MapPainterCairo.h

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#ifndef OSMSCOUT_MAP_MAPPAINTERCAIRO_H
#define OSMSCOUT_MAP_MAPPAINTERCAIRO_H
 
/*
  This source is part of the libosmscout-map library
  Copyright (C) 2009  Tim Teulings
 
  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 <osmscoutmapcairo/MapCairoFeatures.h>
 
#include <mutex>
#include <unordered_map>
 
#if defined(__WIN32__) || defined(WIN32)
  #include <cairo.h>
#else
  #include <cairo/cairo.h>
#endif
 
#if defined(OSMSCOUT_MAP_CAIRO_HAVE_LIB_PANGO)
  #include <pango/pangocairo.h>
  #include <pango/pango-glyph.h>
#endif
 
#include <osmscoutmapcairo/MapCairoImportExport.h>
 
#include <osmscoutmap/MapPainter.h>
 
 
namespace osmscout {
 
  class OSMSCOUT_MAP_CAIRO_API MapPainterCairo : public MapPainter
  {
  public:
#if defined(OSMSCOUT_MAP_CAIRO_HAVE_LIB_PANGO)
    using CairoFont = PangoFontDescription*;
    using CairoNativeLabel = std::shared_ptr<PangoLayout>;
    struct PangoStandaloneGlyph {
      std::shared_ptr<PangoFont>        font;
      std::shared_ptr<PangoGlyphString> glyphString;
    };
 
    using CairoNativeGlyph = PangoStandaloneGlyph;
#else
    using CairoFont = cairo_scaled_font_t*;
    struct CairoNativeLabel {
      std::wstring          wstr;
      CairoFont             font;
      cairo_text_extents_t  textExtents;
      cairo_font_extents_t  fontExtents;
    };
 
    struct CairoNativeGlyph {
      std::string character;
      double width;
      double height;
    };
    //static constexpr double AverageCharacterWidth = 0.75;
#endif
 
    using CairoLabel = Label<CairoNativeGlyph, CairoNativeLabel>;
    using CairoGlyph = Glyph<CairoNativeGlyph>;
    using CairoLabelInstance = LabelInstance<CairoNativeGlyph, CairoNativeLabel>;
    using CairoLabelLayouter = LabelLayouter<CairoNativeGlyph, CairoNativeLabel, MapPainterCairo>;
    friend CairoLabelLayouter;
 
  private:
    CairoLabelLayouter labelLayouter;
 
    using FontMap = std::unordered_map<size_t,CairoFont>;    
 
    cairo_t                                *draw;            
    std::vector<cairo_surface_t*>          images;           
    std::vector<cairo_surface_t*>          patternImages;    
    std::vector<cairo_pattern_t*>          patterns;         
    FontMap                                fonts;            
    double                                 minimumLineWidth; 
 
    std::mutex                             mutex;            
 
  private:
    CairoFont GetFont(const Projection& projection,
                 const MapParameter& parameter,
                 double fontSize);
 
    void SetLineAttributes(const Color& color,
                           double width,
                           const std::vector<double>& dash);
 
    void DrawFillStyle(const Projection& projection,
                       const MapParameter& parameter,
                       const FillStyleRef& fill,
                       const BorderStyleRef& border);
 
  protected:
    bool HasIcon(const StyleConfig& styleConfig,
                 const Projection& projection,
                 const MapParameter& parameter,
                 IconStyle& style) override;
 
    bool HasPattern(const MapParameter& parameter,
                    const FillStyle& style);
 
    double GetFontHeight(const Projection& projection,
                       const MapParameter& parameter,
                       double fontSize) override;
 
    void DrawGround(const Projection& projection,
                    const MapParameter& parameter,
                    const FillStyle& style) override;
 
    std::shared_ptr<CairoLabel> Layout(const Projection& projection,
                                       const MapParameter& parameter,
                                       const std::string& text,
                                       double fontSize,
                                       double objectWidth,
                                       bool enableWrapping = false,
                                       bool contourLabel = false);
 
    osmscout::ScreenVectorRectangle GlyphBoundingBox(const CairoNativeGlyph &glyph) const;
 
    void DrawLabel(const Projection& projection,
                   const MapParameter& parameter,
                   const ScreenVectorRectangle& labelRectangle,
                   const LabelData& label,
                   const CairoNativeLabel& layout);
 
    void DrawGlyphs(const Projection &projection,
                    const MapParameter &parameter,
                    const osmscout::PathTextStyleRef& style,
                    const std::vector<CairoGlyph> &glyphs);
 
    void BeforeDrawing(const StyleConfig& styleConfig,
                       const Projection& projection,
                       const MapParameter& parameter,
                       const MapData& data) override;

    void RegisterRegularLabel(const Projection& projection,
                              const MapParameter& parameter,
                              const ObjectFileRef& ref,
                              const std::vector<LabelData>& labels,
                              const Vertex2D& position,
                              double objectWidth) override;

    void RegisterContourLabel(const Projection& projection,
                              const MapParameter& parameter,
                              const ObjectFileRef& ref,
                              const PathLabelData& label,
                              const LabelPath& labelPath) override;
 
    void DrawLabels(const Projection& projection,
                    const MapParameter& parameter,
                    const MapData& data) override;
 
    void DrawSymbol(const Projection& projection,
                    const MapParameter& parameter,
                    const Symbol& symbol,
                    const Vertex2D& screenPos,
                    double scaleFactor) override;
 
    void DrawIcon(const IconStyle* style,
                  const Vertex2D& centerPos,
                  double width, double height) override;
 
    void DrawPath(const Projection& projection,
                  const MapParameter& parameter,
                  const Color& color,
                  double width,
                  const std::vector<double>& dash,
                  LineStyle::CapStyle startCap,
                  LineStyle::CapStyle endCap,
                  const CoordBufferRange& coordRange) override;
 
    void DrawContourSymbol(const Projection& projection,
                           const MapParameter& parameter,
                           const Symbol& symbol,
                           const ContourSymbolData& data) override;
 
    void DrawArea(const Projection& projection,
                  const MapParameter& parameter,
                  const AreaData& area) override;
 
  public:
    explicit MapPainterCairo(const StyleConfigRef& styleConfig);
    ~MapPainterCairo() override;
 
 
    bool DrawMap(const Projection& projection,
                 const MapParameter& parameter,
                 const MapData& data,
                 cairo_t *draw,
                 RenderSteps startStep=RenderSteps::FirstStep,
                 RenderSteps endStep=RenderSteps::LastStep);
  };
}
 
#endif