晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/*
 *******************************************************************************
 *
 *   © 2016 and later: Unicode, Inc. and others.
 *   License & terms of use: http://www.unicode.org/copyright.html#License
 *
 *******************************************************************************
 *******************************************************************************
 *
 *   Copyright (C) 1999-2006, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  GnomeFontInstance.h
 *
 *   created on: 08/30/2001
 *   created by: Eric R. Mader
 */

#ifndef __GNOMEFONTINSTANCE_H
#define __GNOMEFONTINSTANCE_H

#include <gnome.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include <cairo.h>

#include "layout/LETypes.h"
#include "layout/LEFontInstance.h"

#include "RenderingSurface.h"
#include "FontTableCache.h"
#include "cmaps.h"

class GnomeSurface : public RenderingSurface
{
public:
    GnomeSurface(GtkWidget *theWidget);
    virtual ~GnomeSurface();

    virtual void drawGlyphs(const LEFontInstance *font, const LEGlyphID *glyphs, le_int32 count,
        const float *positions, le_int32 x, le_int32 y, le_int32 width, le_int32 height);

    GtkWidget *getWidget() const;
    void setWidget(GtkWidget *theWidget);

private:
    GtkWidget *fWidget;
    cairo_t   *fCairo;
};

class GnomeFontInstance : public LEFontInstance, protected FontTableCache
{
 protected:
    FT_Face fFace;
//  FT_Glyph fGlyph;
    
    cairo_font_face_t *fCairoFace;

    le_int32 fPointSize;
    le_int32 fUnitsPerEM;
    le_int32 fAscent;
    le_int32 fDescent;
    le_int32 fLeading;

    float fDeviceScaleX;
    float fDeviceScaleY;

    CMAPMapper *fMapper;

    virtual const void *readFontTable(LETag tableTag) const;

    virtual LEErrorCode initMapper();

 public:
    GnomeFontInstance(FT_Library engine, const char *fontPathName, le_int16 pointSize, LEErrorCode &status);

    virtual ~GnomeFontInstance();

    virtual const void *getFontTable(LETag tableTag) const;

    virtual le_int32 getUnitsPerEM() const;

    virtual le_int32 getAscent() const;

    virtual le_int32 getDescent() const;

    virtual le_int32 getLeading() const;

    virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch) const;

    virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;

    virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;

    float getXPixelsPerEm() const;

    float getYPixelsPerEm() const;

    float getScaleFactorX() const;

    float getScaleFactorY() const;

    void rasterizeGlyphs(cairo_t *cairo, const LEGlyphID *glyphs, le_int32 glyphCount, const float *positions,
				   le_int32 x, le_int32 y) const;
};

inline GtkWidget *GnomeSurface::getWidget() const
{
    return fWidget;
}

inline void GnomeSurface::setWidget(GtkWidget *theWidget)
{
    fWidget = theWidget;
}

/*
inline FT_Instance GnomeFontInstance::getFont() const
{
    return fInstance;
}
*/

inline le_int32 GnomeFontInstance::getUnitsPerEM() const
{
    return fUnitsPerEM;
}

inline le_int32 GnomeFontInstance::getAscent() const
{
    return fAscent;
}

inline le_int32 GnomeFontInstance::getDescent() const
{
    return fDescent;
}

inline le_int32 GnomeFontInstance::getLeading() const
{
    return fLeading;
}

inline LEGlyphID GnomeFontInstance::mapCharToGlyph(LEUnicode32 ch) const
{
    return fMapper->unicodeToGlyph(ch);
}

inline float GnomeFontInstance::getXPixelsPerEm() const
{
    return (float) fPointSize;
}

inline float GnomeFontInstance::getYPixelsPerEm() const
{
    return  (float) fPointSize;
}

inline float GnomeFontInstance::getScaleFactorX() const
{
    return fDeviceScaleX;
}

inline float GnomeFontInstance::getScaleFactorY() const
{
    return fDeviceScaleY;
}

#endif