Ubuntu 26.10 may send multiple stream format events, and our screen capture code doesn't handle it correctly:
`onStreamParamChanged()` calls blocking `pw_thread_loop_signal(..., TRUE)` and expects the corresponding `pw_thread_loop_accept` call. However, `pw_thread_loop_accept` is only called while waiting for the initial format, so a subsequent event can block PipeWire thread indefinitely. --- So the minimal fix would be to replace it with a non-blocking `pw_thread_loop_signal(..., FALSE)` call and remove the corresponding accept call(with some other minor changes). However, this alone leaves several other issues to address: - The `isAllDataReady` check and the wait now run under the same lock, preventing lost wakeups. - Added a 10s shared timeout for format negotiation and frame capture, so missing events don't block java indefinitely. - After capturing a frame, `onStreamProcess()` now returns any additional buffers to PipeWire so they can be reused while the stream is still active, e.g., while waiting for frames from other screens. - Requeuing a PipeWire buffer allows its pixel data to be reused before we copy it to the Java array. The `captureDataPixbuf` now always owns pixel data. - `NULL` checks were added for pixbuf creation and scaling. - Capture cleanup and stream deactivation now run under the same PipeWire loop lock, preventing callbacks from observing partially reset capture state. - Other cleanup improvements (pw context destruction, captureDataPixbuf unref) - A valid restore token can be rejected incorrectly for uiScale other than 1 for non standard resolutions(e.g. rounding for height on VirtualBox screen `1359` > `680` > `1360` with uiScale 2). Now it uses native screen bounds directly. Testing looks good. --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - native screen bounds - destroy pipewire context - release captureDataPixbuf - capture cleanup locking - requeuing buffers - pixbuf error handling - owned capture pixels - capture timeout - stream connection locking - minimal hang fix Changes: https://git.openjdk.org/jdk/pull/33384/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=33384&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8393416 Stats: 142 lines in 3 files changed: 76 ins; 31 del; 35 mod Patch: https://git.openjdk.org/jdk/pull/33384.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/33384/head:pull/33384 PR: https://git.openjdk.org/jdk/pull/33384
