fontengine.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2010-2014 sapier <sapier at gmx dot net>
 
#pragma once
 
#include <map>
#include "util/basic_macros.h"
#include "irrlichttypes.h"
#include "irrString.h" // utf8_to_wide
#include "threading/mutex_auto_lock.h"
 
namespace irr {
        namespace gui {
                class IGUIEnvironment;
                class IGUIFont;
        }
}
 
#define FONT_SIZE_UNSPECIFIED 0xFFFFFFFF
 
enum FontMode : u8 {
        FM_Standard = 0,
        FM_Mono,
        _FM_Fallback, // do not use directly
        FM_MaxMode,
        FM_Unspecified
};
 
struct FontSpec {
        FontSpec(unsigned int font_size, FontMode mode, bool bold, bool italic) :
                size(font_size),
                mode(mode),
                bold(bold),
                italic(italic) {}
 
        u16 getHash() const
        {
                return (mode << 2) | (static_cast<u8>(bold) << 1) | static_cast<u8>(italic);
        }
 
        unsigned int size;
        FontMode mode;
        bool bold;
        bool italic;
};
 
class FontEngine
{
public:
 
        FontEngine(gui::IGUIEnvironment* env);
 
        ~FontEngine();
 
        // Get best possible font specified by FontSpec
        irr::gui::IGUIFont *getFont(FontSpec spec);
 
        irr::gui::IGUIFont *getFont(unsigned int font_size=FONT_SIZE_UNSPECIFIED,
                        FontMode mode=FM_Unspecified)
        {
                FontSpec spec(font_size, mode, m_default_bold, m_default_italic);
                return getFont(spec);
        }
 
        unsigned int getTextHeight(const FontSpec &spec);
 
        unsigned int getTextHeight(
                        unsigned int font_size=FONT_SIZE_UNSPECIFIED,
                        FontMode mode=FM_Unspecified)
        {
                FontSpec spec(font_size, mode, m_default_bold, m_default_italic);
                return getTextHeight(spec);
        }
 
        unsigned int getTextWidth(const std::wstring &text, const FontSpec &spec);
 
        unsigned int getTextWidth(const std::wstring& text,
                        unsigned int font_size=FONT_SIZE_UNSPECIFIED,
                        FontMode mode=FM_Unspecified)
        {
                FontSpec spec(font_size, mode, m_default_bold, m_default_italic);
                return getTextWidth(text, spec);
        }
 
        unsigned int getTextWidth(const std::string &text, const FontSpec &spec)
        {
                return getTextWidth(utf8_to_wide(text), spec);
        }
 
        unsigned int getTextWidth(const std::string& text,
                        unsigned int font_size=FONT_SIZE_UNSPECIFIED,
                        FontMode mode=FM_Unspecified)
        {
                FontSpec spec(font_size, mode, m_default_bold, m_default_italic);
                return getTextWidth(utf8_to_wide(text), spec);
        }
 
        unsigned int getLineHeight(const FontSpec &spec);
 
        unsigned int getLineHeight(unsigned int font_size=FONT_SIZE_UNSPECIFIED,
                        FontMode mode=FM_Unspecified)
        {
                FontSpec spec(font_size, mode, m_default_bold, m_default_italic);
                return getLineHeight(spec);
        }
 
        unsigned int getDefaultFontSize();
 
        unsigned int getFontSize(FontMode mode);
 
        void readSettings();
 
private:
        irr::gui::IGUIFont *getFont(FontSpec spec, bool may_fail);
 
        void updateFontCache();
 
        gui::IGUIFont *initFont(const FontSpec &spec);
 
        void updateSkin();
 
        void cleanCache();
 
        gui::IGUIEnvironment* m_env = nullptr;
 
        std::recursive_mutex m_font_mutex;
 
        std::map<unsigned int, irr::gui::IGUIFont*> m_font_cache[FM_MaxMode << 2];
 
        unsigned int m_default_size[FM_MaxMode];
 
        bool m_default_bold = false;
        bool m_default_italic = false;
 
        static const FontMode m_currentMode = FM_Standard;
 
        DISABLE_CLASS_COPY(FontEngine);
};
 
extern FontEngine* g_fontengine;