flutter::VsyncWaiterAndroid Class Reference

#include <vsync_waiter_android.h>

Inheritance diagram for flutter::VsyncWaiterAndroid:

Public Member Functions
	VsyncWaiterAndroid (const flutter::TaskRunners &task_runners)
	~VsyncWaiterAndroid () override
Public Member Functions inherited from flutter::VsyncWaiter
virtual	~VsyncWaiter ()
void	AsyncWaitForVsync (const Callback &callback)
void	ScheduleSecondaryCallback (uintptr_t id, const fml::closure &callback)

Static Public Member Functions
static bool	Register (JNIEnv *env)

Private Member Functions
void	AwaitVSync () override

Additional Inherited Members
Public Types inherited from flutter::VsyncWaiter
using	Callback = std::function< void(std::unique_ptr< FrameTimingsRecorder >)>
Protected Member Functions inherited from flutter::VsyncWaiter
	VsyncWaiter (const TaskRunners &task_runners)
virtual void	AwaitVSyncForSecondaryCallback ()
void	FireCallback (fml::TimePoint frame_start_time, fml::TimePoint frame_target_time, bool pause_secondary_tasks=true)
Protected Attributes inherited from flutter::VsyncWaiter
const TaskRunners	task_runners_

Detailed Description

Definition at line 19 of file vsync_waiter_android.h.

Constructor & Destructor Documentation

VsyncWaiterAndroid()

flutter::VsyncWaiterAndroid::VsyncWaiterAndroid ( const flutter::TaskRunners &  task_runners )

explicit

Definition at line 24 of file vsync_waiter_android.cc.

    : VsyncWaiter(task_runners) {}

~VsyncWaiterAndroid()

flutter::VsyncWaiterAndroid::~VsyncWaiterAndroid ( )

overridedefault

Member Function Documentation

AwaitVSync()

void flutter::VsyncWaiterAndroid::AwaitVSync ( )

overrideprivatevirtual

Implements flutter::VsyncWaiter.

Definition at line 30 of file vsync_waiter_android.cc.

                                    {
  if (impeller::android::Choreographer::IsAvailableOnPlatform()) {
    auto* weak_this = new std::weak_ptr<VsyncWaiter>(shared_from_this());
    fml::TaskRunner::RunNowOrPostTask(
        task_runners_.GetUITaskRunner(), [weak_this]() {
          const auto& choreographer =
              impeller::android::Choreographer::GetInstance();
          choreographer.PostFrameCallback([weak_this](auto time) {
            auto time_ns =
                std::chrono::time_point_cast<std::chrono::nanoseconds>(time)
                    .time_since_epoch()
                    .count();
            OnVsyncFromNDK(time_ns, weak_this);
          });
        });
  } else {
    // TODO(99798): Remove it when we drop support for API level < 29 and 32-bit
    // devices.
    auto* weak_this = new std::weak_ptr<VsyncWaiter>(shared_from_this());
    jlong java_baton = reinterpret_cast<jlong>(weak_this);
    task_runners_.GetPlatformTaskRunner()->PostTask([java_baton]() {
      JNIEnv* env = fml::jni::AttachCurrentThread();
      env->CallStaticVoidMethod(g_vsync_waiter_class->obj(),     //
                                g_async_wait_for_vsync_method_,  //
                                java_baton                       //
      );
    });
  }
}

Register()

bool flutter::VsyncWaiterAndroid::Register ( JNIEnv *  env )

static

Definition at line 122 of file vsync_waiter_android.cc.

                                             {
  static const JNINativeMethod methods[] = {
      {
          .name = "nativeOnVsync",
          .signature = "(JJJ)V",
          .fnPtr = reinterpret_cast<void*>(&OnVsyncFromJava),
      },
      {
          .name = "nativeUpdateRefreshRate",
          .signature = "(F)V",
          .fnPtr = reinterpret_cast<void*>(&OnUpdateRefreshRate),
      }};
 
  jclass clazz = env->FindClass("io/flutter/embedding/engine/FlutterJNI");
 
  if (clazz == nullptr) {
    return false;
  }
 
  g_vsync_waiter_class = new fml::jni::ScopedJavaGlobalRef<jclass>(env, clazz);
  FML_CHECK(!g_vsync_waiter_class->is_null());
 
  g_async_wait_for_vsync_method_ = env->GetStaticMethodID(
      g_vsync_waiter_class->obj(), "asyncWaitForVsync", "(J)V");
  FML_CHECK(g_async_wait_for_vsync_method_ != nullptr);
 
  return env->RegisterNatives(clazz, methods, fml::size(methods)) == 0;
}

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The documentation for this class was generated from the following files:

• shell/platform/android/vsync_waiter_android.h
• shell/platform/android/vsync_waiter_android.cc