text_renderer.hpp

Go to the documentation of this file.

#pragma once
 
#include <iostream>
#include <vector>
#include <memory>
#include <cstdint>
#include <unordered_map>
 
#include <ft2build.h>
#include FT_FREETYPE_H
 
#include "../../types/types.hpp"
#include "../texture.hpp"
#include "../../util/color.hpp"
#include "../../shapes/shapes.hpp"
 
namespace cangine {
    struct Character {
        Texture texture;       
        int width;             
        int height;            
        int bearingX;          
        int bearingY;          
        unsigned int advance;  
    };
 
    struct Font {
        FT_Face face;                                    
        std::unordered_map<uint32_t, Character> glyphs;  
        int height;                                      
        std::string path;                                
 
        Font(FT_Face f, int h, const std::string& p)
            : face(f), height(h), path(p) {}
    };
 
    std::vector<uint32_t> utf8_to_codepoints(const std::string& str);
 
    class TextRenderer {
        private:
        static TextRenderer* instance; 
        FT_Library ft;                 
        bool init_freetype();
        std::unordered_map<std::string, std::unique_ptr<Font>> fonts; 
 
        public:
        bool valid; 
        void clearGlyphCache(Font* font);
        Font* loadFont(std::string path, int height = 40);
        void setFontHeight(Font* font, int heightIn);
        bool loadGlyph(Font* font, uint32_t cp);
        void renderText(Font* font, const std::string &text, Vector3 pos, float scale, const Color &color);
        Vector2 measureText(Font *font, const std::string &text, float scale);
        static TextRenderer* getInstance();
        TextRenderer();
        ~TextRenderer();
 
    };
}