text-renderer.h

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/*

Copyright (C) 2016-2017 John W. Eaton
Copyright (C) 2009-2016 Michael Goffioul

This file is part of Octave.

Octave 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.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if ! defined (octave_text_renderer_h)
#define octave_text_renderer_h 1

#include "octave-config.h"

#include <list>
#include <string>

#include "caseless-str.h"
#include "dMatrix.h"
#include "uint8NDArray.h"

#include "txt-eng.h"

namespace octave
{
  class base_text_renderer;

  class
  OCTINTERP_API
  text_renderer
  {
  public:

    text_renderer (void);

    ~text_renderer (void);

    bool ok (void) const;

    Matrix get_extent (text_element *elt, double rotation = 0.0);

    Matrix get_extent (const std::string& txt, double rotation = 0.0,
                       const caseless_str& interpreter = "tex");

    void set_font (const std::string& name, const std::string& weight,
                   const std::string& angle, double size);

    void set_color (const Matrix& c);

    void text_to_pixels (const std::string& txt,
                         uint8NDArray& pxls, Matrix& bbox,
                         int halign, int valign, double rotation = 0.0,
                         const caseless_str& interpreter = "tex",
                         bool handle_rotation = true);

    class font
    {
    public:

      font (void)
        : name (), weight (), angle (), size (0)
      { }

      font (const std::string& nm, const std::string& wt,
            const std::string& ang, double sz)
        : name (nm), weight (wt), angle (ang), size (sz)
      { }

      font (const font& ft)
        : name (ft.name), weight (ft.weight), angle (ft.angle),
          size (ft.size)
      { }

      ~font (void) { }

      font& operator = (const font& ft)
      {
        if (&ft != this)
          {
            name = ft.name;
            weight = ft.weight;
            angle = ft.angle;
            size = ft.size;
          }

        return *this;
      }

      std::string get_name (void) const { return name; }

      std::string get_weight (void) const { return weight; }

      std::string get_angle (void) const { return angle; }

      double get_size (void) const { return size; }

    protected:

      std::string name;
      std::string weight;
      std::string angle;
      double size;
    };

    // Container for substrings after parsing.

    class string
    {
    public:

      string (const std::string& s, font& f, const double x0, const double y0)
        : str (s), fnt (f), x (x0), y (y0), z (0.0), code (0),
          color (Matrix (1,3,0.0))
      { }

      string (const string& s)
        : str (s.str), fnt (s.fnt), x (s.x), y (s.y), code (s.code),
          color (s.color)
      { }

      ~string (void) { }

      string& operator = (const string& s)
      {
        if (&s != this)
          {
            str = s.str;
            fnt = s.fnt;
            x = s.x;
            y = s.y;
            code = s.code;
            color = s.color;
          }

        return *this;
      }

      void set_string (const std::string& s) { str = s; }

      std::string get_string (void) const { return str; }

      std::string get_name (void) const { return fnt.get_name (); }

      std::string get_weight (void) const { return fnt.get_weight (); }

      std::string get_angle (void) const { return fnt.get_angle (); }

      double get_size (void) const { return fnt.get_size (); }

      void set_x (const double x0) { x = x0; }

      double get_x (void) const { return x; }

      void set_y (const double y0) { y = y0; }

      double get_y (void) const { return y; }

      void set_z (const double z0) { z = z0; }

      double get_z (void) const { return z; }

      void set_code (const uint32_t c) { code = c; }

      uint32_t get_code (void) const { return code; }

      void set_color (const uint8NDArray& c)
      {
        color(0) = static_cast<double> (c(0)) / 255;
        color(1) = static_cast<double> (c(1)) / 255;
        color(2) = static_cast<double> (c(2)) / 255;
      }

      Matrix get_color (void) const { return color; }

    private:

      std::string str;
      font fnt;
      double x, y, z;
      uint32_t code;
      Matrix color;
    };

    void text_to_strlist (const std::string& txt,
                          std::list<string>& lst, Matrix& box,
                          int halign, int valign, double rotation = 0.0,
                          const caseless_str& interpreter = "tex");

  private:

    base_text_renderer *rep;

    // No copying!

    text_renderer (const text_renderer&);

    text_renderer& operator = (const text_renderer&);
  };
}

#endif