ttf.h

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#ifndef __TTF_H__
#define __TTF_H__
 
#include <stdint.h>
#include <_xeneva.h>
#include "font.h"
#include "chitralekha.h"
 
/* ttf table tags */
#define TTF_TABLE_CMAP  'cmap' //character to glyph mapping
#define TTF_TABLE_GLYF  'glyf' //glyph data
#define TTF_TABLE_HEAD  'head' //font header
#define TTF_TABLE_HHEA  'hhea' //horizontal header
#define TTF_TABLE_HMTX  'hmtx' //horizontal metrics
#define TTF_TABLE_LOCA  'loca' //index to location
#define TTF_TABLE_MAXP  'maxp' //maximum profile
#define TTF_TABLE_NAME  'name' //naming
#define TTF_TABLE_POST  'post' //PostScript
 
/* true type --data type definitions*/
typedef int16_t shortFrac;
typedef int32_t Fixed;
typedef int16_t FWord;
typedef uint16_t uFWord;
typedef int16_t F2Dot14;
typedef uint64_t longDateTime;
 
#pragma pack(push,1)
typedef struct _ttftable_ {
    unsigned char* base;
    unsigned int len;
}TTFTable;
#pragma pack(pop)
 
typedef struct _ttf_ {
    unsigned char* base;
    TTFTable cmap;
    TTFTable glyf;
    TTFTable head;
    TTFTable hhea;
    TTFTable hmtx;
    TTFTable loca;
    TTFTable maxp;
    TTFTable name;
    TTFTable post;
    uint16_t unitsPerEm;
    unsigned char* cmapStart;
    uint16_t loca_type;
    unsigned char* memptr;
    float scale;
    ChCanvas* canv;
}TTFont;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _off_sub_ {
    uint32_t scalerType;
    uint16_t numTables;
    uint16_t searchRange;
    uint16_t entrySelector;
    uint16_t rangeShift;
}TTFOffsetSubtable;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _table_dir_ {
    uint32_t tag;
    uint32_t checksum;
    uint32_t offset;
    uint32_t length;
}TTFTableDirectory;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _head_tbl_ {
    Fixed version;
    Fixed fontRevision;
    uint32_t checkSumAdjustment;
    uint32_t magicNumber;
    uint16_t flags;
    uint16_t unitsPerEm;
    longDateTime created;
    longDateTime modified;
    FWord xMin;
    FWord yMin;
    FWord xMax;
    FWord yMax;
    uint16_t macStyle;
    uint16_t lowestRecPPEM;
    int16_t fontDirectionHint;
    int16_t indexToLocFormat;
    int16_t glyphDataFormat;
}TTFHead;
#pragma pack(pop)
 
#pragma pack(push,1)
/* CMAP Tables */
typedef struct _ttf_cmap_ {
    uint16_t version;
    uint16_t numberSubtable;
}TTFCmap;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _ttf_cmap_sub_ {
    uint16_t platformID;
    uint16_t platformSpecificID;
    uint32_t offset;
}TTFCmapSubtable;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _cmap_format_ {
    uint16_t format;
    uint16_t len;
    uint16_t language;
}TTFCmapFormat;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _cmap_format12_ {
    uint16_t format;
    uint16_t reserved;
    uint32_t len;
    uint32_t language;
    uint32_t nGroups;
}TTFCmapFormat12;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _cmap_format12_grp_ {
    uint32_t startCharCode;
    uint32_t endCharCode;
    uint32_t startGlyphCode;
}TTFCmapFormat12Group;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _cmap_format4_ {
    uint16_t format;
    uint16_t len;
    uint16_t language;
    uint16_t segCountX2;
    uint16_t searchRange;
    uint16_t entrySelector;
    //uint16_t rangeShift;
}TTFCmapFormat4;
#pragma pack(pop)
 
#pragma pack(push,1)
typedef struct _maxp_ {
    Fixed version;
    uint16_t numGlyphs;
    uint16_t maxPoints;
    uint16_t maxContours;
    uint16_t maxComponentPoints;
    uint16_t maxComponentContours;
    uint16_t maxZones;
    uint16_t maxTwilightPoints;
    uint16_t maxStorage;
    uint16_t maxFunctionDefs;
    uint16_t maxInstructionDefs;
    uint16_t maxStackElements;
    uint16_t maxSizeOfInstructions;
    uint16_t maxComponentElements;
    uint16_t maxComponentDepth;
}TTFMaxp;
 
 
typedef struct _glyph_desc_ {
    int16_t numContours;
    FWord xMin;
    FWord yMin;
    FWord xMax;
    FWord yMax;
}TTFGlyphDesc;
 
#pragma pack(pop)
 
 
 
/*
* TTFLoadFont -- load and start decoding ttf font
* @param buffer -- pointer to font file buffer
*/
TTFont* TTFLoadFont(ChCanvas* canv,unsigned char* buffer);
 
/*
* TTFSetFontSize -- scale font for output on display device
* @param font -- Pointer to font object
* @param pointSz -- size of the point
*/
void TTFSetFontSize(TTFont * font, float pointSz);
#endif