File indexing completed on 2024-04-21 03:50:01

 // SPDX-License-Identifier: LGPL-2.1-or-later
 //
 // SPDX-FileCopyrightText: 2010-2012 Bernhard Beschow <bbeschow@cs.tu-berlin.de>
 //
 
 
 // local
 #include "TileScalingTextureMapper.h"
 
 // posix
 #include <cmath>
 
 // Qt
 #include <qmath.h>
 
 // Marble
 #include "GeoPainter.h"
 #include "ScanlineTextureMapperContext.h"
 #include "StackedTileLoader.h"
 #include "TextureColorizer.h"
 #include "TileLoaderHelper.h"
 #include "StackedTile.h"
 #include "MathHelper.h"
 #include "ViewportParams.h"
 
 using namespace Marble;
 
 TileScalingTextureMapper::TileScalingTextureMapper( StackedTileLoader *tileLoader, QObject *parent )
     : QObject( parent ),
       TextureMapperInterface(),
       m_tileLoader( tileLoader ),
       m_cache( 100 ),
       m_radius( 0 )
 {
     connect( tileLoader, SIGNAL(tileLoaded(TileId)),
              this,       SLOT(removePixmap(TileId)) );
     connect( tileLoader, SIGNAL(cleared()),
              this,       SLOT(clearPixmaps()) );
 }
 
 void TileScalingTextureMapper::mapTexture( GeoPainter *painter,
                                            const ViewportParams *viewport,
                                            int tileZoomLevel,
                                            const QRect &dirtyRect,
                                            TextureColorizer *texColorizer )
 {
     if ( viewport->radius() <= 0 )
         return;
 
     if ( texColorizer || m_radius != viewport->radius() ) {
         if ( m_canvasImage.size() != viewport->size() || m_radius != viewport->radius() ) {
             const QImage::Format optimalFormat = ScanlineTextureMapperContext::optimalCanvasImageFormat( viewport );
 
             if ( m_canvasImage.size() != viewport->size() || m_canvasImage.format() != optimalFormat ) {
                 m_canvasImage = QImage( viewport->size(), optimalFormat );
             }
 
             if ( !viewport->mapCoversViewport() ) {
                 m_canvasImage.fill( 0 );
             }
 
             m_repaintNeeded = true;
         }
 
         if ( m_repaintNeeded ) {
             mapTexture( painter, viewport, tileZoomLevel, texColorizer );
 
             m_radius = viewport->radius();
             m_repaintNeeded = false;
         }
 
         painter->drawImage( dirtyRect, m_canvasImage, dirtyRect );
     } else {
         mapTexture( painter, viewport, tileZoomLevel, texColorizer );
 
         m_radius = viewport->radius();
     }
 }
 
 void TileScalingTextureMapper::mapTexture( GeoPainter *painter, const ViewportParams *viewport, int tileZoomLevel, TextureColorizer *texColorizer )
 {
     const int imageHeight = viewport->height();
     const int imageWidth  = viewport->width();
     const qint64  radius  = viewport->radius();
 
     const bool highQuality  = ( painter->mapQuality() == HighQuality
                                 || painter->mapQuality() == PrintQuality );
 
     // Reset backend
     m_tileLoader->resetTilehash();
 
     // Calculate translation of center point
     const qreal centerLon = viewport->centerLongitude();
     const qreal centerLat = viewport->centerLatitude();
 
     const int numTilesX = m_tileLoader->tileRowCount( tileZoomLevel );
     const int numTilesY = m_tileLoader->tileColumnCount( tileZoomLevel );
     Q_ASSERT( numTilesX > 0 );
     Q_ASSERT( numTilesY > 0 );
 
     const qreal xNormalizedCenter = 0.5 + 0.5 * centerLon / M_PI;
     const int minTileX = qFloor( numTilesX * ( xNormalizedCenter - imageWidth/( 8.0 * radius ) ) );
     const int maxTileX = numTilesX * ( xNormalizedCenter + imageWidth/( 8.0 * radius ) );
 
     const qreal yNormalizedCenter = 0.5 - 0.5 * asinh( tan( centerLat ) ) / M_PI;
     const int minTileY = qMax( qreal( numTilesY * ( yNormalizedCenter - imageHeight/( 8.0 * radius ) ) ),
                                qreal( 0.0 ) );
     const int maxTileY = qMin( qreal( numTilesY * ( yNormalizedCenter + imageHeight/( 8.0 * radius ) ) ),
                                qreal( numTilesY - 1.0 ) );
 
     if ( m_radius != radius ) {
         m_cache.clear();
     }
 
     if ( texColorizer || m_radius != radius ) {
         QPainter imagePainter( &m_canvasImage );
         imagePainter.setRenderHint( QPainter::SmoothPixmapTransform, highQuality );
 
         for ( int tileY = minTileY; tileY <= maxTileY; ++tileY ) {
             for ( int tileX = minTileX; tileX <= maxTileX; ++tileX ) {
                 const qreal xLeft   = ( 4.0 * radius ) * ( ( tileX     ) / (qreal)numTilesX - xNormalizedCenter ) + ( imageWidth / 2.0 );
                 const qreal xRight  = ( 4.0 * radius ) * ( ( tileX + 1 ) / (qreal)numTilesX - xNormalizedCenter ) + ( imageWidth / 2.0 );
                 const qreal yTop    = ( 4.0 * radius ) * ( ( tileY     ) / (qreal)numTilesY - yNormalizedCenter ) + ( imageHeight / 2.0 );
                 const qreal yBottom = ( 4.0 * radius ) * ( ( tileY + 1 ) / (qreal)numTilesY - yNormalizedCenter ) + ( imageHeight / 2.0 );
 
                 const QRectF rect = QRectF( QPointF( xLeft, yTop ), QPointF( xRight, yBottom ) );
                 const TileId stackedId = TileId( 0, tileZoomLevel, ( ( tileX % numTilesX ) + numTilesX ) % numTilesX, tileY );
 
                 const StackedTile *const tile = m_tileLoader->loadTile( stackedId );
 
                 imagePainter.drawImage( rect, *tile->resultImage() );
             }
         }
 
         if ( texColorizer ) {
             texColorizer->colorize( &m_canvasImage, viewport, painter->mapQuality() );
         }
     } else {
         painter->save();
         painter->setRenderHint( QPainter::SmoothPixmapTransform, highQuality );
 
         for ( int tileY = minTileY; tileY <= maxTileY; ++tileY ) {
             for ( int tileX = minTileX; tileX <= maxTileX; ++tileX ) {
                 const qreal xLeft   = ( 4.0 * radius ) * ( ( tileX     ) / (qreal)numTilesX - xNormalizedCenter ) + ( imageWidth / 2.0 );
                 const qreal xRight  = ( 4.0 * radius ) * ( ( tileX + 1 ) / (qreal)numTilesX - xNormalizedCenter ) + ( imageWidth / 2.0 );
                 const qreal yTop    = ( 4.0 * radius ) * ( ( tileY     ) / (qreal)numTilesY - yNormalizedCenter ) + ( imageHeight / 2.0 );
                 const qreal yBottom = ( 4.0 * radius ) * ( ( tileY + 1 ) / (qreal)numTilesY - yNormalizedCenter ) + ( imageHeight / 2.0 );
 
                 const QRectF rect = QRectF( QPointF( xLeft, yTop ), QPointF( xRight, yBottom ) );
                 const TileId stackedId = TileId( 0, tileZoomLevel, ( ( tileX % numTilesX ) + numTilesX ) % numTilesX, tileY );
                 const StackedTile *const tile = m_tileLoader->loadTile( stackedId ); // load tile here for every frame, otherwise cleanupTilehash() clears all visible tiles
 
                 const QSize size = QSize( qCeil( rect.right() - rect.left() ), qCeil( rect.bottom() - rect.top() ) );
                 const int cacheHash = 2 * ( size.width() % 2 ) + ( size.height() % 2 );
                 const TileId cacheId = TileId( cacheHash, stackedId.zoomLevel(), stackedId.x(), stackedId.y() );
 
                 const QPixmap *const im_cached = m_cache[cacheId];
                 const QPixmap *im = im_cached;
                 if ( im == nullptr ) {
                     im = new QPixmap( QPixmap::fromImage( tile->resultImage()->scaled( size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation ) ) );
                 }
                 painter->drawPixmap( rect.topLeft(), *im );
 
                 if (im != im_cached)
                     m_cache.insert( cacheId, im );
             }
         }
 
         painter->restore();
     }
 
     m_tileLoader->cleanupTilehash();
 }
 
 void TileScalingTextureMapper::removePixmap( const TileId &tileId )
 {
     const TileId stackedTileId( 0, tileId.zoomLevel(), tileId.x(), tileId.y() );
     for ( int i = 0; i < 4; ++i ) {
         const TileId id = TileId( i, stackedTileId.zoomLevel(), stackedTileId.x(), stackedTileId.y() );
 
         m_cache.remove( id );
     }
 }
 
 void TileScalingTextureMapper::clearPixmaps()
 {
     m_cache.clear();
 }
 
 #include "moc_TileScalingTextureMapper.cpp"