Added: Analysis panel which shows the calculated frequency response of the filters for the selected device and channel.

Improved: GUIs of GraphicEQ and Copy command can now be resized
Improved: GraphicEQ GUI can now be zoomed separately in X and Y direction using mouse wheel on rulers. Also now shows values at mouse position.
Fixed: Original APO was not released when E-APO was shutting down, leading to a memory leak.

Editor/AnalysisThread.h

@@ -0,0 +1,84 @@
+/*
+	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 <QThread>
+#include <QWaitCondition>
+#include <fftw3.h>
+
+#include "DeviceAPOInfo.h"
+
+class AnalysisThread : public QThread
+{
+	Q_OBJECT
+
+public:
+	AnalysisThread();
+	~AnalysisThread();
+	void setParameters(DeviceAPOInfo* device, int channelMask, int channelIndex, QString configPath, int frameCount);
+	void beginGetResult();
+	void endGetResult();
+
+	fftwf_complex* getFreqData() const;
+	int getFreqDataLength() const;
+	int getFreqDataSampleRate() const;
+	double getPeakGain() const;
+	int getLatency() const;
+	double getInitializationTime() const;
+	double getProcessingTime() const;
+	int getProcessedFrames() const;
+
+signals:
+	void analysisFinished();
+
+protected:
+	void run() override;
+
+private:
+	QMutex mutex;
+	QWaitCondition condition;
+	bool quit = false;
+
+	// input
+	DeviceAPOInfo device;
+	int channelMask;
+	int channelIndex;
+	QString configPath;
+	int frameCount = 0;
+
+	// output
+	fftwf_complex* resultFreqData = NULL;
+	int freqDataLength = 0;
+	int freqDataSampleRate;
+	double peakGain;
+	int latency;
+	double initializationTime;
+	double processingTime;
+	int processedFrames;
+
+	// internal (not protected by mutex)
+	int lastFrameCount = -1;
+	int lastChannelCount = -1;
+	float* buf = NULL;
+	float* buf2 = NULL;
+	float* timeData = NULL;
+	fftwf_complex* freqData = NULL;
+	fftwf_plan planForward = NULL;
+};