| commit | f638348b22e96e208badb71de52a860d201ee2fb | [log] [tgz] |
|---|---|---|
| author | Drew Davenport <ddavenport@google.com> | Fri Feb 21 10:05:39 2025 -0700 |
| committer | Drew Davenport <ddavenport@google.com> | Fri Mar 14 11:38:40 2025 -0600 |
| tree | fbadd16cc9ed4d2d4aa38453dca33e6fcf88aefd | |
| parent | 609c353553bb3f172d21394b8bf62b3bace09579 [diff] |
drm_hwcomposer: Support DisplayCommand.expectedPresentTime DisplayCommand.expectedPresentTime indicates that the HWC should present the composition as close to the desired time as possible. It may be that the desired time is some number of vsync periods in the future. A drm atomic commit will always present at the next vsync, and there is no mechanism for userspace to indicate a desired present time. Lacking a kernel uAPI to support this, an alternative is to sleep in userspace until the next expected vsync aligns with the expected present time. Change-Id: Iad703eed9b0e459194f895339dd604990875f157 Signed-off-by: Drew Davenport <ddavenport@google.com>
Patches to drm_hwcomposer are very much welcome, we really want this to be the universal HW composer implementation for Android and similar platforms. So please bring on porting patches, bugfixes, improvements for documentation and new features.
A short list of contribution guidelines:
Submit changes via gitlab merge requests on gitlab.freedesktop.org.
drm_hwcomposer is Apache 2.0 Licensed and we require contributions to follow the developer's certificate of origin: http://developercertificate.org/.
When submitting new code please follow the naming conventions documented in the generated documentation. Also please make full use of all the helpers and convenience macros provided by drm_hwcomposer. The below command can help you with formatting of your patches:
git diff | clang-format-diff-19 -p 1 -style=file
Hardware specific changes should be tested on relevant platforms before committing.
If you need inspiration, please checkout our TODO issues.
Happy hacking!