LabelLayouterHelper.h

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#ifndef OSMSCOUT_MAP_LABELLAYOUTERHELPER_H
#define OSMSCOUT_MAP_LABELLAYOUTERHELPER_H
 
/*
  This source is part of the libosmscout-map library
  Copyright (C) 2018 Lukas Karas
  Copyright (C) 2024 Tim Teulngs
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library 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
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/
 
#include <memory>
#include <set>
#include <array>
 
#include <osmscoutmap/MapImportExport.h>
 
#include <osmscoutmap/StyleConfig.h>
#include <osmscoutmap/LabelPath.h>
#include <osmscout/system/Math.h>
 
#include <iostream>
 
namespace osmscout {
 
  struct ScreenPixelRectangle {
    int x;
    int y;
    int width;
    int height;
 
    // not initialised viewport
    ScreenPixelRectangle() = default;
 
    ScreenPixelRectangle(int x, int y, int width, int height)
    : x(x),
      y(y),
      width(width),
      height(height)
    {
    }

    bool Intersects(const ScreenPixelRectangle &other) const
    {
      return !(
              (x + width-1) < other.x ||
              x > (other.x + other.width-1) ||
              (y + height-1) < other.y ||
              y > (other.y + other.height-1)
      );
    }
  };
 
  struct ScreenVectorRectangle {
    double x;
    double y;
    double width;
    double height;
 
    // not initialised viewport
    ScreenVectorRectangle() = default;
 
    ScreenVectorRectangle(double x, double y, double width, double height)
    : x(x),
      y(y),
      width(width),
      height(height)
    {
    }
 
    ScreenVectorRectangle& Set(double nx, double ny, double nw, double nh)
    {
      x = nx;
      y = ny;
      width = nw;
      height = nh;
 
      return *this;
    }
 
    bool Intersects(const ScreenVectorRectangle &other) const
    {
      return !(
          (x + width) < other.x ||
          x > (other.x + other.width) ||
          (y + height) < other.y ||
          y > (other.y + other.height)
      );
    }
  };

  class OSMSCOUT_MAP_API ScreenRectMask CLASS_FINAL
  {
  private:
    int                   cellFrom{0}; // First used byte of mask
    int                   cellTo{0};   // Last used byte of mask
    int                   rowFrom{0};  // First row of mask
    int                   rowTo{0};    // Last row of mask
    std::vector<uint64_t> bitmask;     // bitmask for one row
 
  public:
    ScreenRectMask() = default;
    ScreenRectMask(size_t screenWidth,
                   const ScreenPixelRectangle &rect);
 
    bool Intersects(const ScreenRectMask& other) const;

    int GetFirstRow() const {
      return rowFrom;
    }

    int GetLastRow() const {
      return rowTo;
    }

    int GetFirstCell() const {
      return cellFrom;
    }

    int GetLastCell() const {
      return cellTo;
    }

    uint64_t GetCell(size_t idx) const;
  };
 
  class OSMSCOUT_MAP_API ScreenMask CLASS_FINAL
  {
  private:
    std::vector<uint64_t> bitmask;
    size_t                rowLength;
    size_t                height;
 
  public:
    ScreenMask(size_t width, size_t height);
 
    void AddMask(const ScreenRectMask& mask);
    bool HasCollision(const ScreenRectMask& mask) const;
  };
}
 
#endif