Merge changes I7066e6c1,I3f0c228e into devel/master

* changes:
  Implement default height for width and width for height for visuals and remove obsolete code from ImageView
  Stop unnecessary copying of property maps in ImageView::SetImage

diff --combined dali-toolkit/internal/visuals/visual-base-impl.cpp
index 92cadd7,a8ae21c..0958afa
--- 1/dali-toolkit/internal/visuals/visual-base-impl.cpp
--- 2/dali-toolkit/internal/visuals/visual-base-impl.cpp
+++ b/dali-toolkit/internal/visuals/visual-base-impl.cpp
@@@ -90,7 -90,7 +90,7 @@@ void Visual::Base::SetProperties( cons
  
        case DevelVisual::Property::PREMULTIPLIED_ALPHA:
        {
 -        bool premultipliedAlpha( premultipliedAlpha );
 +        bool premultipliedAlpha = false;
          if( value.Get( premultipliedAlpha ) )
          {
            EnablePreMultipliedAlpha( premultipliedAlpha );
@@@ -120,9 -120,28 +120,28 @@@ const std::string& Visual::Base::GetNam
    return mImpl->mName;
  }
  
- float Visual::Base::GetHeightForWidth( float width ) const
+ float Visual::Base::GetHeightForWidth( float width )
  {
-   return 0.f;
+   float aspectCorrectedHeight = 0.f;
+   Vector2 naturalSize;
+   GetNaturalSize( naturalSize );
+   if( naturalSize.width )
+   {
+     aspectCorrectedHeight = naturalSize.height * width / naturalSize.width;
+   }
+   return aspectCorrectedHeight;
+ }
+ 
+ float Visual::Base::GetWidthForHeight( float height )
+ {
+   float aspectCorrectedWidth = 0.f;
+   Vector2 naturalSize;
+   GetNaturalSize( naturalSize );
+   if( naturalSize.height > 0.0f )
+   {
+     aspectCorrectedWidth = naturalSize.width * height / naturalSize.height;
+   }
+   return aspectCorrectedWidth;
  }
  
  void Visual::Base::GetNaturalSize( Vector2& naturalSize )