workaround a weird gcc optimization werror bug

gcc (GCC) 4.9.2 20141101 (Red Hat 4.9.2-1)

framework/source/fwe/classes/addonsoptions.cxx: In member function ‘void framework::AddonsOptions_Impl::ReadAndAssociateImages(const rtl::OUString&, const rtl::OUString&)’:
framework/source/fwe/classes/addonsoptions.cxx:267:16: error: array subscript is above array bounds [-Werror=array-bounds]
         struct ImageEntry
                ^

The combination of aScaled[2]; aImage[2]; aURL[2] in sequence apparently lead
to some overoptimization and/or alignment problem, already declaring aImage[3]
helped (but not aScaled[3]), but that's not what we want.

Change-Id: I82e28d4887ab8072a17d0a9341d322c1cf61aedc

framework/source/fwe/classes/addonsoptions.cxx

@@ -217,19 +217,24 @@ class AddonsOptions_Impl : public ConfigItem
     private:
         enum ImageSize
         {
-            IMGSIZE_SMALL,
+            IMGSIZE_SMALL = 0,
             IMGSIZE_BIG
         };
 
+        struct OneImageEntry
+        {
+            Image    aScaled;   ///< cached scaled image
+            Image    aImage;    ///< original un-scaled image
+            OUString aURL;      ///< URL in case it is not loaded yet
+        };
+
         struct ImageEntry
         {
             // if the image is set, it was embedded in some way,
             // otherwise we use the associated URL to load on demand
 
             // accessed in this order
-            Image    aScaled[2];       // cached scaled images
-            Image    aImage[2];        // original un-scaled images
-            OUString aURL[2];         // URLs in case they are not loaded yet
+            OneImageEntry aSizeEntry[2];
             ImageEntry() {}
             void addImage(ImageSize eSize, const Image &rImage, const OUString &rURL);
         };
@@ -309,8 +314,8 @@ void AddonsOptions_Impl::ImageEntry::addImage(ImageSize eSize,
                                               const Image &rImage,
                                               const OUString &rURL)
 {
-    aImage[(int)eSize] = rImage;
-    aURL[(int)eSize] = rURL;
+    aSizeEntry[(int)eSize].aImage = rImage;
+    aSizeEntry[(int)eSize].aURL = rURL;
 }
 
 //  constructor
@@ -505,35 +510,36 @@ Image AddonsOptions_Impl::GetImageFromURL( const OUString& aURL, bool bBig, bool
     ImageManager::iterator pIter = m_aImageManager.find(aURL);
     if ( pIter != m_aImageManager.end() )
     {
-        ImageEntry &rEntry = pIter->second;
+        OneImageEntry& rSizeEntry = pIter->second.aSizeEntry[nIdx];
+        OneImageEntry& rOtherEntry = pIter->second.aSizeEntry[nOtherIdx];
         // actually read the image ...
-        if (!rEntry.aImage[nIdx])
-            rEntry.aImage[nIdx] = ReadImageFromURL(rEntry.aURL[nIdx]);
+        if (!rSizeEntry.aImage)
+            rSizeEntry.aImage = ReadImageFromURL(rSizeEntry.aURL);
 
-        if (!rEntry.aImage[nIdx])
+        if (!rSizeEntry.aImage)
         { // try the other size and scale it
-            aImage = ScaleImage(ReadImageFromURL(rEntry.aURL[nOtherIdx]), bBig);
-            rEntry.aImage[nIdx] = aImage;
-            if (!rEntry.aImage[nIdx])
+            aImage = ScaleImage(ReadImageFromURL(rOtherEntry.aURL), bBig);
+            rSizeEntry.aImage = aImage;
+            if (!rSizeEntry.aImage)
                 SAL_WARN("fwk", "failed to load addons image " << aURL);
         }
 
         // FIXME: bNoScale is not terribly meaningful or useful
 
         if (!aImage && bNoScale)
-            aImage = rEntry.aImage[nIdx];
+            aImage = rSizeEntry.aImage;
 
-        if (!aImage && !!rEntry.aScaled[nIdx])
-            aImage = rEntry.aScaled[nIdx];
+        if (!aImage && !!rSizeEntry.aScaled)
+            aImage = rSizeEntry.aScaled;
 
         else // scale to the correct size for the theme / toolbox
         {
-            aImage = rEntry.aImage[nIdx];
+            aImage = rSizeEntry.aImage;
             if (!aImage) // use and scale the other if one size is missing
-                aImage = rEntry.aImage[nOtherIdx];
+                aImage = rOtherEntry.aImage;
 
             aImage = ScaleImage(aImage, bBig);
-            rEntry.aScaled[nIdx] = aImage; // cache for next time
+            rSizeEntry.aScaled = aImage; // cache for next time
         }
     }