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89 lines
2.4 KiB
C++
89 lines
2.4 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_FLOW_SKIA_GPU_OBJECT_H_
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#define FLUTTER_FLOW_SKIA_GPU_OBJECT_H_
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#include <mutex>
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#include <queue>
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#include "flutter/fml/memory/ref_counted.h"
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#include "flutter/fml/memory/weak_ptr.h"
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#include "flutter/fml/task_runner.h"
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#include "third_party/skia/include/core/SkRefCnt.h"
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namespace flow {
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// A queue that holds Skia objects that must be destructed on the the given task
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// runner.
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class SkiaUnrefQueue : public fml::RefCountedThreadSafe<SkiaUnrefQueue> {
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public:
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void Unref(SkRefCnt* object);
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// Usually, the drain is called automatically. However, during IO manager
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// shutdown (when the platform side reference to the OpenGL context is about
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// to go away), we may need to pre-emptively drain the unref queue. It is the
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// responsibility of the caller to ensure that no further unrefs are queued
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// after this call.
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void Drain();
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private:
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const fml::RefPtr<fml::TaskRunner> task_runner_;
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const fml::TimeDelta drain_delay_;
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std::mutex mutex_;
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std::deque<SkRefCnt*> objects_;
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bool drain_pending_;
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SkiaUnrefQueue(fml::RefPtr<fml::TaskRunner> task_runner,
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fml::TimeDelta delay);
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~SkiaUnrefQueue();
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FML_FRIEND_REF_COUNTED_THREAD_SAFE(SkiaUnrefQueue);
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FML_FRIEND_MAKE_REF_COUNTED(SkiaUnrefQueue);
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FML_DISALLOW_COPY_AND_ASSIGN(SkiaUnrefQueue);
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};
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/// An object whose deallocation needs to be performed on an specific unref
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/// queue. The template argument U need to have a call operator that returns
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/// that unref queue.
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template <class T>
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class SkiaGPUObject {
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public:
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using SkiaObjectType = T;
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SkiaGPUObject() = default;
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SkiaGPUObject(sk_sp<SkiaObjectType> object, fml::RefPtr<SkiaUnrefQueue> queue)
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: object_(std::move(object)), queue_(std::move(queue)) {
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FML_DCHECK(queue_ && object_);
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}
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SkiaGPUObject(SkiaGPUObject&&) = default;
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~SkiaGPUObject() { reset(); }
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SkiaGPUObject& operator=(SkiaGPUObject&&) = default;
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sk_sp<SkiaObjectType> get() const { return object_; }
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void reset() {
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if (object_) {
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queue_->Unref(object_.release());
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}
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queue_ = nullptr;
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FML_DCHECK(object_ == nullptr);
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}
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private:
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sk_sp<SkiaObjectType> object_;
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fml::RefPtr<SkiaUnrefQueue> queue_;
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FML_DISALLOW_COPY_AND_ASSIGN(SkiaGPUObject);
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};
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} // namespace flow
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#endif // FLUTTER_FLOW_SKIA_GPU_OBJECT_H_
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