FontRenderabilityCache.h

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// -*- mode: c++; c-file-style: "linux"; c-basic-offset: 2; indent-tabs-mode: nil -*-
//
//  Copyright (C) 2026 Gunter Königsmann <wxMaxima@physikbuch.de>
//
//  This program 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 2 of the License, or
//  (at your option) any later version.
//
//  This program 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 this program; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//  SPDX-License-Identifier: GPL-2.0+
 
#ifndef FONTRENDERABILITYCACHE_H
#define FONTRENDERABILITYCACHE_H
 
#include <wx/confbase.h>
#include <wx/font.h>
#include <wx/hashmap.h>
#include <wx/string.h>
#include <unordered_map>
 
class FontRenderabilityCache
{
public:
  bool FontRendersChar(wxUniChar ch, const wxFont &font);
 
  void ClearValues();
 
  void ReadFrom(wxConfigBase *config);
  void WriteTo(wxConfigBase *config) const;
 
private:
  using RenderableCharsHash =
    std::unordered_map<wxString, wxString, wxStringHash>;
 
  static bool FontDisplaysChar(wxUniChar ch, const wxFont &font);
  static bool CharVisiblyDifferent(wxChar ch, wxChar otherChar,
                                   const wxFont &font);
 
  RenderableCharsHash m_renderableChars;
  RenderableCharsHash m_nonRenderableChars;
};
 
#endif // FONTRENDERABILITYCACHE_H