Added: High DPI support for the Configuration Editor. Icons and proportions should look better now when DPI scaling is used.

Improved: Updated Qt to version 5.7
Fixed: The GUI for the Channel command was showing the wrong channels as selected when channel numbers were used instead of names.

Editor/helpers/DPIHelper.cpp

@@ -0,0 +1,70 @@
+/*
+    This file is part of EqualizerAPO, a system-wide equalizer.
+    Copyright (C) 2016  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 "DPIHelper.h"
+
+#include <QApplication>
+#include <QFont>
+#include <QFontMetrics>
+#include <QScreen>
+
+QSize DPIHelper::scale(QSize size)
+{
+	if (qApp->testAttribute(Qt::AA_Use96Dpi))
+		return size;
+
+	qreal dpi = QGuiApplication::primaryScreen()->logicalDotsPerInchX();
+	return QSize(qRound(size.width() * dpi / 96), qRound(size.height() * dpi / 96));
+}
+
+int DPIHelper::scale(double pixel)
+{
+	if (qApp->testAttribute(Qt::AA_Use96Dpi))
+		return qRound(pixel);
+
+	qreal dpi = QGuiApplication::primaryScreen()->logicalDotsPerInchX();
+	return qRound(pixel * dpi / 96);
+}
+
+double DPIHelper::scaleZoom(double zoom)
+{
+	if (qApp->testAttribute(Qt::AA_Use96Dpi))
+		return zoom;
+
+	qreal dpi = QGuiApplication::primaryScreen()->logicalDotsPerInchX();
+	return zoom * dpi / 96;
+}
+
+double DPIHelper::invScale(int pixel)
+{
+	if (qApp->testAttribute(Qt::AA_Use96Dpi))
+		return pixel;
+
+	qreal dpi = QGuiApplication::primaryScreen()->logicalDotsPerInchX();
+	return pixel * 96 / dpi;
+}
+
+double DPIHelper::invScaleZoom(double zoom)
+{
+	if (qApp->testAttribute(Qt::AA_Use96Dpi))
+		return zoom;
+
+	qreal dpi = QGuiApplication::primaryScreen()->logicalDotsPerInchX();
+	return zoom * 96 / dpi;
+}