/*
 * Copyright (c) Hisilicon Technologies Co., Ltd. 2019-2020. All rights reserved.
 * Description: Font atlas
 * Author:
 * Create: 2019-08-09
 */

#ifndef FONT_ATLAS_H
#define FONT_ATLAS_H

#include <map>
#include "Common.h"

namespace dolgles {
class FontAtlas {
public:
    FontAtlas();
    ~FontAtlas();
    EGL_S32 LoadFontByPath(const std::string &fontLibPath, FT_UInt resolution);
    GLuint GetFontTexture() const;
    const std::map<unsigned long, GlyphInfo> &GetGlyphs() const;
    GLuint GetFontTextureWidth() const;
    GLuint GetFontTextureHeight() const;
private:
    EGL_S32 CreateAtlasTex();
    EGL_S32 CalculateTexSize(const FT_Face fontFace);
    void FontCharInfoToMap(FT_GlyphSlot glyph, int offsetX, int offsetY, FT_ULong charcode);
    void FontToTexture(const FT_Face fontFace);
    EGL_S32 LoadFont(const FT_Face fontFace, FT_UInt resolution);
    void DeleteTexture();

    GLuint texture;
    GLuint texWidth;
    GLuint texHeight;
    std::map<unsigned long, GlyphInfo> glyphs;
};
}; // namespace dolgles

#endif // end FONT_ATLAS_H