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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_COMPOSITING_WIDGET_SWAP_QUEUE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_COMPOSITING_WIDGET_SWAP_QUEUE_H_
#include <map>
#include "base/synchronization/lock.h"
#include "third_party/blink/public/mojom/widget/platform_widget.mojom-blink.h"
#include "third_party/blink/renderer/platform/allow_discouraged_type.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
// Queue used to keep track of which VisualStateRequestCallback should be
// invoked after a particular compositor frame swap. The callbacks are
// guaranteed to be processed after the frame is processed, but there is no
// guarantee that nothing else happens between processing the frame and
// processing the callback.
class WidgetSwapQueue {
public:
using VisualStateRequestCallback =
mojom::blink::WidgetCompositor::VisualStateRequestCallback;
WidgetSwapQueue() = default;
~WidgetSwapQueue() = default;
WidgetSwapQueue(const WidgetSwapQueue&) = delete;
WidgetSwapQueue& operator=(const WidgetSwapQueue&) = delete;
// Returns true if there are no callback in the queue.
bool Empty() const { return queue_.empty(); }
// Queues the callback to be returned on a matching Drain call.
//
// |source_frame_number| - frame number to queue |callback| for.
// |callback| - callback to queue. The method takes ownership of |callback|.
// |is_first| - output parameter. Set to true if this was the first message
// enqueued for the given source_frame_number.
void Queue(int source_frame_number,
VisualStateRequestCallback callback,
bool* is_first);
// The method will append cllbacks queued for frame numbers lower or equal to
// |source_frame_number|
//
// |source_frame_number| - swapped frame number.
void Drain(int source_frame_number);
// The method will clear |next_callbacks_| after copying to |callbacks|.
//
// |callbacks| - vector to store callbacks.
void GetCallbacks(Vector<VisualStateRequestCallback>* callbacks);
private:
base::Lock lock_;
std::map<int, Vector<VisualStateRequestCallback>> queue_
ALLOW_DISCOURAGED_TYPE("TODO(crbug.com/1404327)");
Vector<VisualStateRequestCallback> next_callbacks_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_COMPOSITING_WIDGET_SWAP_QUEUE_H_
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