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https://issues.apache.org/jira/browse/FLEX-34556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14161594#comment-14161594
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Jorn Nolles commented on FLEX-34556:
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[~bigosmallm], the improved code (solution) is given in the issue description.
Could you (or anyone else from Apache Flex) take it from here?
> Starting an app in portrait on an iPad results in wrong DPI
> -----------------------------------------------------------
>
> Key: FLEX-34556
> URL: https://issues.apache.org/jira/browse/FLEX-34556
> Project: Apache Flex
> Issue Type: Bug
> Components: Mobile: MobileApplication, Spark: Application
> Affects Versions: Apache Flex 4.13.0
> Environment: iOS 5.1, iOS 7, iOS 8
> Reporter: Jorn Nolles
>
> *Reproduction*
> # Create an mobile project.
> # Set the 'applicationDPI' to '160'
> # Add some components
> # Now create a build for iOS
> Start the app on the iPad while holding it in 'landscape' mode:
> Result: all components are of the correct size
> Start the app on the iPad while holding it in 'portrait' mode:
> Result: the components are too small.
> *Problem*
> The mx.core.RuntimeDPIProvider has a bug while attempting to determine teh
> device width/hight (in function runtimeDPI).
> *Solution*
> Don't use 'stage.fullScreenWidth' but use Capabilities.screenResolutionX.
> {code}
> public function get runtimeDPI():Number
> {
> if (Platform.isIOS) // as isIPad returns false in the simulator
> {
> // The original code uses the stage width/height, which is not
> always set (if the app is started on an iPad in portrait)
> var scX:Number = Capabilities.screenResolutionX;
> var scY:Number = Capabilities.screenResolutionY;
>
> // Use the stage width/height only when debugging, because
> Capabilities reports the computer resolution
> if (Capabilities.isDebugger)
> {
> var root:DisplayObject = SystemManager.getSWFRoot(this);
> if (root && root.stage)
> {
> scX = root.stage.fullScreenWidth;
> scY = root.stage.fullScreenHeight;
> }
> }
>
> /* as of Dec 2013, iPad (resp. iPad retina) are the only iOS
> devices to have 1024 (resp. 2048) screen width or height
> cf
> http://en.wikipedia.org/wiki/List_of_displays_by_pixel_density#Apple
> * */
> if (scX == IPAD_MAX_EXTENT || scY == IPAD_MAX_EXTENT)
> return DPIClassification.DPI_160;
> else if ((scX == IPAD_RETINA_MAX_EXTENT || scY ==
> IPAD_RETINA_MAX_EXTENT))
> return DPIClassification.DPI_320;
> }
>
> return classifyDPI(Capabilities.screenDPI);
> }
> {code}
> *Workaround*
> Create an override on the runtimeDPI() getter...
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