<AWT Dev>  Review Request: JDK-8159062 : [hidpi] DnD on Windows while scaling is non-integer
pankaj.b.bansal at oracle.com
Tue Oct 24 09:43:33 UTC 2017
Please review the fix for JDK 10.
There are issue with the mouse move events when HIDPI scale is set to some non-integer value like 1.25, 1.5, 2.5.
The issue is due to precision error. In native side in the awt_Win32GraphicsDevice class, ScaleUp and ScaleDown functions are used to get scaled value where ceil is used. But in java side, ClipRound is used which rounds the value instead of ceil. I think we should be doing round in native side also. This fixes the issue.
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