Provide scaled pixmaps by UIThemeManager

Avoid leaking the paths of the theme resource files outside of the theme support implementation.

PR #18269.

src/gui/aboutdialog.cpp

@@ -51,7 +51,7 @@ AboutDialog::AboutDialog(QWidget *parent)
     // Title
     m_ui->labelName->setText(QStringLiteral("<b><h2>qBittorrent " QBT_VERSION " (%1-bit)</h2></b>").arg(QT_POINTER_SIZE * 8));
 
-    m_ui->logo->setPixmap(Utils::Gui::scaledPixmapSvg(UIThemeManager::instance()->getIconPath(u"qbittorrent-tray"_qs), this, 32));
+    m_ui->logo->setPixmap(UIThemeManager::instance()->getScaledPixmap(u"qbittorrent-tray"_qs, 32));
 
     // About
     const QString aboutText =

src/gui/optionsdialog.cpp

@@ -884,11 +884,11 @@ void OptionsDialog::loadSpeedTabOptions()
     const auto *pref = Preferences::instance();
     const auto *session = BitTorrent::Session::instance();
 
-    m_ui->labelGlobalRate->setPixmap(Utils::Gui::scaledPixmapSvg(UIThemeManager::instance()->getIconPath(u"slow_off"_qs), this, Utils::Gui::mediumIconSize(this).height()));
+    m_ui->labelGlobalRate->setPixmap(UIThemeManager::instance()->getScaledPixmap(u"slow_off"_qs, Utils::Gui::mediumIconSize(this).height()));
     m_ui->spinUploadLimit->setValue(session->globalUploadSpeedLimit() / 1024);
     m_ui->spinDownloadLimit->setValue(session->globalDownloadSpeedLimit() / 1024);
 
-    m_ui->labelAltRate->setPixmap(Utils::Gui::scaledPixmapSvg(UIThemeManager::instance()->getIconPath(u"slow"_qs), this, Utils::Gui::mediumIconSize(this).height()));
+    m_ui->labelAltRate->setPixmap(UIThemeManager::instance()->getScaledPixmap(u"slow"_qs, Utils::Gui::mediumIconSize(this).height()));
     m_ui->spinUploadLimitAlt->setValue(session->altGlobalUploadSpeedLimit() / 1024);
     m_ui->spinDownloadLimitAlt->setValue(session->altGlobalDownloadSpeedLimit() / 1024);
 
@@ -1769,8 +1769,8 @@ void OptionsDialog::webUIHttpsCertChanged(const Path &path)
     };
 
     m_ui->textWebUIHttpsCert->setSelectedPath(path);
-    m_ui->lblSslCertStatus->setPixmap(Utils::Gui::scaledPixmapSvg(UIThemeManager::instance()->getIconPath(
+    m_ui->lblSslCertStatus->setPixmap(UIThemeManager::instance()->getScaledPixmap(
-        isCertFileValid() ? u"security-high"_qs : u"security-low"_qs), this, 24));
+        (isCertFileValid() ? u"security-high"_qs : u"security-low"_qs), 24));
 }
 
 void OptionsDialog::webUIHttpsKeyChanged(const Path &path)
@@ -1791,8 +1791,8 @@ void OptionsDialog::webUIHttpsKeyChanged(const Path &path)
     };
 
     m_ui->textWebUIHttpsKey->setSelectedPath(path);
-    m_ui->lblSslKeyStatus->setPixmap(Utils::Gui::scaledPixmapSvg(UIThemeManager::instance()->getIconPath(
+    m_ui->lblSslKeyStatus->setPixmap(UIThemeManager::instance()->getScaledPixmap(
-        isKeyFileValid() ? u"security-high"_qs : u"security-low"_qs), this, 24));
+        (isKeyFileValid() ? u"security-high"_qs : u"security-low"_qs), 24));
 }
 
 bool OptionsDialog::isWebUiEnabled() const

src/gui/speedlimitdialog.cpp

@@ -56,10 +56,10 @@ SpeedLimitDialog::SpeedLimitDialog(QWidget *parent)
 {
     m_ui->setupUi(this);
 
-    m_ui->labelGlobalSpeedIcon->setPixmap(Utils::Gui::scaledPixmapSvg(UIThemeManager::instance()->getIconPath(u"slow_off"_qs)
+    m_ui->labelGlobalSpeedIcon->setPixmap(
-                                                , this, Utils::Gui::mediumIconSize(this).height()));
+            UIThemeManager::instance()->getScaledPixmap(u"slow_off"_qs, Utils::Gui::mediumIconSize(this).height()));
-    m_ui->labelAltGlobalSpeedIcon->setPixmap(Utils::Gui::scaledPixmapSvg(UIThemeManager::instance()->getIconPath(u"slow"_qs)
+    m_ui->labelAltGlobalSpeedIcon->setPixmap(
-                                                , this, Utils::Gui::mediumIconSize(this).height()));
+            UIThemeManager::instance()->getScaledPixmap(u"slow"_qs, Utils::Gui::mediumIconSize(this).height()));
 
     const auto initSlider = [](QSlider *slider, const int value, const int maximum)
     {

src/gui/uithememanager.cpp

@@ -35,6 +35,7 @@
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QPalette>
+#include <QPixmapCache>
 #include <QResource>
 
 #include "base/global.h"
@@ -237,6 +238,25 @@ QIcon UIThemeManager::getFlagIcon(const QString &countryIsoCode) const
     return icon;
 }
 
+QPixmap UIThemeManager::getScaledPixmap(const QString &iconId, const int height) const
+{
+    // (workaround) svg images require the use of `QIcon()` to load and scale losslessly,
+    // otherwise other image classes will convert it to pixmap first and follow-up scaling will become lossy.
+
+    Q_ASSERT(height > 0);
+
+    const QString cacheKey = iconId + u'@' + QString::number(height);
+
+    QPixmap pixmap;
+    if (!QPixmapCache::find(cacheKey, &pixmap))
+    {
+        pixmap = getIcon(iconId).pixmap(height);
+        QPixmapCache::insert(cacheKey, pixmap);
+    }
+
+    return pixmap;
+}
+
 QColor UIThemeManager::getColor(const QString &id, const QColor &defaultColor) const
 {
     return m_colors.value(id, defaultColor);
@@ -272,28 +292,6 @@ QIcon UIThemeManager::getSystrayIcon() const
 }
 #endif
 
-Path UIThemeManager::getIconPath(const QString &iconId) const
-{
-#if (defined(Q_OS_UNIX) && !defined(Q_OS_MACOS))
-    if (m_useSystemIcons)
-    {
-        Path path = Utils::Fs::tempPath() / Path(iconId + u".png");
-        if (!path.exists())
-        {
-            const QIcon icon = QIcon::fromTheme(iconId);
-            if (!icon.isNull())
-                icon.pixmap(32).save(path.toString());
-            else
-                path = getIconPathFromResources(iconId);
-        }
-
-        return path;
-    }
-#endif
-
-    return getIconPathFromResources(iconId);
-}
-
 Path UIThemeManager::getIconPathFromResources(const QString &iconId) const
 {
     if (m_themeSource)

src/gui/uithememanager.h

@@ -34,6 +34,7 @@
 #include <QHash>
 #include <QIcon>
 #include <QObject>
+#include <QPixmap>
 #include <QString>
 
 #include "base/pathfwd.h"
@@ -58,9 +59,9 @@ public:
     static void freeInstance();
     static UIThemeManager *instance();
 
-    Path getIconPath(const QString &iconId) const;
     QIcon getIcon(const QString &iconId, const QString &fallback = {}) const;
     QIcon getFlagIcon(const QString &countryIsoCode) const;
+    QPixmap getScaledPixmap(const QString &iconId, int height) const;
 
     QColor getColor(const QString &id, const QColor &defaultColor) const;
 

src/gui/utils.cpp

@@ -81,26 +81,6 @@ QPixmap Utils::Gui::scaledPixmap(const Path &path, const QWidget *widget, const
     return (height == 0) ? pixmap : pixmap.scaledToHeight(height, Qt::SmoothTransformation);
 }
 
-QPixmap Utils::Gui::scaledPixmapSvg(const Path &path, const QWidget *widget, const int height)
-{
-    // (workaround) svg images require the use of `QIcon()` to load and scale losslessly,
-    // otherwise other image classes will convert it to pixmap first and follow-up scaling will become lossy.
-
-    Q_UNUSED(widget);
-    Q_ASSERT(height > 0);
-
-    const QString cacheKey = path.data() + u'@' + QString::number(height);
-
-    QPixmap pixmap;
-    QPixmapCache cache;
-    if (!cache.find(cacheKey, &pixmap))
-    {
-        pixmap = QIcon(path.data()).pixmap(height);
-        cache.insert(cacheKey, pixmap);
-    }
-    return pixmap;
-}
-
 QSize Utils::Gui::smallIconSize(const QWidget *widget)
 {
     // Get DPI scaled icon size (device-dependent), see QT source

src/gui/utils.h

@@ -42,7 +42,6 @@ namespace Utils::Gui
 
     QPixmap scaledPixmap(const QIcon &icon, const QWidget *widget, int height);
     QPixmap scaledPixmap(const Path &path, const QWidget *widget, int height = 0);
-    QPixmap scaledPixmapSvg(const Path &path, const QWidget *widget, int height);
 
     QSize smallIconSize(const QWidget *widget = nullptr);
     QSize mediumIconSize(const QWidget *widget = nullptr);