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/*
* Copyright (C) 2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(IMAGE_ANALYSIS)
#include <wtf/FastMalloc.h>
#include <wtf/PriorityQueue.h>
#include <wtf/WeakHashSet.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class Document;
class HTMLImageElement;
class Page;
class Timer;
class ImageAnalysisQueue {
WTF_MAKE_FAST_ALLOCATED;
public:
ImageAnalysisQueue(Page&);
~ImageAnalysisQueue();
WEBCORE_EXPORT void enqueueAllImages(Document&, const String& identifier);
void clear();
void enqueueIfNeeded(HTMLImageElement&);
private:
void resumeProcessingSoon();
void resumeProcessing();
enum class Priority : bool { Low, High };
struct Task {
WeakPtr<HTMLImageElement> element;
Priority priority { Priority::Low };
unsigned taskNumber { 0 };
};
static bool firstIsHigherPriority(const Task&, const Task&);
unsigned nextTaskNumber() { return ++m_currentTaskNumber; }
String m_identifier;
WeakPtr<Page> m_page;
Timer m_resumeProcessingTimer;
WeakHashSet<HTMLImageElement> m_queuedElements;
PriorityQueue<Task, firstIsHigherPriority> m_queue;
unsigned m_pendingRequestCount { 0 };
unsigned m_currentTaskNumber { 0 };
};
inline bool ImageAnalysisQueue::firstIsHigherPriority(const Task& first, const Task& second)
{
if (first.priority != second.priority)
return first.priority == Priority::High;
return first.taskNumber < second.taskNumber;
}
} // namespace WebCore
#endif // ENABLE(IMAGE_ANALYSIS)
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