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use Canvas::Curve for drawing xfades

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Pixel-by-pixel we shall rule the earth.
This commit is contained in:
Paul Davis 2014-02-26 18:45:24 -05:00
parent 230afc09ff
commit 344f326919
2 changed files with 116 additions and 141 deletions
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225
gtk2_ardour/audio_region_view.cc
View File

@ -43,6 +43,7 @@
#include "canvas/poly_line.h" #include "canvas/poly_line.h"
#include "canvas/line.h" #include "canvas/line.h"
#include "canvas/text.h" #include "canvas/text.h"
#include "canvas/curve.h"
#include "canvas/debug.h" #include "canvas/debug.h"
#include "canvas/utils.h" #include "canvas/utils.h"
@ -78,8 +79,6 @@ AudioRegionView::AudioRegionView (ArdourCanvas::Group *parent, RouteTimeAxisView
Gdk::Color const & basic_color) Gdk::Color const & basic_color)
: RegionView (parent, tv, r, spu, basic_color) : RegionView (parent, tv, r, spu, basic_color)
, sync_mark(0) , sync_mark(0)
, fade_in_shape(0)
, fade_out_shape(0)
, fade_in_handle(0) , fade_in_handle(0)
, fade_out_handle(0) , fade_out_handle(0)
, start_xfade_in (0) , start_xfade_in (0)
@ -100,8 +99,6 @@ AudioRegionView::AudioRegionView (ArdourCanvas::Group *parent, RouteTimeAxisView
Gdk::Color const & basic_color, bool recording, TimeAxisViewItem::Visibility visibility) Gdk::Color const & basic_color, bool recording, TimeAxisViewItem::Visibility visibility)
: RegionView (parent, tv, r, spu, basic_color, recording, visibility) : RegionView (parent, tv, r, spu, basic_color, recording, visibility)
, sync_mark(0) , sync_mark(0)
, fade_in_shape(0)
, fade_out_shape(0)
, fade_in_handle(0) , fade_in_handle(0)
, fade_out_handle(0) , fade_out_handle(0)
, start_xfade_in (0) , start_xfade_in (0)
@ -120,8 +117,6 @@ AudioRegionView::AudioRegionView (ArdourCanvas::Group *parent, RouteTimeAxisView
AudioRegionView::AudioRegionView (const AudioRegionView& other, boost::shared_ptr<AudioRegion> other_region) AudioRegionView::AudioRegionView (const AudioRegionView& other, boost::shared_ptr<AudioRegion> other_region)
: RegionView (other, boost::shared_ptr<Region> (other_region)) : RegionView (other, boost::shared_ptr<Region> (other_region))
, fade_in_shape(0)
, fade_out_shape(0)
, fade_in_handle(0) , fade_in_handle(0)
, fade_out_handle(0) , fade_out_handle(0)
, start_xfade_in (0) , start_xfade_in (0)
@ -160,16 +155,6 @@ AudioRegionView::init (Gdk::Color const & basic_color, bool wfd)
create_waves (); create_waves ();
fade_in_shape = new ArdourCanvas::PolyLine (group);
CANVAS_DEBUG_NAME (fade_in_shape, string_compose ("fade in shape for %1", region()->name()));
fade_in_shape->set_outline_color (fade_color);
fade_in_shape->set_data ("regionview", this);
fade_out_shape = new ArdourCanvas::PolyLine (group);
CANVAS_DEBUG_NAME (fade_out_shape, string_compose ("fade out shape for %1", region()->name()));
fade_out_shape->set_outline_color (fade_color);
fade_out_shape->set_data ("regionview", this);
if (!_recregion) { if (!_recregion) {
fade_in_handle = new ArdourCanvas::Rectangle (group); fade_in_handle = new ArdourCanvas::Rectangle (group);
CANVAS_DEBUG_NAME (fade_in_handle, string_compose ("fade in handle for %1", region()->name())); CANVAS_DEBUG_NAME (fade_in_handle, string_compose ("fade in handle for %1", region()->name()));
@ -219,13 +204,10 @@ AudioRegionView::init (Gdk::Color const & basic_color, bool wfd)
reset_width_dependent_items (_pixel_width); reset_width_dependent_items (_pixel_width);
fade_in_shape->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_in_event), fade_in_shape, this));
if (fade_in_handle) { if (fade_in_handle) {
fade_in_handle->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_in_handle_event), fade_in_handle, this)); fade_in_handle->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_in_handle_event), fade_in_handle, this));
} }
fade_out_shape->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_out_event), fade_out_shape, this));
if (fade_out_handle) { if (fade_out_handle) {
fade_out_handle->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_out_handle_event), fade_out_handle, this)); fade_out_handle->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_fade_out_handle_event), fade_out_handle, this));
} }
@ -314,24 +296,24 @@ AudioRegionView::fade_out_changed ()
void void
AudioRegionView::fade_in_active_changed () AudioRegionView::fade_in_active_changed ()
{ {
if (start_xfade_rect) {
if (audio_region()->fade_in_active()) { if (audio_region()->fade_in_active()) {
/* XXX: make a themable colour */ start_xfade_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_ActiveCrossfade());
fade_in_shape->set_outline_color (RGBA_TO_UINT (45, 45, 45, 90));
} else { } else {
/* XXX: make a themable colour */ start_xfade_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_InactiveCrossfade());
fade_in_shape->set_outline_color (RGBA_TO_UINT (45, 45, 45, 20)); }
} }
} }
void void
AudioRegionView::fade_out_active_changed () AudioRegionView::fade_out_active_changed ()
{ {
if (end_xfade_rect) {
if (audio_region()->fade_out_active()) { if (audio_region()->fade_out_active()) {
/* XXX: make a themable colour */ end_xfade_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_ActiveCrossfade());
fade_out_shape->set_outline_color (RGBA_TO_UINT (45, 45, 45, 90));
} else { } else {
/* XXX: make a themable colour */ end_xfade_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_InactiveCrossfade());
fade_out_shape->set_outline_color (RGBA_TO_UINT (45, 45, 45, 20)); }
} }
} }
@ -552,19 +534,15 @@ AudioRegionView::reset_fade_in_shape_width (boost::shared_ptr<AudioRegion> ar, f
if (pwidth < 5) { if (pwidth < 5) {
hide_start_xfade(); hide_start_xfade();
fade_in_shape->hide();
return; return;
} }
if (trackview.session()->config.get_show_region_fades()) { if (!trackview.session()->config.get_show_region_fades()) {
fade_in_shape->show(); hide_start_xfade ();
return;
} }
uint32_t npoints = std::min (gdk_screen_width(), (int) pwidth);
double effective_height; double effective_height;
std::vector<float> curve(npoints);
audio_region()->fade_in()->curve().get_vector (0, audio_region()->fade_in()->back()->when, &curve[0], npoints);
if (_height >= NAME_HIGHLIGHT_THRESH) { if (_height >= NAME_HIGHLIGHT_THRESH) {
effective_height = _height - NAME_HIGHLIGHT_SIZE; effective_height = _height - NAME_HIGHLIGHT_SIZE;
@ -572,33 +550,31 @@ AudioRegionView::reset_fade_in_shape_width (boost::shared_ptr<AudioRegion> ar, f
effective_height = _height; effective_height = _height;
} }
effective_height -= 1.0;
Points points;
points.assign (npoints, Duple());
/* points *MUST* be in anti-clockwise order */ /* points *MUST* be in anti-clockwise order */
uint32_t pi, pc; Points points;
double xdelta = pwidth/npoints; Points::size_type npoints;
Points::size_type pi;
boost::shared_ptr<const Evoral::ControlList> list (audio_region()->fade_in());
Evoral::ControlList::const_iterator x;
double length = list->length();
npoints = list->size();
for (pi = 0, pc = 0; pc < npoints; ++pc) { points.assign (list->size(), Duple());
points[pi].x = 1.0 + (pc * xdelta);
points[pi++].y = 1.0 + effective_height - (curve[pc] * effective_height); for (x = list->begin(), pi = 0; x != list->end(); ++x, ++pi) {
points[pi].x = 1.0 + (pwidth * ((*x)->when/length));
points[pi].y = effective_height - ((*x)->value * effective_height);
} }
/* draw the line */ /* draw the line */
redraw_start_xfade_to (ar, width, points, effective_height, handle_left); redraw_start_xfade_to (ar, width, points, effective_height, handle_left);
// fade_in_shape->set (points);
/* ensure trim handle stays on top */ /* ensure trim handle stays on top */
if (frame_handle_start) { if (frame_handle_start) {
frame_handle_start->raise_to_top(); frame_handle_start->raise_to_top();
} }
} }
void void
@ -624,7 +600,7 @@ AudioRegionView::reset_fade_out_shape_width (boost::shared_ptr<AudioRegion> ar,
* width is zero. Hence the additional + 1.0 at the end. * width is zero. Hence the additional + 1.0 at the end.
*/ */
double const handle_right = trackview.editor().sample_to_pixel (_region->length()) + TimeAxisViewItem::RIGHT_EDGE_SHIFT - pwidth + 1.0; double const handle_right = trackview.editor().sample_to_pixel (_region->length()) + TimeAxisViewItem::RIGHT_EDGE_SHIFT - pwidth;
/* Put the fade out handle so that its right side is at the end-of-fade line; /* Put the fade out handle so that its right side is at the end-of-fade line;
*/ */
@ -635,19 +611,15 @@ AudioRegionView::reset_fade_out_shape_width (boost::shared_ptr<AudioRegion> ar,
if (pwidth < 5) { if (pwidth < 5) {
hide_end_xfade(); hide_end_xfade();
fade_out_shape->hide();
return; return;
} }
if (trackview.session()->config.get_show_region_fades()) { if (!trackview.session()->config.get_show_region_fades()) {
fade_out_shape->show(); hide_end_xfade();
return;
} }
uint32_t npoints = std::min (gdk_screen_width(), (int) pwidth);
double effective_height; double effective_height;
std::vector<float> curve(npoints);
audio_region()->fade_out()->curve().get_vector (0, audio_region()->fade_out()->back()->when, &curve[0], npoints);
if (_height >= NAME_HIGHLIGHT_THRESH) { if (_height >= NAME_HIGHLIGHT_THRESH) {
effective_height = _height - NAME_HIGHLIGHT_SIZE; effective_height = _height - NAME_HIGHLIGHT_SIZE;
@ -655,33 +627,31 @@ AudioRegionView::reset_fade_out_shape_width (boost::shared_ptr<AudioRegion> ar,
effective_height = _height; effective_height = _height;
} }
effective_height -= 1.0;
/* points *MUST* be in anti-clockwise order */ /* points *MUST* be in anti-clockwise order */
Points points; Points points;
Points::size_type npoints;
Points::size_type pi;
boost::shared_ptr<const Evoral::ControlList> list (audio_region()->fade_out());
Evoral::ControlList::const_iterator x;
double length = list->length();
npoints = list->size();
uint32_t pi, pc; points.assign (list->size(), Duple());
double xdelta = pwidth/npoints;
points.assign (npoints, Duple ()); for (x = list->begin(), pi = 0; x != list->end(); ++x, ++pi) {
points[pi].x = 1.0 + _pixel_width - pwidth + (pwidth * ((*x)->when/length));
for (pi = 0, pc = 0; pc < npoints; ++pc, ++pi) { points[pi].y = effective_height - ((*x)->value * effective_height);
points[pi].x = 1.0 + _pixel_width - pwidth + (pc * xdelta);
points[pi].y = 1.0 + effective_height - (curve[pc] * effective_height);
} }
/* draw the line */ /* draw the line */
redraw_end_xfade_to (ar, width, points, effective_height, handle_right, pwidth-1); redraw_end_xfade_to (ar, width, points, effective_height, handle_right, pwidth);
// fade_out_shape->set (points);
/* ensure trim handle stays on top */ /* ensure trim handle stays on top */
if (frame_handle_end) { if (frame_handle_end) {
frame_handle_end->raise_to_top(); frame_handle_end->raise_to_top();
} }
} }
framepos_t framepos_t
@ -714,23 +684,25 @@ void
AudioRegionView::redraw_start_xfade_to (boost::shared_ptr<AudioRegion> ar, framecnt_t /*width*/, Points& points, double effective_height, AudioRegionView::redraw_start_xfade_to (boost::shared_ptr<AudioRegion> ar, framecnt_t /*width*/, Points& points, double effective_height,
double rect_width) double rect_width)
{ {
if (points.size() < 3) { if (points.size() < 2) {
return; return;
} }
if (!start_xfade_in) { if (!start_xfade_in) {
start_xfade_in = new ArdourCanvas::PolyLine (group); start_xfade_in = new ArdourCanvas::Curve (group);
CANVAS_DEBUG_NAME (start_xfade_in, string_compose ("xfade start in line for %1", region()->name())); CANVAS_DEBUG_NAME (start_xfade_in, string_compose ("xfade start in line for %1", region()->name()));
start_xfade_in->set_outline_color (ARDOUR_UI::config()->get_canvasvar_CrossfadeLine()); start_xfade_in->set_outline_color (ARDOUR_UI::config()->get_canvasvar_CrossfadeLine());
start_xfade_in->set_outline_width (1.5); start_xfade_in->set_outline_width (1.5);
start_xfade_in->set_ignore_events (true);
} }
if (!start_xfade_out) { if (!start_xfade_out) {
start_xfade_out = new ArdourCanvas::PolyLine (group); start_xfade_out = new ArdourCanvas::Curve (group);
CANVAS_DEBUG_NAME (start_xfade_out, string_compose ("xfade start out line for %1", region()->name())); CANVAS_DEBUG_NAME (start_xfade_out, string_compose ("xfade start out line for %1", region()->name()));
uint32_t col = UINT_RGBA_CHANGE_A (ARDOUR_UI::config()->get_canvasvar_CrossfadeLine(), 128); uint32_t col = UINT_RGBA_CHANGE_A (ARDOUR_UI::config()->get_canvasvar_CrossfadeLine(), 128);
start_xfade_out->set_outline_color (col); start_xfade_out->set_outline_color (col);
start_xfade_out->set_outline_width (2.0); start_xfade_out->set_outline_width (2.0);
start_xfade_out->set_ignore_events (true);
} }
if (!start_xfade_rect) { if (!start_xfade_rect) {
@ -744,44 +716,53 @@ AudioRegionView::redraw_start_xfade_to (boost::shared_ptr<AudioRegion> ar, frame
} }
start_xfade_rect->set (ArdourCanvas::Rect (1.0, 0.0, rect_width, effective_height)); start_xfade_rect->set (ArdourCanvas::Rect (1.0, 0.0, rect_width, effective_height));
start_xfade_rect->show ();
start_xfade_in->set (points); start_xfade_in->set (points);
start_xfade_in->show ();
/* fade out line */ /* fade out line */
boost::shared_ptr<AutomationList> inverse = ar->inverse_fade_in (); boost::shared_ptr<AutomationList> inverse = ar->inverse_fade_in ();
Points ipoints; Points ipoints;
Points::size_type npoints = points.size(); Points::size_type npoints;
ipoints.assign (npoints, Duple());
if (!inverse) { if (!inverse) {
/* no inverse curve defined, show the inverse of the normal one */ /* there is no explicit inverse fade in curve, so take the
* regular fade in curve given to use as "points" (already a
* set of coordinates), and convert to the inverse shape.
*/
npoints = points.size();
ipoints.assign (npoints, Duple());
for (Points::size_type i = 0, pci = 0; i < npoints; ++i, ++pci) { for (Points::size_type i = 0, pci = 0; i < npoints; ++i, ++pci) {
ArdourCanvas::Duple &p (ipoints[pci]); ArdourCanvas::Duple &p (ipoints[pci]);
p.x = 1.0 + i; /* leave x-axis alone but invert with respect to y-axis */
/* invert with respect to y-axis */ p.y = effective_height - points[pci].y;
p.y = 1.0 + effective_height - points[pci].y;
} }
} else { } else {
std::vector<float> vec(npoints); /* there is an explicit inverse fade in curve. Grab the points
inverse->curve().get_vector (0, inverse->back()->when, &vec[0], npoints); and convert them into coordinates for the inverse fade in
line.
*/
for (Points::size_type i = 0, pci = 0; i < npoints; ++i, ++pci) { npoints = inverse->size();
ArdourCanvas::Duple &p (ipoints[pci]); ipoints.assign (npoints, Duple());
p.x = 1.0 + i;
p.y = 1.0 + effective_height - (effective_height * vec[i]); Evoral::ControlList::const_iterator x;
Points::size_type pi;
double length = inverse->length();
for (x = inverse->begin(), pi = 0; x != inverse->end(); ++x, ++pi) {
ArdourCanvas::Duple& p (ipoints[pi]);
p.x = 1.0 + (rect_width * ((*x)->when/length));
p.y = effective_height - ((*x)->value * effective_height);
} }
} }
start_xfade_out->set (ipoints); start_xfade_out->set (ipoints);
start_xfade_out->show ();
show_start_xfade(); show_start_xfade();
} }
@ -804,23 +785,25 @@ void
AudioRegionView::redraw_end_xfade_to (boost::shared_ptr<AudioRegion> ar, framecnt_t width, Points& points, double effective_height, AudioRegionView::redraw_end_xfade_to (boost::shared_ptr<AudioRegion> ar, framecnt_t width, Points& points, double effective_height,
double rect_edge, double rect_width) double rect_edge, double rect_width)
{ {
if (points.size() < 3) { if (points.size() < 2) {
return; return;
} }
if (!end_xfade_in) { if (!end_xfade_in) {
end_xfade_in = new ArdourCanvas::PolyLine (group); end_xfade_in = new ArdourCanvas::Curve (group);
CANVAS_DEBUG_NAME (end_xfade_in, string_compose ("xfade end in line for %1", region()->name())); CANVAS_DEBUG_NAME (end_xfade_in, string_compose ("xfade end in line for %1", region()->name()));
uint32_t col UINT_RGBA_CHANGE_A (ARDOUR_UI::config()->get_canvasvar_CrossfadeLine(), 128); uint32_t col UINT_RGBA_CHANGE_A (ARDOUR_UI::config()->get_canvasvar_CrossfadeLine(), 128);
end_xfade_in->set_outline_color (col); end_xfade_in->set_outline_color (col);
end_xfade_in->set_outline_width (1.5); end_xfade_in->set_outline_width (1.5);
end_xfade_in->set_ignore_events (true);
} }
if (!end_xfade_out) { if (!end_xfade_out) {
end_xfade_out = new ArdourCanvas::PolyLine (group); end_xfade_out = new ArdourCanvas::Curve (group);
CANVAS_DEBUG_NAME (end_xfade_out, string_compose ("xfade end out line for %1", region()->name())); CANVAS_DEBUG_NAME (end_xfade_out, string_compose ("xfade end out line for %1", region()->name()));
end_xfade_out->set_outline_color (ARDOUR_UI::config()->get_canvasvar_CrossfadeLine()); end_xfade_out->set_outline_color (ARDOUR_UI::config()->get_canvasvar_CrossfadeLine());
end_xfade_out->set_outline_width (2.0); end_xfade_out->set_outline_width (2.0);
end_xfade_out->set_ignore_events (true);
} }
if (!end_xfade_rect) { if (!end_xfade_rect) {
@ -834,51 +817,57 @@ AudioRegionView::redraw_end_xfade_to (boost::shared_ptr<AudioRegion> ar, framecn
} }
end_xfade_rect->set (ArdourCanvas::Rect (rect_edge, 0.0, rect_edge + rect_width + TimeAxisViewItem::RIGHT_EDGE_SHIFT, effective_height)); end_xfade_rect->set (ArdourCanvas::Rect (rect_edge, 0.0, rect_edge + rect_width + TimeAxisViewItem::RIGHT_EDGE_SHIFT, effective_height));
end_xfade_rect->show ();
end_xfade_in->set (points); end_xfade_in->set (points);
end_xfade_in->show ();
end_xfade_in->raise_to_top ();
/* fade in line */ /* fade in line */
boost::shared_ptr<AutomationList> inverse = ar->inverse_fade_out (); boost::shared_ptr<AutomationList> inverse = ar->inverse_fade_out ();
Points ipoints; Points ipoints;
Points::size_type npoints = points.size(); Points::size_type npoints;
ipoints.assign (npoints, Duple());
if (!inverse) { if (!inverse) {
const double rend = trackview.editor().sample_to_pixel (_region->length() - points.back().y); /* there is no explicit inverse fade out curve, so take the
* regular fade out curve given to use as "points" (already a
* set of coordinates), and convert to the inverse shape.
*/
for (Points::size_type i = 0, pci = 0; i < npoints; ++i, ++pci) { npoints = points.size();
ipoints.assign (npoints, Duple());
Points::size_type pci;
for (pci = 0; pci < npoints; ++pci) {
ArdourCanvas::Duple &p (ipoints[pci]); ArdourCanvas::Duple &p (ipoints[pci]);
p.x = 1.0 + rend + i; p.y = effective_height - points[pci].y;
p.y = 1.0 + effective_height - points[pci].y;
} }
} else { } else {
boost::scoped_array<float> vec (new float[npoints]); /* there is an explicit inverse fade out curve. Grab the points
inverse->curve().get_vector (inverse->front()->when, inverse->back()->when, vec.get(), npoints); and convert them into coordinates for the inverse fade out
line.
*/
npoints = inverse->size();
ipoints.assign (npoints, Duple());
const double rend = trackview.editor().sample_to_pixel (_region->length() - width); const double rend = trackview.editor().sample_to_pixel (_region->length() - width);
float* vp = vec.get(); Evoral::ControlList::const_iterator x;
Points::size_type i;
Points::size_type pi;
double length = inverse->length();
for (Points::size_type i = 0, pci = 0; i < npoints; ++i) { for (x = inverse->begin(), i = 0, pi = 0; x != inverse->end(); ++x, ++pi, ++i) {
ArdourCanvas::Duple& p (ipoints[pci++]); ArdourCanvas::Duple& p (ipoints[pi]);
p.x = 1.0 + rend + i; p.x = 1.0 + (rect_width * ((*x)->when/length)) + rend;
p.y = 1.0 + effective_height - (effective_height * vp[i]); p.y = effective_height - ((*x)->value * effective_height);
} }
} }
end_xfade_out->set (ipoints); end_xfade_out->set (ipoints);
end_xfade_out->show ();
end_xfade_out->raise_to_top ();
end_xfade_rect->raise_to_top (); //this needs to be topmost so the lines don't steal mouse focus
show_end_xfade(); show_end_xfade();
} }
@ -1475,12 +1464,6 @@ void
AudioRegionView::set_fade_visibility (bool yn) AudioRegionView::set_fade_visibility (bool yn)
{ {
if (yn) { if (yn) {
if (fade_in_shape) {
fade_in_shape->show();
}
if (fade_out_shape) {
fade_out_shape->show ();
}
if (fade_in_handle) { if (fade_in_handle) {
fade_in_handle->show (); fade_in_handle->show ();
} }
@ -1488,12 +1471,6 @@ AudioRegionView::set_fade_visibility (bool yn)
fade_out_handle->show (); fade_out_handle->show ();
} }
} else { } else {
if (fade_in_shape) {
fade_in_shape->hide();
}
if (fade_out_shape) {
fade_out_shape->hide ();
}
if (fade_in_handle) { if (fade_in_handle) {
fade_in_handle->hide (); fade_in_handle->hide ();
} }

10
gtk2_ardour/audio_region_view.h
View File

@ -155,18 +155,16 @@ class AudioRegionView : public RegionView
std::list<std::pair<framepos_t, ArdourCanvas::Line*> > feature_lines; std::list<std::pair<framepos_t, ArdourCanvas::Line*> > feature_lines;
ArdourCanvas::Polygon* sync_mark; ///< polgyon for sync position ArdourCanvas::Polygon* sync_mark; ///< polgyon for sync position
ArdourCanvas::PolyLine* fade_in_shape;
ArdourCanvas::PolyLine* fade_out_shape;
ArdourCanvas::Rectangle* fade_in_handle; ///< fade in handle, or 0 ArdourCanvas::Rectangle* fade_in_handle; ///< fade in handle, or 0
ArdourCanvas::Rectangle* fade_out_handle; ///< fade out handle, or 0 ArdourCanvas::Rectangle* fade_out_handle; ///< fade out handle, or 0
ArdourCanvas::PolyLine *start_xfade_in; ArdourCanvas::Curve* start_xfade_in;
ArdourCanvas::PolyLine *start_xfade_out; ArdourCanvas::Curve* start_xfade_out;
ArdourCanvas::Rectangle* start_xfade_rect; ArdourCanvas::Rectangle* start_xfade_rect;
bool _start_xfade_visible; bool _start_xfade_visible;
ArdourCanvas::PolyLine *end_xfade_in; ArdourCanvas::Curve *end_xfade_in;
ArdourCanvas::PolyLine *end_xfade_out; ArdourCanvas::Curve *end_xfade_out;
ArdourCanvas::Rectangle* end_xfade_rect; ArdourCanvas::Rectangle* end_xfade_rect;
bool _end_xfade_visible; bool _end_xfade_visible;