File indexing completed on 2024-05-12 16:28:12

 // SPDX-FileCopyrightText: 2021 Tobias Fella <fella@posteo.de>
 // SPDX-License-Identifier: LGPL-2.0-or-later
 
 #include "blurhashimageprovider.h"
 
 #include <QImage>
 #include <QString>
 
 #include "blurhash.hpp"
 
 /*
  * Qt unfortunately re-encodes the base83 string in QML.
  * The only special ASCII characters used in the blurhash base83 string are:
  * #$%*+,-.:;=?@[]^_{|}~
  * QUrl::fromPercentEncoding is too greedy, and spits out invalid characters
  * for parts of valid base83 like %14.
  */
 // clang-format off
 static const QMap<QLatin1String, QLatin1String> knownEncodings = {
     {QLatin1String("%23A"), QLatin1String(":")},
     {QLatin1String("%3F"), QLatin1String("?")},
     {QLatin1String("%23"), QLatin1String("#")},
     {QLatin1String("%5B"), QLatin1String("[")},
     {QLatin1String("%5D"), QLatin1String("]")},
     {QLatin1String("%40"), QLatin1String("@")},
     {QLatin1String("%24"), QLatin1String("$")},
     {QLatin1String("%2A"), QLatin1String("*")},
     {QLatin1String("%2B"), QLatin1String("+")},
     {QLatin1String("%2C"), QLatin1String(",")},
     {QLatin1String("%2D"), QLatin1String("-")},
     {QLatin1String("%2E"), QLatin1String(".")},
     {QLatin1String("%3D"), QLatin1String("=")},
     {QLatin1String("%25"), QLatin1String("%")},
     {QLatin1String("%5E"), QLatin1String("^")},
     {QLatin1String("%7C"), QLatin1String("|")},
     {QLatin1String("%7B"), QLatin1String("{")},
     {QLatin1String("%7D"), QLatin1String("}")},
     {QLatin1String("%7E"), QLatin1String("~")},
 };
 // clang-format on
 
 class AsyncImageResponseRunnable : public QObject, public QRunnable
 {
     Q_OBJECT
 
 Q_SIGNALS:
     void done(QImage image);
 
 public:
     AsyncImageResponseRunnable(const QString &id, const QSize &requestedSize)
         : m_id(id)
         , m_requestedSize(requestedSize)
     {
         if (m_requestedSize.width() == -1) {
             m_requestedSize.setWidth(64);
         }
         if (m_requestedSize.height() == -1) {
             m_requestedSize.setHeight(64);
         }
     }
 
     void run() override
     {
         if (m_id.isEmpty()) {
             return;
         }
 
         QString decodedId = m_id;
 
         QMap<QLatin1String, QLatin1String>::const_iterator i;
         for (i = knownEncodings.constBegin(); i != knownEncodings.constEnd(); ++i)
             decodedId.replace(i.key(), i.value());
 
         auto data = blurhash::decode(decodedId.toLatin1().constData(), m_requestedSize.width(), m_requestedSize.height());
         QImage image(data.image.data(), static_cast<int>(data.width), static_cast<int>(data.height), static_cast<int>(data.width * 3), QImage::Format_RGB888);
 
         Q_EMIT done(image.convertToFormat(QImage::Format_RGB32));
     }
 
 private:
     QString m_id;
     QSize m_requestedSize;
 };
 
 AsyncImageResponse::AsyncImageResponse(const QString &id, const QSize &requestedSize, QThreadPool *pool)
 {
     auto runnable = new AsyncImageResponseRunnable(id, requestedSize);
     connect(runnable, &AsyncImageResponseRunnable::done, this, &AsyncImageResponse::handleDone);
     pool->start(runnable);
 }
 
 void AsyncImageResponse::handleDone(QImage image)
 {
     m_image = image;
     Q_EMIT finished();
 }
 
 QQuickTextureFactory *AsyncImageResponse::textureFactory() const
 {
     return QQuickTextureFactory::textureFactoryForImage(m_image);
 }
 
 QQuickImageResponse *BlurhashImageProvider::requestImageResponse(const QString &id, const QSize &requestedSize)
 {
     return new AsyncImageResponse(id, requestedSize, &pool);
 }
 
 #include "blurhashimageprovider.moc"