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freetype/src/shared/tttypes.h

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Initial revision
1999-12-17 00:11:37 +01:00
/***************************************************************************/
/* */
/* tttypes.h */
/* */
/* Basic SFNT/TrueType type definitions and interface (specification */
/* only). */
/* */
/* This code is shared by all TrueType and OpenType drivers. */
/* */
/* */
/* Copyright 1996-1999 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used */
/* modified and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#ifndef TTTYPES_H
#define TTTYPES_H
#include <freetype.h>
#ifdef __cplusplus
extern "C" {
#endif
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** DEFINITIONS OF BASIC DATA TYPES ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* The REDEFINE() macro is used to convert a FreeType generic type into */
/* a TrueType-specific one. It simply replaces the `FT_' prefix by */
/* `TT_' in order to define compatible types like TT_Long, TT_Error, */
/* TT_Outline, etc. */
/* */
#undef REDEFINE
#define REDEFINE( type ) typedef FT_##type TT_##type
/*************************************************************************/
/* */
/* <Type> */
/* TT_Bool */
/* */
/* <Description> */
/* A typedef of unsigned char, used for simple booleans. */
/* */
REDEFINE( Bool );
/*************************************************************************/
/* */
/* <Type> */
/* TT_FWord */
/* */
/* <Description> */
/* A signed 16-bit integer used to store a distance in original font */
/* units. */
/* */
REDEFINE( FWord );
/*************************************************************************/
/* */
/* <Type> */
/* TT_UFWord */
/* */
/* <Description> */
/* An unsigned 16-bit integer used to store a distance in original */
/* font units. */
/* */
REDEFINE( UFWord );
/*************************************************************************/
/* */
/* <Type> */
/* TT_Char */
/* */
/* <Description> */
/* A simple typedef for the _signed_ char type. */
/* */
REDEFINE( Char );
/*************************************************************************/
/* */
/* <Type> */
/* TT_Byte */
/* */
/* <Description> */
/* A simple typedef for the _unsigned_ char type. */
/* */
REDEFINE( Byte );
/*************************************************************************/
/* */
/* <Type> */
/* TT_String */
/* */
/* <Description> */
/* A simple typedef for the char type, usually used for strings. */
/* */
REDEFINE( String );
/*************************************************************************/
/* */
/* <Type> */
/* TT_Short */
/* */
/* <Description> */
/* A typedef for signed short. */
/* */
REDEFINE( Short );
/*************************************************************************/
/* */
/* <Type> */
/* TT_UShort */
/* */
/* <Description> */
/* A typedef for unsigned short. */
/* */
REDEFINE( UShort );
/*************************************************************************/
/* */
/* <Type> */
/* TT_Int */
/* */
/* <Description> */
/* A typedef for the int type. */
/* */
REDEFINE( Int );
/*************************************************************************/
/* */
/* <Type> */
/* TT_UInt */
/* */
/* <Description> */
/* A typedef for the unsigned int type. */
/* */
REDEFINE( UInt );
/*************************************************************************/
/* */
/* <Type> */
/* TT_Long */
/* */
/* <Description> */
/* A typedef for signed long. */
/* */
REDEFINE( Long );
/*************************************************************************/
/* */
/* <Type> */
/* TT_ULong */
/* */
/* <Description> */
/* A typedef for unsigned long. */
/* */
REDEFINE( ULong );
/*************************************************************************/
/* */
/* <Type> */
/* TT_F2Dot14 */
/* */
/* <Description> */
/* A signed 2.14 fixed float type used for unit vectors. */
/* */
REDEFINE( F2Dot14 );
/*************************************************************************/
/* */
/* <Type> */
/* TT_F26Dot6 */
/* */
/* <Description> */
/* A signed 26.6 fixed float type used for vectorial pixel */
/* coordinates. */
/* */
REDEFINE( F26Dot6 );
/*************************************************************************/
/* */
/* <Type> */
/* TT_Fixed */
/* */
/* <Description> */
/* This type is used to store 16.16 fixed float values, like scales */
/* or matrix coefficients. */
/* */
REDEFINE( Fixed );
/*************************************************************************/
/* */
/* <Type> */
/* TT_Pos */
/* */
/* <Description> */
/* The type FT_Pos is a 32-bit integer used to store vectorial */
/* coordinates. Depending on the context, these can represent */
/* distances in integer font units, or 26.6 fixed float pixel */
/* coordinates. */
/* */
REDEFINE( Pos );
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Vector */
/* */
/* <Description> */
/* A simple structure used to store a 2d vector; coordinates are of */
/* the TT_Pos type. */
/* */
/* <Fields> */
/* x :: The horizontal coordinate. */
/* y :: The vertical coordinate. */
/* */
REDEFINE( Vector );
/*************************************************************************/
/* */
/* <Struct> */
/* TT_UnitVector */
/* */
/* <Description> */
/* A simple structure used to store a 2d vector unit vector. Uses */
/* TT_F2Dot14 types. */
/* */
/* <Fields> */
/* x :: Horizontal coordinate. */
/* y :: Vertical coordinate. */
/* */
REDEFINE( UnitVector );
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Matrix */
/* */
/* <Description> */
/* A simple structure used to store a 2x2 matrix. Coefficients are */
/* in 16.16 fixed float format. The computation performed is: */
/* */
/* { */
/* x' = x*xx + y*xy */
/* y' = x*yx + y*yy */
/* } */
/* */
/* <Fields> */
/* xx :: Matrix coefficient. */
/* xy :: Matrix coefficient. */
/* yx :: Matrix coefficient. */
/* yy :: Matrix coefficient. */
/* */
REDEFINE( Matrix );
/*************************************************************************/
/* */
/* <Struct> */
/* TT_BBox */
/* */
/* <Description> */
/* A structure used to hold an outline's bounding box, i.e., the */
/* coordinates of its extrema in the horizontal and vertical */
/* directions. */
/* */
/* <Fields> */
/* xMin :: The horizontal minimum (left-most). */
/* yMin :: The vertical minimum (bottom-most). */
/* xMax :: The horizontal maximum (right-most). */
/* yMax :: The vertical maximum (top-most). */
/* */
REDEFINE( BBox );
/*************************************************************************/
/* */
/* <Type> */
/* TT_Error */
/* */
/* <Description> */
/* The TrueType error code type. A value of 0 is always interpreted */
/* as a successful operation. */
/* */
REDEFINE( Error );
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** REQUIRED TRUETYPE/OPENTYPE TABLES DEFINITIONS ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* TTC_Header */
/* */
/* <Description> */
/* TrueType collection header. This table contains the offsets of */
/* the font headers of each distinct TrueType face in the file. */
/* */
/* <Fields> */
/* tag :: Must be `ttc ' to indicate a TrueType collection. */
/* version :: The version number. */
/* count :: The number of faces in the collection. The */
/* specification says this should be an unsigned long, but */
/* we use a signed long since we need the value -1 for */
/* specific purposes. */
/* offsets :: The offsets of the font headers, one per face. */
/* */
typedef struct TTC_Header_
{
TT_ULong Tag;
TT_Fixed version;
TT_Long DirCount;
TT_ULong* TableDirectory;
} TTC_Header;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_TableDir */
/* */
/* <Description> */
/* This structure models a TrueType table directory. It is used to */
/* access the various tables of the font face. */
/* */
/* <Fields> */
/* version :: The version number; starts with 0x00010000. */
/* numTables :: The number of tables. */
/* */
/* searchRange :: Unused. */
/* entrySelector :: Unused. */
/* rangeShift :: Unused. */
/* */
/* <Note> */
/* This structure is only used during font opening. */
/* */
typedef struct TT_TableDir_
{
TT_Fixed version; /* should be 0x10000 */
TT_UShort numTables; /* number of tables */
TT_UShort searchRange; /* These parameters are only used */
TT_UShort entrySelector; /* for a dichotomy search in the */
TT_UShort rangeShift; /* directory. We ignore them. */
} TT_TableDir;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Table */
/* */
/* <Description> */
/* This structure describes a given table of a TrueType font. */
/* */
/* <Fields> */
/* Tag :: A four-bytes tag describing the table. */
/* CheckSum :: The table checksum. This value can be ignored. */
/* Offset :: The offset of the table from the start of the TrueType */
/* font in its resource. */
/* Length :: The table length (in bytes). */
/* */
typedef struct TT_Table_
{
TT_ULong Tag; /* table type */
TT_ULong CheckSum; /* table checksum */
TT_ULong Offset; /* table file offset */
TT_ULong Length; /* table length */
} TT_Table;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Header */
/* */
/* <Description> */
/* A structure used to model a TrueType font header table. All */
/* fields follow the TrueType specification. */
/* */
typedef struct TT_Header_
{
TT_Fixed Table_Version;
TT_Fixed Font_Revision;
TT_Long CheckSum_Adjust;
TT_Long Magic_Number;
TT_UShort Flags;
TT_UShort Units_Per_EM;
TT_Long Created [2];
TT_Long Modified[2];
TT_FWord xMin;
TT_FWord yMin;
TT_FWord xMax;
TT_FWord yMax;
TT_UShort Mac_Style;
TT_UShort Lowest_Rec_PPEM;
TT_Short Font_Direction;
TT_Short Index_To_Loc_Format;
TT_Short Glyph_Data_Format;
} TT_Header;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_HoriHeader */
/* */
/* <Description> */
/* A structure used to model a TrueType horizontal header, the `hhea' */
/* table, as well as the corresponding horizontal metrics table, */
/* i.e., the `hmtx' table. */
/* */
/* <Fields> */
/* Version :: The table version. */
/* */
/* Ascender :: The font's ascender, i.e., the distance */
/* from the baseline to the top-most of all */
/* glyph points found in the font. */
/* */
/* This value is invalid in many fonts, as */
/* it is usually set by the font designer, */
/* and often reflects only a portion of the */
/* glyphs found in the font (maybe ASCII). */
/* */
/* You should use the `sTypoAscender' field */
/* of the OS/2 table instead if you want */
/* the correct one. */
/* */
/* Descender :: The font's descender, i.e., the distance */
/* from the baseline to the bottom-most of */
/* all glyph points found in the font. It */
/* is negative. */
/* */
/* This value is invalid in many fonts, as */
/* it is usually set by the font designer, */
/* and often reflects only a portion of the */
/* glyphs found in the font (maybe ASCII). */
/* */
/* You should use the `sTypoDescender' */
/* field of the OS/2 table instead if you */
/* want the correct one. */
/* */
/* Line_Gap :: The font's line gap, i.e., the distance */
/* to add to the ascender and descender to */
/* get the BTB, i.e., the */
/* baseline-to-baseline distance for the */
/* font. */
/* */
/* advance_Width_Max :: This field is the maximum of all advance */
/* widths found in the font. It can be */
/* used to compute the maximum width of an */
/* arbitrary string of text. */
/* */
/* min_Left_Side_Bearing :: The minimum left side bearing of all */
/* glyphs within the font. */
/* */
/* min_Right_Side_Bearing :: The minimum right side bearing of all */
/* glyphs within the font. */
/* */
/* xMax_Extent :: The maximum horizontal extent (i.e., the */
/* `width' of a glyph's bounding box) for */
/* all glyphs in the font. */
/* */
/* caret_Slope_Rise :: The rise coefficient of the cursor's */
/* slope of the cursor (slope=rise/run). */
/* */
/* caret_Slope_Run :: The run coefficient of the cursor's */
/* slope. */
/* */
/* Reserved :: 10 reserved bytes. */
/* */
/* metric_Data_Format :: Always 0. */
/* */
/* number_Of_HMetrics :: Number of HMetrics entries in the `hmtx' */
/* table -- this value can be smaller than */
/* the total number of glyphs in the font. */
/* */
/* long_metrics :: A pointer into the `hmtx' table. */
/* */
/* short_metrics :: A pointer into the `hmtx' table. */
/* */
/* <Note> */
/* IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should */
/* be identical except for the names of their fields which */
/* are different. */
/* */
/* This ensures that a single function in the `ttload' */
/* module is able to read both the horizontal and vertical */
/* headers. */
/* */
typedef struct TT_HoriHeader_
{
TT_Fixed Version;
TT_FWord Ascender;
TT_FWord Descender;
TT_FWord Line_Gap;
TT_UFWord advance_Width_Max; /* advance width maximum */
TT_FWord min_Left_Side_Bearing; /* minimum left-sb */
TT_FWord min_Right_Side_Bearing; /* minimum right-sb */
TT_FWord xMax_Extent; /* xmax extents */
TT_FWord caret_Slope_Rise;
TT_FWord caret_Slope_Run;
TT_FWord caret_Offset;
TT_Short Reserved[4];
TT_Short metric_Data_Format;
TT_UShort number_Of_HMetrics;
/* The following fields are not defined by the TrueType specification */
/* but they're used to connect the metrics header to the relevant */
/* `HMTX' table. */
void* long_metrics;
void* short_metrics;
} TT_HoriHeader;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_VertHeader */
/* */
/* <Description> */
/* A structure used to model a TrueType vertical header, the `vhea' */
/* table, as well as the corresponding vertical metrics table, i.e., */
/* the `vmtx' table. */
/* */
/* <Fields> */
/* Version :: The table version. */
/* */
/* Ascender :: The font's ascender, i.e., the distance */
/* from the baseline to the top-most of */
/* all glyph points found in the font. */
/* */
/* This value is invalid in many fonts, as */
/* it is usually set by the font designer, */
/* and often reflects only a portion of */
/* the glyphs found in the font (maybe */
/* ASCII). */
/* */
/* You should use the `sTypoAscender' */
/* field of the OS/2 table instead if you */
/* want the correct one. */
/* */
/* Descender :: The font's descender, i.e., the */
/* distance from the baseline to the */
/* bottom-most of all glyph points found */
/* in the font. It is negative. */
/* */
/* This value is invalid in many fonts, as */
/* it is usually set by the font designer, */
/* and often reflects only a portion of */
/* the glyphs found in the font (maybe */
/* ASCII). */
/* */
/* You should use the `sTypoDescender' */
/* field of the OS/2 table instead if you */
/* want the correct one. */
/* */
/* Line_Gap :: The font's line gap, i.e., the distance */
/* to add to the ascender and descender to */
/* get the BTB, i.e., the */
/* baseline-to-baseline distance for the */
/* font. */
/* */
/* advance_Height_Max :: This field is the maximum of all */
/* advance heights found in the font. It */
/* can be used to compute the maximum */
/* height of an arbitrary string of text. */
/* */
/* min_Top_Side_Bearing :: The minimum top side bearing of all */
/* glyphs within the font. */
/* */
/* min_Bottom_Side_Bearing :: The minimum bottom side bearing of all */
/* glyphs within the font. */
/* */
/* yMax_Extent :: The maximum vertical extent (i.e., the */
/* `height' of a glyph's bounding box) for */
/* all glyphs in the font. */
/* */
/* caret_Slope_Rise :: The rise coefficient of the cursor's */
/* slope of the cursor (slope=rise/run). */
/* */
/* caret_Slope_Run :: The run coefficient of the cursor's */
/* slope. */
/* */
/* Reserved :: 10 reserved bytes. */
/* */
/* metric_Data_Format :: Always 0. */
/* */
/* number_Of_HMetrics :: Number of VMetrics entries in the */
/* `vmtx' table -- this value can be */
/* smaller than the total number of glyphs */
/* in the font. */
/* */
/* long_metrics :: A pointer into the `vmtx' table. */
/* */
/* short_metrics :: A pointer into the `vmtx' table. */
/* */
/* <Note> */
/* IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should */
/* be identical except for the names of their fields which */
/* are different. */
/* */
/* This ensures that a single function in the `ttload' */
/* module is able to read both the horizontal and vertical */
/* headers. */
/* */
typedef struct TT_VertHeader_
{
TT_Fixed Version;
TT_FWord Ascender;
TT_FWord Descender;
TT_FWord Line_Gap;
TT_UFWord advance_Height_Max; /* advance height maximum */
TT_FWord min_Top_Side_Bearing; /* minimum left-sb or top-sb */
TT_FWord min_Bottom_Side_Bearing; /* minimum right-sb or bottom-sb */
TT_FWord yMax_Extent; /* xmax or ymax extents */
TT_FWord caret_Slope_Rise;
TT_FWord caret_Slope_Run;
TT_FWord caret_Offset;
TT_Short Reserved[4];
TT_Short metric_Data_Format;
TT_UShort number_Of_VMetrics;
/* The following fields are not defined by the TrueType specification */
/* but they're used to connect the metrics header to the relevant */
/* `HMTX' or `VMTX' table. */
void* long_metrics;
void* short_metrics;
} TT_VertHeader;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_OS2 */
/* */
/* <Description> */
/* A structure used to model a TrueType OS/2 table. This is the long */
/* table version. All fields comply to the TrueType specification. */
/* */
/* Note that we now support old Mac fonts which do not include an */
/* OS/2 table. In this case, the `version' field is always set to */
/* 0xFFFF. */
/* */
typedef struct TT_OS2_
{
TT_UShort version; /* 0x0001 - more or 0xFFFF */
TT_FWord xAvgCharWidth;
TT_UShort usWeightClass;
TT_UShort usWidthClass;
TT_Short fsType;
TT_FWord ySubscriptXSize;
TT_FWord ySubscriptYSize;
TT_FWord ySubscriptXOffset;
TT_FWord ySubscriptYOffset;
TT_FWord ySuperscriptXSize;
TT_FWord ySuperscriptYSize;
TT_FWord ySuperscriptXOffset;
TT_FWord ySuperscriptYOffset;
TT_FWord yStrikeoutSize;
TT_FWord yStrikeoutPosition;
TT_Short sFamilyClass;
TT_Byte panose[10];
TT_ULong ulUnicodeRange1; /* Bits 0-31 */
TT_ULong ulUnicodeRange2; /* Bits 32-63 */
TT_ULong ulUnicodeRange3; /* Bits 64-95 */
TT_ULong ulUnicodeRange4; /* Bits 96-127 */
TT_Char achVendID[4];
TT_UShort fsSelection;
TT_UShort usFirstCharIndex;
TT_UShort usLastCharIndex;
TT_Short sTypoAscender;
TT_Short sTypoDescender;
TT_Short sTypoLineGap;
TT_UShort usWinAscent;
TT_UShort usWinDescent;
/* only version 1 tables: */
TT_ULong ulCodePageRange1; /* Bits 0-31 */
TT_ULong ulCodePageRange2; /* Bits 32-63 */
} TT_OS2;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Postscript */
/* */
/* <Description> */
/* A structure used to model a TrueType Postscript table. All fields */
/* comply to the TrueType table. This structure does not reference */
/* the Postscript glyph names, which can be nevertheless accessed */
/* with the `ttpost' module. */
/* */
typedef struct TT_Postscript_
{
TT_Fixed FormatType;
TT_Fixed italicAngle;
TT_FWord underlinePosition;
TT_FWord underlineThickness;
TT_ULong isFixedPitch;
TT_ULong minMemType42;
TT_ULong maxMemType42;
TT_ULong minMemType1;
TT_ULong maxMemType1;
/* Glyph names follow in the file, but we don't */
/* load them by default. See the ttpost.c file. */
} TT_Postscript;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_CMapDir */
/* */
/* <Description> */
/* This structure describes the directory of the `cmap' table, */
/* containing the font's character mappings table. */
/* */
/* <Fields> */
/* tableVersionNumber :: The version number. */
/* numCMaps :: The number of charmaps in the font. */
/* */
/* <Note> */
/* This structure is only used during font loading. */
/* */
typedef struct TT_CMapDir_
{
TT_UShort tableVersionNumber;
TT_UShort numCMaps;
} TT_CMapDir;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_CMapDirEntry */
/* */
/* <Description> */
/* This structure describes a charmap in a TrueType font. */
/* */
/* <Fields> */
/* platformID :: An ID used to specify for which platform this */
/* charmap is defined (FreeType manages all platforms). */
/* */
/* encodingID :: A platform-specific ID used to indicate which source */
/* encoding is used in this charmap. */
/* */
/* offset :: The offset of the charmap relative to the start of */
/* the `cmap' table. */
/* */
/* <Note> */
/* This structure is only used during font loading. */
/* */
typedef struct TT_CMapDirEntry_
{
TT_UShort platformID;
TT_UShort platformEncodingID;
TT_Long offset;
} TT_CMapDirEntry;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_MaxProfile */
/* */
/* <Description> */
/* The maximum profile is a table containing many max values which */
/* can be used to pre-allocate arrays. This ensures that no memory */
/* allocation occurs during a glyph load. */
/* */
/* <Fields> */
/* version :: The version number. */
/* */
/* numGlyphs :: The number of glyphs in this TrueType */
/* font. */
/* */
/* maxPoints :: The maximum number of points in a */
/* non-composite TrueType glyph. See also */
/* the structure element */
/* `maxCompositePoints'. */
/* */
/* maxContours :: The maximum number of contours in a */
/* non-composite TrueType glyph. See also */
/* the structure element */
/* `maxCompositeContours'. */
/* */
/* maxCompositePoints :: The maximum number of points in a */
/* composite TrueType glyph. See also the */
/* structure element `maxPoints'. */
/* */
/* maxCompositeContours :: The maximum number of contours in a */
/* composite TrueType glyph. See also the */
/* structure element `maxContours'. */
/* */
/* maxZones :: The maximum number of zones used for */
/* glyph hinting. */
/* */
/* maxTwilightPoints :: The maximum number of points in the */
/* twilight zone used for glyph hinting. */
/* */
/* maxStorage :: The maximum number of elements in the */
/* storage area used for glyph hinting. */
/* */
/* maxFunctionDefs :: The maximum number of function */
/* definitions in the TrueType bytecode for */
/* this font. */
/* */
/* maxInstructionDefs :: The maximum number of instruction */
/* definitions in the TrueType bytecode for */
/* this font. */
/* */
/* maxStackElements :: The maximum number of stack elements used */
/* during bytecode interpretation. */
/* */
/* maxSizeOfInstructions :: The maximum number of TrueType opcodes */
/* used for glyph hinting. */
/* */
/* maxComponentElements :: An obscure value related to composite */
/* glyphs definitions. */
/* */
/* maxComponentDepth :: An obscure value related to composite */
/* glyphs definitions. Probably the maximum */
/* number of simple glyphs in a composite. */
/* */
/* <Note> */
/* This structure is only used during font loading. */
/* */
typedef struct TT_MaxProfile_
{
TT_Fixed version;
TT_UShort numGlyphs;
TT_UShort maxPoints;
TT_UShort maxContours;
TT_UShort maxCompositePoints;
TT_UShort maxCompositeContours;
TT_UShort maxZones;
TT_UShort maxTwilightPoints;
TT_UShort maxStorage;
TT_UShort maxFunctionDefs;
TT_UShort maxInstructionDefs;
TT_UShort maxStackElements;
TT_UShort maxSizeOfInstructions;
TT_UShort maxComponentElements;
TT_UShort maxComponentDepth;
} TT_MaxProfile;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_LongMetrics */
/* */
/* <Description> */
/* A structure modeling the long metrics of the `hmtx' and `vmtx' */
/* TrueType tables. The values are expressed in font units. */
/* */
/* <Fields> */
/* advance :: The advance width or height for the glyph. */
/* bearing :: The left-side or top-side bearing for the glyph. */
/* */
typedef struct TT_LongMetrics_
{
TT_UShort advance;
TT_Short bearing;
} TT_LongMetrics;
/*************************************************************************/
/* */
/* <Type> TT_ShortMetrics */
/* */
/* <Description> */
/* A simple type to model the short metrics of the `hmtx' and `vmtx' */
/* tables. */
/* */
typedef TT_Short TT_ShortMetrics;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_NameRec */
/* */
/* <Description> */
/* A structure modeling TrueType name records. Name records are used */
/* to store important strings like family name, style name, */
/* copyright, etc. in _localized_ versions (i.e., language, encoding, */
/* etc). */
/* */
/* <Fields> */
/* platformID :: The ID of the name's encoding platform. */
/* */
/* encodingID :: The platform-specific ID for the name's encoding. */
/* */
/* languageID :: The platform-specific ID for the name's language. */
/* */
/* nameID :: The ID specifying what kind of name this is. */
/* */
/* stringLength :: The length of the string in bytes. */
/* */
/* stringOffset :: The offset to the string in the `name' table. */
/* */
/* string :: A pointer to the string's bytes. Note that these */
/* are usually UTF-16 encoded characters. */
/* */
typedef struct TT_NameRec_
{
TT_UShort platformID;
TT_UShort encodingID;
TT_UShort languageID;
TT_UShort nameID;
TT_UShort stringLength;
TT_UShort stringOffset;
/* this last field is not defined in the spec */
/* but used by the FreeType engine */
TT_Byte* string;
} TT_NameRec;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_NameTable */
/* */
/* <Description> */
/* A structure modeling the TrueType name table. */
/* */
/* <Fields> */
/* format :: The format of the name table. */
/* */
/* numNameRecords :: The number of names in table. */
/* */
/* storageOffset :: The offset of the name table in the `name' */
/* TrueType table. */
/* */
/* names :: An array of name records. */
/* */
/* storage :: The names storage area. */
/* */
typedef struct TT_NameTable_
{
TT_UShort format;
TT_UShort numNameRecords;
TT_UShort storageOffset;
TT_NameRec* names;
TT_Byte* storage;
} TT_NameTable;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** OPTIONAL TRUETYPE/OPENTYPE TABLES DEFINITIONS ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* TT_GaspRange */
/* */
/* <Description> */
/* A tiny structure used to model a gasp range according to the */
/* TrueType specification. */
/* */
/* <Fields> */
/* maxPPEM :: The maximum ppem value to which `gaspFlag' applies. */
/* */
/* gaspFlag :: A flag describing the grid-fitting and anti-aliasing */
/* modes to be used. */
/* */
typedef struct TT_GaspRange_
{
TT_UShort maxPPEM;
TT_UShort gaspFlag;
} TT_GaspRange;
#define TT_GASP_GRIDFIT 0x01
#define TT_GASP_DOGRAY 0x02
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Gasp */
/* */
/* <Description> */
/* A structure modeling the TrueType `gasp' table used to specify */
/* grid-fitting and anti-aliasing behaviour. */
/* */
/* <Fields> */
/* version :: The version number. */
/* numRanges :: The number of gasp ranges in table. */
/* gaspRanges :: An array of gasp ranges. */
/* */
typedef struct TT_Gasp_
{
TT_UShort version;
TT_UShort numRanges;
TT_GaspRange* gaspRanges;
} TT_Gasp;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_HdmxRec */
/* */
/* <Description> */
/* A small structure used to model the pre-computed widths of a given */
/* size. They're found in the `hdmx' table. */
/* */
/* <Fields> */
/* ppem :: The pixels per EM value at which these metrics apply. */
/* */
/* max_width :: The maximum advance width for this metric. */
/* */
/* widths :: An array of widths. Note: These are 8-bit bytes. */
/* */
typedef struct TT_HdmxRec_
{
TT_Byte ppem;
TT_Byte max_width;
TT_Byte* widths;
} TT_HdmxRec;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_HdmxRec */
/* */
/* <Description> */
/* A structure used to model the `hdmx' table, which contains */
/* pre-computed widths for a set of given sizes/dimensions. */
/* */
/* <Fields> */
/* version :: The version number. */
/* num_records :: The number of hdmx records. */
/* records :: An array of hdmx records. */
/* */
typedef struct TT_Hdmx_
{
TT_UShort version;
TT_Short num_records;
TT_HdmxRec* records;
} TT_Hdmx;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Kern_0_Pair */
/* */
/* <Description> */
/* A structure used to model a kerning pair for the kerning table */
/* format 0. The engine now loads this table if it finds one in the */
/* font file. */
/* */
/* <Fields> */
/* left :: The index of the left glyph in pair. */
/* right :: The index of the right glyph in pair. */
/* value :: The kerning distance. A positive value spaces the */
/* glyphs, a negative one makes them closer. */
/* */
typedef struct TT_Kern_0_Pair_
{
TT_UShort left; /* index of left glyph in pair */
TT_UShort right; /* index of right glyph in pair */
TT_FWord value; /* kerning value */
} TT_Kern_0_Pair;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** EMBEDDED BITMAPS SUPPORT ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* TT_SBit_Metrics */
/* */
/* <Description> */
/* A structure used to hold the big metrics of a given glyph bitmap */
/* in a TrueType or OpenType font. These are usually found in the */
/* `EBDT' (Microsoft) or `bdat' (Apple) table. */
/* */
/* <Fields> */
/* height :: The glyph height in pixels. */
/* */
/* width :: The glyph width in pixels. */
/* */
/* horiBearingX :: The horizontal left bearing. */
/* */
/* horiBearingY :: The horizontal top bearing. */
/* */
/* horiAdvance :: The horizontal advance. */
/* */
/* vertBearingX :: The vertical left bearing. */
/* */
/* vertBearingY :: The vertical top bearing. */
/* */
/* vertAdvance :: The vertical advance. */
/* */
typedef struct TT_SBit_Metrics_
{
TT_Byte height;
TT_Byte width;
TT_Char horiBearingX;
TT_Char horiBearingY;
TT_Byte horiAdvance;
TT_Char vertBearingX;
TT_Char vertBearingY;
TT_Byte vertAdvance;
} TT_SBit_Metrics;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_SBit_Small_Metrics */
/* */
/* <Description> */
/* A structure used to hold the small metrics of a given glyph bitmap */
/* in a TrueType or OpenType font. These are usually found in the */
/* `EBDT' (Microsoft) or the `bdat' (Apple) table. */
/* */
/* <Fields> */
/* height :: The glyph height in pixels. */
/* */
/* width :: The glyph width in pixels. */
/* */
/* bearingX :: The left-side bearing. */
/* */
/* bearingY :: The top-side bearing. */
/* */
/* advance :: The advance width or height. */
/* */
typedef struct TT_SBit_Small_Metrics_
{
TT_Byte height;
TT_Byte width;
TT_Char bearingX;
TT_Char bearingY;
TT_Byte advance;
} TT_SBit_Small_Metrics;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_SBit_Line_Metrics */
/* */
/* <Description> */
/* A structure used to describe the text line metrics of a given */
/* bitmap strike, for either a horizontal or vertical layout. */
/* */
/* <Fields> */
/* ascender :: The ascender in pixels. */
/* */
/* descender :: The descender in pixels. */
/* */
/* max_width :: The maximum glyph width in pixels. */
/* */
/* caret_slope_enumerator :: Rise of the caret slope, typically set */
/* to 1 for non-italic fonts. */
/* */
/* caret_slope_denominator :: Rise of the caret slope, typically set */
/* to 0 for non-italic fonts. */
/* */
/* caret_offset :: Offset in pixels to move the caret for */
/* proper positioning. */
/* */
/* min_origin_SB :: Minimum of horiBearingX (resp. */
/* vertBearingY). */
/* min_advance_SB :: Minimum of */
/* */
/* horizontal advance - */
/* ( horiBearingX + width ) */
/* */
/* resp. */
/* */
/* vertical advance - */
/* ( vertBearingY + height ) */
/* */
/* max_before_BL :: Maximum of horiBearingY (resp. */
/* vertBearingY). */
/* */
/* min_after_BL :: Minimum of */
/* */
/* horiBearingY - height */
/* */
/* resp. */
/* */
/* vertBearingX - width */
/* */
typedef struct TT_SBit_Line_Metrics_
{
TT_Char ascender;
TT_Char descender;
TT_Byte max_width;
TT_Char caret_slope_numerator;
TT_Char caret_slope_denominator;
TT_Char caret_offset;
TT_Char min_origin_SB;
TT_Char min_advance_SB;
TT_Char max_before_BL;
TT_Char min_after_BL;
TT_Char pads[2];
} TT_SBit_Line_Metrics;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_SBit_Range */
/* */
/* <Description> */
/* A TrueType/OpenType subIndexTable as defined in the `EBLC' */
/* (Microsoft) or `bloc' (Apple) tables. */
/* */
/* <Fields> */
/* first_glyph :: The first glyph index in the range. */
/* */
/* last_glyph :: The last glyph index in the range. */
/* */
/* index_format :: The format of index table. Valid values are 1 */
/* to 5. */
/* */
/* image_format :: The format of `EBDT' image data. */
/* */
/* image_offset :: The offset to image data in `EBDT'. */
/* */
/* image_size :: For index formats 2 and 5. This is the size in */
/* bytes of each glyph bitmap. */
/* */
/* big_metrics :: For index formats 2 and 5. This is the big */
/* metrics for each glyph bitmap. */
/* */
/* num_glyphs :: For index formats 4 and 5. This is the number of */
/* glyphs in the code array. */
/* */
/* glyph_offsets :: For index formats 1 and 3. */
/* */
/* glyph_codes :: For index formats 4 and 5. */
/* */
/* table_offset :: The offset of the index table in the `EBLC' */
/* table. Only used during strike loading. */
/* */
typedef struct TT_SBit_Range
{
TT_UShort first_glyph;
TT_UShort last_glyph;
TT_UShort index_format;
TT_UShort image_format;
TT_ULong image_offset;
TT_ULong image_size;
TT_SBit_Metrics metrics;
TT_ULong num_glyphs;
TT_ULong* glyph_offsets;
TT_UShort* glyph_codes;
TT_ULong table_offset;
} TT_SBit_Range;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_SBit_Strike */
/* */
/* <Description> */
/* A structure used describe a given bitmap strike in the `EBLC' */
/* (Microsoft) or `bloc' (Apple) tables. */
/* */
/* <Fields> */
/* num_index_ranges :: The number of index ranges. */
/* */
/* index_ranges :: An array of glyph index ranges. */
/* */
/* color_ref :: Unused. A color reference? */
/* */
/* hori :: The line metrics for horizontal layouts. */
/* */
/* vert :: The line metrics for vertical layouts. */
/* */
/* start_glyph :: The lowest glyph index for this strike. */
/* */
/* end_glyph :: The highest glyph index for this strike. */
/* */
/* x_ppem :: The number of horizontal pixels per EM. */
/* */
/* y_ppem :: The number of vertical pixels per EM. */
/* */
/* bit_depth :: The bit depth. Valid values are 1, 2, 4, */
/* and 8. */
/* */
/* flags :: Is this a vertical or horizontal strike? */
/* */
typedef struct TT_SBit_Strike_
{
TT_Int num_ranges;
TT_SBit_Range* sbit_ranges;
TT_ULong ranges_offset;
TT_ULong color_ref;
TT_SBit_Line_Metrics hori;
TT_SBit_Line_Metrics vert;
TT_UShort start_glyph;
TT_UShort end_glyph;
TT_Byte x_ppem;
TT_Byte y_ppem;
TT_Byte bit_depth;
TT_Char flags;
} TT_SBit_Strike;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_SBit_Component */
/* */
/* <Description> */
/* A simple structure to describe a compound sbit element. */
/* */
/* <Fields> */
/* glyph_code :: The element's glyph index. */
/* x_offset :: The element's left bearing. */
/* y_offset :: The element's top bearing. */
/* */
typedef struct TT_SBit_Component_
{
TT_UShort glyph_code;
TT_Char x_offset;
TT_Char y_offset;
} TT_SBit_Component;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_SBit_Scale */
/* */
/* <Description> */
/* A structure used describe a given bitmap scaling table, as defined */
/* in the `EBSC' table. */
/* */
/* <Fields> */
/* hori :: The horizontal line metrics. */
/* */
/* vert :: The vertical line metrics. */
/* */
/* x_ppem :: The number of horizontal pixels per EM. */
/* */
/* y_ppem :: The number of vertical pixels per EM. */
/* */
/* x_ppem_substitute :: Substitution x_ppem value. */
/* */
/* y_ppem_substitute :: Substitution y_ppem value. */
/* */
typedef struct TT_SBit_Scale_
{
TT_SBit_Line_Metrics hori;
TT_SBit_Line_Metrics vert;
TT_Byte x_ppem;
TT_Byte y_ppem;
TT_Byte x_ppem_substitute;
TT_Byte y_ppem_substitute;
} TT_SBit_Scale;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** POSTSCRIPT GLYPH NAMES SUPPORT ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Post_20 */
/* */
/* <Description> */
/* Postscript names sub-table, format 2.0. Stores the PS name of */
/* each glyph in the font face. */
/* */
/* <Fields> */
/* num_glyphs :: The number of named glyphs in the table. */
/* */
/* num_names :: The number of PS names stored in the table. */
/* */
/* glyph_indices :: The indices of the glyphs in the names arrays. */
/* */
/* glyph_names :: The PS names not in Mac Encoding. */
/* */
typedef struct TT_Post_20_
{
TT_UShort num_glyphs;
TT_UShort num_names;
TT_UShort* glyph_indices;
TT_Char** glyph_names;
} TT_Post_20;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Post_25 */
/* */
/* <Description> */
/* Postscript names sub-table, format 2.5. Stores the PS name of */
/* each glyph in the font face. */
/* */
/* <Fields> */
/* num_glyphs :: The number of glyphs in the table. */
/* */
/* offsets :: An array of signed offsets in a normal Mac */
/* Postscript name encoding. */
/* */
typedef struct TT_Post_25_
{
TT_UShort num_glyphs;
TT_Char* offsets;
} TT_Post_25;
/*************************************************************************/
/* */
/* <Struct> */
/* TT_Post_Names */
/* */
/* <Description> */
/* Postscript names table, either format 2.0 or 2.5. */
/* */
/* <Fields> */
/* loaded :: A flag to indicate whether the PS names are loaded. */
/* */
/* format_20 :: The sub-table used for format 2.0. */
/* */
/* format_25 :: The sub-table used for format 2.5. */
/* */
typedef struct TT_Post_Names_
{
TT_Bool loaded;
union
{
TT_Post_20 format_20;
TT_Post_25 format_25;
} names;
} TT_Post_Names;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** TRUETYPE CHARMAPS SUPPORT ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* format 0 */
typedef struct TT_CMap0_
{
TT_Byte* glyphIdArray;
} TT_CMap0;
/* format 2 */
typedef struct TT_CMap2SubHeader_
{
TT_UShort firstCode; /* first valid low byte */
TT_UShort entryCount; /* number of valid low bytes */
TT_Short idDelta; /* delta value to glyphIndex */
TT_UShort idRangeOffset; /* offset from here to 1st code */
} TT_CMap2SubHeader;
typedef struct TT_CMap2_
{
TT_UShort* subHeaderKeys;
/* high byte mapping table */
/* value = subHeader index * 8 */
TT_CMap2SubHeader* subHeaders;
TT_UShort* glyphIdArray;
TT_UShort numGlyphId; /* control value */
} TT_CMap2;
/* format 4 */
typedef struct TT_CMap4Segment_
{
TT_UShort endCount;
TT_UShort startCount;
TT_Short idDelta;
TT_UShort idRangeOffset;
} TT_CMap4Segment;
typedef struct TT_CMap4_
{
TT_UShort segCountX2; /* number of segments * 2 */
TT_UShort searchRange; /* these parameters can be used */
TT_UShort entrySelector; /* for a binary search */
TT_UShort rangeShift;
TT_CMap4Segment* segments;
TT_UShort* glyphIdArray;
TT_UShort numGlyphId; /* control value */
} TT_CMap4;
/* format 6 */
typedef struct TT_CMap6_
{
TT_UShort firstCode; /* first character code of subrange */
TT_UShort entryCount; /* number of character codes in subrange */
TT_UShort* glyphIdArray;
} TT_CMap6;
typedef struct TT_CMapTable_ TT_CMapTable;
typedef
TT_UInt (*TT_CharMap_Func)( TT_CMapTable* charmap,
TT_ULong char_code );
/* charmap table */
struct TT_CMapTable_
{
TT_UShort platformID;
TT_UShort platformEncodingID;
TT_UShort format;
TT_UShort length;
TT_UShort version;
TT_Bool loaded;
TT_ULong offset;
union
{
TT_CMap0 cmap0;
TT_CMap2 cmap2;
TT_CMap4 cmap4;
TT_CMap6 cmap6;
} c;
TT_CharMap_Func get_index;
};
/*************************************************************************/
/* */
/* <Struct> */
/* TT_CharMapRec */
/* */
/* <Description> */
/* The TrueType character map object type. */
/* */
/* <Fields> */
/* root :: The parent character map structure. */
/* cmap :: The used character map. */
/* */
typedef struct TT_CharMapRec_
{
FT_CharMapRec root;
TT_CMapTable cmap;
} TT_CharMapRec;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** ORIGINAL TT_FACE CLASS DEFINITION ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* This structure/class is defined here because it is common to the */
/* following formats: TTF, OpenType-TT, and OpenType-CFF. */
/* */
/* Note however that the classes TT_Size, TT_GlyphSlot, and TT_CharMap */
/* are not shared between font drivers, and are thus defined normally in */
/* `drivers/truetype/ttobjs.h'. */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* <Type> */
/* TT_Face */
/* */
/* <Description> */
/* A handle to a TrueType face/font object. A TT_Face encapsulates */
/* the resolution and scaling independent parts of a TrueType font */
/* resource. */
/* */
/* <Note> */
/* The TT_Face structure is also used as a `parent class' for the */
/* OpenType-CFF class (T2_Face). */
/* */
typedef struct TT_FaceRec_* TT_Face;
/*************************************************************************/
/* */
/* <Type> */
/* TT_CharMap */
/* */
/* <Description> */
/* A handle to a TrueType character mapping object. */
/* */
typedef struct TT_CharMapRec_* TT_CharMap;
/* a function type used for the truetype bytecode interpreter hooks */
typedef TT_Error (*TT_Interpreter)( void* exec_context );
/*************************************************************************/
/* */
/* <FuncType> */
/* TT_Goto_Table_Func */
/* */
/* <Description> */
/* Seeks a stream to the start of a given TrueType table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* tag :: a 4-byte tag used to name the table */
/* stream :: The input stream. */
/* */
/* <Output> */
/* length :: length of table in bytes. Set to 0 when not needed */
/* */
/* <Return> */
/* TrueType error code. 0 means success. */
/* */
/* <Note> */
/* The stream cursor must be at the font file's origin */
/* */
typedef
TT_Error (*TT_Goto_Table_Func)( TT_Face face,
TT_ULong tag,
FT_Stream stream,
TT_ULong *length );
/*************************************************************************/
/* */
/* TrueType Face Type */
/* */
/* <Struct> */
/* TT_Face */
/* */
/* <Description> */
/* The TrueType face class. These objects model the resolution and */
/* point-size independent data found in a TrueType font file. */
/* */
/* <Fields> */
/* root :: The base FT_Face structure, managed by the */
/* base layer. */
/* */
/* ttcHeader :: The TrueType collection header, used when the */
/* file is a `ttc' rather than a `ttf'. For */
/* ordinary font files, the field */
/* `ttcHeader.DirCount' is set to 0. */
/* */
/* num_tables :: The number of TrueType tables in this font */
/* file. */
/* */
/* dir_tables :: The directory of TrueType tables for this */
/* font file. */
/* */
/* header :: The font's font header (`head' table). Read */
/* on font opening. */
/* */
/* horizontal :: The font's horizontal header (`hhea' table). */
/* This field also contains the associated */
/* horizontal metrics table (`hmtx'). */
/* */
/* max_profile :: The font's maximum profile table. Read on */
/* font opening. Note that some maximum values */
/* cannot be taken directly from this table. We */
/* thus define additional fields below to hold */
/* the computed maxima. */
/* */
/* max_components :: The maximum number of glyph components */
/* required to load any composite glyph from */
/* this font. Used to size the load stack. */
/* */
/* vertical_info :: A boolean which is set when the font file */
/* contains vertical metrics. If not, the value */
/* of the `vertical' field is undefined. */
/* */
/* vertical :: The font's vertical header (`vhea' table). */
/* This field also contains the associated */
/* vertical metrics table (`vmtx'), if found. */
/* IMPORTANT: The contents of this field is */
/* undefined if the `verticalInfo' field is */
/* unset. */
/* */
/* num_names :: The number of name records within this */
/* TrueType font. */
/* */
/* name_table :: The table of name records (`name'). */
/* */
/* os2 :: The font's OS/2 table (`OS/2'). */
/* */
/* postscript :: The font's PostScript table (`post' table). */
/* The PostScript glyph names are not loaded by */
/* the driver on face opening. See the `ttpost' */
/* module for more details. */
/* */
/* num_charmaps :: The number of character mappings in the font. */
/* */
/* charmaps :: The array of charmap objects for this font */
/* file. Note that this field is a typeless */
/* pointer. The Reason is that the format of */
/* charmaps varies with the underlying font */
/* format and cannot be determined here. */
/* */
/* goto_face :: a function called by each TrueType table */
/* loader to position a stream's cursor to the */
/* start of a given table according to its tag. */
/* it defaults to TT_Goto_Face but can be */
/* different for strange formats (e.g. Type 42) */
/* */
/* sfnt :: a pointer to the SFNT `driver' interface. */
/* */
/* hdmx :: The face's horizontal device metrics (`hdmx' */
/* table). This table is optional in */
/* TrueType/OpenType fonts. */
/* */
/* gasp :: The grid-fitting and scaling properties table */
/* (`gasp'). This table is optional in */
/* TrueType/OpenType fonts. */
/* */
/* num_sbit_strikes :: The number of sbit strikes, i.e., bitmap */
/* sizes, embedded in this font. */
/* */
/* sbit_strikes :: An array of sbit strikes embedded in this */
/* font. This table is optional in a */
/* TrueType/OpenType font. */
/* */
/* num_sbit_scales :: The number of sbit scales for this font. */
/* */
/* sbit_scales :: Array of sbit scales embedded in this font. */
/* This table is optional in a TrueType/OpenType */
/* font. */
/* */
/* postscript_names :: A table used to store the Postscript names of */
/* the glyphs for this font. See the file */
/* `ttconfig.h' for comments on the */
/* TT_CONFIG_OPTION_POSTSCRIPT_NAMES option. */
/* */
/* num_locations :: The number of glyph locations in this */
/* TrueType file. This should be identical to */
/* the number of glyphs. Ignored for Type 2 */
/* fonts. */
/* */
/* glyph_locations :: An array of longs. These are offsets to */
/* glyph data within the `glyf' table. Ignored */
/* for Type 2 font faces. */
/* */
/* font_program_size :: Size in bytecodes of the face's font program. */
/* 0 if none defined. Ignored for Type 2 fonts. */
/* */
/* font_program :: The face's font program (bytecode stream) */
/* executed at load time, also used during glyph */
/* rendering. Comes from the `fpgm' table. */
/* Ignored for Type 2 font fonts. */
/* */
/* cvt_program_size :: Size in bytecodes of the face's cvt program. */
/* Ignored for Type 2 fonts. */
/* */
/* cvt_program :: The face's cvt program (bytecode stream) */
/* executed each time an instance/size is */
/* changed/reset. Comes from the `prep' table. */
/* Ignored for Type 2 fonts. */
/* */
/* cvt_size :: Size of the control value table (in entries). */
/* Ignored for Type 2 fonts. */
/* */
/* cvt :: The face's original control value table. */
/* Coordinates are expressed in unscaled font */
/* units. Comes from the `cvt ` table. Ignored */
/* for Type 2 fonts. */
/* */
/* num_kern_pairs :: The number of kerning pairs present in the */
/* font file. The engine only loads the first */
/* horizontal format 0 kern table it finds in */
/* the font file. You should use the `ttxkern' */
/* structures if you want to access other */
/* kerning tables. Ignored for Type 2 fonts. */
/* */
/* kern_table_index :: The index of the kerning table in the font */
/* kerning directory. Only used by the ttxkern */
/* extension to avoid data duplication. Ignored */
/* for Type 2 fonts. */
/* */
/* kern_pairs :: Array of kerning pairs, if any. Ignored for */
/* Type 2 fonts. */
/* */
/* interpreter :: Pointer to the TrueType bytecode interpreter */
/* this field is also used to hook the debugger */
/* in `ttdebug' */
/* */
typedef struct TT_FaceRec_
{
FT_FaceRec root;
TTC_Header ttc_header;
TT_UShort num_tables;
TT_Table* dir_tables;
TT_Header header; /* TrueType header table */
TT_HoriHeader horizontal; /* TrueType horizontal header */
TT_MaxProfile max_profile;
TT_ULong max_components;
TT_Bool vertical_info;
TT_VertHeader vertical; /* TT Vertical header, if present */
TT_Int num_names; /* number of name records */
TT_NameTable name_table; /* name table */
TT_OS2 os2; /* TrueType OS/2 table */
TT_Postscript postscript; /* TrueType Postscript table */
TT_Int num_charmaps;
TT_CharMap charmaps; /* array of TT_CharMapRec */
/* a pointer to the function used to seek a stream to the start of */
/* a given TrueType table. This should default to the function */
/* TT_Goto_Table defined in `ttload.h', but some font drivers */
/* might need something different, e.g. Type 42 fonts */
TT_Goto_Table_Func goto_table;
/* a typeless pointer to the SFNT_Interface table used to load */
/* the basic TrueType tables in the face object */
void* sfnt;
/***********************************************************************/
/* */
/* Optional TrueType/OpenType tables */
/* */
/***********************************************************************/
/* horizontal device metrics */
TT_Hdmx hdmx;
/* grid-fitting and scaling table */
TT_Gasp gasp; /* the `gasp' table */
/* embedded bitmaps support */
TT_Int num_sbit_strikes;
TT_SBit_Strike* sbit_strikes;
TT_Int num_sbit_scales;
TT_SBit_Scale* sbit_scales;
/* postscript names table */
TT_Post_Names postscript_names;
/***********************************************************************/
/* */
/* TrueType-specific fields (ignored by the OTF-Type2 driver) */
/* */
/***********************************************************************/
/* the glyph locations */
TT_UShort num_locations;
TT_Long* glyph_locations;
/* the font program, if any */
TT_ULong font_program_size;
TT_Byte* font_program;
/* the cvt program, if any */
TT_ULong cvt_program_size;
TT_Byte* cvt_program;
/* the original, unscaled, control value table */
TT_ULong cvt_size;
TT_Short* cvt;
/* the format 0 kerning table, if any */
TT_Int num_kern_pairs;
TT_Int kern_table_index;
TT_Kern_0_Pair* kern_pairs;
/* a pointer to the bytecode interpreter to use. This is also */
/* used to hook the debugger for the `ttdebug' utility.. */
TT_Interpreter interpreter;
} TT_FaceRec;
#ifdef __cplusplus
}
#endif
#endif /* TTTYPES_H */
/* END */
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