GLFontFreeType.h

#pragma once

#include "GLType.h"
#include "GLFont.h"

#include <string>

#include "ft2build.h"
#include FT_FREETYPE_H
#include FT_STROKER_H
#include FT_IMAGE_H


namespace ParaEngine
{

    class FontFreeType : public Font
    {
    public:
        static const int DistanceMapSpread;

        static FontFreeType* create(const std::string &fontName, float fontSize, GlyphCollection glyphs,
            const char *customGlyphs, bool distanceFieldEnabled = false, int outline = 0);

        static void shutdownFreeType();
        static void shutdownFreeType_exit();

        bool isDistanceFieldEnabled() const { return _distanceFieldEnabled; }

        float getOutlineSize() const { return _outlineSize; }

        void renderCharAt(unsigned char *dest, int posX, int posY, unsigned char* bitmap, long bitmapWidth, long bitmapHeight);

        FT_Encoding getEncoding() const { return _encoding; }

        int* getHorizontalKerningForTextUTF16(const std::u16string& text, int &outNumLetters) const override;

        unsigned char* getGlyphBitmap(unsigned short theChar, long &outWidth, long &outHeight, CCRect &outRect, int &xAdvance);

        int getFontAscender() const;
        const char* getFontFamily() const;

        virtual FontAtlas* createFontAtlas() override;
        virtual int getFontMaxHeight() const override { return _lineHeight; }

        static void releaseFont(const std::string &fontName);

    private:
        static const char* _glyphASCII;
        static const char* _glyphNEHE;
        static FT_Library _FTlibrary;
        static bool _FTInitialized;

        FontFreeType(bool distanceFieldEnabled = false, int outline = 0);
        virtual ~FontFreeType();

        bool createFontObject(const std::string &fontName, float fontSize);

        bool initFreeType();
        FT_Library getFTLibrary();

        int getHorizontalKerningForChars(unsigned short firstChar, unsigned short secondChar) const;
        unsigned char* getGlyphBitmapWithOutline(unsigned short code, FT_BBox &bbox);

        void setGlyphCollection(GlyphCollection glyphs, const char* customGlyphs = nullptr);
        const char* getGlyphCollection() const;

        FT_Face _fontRef;
        FT_Stroker _stroker;
        FT_Encoding _encoding;

        std::string _fontName;
        bool _distanceFieldEnabled;
        float _outlineSize;
        int _lineHeight;
        FontAtlas* _fontAtlas;

        GlyphCollection _usedGlyphs;
        std::string _customGlyphs;
    };
}