[9] Review request: 8091832: Provide API for getting the Screen scale on HiDPI screens

Jim Graham james.graham at oracle.com
Thu Mar 31 07:52:15 UTC 2016

I've updated the fix with the following additions:


- Redundant or obsolete command line overrides removed from Windows code 
as follows:
   Settings still supported:
   Settings no longer supported, implementation conflicts with 
Per-Monitor DPI support:
   Settings no longer supported, replaced by API in FX classes:

- Font size now scales with uiScale override on Windows
- Fixes to scaling in JFXPanel
- Fixes to scaling in SwingPanel
- Monocle Screen initialization fixed

Note that SwingNode does not seem to relay the FX scaling parameters to 
Swing correctly, but that was true before these fixes. This patch will 
keep the functionality roughly the same, but additional fixes are needed 
to do proper scaling of embedded Swing nodes. I looked at what was 
needed and have an idea of what the fix would involve, but decided that 
it was outside the scope of these fixes that are needed to get the HiDPI 
FX properties implemented.


On 3/28/16 6:25 PM, Jim Graham wrote:
> bug: https://bugs.openjdk.java.net/browse/JDK-8091832
> webrev: http://cr.openjdk.java.net/~flar/JDK-8091832/webrev.rt.00/
> This webrev fixes pixel snapping and application control over pixel
> scaling on HiDPI screens:
> - snap*() methods are all updated to take the current scale into account
> - new variants of snap*() methods are added for separate X/Y control:
>      Added: Region.snapSpaceX/Y()
>      Added: Region.snapSizeX/Y()
>      Added: Region.snapPositionX/Y()
> - the non-X/Y variants of the above methods are now deprecated:
>      Deprecated: Region.snapSpace()
>      Deprecated: Region.snapSize()
>      Deprecated: Region.snapPosition()
> - methods to query the scale values of Screen objects:
>      Added: Screen.getOutputScaleX/Y()
> - properties to query and/or modify the scale values of Window objects:
>      Added Read-Only  DoubleProperty:  Window.getOutputScaleX/Y()
>      Added Read-Write BooleanProperty:
> Window.set/getForceIntegerRenderScale()
>      Added Read-Write DoubleProperty:  Window.set/getRenderScaleX/Y()
> The changes have been compiled and tested on Windows and Mac and there
> were trivial changes needed to the Linux files to adapt to one new
> method signature, but I haven't done the test build on Linux yet...
>              ...jim

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