applnk : lazy loading of mime type icons (load only when needed)

resource.cpp : print warning when requested image cannot be found
        and print the name of that image too

2 files changed, 54 insertions, 17 deletions

diff --git a/library/applnk.cpp b/library/applnk.cpp
index 1c1a227..80f2c62 100644
--- a/library/applnk.cpp
+++ b/library/applnk.cpp
@@ -981,17 +981,52 @@ void AppLnk::removeLinkFile()
     }
 }
 
+class AppLnkImagePrivate {
+public :
+      AppLnkImagePrivate( const QString & ImageName ) {
+        IconName = ImageName;
+        Small = 0;
+        Big = 0;
+      }
+      ~AppLnkImagePrivate( ) {
+        if ( Small ) delete Small;
+        if ( Big ) delete Big;
+      }
+
+      inline QPixmap * small( void ) {
+        if( ! Small ) {
+          QImage unscaledIcon = Resource::loadImage( IconName );
+          // works as long as smallSize remains static
+          Small = new QPixmap();
+          Small->convertFromImage( unscaledIcon.smoothScale( smallSize, smallSize ) );
+        }
+        return Small;
+      }
+
+      inline QPixmap * big( void ) {
+        if( ! Big ) {
+          QImage unscaledIcon = Resource::loadImage( IconName );
+          // works as long as bigSize remains static
+          Big = new QPixmap();
+          Big->convertFromImage( unscaledIcon.smoothScale( bigSize, bigSize ) );
+        }
+        return Big;
+      }
+
+      QString   IconName;
+      QPixmap * Small;
+      QPixmap * Big;
+};
+
 class AppLnkSetPrivate {
 public:
     AppLnkSetPrivate()
     {
   typPix.setAutoDelete(TRUE);
-  typPixBig.setAutoDelete(TRUE);
   typName.setAutoDelete(TRUE);
     }
 
-    QDict<QPixmap> typPix;
-    QDict<QPixmap> typPixBig;
+    QDict<AppLnkImagePrivate> typPix;
     QDict<QString> typName;
 };
 
@@ -1090,14 +1125,11 @@ void AppLnkSet::findChildren(const QString &dr, const QString& typ, const QStrin
   config.setGroup( "Desktop Entry" );
   typNameLocal = config.readEntry( "Name", typNameLocal );
   if ( !typ.isEmpty() ) {
-      QString iconFile = config.readEntry( "Icon", "AppsIcon" );
-      QImage unscaledIcon = Resource::loadImage( iconFile );
-      QPixmap pm, bpm;
-      pm.convertFromImage( unscaledIcon.smoothScale( smallSize, smallSize ) );
-      bpm.convertFromImage( unscaledIcon.smoothScale( bigSize, bigSize ) );
-      d->typPix.insert(typ, new QPixmap(pm));
-      d->typPixBig.insert(typ, new QPixmap(bpm));
+        d->typPix.insert( typ, 
+          new AppLnkImagePrivate( config.readEntry( "Icon", "AppsIcon" ) )
+        );
       d->typName.insert(typ, new QString(typNameLocal));
+
   }
     }
 
@@ -1192,8 +1224,8 @@ QString AppLnkSet::typeName( const QString& t ) const
 */
 QPixmap AppLnkSet::typePixmap( const QString& t ) const
 {
-    QPixmap *pm = d->typPix.find(t);
-    return pm ? *pm : QPixmap();
+    AppLnkImagePrivate *alip = d->typPix.find(t);
+    return alip ? *(alip->small()) : QPixmap();
 }
 
 /*!
@@ -1204,8 +1236,8 @@ QPixmap AppLnkSet::typePixmap( const QString& t ) const
 */
 QPixmap AppLnkSet::typeBigPixmap( const QString& t ) const
 {
-    QPixmap *pm = d->typPixBig.find(t);
-    return pm ? *pm : QPixmap();
+    AppLnkImagePrivate *alip = d->typPix.find(t);
+    return alip ? *(alip->big()) : QPixmap();
 }
 
 /*!
diff --git a/library/resource.cpp b/library/resource.cpp
index cfa0d26..b31876f 100644
--- a/library/resource.cpp
+++ b/library/resource.cpp
@@ -59,14 +59,20 @@ static bool g_notUseSet = ::getenv("OVERWRITE_ICON_SET");
   Returns the QPixmap called \a pix. You should avoid including
   any filename type extension (e.g. .png, .xpm).
 */
+#include <stdio.h>
 QPixmap Resource::loadPixmap( const QString &pix )
 {
-    QPixmap pm;
+    QPixmap pm; // null pixmap
     QString key="QPE_"+pix;
     if ( !QPixmapCache::find(key,pm) ) {
-	pm.convertFromImage(loadImage(pix));
+	QImage I = loadImage(pix);
+	if( I.isNull() ) {
+          qWarning( "Could not load %s", pix.latin1() );
+	} else {
+          pm.convertFromImage(I);
 	QPixmapCache::insert(key,pm);
     }
+    }
     return pm;
 }
 
@@ -101,7 +107,6 @@ QString Resource::findPixmap( const QString &pix )
     if ( QFile( f ).exists() )
 	return f;
 
-
     // All formats...
     QStrList fileFormats = QImageIO::inputFormats();
     QString ff = fileFormats.first();