text tiling

text tiling

If the length of text is very long and exceeds maxTextureSize,
it cannot be displayed on the screen.

So tiling is required.
I implement tiling by attaching multiple renderers.

And the MAX_TEXT_LENGTH limit is removed.

sample)

    std::ifstream file;
    file.open(PATH[0]);
    std::stringstream ss;
    ss << file.rdbuf();
    file.close();

    ScrollView scroller = ScrollView::New();
    scroller.SetPosition( 100.f, 100.f);
    scroller.SetSize(500.f, 1000.f);
    scroller.SetAnchorPoint(AnchorPoint::TOP_LEFT);
    scroller.SetParentOrigin(ParentOrigin::TOP_LEFT);
    scroller.SetAxisAutoLock(true);

    TextLabel textLabel = TextLabel::New( );
    textLabel.SetProperty( TextLabel::Property::TEXT,  ss.str() );
    textLabel.SetAnchorPoint( AnchorPoint::TOP_LEFT );
    textLabel.SetParentOrigin(ParentOrigin::TOP_LEFT);
    textLabel.SetProperty( TextLabel::Property::VERTICAL_ALIGNMENT, "TOP" );
    textLabel.SetProperty( TextLabel::Property::MULTI_LINE, true );
    textLabel.SetProperty( TextLabel::Property::ELLIPSIS, false );
    textLabel.SetProperty( TextLabel::Property::ENABLE_MARKUP, true );
    textLabel.SetProperty( TextLabel::Property::POINT_SIZE, 16);
    textLabel.SetProperty( Toolkit::TextLabel::Property::TEXT_COLOR, Color::BLUE );

    scroller.Add( textLabel );
    stage.Add( scroller );

Change-Id: I65082244a801ba697fd9ab0b598c82e702c2a948