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livetrax/libs/canvas/wave_view.cc
nick_m 5d5f83c56b The commit 3da9c3b740
wasn't the no-op it claimed to be.
2015-02-20 23:30:48 +11:00

1061 lines
27 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 "canvas/colors.h"
#include <gdkmm/general.h>
using namespace std;
using namespace ARDOUR;
using namespace ArdourCanvas;
#define CACHE_HIGH_WATER (2)
std::map <boost::shared_ptr<AudioSource>, std::vector<WaveView::CacheEntry> > WaveView::_image_cache;
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 (Canvas* c, boost::shared_ptr<ARDOUR::AudioRegion> region)
: Item (c)
, _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_amplitude (_region->scale_amplitude ())
, _start_shift (0.0)
, _region_start (region->start())
{
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 (Item* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
: Item (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_amplitude (_region->scale_amplitude ())
, _region_start (region->start())
{
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 ()
{
invalidate_image_cache ();
}
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) {
begin_visual_change ();
invalidate_image_cache ();
end_visual_change ();
}
}
void
WaveView::handle_clip_level_change ()
{
begin_visual_change ();
invalidate_image_cache ();
end_visual_change ();
}
void
WaveView::set_fill_color (Color c)
{
if (c != _fill_color) {
begin_visual_change ();
invalidate_image_cache ();
Fill::set_fill_color (c);
end_visual_change ();
}
}
void
WaveView::set_outline_color (Color c)
{
if (c != _outline_color) {
begin_visual_change ();
invalidate_image_cache ();
Outline::set_outline_color (c);
end_visual_change ();
}
}
void
WaveView::set_samples_per_pixel (double samples_per_pixel)
{
if (samples_per_pixel != _samples_per_pixel) {
begin_change ();
invalidate_image_cache ();
_samples_per_pixel = samples_per_pixel;
_bounding_box_dirty = true;
end_change ();
}
}
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 ();
}
}
void
WaveView::invalidate_image_cache ()
{
vector <uint32_t> deletion_list;
vector <CacheEntry> caches;
if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
caches = _image_cache.find (_region->audio_source ())->second;
} else {
return;
}
for (uint32_t i = 0; i < caches.size (); ++i) {
if (_channel != caches[i].channel
|| _height != caches[i].height
|| _region_amplitude != caches[i].amplitude
|| _fill_color != caches[i].fill_color) {
continue;
}
deletion_list.push_back (i);
}
while (deletion_list.size() > 0) {
caches[deletion_list.back ()].image.clear ();
caches.erase (caches.begin() + deletion_list.back());
deletion_list.pop_back();
}
if (caches.size () == 0) {
_image_cache.erase(_region->audio_source ());
} else {
_image_cache[_region->audio_source ()] = caches;
}
}
void
WaveView::consolidate_image_cache () const
{
list <uint32_t> deletion_list;
vector <CacheEntry> caches;
uint32_t other_entries = 0;
if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
caches = _image_cache.find (_region->audio_source ())->second;
}
for (uint32_t i = 0; i < caches.size (); ++i) {
if (_channel != caches[i].channel
|| _height != caches[i].height
|| _region_amplitude != caches[i].amplitude
|| _fill_color != caches[i].fill_color) {
other_entries++;
continue;
}
framepos_t segment_start = caches[i].start;
framepos_t segment_end = caches[i].end;
for (uint32_t j = i; j < caches.size (); ++j) {
if (i == j || _channel != caches[j].channel
|| _height != caches[i].height
|| _region_amplitude != caches[i].amplitude
|| _fill_color != caches[i].fill_color) {
continue;
}
if (caches[j].start >= segment_start && caches[j].end <= segment_end) {
deletion_list.push_back (j);
}
}
}
deletion_list.sort ();
deletion_list.unique ();
while (deletion_list.size() > 0) {
caches[deletion_list.back ()].image.clear ();
caches.erase (caches.begin() + deletion_list.back ());
deletion_list.pop_back();
}
/* We don't care if this channel/height/amplitude has anything in the cache - just drop the Last Added entries
until we reach a size where there is a maximum of CACHE_HIGH_WATER + other entries.
*/
while (caches.size() > CACHE_HIGH_WATER + other_entries) {
caches.front ().image.clear ();
caches.erase(caches.begin ());
}
if (caches.size () == 0) {
_image_cache.erase (_region->audio_source ());
} else {
_image_cache[_region->audio_source ()] = caches;
}
}
Coord
WaveView::y_extent (double s, bool /*round_to_lower_edge*/) const
{
/* it is important that this returns an integral value, so that we
* can ensure correct single pixel behaviour.
*
* we need (_height - max(wave_line_width))
* wave_line_width == 1 IFF top==bottom (1 sample per pixel or flat line)
* wave_line_width == 2 otherwise
* then round away from the zero line, towards peak
*/
if (_shape == Rectified) {
// we only ever have 1 point and align to the bottom (not center)
return floor ((1.0 - s) * (_height - 2.0));
} else {
/* currently canvas rectangle is off-by-one and we
* cannot draw a pixel at 0 (-.5 .. +.5) without it being
* clipped. A value 1.0 (ideally one point at y=0) ends
* up a pixel down. and a value of -1.0 (ideally y = _height-1)
* currently is on the bottom separator line :(
* So to make the complete waveform appear centered in
* a region, we translate by +.5 (instead of -.5)
* and waste two pixel of height: -4 (instad of -2)
*
* This needs fixing in canvas/rectangle the intersect
* functions and probably a couple of other places as well...
*/
Coord pos;
if (s < 0) {
pos = ceil ((1.0 - s) * .5 * (_height - 4.0));
} else {
pos = floor ((1.0 - s) * .5 * (_height - 4.0));
}
return min (_height - 4.0, (max (0.0, pos)));
}
}
struct LineTips {
double top;
double bot;
double spread;
bool clip_max;
bool clip_min;
LineTips() : top (0.0), bot (0.0), clip_max (false), clip_min (false) {}
};
struct ImageSet {
Cairo::RefPtr<Cairo::ImageSurface> wave;
Cairo::RefPtr<Cairo::ImageSurface> outline;
Cairo::RefPtr<Cairo::ImageSurface> clip;
Cairo::RefPtr<Cairo::ImageSurface> zero;
ImageSet() :
wave (0), outline (0), clip (0), zero (0) {}
};
void
WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peaks, int n_peaks) const
{
ImageSet images;
images.wave = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
images.outline = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
images.clip = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
images.zero = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
Cairo::RefPtr<Cairo::Context> wave_context = Cairo::Context::create (images.wave);
Cairo::RefPtr<Cairo::Context> outline_context = Cairo::Context::create (images.outline);
Cairo::RefPtr<Cairo::Context> clip_context = Cairo::Context::create (images.clip);
Cairo::RefPtr<Cairo::Context> zero_context = Cairo::Context::create (images.zero);
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_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() - 1.0;
const double p = alt_log_meter (fast_coefficient_to_dB (max (fabs (_peaks[i].max), fabs (_peaks[i].min))));
tips[i].top = y_extent (p, false);
tips[i].spread = p * (_height - 1.0);
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() - 1.0;
const double p = max(fabs (_peaks[i].max), fabs (_peaks[i].min));
tips[i].top = y_extent (p, false);
tips[i].spread = p * (_height - 2.0);
if (p >= clip_level) {
tips[i].clip_max = true;
}
}
}
} else {
if (_logscaled) {
for (int i = 0; i < n_peaks; ++i) {
double top = _peaks[i].max;
double bot = _peaks[i].min;
if (_peaks[i].max > 0 && _peaks[i].min > 0) {
if (fabs (_peaks[i].max) >= clip_level) {
tips[i].clip_max = true;
}
}
else if (_peaks[i].max < 0 && _peaks[i].min < 0) {
if (fabs (_peaks[i].min) >= clip_level) {
tips[i].clip_min = true;
}
} else {
if (fabs (_peaks[i].max) >= clip_level) {
tips[i].clip_max = true;
}
if (fabs (_peaks[i].min) >= clip_level) {
tips[i].clip_min = true;
}
}
if (top > 0.0) {
top = alt_log_meter (fast_coefficient_to_dB (top));
} else if (top < 0.0) {
top =-alt_log_meter (fast_coefficient_to_dB (-top));
} else {
top = 0.0;
}
if (bot > 0.0) {
bot = alt_log_meter (fast_coefficient_to_dB (bot));
} else if (bot < 0.0) {
bot = -alt_log_meter (fast_coefficient_to_dB (-bot));
} else {
bot = 0.0;
}
tips[i].top = y_extent (top, false);
tips[i].bot = y_extent (bot, true);
tips[i].spread = fabs (tips[i].top - tips[i].bot);
}
} else {
for (int i = 0; i < n_peaks; ++i) {
if (_peaks[i].max > 0 && _peaks[i].min > 0) {
if (fabs (_peaks[i].max) >= clip_level) {
tips[i].clip_max = true;
}
}
else if (_peaks[i].max < 0 && _peaks[i].min < 0) {
if (fabs (_peaks[i].min) >= clip_level) {
tips[i].clip_min = true;
}
} else {
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].max, false);
tips[i].bot = y_extent (_peaks[i].min, true);
tips[i].spread = fabs (tips[i].top - tips[i].bot);
}
}
}
Color alpha_one = rgba_to_color (0, 0, 0, 1.0);
set_source_rgba (wave_context, alpha_one);
set_source_rgba (outline_context, alpha_one);
set_source_rgba (clip_context, alpha_one);
set_source_rgba (zero_context, alpha_one);
/* ensure single-pixel lines */
wave_context->set_line_width (1.0);
wave_context->translate (0.5, +0.5);
outline_context->set_line_cap (Cairo::LINE_CAP_ROUND);
outline_context->set_line_width (1.0);
outline_context->translate (0.5, +0.5);
clip_context->set_line_width (1.0);
clip_context->translate (0.5, +0.5);
zero_context->set_line_width (1.0);
zero_context->translate (0.5, +0.5);
/* 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));
/* There are 3 possible components to draw at each x-axis position: the
waveform "line", the zero line and an outline/clip indicator. We
have to decide which of the 3 to draw at each position, pixel by
pixel. This makes the rendering less efficient but it is the only
way I can see to do this correctly.
To avoid constant source swapping and stroking, we draw the components separately
onto four alpha only image surfaces for use as a mask.
With only 1 pixel of spread between the top and bottom of the line,
we just draw the upper outline/clip indicator.
With 2 pixels of spread, we draw the upper and lower outline clip
indicators.
With 3 pixels of spread we draw the upper and lower outline/clip
indicators and at least 1 pixel of the waveform line.
With 5 pixels of spread, we draw all components.
We can do rectified as two separate passes because we have a much
easier decision regarding whether to draw the waveform line. We
always draw the clip/outline indicators.
*/
if (_shape == WaveView::Rectified) {
for (int i = 0; i < n_peaks; ++i) {
/* waveform line */
if (tips[i].spread >= 1.0) {
wave_context->move_to (i, tips[i].top);
wave_context->line_to (i, tips[i].bot);
}
if (_global_show_waveform_clipping && (tips[i].clip_max)) {
clip_context->move_to (i, tips[i].top);
/* clip-indicating upper terminal line */
clip_context->rel_line_to (0, min (clip_height, ceil(tips[i].spread + .5)));
} else {
outline_context->move_to (i, tips[i].top);
/* normal upper terminal dot */
outline_context->close_path ();
}
}
wave_context->stroke ();
clip_context->stroke ();
outline_context->stroke ();
} else {
const double height_2 = (_height - 4.0) * .5;
for (int i = 0; i < n_peaks; ++i) {
/* waveform line */
if (tips[i].spread >= 2.0) {
wave_context->move_to (i, tips[i].top);
wave_context->line_to (i, tips[i].bot);
}
if (i > 0) {
if (tips[i-1].top + 2 < tips[i].bot) {
wave_context->move_to (i-1, tips[i-1].top);
wave_context->line_to (i, tips[i].bot);
}
else if (tips[i-1].bot > tips[i].top + 2) {
wave_context->move_to (i-1, tips[i-1].bot);
wave_context->line_to (i, tips[i].top);
}
}
/* zero line */
if (tips[i].spread >= 5.0 && show_zero_line()) {
zero_context->move_to (i, floor(height_2));
zero_context->rel_line_to (1.0, 0);
}
if (tips[i].spread > 1.0) {
/* lower outline/clip indicator */
if (_global_show_waveform_clipping && tips[i].clip_min) {
clip_context->move_to (i, tips[i].bot);
/* clip-indicating lower terminal line */
const double sign = tips[i].bot > height_2 ? -1 : 1;
clip_context->rel_line_to (0, sign * min (clip_height, ceil (tips[i].spread + .5)));
} else {
outline_context->move_to (i, tips[i].bot);
/* normal lower terminal dot */
outline_context->close_path ();
}
} else {
if (tips[i].clip_min) {
// make sure we draw the clip
tips[i].clip_max = true;
}
}
/* upper outline/clip indicator */
if (_global_show_waveform_clipping && tips[i].clip_max) {
clip_context->move_to (i, tips[i].top);
/* clip-indicating upper terminal line */
const double sign = tips[i].top > height_2 ? -1 : 1;
clip_context->rel_line_to (0, sign * min(clip_height, ceil(tips[i].spread + .5)));
} else {
outline_context->move_to (i, tips[i].top);
/* normal upper terminal dot */
outline_context->close_path ();
}
}
wave_context->stroke ();
outline_context->stroke ();
clip_context->stroke ();
zero_context->stroke ();
}
Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
/* Here we set a source colour and use the various components as a mask. */
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[1] = 0.3;
stops[2] = 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[1], 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 = hsva_to_color (h, s, v, a);
color_to_rgba (center, 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);
context->set_source (gradient);
} else {
set_source_rgba (context, _fill_color);
}
context->mask (images.wave, 0, 0);
context->fill ();
set_source_rgba (context, _outline_color);
context->mask (images.outline, 0, 0);
context->fill ();
set_source_rgba (context, _clip_color);
context->mask (images.clip, 0, 0);
context->fill ();
set_source_rgba (context, _zero_color);
context->mask (images.zero, 0, 0);
context->fill ();
}
void
WaveView::get_image (Cairo::RefPtr<Cairo::ImageSurface>& image, framepos_t start, framepos_t end, double& image_offset) const
{
vector <CacheEntry> caches;
if (_image_cache.find (_region->audio_source ()) != _image_cache.end ()) {
caches = _image_cache.find (_region->audio_source ())->second;
}
/* Find a suitable ImageSurface.
*/
for (uint32_t i = 0; i < caches.size (); ++i) {
if (_channel != caches[i].channel
|| _height != caches[i].height
|| _region_amplitude != caches[i].amplitude
|| _fill_color != caches[i].fill_color) {
continue;
}
framepos_t segment_start = caches[i].start;
framepos_t segment_end = caches[i].end;
if (end <= segment_end && start >= segment_start) {
image_offset = (segment_start - _region_start) / _samples_per_pixel;
image = caches[i].image;
return;
}
}
consolidate_image_cache ();
/* 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 = _canvas->visible_area().width() * _samples_per_pixel; /* one canvas width */
/* we can request data from anywhere in the Source, between 0 and its length
*/
framepos_t sample_start = max ((framepos_t) 0, (center - canvas_samples));
framepos_t 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);
image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, _height);
draw_image (image, peaks.get(), n_peaks);
_image_cache[_region->audio_source ()].push_back (CacheEntry (_channel, _height, _region_amplitude, _fill_color, sample_start, sample_end, image));
image_offset = (sample_start - _region->start()) / _samples_per_pixel;
//cerr << "_image_cache size is : " << _image_cache.size() << " entries for this audiosource : " << _image_cache.find (_region->audio_source ())->second.size() << endl;
return;
}
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 (0.0, 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.
*/
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;
Cairo::RefPtr<Cairo::ImageSurface> image;
double image_offset = 0;
get_image (image, sample_start, sample_end, image_offset);
// cerr << "Offset into image to place at zero: " << image_offset << endl;
if (_start_shift && (sample_start == _region_start) && (self.x0 == draw.x0)) {
/* we are going to draw the first pixel for this region, but
we may not want this to overlap a border around the
waveform. If so, _start_shift will be set.
*/
//cerr << name.substr (23) << " ss = " << sample_start << " rs = " << _region_start << " sf = " << _start_shift << " ds = " << draw_start << " self = " << self << " draw = " << draw << endl;
//draw_start += _start_shift;
//image_offset += _start_shift;
}
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 ();
invalidate_image_cache ();
_height = height;
_bounding_box_dirty = true;
end_change ();
}
}
void
WaveView::set_channel (int channel)
{
if (channel != _channel) {
begin_change ();
invalidate_image_cache ();
_channel = channel;
_bounding_box_dirty = true;
end_change ();
}
}
void
WaveView::set_logscaled (bool yn)
{
if (_logscaled != yn) {
begin_visual_change ();
invalidate_image_cache ();
_logscaled = yn;
end_visual_change ();
}
}
void
WaveView::gain_changed ()
{
begin_visual_change ();
invalidate_image_cache ();
_region_amplitude = _region->scale_amplitude ();
end_visual_change ();
}
void
WaveView::set_zero_color (Color c)
{
if (_zero_color != c) {
begin_visual_change ();
invalidate_image_cache ();
_zero_color = c;
end_visual_change ();
}
}
void
WaveView::set_clip_color (Color c)
{
if (_clip_color != c) {
begin_visual_change ();
invalidate_image_cache ();
_clip_color = c;
end_visual_change ();
}
}
void
WaveView::set_show_zero_line (bool yn)
{
if (_show_zero != yn) {
begin_visual_change ();
invalidate_image_cache ();
_show_zero = yn;
end_visual_change ();
}
}
void
WaveView::set_shape (Shape s)
{
if (_shape != s) {
begin_visual_change ();
invalidate_image_cache ();
_shape = s;
end_visual_change ();
}
}
void
WaveView::set_amplitude_above_axis (double a)
{
if (_amplitude_above_axis != a) {
begin_visual_change ();
invalidate_image_cache ();
_amplitude_above_axis = a;
end_visual_change ();
}
}
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::set_region_start (frameoffset_t start)
{
if (!_region) {
return;
}
if (_region_start == start) {
return;
}
begin_change ();
_region_start = start;
_bounding_box_dirty = true;
end_change ();
}
void
WaveView::region_resized ()
{
/* Called when the region start or end (thus length) has changed.
*/
if (!_region) {
return;
}
begin_change ();
_region_start = _region->start();
_bounding_box_dirty = true;
end_change ();
}
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;
ClipLevelChanged ();
}
}
void
WaveView::set_start_shift (double pixels)
{
if (pixels < 0) {
return;
}
begin_visual_change ();
_start_shift = pixels;
end_visual_change ();
}