| commit | 5aff0f4f0f458eb01ac0c8a759aeb38766041d12 | [log] [tgz] |
|---|---|---|
| author | Jim Graham <flar@google.com> | Wed Sep 11 18:20:59 2024 -0700 |
| committer | dart-internal-monorepo <dart-internal-monorepo@dart-ci-internal.iam.gserviceaccount.com> | Wed Sep 11 18:27:47 2024 -0700 |
| tree | 9fb82d9de03a7fb0ff38be994ef59b7d75d6b95b | |
| parent | f8fbe84fd45bbe33d828feb13fa54befd0cda939 [diff] |
[DisplayList] DlPath object provides auto-conversion from Skia to Impeller (#55055) Switch from using the clumsy manual CacheablePath object to a more automatic DlPath object for holding paths in DisplayLists and dispatching them to either Skia or Impeller with auto-conversion. For now DlPath is just a wrapper around SkPath with an auto-generating Impeller Path object which is very similar in design from what was done with the CacheablePath object except that it manages the caching of the Impeller path internally without extra burden on Impeller or Skia. There is also no need to communicate with the Dispatch method as to which type of path you prefer, they're all "auto-converting" DlPath objects now. For now, ui.Path still generates an SkPath and so we wrap it when we record it into a DisplayList, just like the former CacheablePath mechanism. It will be a simple conversion to create the DlPath wrapper in ui.Path, though, so as to maintain the cached Impeller paths across frames even if the DisplayList itself is not preserved. Eventually DlPath will take on more of a role of hiding the construction and internal representation of the paths so that we could be using SkPath, impeller::Path, or some other internal storage. For now, SkPath will likely remain primary storage for a while so that we can deal with PathOps. https://dart.googlesource.com/external/github.com/flutter/engine/+/d9f466f5eaeeb4688f046cf46dd230574baf0840
Monorepo is:
With depot_tools installed and on your path, create a directory for your monorepo checkout and run these commands to create a gclient solution in that directory:
mkdir monorepo cd monorepo gclient config --unmanaged https://dart.googlesource.com/monorepo gclient sync -D
This gives you a checkout in the monorepo directory that contains:
monorepo/ DEPS - the DEPS used for this gclient checkout commits.json - the pinned commits for Dart, flutter/engine, and flutter/flutter tools/ - scripts used to create monorepo DEPS engine/src/ - the flutter/buildroot repo flutter/ - the flutter/engine repo out/ - the build directory, where Flutter engine builds are created third_party/ - Flutter dependencies checked out by DEPS dart/ - the Dart SDK checkout. third_party - Dart dependencies, also used by Flutter flutter/ - the flutter/flutter repo
Flutter's instructions for building the engine are at Compiling the engine
They can be followed closely, with a few changes:
goma_ctl ensure_start is sufficient.Example build commands that work on linux:
MONOREPO_PATH=$PWD if [[ ! $PATH =~ (^|:)$MONOREPO_PATH/flutter/bin(:|$) ]]; then PATH=$MONOREPO_PATH/flutter/bin:$PATH fi export GOMA_DIR=$(dirname $(command -v gclient))/.cipd_bin goma_ctl ensure_start pushd engine/src flutter/tools/gn --goma --no-prebuilt-dart-sdk --unoptimized --full-dart-sdk autoninja -C out/host_debug_unopt popd
The Flutter commands used to build and run apps will use the locally built Flutter engine and Dart SDK, instead of the one downloaded by the Flutter tool, if the --local-engine option is provided.
For example, to build and run the Flutter spinning square sample on the web platform,
MONOREPO_PATH=$PWD cd flutter/examples/layers flutter --local-engine=host_debug_unopt \ -d chrome run widgets/spinning_square.dart cd $MONOREPO_PATH
To build for desktop, specify the desktop platform device in flutter run as -d macos or -d linux or -d windows. You may also need to run the command
flutter create --platforms=windows,macos,linux
on existing apps, such as sample apps. New apps created with flutter create already include these support files. Details of desktop support are at Desktop Support for Flutter
Tests in the Flutter source tree can be run with the flutter test command, run in the directory of a package containing tests. For example:
MONOREPO_PATH=$PWD cd flutter/packages/flutter flutter test --local-engine=host_debug_unopt cd $MONOREPO_PATH
Please file an issue or email the dart-engprod team with any problems with or questions about using monorepo.
We will update this documentation to address them.
flutter commands may download the engine and Dart SDK files for the configured channel, even though they will be using the local engine and its SDK.gclient sync needs to be run in an administrator session, because some installed dependencies create symlinks.