_request));
160 WaveView::set_always_get_image_in_thread (bool yn)
162 always_get_image_in_thread = yn;
166 WaveView::handle_visual_property_change ()
168 bool changed = false;
170 if (!_shape_independent && (_shape != global_shape())) {
171 _shape = global_shape();
175 if (!_logscaled_independent && (_logscaled != global_logscaled())) {
176 _logscaled = global_logscaled();
180 if (!_gradient_depth_independent && (_gradient_depth != global_gradient_depth())) {
181 _gradient_depth = global_gradient_depth();
186 begin_visual_change ();
187 invalidate_image_cache ();
188 end_visual_change ();
193 WaveView::handle_clip_level_change ()
195 begin_visual_change ();
196 invalidate_image_cache ();
197 end_visual_change ();
201 WaveView::set_fill_color (Color c)
203 if (c != _fill_color) {
204 begin_visual_change ();
205 invalidate_image_cache ();
206 Fill::set_fill_color (c);
207 end_visual_change ();
212 WaveView::set_outline_color (Color c)
214 if (c != _outline_color) {
215 begin_visual_change ();
216 invalidate_image_cache ();
217 Outline::set_outline_color (c);
218 end_visual_change ();
223 WaveView::set_samples_per_pixel (double samples_per_pixel)
225 if (samples_per_pixel != _samples_per_pixel) {
228 invalidate_image_cache ();
229 _samples_per_pixel = samples_per_pixel;
230 _bounding_box_dirty = true;
237 _log_meter (float power, double lower_db, double upper_db, double non_linearity)
239 return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity));
243 alt_log_meter (float power)
245 return _log_meter (power, -192.0, 0.0, 8.0);
249 WaveView::set_clip_level (double dB)
251 const double clip_level = dB_to_coefficient (dB);
252 if (clip_level != _clip_level) {
253 _clip_level = clip_level;
259 WaveView::invalidate_image_cache ()
261 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 invalidates image cache and cancels current request\n", this));
262 cancel_my_render_request ();
263 _current_image.reset ();
267 WaveView::compute_tips (PeakData const & peak, WaveView::LineTips& tips) const
269 const double effective_height = _height;
271 /* remember: canvas (and cairo) coordinate space puts the origin at the upper left.
273 So, a sample value of 1.0 (0dbFS) will be computed as:
275 (1.0 - 1.0) * 0.5 * effective_height
277 which evaluates to 0, or the top of the image.
279 A sample value of -1.0 will be computed as
281 (1.0 + 1.0) * 0.5 * effective height
283 which evaluates to effective height, or the bottom of the image.
286 const double pmax = (1.0 - peak.max) * 0.5 * effective_height;
287 const double pmin = (1.0 - peak.min) * 0.5 * effective_height;
289 /* remember that the bottom of the image (pmin) has larger y-coordinates
293 double spread = (pmin - pmax) * 0.5;
295 /* find the nearest pixel to the nominal center. */
296 const double center = round (pmin - spread);
299 /* minimum distance between line ends is 1 pixel, and we want it "centered" on a pixel,
300 as per cairo single-pixel line issues.
302 NOTE: the caller will not draw a line between these two points if the spread is
303 less than 2 pixels. So only the tips.top value matters, which is where we will
304 draw a single pixel as part of the outline.
307 tips.bot = center + 1.0;
309 /* round spread above and below center to an integer number of pixels */
310 spread = round (spread);
311 /* top and bottom are located equally either side of the center */
312 tips.top = center - spread;
313 tips.bot = center + spread;
316 tips.top = min (effective_height, max (0.0, tips.top));
317 tips.bot = min (effective_height, max (0.0, tips.bot));
322 WaveView::y_extent (double s) const
324 assert (_shape == Rectified);
325 return floor ((1.0 - s) * _height);
329 WaveView::draw_absent_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peaks, int n_peaks) const
331 Cairo::RefPtr<Cairo::ImageSurface> stripe = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
333 Cairo::RefPtr<Cairo::Context> stripe_context = Cairo::Context::create (stripe);
334 stripe_context->set_antialias (Cairo::ANTIALIAS_NONE);
336 uint32_t stripe_separation = 150;
337 double start = - floor (_height / stripe_separation) * stripe_separation;
340 while (start < n_peaks) {
342 stripe_context->move_to (start, 0);
343 stripe_x = start + _height;
344 stripe_context->line_to (stripe_x, _height);
345 start += stripe_separation;
348 stripe_context->set_source_rgba (1.0, 1.0, 1.0, 1.0);
349 stripe_context->set_line_cap (Cairo::LINE_CAP_SQUARE);
350 stripe_context->set_line_width(50);
351 stripe_context->stroke();
353 Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
355 context->set_source_rgba (1.0, 1.0, 0.0, 0.3);
356 context->mask (stripe, 0, 0);
361 Cairo::RefPtr<Cairo::ImageSurface> wave;
362 Cairo::RefPtr<Cairo::ImageSurface> outline;
363 Cairo::RefPtr<Cairo::ImageSurface> clip;
364 Cairo::RefPtr<Cairo::ImageSurface> zero;
367 wave (0), outline (0), clip (0), zero (0) {}
371 WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peaks, int n_peaks, boost::shared_ptr<WaveViewThreadRequest> req) const
376 images.wave = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
377 images.outline = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
378 images.clip = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
379 images.zero = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
381 Cairo::RefPtr<Cairo::Context> wave_context = Cairo::Context::create (images.wave);
382 Cairo::RefPtr<Cairo::Context> outline_context = Cairo::Context::create (images.outline);
383 Cairo::RefPtr<Cairo::Context> clip_context = Cairo::Context::create (images.clip);
384 Cairo::RefPtr<Cairo::Context> zero_context = Cairo::Context::create (images.zero);
385 wave_context->set_antialias (Cairo::ANTIALIAS_NONE);
386 outline_context->set_antialias (Cairo::ANTIALIAS_NONE);
387 clip_context->set_antialias (Cairo::ANTIALIAS_NONE);
388 zero_context->set_antialias (Cairo::ANTIALIAS_NONE);
390 boost::scoped_array<LineTips> tips (new LineTips[n_peaks]);
392 /* Clip level nominally set to -0.9dBFS to account for inter-sample
393 interpolation possibly clipping (value may be too low).
395 We adjust by the region's own gain (but note: not by any gain
396 automation or its gain envelope) so that clip indicators are closer
397 to providing data about on-disk data. This multiplication is
398 needed because the data we get from AudioRegion::read_peaks()
399 has been scaled by scale_amplitude() already.
402 const double clip_level = _clip_level * _region_amplitude;
404 if (_shape == WaveView::Rectified) {
406 /* each peak is a line from the bottom of the waveview
407 * to a point determined by max (_peaks[i].max,
412 for (int i = 0; i < n_peaks; ++i) {
414 tips[i].bot = height() - 1.0;
415 const double p = alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min))));
416 tips[i].top = y_extent (p);
417 tips[i].spread = p * _height;
419 if (_peaks[i].max >= clip_level) {
420 tips[i].clip_max = true;
423 if (-(_peaks[i].min) >= clip_level) {
424 tips[i].clip_min = true;
429 for (int i = 0; i < n_peaks; ++i) {
431 tips[i].bot = height() - 1.0;
432 const double p = max(fabs (_peaks[i].max), fabs (_peaks[i].min));
433 tips[i].top = y_extent (p);
434 tips[i].spread = p * _height;
435 if (p >= clip_level) {
436 tips[i].clip_max = true;
445 for (int i = 0; i < n_peaks; ++i) {
447 p.max = _peaks[i].max;
448 p.min = _peaks[i].min;
450 if (_peaks[i].max >= clip_level) {
451 tips[i].clip_max = true;
453 if (-(_peaks[i].min) >= clip_level) {
454 tips[i].clip_min = true;
458 p.max = alt_log_meter (fast_coefficient_to_dB (p.max));
459 } else if (p.max < 0.0) {
460 p.max =-alt_log_meter (fast_coefficient_to_dB (-p.max));
466 p.min = alt_log_meter (fast_coefficient_to_dB (p.min));
467 } else if (p.min < 0.0) {
468 p.min = -alt_log_meter (fast_coefficient_to_dB (-p.min));
473 compute_tips (p, tips[i]);
474 tips[i].spread = tips[i].bot - tips[i].top;
478 for (int i = 0; i < n_peaks; ++i) {
479 if (_peaks[i].max >= clip_level) {
480 tips[i].clip_max = true;
482 if (-(_peaks[i].min) >= clip_level) {
483 tips[i].clip_min = true;
486 compute_tips (_peaks[i], tips[i]);
487 tips[i].spread = tips[i].bot - tips[i].top;
493 if (req->should_stop()) {
497 Color alpha_one = rgba_to_color (0, 0, 0, 1.0);
499 set_source_rgba (wave_context, alpha_one);
500 set_source_rgba (outline_context, alpha_one);
501 set_source_rgba (clip_context, alpha_one);
502 set_source_rgba (zero_context, alpha_one);
504 /* ensure single-pixel lines */
506 wave_context->set_line_width (1.0);
507 wave_context->translate (0.5, 0.5);
509 outline_context->set_line_width (1.0);
510 outline_context->translate (0.5, 0.5);
512 clip_context->set_line_width (1.0);
513 clip_context->translate (0.5, 0.5);
515 zero_context->set_line_width (1.0);
516 zero_context->translate (0.5, 0.5);
518 /* the height of the clip-indicator should be at most 7 pixels,
519 * or 5% of the height of the waveview item.
522 const double clip_height = min (7.0, ceil (_height * 0.05));
524 /* There are 3 possible components to draw at each x-axis position: the
525 waveform "line", the zero line and an outline/clip indicator. We
526 have to decide which of the 3 to draw at each position, pixel by
527 pixel. This makes the rendering less efficient but it is the only
528 way I can see to do this correctly.
530 To avoid constant source swapping and stroking, we draw the components separately
531 onto four alpha only image surfaces for use as a mask.
533 With only 1 pixel of spread between the top and bottom of the line,
534 we just draw the upper outline/clip indicator.
536 With 2 pixels of spread, we draw the upper and lower outline clip
539 With 3 pixels of spread we draw the upper and lower outline/clip
540 indicators and at least 1 pixel of the waveform line.
542 With 5 pixels of spread, we draw all components.
544 We can do rectified as two separate passes because we have a much
545 easier decision regarding whether to draw the waveform line. We
546 always draw the clip/outline indicators.
549 if (_shape == WaveView::Rectified) {
551 for (int i = 0; i < n_peaks; ++i) {
555 if (tips[i].spread >= 1.0) {
556 wave_context->move_to (i, tips[i].top);
557 wave_context->line_to (i, tips[i].bot);
562 if (_global_show_waveform_clipping && (tips[i].clip_max || tips[i].clip_min)) {
563 clip_context->move_to (i, tips[i].top);
564 /* clip-indicating upper terminal line */
565 clip_context->rel_line_to (0, min (clip_height, ceil(tips[i].spread + .5)));
567 outline_context->move_to (i, tips[i].top);
568 /* normal upper terminal dot */
569 outline_context->rel_line_to (0, -1.0);
573 wave_context->stroke ();
574 clip_context->stroke ();
575 outline_context->stroke ();
578 const int height_zero = floor( _height * .5);
580 for (int i = 0; i < n_peaks; ++i) {
584 if (tips[i].spread >= 2.0) {
585 wave_context->move_to (i, tips[i].top);
586 wave_context->line_to (i, tips[i].bot);
589 /* draw square waves and other discontiguous points clearly */
591 if (tips[i-1].top + 2 < tips[i].top) {
592 wave_context->move_to (i-1, tips[i-1].top);
593 wave_context->line_to (i-1, (tips[i].bot + tips[i-1].top)/2);
594 wave_context->move_to (i, (tips[i].bot + tips[i-1].top)/2);
595 wave_context->line_to (i, tips[i].top);
596 } else if (tips[i-1].bot > tips[i].bot + 2) {
597 wave_context->move_to (i-1, tips[i-1].bot);
598 wave_context->line_to (i-1, (tips[i].top + tips[i-1].bot)/2);
599 wave_context->move_to (i, (tips[i].top + tips[i-1].bot)/2);
600 wave_context->line_to (i, tips[i].bot);
604 /* zero line, show only if there is enough spread
605 or the waveform line does not cross zero line */
607 if (show_zero_line() && ((tips[i].spread >= 5.0) || (tips[i].top > height_zero ) || (tips[i].bot < height_zero)) ) {
608 zero_context->move_to (i, height_zero);
609 zero_context->rel_line_to (1.0, 0);
612 if (tips[i].spread > 1.0) {
613 bool clipped = false;
614 /* outline/clip indicators */
615 if (_global_show_waveform_clipping && tips[i].clip_max) {
616 clip_context->move_to (i, tips[i].top);
617 /* clip-indicating upper terminal line */
618 clip_context->rel_line_to (0, min (clip_height, ceil(tips[i].spread + 0.5)));
622 if (_global_show_waveform_clipping && tips[i].clip_min) {
623 clip_context->move_to (i, tips[i].bot);
624 /* clip-indicating lower terminal line */
625 clip_context->rel_line_to (0, - min (clip_height, ceil(tips[i].spread + 0.5)));
629 if (!clipped && tips[i].spread > 2.0) {
630 /* only draw the outline if the spread
631 implies 3 or more pixels (so that we see 1
632 white pixel in the middle).
634 outline_context->move_to (i, tips[i].bot);
635 /* normal lower terminal dot; line moves up */
636 outline_context->rel_line_to (0, -1.0);
638 outline_context->move_to (i, tips[i].top);
639 /* normal upper terminal dot, line moves down */
640 outline_context->rel_line_to (0, 1.0);
643 bool clipped = false;
644 /* outline/clip indicator */
645 if (_global_show_waveform_clipping && (tips[i].clip_max || tips[i].clip_min)) {
646 clip_context->move_to (i, tips[i].top);
647 /* clip-indicating upper / lower terminal line */
648 clip_context->rel_line_to (0, 1.0);
653 /* special case where only 1 pixel of
654 * the waveform line is drawn (and
657 * we draw a 1px "line", pretending
658 * that the span is 1.0 (whether it is
661 wave_context->move_to (i, tips[i].top);
662 wave_context->rel_line_to (0, 1.0);
667 wave_context->stroke ();
668 outline_context->stroke ();
669 clip_context->stroke ();
670 zero_context->stroke ();
673 if (req->should_stop()) {
677 Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
679 /* Here we set a source colour and use the various components as a mask. */
681 if (gradient_depth() != 0.0) {
683 Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _height));
689 if (_shape == Rectified) {
699 color_to_rgba (_fill_color, r, g, b, a);
700 gradient->add_color_stop_rgba (stops[1], r, g, b, a);
701 /* generate a new color for the middle of the gradient */
703 color_to_hsv (_fill_color, h, s, v);
704 /* change v towards white */
705 v *= 1.0 - gradient_depth();
706 Color center = hsva_to_color (h, s, v, a);
707 color_to_rgba (center, r, g, b, a);
709 gradient->add_color_stop_rgba (stops[0], r, g, b, a);
710 gradient->add_color_stop_rgba (stops[2], r, g, b, a);
712 context->set_source (gradient);
714 set_source_rgba (context, _fill_color);
717 if (req->should_stop()) {
721 context->mask (images.wave, 0, 0);
724 set_source_rgba (context, _outline_color);
725 context->mask (images.outline, 0, 0);
728 set_source_rgba (context, _clip_color);
729 context->mask (images.clip, 0, 0);
732 set_source_rgba (context, _zero_color);
733 context->mask (images.zero, 0, 0);
737 boost::shared_ptr<WaveViewCache::Entry>
738 WaveView::cache_request_result (boost::shared_ptr<WaveViewThreadRequest> req) const
741 boost::shared_ptr<WaveViewCache::Entry> ret (new WaveViewCache::Entry (req->channel,
745 req->samples_per_pixel,
749 images->add (_region->audio_source (_channel), ret);
751 /* consolidate cache first (removes fully-contained
755 images->consolidate_image_cache (_region->audio_source (_channel),
756 req->channel, req->height, req->amplitude,
757 req->fill_color, req->samples_per_pixel);
762 boost::shared_ptr<WaveViewCache::Entry>
763 WaveView::get_image (framepos_t start, framepos_t end, bool& full_image) const
765 boost::shared_ptr<WaveViewCache::Entry> ret;
769 /* this is called from a ::render() call, when we need an image to
773 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 needs image from %2 .. %3\n", name, start, end));
777 Glib::Threads::Mutex::Lock lmq (request_queue_lock);
779 /* if there's a draw request outstanding, check to see if we
780 * have an image there. if so, use it (and put it in the cache
784 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 CR %2 stop? %3 image %4\n", this, current_request,
785 (current_request ? current_request->should_stop() : false),
786 (current_request ? current_request->image : 0)));
788 if (current_request && !current_request->should_stop() && current_request->image) {
790 /* put the image into the cache so that other
791 * WaveViews can use it if it is useful
794 if (current_request->start <= start && current_request->end >= end) {
796 ret.reset (new WaveViewCache::Entry (current_request->channel,
797 current_request->height,
798 current_request->amplitude,
799 current_request->fill_color,
800 current_request->samples_per_pixel,
801 current_request->start,
802 current_request->end,
803 current_request->image));
805 cache_request_result (current_request);
806 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1: got image from completed request, spans %2..%3\n",
807 name, current_request->start, current_request->end));
810 /* drop our handle on the current request */
811 current_request.reset ();
817 /* no current image draw request, so look in the cache */
819 ret = get_image_from_cache (start, end, full_image);
820 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1: lookup from cache gave %2 (full %3)\n",
821 name, ret, full_image));
827 if (!ret || !full_image) {
829 if ((rendered && get_image_in_thread) || always_get_image_in_thread) {
831 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1: generating image in caller thread\n", name));
833 boost::shared_ptr<WaveViewThreadRequest> req (new WaveViewThreadRequest);
835 req->type = WaveViewThreadRequest::Draw;
838 req->samples_per_pixel = _samples_per_pixel;
839 req->region = _region; /* weak ptr, to avoid storing a reference in the request queue */
840 req->channel = _channel;
841 req->height = _height;
842 req->fill_color = _fill_color;
843 req->amplitude = _region_amplitude * _amplitude_above_axis;
844 req->width = desired_image_width ();
846 /* draw image in this (the GUI thread) */
848 generate_image (req, false);
850 /* cache the result */
852 ret = cache_request_result (req);
854 /* reset this so that future missing images are
855 * generated in a a worker thread.
858 get_image_in_thread = false;
861 queue_get_image (_region, start, end);
866 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 got an image from %2 .. %3 (full ? %4)\n", name, ret->start, ret->end, full_image));
868 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 no useful image available\n", name));
874 boost::shared_ptr<WaveViewCache::Entry>
875 WaveView::get_image_from_cache (framepos_t start, framepos_t end, bool& full) const
878 return boost::shared_ptr<WaveViewCache::Entry>();
881 return images->lookup_image (_region->audio_source (_channel), start, end, _channel,
882 _height, _region_amplitude * _amplitude_above_axis, _fill_color, _samples_per_pixel, full);
886 WaveView::desired_image_width () const
888 /* compute how wide the image should be, in samples.
890 * We want at least 1 canvas width's worth, but if that
891 * represents less than 1/10th of a second, use 1/10th of
895 framecnt_t canvas_width_samples = _canvas->visible_area().width() * _samples_per_pixel;
896 const framecnt_t one_tenth_of_second = _region->session().frame_rate() / 10;
898 if (canvas_width_samples > one_tenth_of_second) {
899 return canvas_width_samples;
902 return one_tenth_of_second;
906 WaveView::queue_get_image (boost::shared_ptr<const ARDOUR::Region> region, framepos_t start, framepos_t end) const
908 boost::shared_ptr<WaveViewThreadRequest> req (new WaveViewThreadRequest);
910 req->type = WaveViewThreadRequest::Draw;
913 req->samples_per_pixel = _samples_per_pixel;
914 req->region = _region; /* weak ptr, to avoid storing a reference in the request queue */
915 req->channel = _channel;
916 req->height = _height;
917 req->fill_color = _fill_color;
918 req->amplitude = _region_amplitude * _amplitude_above_axis;
919 req->width = desired_image_width ();
921 if (current_request) {
922 /* this will stop rendering in progress (which might otherwise
923 be long lived) for any current request.
925 current_request->cancel ();
928 start_drawing_thread ();
930 /* swap requests (protected by lock) */
933 Glib::Threads::Mutex::Lock lm (request_queue_lock);
934 current_request = req;
936 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 now has current request %2\n", this, req));
938 if (request_queue.insert (this).second) {
939 /* this waveview was not already in the request queue, make sure we wake
940 the rendering thread in case it is asleep.
942 request_cond.signal ();
948 WaveView::generate_image (boost::shared_ptr<WaveViewThreadRequest> req, bool in_render_thread) const
950 if (!req->should_stop()) {
952 /* sample position is canonical here, and we want to generate
953 * an image that spans about 3x the canvas width. We get to that
954 * width by using an image sample count of the screen width added
955 * on each side of the desired image center.
958 const framepos_t center = req->start + ((req->end - req->start) / 2);
959 const framecnt_t image_samples = req->width;
961 /* we can request data from anywhere in the Source, between 0 and its length
964 framepos_t sample_start = max (_region_start, (center - image_samples));
965 framepos_t sample_end = min (center + image_samples, region_end());
966 const int n_peaks = llrintf ((sample_end - sample_start)/ (req->samples_per_pixel));
968 boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
970 /* Note that Region::read_peaks() takes a start position based on an
971 offset into the Region's **SOURCE**, rather than an offset into
975 framecnt_t peaks_read = _region->read_peaks (peaks.get(), n_peaks,
976 sample_start, sample_end - sample_start,
978 req->samples_per_pixel);
980 req->image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, req->height);
981 /* make sure we record the sample positions that were actually used */
982 req->start = sample_start;
983 req->end = sample_end;
985 if (peaks_read > 0) {
987 /* region amplitude will have been used to generate the
988 * peak values already, but not the visual-only
989 * amplitude_above_axis. So apply that here before
993 if (_amplitude_above_axis != 1.0) {
994 for (framecnt_t i = 0; i < n_peaks; ++i) {
995 peaks[i].max *= _amplitude_above_axis;
996 peaks[i].min *= _amplitude_above_axis;
1000 draw_image (req->image, peaks.get(), n_peaks, req);
1002 draw_absent_image (req->image, peaks.get(), n_peaks);
1006 if (in_render_thread && !req->should_stop()) {
1007 DEBUG_TRACE (DEBUG::WaveView, string_compose ("done with request for %1 at %2 CR %3 req %4 range %5 .. %6\n", this, g_get_monotonic_time(), current_request, req, req->start, req->end));
1008 const_cast<WaveView*>(this)->ImageReady (); /* emit signal */
1014 /** Given a waveform that starts at window x-coordinate @param wave_origin
1015 * and the first pixel that we will actually draw @param draw_start, return
1016 * the offset into an image of the entire waveform that we will need to use.
1018 * Note: most of our cached images are NOT of the entire waveform, this is just
1019 * computationally useful when determining which the sample range span for
1020 * the image we need.
1022 static inline double
1023 window_to_image (double wave_origin, double image_start)
1025 return image_start - wave_origin;
1029 WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
1031 assert (_samples_per_pixel != 0);
1037 DEBUG_TRACE (DEBUG::WaveView, string_compose ("render %1 at %2\n", this, g_get_monotonic_time()));
1039 /* a WaveView is intimately connected to an AudioRegion. It will
1040 * display the waveform within the region, anywhere from the start of
1041 * the region to its end.
1043 * the area we've been aked to render may overlap with area covered
1044 * by the region in any of the normal ways:
1046 * - it may begin and end within the area covered by the region
1047 * - it may start before and end after the area covered by region
1048 * - it may start before and end within the area covered by the region
1049 * - it may start within and end after the area covered by the region
1050 * - it may be precisely coincident with the area covered by region.
1052 * So let's start by determining the area covered by the region, in
1053 * window coordinates. It begins at zero (in item coordinates for this
1054 * waveview, and extends to region_length() / _samples_per_pixel.
1057 Rect self = item_to_window (Rect (0.0, 0.0, region_length() / _samples_per_pixel, _height));
1059 // cerr << name << " RENDER " << area << " self = " << self << endl;
1061 /* Now lets get the intersection with the area we've been asked to draw */
1063 boost::optional<Rect> d = self.intersection (area);
1069 Rect draw = d.get();
1071 /* "draw" is now a rectangle that defines the rectangle we need to
1072 * update/render the waveview into, in window coordinate space.
1075 /* window coordinates - pixels where x=0 is the left edge of the canvas
1076 * window. We round down in case we were asked to
1077 * draw "between" pixels at the start and/or end.
1080 double draw_start = floor (draw.x0);
1081 const double draw_end = floor (draw.x1);
1083 // cerr << "Need to draw " << draw_start << " .. " << draw_end << " vs. " << area << " and self = " << self << endl;
1085 /* image coordnates: pixels where x=0 is the start of this waveview,
1086 * wherever it may be positioned. thus image_start=N means "an image
1087 * that begins N pixels after the start of region that this waveview is
1091 const framepos_t image_start = window_to_image (self.x0, draw_start);
1092 const framepos_t image_end = window_to_image (self.x0, draw_end);
1094 // cerr << "Image/WV space: " << image_start << " .. " << image_end << endl;
1096 /* sample coordinates - note, these are not subject to rounding error
1098 * "sample_start = N" means "the first sample we need to represent is N
1099 * samples after the first sample of the region"
1102 framepos_t sample_start = _region_start + (image_start * _samples_per_pixel);
1103 framepos_t sample_end = _region_start + (image_end * _samples_per_pixel);
1105 // cerr << "Sample space: " << sample_start << " .. " << sample_end << " @ " << _samples_per_pixel << " rs = " << _region_start << endl;
1107 /* sample_start and sample_end are bounded by the region
1108 * limits. sample_start, because of the was just computed, must already
1109 * be greater than or equal to the _region_start value.
1112 sample_end = min (region_end(), sample_end);
1114 // cerr << debug_name() << " will need image spanning " << sample_start << " .. " << sample_end << " region spans " << _region_start << " .. " << region_end() << endl;
1116 double image_origin_in_self_coordinates;
1117 boost::shared_ptr<WaveViewCache::Entry> image_to_draw;
1119 if (_current_image) {
1121 /* check it covers the right sample range */
1123 if (_current_image->start > sample_start || _current_image->end < sample_end) {
1124 /* doesn't cover the area we need ... reset */
1125 _current_image.reset ();
1127 /* timestamp our continuing use of this image/cache entry */
1128 images->use (_region->audio_source (_channel), _current_image);
1129 image_to_draw = _current_image;
1133 if (!image_to_draw) {
1138 image_to_draw = get_image (sample_start, sample_end, full_image);
1140 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 image to draw = %2 (full? %3)\n", name, image_to_draw, full_image));
1142 if (!image_to_draw) {
1143 /* image not currently available. A redraw will be scheduled
1150 /* found an image that covers our entire sample range,
1151 * so keep a reference to it.
1153 _current_image = image_to_draw;
1157 /* compute the first pixel of the image that should be used when we
1158 * render the specified range.
1161 image_origin_in_self_coordinates = (image_to_draw->start - _region_start) / _samples_per_pixel;
1163 if (_start_shift && (sample_start == _region_start) && (self.x0 == draw.x0)) {
1164 /* we are going to draw the first pixel for this region, but
1165 we may not want this to overlap a border around the
1166 waveform. If so, _start_shift will be set.
1168 //cerr << name.substr (23) << " ss = " << sample_start << " rs = " << _region_start << " sf = " << _start_shift << " ds = " << draw_start << " self = " << self << " draw = " << draw << endl;
1169 //draw_start += _start_shift;
1170 //image_origin_in_self_coordinates += _start_shift;
1173 /* the image may only be a best-effort ... it may not span the entire
1174 * range requested, though it is guaranteed to cover the start. So
1175 * determine how many pixels we can actually draw.
1180 if (image_to_draw != _current_image) {
1182 /* the image is guaranteed to start at or before
1183 * draw_start. But if it starts before draw_start, that reduces
1184 * the maximum available width we can render with.
1186 * so .. clamp the draw width to the smaller of what we need to
1187 * draw or the available width of the image.
1190 draw_width = min ((double) image_to_draw->image->get_width() - (draw_start - image_to_draw->start),
1191 (draw_end - draw_start));
1194 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 draw just %2 of %3 (iwidth %4 off %5 img @ %6 rs @ %7)\n", name, draw_width, (draw_end - draw_start),
1195 image_to_draw->image->get_width(), image_origin_in_self_coordinates,
1196 image_to_draw->start, _region_start));
1198 draw_width = draw_end - draw_start;
1199 DEBUG_TRACE (DEBUG::WaveView, string_compose ("use current image, span entire render width %1..%2\n", draw_start, draw_end));
1202 context->rectangle (draw_start, draw.y0, draw_width, draw.height());
1204 /* round image origin position to an exact pixel in device space to
1208 double x = self.x0 + image_origin_in_self_coordinates;
1210 context->user_to_device (x, y);
1213 context->device_to_user (x, y);
1215 /* the coordinates specify where in "user coordinates" (i.e. what we
1216 * generally call "canvas coordinates" in this code) the image origin
1217 * will appear. So specifying (10,10) will put the upper left corner of
1218 * the image at (10,10) in user space.
1221 context->set_source (image_to_draw->image, x, y);
1224 /* image obtained, some of it painted to display: we are rendered.
1225 Future calls to get_image_in_thread are now meaningful.
1232 WaveView::compute_bounding_box () const
1235 _bounding_box = Rect (0.0, 0.0, region_length() / _samples_per_pixel, _height);
1237 _bounding_box = boost::optional<Rect> ();
1240 _bounding_box_dirty = false;
1244 WaveView::set_height (Distance height)
1246 if (height != _height) {
1249 invalidate_image_cache ();
1251 get_image_in_thread = true;
1253 _bounding_box_dirty = true;
1259 WaveView::set_channel (int channel)
1261 if (channel != _channel) {
1264 invalidate_image_cache ();
1267 _bounding_box_dirty = true;
1273 WaveView::set_logscaled (bool yn)
1275 if (_logscaled != yn) {
1276 begin_visual_change ();
1277 invalidate_image_cache ();
1279 end_visual_change ();
1284 WaveView::gain_changed ()
1286 begin_visual_change ();
1287 invalidate_image_cache ();
1288 _region_amplitude = _region->scale_amplitude ();
1289 get_image_in_thread = true;
1290 end_visual_change ();
1294 WaveView::set_zero_color (Color c)
1296 if (_zero_color != c) {
1297 begin_visual_change ();
1298 invalidate_image_cache ();
1300 end_visual_change ();
1305 WaveView::set_clip_color (Color c)
1307 if (_clip_color != c) {
1308 begin_visual_change ();
1309 invalidate_image_cache ();
1311 end_visual_change ();
1316 WaveView::set_show_zero_line (bool yn)
1318 if (_show_zero != yn) {
1319 begin_visual_change ();
1320 invalidate_image_cache ();
1322 end_visual_change ();
1327 WaveView::set_shape (Shape s)
1330 begin_visual_change ();
1331 invalidate_image_cache ();
1333 end_visual_change ();
1338 WaveView::set_amplitude_above_axis (double a)
1340 if (fabs (_amplitude_above_axis - a) > 0.01) {
1341 begin_visual_change ();
1342 invalidate_image_cache ();
1343 _amplitude_above_axis = a;
1344 get_image_in_thread = true;
1345 end_visual_change ();
1350 WaveView::set_global_shape (Shape s)
1352 if (_global_shape != s) {
1355 images->clear_cache ();
1357 VisualPropertiesChanged (); /* EMIT SIGNAL */
1362 WaveView::set_global_logscaled (bool yn)
1364 if (_global_logscaled != yn) {
1365 _global_logscaled = yn;
1367 images->clear_cache ();
1369 VisualPropertiesChanged (); /* EMIT SIGNAL */
1374 WaveView::region_length() const
1376 return _region->length() - (_region_start - _region->start());
1380 WaveView::region_end() const
1382 return _region_start + region_length();
1386 WaveView::set_region_start (frameoffset_t start)
1392 if (_region_start == start) {
1397 _region_start = start;
1398 _bounding_box_dirty = true;
1403 WaveView::region_resized ()
1405 /* Called when the region start or end (thus length) has changed.
1413 _region_start = _region->start();
1414 _bounding_box_dirty = true;
1419 WaveView::set_global_gradient_depth (double depth)
1421 if (_global_gradient_depth != depth) {
1422 _global_gradient_depth = depth;
1423 VisualPropertiesChanged (); /* EMIT SIGNAL */
1428 WaveView::set_global_show_waveform_clipping (bool yn)
1430 if (_global_show_waveform_clipping != yn) {
1431 _global_show_waveform_clipping = yn;
1432 ClipLevelChanged ();
1437 WaveView::set_start_shift (double pixels)
1443 begin_visual_change ();
1444 _start_shift = pixels;
1445 end_visual_change ();
1449 WaveView::cancel_my_render_request () const
1455 /* try to stop any current rendering of the request, or prevent it from
1459 if (current_request) {
1460 current_request->cancel ();
1463 Glib::Threads::Mutex::Lock lm (request_queue_lock);
1465 /* now remove it from the queue and reset our request pointer so that
1466 have no outstanding request (that we know about)
1469 request_queue.erase (this);
1470 current_request.reset ();
1471 DEBUG_TRACE (DEBUG::WaveView, string_compose ("%1 now has no request %2\n", this));
1476 WaveView::set_image_cache_size (uint64_t sz)
1479 images = new WaveViewCache;
1482 images->set_image_cache_threshold (sz);
1485 /*-------------------------------------------------*/
1488 WaveView::start_drawing_thread ()
1490 if (!_drawing_thread) {
1491 _drawing_thread = Glib::Threads::Thread::create (sigc::ptr_fun (WaveView::drawing_thread));
1496 WaveView::stop_drawing_thread ()
1498 if (_drawing_thread) {
1499 Glib::Threads::Mutex::Lock lm (request_queue_lock);
1500 g_atomic_int_set (&drawing_thread_should_quit, 1);
1501 request_cond.signal ();
1506 WaveView::drawing_thread ()
1508 using namespace Glib::Threads;
1510 WaveView const * requestor;
1511 Mutex::Lock lm (request_queue_lock);
1516 /* remember that we hold the lock at this point, no matter what */
1518 if (g_atomic_int_get (&drawing_thread_should_quit)) {
1522 if (request_queue.empty()) {
1523 request_cond.wait (request_queue_lock);
1526 /* remove the request from the queue (remember: the "request"
1527 * is just a pointer to a WaveView object)
1530 requestor = *(request_queue.begin());
1531 request_queue.erase (request_queue.begin());
1533 DEBUG_TRACE (DEBUG::WaveView, string_compose ("start request for %1 at %2\n", requestor, g_get_monotonic_time()));
1535 boost::shared_ptr<WaveViewThreadRequest> req = requestor->current_request;
1541 /* Generate an image. Unlock the request queue lock
1542 * while we do this, so that other things can happen
1543 * as we do rendering.
1546 request_queue_lock.unlock (); /* some RAII would be good here */
1549 requestor->generate_image (req, true);
1551 req->image.clear(); /* just in case it was set before the exception, whatever it was */
1554 request_queue_lock.lock ();
1556 req.reset (); /* drop/delete request as appropriate */
1559 /* thread is vanishing */
1560 _drawing_thread = 0;
1563 /*-------------------------------------------------*/
1565 WaveViewCache::WaveViewCache ()
1566 : image_cache_size (0)
1567 , _image_cache_threshold (100 * 1048576) /* bytes */
1571 WaveViewCache::~WaveViewCache ()
1576 boost::shared_ptr<WaveViewCache::Entry>
1577 WaveViewCache::lookup_image (boost::shared_ptr<ARDOUR::AudioSource> src,
1578 framepos_t start, framepos_t end,
1583 double samples_per_pixel,
1584 bool& full_coverage)
1586 ImageCache::iterator x;
1588 if ((x = cache_map.find (src)) == cache_map.end ()) {
1589 /* nothing in the cache for this audio source at all */
1590 return boost::shared_ptr<WaveViewCache::Entry> ();
1593 CacheLine& caches = x->second;
1594 boost::shared_ptr<Entry> best_partial;
1595 framecnt_t max_coverage = 0;
1597 /* Find a suitable ImageSurface, if it exists.
1600 for (CacheLine::iterator c = caches.begin(); c != caches.end(); ++c) {
1602 boost::shared_ptr<Entry> e (*c);
1604 if (channel != e->channel
1605 || height != e->height
1606 || amplitude != e->amplitude
1607 || samples_per_pixel != e->samples_per_pixel
1608 || fill_color != e->fill_color) {
1612 switch (Evoral::coverage (start, end, e->start, e->end)) {
1613 case Evoral::OverlapExternal: /* required range is inside image range */
1614 DEBUG_TRACE (DEBUG::WaveView, string_compose ("found image spanning %1..%2 covers %3..%4\n",
1615 e->start, e->end, start, end));
1617 full_coverage = true;
1620 case Evoral::OverlapStart: /* required range start is covered by image range */
1621 if ((e->end - start) > max_coverage) {
1623 max_coverage = e->end - start;
1627 case Evoral::OverlapNone:
1628 case Evoral::OverlapEnd:
1629 case Evoral::OverlapInternal:
1635 DEBUG_TRACE (DEBUG::WaveView, string_compose ("found PARTIAL image spanning %1..%2 partially covers %3..%4\n",
1636 best_partial->start, best_partial->end, start, end));
1637 use (src, best_partial);
1638 full_coverage = false;
1639 return best_partial;
1642 return boost::shared_ptr<Entry> ();
1646 WaveViewCache::consolidate_image_cache (boost::shared_ptr<ARDOUR::AudioSource> src,
1651 double samples_per_pixel)
1653 list <uint32_t> deletion_list;
1654 uint32_t other_entries = 0;
1655 ImageCache::iterator x;
1657 /* MUST BE CALLED FROM (SINGLE) GUI THREAD */
1659 if ((x = cache_map.find (src)) == cache_map.end ()) {
1663 CacheLine& caches = x->second;
1665 for (CacheLine::iterator c1 = caches.begin(); c1 != caches.end(); ) {
1667 CacheLine::iterator nxt = c1;
1670 boost::shared_ptr<Entry> e1 (*c1);
1672 if (channel != e1->channel
1673 || height != e1->height
1674 || amplitude != e1->amplitude
1675 || samples_per_pixel != e1->samples_per_pixel
1676 || fill_color != e1->fill_color) {
1678 /* doesn't match current properties, ignore and move on
1687 /* c1 now points to a cached image entry that matches current
1688 * properties. Check all subsequent cached imaged entries to
1689 * see if there are others that also match but represent
1690 * subsets of the range covered by this one.
1693 for (CacheLine::iterator c2 = c1; c2 != caches.end(); ) {
1695 CacheLine::iterator nxt2 = c2;
1698 boost::shared_ptr<Entry> e2 (*c2);
1700 if (e1 == e2 || channel != e2->channel
1701 || height != e2->height
1702 || amplitude != e2->amplitude
1703 || samples_per_pixel != e2->samples_per_pixel
1704 || fill_color != e2->fill_color) {
1706 /* properties do not match, ignore for the
1707 * purposes of consolidation.
1713 if (e2->start >= e1->start && e2->end <= e1->end) {
1714 /* c2 is fully contained by c1, so delete it */
1717 /* and re-start the whole iteration */
1718 nxt = caches.begin ();
1730 WaveViewCache::use (boost::shared_ptr<ARDOUR::AudioSource> src, boost::shared_ptr<Entry> ce)
1732 ce->timestamp = g_get_monotonic_time ();
1736 WaveViewCache::add (boost::shared_ptr<ARDOUR::AudioSource> src, boost::shared_ptr<Entry> ce)
1738 /* MUST BE CALLED FROM (SINGLE) GUI THREAD */
1740 Cairo::RefPtr<Cairo::ImageSurface> img (ce->image);
1742 image_cache_size += img->get_height() * img->get_width () * 4; /* 4 = bytes per FORMAT_ARGB32 pixel */
1748 ce->timestamp = g_get_monotonic_time ();
1750 cache_map[src].push_back (ce);
1754 WaveViewCache::compute_image_cache_size()
1757 for (ImageCache::iterator s = cache_map.begin(); s != cache_map.end(); ++s) {
1758 CacheLine& per_source_cache (s->second);
1759 for (CacheLine::iterator c = per_source_cache.begin(); c != per_source_cache.end(); ++c) {
1760 Cairo::RefPtr<Cairo::ImageSurface> img ((*c)->image);
1761 total += img->get_height() * img->get_width() * 4; /* 4 = bytes per FORMAT_ARGB32 pixel */
1768 WaveViewCache::cache_full()
1770 return image_cache_size > _image_cache_threshold;
1774 WaveViewCache::cache_flush ()
1776 /* Build a sortable list of all cache entries */
1778 CacheList cache_list;
1780 for (ImageCache::const_iterator cm = cache_map.begin(); cm != cache_map.end(); ++cm) {
1781 for (CacheLine::const_iterator cl = cm->second.begin(); cl != cm->second.end(); ++cl) {
1782 cache_list.push_back (make_pair (cm->first, *cl));
1786 /* sort list in LRU order */
1787 SortByTimestamp sorter;
1788 sort (cache_list.begin(), cache_list.end(), sorter);
1790 while (image_cache_size > _image_cache_threshold && !cache_map.empty() && !cache_list.empty()) {
1792 ListEntry& le (cache_list.front());
1794 ImageCache::iterator x;
1796 if ((x = cache_map.find (le.first)) != cache_map.end ()) {
1798 CacheLine& cl = x->second;
1800 for (CacheLine::iterator c = cl.begin(); c != cl.end(); ++c) {
1802 if (*c == le.second) {
1804 DEBUG_TRACE (DEBUG::WaveView, string_compose ("Removing cache line entry for %1\n", x->first->name()));
1806 /* Remove this entry from this cache line */
1810 /* remove cache line from main cache: no more entries */
1811 cache_map.erase (x);
1818 Cairo::RefPtr<Cairo::ImageSurface> img (le.second->image);
1819 uint64_t size = img->get_height() * img->get_width() * 4; /* 4 = bytes per FORMAT_ARGB32 pixel */
1821 if (image_cache_size > size) {
1822 image_cache_size -= size;
1824 image_cache_size = 0;
1826 DEBUG_TRACE (DEBUG::WaveView, string_compose ("cache shrunk to %1\n", image_cache_size));
1829 /* Remove from the linear list, even if we didn't find it in
1830 * the actual cache_mao
1832 cache_list.erase (cache_list.begin());
1837 WaveViewCache::clear_cache ()
1839 DEBUG_TRACE (DEBUG::WaveView, "clear cache\n");
1840 const uint64_t image_cache_threshold = _image_cache_threshold;
1841 _image_cache_threshold = 0;
1843 _image_cache_threshold = image_cache_threshold;
1847 WaveViewCache::set_image_cache_threshold (uint64_t sz)
1849 DEBUG_TRACE (DEBUG::WaveView, string_compose ("new image cache size %1\n", sz));
1850 _image_cache_threshold = sz;