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tttypes.h
/****************************************************************************
*
* tttypes.h
*
* Basic SFNT/TrueType type definitions and interface (specification
* only).
*
* Copyright (C) 1996-2019 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 <ft2build.h>
#include FT_TRUETYPE_TABLES_H
#include FT_INTERNAL_OBJECTS_H
#include FT_COLOR_H
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include FT_MULTIPLE_MASTERS_H
#endif
FT_BEGIN_HEADER
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** REQUIRED TRUETYPE/OPENTYPE TABLES DEFINITIONS ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* @struct:
* TTC_HeaderRec
*
* @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_HeaderRec_
{
FT_ULong tag;
FT_Fixed version;
FT_Long count;
FT_ULong* offsets;
} TTC_HeaderRec;
/**************************************************************************
*
* @struct:
* SFNT_HeaderRec
*
* @description:
* SFNT file format header.
*
* @fields:
* format_tag ::
* The font format tag.
*
* num_tables ::
* The number of tables in file.
*
* search_range ::
* Must be '16 * (max power of 2 <= num_tables)'.
*
* entry_selector ::
* Must be log2 of 'search_range / 16'.
*
* range_shift ::
* Must be 'num_tables * 16 - search_range'.
*/
typedef struct SFNT_HeaderRec_
{
FT_ULong format_tag;
FT_UShort num_tables;
FT_UShort search_range;
FT_UShort entry_selector;
FT_UShort range_shift;
FT_ULong offset; /* not in file */
} SFNT_HeaderRec, *SFNT_Header;
/**************************************************************************
*
* @struct:
* TT_TableRec
*
* @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_TableRec_
{
FT_ULong Tag; /* table type */
FT_ULong CheckSum; /* table checksum */
FT_ULong Offset; /* table file offset */
FT_ULong Length; /* table length */
} TT_TableRec, *TT_Table;
/**************************************************************************
*
* @struct:
* TT_LongMetricsRec
*
* @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_LongMetricsRec_
{
FT_UShort advance;
FT_Short bearing;
} TT_LongMetricsRec, *TT_LongMetrics;
/**************************************************************************
*
* @type:
* TT_ShortMetrics
*
* @description:
* A simple type to model the short metrics of the 'hmtx' and 'vmtx'
* tables.
*/
typedef FT_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_
{
FT_UShort platformID;
FT_UShort encodingID;
FT_UShort languageID;
FT_UShort nameID;
FT_UShort stringLength;
FT_ULong stringOffset;
/* this last field is not defined in the spec */
/* but used by the FreeType engine */
FT_Byte* string;
} TT_NameRec, *TT_Name;
/**************************************************************************
*
* @struct:
* TT_LangTagRec
*
* @description:
* A structure modeling language tag records in SFNT 'name' tables,
* introduced in OpenType version 1.6.
*
* @fields:
* 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 UTF-16BE
* encoded characters.
*/
typedef struct TT_LangTagRec_
{
FT_UShort stringLength;
FT_ULong stringOffset;
/* this last field is not defined in the spec */
/* but used by the FreeType engine */
FT_Byte* string;
} TT_LangTagRec, *TT_LangTag;
/**************************************************************************
*
* @struct:
* TT_NameTableRec
*
* @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.
*
* numLangTagRecords ::
* The number of language tags in table.
*
* langTags ::
* An array of language tag records.
*
* stream ::
* The file's input stream.
*/
typedef struct TT_NameTableRec_
{
FT_UShort format;
FT_UInt numNameRecords;
FT_UInt storageOffset;
TT_NameRec* names;
FT_UInt numLangTagRecords;
TT_LangTagRec* langTags;
FT_Stream stream;
} TT_NameTableRec, *TT_NameTable;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** OPTIONAL TRUETYPE/OPENTYPE TABLES DEFINITIONS ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* @struct:
* TT_GaspRangeRec
*
* @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_GaspRangeRec_
{
FT_UShort maxPPEM;
FT_UShort gaspFlag;
} TT_GaspRangeRec, *TT_GaspRange;
#define TT_GASP_GRIDFIT 0x01
#define TT_GASP_DOGRAY 0x02
/**************************************************************************
*
* @struct:
* TT_GaspRec
*
* @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_
{
FT_UShort version;
FT_UShort numRanges;
TT_GaspRange gaspRanges;
} TT_GaspRec;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** EMBEDDED BITMAPS SUPPORT ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* @struct:
* TT_SBit_MetricsRec
*
* @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 'bloc' (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_MetricsRec_
{
FT_UShort height;
FT_UShort width;
FT_Short horiBearingX;
FT_Short horiBearingY;
FT_UShort horiAdvance;
FT_Short vertBearingX;
FT_Short vertBearingY;
FT_UShort vertAdvance;
} TT_SBit_MetricsRec, *TT_SBit_Metrics;
/**************************************************************************
*
* @struct:
* TT_SBit_SmallMetricsRec
*
* @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_
{
FT_Byte height;
FT_Byte width;
FT_Char bearingX;
FT_Char bearingY;
FT_Byte advance;
} TT_SBit_SmallMetricsRec, *TT_SBit_SmallMetrics;
/**************************************************************************
*
* @struct:
* TT_SBit_LineMetricsRec
*
* @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
*
* pads ::
* Unused (to make the size of the record a multiple of 32 bits.
*/
typedef struct TT_SBit_LineMetricsRec_
{
FT_Char ascender;
FT_Char descender;
FT_Byte max_width;
FT_Char caret_slope_numerator;
FT_Char caret_slope_denominator;
FT_Char caret_offset;
FT_Char min_origin_SB;
FT_Char min_advance_SB;
FT_Char max_before_BL;
FT_Char min_after_BL;
FT_Char pads[2];
} TT_SBit_LineMetricsRec, *TT_SBit_LineMetrics;
/**************************************************************************
*
* @struct:
* TT_SBit_RangeRec
*
* @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_RangeRec_
{
FT_UShort first_glyph;
FT_UShort last_glyph;
FT_UShort index_format;
FT_UShort image_format;
FT_ULong image_offset;
FT_ULong image_size;
TT_SBit_MetricsRec metrics;
FT_ULong num_glyphs;
FT_ULong* glyph_offsets;
FT_UShort* glyph_codes;
FT_ULong table_offset;
} TT_SBit_RangeRec, *TT_SBit_Range;
/**************************************************************************
*
* @struct:
* TT_SBit_StrikeRec
*
* @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. `color_ref` is put in for future enhancements, but these
* fields are already in use by other platforms (e.g. Newton). For
* details, please see
*
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bloc.html
*
* 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? For details, please see
*
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bloc.html
*/
typedef struct TT_SBit_StrikeRec_
{
FT_Int num_ranges;
TT_SBit_Range sbit_ranges;
FT_ULong ranges_offset;
FT_ULong color_ref;
TT_SBit_LineMetricsRec hori;
TT_SBit_LineMetricsRec vert;
FT_UShort start_glyph;
FT_UShort end_glyph;
FT_Byte x_ppem;
FT_Byte y_ppem;
FT_Byte bit_depth;
FT_Char flags;
} TT_SBit_StrikeRec, *TT_SBit_Strike;
/**************************************************************************
*
* @struct:
* TT_SBit_ComponentRec
*
* @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_ComponentRec_
{
FT_UShort glyph_code;
FT_Char x_offset;
FT_Char y_offset;
} TT_SBit_ComponentRec, *TT_SBit_Component;
/**************************************************************************
*
* @struct:
* TT_SBit_ScaleRec
*
* @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_ScaleRec_
{
TT_SBit_LineMetricsRec hori;
TT_SBit_LineMetricsRec vert;
FT_Byte x_ppem;
FT_Byte y_ppem;
FT_Byte x_ppem_substitute;
FT_Byte y_ppem_substitute;
} TT_SBit_ScaleRec, *TT_SBit_Scale;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** POSTSCRIPT GLYPH NAMES SUPPORT ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* @struct:
* TT_Post_20Rec
*
* @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_20Rec_
{
FT_UShort num_glyphs;
FT_UShort num_names;
FT_UShort* glyph_indices;
FT_Char** glyph_names;
} TT_Post_20Rec, *TT_Post_20;
/**************************************************************************
*
* @struct:
* TT_Post_25Rec
*
* @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_
{
FT_UShort num_glyphs;
FT_Char* offsets;
} TT_Post_25Rec, *TT_Post_25;
/**************************************************************************
*
* @struct:
* TT_Post_NamesRec
*
* @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_NamesRec_
{
FT_Bool loaded;
union
{
TT_Post_20Rec format_20;
TT_Post_25Rec format_25;
} names;
} TT_Post_NamesRec, *TT_Post_Names;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** GX VARIATION TABLE SUPPORT ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
typedef struct GX_BlendRec_ *GX_Blend;
#endif
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** EMBEDDED BDF PROPERTIES TABLE SUPPORT ***/
/*** ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*
* These types are used to support a `BDF ' table that isn't part of the
* official TrueType specification. It is mainly used in SFNT-based bitmap
* fonts that were generated from a set of BDF fonts.
*
* The format of the table is as follows.
*
* USHORT version `BDF ' table version number, should be 0x0001. USHORT
* strikeCount Number of strikes (bitmap sizes) in this table. ULONG
* stringTable Offset (from start of BDF table) to string
* table.
*
* This is followed by an array of `strikeCount' descriptors, having the
* following format.
*
* USHORT ppem Vertical pixels per EM for this strike. USHORT numItems
* Number of items for this strike (properties and
* atoms). Maximum is 255.
*
* This array in turn is followed by `strikeCount' value sets. Each `value
* set' is an array of `numItems' items with the following format.
*
* ULONG item_name Offset in string table to item name.
* USHORT item_type The item type. Possible values are
* 0 => string (e.g., COMMENT)
* 1 => atom (e.g., FONT or even SIZE)
* 2 => int32
* 3 => uint32
* 0x10 => A flag to indicate a properties. This
* is ORed with the above values.
* ULONG item_value For strings => Offset into string table without
* the corresponding double quotes.
* For atoms => Offset into string table.
* For integers => Direct value.
*
* All strings in the string table consist of bytes and are
* zero-terminated.
*
*/
#ifdef TT_CONFIG_OPTION_BDF
typedef struct TT_BDFRec_
{
FT_Byte* table;
FT_Byte* table_end;
FT_Byte* strings;
FT_ULong strings_size;
FT_UInt num_strikes;
FT_Bool loaded;
} TT_BDFRec, *TT_BDF;
#endif /* TT_CONFIG_OPTION_BDF */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** ***/
/*** 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 and TT_GlyphSlot are not shared
* between font drivers, and are thus defined in `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;
/* a function type used for the truetype bytecode interpreter hooks */
typedef FT_Error
(*TT_Interpreter)( void* exec_context );
/* forward declaration */
typedef struct TT_LoaderRec_* TT_Loader;
/**************************************************************************
*
* @functype:
* TT_Loader_GotoTableFunc
*
* @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 ::
* The length of the table in bytes. Set to 0 if not needed.
*
* @return:
* FreeType error code. 0 means success.
*
* @note:
* The stream cursor must be at the font file's origin.
*/
typedef FT_Error
(*TT_Loader_GotoTableFunc)( TT_Face face,
FT_ULong tag,
FT_Stream stream,
FT_ULong* length );
/**************************************************************************
*
* @functype:
* TT_Loader_StartGlyphFunc
*
* @description:
* Seeks a stream to the start of a given glyph element, and opens a
* frame for it.
*
* @input:
* loader ::
* The current TrueType glyph loader object.
*
* glyph index :: The index of the glyph to access.
*
* offset ::
* The offset of the glyph according to the 'locations' table.
*
* byte_count ::
* The size of the frame in bytes.
*
* @return:
* FreeType error code. 0 means success.
*
* @note:
* This function is normally equivalent to FT_STREAM_SEEK(offset)
* followed by FT_FRAME_ENTER(byte_count) with the loader's stream, but
* alternative formats (e.g. compressed ones) might use something
* different.
*/
typedef FT_Error
(*TT_Loader_StartGlyphFunc)( TT_Loader loader,
FT_UInt glyph_index,
FT_ULong offset,
FT_UInt byte_count );
/**************************************************************************
*
* @functype:
* TT_Loader_ReadGlyphFunc
*
* @description:
* Reads one glyph element (its header, a simple glyph, or a composite)
* from the loader's current stream frame.
*
* @input:
* loader ::
* The current TrueType glyph loader object.
*
* @return:
* FreeType error code. 0 means success.
*/
typedef FT_Error
(*TT_Loader_ReadGlyphFunc)( TT_Loader loader );
/**************************************************************************
*
* @functype:
* TT_Loader_EndGlyphFunc
*
* @description:
* Closes the current loader stream frame for the glyph.
*
* @input:
* loader ::
* The current TrueType glyph loader object.
*/
typedef void
(*TT_Loader_EndGlyphFunc)( TT_Loader loader );
typedef enum TT_SbitTableType_
{
TT_SBIT_TABLE_TYPE_NONE = 0,
TT_SBIT_TABLE_TYPE_EBLC, /* `EBLC' (Microsoft), */
/* `bloc' (Apple) */
TT_SBIT_TABLE_TYPE_CBLC, /* `CBLC' (Google) */
TT_SBIT_TABLE_TYPE_SBIX, /* `sbix' (Apple) */
/* do not remove */
TT_SBIT_TABLE_TYPE_MAX
} TT_SbitTableType;
/* OpenType 1.8 brings new tables for variation font support; */
/* to make the old MM and GX fonts still work we need to check */
/* the presence (and validity) of the functionality provided */
/* by those tables. The following flag macros are for the */
/* field `variation_support'. */
/* */
/* Note that `fvar' gets checked immediately at font loading, */
/* while the other features are only loaded if MM support is */
/* actually requested. */
/* FVAR */
#define TT_FACE_FLAG_VAR_FVAR ( 1 << 0 )
/* HVAR */
#define TT_FACE_FLAG_VAR_HADVANCE ( 1 << 1 )
#define TT_FACE_FLAG_VAR_LSB ( 1 << 2 )
#define TT_FACE_FLAG_VAR_RSB ( 1 << 3 )
/* VVAR */
#define TT_FACE_FLAG_VAR_VADVANCE ( 1 << 4 )
#define TT_FACE_FLAG_VAR_TSB ( 1 << 5 )
#define TT_FACE_FLAG_VAR_BSB ( 1 << 6 )
#define TT_FACE_FLAG_VAR_VORG ( 1 << 7 )
/* MVAR */
#define TT_FACE_FLAG_VAR_MVAR ( 1 << 8 )
/**************************************************************************
*
* 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.
*
* ttc_header ::
* The TrueType collection header, used when the file is a 'ttc' rather
* than a 'ttf'. For ordinary font files, the field `ttc_header.count`
* is set to 0.
*
* format_tag ::
* The font format tag.
*
* 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.
*
* 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
* `vertical_info` 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.
*
* cmap_table ::
* Address of the face's 'cmap' SFNT table in memory (it's an extracted
* frame).
*
* cmap_size ::
* The size in bytes of the `cmap_table` described above.
*
* goto_table ::
* 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).
*
* access_glyph_frame ::
* A function used to access the frame of a given glyph within the
* face's font file.
*
* forget_glyph_frame ::
* A function used to forget the frame of a given glyph when all data
* has been loaded.
*
* read_glyph_header ::
* A function used to read a glyph header. It must be called between
* an 'access' and 'forget'.
*
* read_simple_glyph ::
* A function used to read a simple glyph. It must be called after the
* header was read, and before the 'forget'.
*
* read_composite_glyph ::
* A function used to read a composite glyph. It must be called after
* the header was read, and before the 'forget'.
*
* sfnt ::
* A pointer to the SFNT service.
*
* psnames ::
* A pointer to the PostScript names service.
*
* mm ::
* A pointer to the Multiple Masters service.
*
* var ::
* A pointer to the Metrics Variations service.
*
* 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.
*
* pclt ::
* The 'pclt' SFNT table.
*
* 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.
*
* palette_data ::
* Some fields from the 'CPAL' table that are directly indexed.
*
* palette_index ::
* The current palette index, as set by @FT_Palette_Select.
*
* palette ::
* An array containing the current palette's colors.
*
* have_foreground_color ::
* There was a call to @FT_Palette_Set_Foreground_Color.
*
* foreground_color ::
* The current foreground color corresponding to 'CPAL' color index
* 0xFFFF. Only valid if `have_foreground_color` is set.
*
* 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 ::
* The 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 (in 26.6 format). Comes from the 'cvt~'
* table. Ignored for Type 2 fonts.
*
* If varied by the `CVAR' table, non-integer values are possible.
*
* interpreter ::
* A pointer to the TrueType bytecode interpreters field is also used
* to hook the debugger in 'ttdebug'.
*
* extra ::
* Reserved for third-party font drivers.
*
* postscript_name ::
* The PS name of the font. Used by the postscript name service.
*
* glyf_len ::
* The length of the 'glyf' table. Needed for malformed 'loca' tables.
*
* glyf_offset ::
* The file offset of the 'glyf' table.
*
* is_cff2 ::
* Set if the font format is CFF2.
*
* doblend ::
* A boolean which is set if the font should be blended (this is for GX
* var).
*
* blend ::
* Contains the data needed to control GX variation tables (rather like
* Multiple Master data).
*
* variation_support ::
* Flags that indicate which OpenType functionality related to font
* variation support is present, valid, and usable. For example,
* TT_FACE_FLAG_VAR_FVAR is only set if we have at least one design
* axis.
*
* var_postscript_prefix ::
* The PostScript name prefix needed for constructing a variation font
* instance's PS name .
*
* var_postscript_prefix_len ::
* The length of the `var_postscript_prefix` string.
*
* horz_metrics_size ::
* The size of the 'hmtx' table.
*
* vert_metrics_size ::
* The size of the 'vmtx' table.
*
* 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.
*
* hdmx_table ::
* A pointer to the 'hdmx' table.
*
* hdmx_table_size ::
* The size of the 'hdmx' table.
*
* hdmx_record_count ::
* The number of hdmx records.
*
* hdmx_record_size ::
* The size of a single hdmx record.
*
* hdmx_record_sizes ::
* An array holding the ppem sizes available in the 'hdmx' table.
*
* sbit_table ::
* A pointer to the font's embedded bitmap location table.
*
* sbit_table_size ::
* The size of `sbit_table`.
*
* sbit_table_type ::
* The sbit table type (CBLC, sbix, etc.).
*
* sbit_num_strikes ::
* The number of sbit strikes exposed by FreeType's API, omitting
* invalid strikes.
*
* sbit_strike_map ::
* A mapping between the strike indices exposed by the API and the
* indices used in the font's sbit table.
*
* cpal ::
* A pointer to data related to the 'CPAL' table. `NULL` if the table
* is not available.
*
* colr ::
* A pointer to data related to the 'COLR' table. `NULL` if the table
* is not available.
*
* kern_table ::
* A pointer to the 'kern' table.
*
* kern_table_size ::
* The size of the 'kern' table.
*
* num_kern_tables ::
* The number of supported kern subtables (up to 32; FreeType
* recognizes only horizontal ones with format 0).
*
* kern_avail_bits ::
* The availability status of kern subtables; if bit n is set, table n
* is available.
*
* kern_order_bits ::
* The sortedness status of kern subtables; if bit n is set, table n is
* sorted.
*
* bdf ::
* Data related to an SFNT font's 'bdf' table; see `tttypes.h`.
*
* horz_metrics_offset ::
* The file offset of the 'hmtx' table.
*
* vert_metrics_offset ::
* The file offset of the 'vmtx' table.
*
* sph_found_func_flags ::
* Flags identifying special bytecode functions (used by the v38
* implementation of the bytecode interpreter).
*
* sph_compatibility_mode ::
* This flag is set if we are in ClearType backward compatibility mode
* (used by the v38 implementation of the bytecode interpreter).
*
* ebdt_start ::
* The file offset of the sbit data table (CBDT, bdat, etc.).
*
* ebdt_size ::
* The size of the sbit data table.
*/
typedef struct TT_FaceRec_
{
FT_FaceRec root;
TTC_HeaderRec ttc_header;
FT_ULong format_tag;
FT_UShort num_tables;
TT_Table dir_tables;
TT_Header header; /* TrueType header table */
TT_HoriHeader horizontal; /* TrueType horizontal header */
TT_MaxProfile max_profile;
FT_Bool vertical_info;
TT_VertHeader vertical; /* TT Vertical header, if present */
FT_UShort num_names; /* number of name records */
TT_NameTableRec name_table; /* name table */
TT_OS2 os2; /* TrueType OS/2 table */
TT_Postscript postscript; /* TrueType Postscript table */
FT_Byte* cmap_table; /* extracted `cmap' table */
FT_ULong cmap_size;
TT_Loader_GotoTableFunc goto_table;
TT_Loader_StartGlyphFunc access_glyph_frame;
TT_Loader_EndGlyphFunc forget_glyph_frame;
TT_Loader_ReadGlyphFunc read_glyph_header;
TT_Loader_ReadGlyphFunc read_simple_glyph;
TT_Loader_ReadGlyphFunc read_composite_glyph;
/* a typeless pointer to the SFNT_Interface table used to load */
/* the basic TrueType tables in the face object */
void* sfnt;
/* a typeless pointer to the FT_Service_PsCMapsRec table used to */
/* handle glyph names <-> unicode & Mac values */
void* psnames;
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
/* a typeless pointer to the FT_Service_MultiMasters table used to */
/* handle variation fonts */
void* mm;
/* a typeless pointer to the FT_Service_MetricsVariationsRec table */
/* used to handle the HVAR, VVAR, and MVAR OpenType tables */
void* var;
#endif
/* a typeless pointer to the PostScript Aux service */
void* psaux;
/************************************************************************
*
* Optional TrueType/OpenType tables
*
*/
/* grid-fitting and scaling table */
TT_GaspRec gasp; /* the `gasp' table */
/* PCL 5 table */
TT_PCLT pclt;
/* embedded bitmaps support */
FT_ULong num_sbit_scales;
TT_SBit_Scale sbit_scales;
/* postscript names table */
TT_Post_NamesRec postscript_names;
/* glyph colors */
FT_Palette_Data palette_data; /* since 2.10 */
FT_UShort palette_index;
FT_Color* palette;
FT_Bool have_foreground_color;
FT_Color foreground_color;
/************************************************************************
*
* TrueType-specific fields (ignored by the CFF driver)
*
*/
/* the font program, if any */
FT_ULong font_program_size;
FT_Byte* font_program;
/* the cvt program, if any */
FT_ULong cvt_program_size;
FT_Byte* cvt_program;
/* the original, unscaled, control value table */
FT_ULong cvt_size;
FT_Int32* cvt;
/* A pointer to the bytecode interpreter to use. This is also */
/* used to hook the debugger for the `ttdebug' utility. */
TT_Interpreter interpreter;
/************************************************************************
*
* Other tables or fields. This is used by derivative formats like
* OpenType.
*
*/
FT_Generic extra;
const char* postscript_name;
FT_ULong glyf_len;
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