pollymc/libraries/iconfix/internal/qiconloader.cpp
2018-07-15 14:51:05 +02:00

689 lines
20 KiB
C++

/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:LGPL21$
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** use the contact form at http://qt.digia.com/contact-us.
**
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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****************************************************************************/
#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.reserve(N);
// Gets all sizes from the DirectoryInfo entries
for (int i = 0; i < N; ++i)
{
int size = m_entries.at(i)->dir.size;
sizes.append(QSize(size, size));
}
arg.sizes.swap(sizes); // commit
}
break;
case QIconEngine::IconNameHook:
{
QString &name = *reinterpret_cast<QString *>(data);
name = m_iconName;
}
break;
default:
QIconEngine::virtual_hook(id, data);
}
}
} // QtXdg