/****************************************************************************\
 Part of the XeTeX typesetting system
 Copyright (c) 1994-2008 by SIL International
 Copyright (c) 2009, 2011 by Jonathan Kew

 SIL Author(s): Jonathan Kew

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/*
 *   file name:  XeTeXFontInst.h
 *
 *   created on: 2005-10-22
 *   created by: Jonathan Kew
 *
 *  originally based on PortableFontInstance.h from ICU
 */

#ifndef __XeTeXFontInst_H
#define __XeTeXFontInst_H

#include "tectonic_bridge_core.h"
#include "xetex-XeTeXFontMgr.h"

#include <ft2build.h>
#include FT_GLYPH_H
#include FT_ADVANCES_H
#include FT_TRUETYPE_TABLES_H

#include <unicode/umachine.h>

static inline double
Fix2D(Fixed f)
{
    return f / 65536.0;
}

static inline Fixed
D2Fix(double d)
{
    return (int) (d * 65536.0 + 0.5);
}


// create specific subclasses for each supported platform

class XeTeXFontInst
{
protected:
    unsigned short m_unitsPerEM;
    float m_pointSize;
    float m_ascent;
    float m_descent;
    float m_capHeight;
    float m_xHeight;
    float m_italicAngle;

    bool m_vertical; // false = horizontal, true = vertical

    char *m_filename; // font filename
    uint32_t m_index; // face index

    FT_Face m_ftFace;
    FT_Byte *m_backingData, *m_backingData2;
    hb_font_t* m_hbFont;

public:
    XeTeXFontInst(float pointSize, int &status);
    XeTeXFontInst(const char* filename, int index, float pointSize, int &status);

    virtual ~XeTeXFontInst();

    void initialize(const char* pathname, int index, int &status);

    void *getFontTable(OTTag tableTag) const;
    void *getFontTable(FT_Sfnt_Tag tableTag) const;

    const char *getFilename(uint32_t* index) const
    {
        *index = m_index;
        return m_filename;
    }
    hb_font_t *getHbFont() const { return m_hbFont; }
    void setLayoutDirVertical(bool vertical);
    bool getLayoutDirVertical() const { return m_vertical; }

    float getPointSize() const { return m_pointSize; }
    float getAscent() const { return m_ascent; }
    float getDescent() const { return m_descent; }
    float getCapHeight() const { return m_capHeight; }
    float getXHeight() const { return m_xHeight; }
    float getItalicAngle() const { return m_italicAngle; }

    GlyphID mapCharToGlyph(UChar32 ch) const;
    GlyphID mapGlyphToIndex(const char* glyphName) const;

    uint16_t getNumGlyphs() const;

    void getGlyphBounds(GlyphID glyph, GlyphBBox* bbox);

    float getGlyphWidth(GlyphID glyph);
    void getGlyphHeightDepth(GlyphID glyph, float *ht, float* dp);
    void getGlyphSidebearings(GlyphID glyph, float* lsb, float* rsb);
    float getGlyphItalCorr(GlyphID glyph);

    const char* getGlyphName(GlyphID gid, int& nameLen);

    UChar32 getFirstCharCode();
    UChar32 getLastCharCode();

    /* Tectonic: these are modified from the base XeTeX code to use doubles;
     * otherwise roundoff errors can accumulate leading to differences in the
     * XDV outputs. */
    float unitsToPoints(double units) const
    {
        return (units * m_pointSize) / m_unitsPerEM;
    }

    float pointsToUnits(double points) const
    {
        return (points * m_unitsPerEM) / m_pointSize;
    }
};

#endif
