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#include "cachingimagemanager.hpp"
#include <QObject>
#include <QtQuick/QQuickItem>
#include <QtQuick/QQuickWindow>
#include <QCryptographicHash>
#include <QThreadPool>
#include <QFile>
#include <QDir>
#include <QPainter>
#include <QImageReader>
qreal CachingImageManager::effectiveScale() const {
if (m_item && m_item->window()) {
return m_item->window()->devicePixelRatio();
}
return 1.0;
}
int CachingImageManager::effectiveWidth() const {
if (!m_item) {
return 0;
}
int width = static_cast<int>(std::ceil(m_item->width() * effectiveScale()));
m_item->setProperty("sourceWidth", width);
return width;
}
int CachingImageManager::effectiveHeight() const {
if (!m_item) {
return 0;
}
int height = static_cast<int>(std::ceil(m_item->height() * effectiveScale()));
m_item->setProperty("sourceHeight", height);
return height;
}
QQuickItem* CachingImageManager::item() const {
return m_item;
}
void CachingImageManager::setItem(QQuickItem* item) {
if (m_item == item) {
return;
}
if (m_widthConn) {
disconnect(m_widthConn);
}
if (m_heightConn) {
disconnect(m_heightConn);
}
m_item = item;
emit itemChanged();
if (item) {
m_widthConn = connect(item, &QQuickItem::widthChanged, this, [this]() { updateSource(); });
m_heightConn = connect(item, &QQuickItem::heightChanged, this, [this]() { updateSource(); });
updateSource();
}
}
QUrl CachingImageManager::cacheDir() const {
return m_cacheDir;
}
void CachingImageManager::setCacheDir(const QUrl& cacheDir) {
if (m_cacheDir == cacheDir) {
return;
}
m_cacheDir = cacheDir;
if (!m_cacheDir.path().endsWith("/")) {
m_cacheDir.setPath(m_cacheDir.path() + "/");
}
emit cacheDirChanged();
}
QString CachingImageManager::path() const {
return m_path;
}
void CachingImageManager::setPath(const QString& path) {
if (m_path == path) {
return;
}
m_path = path;
emit pathChanged();
if (!path.isEmpty()) {
updateSource(path);
}
}
void CachingImageManager::updateSource() {
updateSource(m_path);
}
void CachingImageManager::updateSource(const QString& path) {
if (path.isEmpty() || path == m_shaPath) {
// Path is empty or already calculating sha for path
return;
}
m_shaPath = path;
const QPointer<CachingImageManager> self(this);
QThreadPool::globalInstance()->start([path, self] {
const QString sha = self->sha256sum(path);
QMetaObject::invokeMethod(self, [path, sha, self]() {
if (!self || self->m_path != path) {
// Object is destroyed or path has changed, ignore
return;
}
const int width = self->effectiveWidth();
const int height = self->effectiveHeight();
if (!self->m_item || !width || !height) {
return;
}
const QString fillMode = self->m_item->property("fillMode").toString();
const QString filename = QString("%1@%2x%3-%4.png")
.arg(sha).arg(width).arg(height)
.arg(fillMode == "PreserveAspectCrop" ? "crop" : fillMode == "PreserveAspectFit" ? "fit" : "stretch");
const QUrl cache = self->m_cacheDir.resolved(QUrl(filename));
if (self->m_cachePath == cache) {
return;
}
self->m_cachePath = cache;
emit self->cachePathChanged();
if (!cache.isLocalFile()) {
qWarning() << "CachingImageManager::updateSource: cachePath" << cache << "is not a local file";
return;
}
const QImageReader reader(cache.toLocalFile());
if (reader.canRead()) {
self->m_item->setProperty("source", cache);
} else {
self->m_item->setProperty("source", QUrl::fromLocalFile(path));
self->createCache(path, cache.toLocalFile(), fillMode, QSize(width, height));
}
// Clear current running sha if same
if (self->m_shaPath == path) {
self->m_shaPath = QString();
}
}, Qt::QueuedConnection);
});
}
QUrl CachingImageManager::cachePath() const {
return m_cachePath;
}
void CachingImageManager::createCache(const QString& path, const QString& cache, const QString& fillMode, const QSize& size) const {
QThreadPool::globalInstance()->start([path, cache, fillMode, size] {
QImage image(path);
if (image.isNull()) {
qWarning() << "CachingImageManager::createCache: failed to read" << path;
return;
}
image.convertTo(QImage::Format_ARGB32);
if (fillMode == "PreserveAspectCrop") {
image = image.scaled(size, Qt::KeepAspectRatioByExpanding, Qt::SmoothTransformation);
} else if (fillMode == "PreserveAspectFit") {
image = image.scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation);
} else {
image = image.scaled(size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
}
if (fillMode == "PreserveAspectCrop" || fillMode == "PreserveAspectFit") {
QImage canvas(size, QImage::Format_ARGB32);
canvas.fill(Qt::transparent);
QPainter painter(&canvas);
painter.drawImage((size.width() - image.width()) / 2, (size.height() - image.height()) / 2, image);
painter.end();
image = canvas;
}
const QString parent = QFileInfo(cache).absolutePath();
if (!QDir().mkpath(parent) || !image.save(cache)) {
qWarning() << "CachingImageManager::createCache: failed to save to" << cache;
}
});
}
QString CachingImageManager::sha256sum(const QString& path) const {
QFile file(path);
if (!file.open(QIODevice::ReadOnly)) {
qWarning() << "CachingImageManager::sha256sum: failed to open" << path;
return "";
}
QCryptographicHash hash(QCryptographicHash::Sha256);
hash.addData(&file);
file.close();
return hash.result().toHex();
}
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