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tttables.h
/***************************************************************************/ /* */ /* tttables.h */ /* */ /* Basic SFNT/TrueType tables definitions and interface */ /* (specification only). */ /* */ /* Copyright 1996-2018 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 TTTABLES_H_ #define TTTABLES_H_ #include <ft2build.h> #include FT_FREETYPE_H #ifdef FREETYPE_H #error "freetype.h of FreeType 1 has been loaded!" #error "Please fix the directory search order for header files" #error "so that freetype.h of FreeType 2 is found first." #endif FT_BEGIN_HEADER /*************************************************************************/ /* */ /* <Section> */ /* truetype_tables */ /* */ /* <Title> */ /* TrueType Tables */ /* */ /* <Abstract> */ /* TrueType specific table types and functions. */ /* */ /* <Description> */ /* This section contains definitions of some basic tables specific to */ /* TrueType and OpenType as well as some routines used to access and */ /* process them. */ /* */ /* <Order> */ /* TT_Header */ /* TT_HoriHeader */ /* TT_VertHeader */ /* TT_OS2 */ /* TT_Postscript */ /* TT_PCLT */ /* TT_MaxProfile */ /* */ /* FT_Sfnt_Tag */ /* FT_Get_Sfnt_Table */ /* FT_Load_Sfnt_Table */ /* FT_Sfnt_Table_Info */ /* */ /* FT_Get_CMap_Language_ID */ /* FT_Get_CMap_Format */ /* */ /* FT_PARAM_TAG_UNPATENTED_HINTING */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Struct> */ /* TT_Header */ /* */ /* <Description> */ /* A structure to model a TrueType font header table. All fields */ /* follow the OpenType specification. */ /* */ typedef struct TT_Header_ { FT_Fixed Table_Version; FT_Fixed Font_Revision; FT_Long CheckSum_Adjust; FT_Long Magic_Number; FT_UShort Flags; FT_UShort Units_Per_EM; FT_Long Created [2]; FT_Long Modified[2]; FT_Short xMin; FT_Short yMin; FT_Short xMax; FT_Short yMax; FT_UShort Mac_Style; FT_UShort Lowest_Rec_PPEM; FT_Short Font_Direction; FT_Short Index_To_Loc_Format; FT_Short Glyph_Data_Format; } TT_Header; /*************************************************************************/ /* */ /* <Struct> */ /* TT_HoriHeader */ /* */ /* <Description> */ /* A structure to model a TrueType horizontal header, the `hhea' */ /* table, as well as the corresponding horizontal metrics table, */ /* `hmtx'. */ /* */ /* <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. */ /* */ /* caret_Offset :: The cursor's offset for slanted fonts. */ /* */ /* Reserved :: 8~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> */ /* For an OpenType variation font, the values of the following fields */ /* can change after a call to @FT_Set_Var_Design_Coordinates (and */ /* friends) if the font contains an `MVAR' table: `caret_Slope_Rise', */ /* `caret_Slope_Run', and `caret_Offset'. */ /* */ typedef struct TT_HoriHeader_ { FT_Fixed Version; FT_Short Ascender; FT_Short Descender; FT_Short Line_Gap; FT_UShort advance_Width_Max; /* advance width maximum */ FT_Short min_Left_Side_Bearing; /* minimum left-sb */ FT_Short min_Right_Side_Bearing; /* minimum right-sb */ FT_Short xMax_Extent; /* xmax extents */ FT_Short caret_Slope_Rise; FT_Short caret_Slope_Run; FT_Short caret_Offset; FT_Short Reserved[4]; FT_Short metric_Data_Format; FT_UShort number_Of_HMetrics; /* The following fields are not defined by the OpenType specification */ /* but they are 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, */ /* `vmtx'. */ /* */ /* <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. */ /* */ /* caret_Offset :: The cursor's offset for slanted fonts. */ /* */ /* Reserved :: 8~reserved bytes. */ /* */ /* metric_Data_Format :: Always~0. */ /* */ /* number_Of_VMetrics :: 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> */ /* For an OpenType variation font, the values of the following fields */ /* can change after a call to @FT_Set_Var_Design_Coordinates (and */ /* friends) if the font contains an `MVAR' table: `Ascender', */ /* `Descender', `Line_Gap', `caret_Slope_Rise', `caret_Slope_Run', */ /* and `caret_Offset'. */ /* */ typedef struct TT_VertHeader_ { FT_Fixed Version; FT_Short Ascender; FT_Short Descender; FT_Short Line_Gap; FT_UShort advance_Height_Max; /* advance height maximum */ FT_Short min_Top_Side_Bearing; /* minimum top-sb */ FT_Short min_Bottom_Side_Bearing; /* minimum bottom-sb */ FT_Short yMax_Extent; /* ymax extents */ FT_Short caret_Slope_Rise; FT_Short caret_Slope_Run; FT_Short caret_Offset; FT_Short Reserved[4]; FT_Short metric_Data_Format; FT_UShort number_Of_VMetrics; /* The following fields are not defined by the OpenType specification */ /* but they are used to connect the metrics header to the relevant */ /* `vmtx' table. */ void* long_metrics; void* short_metrics; } TT_VertHeader; /*************************************************************************/ /* */ /* <Struct> */ /* TT_OS2 */ /* */ /* <Description> */ /* A structure to model a TrueType `OS/2' table. All fields comply */ /* to the OpenType specification. */ /* */ /* Note that we now support old Mac fonts that do not include an */ /* `OS/2' table. In this case, the `version' field is always set to */ /* 0xFFFF. */ /* */ /* <Note> */ /* For an OpenType variation font, the values of the following fields */ /* can change after a call to @FT_Set_Var_Design_Coordinates (and */ /* friends) if the font contains an `MVAR' table: `sCapHeight', */ /* `sTypoAscender', `sTypoDescender', `sTypoLineGap', `sxHeight', */ /* `usWinAscent', `usWinDescent', `yStrikeoutPosition', */ /* `yStrikeoutSize', `ySubscriptXOffset', `ySubScriptXSize', */ /* `ySubscriptYOffset', `ySubscriptYSize', `ySuperscriptXOffset', */ /* `ySuperscriptXSize', `ySuperscriptYOffset', and */ /* `ySuperscriptYSize'. */ /* */ /* Possible values for bits in the `ulUnicodeRangeX' fields are given */ /* by the @TT_UCR_XXX macros. */ /* */ typedef struct TT_OS2_ { FT_UShort version; /* 0x0001 - more or 0xFFFF */ FT_Short xAvgCharWidth; FT_UShort usWeightClass; FT_UShort usWidthClass; FT_UShort fsType; FT_Short ySubscriptXSize; FT_Short ySubscriptYSize; FT_Short ySubscriptXOffset; FT_Short ySubscriptYOffset; FT_Short ySuperscriptXSize; FT_Short ySuperscriptYSize; FT_Short ySuperscriptXOffset; FT_Short ySuperscriptYOffset; FT_Short yStrikeoutSize; FT_Short yStrikeoutPosition; FT_Short sFamilyClass; FT_Byte panose[10]; FT_ULong ulUnicodeRange1; /* Bits 0-31 */ FT_ULong ulUnicodeRange2; /* Bits 32-63 */ FT_ULong ulUnicodeRange3; /* Bits 64-95 */ FT_ULong ulUnicodeRange4; /* Bits 96-127 */ FT_Char achVendID[4]; FT_UShort fsSelection; FT_UShort usFirstCharIndex; FT_UShort usLastCharIndex; FT_Short sTypoAscender; FT_Short sTypoDescender; FT_Short sTypoLineGap; FT_UShort usWinAscent; FT_UShort usWinDescent; /* only version 1 and higher: */ FT_ULong ulCodePageRange1; /* Bits 0-31 */ FT_ULong ulCodePageRange2; /* Bits 32-63 */ /* only version 2 and higher: */ FT_Short sxHeight; FT_Short sCapHeight; FT_UShort usDefaultChar; FT_UShort usBreakChar; FT_UShort usMaxContext; /* only version 5 and higher: */ FT_UShort usLowerOpticalPointSize; /* in twips (1/20th points) */ FT_UShort usUpperOpticalPointSize; /* in twips (1/20th points) */ } TT_OS2; /*************************************************************************/ /* */ /* <Struct> */ /* TT_Postscript */ /* */ /* <Description> */ /* A structure to model a TrueType `post' table. All fields comply */ /* to the OpenType specification. This structure does not reference */ /* a font's PostScript glyph names; use @FT_Get_Glyph_Name to */ /* retrieve them. */ /* */ /* <Note> */ /* For an OpenType variation font, the values of the following fields */ /* can change after a call to @FT_Set_Var_Design_Coordinates (and */ /* friends) if the font contains an `MVAR' table: `underlinePosition' */ /* and `underlineThickness'. */ /* */ typedef struct TT_Postscript_ { FT_Fixed FormatType; FT_Fixed italicAngle; FT_Short underlinePosition; FT_Short underlineThickness; FT_ULong isFixedPitch; FT_ULong minMemType42; FT_ULong maxMemType42; FT_ULong minMemType1; FT_ULong maxMemType1; /* Glyph names follow in the `post' table, but we don't */ /* load them by default. */ } TT_Postscript; /*************************************************************************/ /* */ /* <Struct> */ /* TT_PCLT */ /* */ /* <Description> */ /* A structure to model a TrueType `PCLT' table. All fields comply */ /* to the OpenType specification. */ /* */ typedef struct TT_PCLT_ { FT_Fixed Version; FT_ULong FontNumber; FT_UShort Pitch; FT_UShort xHeight; FT_UShort Style; FT_UShort TypeFamily; FT_UShort CapHeight; FT_UShort SymbolSet; FT_Char TypeFace[16]; FT_Char CharacterComplement[8]; FT_Char FileName[6]; FT_Char StrokeWeight; FT_Char WidthType; FT_Byte SerifStyle; FT_Byte Reserved; } TT_PCLT; /*************************************************************************/ /* */ /* <Struct> */ /* TT_MaxProfile */ /* */ /* <Description> */ /* The maximum profile (`maxp') table contains many max values, which */ /* can be used to pre-allocate arrays for speeding up glyph loading */ /* and hinting. */ /* */ /* <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 */ /* `maxCompositePoints'. */ /* */ /* maxContours :: The maximum number of contours in a */ /* non-composite TrueType glyph. See also */ /* `maxCompositeContours'. */ /* */ /* maxCompositePoints :: The maximum number of points in a */ /* composite TrueType glyph. See also */ /* `maxPoints'. */ /* */ /* maxCompositeContours :: The maximum number of contours in a */ /* composite TrueType glyph. See also */ /* `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 :: The maximum number of simple (i.e., non- */ /* composite) glyphs in a composite glyph. */ /* */ /* maxComponentDepth :: The maximum nesting depth of composite */ /* glyphs. */ /* */ /* <Note> */ /* This structure is only used during font loading. */ /* */ typedef struct TT_MaxProfile_ { FT_Fixed version; FT_UShort numGlyphs; FT_UShort maxPoints; FT_UShort maxContours; FT_UShort maxCompositePoints; FT_UShort maxCompositeContours; FT_UShort maxZones; FT_UShort maxTwilightPoints; FT_UShort maxStorage; FT_UShort maxFunctionDefs; FT_UShort maxInstructionDefs; FT_UShort maxStackElements; FT_UShort maxSizeOfInstructions; FT_UShort maxComponentElements; FT_UShort maxComponentDepth; } TT_MaxProfile; /*************************************************************************/ /* */ /* <Enum> */ /* FT_Sfnt_Tag */ /* */ /* <Description> */ /* An enumeration to specify indices of SFNT tables loaded and parsed */ /* by FreeType during initialization of an SFNT font. Used in the */ /* @FT_Get_Sfnt_Table API function. */ /* */ /* <Values> */ /* FT_SFNT_HEAD :: To access the font's @TT_Header structure. */ /* */ /* FT_SFNT_MAXP :: To access the font's @TT_MaxProfile structure. */ /* */ /* FT_SFNT_OS2 :: To access the font's @TT_OS2 structure. */ /* */ /* FT_SFNT_HHEA :: To access the font's @TT_HoriHeader structure. */ /* */ /* FT_SFNT_VHEA :: To access the font's @TT_VertHeader structure. */ /* */ /* FT_SFNT_POST :: To access the font's @TT_Postscript structure. */ /* */ /* FT_SFNT_PCLT :: To access the font's @TT_PCLT structure. */ /* */ typedef enum FT_Sfnt_Tag_ { FT_SFNT_HEAD, FT_SFNT_MAXP, FT_SFNT_OS2, FT_SFNT_HHEA, FT_SFNT_VHEA, FT_SFNT_POST, FT_SFNT_PCLT, FT_SFNT_MAX } FT_Sfnt_Tag; /* these constants are deprecated; use the corresponding `FT_Sfnt_Tag' */ /* values instead */ #define ft_sfnt_head FT_SFNT_HEAD #define ft_sfnt_maxp FT_SFNT_MAXP #define ft_sfnt_os2 FT_SFNT_OS2 #define ft_sfnt_hhea FT_SFNT_HHEA #define ft_sfnt_vhea FT_SFNT_VHEA #define ft_sfnt_post FT_SFNT_POST #define ft_sfnt_pclt FT_SFNT_PCLT /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_Sfnt_Table */ /* */ /* <Description> */ /* Return a pointer to a given SFNT table stored within a face. */ /* */ /* <Input> */ /* face :: A handle to the source. */ /* */ /* tag :: The index of the SFNT table. */ /* */ /* <Return> */ /* A type-less pointer to the table. This will be NULL in case of */ /* error, or if the corresponding table was not found *OR* loaded */ /* from the file. */ /* */ /* Use a typecast according to `tag' to access the structure */ /* elements. */ /* */ /* <Note> */ /* The table is owned by the face object and disappears with it. */ /* */ /* This function is only useful to access SFNT tables that are loaded */ /* by the sfnt, truetype, and opentype drivers. See @FT_Sfnt_Tag for */ /* a list. */ /* */ /* Here an example how to access the `vhea' table: */ /* */ /* { */ /* TT_VertHeader* vert_header; */ /* */ /* */ /* vert_header = */ /* (TT_VertHeader*)FT_Get_Sfnt_Table( face, FT_SFNT_VHEA ); */ /* } */ /* */ FT_EXPORT( void* ) FT_Get_Sfnt_Table( FT_Face face, FT_Sfnt_Tag tag ); /************************************************************************** * * @function: * FT_Load_Sfnt_Table * * @description: * Load any SFNT font table into client memory. * * @input: * face :: * A handle to the source face. * * tag :: * The four-byte tag of the table to load. Use value~0 if you want * to access the whole font file. Otherwise, you can use one of the * definitions found in the @FT_TRUETYPE_TAGS_H file, or forge a new * one with @FT_MAKE_TAG. * * offset :: * The starting offset in the table (or file if tag~==~0). * * @output: * buffer :: * The target buffer address. The client must ensure that the memory * array is big enough to hold the data. * * @inout: * length :: * If the `length' parameter is NULL, try to load the whole table. * Return an error code if it fails. * * Else, if `*length' is~0, exit immediately while returning the * table's (or file) full size in it. * * Else the number of bytes to read from the table or file, from the * starting offset. * * @return: * FreeType error code. 0~means success. * * @note: * If you need to determine the table's length you should first call this * function with `*length' set to~0, as in the following example: * * { * FT_ULong length = 0; * * * error = FT_Load_Sfnt_Table( face, tag, 0, NULL, &length ); * if ( error ) { ... table does not exist ... } * * buffer = malloc( length ); * if ( buffer == NULL ) { ... not enough memory ... } * * error = FT_Load_Sfnt_Table( face, tag, 0, buffer, &length ); * if ( error ) { ... could not load table ... } * } * * Note that structures like @TT_Header or @TT_OS2 can't be used with * this function; they are limited to @FT_Get_Sfnt_Table. Reason is that * those structures depend on the processor architecture, with varying * size (e.g. 32bit vs. 64bit) or order (big endian vs. little endian). * */ FT_EXPORT( FT_Error ) FT_Load_Sfnt_Table( FT_Face face, FT_ULong tag, FT_Long offset, FT_Byte* buffer, FT_ULong* length ); /************************************************************************** * * @function: * FT_Sfnt_Table_Info * * @description: * Return information on an SFNT table. * * @input: * face :: * A handle to the source face. * * table_index :: * The index of an SFNT table. The function returns * FT_Err_Table_Missing for an invalid value. * * @inout: * tag :: * The name tag of the SFNT table. If the value is NULL, `table_index' * is ignored, and `length' returns the number of SFNT tables in the * font. * * @output: * length :: * The length of the SFNT table (or the number of SFNT tables, depending * on `tag'). * * @return: * FreeType error code. 0~means success. * * @note: * While parsing fonts, FreeType handles SFNT tables with length zero as * missing. * */ FT_EXPORT( FT_Error ) FT_Sfnt_Table_Info( FT_Face face, FT_UInt table_index, FT_ULong *tag, FT_ULong *length ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_CMap_Language_ID */ /* */ /* <Description> */ /* Return cmap language ID as specified in the OpenType standard. */ /* Definitions of language ID values are in file @FT_TRUETYPE_IDS_H. */ /* */ /* <Input> */ /* charmap :: */ /* The target charmap. */ /* */ /* <Return> */ /* The language ID of `charmap'. If `charmap' doesn't belong to an */ /* SFNT face, just return~0 as the default value. */ /* */ /* For a format~14 cmap (to access Unicode IVS), the return value is */ /* 0xFFFFFFFF. */ /* */ FT_EXPORT( FT_ULong ) FT_Get_CMap_Language_ID( FT_CharMap charmap ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_CMap_Format */ /* */ /* <Description> */ /* Return the format of an SFNT `cmap' table. */ /* */ /* <Input> */ /* charmap :: */ /* The target charmap. */ /* */ /* <Return> */ /* The format of `charmap'. If `charmap' doesn't belong to an SFNT */ /* face, return -1. */ /* */ FT_EXPORT( FT_Long ) FT_Get_CMap_Format( FT_CharMap charmap ); /* */ FT_END_HEADER #endif /* TTTABLES_H_ */ /* END */
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