Implement WindowUnderPoint() for Mac OSX and Windows

WindowUnderPoint() is a platform independent function to return the id of the
first window in z-order under a certain DesktopVector. It equals to
GetAncestor(WindowFromPoint(point), GA_ROOT)
on Windows.

This CL includes the change to Windows / Mac OSX only to control the size in a
reasonable range. Implementation for Linux will be added in a coming change.

Bug: webrtc:7950
Change-Id: I57e423294fc8aeaa12d05cb626a1912240b2d4d0
Reviewed-on: https://chromium-review.googlesource.com/595022
Commit-Queue: Zijie He <zijiehe@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#19263}
11 files changed
tree: ec67d563d2f77e03e6ad2daafa7b5381ba06775d
  1. build_overrides/
  2. data/
  3. infra/
  4. resources/
  5. tools_webrtc/
  6. webrtc/
  7. .clang-format
  8. .git-blame-ignore-revs
  9. .gitignore
  10. .gn
  11. AUTHORS
  12. BUILD.gn
  13. check_root_dir.py
  14. cleanup_links.py
  15. CODE_OF_CONDUCT.md
  16. codereview.settings
  17. DEPS
  18. LICENSE
  19. license_template.txt
  20. LICENSE_THIRD_PARTY
  21. OWNERS
  22. PATENTS
  23. PRESUBMIT.py
  24. pylintrc
  25. README.md
  26. WATCHLISTS
README.md

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.

The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others.

Development

See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.

More info