GH-796 Icon theme loading workaround

Replacing the Qt machinery with other Qt machinery under our control

31 files changed, 1578 insertions, 552 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69af0136..fff6e61e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -254,6 +254,10 @@ add_subdirectory(mmc_updater)
 add_subdirectory(depends/LogicalGui)
 include_directories(${LOGICALGUI_INCLUDE_DIR})
 
+# Add the GUI -> Logic connection header
+add_subdirectory(depends/iconfix)
+include_directories(${ICONFIX_INCLUDE_DIR})
+
 ################################ FILES ################################
 
 ######## Sources and headers ########
@@ -638,9 +642,6 @@ SET(MULTIMC_SOURCES
 
 ######## UIs ########
 SET(MULTIMC_UIS
-	# Windows
-	gui/MainWindow.ui
-
 	# Option pages
 	gui/pages/VersionPage.ui
 	gui/pages/ModFolderPage.ui
@@ -741,7 +742,7 @@ add_executable(MultiMC MACOSX_BUNDLE WIN32 main.cpp ${MULTIMC_RCS})
 
 # Link
 target_link_libraries(MultiMC MultiMC_common)
-target_link_libraries(MultiMC_common xz-embedded unpack200 libUtil LogicalGui ${QUAZIP_LIBRARIES} ${MultiMC_LINK_ADDITIONAL_LIBS})
+target_link_libraries(MultiMC_common xz-embedded unpack200 iconfix libUtil LogicalGui ${QUAZIP_LIBRARIES} ${MultiMC_LINK_ADDITIONAL_LIBS})
 qt5_use_modules(MultiMC Core Widgets Network Xml Concurrent WebKitWidgets ${MultiMC_QT_ADDITIONAL_MODULES})
 qt5_use_modules(MultiMC_common Core Widgets Network Xml Concurrent WebKitWidgets ${MultiMC_QT_ADDITIONAL_MODULES})
 
diff --git a/MultiMC.cpp b/MultiMC.cpp
index d2a5e29b..abb30225 100644
--- a/MultiMC.cpp
+++ b/MultiMC.cpp
@@ -39,6 +39,7 @@
 
 #include "pathutils.h"
 #include "cmdutils.h"
+#include <xdgicon.h>
 #include "logic/settings/INISettingsObject.h"
 #include "logic/settings/Setting.h"
 #include "logger/QsLog.h"
@@ -739,6 +740,16 @@ void MultiMC::installUpdates(const QString updateFilesDir, UpdateFlags flags)
 	MMC->quit();
 }
 
+void MultiMC::setIconTheme(const QString& name)
+{
+	XdgIcon::setThemeName(name);
+}
+
+QIcon MultiMC::getThemedIcon(const QString& name)
+{
+	return XdgIcon::fromTheme(name);
+}
+
 void MultiMC::onExit()
 {
 	if (m_updateOnExitPath.size())
diff --git a/MultiMC.h b/MultiMC.h
index dc63ea53..bce8a53b 100644
--- a/MultiMC.h
+++ b/MultiMC.h
@@ -5,6 +5,7 @@
 #include "logger/QsLog.h"
 #include "logger/QsLogDest.h"
 #include <QFlag>
+#include <QIcon>
 
 class MinecraftVersionList;
 class LWJGLVersionList;
@@ -72,6 +73,10 @@ public:
 
 	std::shared_ptr<IconList> icons();
 
+	QIcon getThemedIcon(const QString& name);
+
+	void setIconTheme(const QString& name);
+
 	Status status()
 	{
 		return m_status;
diff --git a/depends/iconfix/CMakeLists.txt b/depends/iconfix/CMakeLists.txt
new file mode 100644
index 00000000..53d8c28e
--- /dev/null
+++ b/depends/iconfix/CMakeLists.txt
@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 2.8.11)
+project(iconfix)
+
+find_package(Qt5Core REQUIRED QUIET)
+find_package(Qt5Widgets REQUIRED QUIET)
+
+include_directories(${Qt5Core_INCLUDE_DIRS})
+include_directories(${Qt5Widgets_INCLUDE_DIRS})
+
+set(ICONFIX_SOURCES
+xdgicon.h
+xdgicon.cpp
+internal/qhexstring_p.h
+internal/qiconloader.cpp
+internal/qiconloader_p.h
+)
+
+set(ICONFIX_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}" PARENT_SCOPE)
+add_library(iconfix STATIC ${ICONFIX_SOURCES})
+qt5_use_modules(iconfix Core Widgets)
diff --git a/depends/iconfix/internal/qhexstring_p.h b/depends/iconfix/internal/qhexstring_p.h
new file mode 100644
index 00000000..f01b4cdd
--- /dev/null
+++ b/depends/iconfix/internal/qhexstring_p.h
@@ -0,0 +1,100 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qpoint.h>
+#include <QtCore/qstring.h>
+#include <QtGui/qpolygon.h>
+#include <QtCore/qstringbuilder.h>
+
+#pragma once
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+// internal helper. Converts an integer value to an unique string token
+template <typename T> struct HexString
+{
+	inline HexString(const T t) : val(t)
+	{
+	}
+
+	inline void write(QChar *&dest) const
+	{
+		const ushort hexChars[] = {'0', '1', '2', '3', '4', '5', '6', '7',
+								   '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+		const char *c = reinterpret_cast<const char *>(&val);
+		for (uint i = 0; i < sizeof(T); ++i)
+		{
+			*dest++ = hexChars[*c & 0xf];
+			*dest++ = hexChars[(*c & 0xf0) >> 4];
+			++c;
+		}
+	}
+	const T val;
+};
+
+// specialization to enable fast concatenating of our string tokens to a string
+template <typename T> struct QConcatenable<HexString<T>>
+{
+	typedef HexString<T> type;
+	enum
+	{
+		ExactSize = true
+	};
+	static int size(const HexString<T> &)
+	{
+		return sizeof(T) * 2;
+	}
+	static inline void appendTo(const HexString<T> &str, QChar *&out)
+	{
+		str.write(out);
+	}
+	typedef QString ConvertTo;
+};
diff --git a/depends/iconfix/internal/qiconloader.cpp b/depends/iconfix/internal/qiconloader.cpp
new file mode 100644
index 00000000..b1195893
--- /dev/null
+++ b/depends/iconfix/internal/qiconloader.cpp
@@ -0,0 +1,688 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia. For licensing terms and
+** conditions see http://qt.digia.com/licensing. For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights. These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "qiconloader_p.h"
+
+#include <QtGui/QIconEnginePlugin>
+#include <QtGui/QPixmapCache>
+#include <QtGui/QIconEngine>
+#include <QtGui/QPalette>
+#include <QtCore/QList>
+#include <QtCore/QHash>
+#include <QtCore/QDir>
+#include <QtCore/QSettings>
+#include <QtGui/QPainter>
+#include <QApplication>
+#include <QLatin1Literal>
+
+#include "qhexstring_p.h"
+
+namespace QtXdg
+{
+
+Q_GLOBAL_STATIC(QIconLoader, iconLoaderInstance)
+
+/* Theme to use in last resort, if the theme does not have the icon, neither the parents  */
+
+static QString fallbackTheme()
+{
+	return QString("hicolor");
+}
+
+QIconLoader::QIconLoader() : m_themeKey(1), m_supportsSvg(false), m_initialized(false)
+{
+}
+
+// We lazily initialize the loader to make static icons
+// work. Though we do not officially support this.
+
+static inline QString systemThemeName()
+{
+	return QIcon::themeName();
+}
+
+static inline QStringList systemIconSearchPaths()
+{
+	auto paths = QIcon::themeSearchPaths();
+	paths.push_front(":/icons");
+	return paths;
+}
+
+void QIconLoader::ensureInitialized()
+{
+	if (!m_initialized)
+	{
+		m_initialized = true;
+
+		Q_ASSERT(qApp);
+
+		m_systemTheme = QIcon::themeName();
+
+		if (m_systemTheme.isEmpty())
+			m_systemTheme = fallbackTheme();
+		m_supportsSvg = true;
+	}
+}
+
+QIconLoader *QIconLoader::instance()
+{
+	iconLoaderInstance()->ensureInitialized();
+	return iconLoaderInstance();
+}
+
+// Queries the system theme and invalidates existing
+// icons if the theme has changed.
+void QIconLoader::updateSystemTheme()
+{
+	// Only change if this is not explicitly set by the user
+	if (m_userTheme.isEmpty())
+	{
+		QString theme = systemThemeName();
+		if (theme.isEmpty())
+			theme = fallbackTheme();
+		if (theme != m_systemTheme)
+		{
+			m_systemTheme = theme;
+			invalidateKey();
+		}
+	}
+}
+
+void QIconLoader::setThemeName(const QString &themeName)
+{
+	m_userTheme = themeName;
+	invalidateKey();
+}
+
+void QIconLoader::setThemeSearchPath(const QStringList &searchPaths)
+{
+	m_iconDirs = searchPaths;
+	themeList.clear();
+	invalidateKey();
+}
+
+QStringList QIconLoader::themeSearchPaths() const
+{
+	if (m_iconDirs.isEmpty())
+	{
+		m_iconDirs = systemIconSearchPaths();
+	}
+	return m_iconDirs;
+}
+
+QIconTheme::QIconTheme(const QString &themeName) : m_valid(false)
+{
+	QFile themeIndex;
+
+	QStringList iconDirs = systemIconSearchPaths();
+	for (int i = 0; i < iconDirs.size(); ++i)
+	{
+		QDir iconDir(iconDirs[i]);
+		QString themeDir = iconDir.path() + QLatin1Char('/') + themeName;
+		themeIndex.setFileName(themeDir + QLatin1String("/index.theme"));
+		if (themeIndex.exists())
+		{
+			m_contentDir = themeDir;
+			m_valid = true;
+
+			foreach (QString path, iconDirs)
+			{
+				if (QFileInfo(path).isDir())
+					m_contentDirs.append(path + QLatin1Char('/') + themeName);
+			}
+
+			break;
+		}
+	}
+
+	// if there is no index file, abscond.
+	if (!themeIndex.exists())
+		return;
+
+	// otherwise continue reading index file
+	const QSettings indexReader(themeIndex.fileName(), QSettings::IniFormat);
+	QStringListIterator keyIterator(indexReader.allKeys());
+	while (keyIterator.hasNext())
+	{
+		const QString key = keyIterator.next();
+		if (!key.endsWith(QLatin1String("/Size")))
+			continue;
+
+		// Note the QSettings ini-format does not accept
+		// slashes in key names, hence we have to cheat
+		int size = indexReader.value(key).toInt();
+		if (!size)
+			continue;
+
+		QString directoryKey = key.left(key.size() - 5);
+		QIconDirInfo dirInfo(directoryKey);
+		dirInfo.size = size;
+		QString type =
+			indexReader.value(directoryKey + QLatin1String("/Type")).toString();
+
+		if (type == QLatin1String("Fixed"))
+			dirInfo.type = QIconDirInfo::Fixed;
+		else if (type == QLatin1String("Scalable"))
+			dirInfo.type = QIconDirInfo::Scalable;
+		else
+			dirInfo.type = QIconDirInfo::Threshold;
+
+		dirInfo.threshold =
+			indexReader.value(directoryKey + QLatin1String("/Threshold"), 2)
+				.toInt();
+
+		dirInfo.minSize =
+			indexReader.value(directoryKey + QLatin1String("/MinSize"), size)
+				.toInt();
+
+		dirInfo.maxSize =
+			indexReader.value(directoryKey + QLatin1String("/MaxSize"), size)
+				.toInt();
+		m_keyList.append(dirInfo);
+	}
+
+	// Parent themes provide fallbacks for missing icons
+	m_parents = indexReader.value(QLatin1String("Icon Theme/Inherits")).toStringList();
+	m_parents.removeAll(QString());
+
+	// Ensure a default platform fallback for all themes
+	if (m_parents.isEmpty())
+	{
+		const QString fallback = fallbackTheme();
+		if (!fallback.isEmpty())
+			m_parents.append(fallback);
+	}
+
+	// Ensure that all themes fall back to hicolor
+	if (!m_parents.contains(QLatin1String("hicolor")))
+		m_parents.append(QLatin1String("hicolor"));
+}
+
+QThemeIconEntries QIconLoader::findIconHelper(const QString &themeName, const QString &iconName,
+											  QStringList &visited) const
+{
+	QThemeIconEntries entries;
+	Q_ASSERT(!themeName.isEmpty());
+
+	QPixmap pixmap;
+
+	// Used to protect against potential recursions
+	visited << themeName;
+
+	QIconTheme theme = themeList.value(themeName);
+	if (!theme.isValid())
+	{
+		theme = QIconTheme(themeName);
+		if (!theme.isValid())
+			theme = QIconTheme(fallbackTheme());
+
+		themeList.insert(themeName, theme);
+	}
+
+	QStringList contentDirs = theme.contentDirs();
+	const QVector<QIconDirInfo> subDirs = theme.keyList();
+
+	const QString svgext(QLatin1String(".svg"));
+	const QString pngext(QLatin1String(".png"));
+	const QString xpmext(QLatin1String(".xpm"));
+
+	// Add all relevant files
+	for (int i = 0; i < subDirs.size(); ++i)
+	{
+		const QIconDirInfo &dirInfo = subDirs.at(i);
+		QString subdir = dirInfo.path;
+
+		foreach (QString contentDir, contentDirs)
+		{
+			QDir currentDir(contentDir + '/' + subdir);
+
+			if (currentDir.exists(iconName + pngext))
+			{
+				PixmapEntry *iconEntry = new PixmapEntry;
+				iconEntry->dir = dirInfo;
+				iconEntry->filename = currentDir.filePath(iconName + pngext);
+				// Notice we ensure that pixmap entries always come before
+				// scalable to preserve search order afterwards
+				entries.prepend(iconEntry);
+			}
+			else if (m_supportsSvg && currentDir.exists(iconName + svgext))
+			{
+				ScalableEntry *iconEntry = new ScalableEntry;
+				iconEntry->dir = dirInfo;
+				iconEntry->filename = currentDir.filePath(iconName + svgext);
+				entries.append(iconEntry);
+				break;
+			}
+			else if (currentDir.exists(iconName + xpmext))
+			{
+				PixmapEntry *iconEntry = new PixmapEntry;
+				iconEntry->dir = dirInfo;
+				iconEntry->filename = currentDir.filePath(iconName + xpmext);
+				// Notice we ensure that pixmap entries always come before
+				// scalable to preserve search order afterwards
+				entries.append(iconEntry);
+				break;
+			}
+		}
+	}
+
+	if (entries.isEmpty())
+	{
+		const QStringList parents = theme.parents();
+		// Search recursively through inherited themes
+		for (int i = 0; i < parents.size(); ++i)
+		{
+
+			const QString parentTheme = parents.at(i).trimmed();
+
+			if (!visited.contains(parentTheme)) // guard against recursion
+				entries = findIconHelper(parentTheme, iconName, visited);
+
+			if (!entries.isEmpty()) // success
+				break;
+		}
+	}
+
+/*********************************************************************
+Author: Kaitlin Rupert <kaitlin.rupert@intel.com>
+Date: Aug 12, 2010
+Description: Make it so that the QIcon loader honors /usr/share/pixmaps
+			 directory.  This is a valid directory per the Freedesktop.org
+			 icon theme specification.
+Bug: https://bugreports.qt.nokia.com/browse/QTBUG-12874
+ *********************************************************************/
+#ifdef Q_OS_LINUX
+	/* Freedesktop standard says to look in /usr/share/pixmaps last */
+	if (entries.isEmpty())
+	{
+		const QString pixmaps(QLatin1String("/usr/share/pixmaps"));
+
+		QDir currentDir(pixmaps);
+		QIconDirInfo dirInfo(pixmaps);
+		if (currentDir.exists(iconName + pngext))
+		{
+			PixmapEntry *iconEntry = new PixmapEntry;
+			iconEntry->dir = dirInfo;
+			iconEntry->filename = currentDir.filePath(iconName + pngext);
+			// Notice we ensure that pixmap entries always come before
+			// scalable to preserve search order afterwards
+			entries.prepend(iconEntry);
+		}
+		else if (m_supportsSvg && currentDir.exists(iconName + svgext))
+		{
+			ScalableEntry *iconEntry = new ScalableEntry;
+			iconEntry->dir = dirInfo;
+			iconEntry->filename = currentDir.filePath(iconName + svgext);
+			entries.append(iconEntry);
+		}
+		else if (currentDir.exists(iconName + xpmext))
+		{
+			PixmapEntry *iconEntry = new PixmapEntry;
+			iconEntry->dir = dirInfo;
+			iconEntry->filename = currentDir.filePath(iconName + xpmext);
+			// Notice we ensure that pixmap entries always come before
+			// scalable to preserve search order afterwards
+			entries.append(iconEntry);
+		}
+	}
+#endif
+
+	if (entries.isEmpty())
+	{
+		// Search for unthemed icons in main dir of search paths
+		QStringList themeSearchPaths = QIcon::themeSearchPaths();
+		foreach (QString contentDir, themeSearchPaths)
+		{
+			QDir currentDir(contentDir);
+
+			if (currentDir.exists(iconName + pngext))
+			{
+				PixmapEntry *iconEntry = new PixmapEntry;
+				iconEntry->filename = currentDir.filePath(iconName + pngext);
+				// Notice we ensure that pixmap entries always come before
+				// scalable to preserve search order afterwards
+				entries.prepend(iconEntry);
+			}
+			else if (m_supportsSvg && currentDir.exists(iconName + svgext))
+			{
+				ScalableEntry *iconEntry = new ScalableEntry;
+				iconEntry->filename = currentDir.filePath(iconName + svgext);
+				entries.append(iconEntry);
+				break;
+			}
+			else if (currentDir.exists(iconName + xpmext))
+			{
+				PixmapEntry *iconEntry = new PixmapEntry;
+				iconEntry->filename = currentDir.filePath(iconName + xpmext);
+				// Notice we ensure that pixmap entries always come before
+				// scalable to preserve search order afterwards
+				entries.append(iconEntry);
+				break;
+			}
+		}
+	}
+	return entries;
+}
+
+QThemeIconEntries QIconLoader::loadIcon(const QString &name) const
+{
+	if (!themeName().isEmpty())
+	{
+		QStringList visited;
+		return findIconHelper(themeName(), name, visited);
+	}
+
+	return QThemeIconEntries();
+}
+
+// -------- Icon Loader Engine -------- //
+
+QIconLoaderEngineFixed::QIconLoaderEngineFixed(const QString &iconName)
+	: m_iconName(iconName), m_key(0)
+{
+}
+
+QIconLoaderEngineFixed::~QIconLoaderEngineFixed()
+{
+	qDeleteAll(m_entries);
+}
+
+QIconLoaderEngineFixed::QIconLoaderEngineFixed(const QIconLoaderEngineFixed &other)
+	: QIconEngine(other), m_iconName(other.m_iconName), m_key(0)
+{
+}
+
+QIconEngine *QIconLoaderEngineFixed::clone() const
+{
+	return new QIconLoaderEngineFixed(*this);
+}
+
+bool QIconLoaderEngineFixed::read(QDataStream &in)
+{
+	in >> m_iconName;
+	return true;
+}
+
+bool QIconLoaderEngineFixed::write(QDataStream &out) const
+{
+	out << m_iconName;
+	return true;
+}
+
+bool QIconLoaderEngineFixed::hasIcon() const
+{
+	return !(m_entries.isEmpty());
+}
+
+// Lazily load the icon
+void QIconLoaderEngineFixed::ensureLoaded()
+{
+	if (!(QIconLoader::instance()->themeKey() == m_key))
+	{
+
+		qDeleteAll(m_entries);
+
+		m_entries = QIconLoader::instance()->loadIcon(m_iconName);
+		m_key = QIconLoader::instance()->themeKey();
+	}
+}
+
+void QIconLoaderEngineFixed::paint(QPainter *painter, const QRect &rect, QIcon::Mode mode,
+								   QIcon::State state)
+{
+	QSize pixmapSize = rect.size();
+#if defined(Q_WS_MAC)
+	pixmapSize *= qt_mac_get_scalefactor();
+#endif
+	painter->drawPixmap(rect, pixmap(pixmapSize, mode, state));
+}
+
+/*
+ * This algorithm is defined by the freedesktop spec:
+ * http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html
+ */
+static bool directoryMatchesSize(const QIconDirInfo &dir, int iconsize)
+{
+	if (dir.type == QIconDirInfo::Fixed)
+	{
+		return dir.size == iconsize;
+	}
+	else if (dir.type == QIconDirInfo::Scalable)
+	{
+		return dir.size <= dir.maxSize && iconsize >= dir.minSize;
+	}
+	else if (dir.type == QIconDirInfo::Threshold)
+	{
+		return iconsize >= dir.size - dir.threshold && iconsize <= dir.size + dir.threshold;
+	}
+
+	Q_ASSERT(1); // Not a valid value
+	return false;
+}
+
+/*
+ * This algorithm is defined by the freedesktop spec:
+ * http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html
+ */
+static int directorySizeDistance(const QIconDirInfo &dir, int iconsize)
+{
+	if (dir.type == QIconDirInfo::Fixed)
+	{
+		return qAbs(dir.size - iconsize);
+	}
+	else if (dir.type == QIconDirInfo::Scalable)
+	{
+		if (iconsize < dir.minSize)
+			return dir.minSize - iconsize;
+		else if (iconsize > dir.maxSize)
+			return iconsize - dir.maxSize;
+		else
+			return 0;
+	}
+	else if (dir.type == QIconDirInfo::Threshold)
+	{
+		if (iconsize < dir.size - dir.threshold)
+			return dir.minSize - iconsize;
+		else if (iconsize > dir.size + dir.threshold)
+			return iconsize - dir.maxSize;
+		else
+			return 0;
+	}
+
+	Q_ASSERT(1); // Not a valid value
+	return INT_MAX;
+}
+
+QIconLoaderEngineEntry *QIconLoaderEngineFixed::entryForSize(const QSize &size)
+{
+	int iconsize = qMin(size.width(), size.height());
+
+	// Note that m_entries are sorted so that png-files
+	// come first
+
+	const int numEntries = m_entries.size();
+
+	// Search for exact matches first
+	for (int i = 0; i < numEntries; ++i)
+	{
+		QIconLoaderEngineEntry *entry = m_entries.at(i);
+		if (directoryMatchesSize(entry->dir, iconsize))
+		{
+			return entry;
+		}
+	}
+
+	// Find the minimum distance icon
+	int minimalSize = INT_MAX;
+	QIconLoaderEngineEntry *closestMatch = 0;
+	for (int i = 0; i < numEntries; ++i)
+	{
+		QIconLoaderEngineEntry *entry = m_entries.at(i);
+		int distance = directorySizeDistance(entry->dir, iconsize);
+		if (distance < minimalSize)
+		{
+			minimalSize = distance;
+			closestMatch = entry;
+		}
+	}
+	return closestMatch;
+}
+
+/*
+ * Returns the actual icon size. For scalable svg's this is equivalent
+ * to the requested size. Otherwise the closest match is returned but
+ * we can never return a bigger size than the requested size.
+ *
+ */
+QSize QIconLoaderEngineFixed::actualSize(const QSize &size, QIcon::Mode mode,
+										 QIcon::State state)
+{
+	ensureLoaded();
+
+	QIconLoaderEngineEntry *entry = entryForSize(size);
+	if (entry)
+	{
+		const QIconDirInfo &dir = entry->dir;
+		if (dir.type == QIconDirInfo::Scalable)
+			return size;
+		else
+		{
+			int result = qMin<int>(dir.size, qMin(size.width(), size.height()));
+			return QSize(result, result);
+		}
+	}
+	return QIconEngine::actualSize(size, mode, state);
+}
+
+QPixmap PixmapEntry::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+	Q_UNUSED(state);
+
+	// Ensure that basePixmap is lazily initialized before generating the
+	// key, otherwise the cache key is not unique
+	if (basePixmap.isNull())
+		basePixmap.load(filename);
+
+	QSize actualSize = basePixmap.size();
+	if (!actualSize.isNull() &&
+		(actualSize.width() > size.width() || actualSize.height() > size.height()))
+		actualSize.scale(size, Qt::KeepAspectRatio);
+
+	QString key = QLatin1String("$qt_theme_") % HexString<qint64>(basePixmap.cacheKey()) %
+				  HexString<int>(mode) %
+				  HexString<qint64>(QGuiApplication::palette().cacheKey()) %
+				  HexString<int>(actualSize.width()) % HexString<int>(actualSize.height());
+
+	QPixmap cachedPixmap;
+	if (QPixmapCache::find(key, &cachedPixmap))
+	{
+		return cachedPixmap;
+	}
+	else
+	{
+		if (basePixmap.size() != actualSize)
+		{
+			cachedPixmap = basePixmap.scaled(actualSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+		}
+		else
+		{
+			cachedPixmap = basePixmap;
+		}
+		QPixmapCache::insert(key, cachedPixmap);
+	}
+	return cachedPixmap;
+}
+
+QPixmap ScalableEntry::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+	if (svgIcon.isNull())
+	{
+		svgIcon = QIcon(filename);
+	}
+
+	// Simply reuse svg icon engine
+	return svgIcon.pixmap(size, mode, state);
+}
+
+QPixmap QIconLoaderEngineFixed::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+	ensureLoaded();
+
+	QIconLoaderEngineEntry *entry = entryForSize(size);
+	if (entry)
+	{
+		return entry->pixmap(size, mode, state);
+	}
+
+	return QPixmap();
+}
+
+QString QIconLoaderEngineFixed::key() const
+{
+	return QLatin1String("QIconLoaderEngineFixed");
+}
+
+void QIconLoaderEngineFixed::virtual_hook(int id, void *data)
+{
+	ensureLoaded();
+
+	switch (id)
+	{
+	case QIconEngine::AvailableSizesHook:
+	{
+		QIconEngine::AvailableSizesArgument &arg =
+			*reinterpret_cast<QIconEngine::AvailableSizesArgument *>(data);
+		const int N = m_entries.size();
+		QList<QSize> sizes;
+		sizes