hidpi: Blind fix - avoid double scaling by updating GetItemImage().

I guess some code uses GetItemImage(), and then SetItemImage() again.  To make
it work, scale the image down in the hidpi mode.

Change-Id: I1ce9fdb28564b829253d7a9c7eabb46019e68876

vcl/source/window/toolbox2.cxx

@@ -622,9 +622,17 @@ void ToolBox::InsertItem( sal_uInt16 nItemId, const Image& rImage,
     DBG_ASSERT( GetItemPos( nItemId ) == TOOLBOX_ITEM_NOTFOUND,
                 "ToolBox::InsertItem(): ItemId already exists" );
 
-    // Item anlegen und in die Liste einfuegen
-    mpData->m_aItems.insert( (nPos < mpData->m_aItems.size()) ? mpData->m_aItems.begin()+nPos : mpData->m_aItems.end(), ImplToolItem( nItemId, rImage, nBits ) );
-    SetItemImage(nItemId, rImage);
+    Image aImage(rImage);
+    if (GetDPIScaleFactor() > 1)
+    {
+        BitmapEx aBitmap(aImage.GetBitmapEx());
+        aBitmap.Scale(GetDPIScaleFactor(), GetDPIScaleFactor(), BMP_SCALE_FAST);
+        aImage = Image(aBitmap);
+    }
+
+    mpData->m_aItems.insert((nPos < mpData->m_aItems.size()) ? mpData->m_aItems.begin()+nPos : mpData->m_aItems.end(),
+            ImplToolItem(nItemId, aImage, nBits));
+
     mpData->ImplClearLayoutData();
 
     ImplInvalidate( sal_True );
@@ -644,9 +652,17 @@ void ToolBox::InsertItem( sal_uInt16 nItemId, const Image& rImage,
     DBG_ASSERT( GetItemPos( nItemId ) == TOOLBOX_ITEM_NOTFOUND,
                 "ToolBox::InsertItem(): ItemId already exists" );
 
-    // Item anlegen und in die Liste einfuegen
-    mpData->m_aItems.insert( (nPos < mpData->m_aItems.size()) ? mpData->m_aItems.begin()+nPos : mpData->m_aItems.end(), ImplToolItem( nItemId, rImage, ImplConvertMenuString( rText ), nBits ) );
-    SetItemImage(nItemId, rImage);
+    Image aImage(rImage);
+    if (GetDPIScaleFactor() > 1)
+    {
+        BitmapEx aBitmap(aImage.GetBitmapEx());
+        aBitmap.Scale(GetDPIScaleFactor(), GetDPIScaleFactor(), BMP_SCALE_FAST);
+        aImage = Image(aBitmap);
+    }
+
+    mpData->m_aItems.insert((nPos < mpData->m_aItems.size()) ? mpData->m_aItems.begin()+nPos : mpData->m_aItems.end(),
+            ImplToolItem(nItemId, aImage, ImplConvertMenuString(rText), nBits));
+
     mpData->ImplClearLayoutData();
 
     ImplInvalidate( sal_True );
@@ -1353,17 +1369,11 @@ void ToolBox::SetItemImage( sal_uInt16 nItemId, const Image& rImage )
     {
         Image aImage(rImage);
 
-        if ( GetDPIScaleFactor() > 1)
+        if (GetDPIScaleFactor() > 1)
         {
             BitmapEx aBitmap(aImage.GetBitmapEx());
-
-            // Some code calls this twice, so add a sanity check
-            // FIXME find out what that code is & fix accordingly
-            if (aBitmap.GetSizePixel().Width() < 32)
-            {
-                aBitmap.Scale(GetDPIScaleFactor(), GetDPIScaleFactor(), BMP_SCALE_FAST);
-                aImage = Image(aBitmap);
-            }
+            aBitmap.Scale(GetDPIScaleFactor(), GetDPIScaleFactor(), BMP_SCALE_FAST);
+            aImage = Image(aBitmap);
         }
 
         ImplToolItem* pItem = &mpData->m_aItems[nPos];
@@ -1487,7 +1497,20 @@ Image ToolBox::GetItemImage( sal_uInt16 nItemId ) const
     ImplToolItem* pItem = ImplGetItem( nItemId );
 
     if ( pItem )
-        return pItem->maImage;
+    {
+        Image aImage(pItem->maImage);
+
+        if (GetDPIScaleFactor() > 1)
+        {
+            // we have scaled everything we have inserted, so scale it back to
+            // the original size
+            BitmapEx aBitmap(aImage.GetBitmapEx());
+            aBitmap.Scale(1.0/GetDPIScaleFactor(), 1.0/GetDPIScaleFactor(), BMP_SCALE_FAST);
+            aImage = Image(aBitmap);
+        }
+
+        return aImage;
+    }
     else
         return Image();
 }