RFR: JDK-8365426 : [macos26] Graphics2D tests fail on new macOS 26

[Harshitha Onkar]

On Thu, 13 Nov 2025 23:20:18 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

> This test started to fail on macOS26 due to color inconsistency at certain points.
> Color tolerance has been added as a fix.
> 
> The color tolerance for the dominant component (eg Color.RED - dominant component is red) is set less (delta of PRIMARY_TOLERANCE = 2) and for non-dominant (For Color.RED - Green and Blue are non-dominant) is set more (delta of TOLERANCE=30). This ensures we are checking for shades (brighter/lighter) of the expected color.
> 
> Since the issue is only seen on macOS, I have set both PRIMARY_TOLERANCE & TOLERANCE to 2 on other platforms to keep the test almost close to the original one.
>  
> Tested locally on macOS 26.0.1 and 26.1 and fix works as expected.
> 
> CI testing on other platforms looks good and no regressions are observed (Link added to JBS).

test/jdk/java/awt/Graphics2D/CopyAreaOOB.java line 73:

> 71:         try {
> 72:             if (!Platform.isOSX()) {
> 73:                 TOLERANCE = PRIMARY_TOLERANCE;

I could set tolerance and primary_tolerance both to zero on other platforms although I have currently set it to a small delta of 2. I can change it to zero if any reviewers suggest that exact color compare would be better.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28312#discussion_r2525241621