/*
 * Copyright (c) Hisilicon Technologies Co., Ltd. 2019-2020. All rights reserved.
 * Description: Draw text
 * Author:
 * Create: 2019-08-23
 */

#ifndef OSD_TEXT_H
#define OSD_TEXT_H

#include <memory>
#include "FontAtlas.h"
#include "FontStyleAtlas.h"
#include "Common.h"
#include "ShaderProgram.h"

namespace dolgles {
constexpr EGL_U32 FONT_STANDARD_WIDTH = 30;
constexpr EGL_U32 FONT_STANDARD_HEIGHT = FONTSIZE_STANDARD + 10;

class OSDText {
public:
    OSDText();
    ~OSDText();
    EGL_S32 Init();
    EGL_S32 DrawText(const FrameBuffObject &fbo, const GLTextInfo &textInfo, GLfloat x, GLfloat y);
    EGL_S32 GetTextSize(const GLTextInfo &textInfo, EGL_U32 &width, EGL_U32 &height) const;
    EGL_S32 LoadFont(const std::string &fontLibPath, EGL_U32 fontSize);

private:
    bool IsDrawStandardFont(const GLTextInfo &textInfo) const;
    void GLDrawText(const std::u16string &text, EGL_U32 textLen, GLfloat x, GLfloat y);
    void RenderText(const std::u16string &text, EGL_U32 textLen, GLfloat x, GLfloat y);
    EGL_S32 GetFontTex(const FrameBuffObject &fbo, const GLTextInfo &textInfo);
    bool FindCharFromMap(EGL_CHAR16 ch) const;

    std::unique_ptr<FontAtlas> fontAtlas = nullptr;
    std::unique_ptr<FontStyleAtlas> fontStyleAtlas = nullptr;
    std::unique_ptr<ShaderProgram> shaderProgram = nullptr;

    GLuint program;
    GLuint vbo;
    GLuint fontTex;
    GLuint texWidth;
    GLuint texHeight;
    GLint uniformTex;
    GLint attribCoord;
    GLint uniformColor;
    GLfloat scaleX;
    GLfloat scaleY;
    std::map<unsigned long, GlyphInfo> glyphsMap;
};
}; // namespace dolgles

#endif // end OSD_TEXT_H