kdeplasma-addons: do not use disk storage for preview images

plasma_engine_preview is not valid at all, even so KImageCache will create
it even of the engine is no more but disk cache is not the most efficient
and safe thing

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

kdeplasma-addons/dataengines/microblog/imagesource.cpp

@@ -25,12 +25,10 @@
 #include <QPainterPath>
 
 #include <KIO/Job>
-#include <KImageCache>
 
 ImageSource::ImageSource(QObject* parent)
     : Plasma::DataContainer(parent),
-      m_runningJobs(0),
-      m_imageCache(0)
+      m_runningJobs(0)
 {
     setObjectName(QLatin1String("UserImages"));
 }
@@ -44,28 +42,12 @@ void ImageSource::loadImage(const QString &who, const KUrl &url)
     if (who.isEmpty()) {
         return;
     }
-    if (!m_imageCache) {
-        m_imageCache = new KImageCache("plasma_engine_preview", 10485760); // Re-use previewengine's cache
-    }
 
     // Make sure we only start one job per user
     if (m_loadedPersons.contains(who)) {
         return;
     }
 
-    const QString cacheKey = who + "@" + url.pathOrUrl();
-
-    // Check if the image is in the cache, if so return it
-    QImage preview = QImage(QSize(48, 48), QImage::Format_ARGB32_Premultiplied);
-    preview.fill(Qt::transparent);
-    if (m_imageCache->findImage(cacheKey, &preview)) {
-        // cache hit
-        //kDebug() << "cache hit: " << cacheKey;
-        setData(who, polishImage(preview));
-        emit dataChanged();
-        checkForUpdate();
-        return;
-    }
     if (!url.isValid()) {
         return;
     }
@@ -118,8 +100,6 @@ void ImageSource::result(KJob *job)
         emit dataChanged();
         KIO::TransferJob* kiojob = dynamic_cast<KIO::TransferJob*>(job);
         const QString cacheKey = who + "@" + kiojob->url().pathOrUrl();
-
-        m_imageCache->insertImage(cacheKey, img);
     }
 
     m_jobs.remove(job);

kdeplasma-addons/dataengines/microblog/imagesource.h

@@ -29,7 +29,6 @@
 
 // forward declarations
 class KJob;
-class KImageCache;
 
 namespace KIO
 {
@@ -65,7 +64,6 @@ private:
     QList<QPair<QString, KUrl> > m_queuedJobs;
     QStringList m_loadedPersons;
     //Plasma::DataEngine::Data m_cachedData;
-    KImageCache* m_imageCache;
 };
 
 #endif

kdeplasma-addons/dataengines/microblog/usersource.h

@@ -31,7 +31,6 @@
 
 // forward declarations
 class KJob;
-class KImageCache;
 
 namespace KIO
 {