Remove crappy QPixmap* stored in Result, and replace with per-size cache

This avoids users having to do their own scaling + caching.

src/libtomahawk/Result.cpp

@@ -30,12 +30,24 @@
 
 #include "utils/TomahawkUtilsGui.h"
 #include "utils/Logger.h"
+#include "ExternalResolverGui.h"
 
 using namespace Tomahawk;
 
 static QHash< QString, QWeakPointer< Result > > s_results;
 static QMutex s_mutex;
 
+typedef QMap< QString, QPixmap > SourceIconCache;
+Q_GLOBAL_STATIC( SourceIconCache, sourceIconCache );
+static QMutex s_sourceIconMutex;
+
+inline QString sourceCacheKey( Resolver* resolver, const QSize& size )
+{
+    QString str;
+    QTextStream stream( &str );
+    stream << resolver << size.width() << size.height();
+    return str;
+}
 
 Tomahawk::result_ptr
 Result::get( const QString& url )
@@ -64,7 +76,6 @@ Result::isCached( const QString& url )
 Result::Result( const QString& url )
     : QObject()
     , m_url( url )
-    , m_sourceIcon( 0 )
     , m_duration( 0 )
     , m_bitrate( 0 )
     , m_size( 0 )
@@ -82,7 +93,6 @@ Result::Result( const QString& url )
 
 Result::~Result()
 {
-    delete m_sourceIcon;
 }
 
 
@@ -299,21 +309,37 @@ Result::friendlySource() const
 
 
 QPixmap
-Result::sourceIcon() const
+Result::sourceIcon( const QSize& desiredSize ) const
 {
     if ( collection().isNull() )
     {
-        if ( !m_sourceIcon )
+        const ExternalResolverGui* guiResolver = qobject_cast< ExternalResolverGui* >( m_resolvedBy.data() );
+        if ( !guiResolver )
             return QPixmap();
         else
-            return *m_sourceIcon;
+        {
+            QMutexLocker l( &s_sourceIconMutex );
+            const QString key = sourceCacheKey( m_resolvedBy.data(), desiredSize );
+            if ( !sourceIconCache()->contains( key ) )
+            {
+                QPixmap pixmap = guiResolver->icon();
+                if ( !desiredSize.isEmpty() )
+                    pixmap = pixmap.scaled( desiredSize, Qt::KeepAspectRatio, Qt::SmoothTransformation );
+                sourceIconCache()->insert( key, pixmap );
+                return pixmap;
+            }
+            else
+            {
+                return sourceIconCache()->value( key );
+            }
+        }
     }
     else
     {
-        QPixmap avatar = collection()->source()->avatar( Source::FancyStyle );
+        QPixmap avatar = collection()->source()->avatar( Source::FancyStyle, desiredSize );
         if ( !avatar )
         {
-            avatar = TomahawkUtils::defaultPixmap( TomahawkUtils::DefaultSourceAvatar, TomahawkUtils::AvatarInFrame );
+            avatar = TomahawkUtils::defaultPixmap( TomahawkUtils::DefaultSourceAvatar, TomahawkUtils::AvatarInFrame, desiredSize );
         }
         return avatar;
     }

src/libtomahawk/Result.h

@@ -24,6 +24,7 @@
 #include <QtGui/QPixmap>
 #include <QtCore/QSharedPointer>
 #include <QtCore/QVariant>
+#include <QMutex>
 
 #include "Typedefs.h"
 
@@ -72,7 +73,7 @@ public:
     QString url() const { return m_url; }
     QString mimetype() const { return m_mimetype; }
     QString friendlySource() const;
-    QPixmap sourceIcon() const;
+    QPixmap sourceIcon( const QSize& desiredSize = QSize() ) const;
     QString purchaseUrl() const { return m_purchaseUrl; }
     QString linkUrl() const { return m_linkUrl; }
 
@@ -105,9 +106,6 @@ public:
     void setYear( unsigned int year ) { m_year = year; }
     void setDiscNumber( unsigned int discnumber ) { m_discnumber = discnumber; }
 
-    // Takes ownership of the pixmap
-    void setSourceIcon( QPixmap* i ) { m_sourceIcon = i; }
-
     QVariantMap attributes() const { return m_attributes; }
     void setAttributes( const QVariantMap& map ) { m_attributes = map; updateAttributes(); }
 
@@ -149,8 +147,6 @@ private:
     QString m_mimetype;
     QString m_friendlySource;
 
-    QPixmap* m_sourceIcon;
-
     unsigned int m_duration;
     unsigned int m_bitrate;
     unsigned int m_size;

src/libtomahawk/resolvers/QtScriptResolver.cpp

@@ -432,7 +432,6 @@ QtScriptResolver::parseResultVariantList( const QVariantList& reslist )
         rp->setSize( m.value( "size" ).toUInt() );
         rp->setRID( uuid() );
         rp->setFriendlySource( name() );
-        rp->setSourceIcon( new QPixmap( icon() ) );
         rp->setPurchaseUrl( m.value( "purchaseUrl" ).toString() );
         rp->setLinkUrl( m.value( "linkUrl" ).toString() );
         rp->setScore( m.value( "score" ).toFloat() );

src/libtomahawk/resolvers/ScriptResolver.cpp

@@ -282,7 +282,6 @@ ScriptResolver::handleMsg( const QByteArray& msg )
             rp->setSize( m.value( "size" ).toUInt() );
             rp->setRID( uuid() );
             rp->setFriendlySource( m_name );
-            rp->setSourceIcon( new QPixmap( m_icon ) );
             rp->setPurchaseUrl( m.value( "purchaseUrl" ).toString() );
             rp->setLinkUrl( m.value( "linkUrl" ).toString() );
             rp->setYear( m.value( "year").toUInt() );