JDK-8089779 : Scrolling copyarea optimizations were disabled for HiDPI screens
  • Type: Bug
  • Component: javafx
  • Sub-Component: graphics
  • Affected Version: 8
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2013-01-26
  • Updated: 2018-09-05
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Other
tbdUnresolved
Related Reports
Blocks :  
JDK-8118192 - Node Orientation - ScrollPane does not scroll properly either vertially or horizonatally (goes blank)
Relates :  
JDK-8101788 - Support for Hi-DPI displays
Relates :  
JDK-8090038 - HiDPI support may read Screen attributes from the wrong threads
Description
The code that attempts to copy parts of a Node's cache to minimize repaints for horizontal and vertically scrolled panes did not work on pixel-scaled hardware due to an assumption built in to the code.  For now, this code was disabled in the impl_scrollCacheCapable() method if any screen is more than 72DPI, but with proper support in the cache-copying code, this restriction could be removed and scrolling optimizations restored on Retina-screened macs.
Comments
Too late to fix P4 bugs for FX 8.
01-11-2013
Note that the support for disabling this optimization depends on code that may not be properly thread-aware as detailed in RT-27958. If the issues prevent this optimization are fixed, then there is one less dependency on the code described in RT-27958.
26-01-2013
The checkin for RT-24009 was where the optimizations were disabled. Note that the optimizations are still enabled for the vast majority of systems where all screens are effectively non-pixel-scaled.
26-01-2013