305 lines
6.1 KiB
C
305 lines
6.1 KiB
C
|
/*
|
||
|
|
* TrueType File Format Structure Definitions
|
||
|
|
*
|
||
|
|
* Copyright (c) 1997-1999 Microsoft Corporation.
|
||
|
|
*/
|
||
|
|
/* Whole :
|
||
|
|
+-----------------------+
|
||
|
|
| Header |
|
||
|
|
+-----------------------+
|
||
|
|
| Tables |
|
||
|
|
| |
|
||
|
|
|
|
||
|
|
| |
|
||
|
|
+-----------------------+
|
||
|
|
Header :
|
||
|
|
----------------------------------------------------------
|
||
|
|
Fixed sfnt version 0x00010000
|
||
|
|
ushort numTables Number of tables
|
||
|
|
ushort searchRange (n^2 <= numtables)*16
|
||
|
|
ushort entrySelector Log2(n^2<=numTables)
|
||
|
|
ushort rangeShift NumTables*16-searchRange
|
||
|
|
Table Directory Entries
|
||
|
|
----------------------------------------------------------
|
||
|
|
Table Directory:
|
||
|
|
----------------------------------------------------------
|
||
|
|
ulong tag 4-byte idetifier
|
||
|
|
ulong checkSum CheckSum for this table
|
||
|
|
ulong offset offset from beginning of
|
||
|
|
TrueType font file
|
||
|
|
ulong length Length of this table
|
||
|
|
----------------------------------------------------------
|
||
|
|
|
||
|
|
Tables:
|
||
|
|
----------------------------------------------------------
|
||
|
|
cmap character to glyph mapping
|
||
|
|
glyf glyph data
|
||
|
|
head font header
|
||
|
|
hhea horizontal header
|
||
|
|
hmtx hosizontal metrics
|
||
|
|
loca index to location
|
||
|
|
maxp maximum profile
|
||
|
|
name naming table
|
||
|
|
post PostScript information
|
||
|
|
OS/2 OS/2 and Windows specific metrics
|
||
|
|
--------------------------
|
||
|
|
cvt Control Value Table
|
||
|
|
fpgm font program
|
||
|
|
hdmx hosizontal device metrics
|
||
|
|
kern kerning
|
||
|
|
LTSH Linear threshold table
|
||
|
|
prep CVT Program
|
||
|
|
WIN (reserved)
|
||
|
|
VDMX Vertical Device Metrics table
|
||
|
|
FOCA Reserved for IBM Font Object Content Architecture data
|
||
|
|
PCLT PCL 5 table
|
||
|
|
mort glyph metamorphosis table
|
||
|
|
--------------------------
|
||
|
|
vhea Vertical Header table
|
||
|
|
vmtx Vertical metrics table
|
||
|
|
----------------------------------------------------------
|
||
|
|
*/
|
||
|
|
#define TAGSIZ 4
|
||
|
|
struct TTFHeader {
|
||
|
|
char sfnt_version[4];
|
||
|
|
short numTables;
|
||
|
|
short searchRange;
|
||
|
|
short entrySelector;
|
||
|
|
short rangeShift;
|
||
|
|
};
|
||
|
|
struct TableEntry {
|
||
|
|
char tagName[TAGSIZ];
|
||
|
|
unsigned long checkSum;
|
||
|
|
long ofs;
|
||
|
|
long siz;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/***
|
||
|
|
* cmap
|
||
|
|
***/
|
||
|
|
struct CmapHead {
|
||
|
|
short version;
|
||
|
|
short nTbls;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct CmapEncodingTbl {
|
||
|
|
short PlatformID;
|
||
|
|
short PlatformSpecEncID;
|
||
|
|
long ofs;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct CmapSubtable {
|
||
|
|
short format;
|
||
|
|
short length;
|
||
|
|
short version;
|
||
|
|
short segCnt2;
|
||
|
|
short searchRange;
|
||
|
|
short rangeShift;
|
||
|
|
short endCnt[2];
|
||
|
|
short reservedPad;
|
||
|
|
short startCnt[2];
|
||
|
|
short idDelta[2];
|
||
|
|
short idRangeOfs[2];
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* maxp
|
||
|
|
***/
|
||
|
|
struct MaxpTbl {
|
||
|
|
char version[4];
|
||
|
|
short numGlyph;
|
||
|
|
short maxPoints;
|
||
|
|
short maxContours;
|
||
|
|
short maxCompositePoints;
|
||
|
|
short maxCompositeContours;
|
||
|
|
short maxZones;
|
||
|
|
short maxTwilightPoints;
|
||
|
|
short maxStorage;
|
||
|
|
short maxFunctionDefs;
|
||
|
|
short maxInstructiondefs;
|
||
|
|
short maxStackElements;
|
||
|
|
short maxSizeOfInstructions;
|
||
|
|
short maxComponentElements;
|
||
|
|
short maxComponentDepth;
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* name
|
||
|
|
***/
|
||
|
|
struct NamingTable {
|
||
|
|
short FormSel;
|
||
|
|
short NRecs;
|
||
|
|
short OfsToStr;
|
||
|
|
/* Following NameRecords */
|
||
|
|
};
|
||
|
|
struct NameRecord {
|
||
|
|
short PlatformID;
|
||
|
|
short PlatformSpecEncID;
|
||
|
|
short LanguageID;
|
||
|
|
short NameID;
|
||
|
|
short StringLength;
|
||
|
|
short StringOfs;
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* head
|
||
|
|
***/
|
||
|
|
struct HeadTable {
|
||
|
|
char version[4]; /* 0x00010000 */
|
||
|
|
char revision[4];
|
||
|
|
unsigned long chkSum;
|
||
|
|
unsigned long magicNumber; /* 0x5F0F3CF5 */
|
||
|
|
short flags;
|
||
|
|
short unitsPerEm;
|
||
|
|
char createdDate[8];
|
||
|
|
char updatedDate[8];
|
||
|
|
short xMin;
|
||
|
|
short yMin;
|
||
|
|
short xMax;
|
||
|
|
short yMax;
|
||
|
|
short macStyle;
|
||
|
|
short lowestRecPPEM;
|
||
|
|
short fontDirectionHint;
|
||
|
|
short indexToLocFormat;
|
||
|
|
short glyphDataFormat; /* 0*/
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* hhea
|
||
|
|
***/
|
||
|
|
struct HheaTable {
|
||
|
|
char version[4];
|
||
|
|
short Ascender;
|
||
|
|
short Descender;
|
||
|
|
short LineGap;
|
||
|
|
short advanceWidthMax;
|
||
|
|
short minLeftSideBearing;
|
||
|
|
short minRightSideBearing;
|
||
|
|
short xMaxExtent;
|
||
|
|
short caretSlopeRise;
|
||
|
|
short caretSlopeRun;
|
||
|
|
short reserved[5];
|
||
|
|
short metricDataFormat;
|
||
|
|
short numberOfHMetrics;
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* hmtx
|
||
|
|
***/
|
||
|
|
struct HMetrics {
|
||
|
|
short advanceWidth;
|
||
|
|
short leftSideBearing;
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* vhea
|
||
|
|
***/
|
||
|
|
struct VheaTable {
|
||
|
|
char version[4];
|
||
|
|
short Ascender;
|
||
|
|
short Descender;
|
||
|
|
short LineGap;
|
||
|
|
short advanceHeightMax;
|
||
|
|
short minTopSideBearing;
|
||
|
|
short minBottomSideBearing;
|
||
|
|
short yMaxExtent;
|
||
|
|
short caretSlopeRise;
|
||
|
|
short caretSlopeRun;
|
||
|
|
short caretOffset;
|
||
|
|
short reserved[4];
|
||
|
|
short metricDataFormat;
|
||
|
|
short numOfLongVerMetrics;
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* vmtx
|
||
|
|
***/
|
||
|
|
struct VMetrics {
|
||
|
|
short advanceHeight;
|
||
|
|
short topSideBearing;
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* post
|
||
|
|
***/
|
||
|
|
struct postTable {
|
||
|
|
char FormatType[4]; /* 00030000 */
|
||
|
|
long italicAngle;
|
||
|
|
short underlinePosition;
|
||
|
|
short underlineThickness;
|
||
|
|
unsigned long isFixedPitch;
|
||
|
|
unsigned long minMemType42;
|
||
|
|
unsigned long maxMemType42;
|
||
|
|
unsigned long minMemType1;
|
||
|
|
unsigned long maxMemType1;
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* OS/2
|
||
|
|
***/
|
||
|
|
/*
|
||
|
|
typedef struct {
|
||
|
|
char bFamily;
|
||
|
|
char bSerifStyle;
|
||
|
|
char bWeight;
|
||
|
|
char bProportion;
|
||
|
|
char bContrast;
|
||
|
|
char bStrokeVariation;
|
||
|
|
char bArmStyle;
|
||
|
|
char bLetterform;
|
||
|
|
char bMidline;
|
||
|
|
char bXHeight;
|
||
|
|
} PANOSE;
|
||
|
|
*/
|
||
|
|
struct OS2Table {
|
||
|
|
unsigned short version;
|
||
|
|
short xAvgCharWidth;
|
||
|
|
unsigned short usWeightClass;
|
||
|
|
unsigned short usWidthClass;
|
||
|
|
short fsType;
|
||
|
|
short ySubscriptXSize;
|
||
|
|
short ySubscriptYSize;
|
||
|
|
short ySubscriptXOffset;
|
||
|
|
short ySubscriptYOffset;
|
||
|
|
short ySuperscriptXSize;
|
||
|
|
short ySuperscriptYSize;
|
||
|
|
short ySuperscriptXOffset;
|
||
|
|
short ySuperscriptYOffset;
|
||
|
|
short yStrikeoutSize;
|
||
|
|
short yStrikeoutPosition;
|
||
|
|
short sFamilyClass;
|
||
|
|
PANOSE panose;
|
||
|
|
unsigned long ulCharRange[4];
|
||
|
|
char achVendID[4];
|
||
|
|
unsigned short fsSelection;
|
||
|
|
unsigned short usFirstCharIndex;
|
||
|
|
unsigned short usLastCharIndex;
|
||
|
|
short sTypoAscender;
|
||
|
|
short sTypoDescender;
|
||
|
|
short sTypoLineGap;
|
||
|
|
unsigned short usWinAscent;
|
||
|
|
unsigned short usWinDescent;
|
||
|
|
};
|
||
|
|
/***
|
||
|
|
* glyf
|
||
|
|
***/
|
||
|
|
struct glyfHead {
|
||
|
|
short numberOfContour;
|
||
|
|
short xMin, yMin;
|
||
|
|
short xMax, yMax;
|
||
|
|
};
|
||
|
|
/** glyf data flag definition **/
|
||
|
|
|
||
|
|
#define GLYF_ON_CURVE 0x01
|
||
|
|
#define GLYF_X_SHORT 0x02 /* x is short */
|
||
|
|
#define GLYF_Y_SHORT 0x04 /* y is short */
|
||
|
|
#define GLYF_X_SHORT_N 0x02 /* x is short & negative */
|
||
|
|
#define GLYF_Y_SHORT_N 0x04 /* y is short & negative */
|
||
|
|
#define GLYF_X_SHORT_P 0x12 /* x is short & positive */
|
||
|
|
#define GLYF_Y_SHORT_P 0x24 /* y is short & positive */
|
||
|
|
#define GLYF_REPEAT 0x08
|
||
|
|
#define GLYF_X_SAME 0x10
|
||
|
|
#define GLYF_Y_SAME 0x20
|
||
|
|
|
||
|
|
/***
|
||
|
|
* Bounding Box ( Not for file structure )
|
||
|
|
***/
|
||
|
|
struct BBX {
|
||
|
|
int xMin, yMin;
|
||
|
|
int xMax, yMax;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* EOF */
|