C++ MapFrame::imageLayers方法代码示例

bool
CacheSeed::cacheTile(const MapFrame& mapf, const TileKey& key ) const
{
    bool gotData = false;

    for( ImageLayerVector::const_iterator i = mapf.imageLayers().begin(); i != mapf.imageLayers().end(); i++ )
    {
        ImageLayer* layer = i->get();
        if ( layer->isKeyValid( key ) )
        {
            GeoImage image = layer->createImage( key );
            if ( image.valid() )
                gotData = true;
        }
    }

    if ( mapf.elevationLayers().size() > 0 )
    {
        osg::ref_ptr<osg::HeightField> hf;
        mapf.getHeightField( key, false, hf );
        if ( hf.valid() )
            gotData = true;
    }

    return gotData;
}

void
StreamingTile::installRequests( const MapFrame& mapf, int stamp )
{
    StreamingTerrainNode* terrain     = getStreamingTerrain();
    OSGTileFactory*   tileFactory = terrain->getTileFactory();

    bool hasElevationLayer;
    {
        Threading::ScopedReadLock sharedLock( _tileLayersMutex );
        hasElevationLayer = this->getElevationLayer() != NULL;
    }

    if ( hasElevationLayer )
    {
        resetElevationRequests( mapf );     
    }

    // safely loop through the map layers and schedule imagery updates for each:
    for( ImageLayerVector::const_iterator i = mapf.imageLayers().begin(); i != mapf.imageLayers().end(); ++i )
    {
        updateImagery( i->get(), mapf, tileFactory );
    }

    _requestsInstalled = true;
}

void
StreamingTerrainNode::updateTaskServiceThreads( const MapFrame& mapf )
{
    //Get the maximum elevation weight
    float elevationWeight = 0.0f;
    for (ElevationLayerVector::const_iterator itr = mapf.elevationLayers().begin(); itr != mapf.elevationLayers().end(); ++itr)
    {
        ElevationLayer* layer = itr->get();
        float w = layer->getElevationLayerOptions().loadingWeight().value();
        if (w > elevationWeight) elevationWeight = w;
    }

    float totalImageWeight = 0.0f;
    for (ImageLayerVector::const_iterator itr = mapf.imageLayers().begin(); itr != mapf.imageLayers().end(); ++itr)
    {
        totalImageWeight += itr->get()->getImageLayerOptions().loadingWeight().value();
    }

    float totalWeight = elevationWeight + totalImageWeight;

    if (elevationWeight > 0.0f)
    {
        //Determine how many threads each layer gets
        int numElevationThreads = (int)osg::round((float)_numLoadingThreads * (elevationWeight / totalWeight ));
        OE_INFO << LC << "Elevation Threads = " << numElevationThreads << std::endl;
        getElevationTaskService()->setNumThreads( numElevationThreads );
    }

    for (ImageLayerVector::const_iterator itr = mapf.imageLayers().begin(); itr != mapf.imageLayers().end(); ++itr)
    {
        const TerrainLayerOptions& opt = itr->get()->getImageLayerOptions();
        int imageThreads = (int)osg::round((float)_numLoadingThreads * (opt.loadingWeight().value() / totalWeight ));
        OE_INFO << LC << "Image Threads for " << itr->get()->getName() << " = " << imageThreads << std::endl;
        getImageryTaskService( itr->get()->getUID() )->setNumThreads( imageThreads );
    }
}

void
TileModelFactory::createTileModel(const TileKey&           key, 
                                  const MapFrame&          frame,
                                  bool                     accumulate,
                                  osg::ref_ptr<TileModel>& out_model,
                                  ProgressCallback*        progress)
{

    osg::ref_ptr<TileModel> model = new TileModel( frame.getRevision(), frame.getMapInfo() );

    model->_useParentData = _terrainReqs->parentTexturesRequired();

    model->_tileKey = key;
    model->_tileLocator = GeoLocator::createForKey(key, frame.getMapInfo());

    OE_START_TIMER(fetch_imagery);

    // Fetch the image data and make color layers.
    unsigned index = 0;
    unsigned order = 0;
    for( ImageLayerVector::const_iterator i = frame.imageLayers().begin(); i != frame.imageLayers().end(); ++i )
    {
        ImageLayer* layer = i->get();

        if ( layer->getEnabled() && layer->isKeyInRange(key) )
        {
            BuildColorData build;
            build.init( key, layer, order, frame.getMapInfo(), _terrainOptions, _liveTiles.get(), model.get() );

            bool addedToModel = build.execute(progress);
            if ( addedToModel )
            {
                // only bump the order if we added something to the data model.
                order++;
            }
        }
    }

    if (progress)
        progress->stats()["fetch_imagery_time"] += OE_STOP_TIMER(fetch_imagery);

    
    // make an elevation layer.
    OE_START_TIMER(fetch_elevation);
    buildElevation(key, frame, accumulate, _terrainReqs->elevationTexturesRequired(), model.get(), progress);
    if (progress)
        progress->stats()["fetch_elevation_time"] += OE_STOP_TIMER(fetch_elevation);
    
    // make a normal map layer (if necessary)
    if ( _terrainReqs->normalTexturesRequired() )
    {
        OE_START_TIMER(fetch_normalmap);
        buildNormalMap(key, frame, accumulate, model.get(), progress);
        if (progress)
            progress->stats()["fetch_normalmap_time"] += OE_STOP_TIMER(fetch_normalmap);
    }

    // If nothing was added, not even a fallback heightfield, something went
    // horribly wrong. Leave without a tile model. Chances are that a parent tile
    // not not found in the live-tile registry.
    if ( model->_colorData.size() == 0 && !model->_elevationData.getHeightField() )
    {
        return;
    }

    // OK we are making a tile, so if there's no heightfield yet, make an empty one (and mark it
    // as fallback data of course)
    if ( !model->_elevationData.getHeightField() )
    {
        osg::HeightField* hf = HeightFieldUtils::createReferenceHeightField( key.getExtent(), 15, 15 );
        model->_elevationData = TileModel::ElevationData(
            hf,
            GeoLocator::createForKey(key, frame.getMapInfo()),
            true );
    }

    // look up the parent model and cache it.
    osg::ref_ptr<TileNode> parentTile;
    if ( _liveTiles->get(key.createParentKey(), parentTile) )
    {
        model->_parentModel = parentTile->getTileModel();
    }

    out_model = model.release();
}

void
TileModelFactory::createTileModel(const TileKey&           key, 
                                  const MapFrame&          frame,
                                  osg::ref_ptr<TileModel>& out_model) //,
                                  //bool&                    out_hasRealData)
{

    osg::ref_ptr<TileModel> model = new TileModel( frame.getRevision(), frame.getMapInfo() );
    model->_tileKey = key;
    model->_tileLocator = GeoLocator::createForKey(key, frame.getMapInfo());
    
    // Fetch the image data and make color layers.
    unsigned order = 0;
    for( ImageLayerVector::const_iterator i = frame.imageLayers().begin(); i != frame.imageLayers().end(); ++i )
    {
        ImageLayer* layer = i->get();

        if ( layer->getEnabled() )
        {
            BuildColorData build;
            build.init( key, layer, order, frame.getMapInfo(), _terrainOptions, model.get() );
            
            bool addedToModel = build.execute();
            if ( addedToModel )
            {
                // only bump the order if we added something to the data model.
                order++;
            }
        }
    }

    // make an elevation layer.
    BuildElevationData build;
    build.init( key, frame, _terrainOptions, model.get(), _hfCache );
    build.execute();


    // Bail out now if there's no data to be had.
    if ( model->_colorData.size() == 0 && !model->_elevationData.getHeightField() )
    {
        return;
    }

    // OK we are making a tile, so if there's no heightfield yet, make an empty one (and mark it
    // as fallback data of course)
    if ( !model->_elevationData.getHeightField() )
    {
        osg::HeightField* hf = HeightFieldUtils::createReferenceHeightField( key.getExtent(), 15, 15 );
        model->_elevationData = TileModel::ElevationData(
            hf,
            GeoLocator::createForKey(key, frame.getMapInfo()),
            true );
    }

    // look up the parent model and cache it.
    osg::ref_ptr<TileNode> parentTile;
    if ( _liveTiles->get(key.createParentKey(), parentTile) )
        model->_parentModel = parentTile->getTileModel();

    out_model = model.release();
}

// called from the UPDATE TRAVERSAL, because this method can potentially alter
// the scene graph.
bool
StreamingTile::serviceCompletedRequests( const MapFrame& mapf, bool tileTableLocked )
{
    //Don't do anything until we have been added to the scene graph
    if (!_hasBeenTraversed) return false;

    bool tileModified = false;

    if ( !_requestsInstalled )
        return false;

    // First service the tile generator:
    if ( _tileGenRequest.valid() && _tileGenRequest->isCompleted() )
    {
        CustomTerrainTechnique* tech = dynamic_cast<CustomTerrainTechnique*>( getTerrainTechnique() );
        if ( tech )
        {
            //TODO: consider waiting to apply if there are still more tile updates in the queue.
            if ( _tileUpdates.size() == 0 )
            {
                tileModified = tech->applyTileUpdates();
            }
        }
        _tileGenRequest = 0L;
    }


    // now deal with imagery.
    const LoadingPolicy& lp = getStreamingTerrain()->getLoadingPolicy();

    StreamingTerrainNode* terrain = getStreamingTerrain();

    //Check each layer independently.
    for( ImageLayerVector::const_iterator i = mapf.imageLayers().begin(); i != mapf.imageLayers().end(); ++i )
    {
        ImageLayer* imageLayer = i->get();

        bool checkForFinalImagery = false;

        CustomColorLayer colorLayer;
        if ( getCustomColorLayer( imageLayer->getUID(), colorLayer ) )
        {
            if ( lp.mode() == LoadingPolicy::MODE_PREEMPTIVE )
            {
                // in preemptive mode, always check for the final imagery - there are no intermediate
                // placeholders.
                checkForFinalImagery = true;
            }
            else if (lp.mode() == LoadingPolicy::MODE_SEQUENTIAL && 
                     readyForNewImagery(imageLayer, colorLayer.getLevelOfDetail()) )
            {
                // in sequential mode, we have to incrementally increase imagery resolution by
                // creating placeholders based of parent tiles, one LOD at a time.
                if ( colorLayer.getLevelOfDetail() + 1 < (int)_key.getLevelOfDetail() )
                {
                    // if the parent's image LOD is higher than ours, replace ours with the parent's
                    // since it is a higher-resolution placeholder:
                    if ( _family[Relative::PARENT].getImageLOD(colorLayer.getUID()) > colorLayer.getLevelOfDetail() )
                    {
                        osg::ref_ptr<Tile> parentTile;
                        getStreamingTerrain()->getTile( _family[Relative::PARENT].tileID, parentTile, !tileTableLocked );

                        // Set the color layer to the parent color layer as a placeholder.
                        CustomColorLayer parentColorLayer;
                        if ( parentTile->getCustomColorLayer( colorLayer.getUID(), parentColorLayer ) )
                        {
                            this->setCustomColorLayer( parentColorLayer );
                        }

                        // ... and queue up an update request.
                        queueTileUpdate( TileUpdate::UPDATE_IMAGE_LAYER, colorLayer.getUID() );
                    }
                }
                else
                {
                    // we've gone as far as we can with placeholders; time to check for the
                    // final imagery tile.
                    checkForFinalImagery = true;
                }
            }
        }

        if ( checkForFinalImagery )
        {
            // Then the image requests:
            for( TaskRequestList::iterator itr = _requests.begin(); itr != _requests.end(); )
            {
                bool increment = true;
                TileColorLayerRequest* r = static_cast<TileColorLayerRequest*>( itr->get() );
                //We only care about the current layer we are checking
                if ( r->_layerUID == imageLayer->getUID() )
                {
                    if ( itr->get()->isCompleted() )
                    {
                        if ( r->wasCanceled() )
                        {
                            //Reset the cancelled task to IDLE and give it a new progress callback.
                            r->setState( TaskRequest::STATE_IDLE );
//.........这里部分代码省略.........