/*
 * Copyright (c) Hisilicon Technologies Co., Ltd. 2019-2020. All rights reserved.
 * Description: Font style atlas
 * Author:
 * Create: 2019-08-22
 */

#ifndef FONT_STYLE_ATLAS_H
#define FONT_STYLE_ATLAS_H

#include "Common.h"
#include <map>
#include <freetype/ftglyph.h>

namespace dolgles {
class FontStyleAtlas {
public:
    FontStyleAtlas();
    ~FontStyleAtlas();
    EGL_S32 GetFontTexture(const GLTextInfo &textInfo, GLuint &styleTex);
    EGL_S32 LoadFontByPath(const std::string &fontLibPath);
    const std::map<unsigned long, GlyphInfo> &GetGlyphs() const;
    void GetFontGlyphs(const GLTextInfo &textInfo, std::map<unsigned long, GlyphInfo> &glyphsMap) const;
    GLuint GetFontTextureWidth() const;
    GLuint GetFontTextureHeight() const;
private:
    void SetFontStyleAtlas(const GLTextInfo &textInfo, FT_Face face) const;
    EGL_S32 CreateStyleTex();
    EGL_S32 CalculateTexSize(const GLTextInfo &textInfo);
    void FontCharInfoToMap(FT_GlyphSlot glyph, int offsetX, int offsetY, FT_ULong charcode);
    void FontToTexture(const GLTextInfo &textInfo);
    void DeleteTexture();

    FT_Face fontFaceForTextSize;
    FT_Face fontFace;
    FT_Library library;

    GLuint texture;
    GLuint texWidth;
    GLuint texHeight;

    std::map<unsigned long, GlyphInfo> glyphs;
};
}; // namespace dolgles

#endif // end FONT_STYLE_ATLAS_H