BackendFont.hpp

 
//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2022 Bruno Van de Velde (vdv_b@tgui.eu)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
//    you must not claim that you wrote the original software.
//    If you use this software in a product, an acknowledgment
//    in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
//    and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
 
 
#ifndef TGUI_BACKEND_FONT_HPP
#define TGUI_BACKEND_FONT_HPP
 
#include <TGUI/Font.hpp>
#include <TGUI/String.hpp>
#include <TGUI/Global.hpp>
#include <TGUI/Backend/Renderer/BackendTexture.hpp>
#include <cstdint>
 
 
namespace tgui
{
    class TGUI_API BackendFont
    {
    public:
 
        virtual ~BackendFont() = default;
 
 
        virtual bool loadFromFile(const String& filename);
 
 
        virtual bool loadFromMemory(std::unique_ptr<std::uint8_t[]> data, std::size_t sizeInBytes) = 0;
 
 
        bool loadFromMemory(const void* data, std::size_t sizeInBytes);
 
 
        virtual bool hasGlyph(char32_t codePoint) const = 0;
 
 
        virtual FontGlyph getGlyph(char32_t codePoint, unsigned int characterSize, bool bold, float outlineThickness = 0) = 0;
 
 
        virtual float getKerning(char32_t first, char32_t second, unsigned int characterSize, bool bold) = 0;
 
 
        virtual float getLineSpacing(unsigned int characterSize) = 0;
 
 
        virtual float getUnderlinePosition(unsigned int characterSize) = 0;
 
 
        virtual float getUnderlineThickness(unsigned int characterSize) = 0;
 
 
        virtual std::shared_ptr<BackendTexture> getTexture(unsigned int characterSize) = 0;
 
 
        virtual void setSmooth(bool smooth);
 
 
        bool isSmooth() const;
 
 
    protected:
 
 
        std::uint64_t constructGlyphKey(char32_t codePoint, unsigned int characterSize, bool bold, float outlineThickness);
 
 
    protected:
 
        bool m_isSmooth = true;
    };
}
 
 
#endif // TGUI_BACKEND_FONT_HPP