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