mirror of
https://gitlab.freedesktop.org/emersion/libdisplay-info.git
synced 2024-12-26 21:59:15 +01:00
147d6611a6
Since eed3e1e0f8 ("test: remove edid-decode as a test
dependency"), edid-decode is no longer required to run the test
suite. It's only required to re-generate the test data.
Expand a bit on how to setup edid-decode to re-generate the test
data.
Signed-off-by: Simon Ser <contact@emersion.fr>
81 lines
3.1 KiB
Markdown
81 lines
3.1 KiB
Markdown
# libdisplay-info
|
|
|
|
EDID and DisplayID library.
|
|
|
|
Goals:
|
|
|
|
- Provide a set of high-level, easy-to-use, opinionated functions as well as
|
|
low-level functions to access detailed information.
|
|
- Simplicity and correctness over performance and resource usage.
|
|
- Well-tested and fuzzed.
|
|
|
|
Documentation is available on the [website].
|
|
|
|
## Using
|
|
|
|
The public API headers are categorised as either high-level or low-level API
|
|
as per the comments in the header files. Users of libdisplay-info should prefer
|
|
high-level API over low-level API when possible.
|
|
|
|
If high-level API lacks needed features, please propose additions to the
|
|
high-level API upstream before using low-level API to get what you need.
|
|
If the additions are rejected, you are welcome to use the low-level API.
|
|
|
|
This policy is aimed to propagate best practises when interpreting EDID
|
|
and DisplayID information which can often be cryptic or even inconsistent.
|
|
|
|
libdisplay-info uses [semantic versioning]. The public API is not yet stable.
|
|
|
|
## Contributing
|
|
|
|
Open issues and merge requests on the [GitLab project]. Discuss and ask
|
|
questions in the [#wayland] IRC channel on OFTC.
|
|
|
|
In general, the [Wayland contribution guidelines] should be followed. In
|
|
particular, each commit must carry a Signed-off-by tag to denote that the
|
|
submitter adheres to the [Developer Certificate of Origin 1.1]. This project
|
|
follows the [freedesktop.org Contributor Covenant].
|
|
|
|
## Building
|
|
|
|
libdisplay-info has the following dependencies:
|
|
|
|
- [hwdata] for the PNP ID database used at build-time only.
|
|
|
|
libdisplay-info is built using [Meson]:
|
|
|
|
meson setup build/
|
|
ninja -C build/
|
|
|
|
## Testing
|
|
|
|
The low-level EDID library is tested against [edid-decode]. `test/data/`
|
|
contains a small collection of EDID blobs and diffs between upstream
|
|
`edid-decode` and our `di-edid-decode` clone. Our CI ensures the diffs are
|
|
up-to-date. A patch should never make the diffs grow larger. To re-generate the
|
|
test data, build `edid-decode` at the Git revision mentioned in
|
|
`.gitlab-ci.yml`, put the executable in `PATH`, and run
|
|
`ninja -C build/ gen-test-data`.
|
|
|
|
The latest code coverage report is available on [GitLab CI][coverage].
|
|
|
|
## Fuzzing
|
|
|
|
To fuzz libdisplay-info with [AFL], the library needs to be instrumented:
|
|
|
|
CC=afl-gcc meson build/
|
|
ninja -C build/
|
|
afl-fuzz -i test/data/ -o afl/ build/di-edid-decode/di-edid-decode
|
|
|
|
[website]: https://emersion.pages.freedesktop.org/libdisplay-info/
|
|
[semantic versioning]: https://semver.org/
|
|
[GitLab project]: https://gitlab.freedesktop.org/emersion/libdisplay-info
|
|
[#wayland]: ircs://irc.oftc.net/#wayland
|
|
[Wayland contribution guidelines]: https://gitlab.freedesktop.org/wayland/wayland/-/blob/main/CONTRIBUTING.md
|
|
[Developer Certificate of Origin 1.1]: https://developercertificate.org/
|
|
[freedesktop.org Contributor Covenant]: https://www.freedesktop.org/wiki/CodeOfConduct/
|
|
[hwdata]: https://github.com/vcrhonek/hwdata
|
|
[Meson]: https://mesonbuild.com/
|
|
[coverage]: https://gitlab.freedesktop.org/emersion/libdisplay-info/-/jobs/artifacts/main/file/build/meson-logs/coveragereport/index.html?job=build-gcc
|
|
[edid-decode]: https://git.linuxtv.org/edid-decode.git/
|
|
[AFL]: https://lcamtuf.coredump.cx/afl/
|