osg::Image* QgsOsgEarthTileSource::createImage( const TileKey& key, ProgressCallback* progress )
{
Q_UNUSED( key );
Q_UNUSED( progress );
osg::ref_ptr<osg::Image> image;
if ( intersects( &key ) )
{
//Get the extents of the tile
double xmin, ymin, xmax, ymax;
key.getExtent().getBounds( xmin, ymin, xmax, ymax );
int tileSize = getPixelsPerTile();
int target_width = tileSize;
int target_height = tileSize;
QgsDebugMsg( "QGIS: xmin:" + QString::number( xmin ) + " ymin:" + QString::number( ymin ) + " ymax:" + QString::number( ymax ) + " ymax " + QString::number( ymax ) );
//Return if parameters are out of range.
if ( target_width <= 0 || target_height <= 0 )
{
return 0;
}
QImage* qImage = createImage( target_width, target_height );
if ( !qImage )
{
return 0;
}
QgsMapRenderer* mainRenderer = mQGisIface->mapCanvas()->mapRenderer();
mMapRenderer->setLayerSet( mainRenderer->layerSet() );
mMapRenderer->setOutputSize( QSize( qImage->width(), qImage->height() ), qImage->logicalDpiX() );
QgsRectangle mapExtent( xmin, ymin, xmax, ymax );
mMapRenderer->setExtent( mapExtent );
QPainter thePainter( qImage );
//thePainter.setRenderHint(QPainter::Antialiasing); //make it look nicer
mMapRenderer->render( &thePainter );
unsigned char* data = qImage->bits();
image = new osg::Image;
//The pixel format is always RGBA to support transparency
image->setImage( qImage->width(), qImage->height(), 1,
4,
GL_BGRA, GL_UNSIGNED_BYTE, //Why not GL_RGBA - QGIS bug?
data,
osg::Image::NO_DELETE, 1 );
image->flipVertical();
}
//Create a transparent image if we don't have an image
if ( !image.valid() )
{
return ImageUtils::createEmptyImage();
}
return image.release();
}
osg::Image* QgsOsgEarthTileSource::createImage( const TileKey& key, ProgressCallback* progress )
{
QString kname = key.str().c_str();
kname.replace( '/', '_' );
Q_UNUSED( progress );
//Get the extents of the tile
int tileSize = getPixelsPerTile();
if ( tileSize <= 0 )
{
QgsDebugMsg( "Tile size too small." );
return ImageUtils::createEmptyImage();
}
QgsRectangle viewExtent = mQGisIface->mapCanvas()->fullExtent();
if ( mCoordTransform )
{
QgsDebugMsg( QString( "vext0:%1" ).arg( viewExtent.toString( 5 ) ) );
viewExtent = mCoordTransform->transformBoundingBox( viewExtent );
}
QgsDebugMsg( QString( "vext1:%1" ).arg( viewExtent.toString( 5 ) ) );
double xmin, ymin, xmax, ymax;
key.getExtent().getBounds( xmin, ymin, xmax, ymax );
QgsRectangle tileExtent( xmin, ymin, xmax, ymax );
QgsDebugMsg( QString( "text0:%1" ).arg( tileExtent.toString( 5 ) ) );
if ( !viewExtent.intersects( tileExtent ) )
{
QgsDebugMsg( QString( "earth tile key:%1 ext:%2: NO INTERSECT" ).arg( kname ).arg( tileExtent.toString( 5 ) ) );
return ImageUtils::createEmptyImage();
}
#ifdef USE_RENDERER
QImage *qImage = createQImage( tileSize, tileSize );
if ( !qImage )
{
QgsDebugMsg( QString( "earth tile key:%1 ext:%2: EMPTY IMAGE" ).arg( kname ).arg( tileExtent.toString( 5 ) ) );
return ImageUtils::createEmptyImage();
}
mMapRenderer->setLayerSet( mQGisIface->mapCanvas()->mapRenderer()->layerSet() );
mMapRenderer->setOutputSize( QSize( tileSize, tileSize ), qImage->logicalDpiX() );
mMapRenderer->setExtent( tileExtent );
QPainter thePainter( qImage );
mMapRenderer->render( &thePainter );
#else
mMapSettings.setLayers( mQGisIface->mapCanvas()->mapSettings().layers() );
mMapSettings.setOutputSize( QSize( tileSize, tileSize ) );
mMapSettings.setOutputDpi( QgsApplication::desktop()->logicalDpiX() );
mMapSettings.setExtent( tileExtent );
mMapSettings.setBackgroundColor( QColor( 0, 0, 0, 0 ) );
QgsMapRendererSequentialJob job( mMapSettings );
job.start();
job.waitForFinished();
QImage *qImage = new QImage( job.renderedImage() );
if ( !qImage )
{
QgsDebugMsg( QString( "earth tile key:%1 ext:%2: EMPTY IMAGE" ).arg( kname ).arg( tileExtent.toString( 5 ) ) );
return ImageUtils::createEmptyImage();
}
Q_ASSERT( qImage->logicalDpiX() == QgsApplication::desktop()->logicalDpiX() );
Q_ASSERT( qImage->format() == QImage::Format_ARGB32_Premultiplied );
#endif
QgsDebugMsg( QString( "earth tile key:%1 ext:%2" ).arg( kname ).arg( tileExtent.toString( 5 ) ) );
#if 0
qImage->save( QString( "/tmp/tile-%1.png" ).arg( kname ) );
#endif
osg::ref_ptr<osg::Image> image = new osg::Image;
//The pixel format is always RGBA to support transparency
image->setImage( tileSize, tileSize, 1, 4, // width, height, depth, pixelFormat?
GL_BGRA, GL_UNSIGNED_BYTE, //Why not GL_RGBA - Qt bug?
qImage->bits(),
osg::Image::NO_DELETE, 1 );
image->flipVertical();
//Create a transparent image if we don't have an image
if ( !image.valid() )
{
QgsDebugMsg( "image is invalid" );
return ImageUtils::createEmptyImage();
}
QgsDebugMsg( "returning image" );
return image.release();
}
