base-text-renderer.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2009-2022 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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
// <https://www.gnu.org/licenses/>.
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////////////////////////////////////////////////////////////////////////
 
#if ! defined (octave_base_text_renderer_h)
#define octave_base_text_renderer_h 1
 
#include "octave-config.h"
 
#include <list>
#include <string>
 
#include "dMatrix.h"
#include "oct-map.h"
#include "uint8NDArray.h"
 
#include "text-engine.h"
#include "text-renderer.h"
 
namespace octave
{
  class
  base_text_renderer : public text_processor
  {
  public:
 
    enum
    {
      ROTATION_0   = 0,
      ROTATION_90  = 1,
      ROTATION_180 = 2,
      ROTATION_270 = 3
    };
 
    base_text_renderer (void) : text_processor () { }
 
    // No copying!
 
    base_text_renderer (const base_text_renderer&) = delete;
 
    base_text_renderer& operator = (const base_text_renderer&) = delete;
 
    virtual ~base_text_renderer (void) = default;
 
    virtual void
    set_anti_aliasing (bool val) = 0;
 
    virtual Matrix
    get_extent (text_element *elt, double rotation) = 0;
 
    virtual Matrix
    get_extent (const std::string& txt, double rotation,
                const caseless_str& interpreter) = 0;
 
    virtual void
    set_font (const std::string& name, const std::string& weight,
              const std::string& angle, double size) = 0;
 
    virtual bool
    ok (void) { return true; };
 
    virtual octave_map
    get_system_fonts (void) = 0;
 
    virtual void set_color (const Matrix& c) = 0;
 
    virtual void
    text_to_pixels (const std::string& txt, uint8NDArray& pxls,
                    Matrix& bbox, int halign, int valign, double rotation,
                    const caseless_str& interpreter,
                    bool handle_rotation) = 0;
 
    virtual void
    text_to_strlist (const std::string& txt,
                     std::list<text_renderer::string>& lst,
                     Matrix& box, int halign, int valign, double rotation,
                     const caseless_str& interpreter = "tex") = 0;
 
    void rotate_pixels (uint8NDArray& pixels, int rot_mode) const;
 
    int rotation_to_mode (double rotation) const;
 
    void fix_bbox_anchor (Matrix& bbox, int halign,
                          int valign, int rot_mode,
                          bool handle_rotation) const;
 
  };
}
 
#endif