rename spline-widget -> spline

Adjust usages.

11 files changed, 1523 insertions, 0 deletions

diff --git a/spline/CMakeLists.txt b/spline/CMakeLists.txt
new file mode 100644
index 00000000..d252004b
--- /dev/null
+++ b/spline/CMakeLists.txt
@@ -0,0 +1,2 @@
+otr_module(spline NO-COMPAT BIN)
+target_link_libraries(opentrack-spline opentrack-options opentrack-compat)
diff --git a/spline/broken/qfunctionconfiguratorplugin.cpp b/spline/broken/qfunctionconfiguratorplugin.cpp
new file mode 100644
index 00000000..1a9da10a
--- /dev/null
+++ b/spline/broken/qfunctionconfiguratorplugin.cpp
@@ -0,0 +1,111 @@
+/* Copyright (c) 2011-2012 Stanislaw Halik <sthalik@misaki.pl>
+ *                         Adapted to FaceTrackNoIR by Wim Vriend.
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+#include "qfunctionconfigurator.h"
+
+#include <QtCore/QtPlugin>
+#include "qfunctionconfiguratorplugin.h"
+
+
+QFunctionConfiguratorPlugin::QFunctionConfiguratorPlugin(QObject *parent)
+	: QObject(parent)
+{
+	initialized = false;
+}
+
+void QFunctionConfiguratorPlugin::initialize(QDesignerFormEditorInterface *)
+{
+	if (initialized)
+		return;
+
+	initialized = true;
+}
+
+bool QFunctionConfiguratorPlugin::isInitialized() const
+{
+	return initialized;
+}
+
+QWidget *QFunctionConfiguratorPlugin::createWidget(QWidget *parent)
+{
+	return new QFunctionConfigurator(parent);
+}
+
+QString QFunctionConfiguratorPlugin::name() const
+{
+	return "QFunctionConfigurator";
+}
+
+QString QFunctionConfiguratorPlugin::group() const
+{
+	return "My Plugins";
+}
+
+QIcon QFunctionConfiguratorPlugin::icon() const
+{
+	return QIcon();
+}
+
+QString QFunctionConfiguratorPlugin::toolTip() const
+{
+	return QString();
+}
+
+QString QFunctionConfiguratorPlugin::whatsThis() const
+{
+	return QString();
+}
+
+bool QFunctionConfiguratorPlugin::isContainer() const
+{
+	return false;
+}
+
+QString QFunctionConfiguratorPlugin::domXml() const
+{
+	return "<widget class=\"QFunctionConfigurator\" name=\"qFunctionA\">\n"
+		" <property name=\"geometry\">\n"
+		"  <rect>\n"
+		"   <x>0</x>\n"
+		"   <y>0</y>\n"
+		"   <width>161</width>\n"
+		"   <height>220</height>\n"
+		"  </rect>\n"
+		" </property>\n"
+		" <property name=\"colorBezier\">\n"
+		"  <color>\n"
+		"   <red>255</red>\n"
+		"   <green>170</green>\n"
+		"   <blue>0</blue>\n"
+		"  </color>\n"
+		" </property>\n"
+		" <property name=\"stringInputEGU\" stdset=\"0\">\n"
+		"  <string>Input Yaw (degr.)</string>\n"
+		" </property>\n"
+		" <property name=\"stringOutputEGU\" stdset=\"0\">\n"
+		"  <string>Output Yaw (degr.)</string>\n"
+		" </property>\n"
+		" <property name=\"maxInputEGU\" stdset=\"0\">\n"
+		" <number>50</number>\n"
+		" </property>\n"
+		" <property name=\"maxOutputEGU\" stdset=\"0\">\n"
+		" <number>180</number>\n"
+		" </property>\n"
+		" <property name=\"pixPerEGU_Input\" stdset=\"0\">\n"
+		" <number>2</number>\n"
+		" </property>\n"
+		" <property name=\"pixPerEGU_Output\" stdset=\"0\">\n"
+		" <number>1</number>\n"
+		" </property>\n"
+	   "</widget>\n";
+}
+
+QString QFunctionConfiguratorPlugin::includeFile() const
+{
+	return "qfunctionconfigurator.h";
+}
+
+Q_EXPORT_PLUGIN2(qfunctionconfigurator, QFunctionConfiguratorPlugin)
diff --git a/spline/broken/qfunctionconfiguratorplugin.h b/spline/broken/qfunctionconfiguratorplugin.h
new file mode 100644
index 00000000..ca68e0e2
--- /dev/null
+++ b/spline/broken/qfunctionconfiguratorplugin.h
@@ -0,0 +1,36 @@
+/* Copyright (c) 2011-2012 Stanislaw Halik <sthalik@misaki.pl>
+ *                         Adapted to FaceTrackNoIR by Wim Vriend.
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+#ifndef QFUNCTIONCONFIGURATORPLUGIN_H
+#define QFUNCTIONCONFIGURATORPLUGIN_H
+
+#include <QDesignerCustomWidgetInterface>
+
+class QFunctionConfiguratorPlugin : public QObject, public QDesignerCustomWidgetInterface
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QDesignerCustomWidgetInterface" FILE "analogclock.json")
+    Q_INTERFACES(QDesignerCustomWidgetInterface)
+
+public:
+    QFunctionConfiguratorPlugin(QObject *parent = 0);
+
+    bool isContainer() const;
+    bool isInitialized() const;
+    QIcon icon() const;
+    QString domXml() const;
+    QString group() const;
+    QString includeFile() const;
+    QString name() const;
+    QString toolTip() const;
+    QString whatsThis() const;
+    QWidget *createWidget(QWidget *parent);
+    void initialize(QDesignerFormEditorInterface *core);
+private:
+    bool initialized;
+};
+
+#endif // QFUNCTIONCONFIGURATORPLUGIN_H
diff --git a/spline/export.hpp b/spline/export.hpp
new file mode 100644
index 00000000..4875b4c1
--- /dev/null
+++ b/spline/export.hpp
@@ -0,0 +1,27 @@
+#pragma once
+
+#ifdef BUILD_spline_widget
+#   ifdef _WIN32
+#       define OPENTRACK_SPLINE_LINKAGE __declspec(dllexport)
+#   else
+#       define OPENTRACK_SPLINE_LINKAGE
+#   endif
+
+#   ifndef _MSC_VER
+#       define OPENTRACK_SPLINE_EXPORT __attribute__ ((visibility ("default"))) OPENTRACK_SPLINE_LINKAGE
+#   else
+#       define OPENTRACK_SPLINE_EXPORT OPENTRACK_SPLINE_LINKAGE
+#   endif
+#else
+    #ifdef _WIN32
+    #    define OPENTRACK_SPLINE_LINKAGE __declspec(dllimport)
+    #else
+    #    define OPENTRACK_SPLINE_LINKAGE
+    #endif
+
+    #ifndef _MSC_VER
+    #    define OPENTRACK_SPLINE_EXPORT __attribute__ ((visibility ("default"))) OPENTRACK_SPLINE_LINKAGE
+    #else
+    #    define OPENTRACK_SPLINE_EXPORT OPENTRACK_SPLINE_LINKAGE
+    #endif
+#endif
diff --git a/spline/lang/nl_NL.ts b/spline/lang/nl_NL.ts
new file mode 100644
index 00000000..9e739505
--- /dev/null
+++ b/spline/lang/nl_NL.ts
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="nl_NL">
+</TS>
diff --git a/spline/lang/ru_RU.ts b/spline/lang/ru_RU.ts
new file mode 100644
index 00000000..f62cf2e1
--- /dev/null
+++ b/spline/lang/ru_RU.ts
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1" language="ru_RU">
+</TS>
diff --git a/spline/lang/stub.ts b/spline/lang/stub.ts
new file mode 100644
index 00000000..6401616d
--- /dev/null
+++ b/spline/lang/stub.ts
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1">
+</TS>
diff --git a/spline/spline-widget.cpp b/spline/spline-widget.cpp
new file mode 100644
index 00000000..c7dd5e5a
--- /dev/null
+++ b/spline/spline-widget.cpp
@@ -0,0 +1,652 @@
+/* Copyright (c) 2012-2016 Stanislaw Halik <sthalik@misaki.pl>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+
+#include "compat/util.hpp"
+#include "spline-widget.hpp"
+#include <QPainter>
+#include <QPainterPath>
+#include <QPaintEvent>
+#include <QPen>
+#include <QPixmap>
+#include <QList>
+#include <QPoint>
+#include <QString>
+#include <QRect>
+#include <QApplication>
+#include <QStyle>
+#include <QMouseEvent>
+
+#include <QDebug>
+
+#include <cmath>
+#include <algorithm>
+
+spline_widget::spline_widget(QWidget *parent) :
+    QWidget(parent),
+    _config(nullptr),
+    snap_x(0),
+    snap_y(0),
+    _x_step(10),
+    _y_step(10),
+    moving_control_point_idx(-1),
+    _draw_function(true),
+    _preview_only(false)
+{
+    setMouseTracking(true);
+    setFocusPolicy(Qt::ClickFocus);
+    setCursor(Qt::ArrowCursor);
+}
+
+spline_widget::~spline_widget()
+{
+    if (connection)
+        QObject::disconnect(connection);
+}
+
+void spline_widget::setConfig(spline* spl)
+{
+    if (spl != _config)
+    {
+        if (connection)
+        {
+            QObject::disconnect(connection);
+            connection = QMetaObject::Connection();
+        }
+
+        if (spl)
+        {
+            mem<spline::settings> s = spl->get_settings();
+            connection = connect(s.get(), &spline::settings::recomputed,
+                                 this, [this]() { reload_spline(); },
+                                 Qt::QueuedConnection);
+        }
+
+        _config = spl;
+        _background = QPixmap();
+        update_range();
+    }
+}
+
+QColor spline_widget::colorBezier() const
+{
+    return spline_color;
+}
+
+void spline_widget::setColorBezier(QColor color)
+{
+    spline_color = color;
+    update();
+}
+
+void spline_widget::force_redraw()
+{
+    _background = QPixmap();
+    update();
+}
+
+void spline_widget::set_preview_only(bool val)
+{
+    _preview_only = val;
+}
+
+bool spline_widget::is_preview_only() const
+{
+    return _preview_only;
+}
+
+void spline_widget::drawBackground()
+{
+    _background = QPixmap(width(), height());
+
+    QPainter painter(&_background);
+
+    painter.fillRect(rect(), palette().color(QPalette::Light));
+
+    QColor bg_color(112, 154, 209);
+    if (!isEnabled() && !_preview_only)
+        bg_color = QColor(176,176,180);
+    painter.fillRect(pixel_bounds, bg_color);
+
+    QFont font;
+    font.setPointSize(8);
+    painter.setFont(font);
+    QFontMetrics metrics(font);
+
+    QColor color__(176, 190, 209, 127);
+
+    if (!isEnabled())
+        color__ = QColor(70, 90, 100, 96);
+
+    const QPen pen(color__, 1, Qt::SolidLine, Qt::FlatCap);
+
+    const int ystep = _y_step, xstep = _x_step;
+    const qreal maxx = _config->max_input();
+    const qreal maxy = _config->max_output();
+
+    // horizontal grid
+    for (int i = 0; i <= maxy; i += ystep)
+    {
+        const int y = int(pixel_bounds.height() - i * c.y() + pixel_bounds.y());
+        drawLine(painter,
+                 QPoint(pixel_bounds.x(), y),
+                 QPoint(pixel_bounds.x() + pixel_bounds.width(), y),
+                 pen);
+        painter.drawText(QRectF(10,
+                                y - metrics.height()/2.,
+                                pixel_bounds.left(),
+                                metrics.height()),
+                         QString::number(i));
+    }
+
+    // vertical grid
+    for (int i = 0; i <= maxx; i += xstep)
+    {
+        const int x = iround(pixel_bounds.x() + i * c.x());
+        drawLine(painter,
+                 QPoint(x, pixel_bounds.y()),
+                 QPoint(x, pixel_bounds.y() + pixel_bounds.height()),
+                 pen);
+        const QString text = QString::number(i);
+        painter.drawText(QRectF(x - metrics.width(text)/2.,
+                                pixel_bounds.height() + 10 + metrics.height(),
+                                metrics.width(text),
+                                metrics.height()),
+                         text);
+    }
+}
+
+void spline_widget::drawFunction()
+{
+    _function = _background;
+    QPainter painter(&_function);
+    painter.setRenderHint(QPainter::Antialiasing, true);
+
+    const points_t points = _config->get_points();
+
+    if (moving_control_point_idx >= 0 &&
+        moving_control_point_idx < points.size())
+    {
+        const QPen pen(Qt::white, 1, Qt::SolidLine, Qt::FlatCap);
+        const QPointF prev_ = point_to_pixel(QPointF(0, 0));
+        QPoint prev(iround(prev_.x()), iround(prev_.y()));
+        for (int i = 0; i < points.size(); i++)
+        {
+            const QPointF tmp_ = point_to_pixel(points[i]);
+            const QPoint tmp(iround(tmp_.x()), iround(tmp_.y()));
+            drawLine(painter, prev, tmp, pen);
+            prev = tmp;
+        }
+    }
+
+    const QColor color = progn
+                         (
+                             if (!isEnabled() && !_preview_only)
+                             {
+                                 QColor color(spline_color);
+                                 const int avg = int(float(color.red() + color.green() + color.blue())/3);
+                                 return QColor(int(float(color.red() + avg) * .5f),
+                                               int(float(color.green() + avg) * .5f),
+                                               int(float(color.blue() + avg) * .5f),
+                                               96);
+                             }
+                             else
+                             {
+                                 QColor color(spline_color);
+                                 color.setAlphaF(color.alphaF() * .9);
+                                 return color;
+                             }
+                         );
+
+    painter.setPen(QPen(color, 1.75, Qt::SolidLine, Qt::FlatCap));
+
+//#define DEBUG_SPLINE
+#ifndef DEBUG_SPLINE
+    static constexpr double step_ = 3./3;
+
+    const double maxx = _config->max_input();
+    const double step = step_ / c.x();
+
+    QPainterPath path;
+
+    path.moveTo(point_to_pixel(QPointF(0, 0)));
+
+    for (double k = 0; k < maxx; k += step*3)
+    {
+        const float next_1(_config->get_value_no_save(k + step*1));
+        const float next_2(_config->get_value_no_save(k + step*2));
+        const float next_3(_config->get_value_no_save(k + step*3));
+
+        const QPointF b(point_to_pixel_(QPointF(k + step*1, qreal(next_1)))),
+                      c(point_to_pixel_(QPointF(k + step*2, qreal(next_2)))),
+                      d(point_to_pixel_(QPointF(k + step*3, qreal(next_3))));
+
+        path.cubicTo(b, c, d);
+    }
+
+    painter.drawPath(path);
+#else
+    static constexpr int line_length_pixels = 3;
+    const qreal max = _config->maxInput();
+    const qreal step = clamp(line_length_pixels / c.x(), 5e-2, max);
+    QPointF prev = point_to_pixel(QPoint(0, 0));
+    for (qreal i = 0; i < max; i += step)
+    {
+        const qreal val = qreal(_config->get_value_no_save(i));
+        const QPointF cur = point_to_pixel(QPointF(i, val));
+        painter.drawLine(prev, cur);
+        prev = cur;
+    }
+    {
+        const qreal maxx = _config->maxInput();
+        const qreal maxy = qreal(_config->get_value_no_save(maxx));
+        painter.drawLine(QPointF(prev), point_to_pixel_(QPointF(maxx, maxy)));
+    }
+#endif
+
+    const int alpha = !isEnabled() ? 64 : 120;
+    if (!_preview_only)
+    {
+        for (int i = 0; i < points.size(); i++)
+        {
+            drawPoint(painter,
+                      point_to_pixel(points[i]),
+                      QColor(200, 200, 210, alpha),
+                      isEnabled() ? QColor(50, 100, 120, 200) : QColor(200, 200, 200, 96));
+        }
+    }
+}
+
+void spline_widget::paintEvent(QPaintEvent *e)
+{
+    if (!_config)
+        return;
+
+    QPainter p(this);
+
+    if (_background.isNull())
+    {
+        _draw_function = true;
+        drawBackground();
+    }
+
+    if (_draw_function)
+    {
+        _draw_function = false;
+        drawFunction();
+    }
+
+    p.drawPixmap(e->rect(), _function);
+
+    // If the Tracker is active, the 'Last Point' it requested is recorded.
+    // Show that point on the graph, with some lines to assist.
+    // This new feature is very handy for tweaking the curves!
+    QPointF last;
+    if (_config->get_last_value(last) && isEnabled())
+        drawPoint(p, point_to_pixel(last), QColor(255, 0, 0, 120));
+}
+
+void spline_widget::drawPoint(QPainter& painter, const QPointF& pos, const QColor& colBG, const QColor& border)
+{
+    painter.save();
+    painter.setPen(QPen(border, 1, Qt::SolidLine, Qt::PenCapStyle::FlatCap));
+    painter.setBrush(colBG);
+    painter.drawEllipse(QRectF(pos.x() - point_size,
+                                pos.y() - point_size,
+                                point_size*2, point_size*2));
+    painter.restore();
+}
+
+void spline_widget::drawLine(QPainter& painter, const QPoint& start, const QPoint& end, const QPen& pen)
+{
+    painter.save();
+    painter.setPen(pen);
+    painter.setBrush(Qt::NoBrush);
+    painter.drawLine(start, end);
+    painter.restore();
+}
+
+void spline_widget::mousePressEvent(QMouseEvent *e)
+{
+    if (!_config || !isEnabled() || !is_in_bounds(e->pos()))
+    {
+        clearFocus();
+        return;
+    }
+
+    const int point_pixel_closeness_limit = get_closeness_limit();
+
+    points_t points = _config->get_points();
+    if (e->button() == Qt::LeftButton)
+    {
+        bool bTouchingPoint = false;
+        moving_control_point_idx = -1;
+        for (int i = 0; i < points.size(); i++)
+        {
+            if (point_within_pixel(points[i], e->pos()))
+            {
+                bTouchingPoint = true;
+                moving_control_point_idx = int(i);
+                break;
+            }
+        }
+        if (!bTouchingPoint)
+        {
+            bool too_close = false;
+            const QPoint pos = e->pos();
+
+            for (int i = 0; i < points.size(); i++)
+            {
+                const QPointF pt = point_to_pixel(points[i]);
+                const qreal x = std::fabs(pt.x() - pos.x());
+                if (point_pixel_closeness_limit >= x)
+                {
+                    too_close = true;
+                    break;
+                }
+            }
+
+            if (!too_close)
+            {
+                _config->add_point(pixel_coord_to_point(e->pos()));
+                show_tooltip(e->pos());
+            }
+        }
+    }
+
+    if (e->button() == Qt::RightButton)
+    {
+        if (_config)
+        {
+            int found_pt = -1;
+            for (int i = 0; i < points.size(); i++)
+            {
+                if (point_within_pixel(points[i], e->pos()))
+                {
+                    found_pt = i;
+                    break;
+                }
+            }
+
+            if (found_pt != -1)
+            {
+                _config->remove_point(found_pt);
+            }
+            moving_control_point_idx = -1;
+        }
+    }
+    _draw_function = true;
+    update();
+}
+
+void spline_widget::mouseMoveEvent(QMouseEvent *e)
+{
+    if (_preview_only && _config)
+    {
+        show_tooltip(e->pos());
+        clearFocus();
+        return;
+    }
+
+    if (!_config || !isEnabled() || !isActiveWindow() || (moving_control_point_idx != -1 && !hasFocus()))
+    {
+        clearFocus();
+        return;
+    }
+
+    const int i = moving_control_point_idx;
+    const points_t points = _config->get_points();
+    const int sz = points.size();
+
+    if (i >= 0 && i < sz)
+    {
+        const int point_pixel_closeness_limit = get_closeness_limit();
+        bool overlap = false;
+
+        const QPoint pix = progn(
+            // takes snap into account
+            const QPointF pix_ = point_to_pixel(pixel_coord_to_point(e->pos()));
+            return QPoint(int(pix_.x()), int(pix_.y()));
+        );
+
+        QPointF new_pt = pixel_coord_to_point(e->pos());
+
+        if (i + 1 < points.size())
+        {
+            const QPointF other_pix = point_to_pixel(points[i+1]);
+            overlap |= other_pix.x() - pix.x() < point_pixel_closeness_limit;
+        }
+        if (i != 0)
+        {
+            const QPointF other_pix = point_to_pixel(points[i-1]);
+            overlap |= pix.x() - other_pix.x() < point_pixel_closeness_limit;
+        }
+
+        if (overlap)
+            new_pt.setX(points[i].x());
+
+        _config->move_point(i, new_pt);
+        _draw_function = true;
+
+        setCursor(Qt::ClosedHandCursor);
+        show_tooltip(pix, new_pt);
+        update();
+    }
+    else if (sz)
+    {
+        int i;
+        bool is_on_point = is_on_pt(e->pos(), &i);
+
+        if (is_on_point)
+        {
+            setCursor(Qt::CrossCursor);
+            show_tooltip(e->pos(), points[i]);
+        }
+        else
+        {
+            setCursor(Qt::ArrowCursor);
+            if (is_in_bounds(e->pos()))
+                show_tooltip(e->pos());
+            else
+                QToolTip::hideText();
+        }
+    }
+}
+
+void spline_widget::mouseReleaseEvent(QMouseEvent *e)
+{
+    if (!_config || !isEnabled() || !isActiveWindow() || !hasFocus())
+    {
+        clearFocus();
+        return;
+    }
+
+    if (e->button() == Qt::LeftButton)
+    {
+        {
+            if (is_on_pt(e->pos(), nullptr))
+                setCursor(Qt::CrossCursor);
+            else
+                setCursor(Qt::ArrowCursor);
+        }
+        moving_control_point_idx = -1;
+        _draw_function = true;
+
+        if (is_in_bounds(e->pos()))
+            show_tooltip(e->pos());
+        else
+            QToolTip::hideText();
+
+        update();
+    }
+}
+
+void spline_widget::reload_spline()
+{
+    // don't recompute here as the value's about to be recomputed in the callee
+    update_range();
+}
+
+int spline_widget::get_closeness_limit()
+{
+    return std::max(iround(snap_x * c.x()), 1);
+}
+
+void spline_widget::show_tooltip(const QPoint& pos, const QPointF& value_)
+{
+    const QPointF value = QPoint(0, 0) == value_ ? pixel_coord_to_point(pos) : value_;
+
+    double x = value.x(), y = value.y();
+
+    if (_preview_only)
+        y = _config->get_value_no_save(x);
+
+    const int x_ = iround(x), y_ = iround(y);
+
+    using std::fabs;
+
+    if (fabs(x_ - x) < 1e-3)
+        x = x_;
+    if (fabs(y_ - y) < 1e-3)
+        y = y_;
+
+    const bool is_fusion = QStringLiteral("fusion") == QApplication::style()->objectName();
+    const int add_x = (is_fusion ? 25 : 0), add_y = (is_fusion ? 15 : 0);
+
+    const QPoint pix(int(pos.x()) + add_x, int(pos.y()) + add_y);
+
+    QToolTip::showText(mapToGlobal(pix),
+                       QStringLiteral("value: %1x%2").arg(x).arg(y),
+                       this,
+                       rect(),
+                       0);
+}
+
+bool spline_widget::is_in_bounds(const QPoint& pos) const
+{
+    static constexpr int grace = point_size * 3;
+    static constexpr int bottom_grace = int(point_size * 1.5);
+    return (pos.x() + grace        > pixel_bounds.left() &&
+            pos.x() - grace        < pixel_bounds.right() &&
+            pos.y() + grace        > pixel_bounds.top() &&
+            pos.y() - bottom_grace < pixel_bounds.bottom());
+}
+
+void spline_widget::update_range()
+{
+    if (!_config)
+        return;
+
+    const int w = width(), h = height();
+    const int mwl = 40, mhl = 20;
+    const int mwr = 15, mhr = 35;
+
+    pixel_bounds = QRect(mwl, mhl, (w - mwl - mwr), (h - mhl - mhr));
+    c = QPointF(pixel_bounds.width() / _config->max_input(), pixel_bounds.height() / _config->max_output());
+    _draw_function = true;
+
+    _background = QPixmap();
+    _function = QPixmap();
+
+    update();
+}
+
+bool spline_widget::point_within_pixel(const QPointF& pt, const QPoint &pixel)
+{
+    const QPointF tmp = pixel - point_to_pixel(pt);
+    return QPointF::dotProduct(tmp, tmp) < point_size * point_size;
+}
+
+void spline_widget::focusOutEvent(QFocusEvent* e)
+{
+    if (moving_control_point_idx != -1)
+        QToolTip::hideText();
+    moving_control_point_idx = -1;
+    _draw_function = true;
+    lower();
+    setCursor(Qt::ArrowCursor);
+    e->accept();
+}
+
+QPointF spline_widget::pixel_coord_to_point(const QPoint& point)
+{
+    qreal x = (point.x() - pixel_bounds.x()) / c.x();
+    qreal y = (pixel_bounds.height() - point.y() + pixel_bounds.y()) / c.y();
+
+    static constexpr int c = 1000;
+
+    if (snap_x > 0)
+    {
+        x += snap_x * .5;
+        x -= std::fmod(x, snap_x);
+        // truncate after few decimal places to reduce rounding errors.
+        // round upward to nearest.
+        x = int(x * c + .5/c) / double(c);
+    }
+    if (snap_y > 0)
+    {
+        y += snap_y * .5;
+        y -= std::fmod(y, snap_y);
+        // idem
+        y = int(y * c + .5/c) / double(c);
+    }
+
+    if (x < 0)
+        x = 0;
+    if (x > _config->max_input())
+        x = _config->max_input();
+
+    if (y < 0)
+        y = 0;
+    if (y > _config->max_output())
+        y = _config->max_output();
+
+    return QPointF(x, y);
+}
+
+QPointF spline_widget::point_to_pixel_(const QPointF& point)
+{
+    return QPointF(pixel_bounds.x() + point.x() * c.x(),
+                   pixel_bounds.y() + pixel_bounds.height() - point.y() * c.y());
+}
+
+QPoint spline_widget::point_to_pixel(const QPointF& point)
+{
+    QPointF pt(point_to_pixel_(point));
+
+    return QPoint(iround(pt.x()), iround(pt.y()));
+}
+
+void spline_widget::resizeEvent(QResizeEvent *)
+{
+    update_range();
+}
+
+bool spline_widget::is_on_pt(const QPoint& pos, int* pt)
+{
+    if (!_config)
+    {
+        if (pt)
+            *pt = -1;
+        return false;
+    }
+
+    const points_t points = _config->get_points();
+
+    for (int i = 0; i < points.size(); i++)
+    {
+        if (point_within_pixel(points[i], pos))
+        {
+            if (pt)
+                *pt = i;
+            return true;
+        }
+    }
+
+    if (pt)
+        *pt = -1;
+    return false;
+}
diff --git a/spline/spline-widget.hpp b/spline/spline-widget.hpp
new file mode 100644
index 00000000..4d5a7680
--- /dev/null
+++ b/spline/spline-widget.hpp
@@ -0,0 +1,106 @@
+/* Copyright (c) 2012-2016 Stanislaw Halik <sthalik@misaki.pl>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+
+// Adapted to FaceTrackNoIR by Wim Vriend.
+
+#pragma once
+
+#include "spline.hpp"
+#include "api/plugin-api.hpp"
+#include "options/options.hpp"
+using namespace options;
+
+#include "export.hpp"
+
+#include <QWidget>
+#include <QRect>
+#include <QPoint>
+#include <QPointF>
+#include <QToolTip>
+#include <QShowEvent>
+#include <QFocusEvent>
+#include <QMetaObject>
+
+#include <QDebug>
+
+class OPENTRACK_SPLINE_EXPORT spline_widget final : public QWidget
+{
+    Q_OBJECT
+    Q_PROPERTY(QColor colorBezier READ colorBezier WRITE setColorBezier)
+    Q_PROPERTY(bool is_preview_only READ is_preview_only WRITE set_preview_only)
+    Q_PROPERTY(int x_step READ x_step WRITE set_x_step)
+    Q_PROPERTY(int y_step READ y_step WRITE set_y_step)
+
+    using points_t = spline::points_t;
+public:
+    spline_widget(QWidget *parent = 0);
+    ~spline_widget();
+
+    spline* config();
+    void setConfig(spline* spl);
+
+    QColor colorBezier() const;
+    void setColorBezier(QColor color);
+
+    void force_redraw();
+    void set_preview_only(bool val);
+    bool is_preview_only() const;
+
+    double x_step() { return _x_step; }
+    double y_step() { return _y_step; }
+    void set_x_step(double val) { _x_step = val; }
+    void set_y_step(double val) { _y_step = val; }
+
+    void set_snap(double x, double y) { snap_x = x; snap_y = y; }
+    void get_snap(double& x, double& y) const { x = snap_x; y = snap_y; }
+public slots:
+    void reload_spline();
+protected slots:
+    void paintEvent(QPaintEvent *e) override;
+    void mousePressEvent(QMouseEvent *e) override;
+    void mouseMoveEvent(QMouseEvent *e) override;
+    void mouseReleaseEvent(QMouseEvent *e) override;
+private:
+    int get_closeness_limit();
+    void show_tooltip(const QPoint& pos, const QPointF& value = QPointF(0, 0));
+    bool is_in_bounds(const QPoint& pos) const;
+
+    void drawBackground();
+    void drawFunction();
+    void drawPoint(QPainter& painter, const QPointF& pt, const QColor& colBG, const QColor& border = QColor(50, 100, 120, 200));
+    void drawLine(QPainter& painter, const QPoint& start, const QPoint& end, const QPen& pen);
+    bool point_within_pixel(const QPointF& pt, const QPoint& pixel);
+
+    void focusOutEvent(QFocusEvent*e) override;
+    void resizeEvent(QResizeEvent *) override;
+
+    bool is_on_pt(const QPoint& pos, int* pt = nullptr);
+    void update_range();
+    QPointF pixel_coord_to_point(const QPoint& point);
+
+    QPointF point_to_pixel_(const QPointF& point);
+    QPoint point_to_pixel(const QPointF& point);
+
+    QPointF c;
+    spline* _config;
+
+    QPixmap _background;
+    QPixmap _function;
+    QColor spline_color;
+
+    // bounds of the rectangle user can interact with
+    QRect pixel_bounds;
+
+    QMetaObject::Connection connection;
+
+    double snap_x, snap_y;
+    double _x_step, _y_step;
+    int moving_control_point_idx;
+    bool _draw_function, _preview_only;
+
+    static constexpr int point_size = 4;
+};
diff --git a/spline/spline.cpp b/spline/spline.cpp
new file mode 100644
index 00000000..2db23c14
--- /dev/null
+++ b/spline/spline.cpp
@@ -0,0 +1,469 @@
+/* Copyright (c) 2012-2016, Stanislaw Halik <sthalik@misaki.pl>
+
+ * Permission to use, copy, modify, and/or distribute this
+ * software for any purpose with or without fee is hereby granted,
+ * provided that the above copyright notice and this permission
+ * notice appear in all copies.
+ */
+
+#include "spline.hpp"
+
+#include <algorithm>
+#include <cmath>
+#include <memory>
+
+#include <QObject>
+#include <QMutexLocker>
+#include <QCoreApplication>
+#include <QPointF>
+#include <QSettings>
+#include <QString>
+
+#include <QDebug>
+
+constexpr int spline::value_count;
+
+spline::spline(qreal maxx, qreal maxy, const QString& name) :
+    s(nullptr),
+    data(value_count, -1.f),
+    _mutex(QMutex::Recursive),
+    max_x(maxx),
+    max_y(maxy),
+    activep(false),
+    validp(false)
+{
+    set_bundle(options::make_bundle(name));
+}
+
+spline::~spline()
+{
+    QMutexLocker l(&_mutex);
+
+    if (connection)
+    {
+        QObject::disconnect(connection);
+        connection = QMetaObject::Connection();
+    }
+}
+
+spline::spline() : spline(0, 0, "") {}
+
+void spline::set_tracking_active(bool value)
+{
+    activep = value;
+}
+
+bundle spline::get_bundle()
+{
+    return s->b;
+}
+
+void spline::clear()
+{
+    QMutexLocker l(&_mutex);
+    s->points = points_t();
+    validp = false;
+}
+
+void spline::set_max_input(qreal max_input)
+{
+    QMutexLocker l(&_mutex);
+    max_x = max_input;
+    recompute();
+}
+
+void spline::set_max_output(qreal max_output)
+{
+    QMutexLocker l(&_mutex);
+    max_y = max_output;
+    recompute();
+}
+
+qreal spline::max_input() const
+{
+    QMutexLocker l(&_mutex);
+    return max_x;
+}
+
+qreal spline::max_output() const
+{
+    QMutexLocker l(&_mutex);
+    return max_y;
+}
+
+float spline::get_value(double x)
+{
+    QMutexLocker foo(&_mutex);
+
+    const float ret = get_value_no_save(x);
+    last_input_value.setX(std::fabs(x));
+    last_input_value.setY(double(std::fabs(ret)));
+    return ret;
+}
+
+float spline::get_value_no_save(double x) const
+{
+    return const_cast<spline&>(*this).get_value_no_save_internal(x);
+}
+
+float spline::get_value_no_save_internal(double x)
+{
+    QMutexLocker foo(&_mutex);
+
+    if (max_x > 0)
+        x = std::min(max_x, x);
+
+    float  q  = float(x * precision(s->points));
+    int    xi = (int)q;
+    float  yi = get_value_internal(xi);
+    float  yiplus1 = get_value_internal(xi+1);
+    float  f = (q-xi);
+    float  ret = yiplus1 * f + yi * (1.0f - f); // at least do a linear interpolation.
+    return ret;
+}
+
+DEFUN_WARN_UNUSED bool spline::get_last_value(QPointF& point)
+{
+    QMutexLocker foo(&_mutex);
+    point = last_input_value;
+    return activep;
+}
+
+float spline::get_value_internal(int x)
+{
+    if (!validp)
+    {
+        update_interp_data();
+        validp = true;
+    }
+
+    float sign = x < 0 ? -1 : 1;
+    x = std::abs(x);
+    float ret;
+        ret = data[std::min(unsigned(x), unsigned(value_count)-1u)];
+    return ret * sign;
+}
+
+void spline::add_lone_point()
+{
+    points_t points;
+    points.push_back(QPointF(max_x, max_y));
+
+    s->points = points;
+}
+
+QPointF spline::ensure_in_bounds(const QList<QPointF>& points, double max_x, int i)
+{
+    const int sz = element_count(points, max_x);
+
+    if (i < 0 || sz == 0)
+        return QPointF(0, 0);
+
+    if (i < sz)
+        return points[i];
+
+    return points[sz - 1];
+}
+
+int spline::element_count(const QList<QPointF>& points, double max_x)
+{
+    if (!(max_x > 0))
+        return points.size();
+    else
+    {
+        const unsigned sz = points.size();
+        for (unsigned i = 0; i < sz; i++)
+        {
+            if (!(points[i].x() <= max_x))
+                return i;
+        }
+        return points.size();
+    }
+}
+
+bool spline::sort_fn(const QPointF& one, const QPointF& two)
+{
+    return one.x() <= two.x();
+}
+
+void spline::update_interp_data()
+{
+    points_t points = s->points;
+
+    int sz = element_count(points, max_x);
+
+    if (sz == 0)
+        points.prepend(QPointF(max_x, max_y));
+
+    std::stable_sort(points.begin(), points.begin() + sz, sort_fn);
+
+    const double mult = precision(points);
+    const double mult_ = mult * 30;
+
+    for (unsigned i = 0; i < value_count; i++)
+        data[i] = -1;
+
+    if (sz < 2)
+    {
+        if (points[0].x() - 1e-2 <= max_x)
+        {
+            const double x = points[0].x();
+            const double y = points[0].y();
+            const int max = clamp(int(x * precision(points)), 1, value_count-1);
+            for (int k = 0; k <= max; k++)
+            {
+                if (k < value_count)
+                    data[unsigned(k)] = float(y * k / max);
+            }
+        }
+    }
+    else
+    {
+        if (points[0].x() > 1e-2 && points[0].x() <= max_x)
+            points.push_front(QPointF(0, 0));
+
+        for (int i = 0; i < sz; i++)
+        {
+            const QPointF p0 = ensure_in_bounds(points, max_x, i - 1);
+            const QPointF p1 = ensure_in_bounds(points, max_x, i + 0);
+            const QPointF p2 = ensure_in_bounds(points, max_x, i + 1);
+            const QPointF p3 = ensure_in_bounds(points, max_x, i + 2);
+            const double p0_x = p0.x(), p1_x = p1.x(), p2_x = p2.x(), p3_x = p3.x();
+            const double p0_y = p0.y(), p1_y = p1.y(), p2_y = p2.y(), p3_y = p3.y();
+
+            const double cx[4] = {
+                2 * p1_x, // 1
+                -p0_x + p2_x, // t
+                2 * p0_x - 5 * p1_x + 4 * p2_x - p3_x, // t^2
+                -p0_x + 3 * p1_x - 3 * p2_x + p3_x, // t3
+            };
+
+            const double cy[4] =
+            {
+                2 * p1_y, // 1
+                -p0_y + p2_y, // t
+                2 * p0_y - 5 * p1_y + 4 * p2_y - p3_y, // t^2
+                -p0_y + 3 * p1_y - 3 * p2_y + p3_y, // t3
+            };
+
+            // multiplier helps fill in all the x's needed
+            const unsigned end = std::min(unsigned(value_count), unsigned(p2_x * mult_));
+            const unsigned start = std::max(0u, unsigned(p1_x * mult));
+
+            for (unsigned j = start; j < end; j++)
+            {
+                const double t = (j - start) / (double) (end - start);
+                const double t2 = t*t;
+                const double t3 = t*t*t;
+
+                const int x = iround(.5 * mult * (cx[0] + cx[1] * t + cx[2] * t2 + cx[3] * t3));
+                const float y = float(.5 * (cy[0] + cy[1] * t + cy[2] * t2 + cy[3] * t3));
+
+                if (x >= 0 && x < value_count)
+                    data[unsigned(x)] = y;
+            }
+        }
+    }
+
+    float last = 0;
+    for (unsigned i = 0; i < unsigned(value_count); i++)
+    {
+        if (data[i] < 0)
+            data[i] = last;
+        last = data[i];
+    }
+}
+
+void spline::remove_point(int i)
+{
+    QMutexLocker foo(&_mutex);
+
+    points_t points = s->points;
+    const int sz = element_count(points, max_x);
+
+    if (i >= 0 && i < sz)
+    {
+        points.erase(points.begin() + i);
+        s->points = points;
+        validp = false;
+    }
+}
+
+void spline::add_point(QPointF pt)
+{
+    QMutexLocker foo(&_mutex);
+
+    points_t points = s->points;
+    points.push_back(pt);
+    std::stable_sort(points.begin(), points.end(), sort_fn);
+    s->points = points;
+    validp = false;
+}
+
+void spline::add_point(double x, double y)
+{
+    add_point(QPointF(x, y));
+}
+
+void spline::move_point(int idx, QPointF pt)
+{
+    QMutexLocker foo(&_mutex);
+
+    points_t points = s->points;
+
+    const int sz = element_count(points, max_x);
+
+    if (idx >= 0 && idx < sz)
+    {
+        points[idx] = pt;
+        // we don't allow points to be reordered, but sort due to possible caller logic error
+        std::stable_sort(points.begin(), points.end(), sort_fn);
+        s->points = points;
+        validp = false;
+    }
+}
+
+QList<QPointF> spline::get_points() const
+{
+    QMutexLocker foo(&_mutex);
+    return s->points;
+}
+
+int spline::get_point_count() const
+{
+    QMutexLocker foo(&_mutex);
+    return element_count(s->points, max_x);;
+}
+
+void spline::reload()
+{
+    QMutexLocker foo(&_mutex);
+    s->b->reload();
+}
+
+void spline::save(QSettings& settings)
+{
+    QMutexLocker foo(&_mutex);
+    s->b->save_deferred(settings);
+}
+
+void spline::save()
+{
+    save(*group::ini_file());
+}
+
+void spline::set_bundle(bundle b)
+{
+    QMutexLocker l(&_mutex);
+
+    // gets called from ctor hence the need for nullptr checks
+    // the sentinel settings/bundle objects don't need any further branching once created
+    if (!s || s->b != b)
+    {
+        s = std::make_shared<settings>(b);
+
+        if (connection)
+            QObject::disconnect(connection);
+
+        if (b)
+        {
+            connection = QObject::connect(b.get(), &bundle_::changed,
+                                          s.get(), [&]() {
+                                              // we're holding the mutex to allow signal disconnection in spline dtor
+                                              // before this slot gets called for the next time
+
+                                              // spline isn't a QObject and the connection context is incorrect
+
+                                              QMutexLocker l(&_mutex);
+                                              recompute();
+                                              emit s->recomputed();
+                                          },
+                                          Qt::QueuedConnection);
+        }
+
+        recompute();
+
+        emit s->recomputed();
+    }
+}
+
+void spline::recompute()
+{
+    QMutexLocker foo(&_mutex);
+
+    QList<QPointF> list = s->points;
+
+    // storing to s->points fires bundle::changed and that leads to an infinite loop
+    // only store if we can't help it
+    std::stable_sort(list.begin(), list.end(), sort_fn);
+
+    if (list != s->points)
+        s->points = list;
+
+    const int sz = list.size();
+
+    QList<QPointF> ret_list;
+    ret_list.reserve(sz);
+
+    for (int i = 0; i < sz; i++)
+    {
+        QPointF& pt(list[i]);
+
+        const bool overlap = progn(
+                                for (int j = 0; j < i; j++)
+                                {
+                                    QPointF& pt2(list[j]);
+                                    const double dist_sq = (pt.x() - pt2.x())*(pt.x() - pt2.x());
+                                    static constexpr double overlap = .6;
+                                    if (dist_sq < overlap * overlap)
+                                        return true;
+                                }
+                                return false;
+                             );
+        if (!overlap)
+            ret_list.push_back(pt);
+    }
+
+    if (ret_list != s->points)
+        s->points = ret_list;
+
+    last_input_value = QPointF(0, 0);
+    activep = false;
+    validp = false;
+}
+
+// the return value is only safe to use with no spline::set_bundle calls
+mem<spline::settings> spline::get_settings()
+{
+    QMutexLocker foo(&_mutex);
+    return s;
+}
+
+mem<const spline::settings> spline::get_settings() const
+{
+    QMutexLocker foo(&_mutex);
+    return s;
+}
+
+double spline::precision(const QList<QPointF>& points) const
+{
+    // this adjusts the memoized range to the largest X value. empty space doesn't take value_count discrete points.
+    const int sz = element_count(points, max_x);
+    if (sz)
+        return clamp(value_count / clamp(points[sz - 1].x(), 1., max_x), 0., double(value_count));
+
+    return value_count / clamp(max_x, 1., double(value_count));
+}
+
+namespace spline_detail {
+
+settings::settings(bundle b):
+    b(b ? b : make_bundle("")),
+    points(b, "points", QList<QPointF>())
+{}
+
+settings::~settings()
+{
+}
+
+}
diff --git a/spline/spline.hpp b/spline/spline.hpp
new file mode 100644
index 00000000..77b2bdf9
--- /dev/null
+++ b/spline/spline.hpp
@@ -0,0 +1,108 @@
+/* Copyright (c) 2012-2016, Stanislaw Halik <sthalik@misaki.pl>
+
+ * Permission to use, copy, modify, and/or distribute this
+ * software for any purpose with or without fee is hereby granted,
+ * provided that the above copyright notice and this permission
+ * notice appear in all copies.
+ */
+
+#pragma once
+
+#include "compat/qcopyable-mutex.hpp"
+#include "options/options.hpp"
+#include "compat/util.hpp"
+using namespace options;
+
+#include "export.hpp"
+
+#include <vector>
+#include <limits>
+#include <memory>
+
+#include <QObject>
+#include <QPointF>
+#include <QString>
+#include <QMetaObject>
+
+namespace spline_detail {
+
+class OPENTRACK_SPLINE_EXPORT settings final : public QObject
+{
+    Q_OBJECT
+public:
+    bundle b;
+    value<QList<QPointF>> points;
+    settings(bundle b);
+    ~settings() override;
+signals:
+    void recomputed() const;
+};
+
+}
+
+class OPENTRACK_SPLINE_EXPORT spline final
+{
+    double precision(const QList<QPointF>& points) const;
+    void update_interp_data();
+    float get_value_internal(int x);
+    void add_lone_point();
+    float get_value_no_save_internal(double x);
+    static bool sort_fn(const QPointF& one, const QPointF& two);
+
+    static QPointF ensure_in_bounds(const QList<QPointF>& points, double max_x, int i);
+    static int element_count(const QList<QPointF>& points, double max_x);
+
+    mem<spline_detail::settings> s;
+    QMetaObject::Connection connection;
+
+    std::vector<float> data;
+    using interp_data_t = decltype(data);
+
+    static constexpr int value_count = 4096;
+
+    MyMutex _mutex;
+    QPointF last_input_value;
+    qreal max_x, max_y;
+    volatile bool activep;
+    bool validp;
+
+public:
+    using settings = spline_detail::settings;
+
+    void reload();
+    void save(QSettings& s);
+    void save();
+    void set_bundle(bundle b);
+
+    qreal max_input() const;
+    qreal max_output() const;
+    spline();
+    spline(qreal maxx, qreal maxy, const QString& name);
+    ~spline();
+
+    spline& operator=(const spline&) = default;
+    spline(const spline&) = default;
+
+    float get_value(double x);
+    float get_value_no_save(double x) const;
+    DEFUN_WARN_UNUSED bool get_last_value(QPointF& point);
+    void remove_point(int i);
+    void clear();
+
+    void add_point(QPointF pt);
+    void add_point(double x, double y);
+    void move_point(int idx, QPointF pt);
+    QList<QPointF> get_points() const;
+    void set_max_input(qreal MaxInput);
+    void set_max_output(qreal MaxOutput);
+
+    void set_tracking_active(bool value);
+    bundle get_bundle();
+    void recompute();
+
+    mem<settings> get_settings();
+    mem<const settings> get_settings() const;
+
+    using points_t = decltype(s->points());
+    int get_point_count() const;
+};