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123 lines
3.5 KiB
123 lines
3.5 KiB
/*****************************************************************************
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* Copyright (C) 2021 the VideoLAN team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include <QImage>
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#include <QColor>
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#include "imageluminanceextractor.hpp"
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ImageLuminanceExtractor::ImageLuminanceExtractor(QObject *parent) : QObject(parent) {}
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QUrl ImageLuminanceExtractor::source() const
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{
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return m_source;
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}
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int ImageLuminanceExtractor::luminance() const
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{
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return m_luminance;
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}
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bool ImageLuminanceExtractor::isEnabled() const
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{
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return m_enabled;
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}
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void ImageLuminanceExtractor::setLuminance(const int luminance)
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{
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m_luminance = luminance;
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emit luminanceChanged(m_luminance);
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}
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void ImageLuminanceExtractor::setSource(const QUrl &source)
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{
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if (m_source == source)
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return;
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m_source = source;
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if (m_enabled)
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startTask();
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else
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m_pendingUpdate = true;
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emit sourceChanged(m_source);
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}
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void ImageLuminanceExtractor::setIsEnabled(const bool enabled)
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{
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if (m_enabled == enabled)
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return;
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m_enabled = enabled;
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if (m_enabled && m_pendingUpdate)
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startTask();
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emit enabledChanged(m_enabled);
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}
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void ImageLuminanceExtractor::startTask()
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{
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m_pendingUpdate = false;
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m_task.reset(new LuminanceCalculator(m_source));
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connect(m_task.get(), &LuminanceCalculator::result, this, [this]()
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{
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LuminanceCalculator *task = static_cast<LuminanceCalculator *>(sender());
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assert(task == m_task.get());
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int result = task->takeResult();
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if (result != Status::FAILED)
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setLuminance(result);
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else
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qWarning("luminance extraction failed");
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m_task.reset();
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});
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m_task->start(*QThreadPool::globalInstance());
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}
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ImageLuminanceExtractor::LuminanceCalculator::LuminanceCalculator(const QUrl &source) : m_source {source} {}
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int ImageLuminanceExtractor::LuminanceCalculator::execute()
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{
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QString path = m_source.isLocalFile() ? m_source.toLocalFile() : m_source.toString();
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if (path.startsWith("qrc:///"))
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path.replace(0, strlen("qrc:///"), ":/");
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else if (!m_source.isLocalFile())
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return Status::FAILED;
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const QImage image = QImage(path).scaled(128, 128, Qt::KeepAspectRatio);
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if (image.isNull())
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return Status::FAILED;
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int lumimance = 0;
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size_t count = 0;
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for (int i = 0; i < image.width(); i++)
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{
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for (int j = 0; j < image.height(); j++)
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{
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const QColor pixelColor = image.pixelColor(i, j);
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if (!pixelColor.isValid())
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continue;
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lumimance += 0.299*pixelColor.red() + 0.587*pixelColor.green() + 0.144*pixelColor.blue();
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count++;
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}
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}
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lumimance = (lumimance / count);
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return lumimance;
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}
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