Version 1.0

Added: Configuration Editor, which allows to edit configurations in a graphical user interface. Contains GUIs for most commands supported by E-APO, but as lines can also be edited directly, all commands can be used.
Added: Command "GraphicEQ", which can act as a regular, fixed-band graphic equalizer (via the GUI) but also supports variable bands so that any desired frequency response can be specified. Internally, it is implemented via convolution with a generated IR.
Added: Command "Convolution", which allows to convolve the signal with a user-provided impulse response to achieve e.g. equalization or reverberation effects.
Improved: Configurator performs checks for registry values that are needed for the operation of E-APO, which may be changed by driver installations, fixing the values if necessary.
Improved: Configurator shows which is the default device as a hint to the user.

Editor/widgets/ChannelGraphItem.cpp

@@ -0,0 +1,67 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <QGraphicsScene>
+#include <QPainter>
+
+#include "ChannelGraphItem.h"
+
+static const float margin = 5;
+
+ChannelGraphItem::ChannelGraphItem(const QString& name)
+	: name(name)
+{
+}
+
+QRectF ChannelGraphItem::boundingRect() const
+{
+	if(cachedRect.isNull())
+	{
+		QFontMetrics metrics(scene()->font());
+		int width = metrics.width(name);
+		// we only use upper case characters and digits, so everything is above the baseline
+		int height = metrics.ascent();
+		// make it at least quadratic
+		if(width < height)
+			width = height;
+		// shift by 0.5 to have sharp lines
+		cachedRect.setLeft(0.5);
+		cachedRect.setTop(0.5);
+		cachedRect.setWidth(width + 2 * margin);
+		cachedRect.setHeight(height + 2 * margin);
+	}
+
+	return cachedRect;
+}
+
+QString ChannelGraphItem::getName() const
+{
+	return name;
+}
+
+void ChannelGraphItem::paint(QPainter* painter, QColor color)
+{
+	QRectF rect = boundingRect();
+	QLinearGradient gradient(rect.topLeft(), rect.bottomLeft());
+	gradient.setColorAt(0, QColor(255, 255, 255));
+	gradient.setColorAt(1, color);
+	painter->setBrush(gradient);
+	painter->drawRoundedRect(rect, margin, margin);
+	painter->drawText(rect.translated(1, -1), Qt::AlignCenter, name);
+}

Editor/widgets/ChannelGraphItem.h

@@ -0,0 +1,39 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QGraphicsItem>
+
+class ChannelGraphItem : public QGraphicsItem
+{
+public:
+	explicit ChannelGraphItem(const QString& name = 0);
+
+	QRectF boundingRect() const override;
+
+	QString getName() const;
+
+protected:
+	virtual void paint(QPainter* painter, QColor color);
+
+private:
+	QString name;
+	mutable QRectF cachedRect;
+};

Editor/widgets/ChannelGraphScene.cpp

@@ -0,0 +1,39 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <QGraphicsItem>
+
+#include "ChannelGraphScene.h"
+
+ChannelGraphScene::ChannelGraphScene(QWidget *parent) :
+	QGraphicsScene(parent)
+{
+}
+
+QPointF ChannelGraphScene::getNextChannelPoint(QGraphicsItem* lastItem, bool output)
+{
+	int x = 0;
+	if(lastItem != NULL)
+	{
+		QRectF lastRect = lastItem->sceneBoundingRect();
+		x = lastRect.left() + lastRect.width() + 1 + 10;
+	}
+
+	return QPointF(x, output ? 50 : 0);
+}

Editor/widgets/ChannelGraphScene.h

@@ -0,0 +1,33 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QGraphicsScene>
+
+class ChannelGraphScene : public QGraphicsScene
+{
+	Q_OBJECT
+public:
+	explicit ChannelGraphScene(QWidget *parent = 0);
+
+protected:
+	QPointF getNextChannelPoint(QGraphicsItem* lastItem, bool output);
+
+};

Editor/widgets/CompactToolBar.cpp

@@ -0,0 +1,38 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "CompactToolBar.h"
+
+CompactToolBar::CompactToolBar(QWidget *parent) :
+	QToolBar(parent)
+{
+	setMinimumHeight(1);
+	setOrientation(Qt::Vertical);
+	setIconSize(QSize(16, 16));
+}
+
+QSize CompactToolBar::sizeHint() const
+{
+	return QSize(1, 1);
+}
+
+void CompactToolBar::updateMaximumHeight()
+{
+	setMaximumHeight(QToolBar::sizeHint().height());
+}

Editor/widgets/CompactToolBar.h

@@ -0,0 +1,32 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QToolBar>
+
+class CompactToolBar : public QToolBar
+{
+	Q_OBJECT
+public:
+	explicit CompactToolBar(QWidget *parent = 0);
+
+	QSize sizeHint() const override;
+	void updateMaximumHeight();
+};

Editor/widgets/EscapableLineEdit.cpp

@@ -0,0 +1,36 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <QKeyEvent>
+
+#include "EscapableLineEdit.h"
+
+EscapableLineEdit::EscapableLineEdit(QWidget *parent) :
+	QLineEdit(parent)
+{
+}
+
+void EscapableLineEdit::keyPressEvent(QKeyEvent* event)
+{
+
+	if(event->key() == Qt::Key_Escape)
+		emit editingCanceled();
+	else
+		QLineEdit::keyPressEvent(event);
+}

Editor/widgets/EscapableLineEdit.h

@@ -0,0 +1,35 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QLineEdit>
+
+class EscapableLineEdit : public QLineEdit
+{
+	Q_OBJECT
+public:
+	explicit EscapableLineEdit(QWidget *parent = 0);
+
+signals:
+	void editingCanceled();
+
+protected:
+	void keyPressEvent(QKeyEvent* event) override;
+};

Editor/widgets/FrequencyPlotHRuler.cpp

@@ -0,0 +1,90 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <algorithm>
+#include <QPainter>
+
+#include "FrequencyPlotView.h"
+#include "FrequencyPlotHRuler.h"
+
+using namespace std;
+
+FrequencyPlotHRuler::FrequencyPlotHRuler(QWidget* parent) :
+	QWidget(parent)
+{
+}
+
+void FrequencyPlotHRuler::paintEvent(QPaintEvent*)
+{
+	QPainter painter(this);
+	FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(parentWidget());
+	FrequencyPlotScene* s = view->scene();
+	QFontMetrics metrics = painter.fontMetrics();
+	painter.setPen(QColor(50, 50, 50));
+
+	QPointF topLeft = view->mapToScene(0, 0);
+	QPointF bottomRight = view->mapToScene(view->viewport()->width(), view->viewport()->height());
+	double fromHz = s->xToHz(topLeft.x());
+	double toHz = s->xToHz(bottomRight.x());
+	const vector<double>& bands = s->getBands();
+	if(bands.empty())
+	{
+		double hzBase = pow(10, floor(log10(fromHz)));
+		fromHz = floor(fromHz / hzBase) * hzBase;
+		fromHz += hzBase;
+		if(round(fromHz / hzBase) >= 10)
+			hzBase *= 10;
+		for(double hz = fromHz; hz <= toHz;)
+		{
+			double x = s->hzToX(hz);
+			if(x != -1)
+			{
+				QString text;
+				if(hz < 1000)
+					text = QString("%0").arg(hz);
+				else
+					text = QString("%0k").arg(hz / 1000);
+				if(metrics.width(text) + 2 < s->hzToX(hz + hzBase) - x)
+					painter.drawText(x - topLeft.x() + height() + 1, 0, 0, height(), Qt::TextDontClip | Qt::AlignCenter, text);
+			}
+
+			hz += hzBase;
+			if(round(hz / hzBase) >= 10)
+				hzBase *= 10;
+		}
+	}
+	else
+	{
+		vector<double>::const_iterator it = lower_bound(bands.cbegin(), bands.cend(), fromHz);
+		for(; it != bands.cend() && *it < toHz; it++)
+		{
+			double hz = *it;
+			double x = s->hzToX(hz);
+			if(x != -1)
+			{
+				QString text;
+				if(hz < 1000)
+					text = QString("%0").arg(hz);
+				else
+					text = QString("%0k").arg(hz / 1000);
+				painter.drawText(x - topLeft.x() + height() + 1, 0, 0, height(), Qt::TextDontClip | Qt::AlignCenter, text);
+			}
+		}
+	}
+}

Editor/widgets/FrequencyPlotHRuler.h

@@ -0,0 +1,32 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QWidget>
+
+class FrequencyPlotHRuler : public QWidget
+{
+	Q_OBJECT
+public:
+	explicit FrequencyPlotHRuler(QWidget* parent = 0);
+
+protected:
+	void paintEvent(QPaintEvent*) override;
+};

Editor/widgets/FrequencyPlotItem.cpp

@@ -0,0 +1,57 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <QGraphicsScene>
+
+#include "FrequencyPlotScene.h"
+#include "FrequencyPlotItem.h"
+
+FrequencyPlotItem::FrequencyPlotItem(double hz, double db)
+	: hz(hz), db(db)
+{
+	setFlag(ItemSendsScenePositionChanges);
+}
+
+void FrequencyPlotItem::updatePos()
+{
+	setFlag(ItemSendsScenePositionChanges, false);
+	FrequencyPlotScene* s = qobject_cast<FrequencyPlotScene*>(scene());
+	setPos(floor(s->hzToX(hz)) + 0.5, floor(s->dbToY(db)) + 0.5);
+	setFlag(ItemSendsScenePositionChanges, true);
+}
+
+double FrequencyPlotItem::getHz() const
+{
+	return hz;
+}
+
+void FrequencyPlotItem::setHz(double value)
+{
+	hz = value;
+}
+
+double FrequencyPlotItem::getDb() const
+{
+	return db;
+}
+
+void FrequencyPlotItem::setDb(double value)
+{
+	db = value;
+}

Editor/widgets/FrequencyPlotItem.h

@@ -0,0 +1,46 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QGraphicsItem>
+
+class FrequencyPlotItem : public QGraphicsItem
+{
+public:
+	FrequencyPlotItem(double hz, double db);
+
+	enum { Type = UserType + 1 };
+	virtual int type() const
+	{
+		return Type;
+	}
+
+	void updatePos();
+
+	double getHz() const;
+	void setHz(double value);
+
+	double getDb() const;
+	void setDb(double value);
+
+private:
+	double hz;
+	double db;
+};

Editor/widgets/FrequencyPlotScene.cpp

@@ -0,0 +1,129 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "FrequencyPlotView.h"
+#include "FrequencyPlotScene.h"
+
+using namespace std;
+
+static double maxX = 1000;
+static double maxY = 500;
+static double minHz = 1;
+static double maxHz = 30000;
+static double minDb = -100;
+static double maxDb = 100;
+
+vector<double> FrequencyPlotScene::bands15 = {25, 40, 63, 100, 160, 250, 400, 630, 1000, 1600, 2500, 4000, 6300, 10000, 16000};
+vector<double> FrequencyPlotScene::bands31 = {20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800,
+											  1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12500, 16000, 20000
+											 };
+vector<double> FrequencyPlotScene::bandsVar;
+
+FrequencyPlotScene::FrequencyPlotScene(QObject *parent) :
+	QGraphicsScene(parent)
+{
+	updateSceneRect();
+}
+
+void FrequencyPlotScene::addItem(FrequencyPlotItem* item)
+{
+	QGraphicsScene::addItem(item);
+}
+
+double FrequencyPlotScene::xToHz(double x)
+{
+	return pow(maxHz / minHz, x / zoom / maxX) * minHz;
+}
+
+double FrequencyPlotScene::hzToX(double hz)
+{
+	if(hz < minHz || hz > maxHz)
+		return -1;
+
+	return log(hz / minHz) / log(maxHz / minHz) * maxX * zoom;
+}
+
+double FrequencyPlotScene::yToDb(double y)
+{
+	return (minDb + (1 - y / zoom / maxY) * (maxDb - minDb));
+}
+
+double FrequencyPlotScene::dbToY(double db)
+{
+	if(db < minDb || db > maxDb)
+		return -1;
+
+	return (1 - (db - minDb) / (maxDb - minDb)) * maxY * zoom;
+}
+
+double FrequencyPlotScene::getZoom() const
+{
+	return zoom;
+}
+
+void FrequencyPlotScene::setZoom(double value)
+{
+	zoom = value;
+	updateSceneRect();
+
+	for(QGraphicsItem* item : items())
+	{
+		FrequencyPlotItem* plotItem = (FrequencyPlotItem*)item;
+		plotItem->updatePos();
+	}
+}
+
+void FrequencyPlotScene::updateSceneRect()
+{
+	setSceneRect(0, 0, maxX * zoom, maxY * zoom);
+}
+
+int FrequencyPlotScene::getBandCount() const
+{
+	return bandCount;
+}
+
+void FrequencyPlotScene::setBandCount(int value)
+{
+	if(value != bandCount)
+	{
+		bandCount = value;
+		update();
+		FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(views()[0]);
+		view->updateHRuler();
+	}
+}
+
+const vector<double>& FrequencyPlotScene::getBands()
+{
+	return getBands(bandCount);
+}
+
+const std::vector<double>&FrequencyPlotScene::getBands(int count)
+{
+	switch(count)
+	{
+	case 15:
+		return bands15;
+	case 31:
+		return bands31;
+	default:
+		return bandsVar;
+	}
+}

Editor/widgets/FrequencyPlotScene.h

@@ -0,0 +1,59 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <vector>
+#include <QGraphicsScene>
+
+#include "FrequencyPlotItem.h"
+
+class FrequencyPlotScene : public QGraphicsScene
+{
+	Q_OBJECT
+public:
+	explicit FrequencyPlotScene(QObject *parent = 0);
+
+	void addItem(FrequencyPlotItem *item);
+
+	double xToHz(double x);
+	double hzToX(double hz);
+	double yToDb(double y);
+	double dbToY(double db);
+
+	double getZoom() const;
+	void setZoom(double value);
+
+	int getBandCount() const;
+	virtual void setBandCount(int value);
+
+	const std::vector<double>& getBands();
+	const std::vector<double>& getBands(int count);
+
+protected:
+	static std::vector<double> bands15;
+	static std::vector<double> bands31;
+	static std::vector<double> bandsVar;
+
+private:
+	void updateSceneRect();
+
+	double zoom = 1.0;
+	int bandCount = -1;
+};

Editor/widgets/FrequencyPlotVRuler.cpp

@@ -0,0 +1,60 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "FrequencyPlotView.h"
+#include "FrequencyPlotScene.h"
+#include "FrequencyPlotVRuler.h"
+
+FrequencyPlotVRuler::FrequencyPlotVRuler(QWidget *parent) :
+	QWidget(parent)
+{
+}
+
+void FrequencyPlotVRuler::paintEvent(QPaintEvent*)
+{
+	QPainter painter(this);
+	FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(parentWidget());
+	FrequencyPlotScene* scene = view->scene();
+
+	QPointF topLeft = view->mapToScene(0, 0);
+	QPointF bottomRight = view->mapToScene(view->viewport()->width(), view->viewport()->height());
+	double dbHeight = abs(scene->yToDb(topLeft.y()) - scene->yToDb(bottomRight.y()));
+	double dbStep = dbHeight / 4;
+
+	double dbBase = pow(10, floor(log10(dbStep)));
+	if(dbStep >= 5 * dbBase)
+		dbStep = 5 * dbBase;
+	else if(dbStep >= 2 * dbBase)
+		dbStep = 2 * dbBase;
+	else
+		dbStep = dbBase;
+
+	double fromDb = floor(scene->yToDb(topLeft.y()) / dbStep) * dbStep;
+	double toDb = ceil(scene->yToDb(bottomRight.y()) / dbStep) * dbStep;
+
+	painter.setPen(QColor(50, 50, 50));
+	for(double db = toDb; db <= fromDb; db += dbStep)
+	{
+		if(abs(db) < 1e-6)
+			db = 0;
+		double y = scene->dbToY(db);
+		if(y != -1)
+			painter.drawText(0, y - topLeft.y() - 1, width(), 0, Qt::TextDontClip | Qt::AlignCenter, QString("%0").arg(db));
+	}
+}

Editor/widgets/FrequencyPlotVRuler.h

@@ -0,0 +1,32 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QWidget>
+
+class FrequencyPlotVRuler : public QWidget
+{
+	Q_OBJECT
+public:
+	explicit FrequencyPlotVRuler(QWidget *parent = 0);
+
+protected:
+	void paintEvent(QPaintEvent*) override;
+};

Editor/widgets/FrequencyPlotView.cpp

@@ -0,0 +1,191 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <algorithm>
+#include <QWheelEvent>
+#include <QScrollBar>
+
+#include "FrequencyPlotItem.h"
+#include "FrequencyPlotView.h"
+
+using namespace std;
+
+FrequencyPlotView::FrequencyPlotView(QWidget *parent) :
+	QGraphicsView(parent)
+{
+	setViewportMargins(20, 0, 0, 20);
+	hRuler = new FrequencyPlotHRuler(this);
+	vRuler = new FrequencyPlotVRuler(this);
+}
+
+FrequencyPlotScene* FrequencyPlotView::scene() const
+{
+	return qobject_cast<FrequencyPlotScene*>(QGraphicsView::scene());
+}
+
+void FrequencyPlotView::setScene(FrequencyPlotScene* scene)
+{
+	QGraphicsView::setScene(scene);
+}
+
+void FrequencyPlotView::drawBackground(QPainter* painter, const QRectF& drawRect)
+{
+	painter->setRenderHint(QPainter::Antialiasing, false);
+
+	QRectF rect = drawRect;
+	if(!sceneRect().contains(rect))
+	{
+		rect = rect.intersected(sceneRect());
+		painter->setClipRect(rect);
+	}
+
+	FrequencyPlotScene* s = scene();
+	QPointF topLeft = mapToScene(0, 0);
+	QPointF bottomRight = mapToScene(viewport()->width(), viewport()->height());
+	double dbHeight = abs(s->yToDb(topLeft.y()) - s->yToDb(bottomRight.y()));
+	double dbStep = dbHeight / 4;
+
+	double dbBase = pow(10, floor(log10(dbStep)));
+	if(dbStep >= 5 * dbBase)
+		dbStep = 5 * dbBase;
+	else if(dbStep >= 2 * dbBase)
+		dbStep = 2 * dbBase;
+	else
+		dbStep = dbBase;
+
+	double fromDb = floor(s->yToDb(rect.top() + rect.height()) / dbStep) * dbStep;
+	double toDb = ceil(s->yToDb(rect.top()) / dbStep) * dbStep;
+
+	painter->setPen(QColor(200, 200, 200));
+	for(double db = fromDb; db <= toDb; db += dbStep)
+	{
+		double y = floor(s->dbToY(db)) + 0.5;
+		if(y != -1)
+			painter->drawLine(topLeft.x(), y, bottomRight.x(), y);
+	}
+
+	double fromHz = s->xToHz(rect.left());
+	double toHz = s->xToHz(rect.left() + rect.width());
+
+	const vector<double>& bands = s->getBands();
+	if(bands.empty())
+	{
+		double hzBase = pow(10, floor(log10(fromHz)));
+		fromHz = floor(fromHz / hzBase) * hzBase;
+		fromHz += hzBase;
+		if(round(fromHz / hzBase) >= 10)
+			hzBase *= 10;
+		for(double hz = fromHz; hz <= toHz;)
+		{
+			double x = floor(s->hzToX(hz)) + 0.5;
+			if(x >= 0)
+				painter->drawLine(x, topLeft.y(), x, bottomRight.y());
+
+			hz += hzBase;
+			if(round(hz / hzBase) >= 10)
+				hzBase *= 10;
+		}
+	}
+	else
+	{
+		vector<double>::const_iterator it = lower_bound(bands.cbegin(), bands.cend(), fromHz);
+		for(; it != bands.cend() && *it < toHz; it++)
+		{
+			double hz = *it;
+			double x = floor(s->hzToX(hz)) + 0.5;
+			if(x >= 0)
+				painter->drawLine(x, topLeft.y(), x, bottomRight.y());
+		}
+	}
+}
+
+void FrequencyPlotView::updateHRuler()
+{
+	hRuler->update();
+}
+
+void FrequencyPlotView::wheelEvent(QWheelEvent* event)
+{
+	FrequencyPlotScene* s = scene();
+	QPointF scenePos = mapToScene(event->pos());
+	double hz = s->xToHz(scenePos.x());
+	double db = s->yToDb(scenePos.y());
+
+	qreal zoomFactor = pow(1.001, event->angleDelta().y());
+	s->setZoom(max(0.5, min(30, s->getZoom() * zoomFactor)));
+
+	double x = s->hzToX(hz);
+	if(x != -1)
+		horizontalScrollBar()->setValue(horizontalScrollBar()->value() + round(x - scenePos.x()));
+	double y = s->dbToY(db);
+	if(y != -1)
+		verticalScrollBar()->setValue(verticalScrollBar()->value() + round(y - scenePos.y()));
+
+	resetCachedContent();
+	viewport()->update();
+	hRuler->update();
+	vRuler->update();
+}
+
+void FrequencyPlotView::scrollContentsBy(int dx, int dy)
+{
+	QGraphicsView::scrollContentsBy(dx, dy);
+
+	if(dx != 0)
+		hRuler->update();
+	if(dy != 0)
+		vRuler->update();
+}
+
+void FrequencyPlotView::resizeEvent(QResizeEvent* event)
+{
+	QGraphicsView::resizeEvent(event);
+
+	const QRect rect = viewport()->geometry();
+	hRuler->setGeometry(rect.x() - 20, rect.y() + rect.height(), rect.width() + 20, 20);
+	vRuler->setGeometry(rect.x() - 20, rect.y(), 20, rect.height() + 20);
+}
+
+void FrequencyPlotView::mousePressEvent(QMouseEvent* event)
+{
+	QGraphicsView::mousePressEvent(event);
+
+	lastMousePos = event->pos();
+}
+
+void FrequencyPlotView::mouseMoveEvent(QMouseEvent* event)
+{
+	if(event->buttons() & Qt::RightButton)
+	{
+		horizontalScrollBar()->setValue(horizontalScrollBar()->value() - (event->x() - lastMousePos.x()));
+		verticalScrollBar()->setValue(verticalScrollBar()->value() - (event->y() - lastMousePos.y()));
+	}
+	else
+	{
+		QGraphicsView::mouseMoveEvent(event);
+	}
+	lastMousePos = event->pos();
+}
+
+void FrequencyPlotView::showEvent(QShowEvent* event)
+{
+	QGraphicsView::showEvent(event);
+
+	horizontalScrollBar()->setValue(scene()->hzToX(20));
+}

Editor/widgets/FrequencyPlotView.h

@@ -0,0 +1,53 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QGraphicsView>
+
+#include "FrequencyPlotScene.h"
+#include "FrequencyPlotHRuler.h"
+#include "FrequencyPlotVRuler.h"
+
+class FrequencyPlotView : public QGraphicsView
+{
+	Q_OBJECT
+public:
+	explicit FrequencyPlotView(QWidget *parent = 0);
+
+	FrequencyPlotScene* scene() const;
+	void setScene(FrequencyPlotScene* scene);
+
+	void drawBackground(QPainter* painter, const QRectF& drawRect) override;
+
+	void updateHRuler();
+
+protected:
+	void wheelEvent(QWheelEvent* event) override;
+	void scrollContentsBy(int dx, int dy) override;
+	void resizeEvent(QResizeEvent* event) override;
+	void mousePressEvent(QMouseEvent* event) override;
+	void mouseMoveEvent(QMouseEvent* event) override;
+	void showEvent(QShowEvent* event) override;
+
+private:
+	FrequencyPlotHRuler* hRuler;
+	FrequencyPlotVRuler* vRuler;
+	QPoint lastMousePos;
+};

Editor/widgets/ResizingLineEdit.cpp

@@ -0,0 +1,54 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "ResizingLineEdit.h"
+
+ResizingLineEdit::ResizingLineEdit(QWidget *parent) :
+	QLineEdit(parent)
+{
+	connect(this, SIGNAL(textChanged(QString)), this, SLOT(readjustSize()));
+
+	readjustSize();
+}
+
+ResizingLineEdit::ResizingLineEdit(const QString& text, QWidget* parent) :
+	QLineEdit(text, parent)
+{
+	connect(this, SIGNAL(textChanged(QString)), this, SLOT(readjustSize()));
+
+	readjustSize();
+}
+
+QSize ResizingLineEdit::sizeHint() const
+{
+	QSize originalSize = QLineEdit::sizeHint();
+
+	QFontMetrics metrics = fontMetrics();
+	QSize contentSize(metrics.width(text()), metrics.height());
+	QStyleOptionFrameV2 opt;
+	initStyleOption(&opt);
+
+	QSize size = style()->sizeFromContents(QStyle::CT_LineEdit, &opt, contentSize, this);
+	return QSize(size.width(), originalSize.height());
+}
+
+void ResizingLineEdit::readjustSize()
+{
+	setFixedWidth(sizeHint().width());
+}

Editor/widgets/ResizingLineEdit.h

@@ -0,0 +1,35 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <QLineEdit>
+
+class ResizingLineEdit : public QLineEdit
+{
+	Q_OBJECT
+public:
+	explicit ResizingLineEdit(QWidget *parent = 0);
+	explicit ResizingLineEdit(const QString& text, QWidget* parent=0);
+
+	QSize sizeHint() const override;
+
+private slots:
+	void readjustSize();
+};