535 lines
29 KiB
C
535 lines
29 KiB
C
/***************************************************************************/
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/* */
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/* tttables.h */
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/* */
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/* Basic SFNT/TrueType tables definitions and interface */
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/* */
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/* */
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/* Copyright 1996-2000 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used */
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/* modified and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef TTTABLES_H
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#define TTTABLES_H
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#include <freetype.h>
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* TT_Header */
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/* */
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/* <Description> */
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/* A structure used to model a TrueType font header table. All */
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/* fields follow the TrueType specification. */
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/* */
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typedef struct TT_Header_
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{
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FT_Fixed Table_Version;
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FT_Fixed Font_Revision;
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FT_Long CheckSum_Adjust;
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FT_Long Magic_Number;
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FT_UShort Flags;
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FT_UShort Units_Per_EM;
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FT_Long Created [2];
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FT_Long Modified[2];
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FT_Short xMin;
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FT_Short yMin;
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FT_Short xMax;
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FT_Short yMax;
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FT_UShort Mac_Style;
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FT_UShort Lowest_Rec_PPEM;
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FT_Short Font_Direction;
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FT_Short Index_To_Loc_Format;
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FT_Short Glyph_Data_Format;
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} TT_Header;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* TT_HoriHeader */
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/* */
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/* <Description> */
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/* A structure used to model a TrueType horizontal header, the `hhea' */
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/* table, as well as the corresponding horizontal metrics table, */
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/* i.e., the `hmtx' table. */
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/* */
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/* <Fields> */
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/* Version :: The table version. */
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/* */
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/* Ascender :: The font's ascender, i.e., the distance */
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/* from the baseline to the top-most of all */
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/* glyph points found in the font. */
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/* */
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/* This value is invalid in many fonts, as */
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/* it is usually set by the font designer, */
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/* and often reflects only a portion of the */
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/* glyphs found in the font (maybe ASCII). */
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/* */
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/* You should use the `sTypoAscender' field */
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/* of the OS/2 table instead if you want */
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/* the correct one. */
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/* */
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/* Descender :: The font's descender, i.e., the distance */
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/* from the baseline to the bottom-most of */
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/* all glyph points found in the font. It */
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/* is negative. */
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/* */
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/* This value is invalid in many fonts, as */
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/* it is usually set by the font designer, */
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/* and often reflects only a portion of the */
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/* glyphs found in the font (maybe ASCII). */
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/* */
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/* You should use the `sTypoDescender' */
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/* field of the OS/2 table instead if you */
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/* want the correct one. */
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/* */
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/* Line_Gap :: The font's line gap, i.e., the distance */
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/* to add to the ascender and descender to */
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/* get the BTB, i.e., the */
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/* baseline-to-baseline distance for the */
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/* font. */
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/* */
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/* advance_Width_Max :: This field is the maximum of all advance */
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/* widths found in the font. It can be */
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/* used to compute the maximum width of an */
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/* arbitrary string of text. */
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/* */
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/* min_Left_Side_Bearing :: The minimum left side bearing of all */
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/* glyphs within the font. */
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/* */
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/* min_Right_Side_Bearing :: The minimum right side bearing of all */
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/* glyphs within the font. */
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/* */
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/* xMax_Extent :: The maximum horizontal extent (i.e., the */
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/* `width' of a glyph's bounding box) for */
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/* all glyphs in the font. */
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/* */
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/* caret_Slope_Rise :: The rise coefficient of the cursor's */
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/* slope of the cursor (slope=rise/run). */
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/* */
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/* caret_Slope_Run :: The run coefficient of the cursor's */
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/* slope. */
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/* */
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/* Reserved :: 10 reserved bytes. */
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/* */
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/* metric_Data_Format :: Always 0. */
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/* */
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/* number_Of_HMetrics :: Number of HMetrics entries in the `hmtx' */
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/* table -- this value can be smaller than */
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/* the total number of glyphs in the font. */
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/* */
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/* long_metrics :: A pointer into the `hmtx' table. */
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/* */
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/* short_metrics :: A pointer into the `hmtx' table. */
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/* */
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/* <Note> */
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/* IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should */
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/* be identical except for the names of their fields which */
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/* are different. */
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/* */
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/* This ensures that a single function in the `ttload' */
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/* module is able to read both the horizontal and vertical */
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/* headers. */
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/* */
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typedef struct TT_HoriHeader_
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{
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FT_Fixed Version;
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FT_Short Ascender;
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FT_Short Descender;
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FT_Short Line_Gap;
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FT_UShort advance_Width_Max; /* advance width maximum */
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FT_Short min_Left_Side_Bearing; /* minimum left-sb */
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FT_Short min_Right_Side_Bearing; /* minimum right-sb */
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FT_Short xMax_Extent; /* xmax extents */
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FT_Short caret_Slope_Rise;
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FT_Short caret_Slope_Run;
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FT_Short caret_Offset;
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FT_Short Reserved[4];
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FT_Short metric_Data_Format;
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FT_UShort number_Of_HMetrics;
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/* The following fields are not defined by the TrueType specification */
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/* but they're used to connect the metrics header to the relevant */
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/* `HMTX' table. */
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void* long_metrics;
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void* short_metrics;
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} TT_HoriHeader;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* TT_VertHeader */
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/* */
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/* <Description> */
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/* A structure used to model a TrueType vertical header, the `vhea' */
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/* table, as well as the corresponding vertical metrics table, i.e., */
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/* the `vmtx' table. */
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/* */
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/* <Fields> */
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/* Version :: The table version. */
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/* */
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/* Ascender :: The font's ascender, i.e., the distance */
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/* from the baseline to the top-most of */
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/* all glyph points found in the font. */
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/* */
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/* This value is invalid in many fonts, as */
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/* it is usually set by the font designer, */
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/* and often reflects only a portion of */
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/* the glyphs found in the font (maybe */
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/* ASCII). */
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/* */
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/* You should use the `sTypoAscender' */
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/* field of the OS/2 table instead if you */
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/* want the correct one. */
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/* */
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/* Descender :: The font's descender, i.e., the */
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/* distance from the baseline to the */
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/* bottom-most of all glyph points found */
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/* in the font. It is negative. */
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/* */
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/* This value is invalid in many fonts, as */
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/* it is usually set by the font designer, */
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/* and often reflects only a portion of */
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/* the glyphs found in the font (maybe */
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/* ASCII). */
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/* */
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/* You should use the `sTypoDescender' */
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/* field of the OS/2 table instead if you */
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/* want the correct one. */
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/* */
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/* Line_Gap :: The font's line gap, i.e., the distance */
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/* to add to the ascender and descender to */
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/* get the BTB, i.e., the */
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/* baseline-to-baseline distance for the */
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/* font. */
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/* */
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/* advance_Height_Max :: This field is the maximum of all */
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/* advance heights found in the font. It */
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/* can be used to compute the maximum */
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/* height of an arbitrary string of text. */
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/* */
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/* min_Top_Side_Bearing :: The minimum top side bearing of all */
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/* glyphs within the font. */
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/* */
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/* min_Bottom_Side_Bearing :: The minimum bottom side bearing of all */
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/* glyphs within the font. */
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/* */
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/* yMax_Extent :: The maximum vertical extent (i.e., the */
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/* `height' of a glyph's bounding box) for */
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/* all glyphs in the font. */
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/* */
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/* caret_Slope_Rise :: The rise coefficient of the cursor's */
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/* slope of the cursor (slope=rise/run). */
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/* */
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/* caret_Slope_Run :: The run coefficient of the cursor's */
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/* slope. */
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/* */
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/* Reserved :: 10 reserved bytes. */
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/* */
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/* metric_Data_Format :: Always 0. */
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/* */
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/* number_Of_HMetrics :: Number of VMetrics entries in the */
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/* `vmtx' table -- this value can be */
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/* smaller than the total number of glyphs */
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/* in the font. */
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/* */
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/* long_metrics :: A pointer into the `vmtx' table. */
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/* */
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/* short_metrics :: A pointer into the `vmtx' table. */
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/* */
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/* <Note> */
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/* IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should */
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/* be identical except for the names of their fields which */
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/* are different. */
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/* */
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/* This ensures that a single function in the `ttload' */
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/* module is able to read both the horizontal and vertical */
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/* headers. */
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/* */
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typedef struct TT_VertHeader_
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{
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FT_Fixed Version;
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FT_Short Ascender;
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FT_Short Descender;
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FT_Short Line_Gap;
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FT_UShort advance_Height_Max; /* advance height maximum */
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FT_Short min_Top_Side_Bearing; /* minimum left-sb or top-sb */
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FT_Short min_Bottom_Side_Bearing; /* minimum right-sb or bottom-sb */
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FT_Short yMax_Extent; /* xmax or ymax extents */
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FT_Short caret_Slope_Rise;
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FT_Short caret_Slope_Run;
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FT_Short caret_Offset;
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FT_Short Reserved[4];
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FT_Short metric_Data_Format;
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FT_UShort number_Of_VMetrics;
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/* The following fields are not defined by the TrueType specification */
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/* but they're used to connect the metrics header to the relevant */
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/* `HMTX' or `VMTX' table. */
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void* long_metrics;
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void* short_metrics;
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} TT_VertHeader;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* TT_OS2 */
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/* */
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/* <Description> */
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/* A structure used to model a TrueType OS/2 table. This is the long */
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/* table version. All fields comply to the TrueType specification. */
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/* */
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/* Note that we now support old Mac fonts which do not include an */
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/* OS/2 table. In this case, the `version' field is always set to */
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/* 0xFFFF. */
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/* */
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typedef struct TT_OS2_
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{
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FT_UShort version; /* 0x0001 - more or 0xFFFF */
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FT_Short xAvgCharWidth;
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FT_UShort usWeightClass;
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FT_UShort usWidthClass;
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FT_Short fsType;
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FT_Short ySubscriptXSize;
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FT_Short ySubscriptYSize;
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FT_Short ySubscriptXOffset;
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FT_Short ySubscriptYOffset;
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FT_Short ySuperscriptXSize;
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FT_Short ySuperscriptYSize;
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FT_Short ySuperscriptXOffset;
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FT_Short ySuperscriptYOffset;
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FT_Short yStrikeoutSize;
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FT_Short yStrikeoutPosition;
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FT_Short sFamilyClass;
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FT_Byte panose[10];
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FT_ULong ulUnicodeRange1; /* Bits 0-31 */
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FT_ULong ulUnicodeRange2; /* Bits 32-63 */
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FT_ULong ulUnicodeRange3; /* Bits 64-95 */
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FT_ULong ulUnicodeRange4; /* Bits 96-127 */
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FT_Char achVendID[4];
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FT_UShort fsSelection;
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FT_UShort usFirstCharIndex;
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FT_UShort usLastCharIndex;
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FT_Short sTypoAscender;
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FT_Short sTypoDescender;
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FT_Short sTypoLineGap;
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FT_UShort usWinAscent;
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FT_UShort usWinDescent;
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/* only version 1 tables: */
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FT_ULong ulCodePageRange1; /* Bits 0-31 */
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FT_ULong ulCodePageRange2; /* Bits 32-63 */
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/* only version 2 tables */
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FT_Short sxHeight;
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FT_Short sCapHeight;
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FT_UShort usDefaultChar;
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FT_UShort usBreakChar;
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FT_UShort usMaxContext;
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} TT_OS2;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* TT_Postscript */
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/* */
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/* <Description> */
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/* A structure used to model a TrueType Postscript table. All fields */
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/* comply to the TrueType table. This structure does not reference */
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/* the Postscript glyph names, which can be nevertheless accessed */
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/* with the `ttpost' module. */
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/* */
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typedef struct TT_Postscript_
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{
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FT_Fixed FormatType;
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FT_Fixed italicAngle;
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FT_Short underlinePosition;
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FT_Short underlineThickness;
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FT_ULong isFixedPitch;
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FT_ULong minMemType42;
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FT_ULong maxMemType42;
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FT_ULong minMemType1;
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FT_ULong maxMemType1;
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/* Glyph names follow in the file, but we don't */
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/* load them by default. See the ttpost.c file. */
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} TT_Postscript;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* TT_MaxProfile */
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/* */
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/* <Description> */
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/* The maximum profile is a table containing many max values which */
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/* can be used to pre-allocate arrays. This ensures that no memory */
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/* allocation occurs during a glyph load. */
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/* */
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/* <Fields> */
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/* version :: The version number. */
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/* */
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/* numGlyphs :: The number of glyphs in this TrueType */
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/* font. */
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/* */
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/* maxPoints :: The maximum number of points in a */
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/* non-composite TrueType glyph. See also */
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/* the structure element */
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/* `maxCompositePoints'. */
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/* */
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/* maxContours :: The maximum number of contours in a */
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/* non-composite TrueType glyph. See also */
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/* the structure element */
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/* `maxCompositeContours'. */
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/* */
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/* maxCompositePoints :: The maximum number of points in a */
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/* composite TrueType glyph. See also the */
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/* structure element `maxPoints'. */
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/* */
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/* maxCompositeContours :: The maximum number of contours in a */
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/* composite TrueType glyph. See also the */
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/* structure element `maxContours'. */
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/* */
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/* maxZones :: The maximum number of zones used for */
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/* glyph hinting. */
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/* */
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/* maxTwilightPoints :: The maximum number of points in the */
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/* twilight zone used for glyph hinting. */
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/* */
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/* maxStorage :: The maximum number of elements in the */
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/* storage area used for glyph hinting. */
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/* */
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/* maxFunctionDefs :: The maximum number of function */
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/* definitions in the TrueType bytecode for */
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/* this font. */
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/* */
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/* maxInstructionDefs :: The maximum number of instruction */
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/* definitions in the TrueType bytecode for */
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/* this font. */
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/* */
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/* maxStackElements :: The maximum number of stack elements used */
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/* during bytecode interpretation. */
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/* */
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/* maxSizeOfInstructions :: The maximum number of TrueType opcodes */
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/* used for glyph hinting. */
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/* */
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/* maxComponentElements :: An obscure value related to composite */
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/* glyphs definitions. */
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/* */
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/* maxComponentDepth :: An obscure value related to composite */
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/* glyphs definitions. Probably the maximum */
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/* number of simple glyphs in a composite. */
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/* */
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/* <Note> */
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/* This structure is only used during font loading. */
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/* */
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typedef struct TT_MaxProfile_
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{
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FT_Fixed version;
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FT_UShort numGlyphs;
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FT_UShort maxPoints;
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FT_UShort maxContours;
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FT_UShort maxCompositePoints;
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FT_UShort maxCompositeContours;
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FT_UShort maxZones;
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FT_UShort maxTwilightPoints;
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FT_UShort maxStorage;
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FT_UShort maxFunctionDefs;
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FT_UShort maxInstructionDefs;
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FT_UShort maxStackElements;
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FT_UShort maxSizeOfInstructions;
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FT_UShort maxComponentElements;
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FT_UShort maxComponentDepth;
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} TT_MaxProfile;
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typedef enum
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{
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ft_sfnt_head = 0,
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ft_sfnt_maxp = 1,
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ft_sfnt_os2 = 2,
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ft_sfnt_hhea = 3,
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ft_sfnt_vhea = 4,
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ft_sfnt_post = 5,
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sfnt_max /* don't remove */
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} FT_Sfnt_Tag;
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/* internal use only */
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typedef void* (*FT_Get_Sfnt_Table_Func)( FT_Face face, FT_Sfnt_Tag tag );
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/***************************************************************************
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*
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* <Function>
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* FT_Get_Sfnt_Table
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*
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* <Description>
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* Returns a pointer to a given SFNT table within a face.
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*
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* <Input>
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* face :: handle to source
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* tag :: index if SFNT table
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*
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* <Return>
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* type-less pointer to the table. This will be 0 in case of error, or
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* when the corresponding table was not found *OR* loaded from the file.
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*
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* <Note>
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* The table is owned by the face object, and disappears with it.
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*
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* This function is only useful to access Sfnt tables that are loaded
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* by the sfnt/truetype/opentype drivers. See FT_Sfnt_tag for a list.
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*
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* You can load any table with a different function.. XXX
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*
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***************************************************************************/
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EXPORT_DEF
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void* FT_Get_Sfnt_Table( FT_Face face,
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FT_Sfnt_Tag tag );
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#endif /* TTTABLES_H */
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