[OpenJDK 2D-Dev] HiDPI support issues on Windows

Jim Graham james.graham at oracle.com
Tue Oct 4 20:28:52 UTC 2016

On 10/4/16 1:01 PM, Anton Tarasov wrote:
> Anyway, I roughly tried your approach mentioned in the previous e-mail, but forcing RM to paint via offscreen
> BufferedImage, not volatile (just for a quick check).
> It solved the shift issue of the demo listed in 8162350, which is cool. It also solved the traces of InternalFrame and
> menu in SwingSet2. Scrolling still traces (I suppose it should be resolved in JViewport/blitting).
> Also, the problem with primitives rendering (http://cr.openjdk.java.net/%7Eant/hidpi_pics/Scaling-150-percent.png) is
> still there. But it seems to relate to line-thikness (border-thickness) rounding inaccuracy. What we can do with that?...

Yes, blitting is a separate, but related case where pixel-exactness matters.  When we scroll a pane we need to scroll it 
by a precise number of pixels and then paint the newly visible information at a precise pixel location.  Solving this 
aspect might require events to have higher precision data available.

We should probably take detailed conversations about the solutions to the bug reports...


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