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Flutter Engine
The Flutter Engine
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Flutter Engine
The Flutter Engine
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#include <embedder.h>
Definition at line 2136 of file embedder.h.
| FlutterEngineAOTData FlutterProjectArgs::aot_data |
The AOT data to be used in AOT operation.
Embedders should instantiate and destroy this object via the FlutterEngineCreateAOTData and FlutterEngineCollectAOTData methods.
Embedders can provide either snapshot buffers or aot_data, but not both.
Definition at line 2351 of file embedder.h.
| const char* FlutterProjectArgs::assets_path |
The path to the Flutter assets directory containing project assets. The string can be collected after the call to FlutterEngineRun returns. The string must be NULL terminated.
Definition at line 2142 of file embedder.h.
| FlutterChannelUpdateCallback FlutterProjectArgs::channel_update_callback |
The callback invoked by the engine in response to a channel listener being registered on the framework side. The callback is invoked from a task posted to the platform thread.
Definition at line 2434 of file embedder.h.
| int FlutterProjectArgs::command_line_argc |
The command line argument count used to initialize the project.
Definition at line 2168 of file embedder.h.
| const char* const* FlutterProjectArgs::command_line_argv |
The command line arguments used to initialize the project. The strings can be collected after the call to FlutterEngineRun returns. The strings must be NULL terminated.
The set of engine flags are only meant to control unstable features in the engine. Deployed applications should not pass any command line arguments at all as they may affect engine stability at runtime in the presence of un-sanitized input. The list of currently recognized engine flags and their descriptions can be retrieved from the switches.h engine source file.
Definition at line 2184 of file embedder.h.
| const FlutterCompositor* FlutterProjectArgs::compositor |
Typically, Flutter renders the layer hierarchy into a single root surface. However, when embedders need to interleave their own contents within the Flutter layer hierarchy, their applications can push platform views within the Flutter scene. This is done using the SceneBuilder.addPlatformView call. When this happens, the Flutter rasterizer divides the effective view hierarchy into multiple layers. Each layer gets its own backing store and Flutter renders into the same. Once the layers contents have been fulfilled, the embedder is asked to composite these layers on-screen. At this point, it can interleave its own contents within the effective hierarchy. The interface for the specification of these layer backing stores and the hooks to listen for the composition of layers on-screen can be controlled using this field. This field is completely optional. In its absence, platforms views in the scene are ignored and Flutter renders to the root surface as normal.
Definition at line 2336 of file embedder.h.
| FlutterComputePlatformResolvedLocaleCallback FlutterProjectArgs::compute_platform_resolved_locale_callback |
A callback that computes the locale the platform would natively resolve to.
The input parameter is an array of FlutterLocales which represent the locales supported by the app. One of the input supported locales should be selected and returned to best match with the user/device's preferred locale. The implementation should produce a result that as closely matches what the platform would natively resolve to as possible.
Definition at line 2362 of file embedder.h.
| const char* FlutterProjectArgs::custom_dart_entrypoint |
The name of a custom Dart entrypoint. This is optional and specifying a null or empty entrypoint makes the engine look for a method named "main" in the root library of the application.
Care must be taken to ensure that the custom entrypoint is not tree-shaken away. Usually, this is done using the ‘@pragma('vm:entry-point’)` decoration.
Definition at line 2296 of file embedder.h.
| const FlutterCustomTaskRunners* FlutterProjectArgs::custom_task_runners |
Typically the Flutter engine create and manages its internal threads. This optional argument allows for the specification of task runner interfaces to event loops managed by the embedder on threads it creates.
Definition at line 2301 of file embedder.h.
| int FlutterProjectArgs::dart_entrypoint_argc |
The command line argument count for arguments passed through to the Dart entrypoint.
Definition at line 2366 of file embedder.h.
| const char* const* FlutterProjectArgs::dart_entrypoint_argv |
The command line arguments passed through to the Dart entrypoint. The strings must be NULL terminated.
The strings will be copied out and so any strings passed in here can be safely collected after initializing the engine with FlutterProjectArgs.
Definition at line 2374 of file embedder.h.
| int64_t FlutterProjectArgs::dart_old_gen_heap_size |
Max size of the old gen heap for the Dart VM in MB, or 0 for unlimited, -1 for default value.
Definition at line 2343 of file embedder.h.
| const char* FlutterProjectArgs::icu_data_path |
The path to the icudtl.dat file for the project. The string can be collected after the call to FlutterEngineRun returns. The string must be NULL terminated.
Definition at line 2166 of file embedder.h.
| bool FlutterProjectArgs::is_persistent_cache_read_only |
If true, the engine would only read the existing cache, but not write new ones.
Definition at line 2276 of file embedder.h.
| const uint8_t* FlutterProjectArgs::isolate_snapshot_data |
The isolate snapshot data buffer used in AOT operation. This buffer must be mapped in as read-only. For more information refer to the documentation on the Wiki at https://github.com/flutter/flutter/wiki/Flutter-engine-operation-in-AOT-Mode
Definition at line 2211 of file embedder.h.
| size_t FlutterProjectArgs::isolate_snapshot_data_size |
The size of the isolate snapshot data buffer. If isolate_snapshot_data is a symbol reference, 0 may be passed here.
Definition at line 2214 of file embedder.h.
| const uint8_t* FlutterProjectArgs::isolate_snapshot_instructions |
The isolate snapshot instructions buffer used in AOT operation. This buffer must be mapped in as read-execute. For more information refer to the documentation on the Wiki at https://github.com/flutter/flutter/wiki/Flutter-engine-operation-in-AOT-Mode
Definition at line 2219 of file embedder.h.
| size_t FlutterProjectArgs::isolate_snapshot_instructions_size |
The size of the isolate snapshot instructions buffer. If isolate_snapshot_instructions is a symbol reference, 0 may be passed here.
Definition at line 2222 of file embedder.h.
| FlutterLogMessageCallback FlutterProjectArgs::log_message_callback |
Definition at line 2382 of file embedder.h.
| const char* FlutterProjectArgs::log_tag |
Definition at line 2389 of file embedder.h.
| const char* FlutterProjectArgs::main_path__unused__ |
The path to the Dart file containing the main entry point. The string can be collected after the call to FlutterEngineRun returns. The string must be NULL terminated.
kernel_blob.bin in the assets directory. This struct member is retained for ABI stability. Definition at line 2152 of file embedder.h.
| OnPreEngineRestartCallback FlutterProjectArgs::on_pre_engine_restart_callback |
Definition at line 2399 of file embedder.h.
| const char* FlutterProjectArgs::packages_path__unused__ |
The path to the .packages file for the project. The string can be collected after the call to FlutterEngineRun returns. The string must be NULL terminated.
kernel_blob.bin in the assets directory. This struct member is retained for ABI stability. Definition at line 2162 of file embedder.h.
| const char* FlutterProjectArgs::persistent_cache_path |
Path to a directory used to store data that is cached across runs of a Flutter application (such as compiled shader programs used by Skia). This is optional. The string must be NULL terminated.
Definition at line 2272 of file embedder.h.
| FlutterPlatformMessageCallback FlutterProjectArgs::platform_message_callback |
The callback invoked by the engine in order to give the embedder the chance to respond to platform messages from the Dart application. The callback will be invoked on the thread on which the FlutterEngineRun call is made. The second parameter, user_data, is supplied when FlutterEngineRun or FlutterEngineInitialize is called.
Definition at line 2190 of file embedder.h.
| VoidCallback FlutterProjectArgs::root_isolate_create_callback |
The callback invoked by the engine in root isolate scope. Called immediately after the root isolate has been created and marked runnable.
Definition at line 2225 of file embedder.h.
| bool FlutterProjectArgs::shutdown_dart_vm_when_done |
All FlutterEngine instances in the process share the same Dart VM. When the first engine is launched, it starts the Dart VM as well. It used to be the case that it was not possible to shutdown the Dart VM cleanly and start it back up in the process in a safe manner. This issue has since been patched. Unfortunately, applications already began to make use of the fact that shutting down the Flutter engine instance left a running VM in the process. Since a Flutter engine could be launched on any thread, applications would "warm up" the VM on another thread by launching an engine with no isolates and then shutting it down immediately. The main Flutter application could then be started on the main thread without having to incur the Dart VM startup costs at that time. With the new behavior, this "optimization" immediately becomes massive performance pessimization as the VM would be started up in the "warm up" phase, shut down there and then started again on the main thread. Changing this behavior was deemed to be an unacceptable breaking change. Embedders that wish to shutdown the Dart VM when the last engine is terminated in the process should opt into this behavior by setting this flag to true.
Definition at line 2320 of file embedder.h.
| size_t FlutterProjectArgs::struct_size |
The size of this struct. Must be sizeof(FlutterProjectArgs).
Definition at line 2138 of file embedder.h.
| FlutterUpdateSemanticsCallback FlutterProjectArgs::update_semantics_callback |
The callback invoked by the engine in order to give the embedder the chance to respond to updates to semantics nodes and custom actions from the Dart application.
The callback will be invoked on the thread on which the FlutterEngineRun call is made.
update_semantics_callback2 instead. Only one of update_semantics_node_callback, update_semantics_callback, and update_semantics_callback2 may be provided; the others must be set to null.This callback is incompatible with multiple views. If this callback is provided, FlutterEngineAddView and FlutterEngineRemoveView should not be used.
Definition at line 2417 of file embedder.h.
| FlutterUpdateSemanticsCallback2 FlutterProjectArgs::update_semantics_callback2 |
The callback invoked by the engine in order to give the embedder the chance to respond to updates to semantics nodes and custom actions from the Dart application.
The callback will be invoked on the thread on which the FlutterEngineRun call is made.
Only one of update_semantics_node_callback, update_semantics_callback, and update_semantics_callback2 may be provided; the others must be set to null.
Definition at line 2429 of file embedder.h.
| FlutterUpdateSemanticsCustomActionCallback FlutterProjectArgs::update_semantics_custom_action_callback |
The legacy callback invoked by the engine in order to give the embedder the chance to respond to updates to semantics custom actions from the Dart application. Custom action updates are sent in batches terminated by a 'batch end' callback that is passed a sentinel FlutterSemanticsCustomAction whose id field has the value kFlutterSemanticsCustomActionIdBatchEnd.
The callback will be invoked on the thread on which the FlutterEngineRun call is made.
update_semantics_callback2 instead. Only one of update_semantics_node_callback, update_semantics_callback, and update_semantics_callback2 may be provided; the others should be set to null.This callback is incompatible with multiple views. If this callback is provided, FlutterEngineAddView and FlutterEngineRemoveView should not be used.
Definition at line 2265 of file embedder.h.
| FlutterUpdateSemanticsNodeCallback FlutterProjectArgs::update_semantics_node_callback |
The legacy callback invoked by the engine in order to give the embedder the chance to respond to semantics node updates from the Dart application. Semantics node updates are sent in batches terminated by a 'batch end' callback that is passed a sentinel FlutterSemanticsNode whose id field has the value kFlutterSemanticsNodeIdBatchEnd.
The callback will be invoked on the thread on which the FlutterEngineRun call is made.
update_semantics_callback2 instead. Only one of update_semantics_node_callback, update_semantics_callback, and update_semantics_callback2 may be provided; the others should be set to null.This callback is incompatible with multiple views. If this callback is provided, FlutterEngineAddView and FlutterEngineRemoveView should not be used.
Definition at line 2244 of file embedder.h.
| const uint8_t* FlutterProjectArgs::vm_snapshot_data |
The VM snapshot data buffer used in AOT operation. This buffer must be mapped in as read-only. For more information refer to the documentation on the Wiki at https://github.com/flutter/flutter/wiki/Flutter-engine-operation-in-AOT-Mode
Definition at line 2195 of file embedder.h.
| size_t FlutterProjectArgs::vm_snapshot_data_size |
The size of the VM snapshot data buffer. If vm_snapshot_data is a symbol reference, 0 may be passed here.
Definition at line 2198 of file embedder.h.
| const uint8_t* FlutterProjectArgs::vm_snapshot_instructions |
The VM snapshot instructions buffer used in AOT operation. This buffer must be mapped in as read-execute. For more information refer to the documentation on the Wiki at https://github.com/flutter/flutter/wiki/Flutter-engine-operation-in-AOT-Mode
Definition at line 2203 of file embedder.h.
| size_t FlutterProjectArgs::vm_snapshot_instructions_size |
The size of the VM snapshot instructions buffer. If vm_snapshot_instructions is a symbol reference, 0 may be passed here.
Definition at line 2206 of file embedder.h.
| VsyncCallback FlutterProjectArgs::vsync_callback |
A callback that gets invoked by the engine when it attempts to wait for a platform vsync event. The engine will give the platform a baton that needs to be returned back to the engine via FlutterEngineOnVsync. All batons must be retured to the engine before initializing a FlutterEngineShutdown. Not doing the same will result in a memory leak. While the call to FlutterEngineOnVsync must occur on the thread that made the call to FlutterEngineRun, the engine will make this callback on an internal engine-managed thread. If the components accessed on the embedder are not thread safe, the appropriate re-threading must be done.
Definition at line 2287 of file embedder.h.
1.9.8