/**
 * Created by G-Canvas Open Source Team.
 * Copyright (c) 2017, Alibaba, Inc. All rights reserved.
 *
 * This source code is licensed under the Apache Licence 2.0.
 * For the full copyright and license information, please view
 * the LICENSE file in the root directory of this source tree.
 */
#ifndef GCANVAS_GFONTMANAGER_H
#define GCANVAS_GFONTMANAGER_H

#include "GPoint.h"
#include "GTexture.h"
#include "GGlyphCache.h"
#include "GTreemap.h"
#include <map>
#include <string>
#include <vector>


class GCanvasContext;

#define FontTextureWidth        2048
#define FontTextureHeight       2048

namespace gcanvas
{
    class GFontStyle;
}


class GFontManager
{
public:

    static GFontManager *NewInstance(GCanvasContext *context);

    virtual  ~GFontManager() = default;


    virtual void DrawText(const unsigned short *text,
                          unsigned int text_length, float x, float y,
                          bool isStroke, gcanvas::GFontStyle *fontStyle)=0;

    virtual float MeasureText(const char *text,
                              unsigned int text_length, gcanvas::GFontStyle *fontStyle)=0;
    //measure ext
    virtual float* MeasureTextExt(const char *text,
                                  unsigned int text_length, gcanvas::GFontStyle *fontStyle)=0;
    //return float[4]，0：top，1：height，2：ascender，3：descender
    virtual float* PreMeasureTextHeight(const char *text,
                                  unsigned int text_length, gcanvas::GFontStyle *fontStyle) {
        float *ret = new float[4];
        return ret;
    }

protected:
    GFontManager(GCanvasContext *context) : mContext(context), mGlyphCache(context, *this),
                                            mTreemap(FontTextureWidth, FontTextureHeight) {};
public:
    GCanvasContext *mContext;
    GGlyphCache mGlyphCache;
    GTreemap mTreemap;
};

#endif /* GCANVAS_GFONTMANAGER_H */