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livetrax/libs/canvas/wave_view.cc
Tim Mayberry 6e91ee071c Reimplementation of large parts of the WaveView class 
The drawing itself should be unchanged but much of the rest of the
implementation has changed. The WaveViewThreads and WaveViewDrawingThread
classes were added and allow multiple drawing threads.

The Item::prepare_for_render interface is implemented by WaveView to enable
queuing draw requests for the drawing threads to process as soon as the state
change occurs during Editor::visual_changer, which often means the images will
be finished by the time they are needed in WaveView::render. This can
significantly reduce total render time and also flickering caused by images not
being ready for display.

If the drawing thread/s cannot finish the request by the time it is required in
WaveView::render then cancel it and draw the WaveViewImage in the GUI thread if
it is likely it can be completed in the current render pass/frame.  This change
also helps reduce the flickering caused by images not being ready with threaded
rendering, but with several drawing threads, drawing in the GUI thread may not
often occur (unless explicitly requested).

Allow unfinished images to be returned from the cache in
WaveView::prepare_for_render so that new draw requests aren't queued for
duplicate images. This reduces the amount of drawing for instance in
compositions where there are many instances of the same sample/waveform
displayed on the canvas as only a single image should be drawn.

Use a random width within a certain range for
WaveView::optimal_image_width_samples so that image drawing is less likely to
occur at the same time (which will cause a spike in render/draw time and
increase the chance of flickering waveforms).

Move implementations of the private WaveView classes into wave_view_private.h
and wave_view_private.cc source files.

Incorporate a fix for limiting the waveview image size to the cairo image size
limit.

Should hopefully Resolve: #6478
2017-06-26 08:40:47 +10:00

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/*
Copyright (C) 2011-2013 Paul Davis
Copyright (C) 2017 Tim Mayberry
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 <boost/scoped_array.hpp>
#include <cairomm/cairomm.h>
#include <glibmm/threads.h>
#include "gtkmm2ext/utils.h"
#include "gtkmm2ext/gui_thread.h"
#include "pbd/base_ui.h"
#include "pbd/compose.h"
#include "pbd/convert.h"
#include "pbd/signals.h"
#include "pbd/stacktrace.h"
#include "ardour/types.h"
#include "ardour/dB.h"
#include "ardour/lmath.h"
#include "ardour/audioregion.h"
#include "ardour/audiosource.h"
#include "ardour/session.h"
#include "canvas/canvas.h"
#include "canvas/colors.h"
#include "canvas/debug.h"
#include "canvas/utils.h"
#include "canvas/wave_view.h"
#include "canvas/wave_view_private.h"
#include "evoral/Range.hpp"
#include <gdkmm/general.h>
#include "gtkmm2ext/gui_thread.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
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::_global_clip_level = 0.98853;
PBD::Signal0<void> WaveView::VisualPropertiesChanged;
PBD::Signal0<void> WaveView::ClipLevelChanged;
/* NO_THREAD_WAVEVIEWS is defined by the top level wscript
* if --no-threaded-waveviws is provided at the configure step.
*/
#ifndef NO_THREADED_WAVEVIEWS
#define ENABLE_THREADED_WAVEFORM_RENDERING
#endif
WaveView::WaveView (Canvas* c, boost::shared_ptr<ARDOUR::AudioRegion> region)
: Item (c)
, _region (region)
, _props (new WaveViewProperties (region))
, _shape_independent (false)
, _logscaled_independent (false)
, _gradient_depth_independent (false)
, _draw_image_in_gui_thread (false)
, _always_draw_image_in_gui_thread (false)
{
init ();
}
WaveView::WaveView (Item* parent, boost::shared_ptr<ARDOUR::AudioRegion> region)
: Item (parent)
, _region (region)
, _props (new WaveViewProperties (region))
, _shape_independent (false)
, _logscaled_independent (false)
, _gradient_depth_independent (false)
, _draw_image_in_gui_thread (false)
, _always_draw_image_in_gui_thread (false)
{
init ();
}
void
WaveView::init ()
{
#ifdef ENABLE_THREADED_WAVEFORM_RENDERING
WaveViewThreads::initialize ();
#endif
_props->fill_color = _fill_color;
_props->outline_color = _outline_color;
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 ()
{
#ifdef ENABLE_THREADED_WAVEFORM_RENDERING
WaveViewThreads::deinitialize ();
#endif
reset_cache_group ();
}
string
WaveView::debug_name() const
{
return _region->name () + string (":") + PBD::to_string (_props->channel + 1);
}
void
WaveView::set_always_get_image_in_thread (bool yn)
{
_always_draw_image_in_gui_thread = yn;
}
void
WaveView::handle_visual_property_change ()
{
bool changed = false;
if (!_shape_independent && (_props->shape != global_shape())) {
_props->shape = global_shape();
changed = true;
}
if (!_logscaled_independent && (_props->logscaled != global_logscaled())) {
_props->logscaled = global_logscaled();
changed = true;
}
if (!_gradient_depth_independent && (_props->gradient_depth != global_gradient_depth())) {
_props->gradient_depth = global_gradient_depth();
changed = true;
}
if (changed) {
begin_visual_change ();
end_visual_change ();
}
}
void
WaveView::handle_clip_level_change ()
{
begin_visual_change ();
end_visual_change ();
}
void
WaveView::set_fill_color (Color c)
{
if (c != _fill_color) {
begin_visual_change ();
Fill::set_fill_color (c);
_props->fill_color = _fill_color; // ugh
end_visual_change ();
}
}
void
WaveView::set_outline_color (Color c)
{
if (c != _outline_color) {
begin_visual_change ();
Outline::set_outline_color (c);
_props->outline_color = c;
end_visual_change ();
}
}
void
WaveView::set_samples_per_pixel (double samples_per_pixel)
{
if (_props->samples_per_pixel != samples_per_pixel) {
begin_change ();
_props->samples_per_pixel = samples_per_pixel;
_bounding_box_dirty = true;
end_change ();
}
}
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 (_global_clip_level != clip_level) {
_global_clip_level = clip_level;
ClipLevelChanged ();
}
}
boost::shared_ptr<WaveViewDrawRequest>
WaveView::create_draw_request (WaveViewProperties const& props) const
{
assert (props.is_valid());
boost::shared_ptr<WaveViewDrawRequest> request (new WaveViewDrawRequest);
request->image = boost::shared_ptr<WaveViewImage> (new WaveViewImage (_region, props));
return request;
}
void
WaveView::prepare_for_render (Rect const& area) const
{
if (draw_image_in_gui_thread()) {
// Drawing image in GUI thread in WaveView::render
return;
}
Rect draw_rect;
Rect self_rect;
// all in window coordinate space
if (!get_item_and_draw_rect_in_window_coords (area, self_rect, draw_rect)) {
return;
}
double const image_start_pixel_offset = draw_rect.x0 - self_rect.x0;
double const image_end_pixel_offset = draw_rect.x1 - self_rect.x0;
WaveViewProperties required_props = *_props;
required_props.set_sample_positions_from_pixel_offsets (image_start_pixel_offset,
image_end_pixel_offset);
if (!required_props.is_valid ()) {
return;
}
if (_image) {
if (_image->props.is_equivalent (required_props)) {
return;
} else {
// Image does not contain sample area required
}
}
boost::shared_ptr<WaveViewDrawRequest> request = create_draw_request (required_props);
queue_draw_request (request);
}
bool
WaveView::get_item_and_draw_rect_in_window_coords (Rect const& canvas_rect, Rect& item_rect,
Rect& draw_rect) const
{
/* a WaveView is intimately connected to an AudioRegion. It will
* display the waveform within the region, anywhere from the start of
* the region to its end.
*
* the area we've been asked to render may overlap with area covered
* by the region in any of the normal ways:
*
* - it may begin and end within the area covered by the region
* - it may start before and end after the area covered by region
* - it may start before and end within the area covered by the region
* - it may start within and end after the area covered by the region
* - it may be precisely coincident with the area covered by region.
*
* So let's start by determining the area covered by the region, in
* window coordinates. It begins at zero (in item coordinates for this
* waveview, and extends to region_length() / _samples_per_pixel.
*/
double const width = region_length() / _props->samples_per_pixel;
item_rect = item_to_window (Rect (0.0, 0.0, width, _props->height));
/* Now lets get the intersection with the area we've been asked to draw */
draw_rect = item_rect.intersection (canvas_rect);
if (!draw_rect) {
// No intersection with drawing area
return false;
}
/* draw_rect now defines the rectangle we need to update/render the waveview
* into, in window coordinate space.
*
* We round down in case we were asked to draw "between" pixels at the start
* and/or end.
*/
draw_rect.x0 = floor (draw_rect.x0);
draw_rect.x1 = floor (draw_rect.x1);
return true;
}
void
WaveView::queue_draw_request (boost::shared_ptr<WaveViewDrawRequest> const& request) const
{
// Don't enqueue any requests without a thread to dequeue them.
assert (WaveViewThreads::enabled());
if (!request || !request->is_valid()) {
return;
}
if (current_request) {
current_request->cancel ();
}
boost::shared_ptr<WaveViewImage> cached_image =
get_cache_group ()->lookup_image (request->image->props);
if (cached_image) {
// The image may not be finished at this point but that is fine, great in
// fact as it means it should only need to be drawn once.
request->image = cached_image;
current_request = request;
} else {
// now we can finally set an optimal image now that we are not using the
// properties for comparisons.
request->image->props.set_width_samples (optimal_image_width_samples ());
current_request = request;
// Add it to the cache so that other WaveViews can refer to the same image
get_cache_group()->add_image (current_request->image);
WaveViewThreads::enqueue_draw_request (current_request);
}
}
void
WaveView::compute_tips (ARDOUR::PeakData const& peak, WaveView::LineTips& tips,
double const effective_height)
{
/* remember: canvas (and cairo) coordinate space puts the origin at the upper left.
So, a sample value of 1.0 (0dbFS) will be computed as:
(1.0 - 1.0) * 0.5 * effective_height
which evaluates to 0, or the top of the image.
A sample value of -1.0 will be computed as
(1.0 + 1.0) * 0.5 * effective height
which evaluates to effective height, or the bottom of the image.
*/
const double pmax = (1.0 - peak.max) * 0.5 * effective_height;
const double pmin = (1.0 - peak.min) * 0.5 * effective_height;
/* remember that the bottom of the image (pmin) has larger y-coordinates
than the top (pmax).
*/
double spread = (pmin - pmax) * 0.5;
/* find the nearest pixel to the nominal center. */
const double center = round (pmin - spread);
if (spread < 1.0) {
/* minimum distance between line ends is 1 pixel, and we want it "centered" on a pixel,
as per cairo single-pixel line issues.
NOTE: the caller will not draw a line between these two points if the spread is
less than 2 pixels. So only the tips.top value matters, which is where we will
draw a single pixel as part of the outline.
*/
tips.top = center;
tips.bot = center + 1.0;
} else {
/* round spread above and below center to an integer number of pixels */
spread = round (spread);
/* top and bottom are located equally either side of the center */
tips.top = center - spread;
tips.bot = center + spread;
}
tips.top = min (effective_height, max (0.0, tips.top));
tips.bot = min (effective_height, max (0.0, tips.bot));
}
Coord
WaveView::y_extent (double s, Shape const shape, double const height)
{
assert (shape == Rectified);
return floor ((1.0 - s) * height);
}
void
WaveView::draw_absent_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* peaks, int n_peaks)
{
const double height = image->get_height();
Cairo::RefPtr<Cairo::ImageSurface> stripe = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, height);
Cairo::RefPtr<Cairo::Context> stripe_context = Cairo::Context::create (stripe);
stripe_context->set_antialias (Cairo::ANTIALIAS_NONE);
uint32_t stripe_separation = 150;
double start = - floor (height / stripe_separation) * stripe_separation;
int stripe_x = 0;
while (start < n_peaks) {
stripe_context->move_to (start, 0);
stripe_x = start + height;
stripe_context->line_to (stripe_x, height);
start += stripe_separation;
}
stripe_context->set_source_rgba (1.0, 1.0, 1.0, 1.0);
stripe_context->set_line_cap (Cairo::LINE_CAP_SQUARE);
stripe_context->set_line_width(50);
stripe_context->stroke();
Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
context->set_source_rgba (1.0, 1.0, 0.0, 0.3);
context->mask (stripe, 0, 0);
context->fill ();
}
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,
boost::shared_ptr<WaveViewDrawRequest> req)
{
const double height = image->get_height();
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);
wave_context->set_antialias (Cairo::ANTIALIAS_NONE);
outline_context->set_antialias (Cairo::ANTIALIAS_NONE);
clip_context->set_antialias (Cairo::ANTIALIAS_NONE);
zero_context->set_antialias (Cairo::ANTIALIAS_NONE);
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 = _global_clip_level * req->image->props.amplitude;
const Shape shape = req->image->props.shape;
const bool logscaled = req->image->props.logscaled;
if (req->image->props.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, shape, height);
tips[i].spread = p * height;
if (peaks[i].max >= clip_level) {
tips[i].clip_max = true;
}
if (-(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, shape, height);
tips[i].spread = p * height;
if (p >= clip_level) {
tips[i].clip_max = true;
}
}
}
} else {
if (logscaled) {
for (int i = 0; i < n_peaks; ++i) {
PeakData p;
p.max = peaks[i].max;
p.min = peaks[i].min;
if (peaks[i].max >= clip_level) {
tips[i].clip_max = true;
}
if (-(peaks[i].min) >= clip_level) {
tips[i].clip_min = true;
}
if (p.max > 0.0) {
p.max = alt_log_meter (fast_coefficient_to_dB (p.max));
} else if (p.max < 0.0) {
p.max =-alt_log_meter (fast_coefficient_to_dB (-p.max));
} else {
p.max = 0.0;
}
if (p.min > 0.0) {
p.min = alt_log_meter (fast_coefficient_to_dB (p.min));
} else if (p.min < 0.0) {
p.min = -alt_log_meter (fast_coefficient_to_dB (-p.min));
} else {
p.min = 0.0;
}
compute_tips (p, tips[i], height);
tips[i].spread = tips[i].bot - tips[i].top;
}
} else {
for (int i = 0; i < n_peaks; ++i) {
if (peaks[i].max >= clip_level) {
tips[i].clip_max = true;
}
if (-(peaks[i].min) >= clip_level) {
tips[i].clip_min = true;
}
compute_tips (peaks[i], tips[i], height);
tips[i].spread = tips[i].bot - tips[i].top;
}
}
}
if (req->stopped()) {
return;
}
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_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);
}
/* clip indicator */
if (_global_show_waveform_clipping && (tips[i].clip_max || tips[i].clip_min)) {
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->rel_line_to (0, -1.0);
}
}
wave_context->stroke ();
clip_context->stroke ();
outline_context->stroke ();
} else {
const int height_zero = floor(height * .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);
}
/* draw square waves and other discontiguous points clearly */
if (i > 0) {
if (tips[i-1].top + 2 < tips[i].top) {
wave_context->move_to (i-1, tips[i-1].top);
wave_context->line_to (i-1, (tips[i].bot + tips[i-1].top)/2);
wave_context->move_to (i, (tips[i].bot + tips[i-1].top)/2);
wave_context->line_to (i, tips[i].top);
} else if (tips[i-1].bot > tips[i].bot + 2) {
wave_context->move_to (i-1, tips[i-1].bot);
wave_context->line_to (i-1, (tips[i].top + tips[i-1].bot)/2);
wave_context->move_to (i, (tips[i].top + tips[i-1].bot)/2);
wave_context->line_to (i, tips[i].bot);
}
}
/* zero line, show only if there is enough spread
or the waveform line does not cross zero line */
bool const show_zero_line = req->image->props.show_zero;
if (show_zero_line && ((tips[i].spread >= 5.0) || (tips[i].top > height_zero ) || (tips[i].bot < height_zero)) ) {
zero_context->move_to (i, height_zero);
zero_context->rel_line_to (1.0, 0);
}
if (tips[i].spread > 1.0) {
bool clipped = false;
/* outline/clip indicators */
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 + 0.5)));
clipped = true;
}
if (_global_show_waveform_clipping && tips[i].clip_min) {
clip_context->move_to (i, tips[i].bot);
/* clip-indicating lower terminal line */
clip_context->rel_line_to (0, - min (clip_height, ceil(tips[i].spread + 0.5)));
clipped = true;
}
if (!clipped && tips[i].spread > 2.0) {
/* only draw the outline if the spread
implies 3 or more pixels (so that we see 1
white pixel in the middle).
*/
outline_context->move_to (i, tips[i].bot);
/* normal lower terminal dot; line moves up */
outline_context->rel_line_to (0, -1.0);
outline_context->move_to (i, tips[i].top);
/* normal upper terminal dot, line moves down */
outline_context->rel_line_to (0, 1.0);
}
} else {
bool clipped = false;
/* outline/clip indicator */
if (_global_show_waveform_clipping && (tips[i].clip_max || tips[i].clip_min)) {
clip_context->move_to (i, tips[i].top);
/* clip-indicating upper / lower terminal line */
clip_context->rel_line_to (0, 1.0);
clipped = true;
}
if (!clipped) {
/* special case where only 1 pixel of
* the waveform line is drawn (and
* nothing else).
*
* we draw a 1px "line", pretending
* that the span is 1.0 (whether it is
* zero or 1.0)
*/
wave_context->move_to (i, tips[i].top);
wave_context->rel_line_to (0, 1.0);
}
}
}
wave_context->stroke ();
outline_context->stroke ();
clip_context->stroke ();
zero_context->stroke ();
}
if (req->stopped()) {
return;
}
Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
/* Here we set a source colour and use the various components as a mask. */
const Color fill_color = req->image->props.fill_color;
const double gradient_depth = req->image->props.gradient_depth;
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);
}
if (req->stopped()) {
return;
}
context->mask (images.wave, 0, 0);
context->fill ();
set_source_rgba (context, req->image->props.outline_color);
context->mask (images.outline, 0, 0);
context->fill ();
set_source_rgba (context, req->image->props.clip_color);
context->mask (images.clip, 0, 0);
context->fill ();
set_source_rgba (context, req->image->props.zero_color);
context->mask (images.zero, 0, 0);
context->fill ();
}
framecnt_t
WaveView::optimal_image_width_samples () const
{
/* Compute how wide the image should be in samples.
*
* The resulting image should be wider than the canvas width so that the
* image does not have to be redrawn each time the canvas offset changes, but
* drawing too much unnecessarily, for instance when zooming into the canvas
* the part of the image that is outside of the visible canvas area may never
* be displayed and will just increase apparent render time and reduce
* responsiveness in non-threaded rendering and cause "flashing" waveforms in
* threaded rendering mode.
*
* Another thing to consider is that if there are a number of waveforms on
* the canvas that are the width of the canvas then we don't want to have to
* draw the images for them all at once as it will cause a spike in render
* time, or in threaded rendering mode it will mean all the draw requests will
* the queued during the same frame/expose event. This issue can be
* alleviated by using an element of randomness in selecting the image width.
*
* If the value of samples per pixel is less than 1/10th of a second, use
* 1/10th of a second instead.
*/
framecnt_t canvas_width_samples = _canvas->visible_area().width() * _props->samples_per_pixel;
const framecnt_t one_tenth_of_second = _region->session().frame_rate() / 10;
/* If zoomed in where a canvas item interects with the canvas area but
* stretches for many pages either side, to avoid having draw all images when
* the canvas scrolls by a page width the multiplier would have to be a
* randomized amount centered around 3 times the visible canvas width, but
* for other operations like zooming or even with a stationary playhead it is
* a lot of extra drawing that can affect performance.
*
* So without making things too complicated with different widths for
* different operations, try to use a width that is a balance and will work
* well for scrolling(non-page width) so all the images aren't redrawn at the
* same time but also faster for sequential zooming operations.
*
* Canvas items that don't intersect with the edges of the visible canvas
* will of course only draw images that are the pixel width of the item.
*
* It is a perhaps a coincidence that these values are centered roughly
* around the golden ratio but they did work well in my testing.
*/
const double min_multiplier = 1.4;
const double max_multiplier = 1.8;
/**
* A combination of high resolution screens, high samplerates and high
* zoom levels(1 sample per pixel) can cause 1/10 of a second(in
* pixels) to exceed the cairo image size limit.
*/
const double cairo_image_limit = 32767.0;
const double max_image_width = cairo_image_limit / max_multiplier;
framecnt_t max_width_samples = floor (max_image_width / _props->samples_per_pixel);
const framecnt_t one_tenth_of_second_limited = std::min (one_tenth_of_second, max_width_samples);
framecnt_t new_sample_count = std::max (canvas_width_samples, one_tenth_of_second_limited);
const double multiplier = g_random_double_range (min_multiplier, max_multiplier);
return new_sample_count * multiplier;
}
void
WaveView::set_image (boost::shared_ptr<WaveViewImage> img) const
{
get_cache_group ()->add_image (img);
_image = img;
}
void
WaveView::process_draw_request (boost::shared_ptr<WaveViewDrawRequest> req)
{
boost::shared_ptr<const ARDOUR::AudioRegion> region = req->image->region.lock();
if (!region) {
return;
}
if (req->stopped()) {
return;
}
WaveViewProperties const& props = req->image->props;
const int n_peaks = props.get_width_pixels ();
assert (n_peaks > 0 && n_peaks < 32767);
boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
/* Note that Region::read_peaks() takes a start position based on an
offset into the Region's **SOURCE**, rather than an offset into
the Region itself.
*/
framecnt_t peaks_read =
region->read_peaks (peaks.get (), n_peaks, props.get_sample_start (),
props.get_length_samples (), props.channel, props.samples_per_pixel);
if (req->stopped()) {
return;
}
Cairo::RefPtr<Cairo::ImageSurface> cairo_image =
Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, req->image->props.height);
// http://cairographics.org/manual/cairo-Image-Surfaces.html#cairo-image-surface-create
// This function always returns a valid pointer, but it will return a pointer to a "nil" surface..
// but there's some evidence that req->image can be NULL.
// http://tracker.ardour.org/view.php?id=6478
assert (cairo_image);
if (peaks_read > 0) {
/* region amplitude will have been used to generate the
* peak values already, but not the visual-only
* amplitude_above_axis. So apply that here before
* rendering.
*/
const double amplitude_above_axis = props.amplitude_above_axis;
if (amplitude_above_axis != 1.0) {
for (framecnt_t i = 0; i < n_peaks; ++i) {
peaks[i].max *= amplitude_above_axis;
peaks[i].min *= amplitude_above_axis;
}
}
draw_image (cairo_image, peaks.get(), n_peaks, req);
} else {
draw_absent_image (cairo_image, peaks.get(), n_peaks);
}
if (req->stopped ()) {
return;
}
// Assign now that we are sure all drawing is complete as that is what
// determines whether a request was finished.
req->image->cairo_image = cairo_image;
}
bool
WaveView::draw_image_in_gui_thread () const
{
return _draw_image_in_gui_thread || _always_draw_image_in_gui_thread || !rendered () ||
!WaveViewThreads::enabled ();
}
void
WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
assert (_props->samples_per_pixel != 0);
if (!_region) { // assert?
return;
}
Rect draw;
Rect self;
if (!get_item_and_draw_rect_in_window_coords (area, self, draw)) {
assert(true);
return;
}
double const image_start_pixel_offset = draw.x0 - self.x0;
double const image_end_pixel_offset = draw.x1 - self.x0;
if (image_start_pixel_offset == image_end_pixel_offset) {
// this may happen if zoomed very far out with a small region
return;
}
WaveViewProperties required_props = *_props;
required_props.set_sample_positions_from_pixel_offsets (image_start_pixel_offset,
image_end_pixel_offset);
assert (required_props.is_valid());
boost::shared_ptr<WaveViewImage> image_to_draw;
if (current_request) {
if (!current_request->image->props.is_equivalent (required_props)) {
// The WaveView properties may have been updated during recording between
// prepare_for_render and render calls and the new required props have
// different end sample value.
current_request->cancel ();
current_request.reset ();
} else if (current_request->finished ()) {
image_to_draw = current_request->image;
current_request.reset ();
}
} else {
// No current Request
}
if (!image_to_draw && _image) {
if (_image->props.is_equivalent (required_props)) {
// Image contains required properties
image_to_draw = _image;
} else {
// Image does not contain properties required
}
}
if (!image_to_draw) {
image_to_draw = get_cache_group ()->lookup_image (required_props);
if (image_to_draw && !image_to_draw->finished ()) {
// Found equivalent but unfinished Image in cache
image_to_draw.reset ();
}
}
if (!image_to_draw) {
// No existing image to draw
boost::shared_ptr<WaveViewDrawRequest> const request = create_draw_request (required_props);
if (draw_image_in_gui_thread ()) {
// now that we have to draw something, draw more than required.
request->image->props.set_width_samples (optimal_image_width_samples ());
process_draw_request (request);
image_to_draw = request->image;
} else if (current_request) {
if (current_request->finished ()) {
// There is a chance the request is now finished since checking above
image_to_draw = current_request->image;
current_request.reset ();
} else if (_canvas->get_microseconds_since_render_start () < 15000) {
current_request->cancel ();
current_request.reset ();
// Drawing image in GUI thread as we have time
// now that we have to draw something, draw more than required.
request->image->props.set_width_samples (optimal_image_width_samples ());
process_draw_request (request);
image_to_draw = request->image;
} else {
// Waiting for current request to finish
redraw ();
return;
}
} else {
// Defer the rendering to another thread or perhaps render pass if
// a thread cannot generate it in time.
queue_draw_request (request);
redraw ();
return;
}
}
/* reset this so that future missing images can be generated in a worker thread. */
_draw_image_in_gui_thread = false;
assert (image_to_draw);
/* compute the first pixel of the image that should be used when we
* render the specified range.
*/
double image_origin_in_self_coordinates =
(image_to_draw->props.get_sample_start () - _props->region_start) / _props->samples_per_pixel;
/* the image may only be a best-effort ... it may not span the entire
* range requested, though it is guaranteed to cover the start. So
* determine how many pixels we can actually draw.
*/
const double draw_start_pixel = draw.x0;
const double draw_end_pixel = draw.x1;
double draw_width_pixels = draw_end_pixel - draw_start_pixel;
if (image_to_draw != _image) {
/* the image is guaranteed to start at or before
* draw_start. But if it starts before draw_start, that reduces
* the maximum available width we can render with.
*
* so .. clamp the draw width to the smaller of what we need to
* draw or the available width of the image.
*/
draw_width_pixels = min ((double)image_to_draw->cairo_image->get_width (), draw_width_pixels);
set_image (image_to_draw);
}
context->rectangle (draw_start_pixel, draw.y0, draw_width_pixels, draw.height());
/* round image origin position to an exact pixel in device space to
* avoid blurring
*/
double x = self.x0 + image_origin_in_self_coordinates;
double y = self.y0;
context->user_to_device (x, y);
x = round (x);
y = round (y);
context->device_to_user (x, y);
/* the coordinates specify where in "user coordinates" (i.e. what we
* generally call "canvas coordinates" in this code) the image origin
* will appear. So specifying (10,10) will put the upper left corner of
* the image at (10,10) in user space.
*/
context->set_source (image_to_draw->cairo_image, x, y);
context->fill ();
}
void
WaveView::compute_bounding_box () const
{
if (_region) {
_bounding_box = Rect (0.0, 0.0, region_length() / _props->samples_per_pixel, _props->height);
} else {
_bounding_box = Rect ();
}
_bounding_box_dirty = false;
}
void
WaveView::set_height (Distance height)
{
if (_props->height != height) {
begin_change ();
_props->height = height;
_draw_image_in_gui_thread = true;
_bounding_box_dirty = true;
end_change ();
}
}
void
WaveView::set_channel (int channel)
{
if (_props->channel != channel) {
begin_change ();
_props->channel = channel;
reset_cache_group ();
_bounding_box_dirty = true;
end_change ();
}
}
void
WaveView::set_logscaled (bool yn)
{
if (_props->logscaled != yn) {
begin_visual_change ();
_props->logscaled = yn;
end_visual_change ();
}
}
void
WaveView::set_gradient_depth (double)
{
// TODO ??
}
double
WaveView::gradient_depth () const
{
return _props->gradient_depth;
}
void
WaveView::gain_changed ()
{
begin_visual_change ();
_props->amplitude = _region->scale_amplitude ();
_draw_image_in_gui_thread = true;
end_visual_change ();
}
void
WaveView::set_zero_color (Color c)
{
if (_props->zero_color != c) {
begin_visual_change ();
_props->zero_color = c;
end_visual_change ();
}
}
void
WaveView::set_clip_color (Color c)
{
if (_props->clip_color != c) {
begin_visual_change ();
_props->clip_color = c;
end_visual_change ();
}
}
void
WaveView::set_show_zero_line (bool yn)
{
if (_props->show_zero != yn) {
begin_visual_change ();
_props->show_zero = yn;
end_visual_change ();
}
}
bool
WaveView::show_zero_line () const
{
return _props->show_zero;
}
void
WaveView::set_shape (Shape s)
{
if (_props->shape != s) {
begin_visual_change ();
_props->shape = s;
end_visual_change ();
}
}
void
WaveView::set_amplitude_above_axis (double a)
{
if (fabs (_props->amplitude_above_axis - a) > 0.01) {
begin_visual_change ();
_props->amplitude_above_axis = a;
_draw_image_in_gui_thread = true;
end_visual_change ();
}
}
double
WaveView::amplitude_above_axis () const
{
return _props->amplitude_above_axis;
}
void
WaveView::set_global_shape (Shape s)
{
if (_global_shape != s) {
_global_shape = s;
WaveViewCache::get_instance()->clear_cache ();
VisualPropertiesChanged (); /* EMIT SIGNAL */
}
}
void
WaveView::set_global_logscaled (bool yn)
{
if (_global_logscaled != yn) {
_global_logscaled = yn;
WaveViewCache::get_instance()->clear_cache ();
VisualPropertiesChanged (); /* EMIT SIGNAL */
}
}
framecnt_t
WaveView::region_length() const
{
return _region->length() - (_props->region_start - _region->start());
}
framepos_t
WaveView::region_end() const
{
return _props->region_start + region_length();
}
void
WaveView::set_region_start (frameoffset_t start)
{
if (!_region) {
return;
}
if (_props->region_start == start) {
return;
}
begin_change ();
_props->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 ();
_props->region_start = _region->start();
_props->region_end = _region->start() + _region->length();
_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 ();
}
void
WaveView::set_image_cache_size (uint64_t sz)
{
WaveViewCache::get_instance()->set_image_cache_threshold (sz);
}
boost::shared_ptr<WaveViewCacheGroup>
WaveView::get_cache_group () const
{
if (_cache_group) {
return _cache_group;
}
boost::shared_ptr<AudioSource> source = _region->audio_source (_props->channel);
assert (source);
_cache_group = WaveViewCache::get_instance ()->get_cache_group (source);
return _cache_group;
}
void
WaveView::reset_cache_group ()
{
WaveViewCache::get_instance()->reset_cache_group (_cache_group);
}
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