[jira] [Created] (FLEX-34653) Overriding RuntimeDPIProvider causes incorrect application scalling

[Jason Moore (JIRA)]

Jason Moore created FLEX-34653:
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             Summary: Overriding RuntimeDPIProvider causes incorrect 
application scalling
                 Key: FLEX-34653
                 URL: https://issues.apache.org/jira/browse/FLEX-34653
             Project: Apache Flex
          Issue Type: Bug
          Components: Layout - General, Skinning
    Affects Versions: Apache Flex 4.13.0
         Environment: Windows ( Possible Mac - Not checked ).
            Reporter: Jason Moore


The issue occurs when using automatic scaling and setting the application DPI 
and overriding the runtimeDPIProvider to set the runtimeDPI where it is 
incorrectly returned from the OS ( On desktop devices for instance ).

If the two values match ie 1:1 scaling, there is no issue. But if they differ 
then the application content is scalled correctly , but the stage size is also 
scaled, incorrect. This leads to the application being clipped when scaling up 
and excess space when scaling down.. See code excepts to recreate...
{code:title=ScaleIssue.mxml|borderStyle=solid}
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"; 
                                           
xmlns:s="library://ns.adobe.com/flex/spark" 
                                           
xmlns:mx="library://ns.adobe.com/flex/mx"
                                           applicationDPI="160"
                                           
runtimeDPIProvider="myRuntimeDPIProvider">
        
                <s:Label id="LeftMarker" left="0" verticalCenter="0" 
text="&lt;--- LEFT" fontSize="24"/>

                <s:Label id="MiddleMarker" horizontalCenter="0" 
verticalCenter="0" text="&gt; &gt; &gt; MIDDLE &lt; &lt; &lt;" fontSize="24"/>

                <s:Label id="RightMarker" right="0" verticalCenter="0" 
text="RIGHT ---&gt;" fontSize="24"/>
                                                         
</s:WindowedApplication>
{code}

{code:title=myRuntimeDPIProvider.as|borderStyle=solid}
package 
{
        
        import mx.core.DPIClassification;
        import mx.core.RuntimeDPIProvider;
        
        public class myRuntimeDPIProvider extends RuntimeDPIProvider
        {
                                
                /**
                 * Overrride getter function so we can set the dpi manually 
when running on desktop device
                 * This would normally be a bit more sophisticated... 
                 * 
                 * @return 
                 * 
                 */             
                override public function get runtimeDPI():Number
                {                       
                        return DPIClassification.DPI_240;
                }
                
        }
}
{code}

You should see the text labels pointing to the left and right screen edges.. 
but instead the right hand label is off screen.

Hope that makes sense.

J :)



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