2 Copyright (C) 2011-2013 Paul Davis
3 Author: Carl Hetherington <cth@carlh.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <cairomm/cairomm.h>
24 #include "gtkmm2ext/utils.h"
26 #include "pbd/compose.h"
27 #include "pbd/signals.h"
28 #include "pbd/stacktrace.h"
30 #include "ardour/types.h"
31 #include "ardour/dB.h"
32 #include "ardour/audioregion.h"
34 #include "canvas/wave_view.h"
35 #include "canvas/utils.h"
36 #include "canvas/canvas.h"
38 #include <gdkmm/general.h>
41 using namespace ARDOUR;
42 using namespace ArdourCanvas;
44 double WaveView::_global_gradient_depth = 0.6;
45 bool WaveView::_global_logscaled = false;
46 WaveView::Shape WaveView::_global_shape = WaveView::Normal;
48 PBD::Signal0<void> WaveView::VisualPropertiesChanged;
50 WaveView::WaveView (Group* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
56 , _samples_per_pixel (0)
58 , _wave_color (0xffffffff)
60 , _zero_color (0xff0000ff)
61 , _clip_color (0xff0000ff)
62 , _logscaled (_global_logscaled)
63 , _shape (_global_shape)
64 , _gradient_depth (_global_gradient_depth)
65 , _shape_independent (false)
66 , _logscaled_independent (false)
67 , _gradient_depth_independent (false)
68 , _amplitude_above_axis (1.0)
69 , _region_start (region->start())
73 VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
76 WaveView::~WaveView ()
81 WaveView::handle_visual_property_change ()
85 if (!_shape_independent && (_shape != global_shape())) {
86 _shape = global_shape();
90 if (!_logscaled_independent && (_logscaled != global_logscaled())) {
91 _logscaled = global_logscaled();
95 if (!_gradient_depth_independent && (_gradient_depth != global_gradient_depth())) {
96 _gradient_depth = global_gradient_depth();
106 WaveView::set_fill_color (Color c)
108 if (c != _fill_color) {
110 Fill::set_fill_color (c);
115 WaveView::set_outline_color (Color c)
117 if (c != _outline_color) {
119 Outline::set_outline_color (c);
124 WaveView::set_samples_per_pixel (double samples_per_pixel)
126 if (samples_per_pixel != _samples_per_pixel) {
129 _samples_per_pixel = samples_per_pixel;
131 _bounding_box_dirty = true;
140 image_to_window (double wave_origin, double image_start)
142 return wave_origin + image_start;
146 window_to_image (double wave_origin, double image_start)
148 return image_start - wave_origin;
152 _log_meter (float power, double lower_db, double upper_db, double non_linearity)
154 return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity));
158 alt_log_meter (float power)
160 return _log_meter (power, -192.0, 0.0, 8.0);
168 LineTips() : top (0.0), bot (0.0), clipped (false) {}
172 WaveView::draw_image (PeakData* _peaks, int n_peaks) const
174 _image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, _height);
176 Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (_image);
178 boost::scoped_array<LineTips> tips (new LineTips[n_peaks]);
180 if (_shape == WaveView::Rectified) {
182 /* each peak is a line from the bottom of the waveview
183 * to a point determined by max (_peaks[i].max,
188 for (int i = 0; i < n_peaks; ++i) {
189 tips[i].bot = height();
190 tips[i].top = position (alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min)))));
192 } else {for (int i = 0; i < n_peaks; ++i) {
193 tips[i].bot = height();
194 tips[i].top = position (max (fabs (_peaks[i].max), fabs (_peaks[i].min)));
201 for (int i = 0; i < n_peaks; ++i) {
202 Coord top = _peaks[i].min;
203 Coord bot = _peaks[i].max;
206 top = position (alt_log_meter (fast_coefficient_to_dB (top)));
207 } else if (top < 0.0) {
208 top = position (-alt_log_meter (fast_coefficient_to_dB (-top)));
210 top = position (0.0);
214 bot = position (alt_log_meter (fast_coefficient_to_dB (bot)));
215 } else if (bot < 0.0) {
216 bot = position (-alt_log_meter (fast_coefficient_to_dB (-bot)));
218 bot = position (0.0);
227 for (int i = 0; i < n_peaks; ++i) {
228 tips[i].top = position (_peaks[i].min);
229 tips[i].bot = position (_peaks[i].max);
234 if (gradient_depth() != 0.0) {
236 Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _height));
242 if (_shape == Rectified) {
252 color_to_rgba (_fill_color, r, g, b, a);
253 gradient->add_color_stop_rgba (stops[0], r, g, b, a);
254 gradient->add_color_stop_rgba (stops[2], r, g, b, a);
256 /* generate a new color for the middle of the gradient */
258 color_to_hsv (_fill_color, h, s, v);
259 /* change v towards white */
260 v *= 1.0 - gradient_depth();
261 Color center = hsv_to_color (h, s, v, a);
262 color_to_rgba (center, r, g, b, a);
263 gradient->add_color_stop_rgba (stops[1], r, g, b, a);
265 context->set_source (gradient);
267 set_source_rgba (context, _fill_color);
270 /* ensure single-pixel lines */
272 context->set_line_width (0.5);
273 context->translate (0.5, 0.0);
277 if (_shape == WaveView::Rectified) {
278 for (int i = 0; i < n_peaks; ++i) {
279 context->move_to (i, tips[i].top); /* down 1 pixel */
280 context->line_to (i, tips[i].bot);
284 for (int i = 0; i < n_peaks; ++i) {
285 context->move_to (i, tips[i].top);
286 context->line_to (i, tips[i].bot);
291 /* now add dots to the top and bottom of each line (this is
292 * modelled on pyramix, except that we add clipping indicators.
295 context->set_source_rgba (0, 0, 0, 1.0);
297 for (int i = 0; i < n_peaks; ++i) {
298 context->move_to (i, tips[i].top);
299 context->rel_line_to (0, 1.0);
301 if (_shape != WaveView::Rectified) {
302 context->move_to (i, tips[i].bot);
303 context->rel_line_to (0, -1.0);
308 if (show_zero_line()) {
309 set_source_rgba (context, _zero_color);
310 context->move_to (0, position (0.0));
311 context->line_to (n_peaks, position (0.0));
317 WaveView::ensure_cache (framepos_t start, framepos_t end) const
319 if (_image && _sample_start <= start && _sample_end >= end) {
320 /* cache already covers required range, do nothing */
324 /* sample position is canonical here, and we want to generate
325 * an image that spans about twice the canvas width
328 const framepos_t center = start + ((end - start) / 2);
329 const framecnt_t canvas_samples = 2 * (_canvas->visible_area().width() * _samples_per_pixel);
331 /* we can request data from anywhere in the Source, between 0 and its length
334 _sample_start = max ((framepos_t) 0, (center - canvas_samples));
335 _sample_end = min (center + canvas_samples, _region->source_length (0));
337 double pixel_start = floor (_sample_start / (double) _samples_per_pixel);
338 double pixel_end = ceil (_sample_end / (double) _samples_per_pixel);
339 int n_peaks = llrintf (pixel_end - pixel_start);
341 boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
343 _region->read_peaks (peaks.get(), n_peaks,
344 _sample_start, _sample_end - _sample_start,
348 draw_image (peaks.get(), n_peaks);
352 WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
354 assert (_samples_per_pixel != 0);
360 Rect self = item_to_window (Rect (0.0, 0.0, floor (_region->length() / _samples_per_pixel), _height));
361 boost::optional<Rect> d = self.intersection (area);
369 /* window coordinates - pixels where x=0 is the left edge of the canvas
370 * window. We round up and down in case we were asked to
371 * draw "between" pixels at the start and/or end.
374 const double draw_start = floor (draw.x0);
375 const double draw_end = ceil (draw.x1);
377 // cerr << "Need to draw " << draw_start << " .. " << draw_end << endl;
379 /* image coordnates: pixels where x=0 is the start of this waveview,
380 * wherever it may be positioned. thus image_start=N means "an image
381 * that beings N pixels after the start of region that this waveview is
385 const framepos_t image_start = window_to_image (self.x0, draw_start);
386 const framepos_t image_end = window_to_image (self.x0, draw_end);
388 // cerr << "Image/WV space: " << image_start << " .. " << image_end << endl;
390 /* sample coordinates - note, these are not subject to rounding error */
391 framepos_t sample_start = _region_start + (image_start * _samples_per_pixel);
392 framepos_t sample_end = _region_start + (image_end * _samples_per_pixel);
394 // cerr << "Sample space: " << sample_start << " .. " << sample_end << endl;
396 ensure_cache (sample_start, sample_end);
398 // cerr << "Cache contains " << _cache->pixel_start() << " .. " << _cache->pixel_end() << " / "
399 // << _cache->sample_start() << " .. " << _cache->sample_end()
402 double image_offset = (_sample_start - _region->start()) / _samples_per_pixel;
404 // cerr << "Offset into image to place at zero: " << image_offset << endl;
406 context->rectangle (draw_start, draw.y0, draw_end - draw_start, draw.height());
408 /* round image origin position to an exact pixel in device space to
412 double x = self.x0 + image_offset;
414 context->user_to_device (x, y);
417 context->device_to_user (x, y);
419 context->set_source (_image, x, y);
424 WaveView::compute_bounding_box () const
427 _bounding_box = Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height);
429 _bounding_box = boost::optional<Rect> ();
432 _bounding_box_dirty = false;
436 WaveView::set_height (Distance height)
438 if (height != _height) {
443 _bounding_box_dirty = true;
451 WaveView::set_channel (int channel)
453 if (channel != _channel) {
458 _bounding_box_dirty = true;
466 WaveView::invalidate_image ()
468 begin_visual_change ();
474 end_visual_change ();
479 WaveView::set_logscaled (bool yn)
481 if (_logscaled != yn) {
488 WaveView::gain_changed ()
494 WaveView::set_zero_color (Color c)
496 if (_zero_color != c) {
503 WaveView::set_clip_color (Color c)
505 if (_clip_color != c) {
512 WaveView::set_show_zero_line (bool yn)
514 if (_show_zero != yn) {
521 WaveView::set_shape (Shape s)
530 WaveView::set_amplitude_above_axis (double a)
532 if (_amplitude_above_axis != a) {
533 _amplitude_above_axis = a;
539 WaveView::set_global_shape (Shape s)
541 if (_global_shape != s) {
543 VisualPropertiesChanged (); /* EMIT SIGNAL */
548 WaveView::set_global_logscaled (bool yn)
550 if (_global_logscaled != yn) {
551 _global_logscaled = yn;
552 VisualPropertiesChanged (); /* EMIT SIGNAL */
557 WaveView::region_resized ()
563 /* special: do not use _region->length() here to compute
564 bounding box because it will already have changed.
566 if we have a bounding box, use it.
569 _pre_change_bounding_box = _bounding_box;
571 _bounding_box_dirty = true;
572 compute_bounding_box ();
578 WaveView::position (double s) const
580 /* it is important that this returns an integral value, so that we
581 can ensure correct single pixel behaviour.
586 return floor (_height - (s * _height));
590 return floor ((1.0-s) * (_height / 2.0));
594 WaveView::set_global_gradient_depth (double depth)
596 if (_global_gradient_depth != depth) {
597 _global_gradient_depth = depth;
598 VisualPropertiesChanged (); /* EMIT SIGNAL */