FontObject.h   [plain text]

/***************************************************************************
*
*   Copyright (C) 1998-2002, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
************************************************************************/


#ifndef __FONTOBJECT_H
#define __FONTOBJECT_H

#include <stdio.h>

#include "LETypes.h"


#ifndef ANY_NUMBER
#define ANY_NUMBER 1
#endif

struct DirectoryEntry
{
    le_uint32   tag;
    le_uint32   checksum;
    le_uint32   offset;
    le_uint32   length;
};

struct SFNTDirectory
{
    le_uint32       scalerType;
    le_uint16       numTables;
    le_uint16       searchRange;
    le_uint16       entrySelector;
    le_uint16       rangeShift;
    DirectoryEntry  tableDirectory[ANY_NUMBER];
};


struct CMAPEncodingSubtableHeader
{
    le_uint16   platformID;
    le_uint16   platformSpecificID;
    le_uint32   encodingOffset;
};

struct CMAPTable
{
    le_uint16   version;
    le_uint16   numberSubtables;
    CMAPEncodingSubtableHeader encodingSubtableHeaders[ANY_NUMBER];
};

struct CMAPEncodingSubtable
{
    le_uint16   format;
    le_uint16   length;
    le_uint16   language;
};

struct CMAPFormat0Encoding : CMAPEncodingSubtable
{
    le_uint8    glyphIndexArray[256];
};

struct CMAPFormat2Subheader
{
    le_uint16   firstCode;
    le_uint16   entryCount;
    le_int16    idDelta;
    le_uint16   idRangeOffset;
};

struct CMAPFormat2Encoding : CMAPEncodingSubtable
{
    le_uint16  subHeadKeys[256];
    CMAPFormat2Subheader subheaders[ANY_NUMBER];
};

struct CMAPFormat4Encoding : CMAPEncodingSubtable
{
    le_uint16   segCountX2;
    le_uint16   searchRange;
    le_uint16   entrySelector;
    le_uint16   rangeShift;
    le_uint16   endCodes[ANY_NUMBER];
//  le_uint16   reservedPad;
//  le_uint16   startCodes[ANY_NUMBER];
//  le_uint16   idDelta[ANY_NUMBER];
//  le_uint16   idRangeOffset[ANY_NUMBER];
//  le_uint16   glyphIndexArray[ANY_NUMBER];
};

struct CMAPFormat6Encoding : CMAPEncodingSubtable
{
    le_uint16   firstCode;
    le_uint16   entryCount;
    le_uint16   glyphIndexArray[ANY_NUMBER];
};

typedef le_int32 fixed;

struct BigDate
{
    le_uint32 bc;
    le_uint32 ad;
};

struct HEADTable
{
    fixed       version;
    fixed       fontRevision;
    le_uint32   checksumAdjustment;
    le_uint32   magicNumber;
    le_uint16   flags;
    le_uint16   unitsPerEm;
    BigDate     created;
    BigDate     modified;
    le_int16    xMin;
    le_int16    yMin;
    le_int16    xMax;
    le_int16    yMax;
    le_int16    lowestRecPPEM;
    le_int16    fontDirectionHint;
    le_int16    indexToLocFormat;
    le_int16    glyphDataFormat;
};

struct MAXPTable
{
    fixed       version;
    le_uint16   numGlyphs;
    le_uint16   maxPoints;
    le_uint16   maxContours;
    le_uint16   maxComponentPoints;
    le_uint16   maxComponentContours;
    le_uint16   maxZones;
    le_uint16   maxTwilightPoints;
    le_uint16   maxStorage;
    le_uint16   maxFunctionDefs;
    le_uint16   maxInstructionDefs;
    le_uint16   maxStackElements;
    le_uint16   maxSizeOfInstructions;
    le_uint16   maxComponentElements;
    le_uint16   maxComponentDepth;
};

struct HHEATable
{
    fixed       version;
    le_int16    ascent;
    le_int16    descent;
    le_int16    lineGap;
    le_uint16   advanceWidthMax;
    le_int16    minLeftSideBearing;
    le_int16    minRightSideBearing;
    le_int16    xMaxExtent;
    le_int16    caretSlopeRise;
    le_int16    caretSlopeRun;
    le_int16    caretOffset;
    le_int16    reserved1;
    le_int16    reserved2;
    le_int16    reserved3;
    le_int16    reserved4;
    le_int16    metricDataFormat;
    le_uint16   numOfLongHorMetrics;
};

struct LongHorMetric
{
    le_uint16   advanceWidth;
    le_int16    leftSideBearing;
};

struct HMTXTable
{
    LongHorMetric hMetrics[ANY_NUMBER];        // ANY_NUMBER = numOfLongHorMetrics from hhea table
//  le_int16      leftSideBearing[ANY_NUMBER]; // ANY_NUMBER = numGlyphs - numOfLongHorMetrics
};

class FontObject
{
public:
    FontObject(char *fontName);
    ~FontObject();

    void *readTable(LETag tag, le_uint32 *length);
    void deleteTable(void *table);

    LEGlyphID unicodeToGlyph(LEUnicode32 unicode);

#if 0
    le_uint32 unicodesToGlyphs(LEUnicode *chars, le_uint32 nChars, LEGlyphID *glyphs,
        le_uint32 *charIndices, le_bool rightToLeft);
#endif

    le_uint16 getUnitsPerEM();

    le_uint16 getGlyphAdvance(LEGlyphID glyph);

private:
    FontObject();

    DirectoryEntry *findTable(LETag tag);
    CMAPEncodingSubtable *findCMAP(le_uint16 platformID, le_uint16 platformSpecificID);
    void initUnicodeCMAP();

    SFNTDirectory *directory;
    le_uint16 numTables;
    le_uint16 searchRange;
    le_uint16 entrySelector;
    le_uint16 rangeShift;

    CMAPTable *cmapTable;
    le_uint16 cmSegCount;
    le_uint16 cmSearchRange;
    le_uint16 cmEntrySelector;
    le_uint16 cmRangeShift;
    le_uint16 *cmEndCodes;
    le_uint16 *cmStartCodes;
    le_uint16 *cmIdDelta;
    le_uint16 *cmIdRangeOffset;

    HEADTable *headTable;

    HMTXTable *hmtxTable;
    le_uint16 numGlyphs;
    le_uint16 numOfLongHorMetrics;

    FILE *file;

};

#endif