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.
21 #include <boost/shared_ptr.hpp>
22 #include <boost/shared_array.hpp>
23 #include <boost/scoped_array.hpp>
25 #include "pbd/properties.h"
27 #include "ardour/types.h"
29 #include <glibmm/refptr.h>
31 #include "canvas/visibility.h"
32 #include "canvas/item.h"
33 #include "canvas/fill.h"
34 #include "canvas/outline.h"
46 namespace ArdourCanvas {
48 class LIBCANVAS_API WaveView : virtual public Item, public Outline, public Fill
56 /* Displays a single channel of waveform data for the given Region.
58 x = 0 in the waveview corresponds to the first waveform datum taken
59 from region->start() samples into the source data.
61 x = N in the waveview corresponds to the (N * spp)'th sample
62 measured from region->start() into the source data.
64 when drawing, we will map the zeroth-pixel of the waveview
67 The waveview itself contains a set of pre-rendered Cairo::ImageSurfaces
68 that cache sections of the display. This is filled on-demand and
69 never cleared until something explicitly marks the cache invalid
70 (such as a change in samples_per_pixel, the log scaling, rectified or
71 other view parameters).
75 WaveView (Group *, boost::shared_ptr<ARDOUR::AudioRegion>);
78 void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
79 void compute_bounding_box () const;
81 void set_samples_per_pixel (double);
82 void set_height (Distance);
83 void set_channel (int);
84 void set_region_start (ARDOUR::frameoffset_t);
86 void set_fill_color (Color);
87 void set_outline_color (Color);
89 void region_resized ();
92 void set_show_zero_line (bool);
93 bool show_zero_line() const { return _show_zero; }
94 void set_zero_color (Color);
95 void set_clip_color (Color);
96 void set_logscaled (bool);
97 void set_gradient_depth (double);
98 double gradient_depth() const { return _gradient_depth; }
99 void set_shape (Shape);
101 /* currently missing because we don't need them (yet):
102 set_shape_independent();
103 set_logscaled_independent()
106 static void set_global_gradient_depth (double);
107 static void set_global_logscaled (bool);
108 static void set_global_shape (Shape);
109 static void set_global_show_waveform_clipping (bool);
111 static double global_gradient_depth() { return _global_gradient_depth; }
112 static bool global_logscaled() { return _global_logscaled; }
113 static Shape global_shape() { return _global_shape; }
115 void set_amplitude_above_axis (double v);
116 double amplitude_above_axis () const { return _amplitude_above_axis; }
118 static void set_clip_level (double dB);
119 static PBD::Signal0<void> ClipLevelChanged;
121 #ifdef CANVAS_COMPATIBILITY
122 void*& property_gain_src () {
125 void*& property_gain_function () {
133 friend class ::WaveViewTest;
135 void invalidate_image ();
137 boost::shared_ptr<ARDOUR::AudioRegion> _region;
139 double _samples_per_pixel;
146 double _gradient_depth;
147 bool _shape_independent;
148 bool _logscaled_independent;
149 bool _gradient_depth_independent;
150 double _amplitude_above_axis;
152 /** The `start' value to use for the region; we can't use the region's
153 * value as the crossfade editor needs to alter it.
155 ARDOUR::frameoffset_t _region_start;
158 mutable ARDOUR::framepos_t _sample_start;
159 mutable ARDOUR::framepos_t _sample_end;
160 mutable Cairo::RefPtr<Cairo::ImageSurface> _image;
162 PBD::ScopedConnectionList invalidation_connection;
164 static double _global_gradient_depth;
165 static bool _global_logscaled;
166 static Shape _global_shape;
167 static bool _global_show_waveform_clipping;
168 static double _clip_level;
170 static PBD::Signal0<void> VisualPropertiesChanged;
172 void handle_visual_property_change ();
173 void handle_clip_level_change ();
175 void ensure_cache (ARDOUR::framepos_t sample_start, ARDOUR::framepos_t sample_end) const;
176 ArdourCanvas::Coord position (double) const;
177 void draw_image (ARDOUR::PeakData*, int npeaks) const;