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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/fml/closure.h"
#include "flutter/fml/macros.h"
#include "third_party/skia/include/core/SkExecutor.h"
namespace flutter {
/// @brief An interface used by Skia to schedule work on engine managed
/// threads (usually workers in a concurrent message loop).
/// Skia may decide that certain workloads don't have thread
/// affinity and may be performed on a background thread. However,
/// Skia does not manage its own threads. So, it delegates the
/// scheduling of this work to the engine via this interface. The
/// engine has a dedicated pool of threads it uses for scheduling
/// background tasks that have no thread affinity. This thread
/// worker pool is held next to the process global Dart VM instance.
/// The Skia executor is wired up there as well.
class SkiaConcurrentExecutor : public SkExecutor {
/// The callback invoked by the executor to schedule the given task onto an
/// engine managed background thread.
using OnWorkCallback = std::function<void(fml::closure work)>;
/// @brief Create a new instance of the executor.
/// @param[in] on_work The work callback.
SkiaConcurrentExecutor(const OnWorkCallback& on_work);
// |SkExecutor|
~SkiaConcurrentExecutor() override;
// |SkExecutor|
void add(fml::closure work) override;
OnWorkCallback on_work_;
} // namespace flutter