mirror of
https://github.com/JakubMelka/PDF4QT.git
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73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
// MIT License
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//
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// Copyright (c) 2018-2025 Jakub Melka and Contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include "pdfprogress.h"
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#include "pdfdbgheap.h"
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namespace pdf
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{
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PDFProgress::PDFProgress(QObject* parent) :
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QObject(parent)
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{
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qRegisterMetaType<pdf::ProgressStartupInfo>();
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}
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void PDFProgress::start(size_t stepCount, ProgressStartupInfo startupInfo)
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{
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Q_ASSERT(stepCount > 0);
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m_currentStep = 0;
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m_stepCount = stepCount;
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m_percentage = 0;
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Q_EMIT progressStarted(qMove(startupInfo));
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}
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void PDFProgress::step()
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{
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// Atomically increment by one. We must add + 1 to the current step,
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// because fetch_add will return old value. Then we must test, if percentage
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// has been changed.
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size_t currentStep = m_currentStep.fetch_add(1) + 1;
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int newPercentage = int((size_t(100) * currentStep) / m_stepCount);
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int oldPercentage = m_percentage.load(std::memory_order_acquire);
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bool emitSignal = oldPercentage < newPercentage;
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do
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{
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emitSignal = oldPercentage < newPercentage;
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} while (oldPercentage < newPercentage && !m_percentage.compare_exchange_weak(oldPercentage, newPercentage, std::memory_order_release, std::memory_order_relaxed));
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if (emitSignal)
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{
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Q_EMIT progressStep(newPercentage);
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}
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}
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void PDFProgress::finish()
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{
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Q_EMIT progressFinished();
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}
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} // namespace pdf
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