RFR: 8318577: Windows Look-and-Feel JProgressBarUI does not render correctly on 2x UI scale [v3]

Prasanta Sadhukhan psadhukhan at openjdk.org
Fri Jan 24 12:24:02 UTC 2025


> JProgressBar (StringPainted variant) does not render consistently on HiDPI displays (e.g. 200% Scale Factor) on Windows (using Windows Look-and-Feel) depending on the height at which JProgressBar is rendered, in which case the gap between progressbar and skin is different for different height as can be seen below
> 
> ![image](https://github.com/user-attachments/assets/5552ba7d-f747-4037-9db0-e1554f8b35d9)
> 
> Native windows progressbar renders without leaving any gap as can be seen here
> 
> ![image](https://github.com/user-attachments/assets/672a5810-1c44-4c22-aef2-93abde536bca)
> 
> so the padding is removed to render the progressbar similar to windows native and it is rendered properly
> 
> ![image](https://github.com/user-attachments/assets/ecb25140-8df2-47e2-bde5-925eb031bedb)

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  hidpi support for line stroke width/height

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23227/files
  - new: https://git.openjdk.org/jdk/pull/23227/files/abb28511..6ec1d16b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23227&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23227&range=01-02

  Stats: 14 lines in 1 file changed: 9 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23227.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23227/head:pull/23227

PR: https://git.openjdk.org/jdk/pull/23227


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