text-renderer.cc

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2009-2025 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.
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// 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
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////////////////////////////////////////////////////////////////////////
 
#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif
 
#include "base-text-renderer.h"
#include "error.h"
#include "errwarn.h"
#include "ft-text-renderer.h"
#include "latex-text-renderer.h"
#include "text-renderer.h"
 
OCTAVE_BEGIN_NAMESPACE(octave)
 
text_renderer::text_renderer ()
  : m_rep (make_ft_text_renderer ()),
    m_latex_rep (make_latex_text_renderer ())
{ }
 
text_renderer::~text_renderer ()
{
  delete m_rep;
  delete m_latex_rep;
}
 
bool
text_renderer::ok () const
{
  static bool warned = false;
 
  if (! m_rep)
    {
      if (! warned)
        {
          warn_disabled_feature ("opengl_renderer::render_text",
                                 "rendering text (FreeType)");
 
          warned = true;
        }
    }
 
  return m_rep != nullptr;
}
 
Matrix
text_renderer::get_extent (text_element *elt, double rotation)
{
  static Matrix empty_extent (1, 4, 0.0);
 
  return ok () ? m_rep->get_extent (elt, rotation) : empty_extent;
}
 
Matrix
text_renderer::get_extent (const std::string& txt, double rotation,
                           const caseless_str& interpreter)
{
  static Matrix retval (1, 4, 0.0);
 
  if (interpreter == "latex" && m_latex_rep->ok ())
    retval = m_latex_rep->get_extent (txt, rotation, interpreter);
  else if (ok ())
    retval = m_rep->get_extent (txt, rotation, interpreter);
 
  return retval;
}
 
void
text_renderer::set_anti_aliasing (bool val)
{
  if (ok ())
    m_rep->set_anti_aliasing (val);
}
 
octave_map
text_renderer::get_system_fonts ()
{
  octave_map retval;
 
  if (ok ())
    retval = m_rep->get_system_fonts ();
 
  return retval;
}
 
void
text_renderer::set_font (const std::string& name, const std::string& weight,
                         const std::string& angle, double size)
{
  if (ok ())
    {
      m_rep->set_font (name, weight, angle, size);
      m_latex_rep->set_font (name, weight, angle, size);
    }
}
 
void
text_renderer::set_color (const Matrix& c)
{
  if (ok ())
    {
      m_rep->set_color (c);
      m_latex_rep->set_color (c);
    }
}
 
void
text_renderer::text_to_pixels (const std::string& txt,
                               uint8NDArray& pxls, Matrix& bbox,
                               int halign, int valign, double rotation,
                               const caseless_str& interpreter,
                               bool handle_rotation)
{
  static Matrix empty_bbox (1, 4, 0.0);
  static uint8NDArray empty_pxls;
 
  if (interpreter == "latex" && m_latex_rep->ok ())
    m_latex_rep->text_to_pixels (txt, pxls, bbox, halign, valign, rotation,
                                 interpreter, handle_rotation);
  else if (ok ())
    m_rep->text_to_pixels (txt, pxls, bbox, halign, valign, rotation,
                           interpreter, handle_rotation);
  else
    {
      bbox = empty_bbox;
      pxls = empty_pxls;
    }
}
 
void
text_renderer::text_to_strlist (const std::string& txt,
                                std::list<text_renderer::string>& lst,
                                Matrix& bbox, int halign, int valign,
                                double rotation,
                                const caseless_str& interpreter)
{
  static Matrix empty_bbox (1, 4, 0.0);
  static std::list<text_renderer::string> empty_lst;
 
  if (interpreter == "latex" && m_latex_rep->ok ())
    m_latex_rep->text_to_strlist (txt, lst, bbox, halign, valign, rotation,
                                  interpreter);
  else if (ok ())
    m_rep->text_to_strlist (txt, lst, bbox, halign, valign, rotation,
                            interpreter);
  else
    {
      bbox = empty_bbox;
      lst = empty_lst;
    }
}
 
OCTAVE_END_NAMESPACE(octave)