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#include "imageanalyser.hpp"
#include <QtConcurrent/qtconcurrentrun.h>
#include <QtQuick/qquickitemgrabresult.h>
#include <qfuturewatcher.h>
#include <qimage.h>
#include <qquickwindow.h>
namespace caelestia {
ImageAnalyser::ImageAnalyser(QObject* parent)
: QObject(parent)
, m_futureWatcher(new QFutureWatcher<AnalyseResult>(this))
, m_source("")
, m_sourceItem(nullptr)
, m_rescaleSize(128)
, m_dominantColour(0, 0, 0)
, m_luminance(0) {
QObject::connect(m_futureWatcher, &QFutureWatcher<AnalyseResult>::finished, this, [this]() {
if (!m_futureWatcher->future().isResultReadyAt(0)) {
return;
}
const auto result = m_futureWatcher->result();
if (m_dominantColour != result.first) {
m_dominantColour = result.first;
emit dominantColourChanged();
}
if (!qFuzzyCompare(m_luminance + 1.0, result.second + 1.0)) {
m_luminance = result.second;
emit luminanceChanged();
}
});
}
QString ImageAnalyser::source() const {
return m_source;
}
void ImageAnalyser::setSource(const QString& source) {
if (m_source == source) {
return;
}
m_source = source;
emit sourceChanged();
if (m_sourceItem) {
m_sourceItem = nullptr;
emit sourceItemChanged();
}
requestUpdate();
}
QQuickItem* ImageAnalyser::sourceItem() const {
return m_sourceItem;
}
void ImageAnalyser::setSourceItem(QQuickItem* sourceItem) {
if (m_sourceItem == sourceItem) {
return;
}
m_sourceItem = sourceItem;
emit sourceItemChanged();
if (!m_source.isEmpty()) {
m_source = "";
emit sourceChanged();
}
requestUpdate();
}
int ImageAnalyser::rescaleSize() const {
return m_rescaleSize;
}
void ImageAnalyser::setRescaleSize(int rescaleSize) {
if (m_rescaleSize == rescaleSize) {
return;
}
m_rescaleSize = rescaleSize;
emit rescaleSizeChanged();
requestUpdate();
}
QColor ImageAnalyser::dominantColour() const {
return m_dominantColour;
}
qreal ImageAnalyser::luminance() const {
return m_luminance;
}
void ImageAnalyser::requestUpdate() {
if (m_source.isEmpty() && !m_sourceItem) {
return;
}
if (!m_sourceItem || (m_sourceItem->window() && m_sourceItem->window()->isVisible() && m_sourceItem->width() > 0 &&
m_sourceItem->height() > 0)) {
update();
} else if (m_sourceItem) {
if (!m_sourceItem->window()) {
QObject::connect(m_sourceItem, &QQuickItem::windowChanged, this, &ImageAnalyser::requestUpdate,
Qt::SingleShotConnection);
} else if (!m_sourceItem->window()->isVisible()) {
QObject::connect(m_sourceItem->window(), &QQuickWindow::visibleChanged, this, &ImageAnalyser::requestUpdate,
Qt::SingleShotConnection);
}
if (m_sourceItem->width() <= 0) {
QObject::connect(
m_sourceItem, &QQuickItem::widthChanged, this, &ImageAnalyser::requestUpdate, Qt::SingleShotConnection);
}
if (m_sourceItem->height() <= 0) {
QObject::connect(m_sourceItem, &QQuickItem::heightChanged, this, &ImageAnalyser::requestUpdate,
Qt::SingleShotConnection);
}
}
}
void ImageAnalyser::update() {
if (m_source.isEmpty() && !m_sourceItem) {
return;
}
if (m_futureWatcher->isRunning()) {
m_futureWatcher->cancel();
}
if (m_sourceItem) {
const QSharedPointer<const QQuickItemGrabResult> grabResult = m_sourceItem->grabToImage();
QObject::connect(grabResult.data(), &QQuickItemGrabResult::ready, this, [grabResult, this]() {
m_futureWatcher->setFuture(QtConcurrent::run(&ImageAnalyser::analyse, grabResult->image(), m_rescaleSize));
});
} else {
m_futureWatcher->setFuture(QtConcurrent::run([=, this](QPromise<AnalyseResult>& promise) {
const QImage image(m_source);
analyse(promise, image, m_rescaleSize);
}));
}
}
void ImageAnalyser::analyse(QPromise<AnalyseResult>& promise, const QImage& image, int rescaleSize) {
if (image.isNull()) {
qWarning() << "ImageAnalyser::analyse: image is null";
return;
}
QImage img = image;
if (rescaleSize > 0 && (img.width() > rescaleSize || img.height() > rescaleSize)) {
img = img.scaled(rescaleSize, rescaleSize, Qt::KeepAspectRatio, Qt::FastTransformation);
}
if (promise.isCanceled()) {
return;
}
if (img.format() != QImage::Format_ARGB32) {
img = img.convertToFormat(QImage::Format_ARGB32);
}
if (promise.isCanceled()) {
return;
}
const uchar* data = img.bits();
const int width = img.width();
const int height = img.height();
const qsizetype bytesPerLine = img.bytesPerLine();
std::unordered_map<quint32, int> colours;
qreal totalLuminance = 0.0;
int count = 0;
for (int y = 0; y < height; ++y) {
const uchar* line = data + y * bytesPerLine;
for (int x = 0; x < width; ++x) {
if (promise.isCanceled()) {
return;
}
const uchar* pixel = line + x * 4;
if (pixel[3] == 0) {
continue;
}
const quint32 mr = static_cast<quint32>(pixel[0] & 0xF8);
const quint32 mg = static_cast<quint32>(pixel[1] & 0xF8);
const quint32 mb = static_cast<quint32>(pixel[2] & 0xF8);
++colours[(mr << 16) | (mg << 8) | mb];
const qreal r = pixel[0] / 255.0;
const qreal g = pixel[1] / 255.0;
const qreal b = pixel[2] / 255.0;
totalLuminance += std::sqrt(0.299 * r * r + 0.587 * g * g + 0.114 * b * b);
++count;
}
}
quint32 dominantColour = 0;
int maxCount = 0;
for (const auto& [colour, colourCount] : colours) {
if (promise.isCanceled()) {
return;
}
if (colourCount > maxCount) {
dominantColour = colour;
maxCount = colourCount;
}
}
promise.addResult(qMakePair(QColor((0xFFu << 24) | dominantColour), count == 0 ? 0.0 : totalLuminance / count));
}
} // namespace caelestia
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