Integrated: 8324941: POC for Headless platform for JavaFX

[Johan Vos]

On Thu, 19 Jun 2025 08:33:52 GMT, Johan Vos <jvos at openjdk.org> wrote:

> After spending a year in the sandbox repository, the Headless Platform is now ready to be reviewed in the main repository.
> 
> ### the Headless Platform
> The Headless Platform is a top-level com.sun.glass.ui platform that replaces the second-level Monocle-Headless subplatform, that is part of the top-level Monocle platform. 
> The platform can be used like any other platform, especially for running headless JavaFX applications, or for running tests (e.g. on CI systems)
> 
> ### changes
> The code for the Headless Platform is in a new package com.sun.glass.ui.headless in the javafx.graphics module, and it does not require a code change in other packages.
> This PR adds a simple change in the `build.gradle` file, to make the Headless Platform the standard when running headless tests (instead of using Monocle/Headless)
> 
> ### enable the Headless Platform
> Setting the system property `glass.platform` to `Headless` will select the Headless Platform instead of the default one (either gtk, mac or win).
> 
> ### testing
> `gradlew --info -PHEADLESS_TEST=true -PFULL_TEST=true :systemTests:cleanTest :systemTests:test`
> runs all the system tests, apart from the robot tests. There are 2 failing tests, but there are valid reasons for those to fail.
> 
> ### robot tests
> Most of the robot tests are working on headless as well. add `-PUSE_ROBOT` to test those.

This pull request has now been integrated.

Changeset: 3c4d2905
Author:    Johan Vos <jvos at openjdk.org>
URL:       https://git.openjdk.org/jfx/commit/3c4d29057999af89f3264810cb48a2819fdecf8e
Stats:     1607 lines in 11 files changed: 1603 ins; 2 del; 2 mod

8324941: POC for Headless platform for JavaFX

Reviewed-by: kcr, angorya, jpereda

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PR: https://git.openjdk.org/jfx/pull/1836