FontRenderer.h

Go to the documentation of this file.

#pragma once
 
#include <string>
#include <vector>
#include <map>
#include <utility>
#include <memory>
 
#include "bmp.h"
#include "Vec2.h"
#include "GLTexture2D.h"
#include "GLArray.h"
#include "GLBuffer.h"
#include "Grid2D.h"


struct CharPosition {
  char c;         
  Vec2ui topLeft; 
  Vec2ui bottomRight; 
};

struct CharTex {
  GLTexture2D tex; 
  Mat4 scale;      
  Mat4 trans;      
  float width;     
  float height;    
};

enum class Alignment {
  Left,   
  Right,  
  Center  
};

class FontEngine {
public:
  FontEngine();
  virtual ~FontEngine() {}


  void render(const std::string& text, float winAspect, float height,
              const Vec2& pos, Alignment a = Alignment::Center, const Vec4& color=Vec4{1.0f,1.0f,1.0f,1.0f});
  void renderFixedWidth(const std::string& text, float winAspect, float width,
                        const Vec2& pos, Alignment a = Alignment::Center, const Vec4& color=Vec4{1.0f,1.0f,1.0f,1.0f});

  void render(uint32_t number, float winAspect, float height,
              const Vec2& pos, Alignment a = Alignment::Center, const Vec4& color=Vec4{1.0f,1.0f,1.0f,1.0f});
  void renderFixedWidth(uint32_t number, float winAspect, float width,
                        const Vec2& pos, Alignment a = Alignment::Center, const Vec4& color=Vec4{1.0f,1.0f,1.0f,1.0f});


  Vec2 getSize(const std::string& text, float winAspect, float height) const;
  Vec2 getSizeFixedWidth(const std::string& text, float winAspect, float width) const;
  Vec2 getSize(uint32_t number, float winAspect, float height) const;
  Vec2 getSizeFixedWidth(uint32_t number, float winAspect, float width) const;

  std::string getAllCharsString() const;
 
  std::map<char,CharTex> chars;  
  std::map<char,CharTex> sdChars;

  void setRenderAsSignedDistanceField(bool renderAsSignedDistanceField) {
    this->renderAsSignedDistanceField = renderAsSignedDistanceField;
  }

  bool getRenderAsSignedDistanceField() const {
    return renderAsSignedDistanceField;
  }
 
private:
  GLProgram simpleProg;   
  GLProgram simpleDistProg; 
  GLArray   simpleArray;  
  GLBuffer  simpleVb;     
  bool renderAsSignedDistanceField; 
};

class FontRenderer {
public:
  FontRenderer(const std::string& imageFilename,
               const std::string& positionFilename);

  FontRenderer(const Image& fontImage,
               const std::string& positionFilename);

  FontRenderer(const Image& fontImage,
               const std::vector<CharPosition>& positions);

  Image render(const std::string& text) const;
  Image render(uint32_t number) const;

  static const std::vector<CharPosition> loadPositions(const std::string& positionFilename);

  std::string toCode(const std::string& varName) const;

  std::shared_ptr<FontEngine> generateFontEngine() const;
 
private:
  Image fontImage;                         
  std::vector<CharPosition> positions;     

  const CharPosition& findElement(char c) const;
};