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livetrax/libs/canvas/wave_view.cc
Paul Davis 6019f06bdf different approach to independent scrolling, involving ArdourCanvas::ScrollGroup
The idea now is that a scroll group item can be added to the canvas which will causes its children to scroll in either or both
directions (horizontal or vertical). There are few complications: the position() of the ScrollGroup is ambiguous depending
on whether you want it with scroll taken into account or not, so Item::canvas_position() was added, which defaults to
the same value as Item::position() but is overridden by ScrollGroup to return the position independent of scrolling. This
method is used when translating between item/canvas/window coordinate systems.

Note that the basic idea is that we MOVE the scroll group when a scroll happens. This mirrors what happens in the GnomeCanvas,
where Nick Mainsbridge came up with a great idea that allowed unification of the time bar and track canvases.
2014-06-03 16:10:27 -04:00

709 lines
16 KiB
C++

/*
Copyright (C) 2011-2013 Paul Davis
Author: Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <cmath>
#include <cairomm/cairomm.h>
#include "gtkmm2ext/utils.h"
#include "pbd/compose.h"
#include "pbd/signals.h"
#include "pbd/stacktrace.h"
#include "ardour/types.h"
#include "ardour/dB.h"
#include "ardour/audioregion.h"
#include "canvas/wave_view.h"
#include "canvas/utils.h"
#include "canvas/canvas.h"
#include <gdkmm/general.h>
using namespace std;
using namespace ARDOUR;
using namespace ArdourCanvas;
double WaveView::_global_gradient_depth = 0.6;
bool WaveView::_global_logscaled = false;
WaveView::Shape WaveView::_global_shape = WaveView::Normal;
bool WaveView::_global_show_waveform_clipping = true;
double WaveView::_clip_level = 0.98853;
PBD::Signal0<void> WaveView::VisualPropertiesChanged;
PBD::Signal0<void> WaveView::ClipLevelChanged;
WaveView::WaveView (Group* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
: Item (parent)
, Outline (parent)
, Fill (parent)
, _region (region)
, _channel (0)
, _samples_per_pixel (0)
, _height (64)
, _show_zero (false)
, _zero_color (0xff0000ff)
, _clip_color (0xff0000ff)
, _logscaled (_global_logscaled)
, _shape (_global_shape)
, _gradient_depth (_global_gradient_depth)
, _shape_independent (false)
, _logscaled_independent (false)
, _gradient_depth_independent (false)
, _amplitude_above_axis (1.0)
, _region_start (region->start())
, _sample_start (-1)
, _sample_end (-1)
{
VisualPropertiesChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_visual_property_change, this));
ClipLevelChanged.connect_same_thread (invalidation_connection, boost::bind (&WaveView::handle_clip_level_change, this));
}
WaveView::~WaveView ()
{
}
void
WaveView::handle_visual_property_change ()
{
bool changed = false;
if (!_shape_independent && (_shape != global_shape())) {
_shape = global_shape();
changed = true;
}
if (!_logscaled_independent && (_logscaled != global_logscaled())) {
_logscaled = global_logscaled();
changed = true;
}
if (!_gradient_depth_independent && (_gradient_depth != global_gradient_depth())) {
_gradient_depth = global_gradient_depth();
changed = true;
}
if (changed) {
invalidate_image ();
}
}
void
WaveView::handle_clip_level_change ()
{
invalidate_image ();
}
void
WaveView::set_fill_color (Color c)
{
if (c != _fill_color) {
invalidate_image ();
Fill::set_fill_color (c);
}
}
void
WaveView::set_outline_color (Color c)
{
if (c != _outline_color) {
invalidate_image ();
Outline::set_outline_color (c);
}
}
void
WaveView::set_samples_per_pixel (double samples_per_pixel)
{
if (samples_per_pixel != _samples_per_pixel) {
begin_change ();
_samples_per_pixel = samples_per_pixel;
_bounding_box_dirty = true;
end_change ();
invalidate_image ();
}
}
static inline double
image_to_window (double wave_origin, double image_start)
{
return wave_origin + image_start;
}
static inline double
window_to_image (double wave_origin, double image_start)
{
return image_start - wave_origin;
}
static inline float
_log_meter (float power, double lower_db, double upper_db, double non_linearity)
{
return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity));
}
static inline float
alt_log_meter (float power)
{
return _log_meter (power, -192.0, 0.0, 8.0);
}
void
WaveView::set_clip_level (double dB)
{
const double clip_level = dB_to_coefficient (dB);
if (clip_level != _clip_level) {
_clip_level = clip_level;
ClipLevelChanged ();
}
}
struct LineTips {
double top;
double bot;
bool clip_max;
bool clip_min;
LineTips() : top (0.0), bot (0.0), clip_max (false), clip_min (false) {}
};
void
WaveView::draw_image (PeakData* _peaks, int n_peaks) const
{
_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, _height);
Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (_image);
boost::scoped_array<LineTips> tips (new LineTips[n_peaks]);
/* Clip level nominally set to -0.9dBFS to account for inter-sample
interpolation possibly clipping (value may be too low).
We adjust by the region's own gain (but note: not by any gain
automation or its gain envelope) so that clip indicators are closer
to providing data about on-disk data. This multiplication is
needed because the data we get from AudioRegion::read_peaks()
has been scaled by scale_amplitude() already.
*/
const double clip_level = _clip_level * _region->scale_amplitude();
if (_shape == WaveView::Rectified) {
/* each peak is a line from the bottom of the waveview
* to a point determined by max (_peaks[i].max,
* _peaks[i].min)
*/
if (_logscaled) {
for (int i = 0; i < n_peaks; ++i) {
tips[i].bot = height();
tips[i].top = y_extent (alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min)))));
if (fabs (_peaks[i].max) >= clip_level) {
tips[i].clip_max = true;
}
if (fabs (_peaks[i].min) >= clip_level) {
tips[i].clip_min = true;
}
}
} else {for (int i = 0; i < n_peaks; ++i) {
tips[i].bot = height();
tips[i].top = y_extent (max (fabs (_peaks[i].max), fabs (_peaks[i].min)));
if (fabs (_peaks[i].max) >= clip_level) {
tips[i].clip_max = true;
}
if (fabs (_peaks[i].min) >= clip_level) {
tips[i].clip_min = true;
}
}
}
} else {
if (_logscaled) {
for (int i = 0; i < n_peaks; ++i) {
Coord top = _peaks[i].min;
Coord bot = _peaks[i].max;
if (fabs (top) >= clip_level) {
tips[i].clip_max = true;
}
if (fabs (bot) >= clip_level) {
tips[i].clip_min = true;
}
if (top > 0.0) {
top = y_extent (alt_log_meter (fast_coefficient_to_dB (top)));
} else if (top < 0.0) {
top = y_extent (-alt_log_meter (fast_coefficient_to_dB (-top)));
} else {
top = y_extent (0.0);
}
if (bot > 0.0) {
bot = y_extent (alt_log_meter (fast_coefficient_to_dB (bot)));
} else if (bot < 0.0) {
bot = y_extent (-alt_log_meter (fast_coefficient_to_dB (-bot)));
} else {
bot = y_extent (0.0);
}
tips[i].top = top;
tips[i].bot = bot;
}
} else {
for (int i = 0; i < n_peaks; ++i) {
if (fabs (_peaks[i].max) >= clip_level) {
tips[i].clip_max = true;
}
if (fabs (_peaks[i].min) >= clip_level) {
tips[i].clip_min = true;
}
tips[i].top = y_extent (_peaks[i].min);
tips[i].bot = y_extent (_peaks[i].max);
}
}
}
if (gradient_depth() != 0.0) {
Cairo::RefPtr<Cairo::LinearGradient> gradient (Cairo::LinearGradient::create (0, 0, 0, _height));
double stops[3];
double r, g, b, a;
if (_shape == Rectified) {
stops[0] = 0.1;
stops[0] = 0.3;
stops[0] = 0.9;
} else {
stops[0] = 0.1;
stops[1] = 0.5;
stops[2] = 0.9;
}
color_to_rgba (_fill_color, r, g, b, a);
gradient->add_color_stop_rgba (stops[0], r, g, b, a);
gradient->add_color_stop_rgba (stops[2], r, g, b, a);
/* generate a new color for the middle of the gradient */
double h, s, v;
color_to_hsv (_fill_color, h, s, v);
/* change v towards white */
v *= 1.0 - gradient_depth();
Color center = hsv_to_color (h, s, v, a);
color_to_rgba (center, r, g, b, a);
gradient->add_color_stop_rgba (stops[1], r, g, b, a);
context->set_source (gradient);
} else {
set_source_rgba (context, _fill_color);
}
/* ensure single-pixel lines */
context->set_line_width (0.5);
context->translate (0.5, 0.0);
/* draw the lines */
if (_shape == WaveView::Rectified) {
for (int i = 0; i < n_peaks; ++i) {
context->move_to (i, tips[i].top); /* down 1 pixel */
context->line_to (i, tips[i].bot);
context->stroke ();
}
} else {
for (int i = 0; i < n_peaks; ++i) {
context->move_to (i, tips[i].top);
context->line_to (i, tips[i].bot);
context->stroke ();
}
}
/* now add dots to the top and bottom of each line (this is
* modelled on pyramix, except that we add clipping indicators.
*/
if (_global_show_waveform_clipping) {
set_source_rgba (context, _outline_color);
/* the height of the clip-indicator should be at most 7 pixels,
or 5% of the height of the waveview item.
*/
const double clip_height = min (7.0, ceil (_height * 0.05));
for (int i = 0; i < n_peaks; ++i) {
context->move_to (i, tips[i].top);
bool show_top_clip = (_shape == WaveView::Rectified && (tips[i].clip_max || tips[i].clip_min)) ||
tips[i].clip_max;
if (show_top_clip) {
set_source_rgba (context, _clip_color);
context->rel_line_to (0, clip_height);
context->stroke ();
set_source_rgba (context, _outline_color);
} else {
context->rel_line_to (0, 1.0);
context->stroke ();
}
if (_shape != WaveView::Rectified) {
context->move_to (i, tips[i].bot);
if (tips[i].clip_min) {
set_source_rgba (context, _clip_color);
context->rel_line_to (0, -clip_height);
context->stroke ();
set_source_rgba (context, _outline_color);
} else {
context->rel_line_to (0, -1.0);
context->stroke ();
}
}
}
}
if (show_zero_line()) {
set_source_rgba (context, _zero_color);
context->set_line_width (1.0);
context->move_to (0, y_extent (0.0) + 0.5);
context->line_to (n_peaks, y_extent (0.0) + 0.5);
context->stroke ();
}
}
void
WaveView::ensure_cache (framepos_t start, framepos_t end) const
{
if (_image && _sample_start <= start && _sample_end >= end) {
/* cache already covers required range, do nothing */
return;
}
/* sample position is canonical here, and we want to generate
* an image that spans about twice the canvas width
*/
const framepos_t center = start + ((end - start) / 2);
const framecnt_t canvas_samples = 2 * (_canvas->visible_area().width() * _samples_per_pixel);
/* we can request data from anywhere in the Source, between 0 and its length
*/
_sample_start = max ((framepos_t) 0, (center - canvas_samples));
_sample_end = min (center + canvas_samples, _region->source_length (0));
const int n_peaks = llrintf ((_sample_end - _sample_start)/ (double) _samples_per_pixel);
boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
_region->read_peaks (peaks.get(), n_peaks,
_sample_start, _sample_end - _sample_start,
_channel,
_samples_per_pixel);
draw_image (peaks.get(), n_peaks);
}
void
WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
assert (_samples_per_pixel != 0);
if (!_region) {
return;
}
Rect self = item_to_window (Rect (0.5, 0.0, _region->length() / _samples_per_pixel, _height));
boost::optional<Rect> d = self.intersection (area);
if (!d) {
return;
}
Rect draw = d.get();
/* window coordinates - pixels where x=0 is the left edge of the canvas
* window. We round down in case we were asked to
* draw "between" pixels at the start and/or end.
*/
const double draw_start = floor (draw.x0);
const double draw_end = floor (draw.x1);
// cerr << "Need to draw " << draw_start << " .. " << draw_end << endl;
/* image coordnates: pixels where x=0 is the start of this waveview,
* wherever it may be positioned. thus image_start=N means "an image
* that beings N pixels after the start of region that this waveview is
* representing.
*/
const framepos_t image_start = window_to_image (self.x0, draw_start);
const framepos_t image_end = window_to_image (self.x0, draw_end);
// cerr << "Image/WV space: " << image_start << " .. " << image_end << endl;
/* sample coordinates - note, these are not subject to rounding error */
framepos_t sample_start = _region_start + (image_start * _samples_per_pixel);
framepos_t sample_end = _region_start + (image_end * _samples_per_pixel);
// cerr << "Sample space: " << sample_start << " .. " << sample_end << endl;
ensure_cache (sample_start, sample_end);
// cerr << "Cache contains " << _cache->pixel_start() << " .. " << _cache->pixel_end() << " / "
// << _cache->sample_start() << " .. " << _cache->sample_end()
// << endl;
double image_offset = (_sample_start - _region->start()) / _samples_per_pixel;
// cerr << "Offset into image to place at zero: " << image_offset << endl;
context->rectangle (draw_start, draw.y0, draw_end - draw_start, draw.height());
/* round image origin position to an exact pixel in device space to
* avoid blurring
*/
double x = self.x0 + image_offset;
double y = self.y0;
context->user_to_device (x, y);
x = round (x);
y = round (y);
context->device_to_user (x, y);
context->set_source (_image, x, y);
context->fill ();
}
void
WaveView::compute_bounding_box () const
{
if (_region) {
_bounding_box = Rect (0.0, 0.0, _region->length() / _samples_per_pixel, _height);
} else {
_bounding_box = boost::optional<Rect> ();
}
_bounding_box_dirty = false;
}
void
WaveView::set_height (Distance height)
{
if (height != _height) {
begin_change ();
_height = height;
_bounding_box_dirty = true;
end_change ();
invalidate_image ();
}
}
void
WaveView::set_channel (int channel)
{
if (channel != _channel) {
begin_change ();
_channel = channel;
_bounding_box_dirty = true;
end_change ();
invalidate_image ();
}
}
void
WaveView::invalidate_image ()
{
begin_visual_change ();
_image.clear ();
_sample_start = -1;
_sample_end = -1;
end_visual_change ();
}
void
WaveView::set_logscaled (bool yn)
{
if (_logscaled != yn) {
_logscaled = yn;
invalidate_image ();
}
}
void
WaveView::gain_changed ()
{
invalidate_image ();
}
void
WaveView::set_zero_color (Color c)
{
if (_zero_color != c) {
_zero_color = c;
invalidate_image ();
}
}
void
WaveView::set_clip_color (Color c)
{
if (_clip_color != c) {
_clip_color = c;
invalidate_image ();
}
}
void
WaveView::set_show_zero_line (bool yn)
{
if (_show_zero != yn) {
_show_zero = yn;
invalidate_image ();
}
}
void
WaveView::set_shape (Shape s)
{
if (_shape != s) {
_shape = s;
invalidate_image ();
}
}
void
WaveView::set_amplitude_above_axis (double a)
{
if (_amplitude_above_axis != a) {
_amplitude_above_axis = a;
invalidate_image ();
}
}
void
WaveView::set_global_shape (Shape s)
{
if (_global_shape != s) {
_global_shape = s;
VisualPropertiesChanged (); /* EMIT SIGNAL */
}
}
void
WaveView::set_global_logscaled (bool yn)
{
if (_global_logscaled != yn) {
_global_logscaled = yn;
VisualPropertiesChanged (); /* EMIT SIGNAL */
}
}
void
WaveView::region_resized ()
{
if (!_region) {
return;
}
/* special: do not use _region->length() here to compute
bounding box because it will already have changed.
if we have a bounding box, use it.
*/
_pre_change_bounding_box = _bounding_box;
_bounding_box_dirty = true;
compute_bounding_box ();
end_change ();
}
Coord
WaveView::y_extent (double s) const
{
/* it is important that this returns an integral value, so that we
can ensure correct single pixel behaviour.
*/
Coord pos;
switch (_shape) {
case Rectified:
pos = floor (_height - (s * _height));
break;
default:
pos = floor ((1.0-s) * (_height / 2.0));
break;
}
return min (_height, (max (0.0, pos)));
}
void
WaveView::set_global_gradient_depth (double depth)
{
if (_global_gradient_depth != depth) {
_global_gradient_depth = depth;
VisualPropertiesChanged (); /* EMIT SIGNAL */
}
}
void
WaveView::set_global_show_waveform_clipping (bool yn)
{
if (_global_show_waveform_clipping != yn) {
_global_show_waveform_clipping = yn;
VisualPropertiesChanged (); /* EMIT SIGNAL */
}
}