File indexing completed on 2024-04-21 14:51:52

 // SPDX-FileCopyrightText: 2014 Friedrich W. H. Kossebau <kossebau@kde.org>
 // SPDX-License-Identifier: LGPL-2.1-or-later
 
 #include "thumbnailer.h"
 
 // Marble
 #include <MarbleModel.h>
 #include <FileManager.h>
 #include <GeoDataDocument.h>
 #include <GeoPainter.h>
 #include <GeoDataLatLonAltBox.h>
 #include <ViewportParams.h>
 #include <RenderPlugin.h>
 #include <GeoDataTreeModel.h>
 
 static const int timeoutTime = 5000; // in msec
 
 namespace Marble {
 
 GeoDataThumbnailer::GeoDataThumbnailer()
   : ThumbCreator()
   , m_marbleMap()
 {
     m_marbleMap.setMapThemeId(QStringLiteral("earth/openstreetmap/openstreetmap.dgml"));
     m_marbleMap.setProjection(Equirectangular);
     m_marbleMap.setMapQualityForViewContext( PrintQuality, Still );
     m_marbleMap.setViewContext( Still );
     for( RenderPlugin* plugin: m_marbleMap.renderPlugins() ) {
         plugin->setEnabled( false );
     }
 
     m_outtimer.setInterval(timeoutTime);
     m_outtimer.setSingleShot(true);
     connect(&m_outtimer, SIGNAL(timeout()), &m_eventLoop, SLOT(quit()));
 
     MarbleModel *const model = m_marbleMap.model();
     connect(model->treeModel(), &GeoDataTreeModel::added, this, &GeoDataThumbnailer::onGeoDataObjectAdded);
     connect(model->fileManager(), &FileManager::fileError, this,
         [this](const QString& path, const QString& error) {
            m_hadErrors = true;
            m_outtimer.stop();
            m_eventLoop.quit();
         });
 }
 
 
 GeoDataThumbnailer::~GeoDataThumbnailer()
 {
 }
 
 bool GeoDataThumbnailer::create(const QString &path, int width, int height, QImage &image)
 {
     m_marbleMap.setSize(width, height);
 
     MarbleModel *const model = m_marbleMap.model();
 
     // load the document content
     m_loadingCompleted = false;
     m_hadErrors = false;
 
     m_currentFilename = path;
     model->addGeoDataFile(path);
 
     if ((!m_loadingCompleted) && (!m_hadErrors)) {
         // loading is done async, so wait here for a while
         // Using a QEventLoop here seems fine, thumbnailers are only used inside the
         // thumbnail protocol slave, it seems
         m_outtimer.start();
         m_eventLoop.exec(QEventLoop::ExcludeUserInputEvents);
     }
 
     if (m_loadingCompleted) {
         // TODO: limit to shown map, if full earth is used
         image = QImage(width, height, QImage::Format_ARGB32);
         image.fill(qRgba(0, 0, 0, 0));
 
         // Create a painter that will do the painting.
         GeoPainter geoPainter( &image, m_marbleMap.viewport(),
                                m_marbleMap.mapQuality() );
 
         m_marbleMap.paint( geoPainter, QRect() ); // TODO: dirtyRect seems currently unused, make sure it is
     }
 
     model->removeGeoData(path);
     m_currentFilename.clear();
 
     return m_loadingCompleted;
 }
 
 static qreal radius(qreal zoom)
 {
     return pow(M_E, (zoom / 200.0));
 }
 
 void GeoDataThumbnailer::onGeoDataObjectAdded( GeoDataObject* object )
 {
     const auto document = geodata_cast<GeoDataDocument>(object);
 
     if (!document) {
         return;
     }
 
     if (document->fileName() != m_currentFilename) {
         return;
     }
 
     const GeoDataLatLonAltBox latLonAltBox = document->latLonAltBox();
     const GeoDataCoordinates center = latLonAltBox.center();
 
     int newRadius = m_marbleMap.radius();
     //prevent divide by zero
     if( latLonAltBox.height() && latLonAltBox.width() ) {
         const ViewportParams* viewparams = m_marbleMap.viewport();
         //work out the needed zoom level
         const int horizontalRadius = ( 0.25 * M_PI ) * ( viewparams->height() / latLonAltBox.height() );
         const int verticalRadius = ( 0.25 * M_PI ) * ( viewparams->width() / latLonAltBox.width() );
         newRadius = qMin<int>( horizontalRadius, verticalRadius );
         newRadius = qMax<int>(radius(m_marbleMap.minimumZoom()), qMin<int>(newRadius, radius(m_marbleMap.maximumZoom())));
     }
 
     m_marbleMap.centerOn( center.longitude(GeoDataCoordinates::Degree), center.latitude(GeoDataCoordinates::Degree) );
 
     m_marbleMap.setRadius( newRadius );
 
     m_loadingCompleted = true;
     m_outtimer.stop();
     m_eventLoop.quit();
 }
 
 }
 
 #include "moc_thumbnailer.cpp"