[FLEX-33989] ViewNavigatorBase discards MultiDPIBitmapSource information for icon when saving and re-loading view data

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Apache Flex 4.11.0
• Fix Version/s: Apache Flex 4.12.0
• Component/s: Mobile: ViewNavigator
• Labels: easyfix easytest
• Assignee: Justin Mclean
• Reporter: Vincent Spallek
• Created: 11/Dec/13 13:44
• Updated: 26/Dec/13 00:22
• Resolved: 26/Dec/13 00:22

Description

Steps to reproduce:

• Create a TabbedViewNavigatorApplication with applicationDPI set to 160 dpi
• Add a couple of ViewNavigator that have a MultiDPIBitmapSource as icon, and add icons for another resolution, e.g. 320 dpi
• Run on a device with that higher resolution
• Result: higher resolution icons will be loaded and displayed in the proper scale
• Stop the application and reload it
• Result: higher resolution icons will be loaded but not scaled properly, so they appear too large and with low resolution

Root cause: ViewNavigatorBase discards the MultiDPIBitmapSource information in saveViewData() and instead only saves the high resolution bitmap. After re-loading in ViewNavigatorBase.loadViewData(), only the bitmap is restored without the DPI information. Hence, BitmapImage etc. don't have sufficient information to properly scale the image, see BitmapImage.measure()