zoom_tiles_border_vertices_cache.h

// Copyright (c) 2018 Coronis Computing S.L. (Spain)
// All rights reserved.
//
// This file is part of EMODnet Quantized Mesh Generator for Cesium.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
// Author: Ricard Campos (ricardcd@gmail.com)

#ifndef EMODNET_QMGC_ZOOM_TILES_BORDER_VERTICES_CACHE_H
#define EMODNET_QMGC_ZOOM_TILES_BORDER_VERTICES_CACHE_H

#include <ctb.hpp>
#include <unordered_map>
#include <boost/functional/hash.hpp>
#include "tile_border_vertices.h"
#include "tin_creation/tin_creation_cgal_types.h"
#include "borders_data.h"


class ZoomTilesBorderVerticesCache
{
    // --- Private typedefs ---
    typedef TinCreation::Point_3 Point_3;

public:
    ZoomTilesBorderVerticesCache( const ctb::TileBounds& zoomBounds, const int& tileMaxCoord)
            : m_mapTileToBorderVertices()
            , m_zoomBounds(zoomBounds)
            , m_tileMaxCoord( tileMaxCoord )
            , m_numProcessedTiles(0)
            , m_tilesVisited()
            , m_tilesBeingProcessed()
    {
        m_numTiles = (zoomBounds.getMaxY()-zoomBounds.getMinY()+1)*(zoomBounds.getMaxX()-zoomBounds.getMinX()+1) ;
    }

    ZoomTilesBorderVerticesCache()
            : m_mapTileToBorderVertices()
            , m_zoomBounds()
            , m_tileMaxCoord(0)
            , m_numProcessedTiles(0)
            , m_numTiles(0)
            , m_tilesVisited() {}

    bool getConstrainedBorderVerticesForTile(const int& tileX, const int& tileY, BordersData& bd);

    bool setConstrainedBorderVerticesForTile( const int& tileX, const int& tileY,
                                              const std::vector<Point_3>& easternVerticesToPreserve,
                                              const std::vector<Point_3>& westernVerticesToPreserve,
                                              const std::vector<Point_3>& northernVerticesToPreserve,
                                              const std::vector<Point_3>& southernVerticesToPreserve ) ;

    int numCacheEntries() { return m_mapTileToBorderVertices.size(); }

    bool isTileVisited( const int& tileX, const int& tileY ) {
        std::pair<int,int> tileInd = std::make_pair( tileX, tileY ) ;
        return isTileVisited(tileInd) ;
    }

    bool isTileVisited( const std::pair<int, int>& tileInd ) {
        if (m_tilesVisited.count(tileInd) == 0)
            return false;
        else
            return m_tilesVisited[tileInd];
    }

    bool isTileBeingProcessed( const int& tileX, const int& tileY ) {
        std::pair<int,int> tileInd = std::make_pair( tileX, tileY ) ;
        return isTileBeingProcessed(tileInd) ;
    }

    bool isTileBeingProcessed( const std::pair<int,int>& tileInd ) {
        if (m_tilesBeingProcessed.count(tileInd) == 0)
            return false;
        else
            return m_tilesBeingProcessed[tileInd] ;
    }

    bool canTileStartProcessing( const int& tileX, const int& tileY ) ;

    bool allTilesProcessed() const { return m_numProcessedTiles >= m_numTiles ; }

    int getNumProcessed() const { return m_numProcessedTiles ; }

    int getNumTiles() const { return m_numTiles ; }

private:
    // --- Attributes ---
    ctb::TileBounds m_zoomBounds ;
    int m_tileMaxCoord ;
    int m_numTiles ;
    int m_numProcessedTiles ;
    std::unordered_map<std::pair<int,int>, TileBorderVertices, boost::hash<std::pair<int, int>>> m_mapTileToBorderVertices;
    std::unordered_map<std::pair<int,int>, bool, boost::hash<std::pair<int, int>>> m_tilesVisited;
    std::unordered_map<std::pair<int,int>, bool, boost::hash<std::pair<int, int>>> m_tilesBeingProcessed;

    bool isTileInBounds( const std::pair<int, int>& tileInd ) const {
        return isTileInBounds(tileInd.first, tileInd.second);
    }

    bool isTileInBounds( const int& tileX, const int& tileY ) const {
        return (tileX >= m_zoomBounds.getMinX() && tileX <= m_zoomBounds.getMaxX() &&
                tileY >= m_zoomBounds.getMinY() && tileY <= m_zoomBounds.getMaxY());
    }
};

#endif //EMODNET_QMGC_ZOOM_TILES_BORDER_VERTICES_CACHE_H