shithub: freetype+ttf2subf

Download patch

ref: ffd43a6fc86c32c6e0b406fd7bdcac0804ac2b11
parent: 680ec37326bf491a69ae5ffc968a7ac4a2ec5699
author: David Turner <[email protected]>
date: Tue Apr 25 12:09:17 EDT 2000

added a new include file to access TrueType tables
directly (e.g. OS/2, Head, HMTX and Postscript)..

git/fs: mount .git/fs: mount/attach disallowed
--- /dev/null
+++ b/include/tttables.h
@@ -1,0 +1,438 @@
+/***************************************************************************/
+/*                                                                         */
+/*  tttables.h                                                             */
+/*                                                                         */
+/*    Basic SFNT/TrueType tables definitions and interface                 */
+/*                                                                         */
+/*                                                                         */
+/*  Copyright 1996-2000 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 <freetype.h>
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Struct>                                                              */
+  /*    TT_Header                                                          */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    A structure used to model a TrueType font header table.  All       */
+  /*    fields follow the TrueType 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 used to model a TrueType horizontal header, the `hhea' */
+  /*    table, as well as the corresponding horizontal metrics table,      */
+  /*    i.e., the `hmtx' table.                                            */
+  /*                                                                       */
+  /* <Fields>                                                              */
+  /*    Version                :: The table version.                       */
+  /*                                                                       */
+  /*    Ascender               :: The font's ascender, i.e., the distance  */
+  /*                              from the baseline to the top-most of all */
+  /*                              glyph points found in the font.          */
+  /*                                                                       */
+  /*                              This value is invalid in many fonts, as  */
+  /*                              it is usually set by the font designer,  */
+  /*                              and often reflects only a portion of the */
+  /*                              glyphs found in the font (maybe ASCII).  */
+  /*                                                                       */
+  /*                              You should use the `sTypoAscender' field */
+  /*                              of the OS/2 table instead if you want    */
+  /*                              the correct one.                         */
+  /*                                                                       */
+  /*    Descender              :: The font's descender, i.e., the distance */
+  /*                              from the baseline to the bottom-most of  */
+  /*                              all glyph points found in the font.  It  */
+  /*                              is negative.                             */
+  /*                                                                       */
+  /*                              This value is invalid in many fonts, as  */
+  /*                              it is usually set by the font designer,  */
+  /*                              and often reflects only a portion of the */
+  /*                              glyphs found in the font (maybe ASCII).  */
+  /*                                                                       */
+  /*                              You should use the `sTypoDescender'      */
+  /*                              field of the OS/2 table instead if you   */
+  /*                              want the correct one.                    */
+  /*                                                                       */
+  /*    Line_Gap               :: The font's line gap, i.e., the distance  */
+  /*                              to add to the ascender and descender to  */
+  /*                              get the BTB, i.e., the                   */
+  /*                              baseline-to-baseline distance for the    */
+  /*                              font.                                    */
+  /*                                                                       */
+  /*    advance_Width_Max      :: This field is the maximum of all advance */
+  /*                              widths found in the font.  It can be     */
+  /*                              used to compute the maximum width of an  */
+  /*                              arbitrary string of text.                */
+  /*                                                                       */
+  /*    min_Left_Side_Bearing  :: The minimum left side bearing of all     */
+  /*                              glyphs within the font.                  */
+  /*                                                                       */
+  /*    min_Right_Side_Bearing :: The minimum right side bearing of all    */
+  /*                              glyphs within the font.                  */
+  /*                                                                       */
+  /*    xMax_Extent            :: The maximum horizontal extent (i.e., the */
+  /*                              `width' of a glyph's bounding box) for   */
+  /*                              all glyphs in the font.                  */
+  /*                                                                       */
+  /*    caret_Slope_Rise       :: The rise coefficient of the cursor's     */
+  /*                              slope of the cursor (slope=rise/run).    */
+  /*                                                                       */
+  /*    caret_Slope_Run        :: The run coefficient of the cursor's      */
+  /*                              slope.                                   */
+  /*                                                                       */
+  /*    Reserved               :: 10 reserved bytes.                       */
+  /*                                                                       */
+  /*    metric_Data_Format     :: Always 0.                                */
+  /*                                                                       */
+  /*    number_Of_HMetrics     :: Number of HMetrics entries in the `hmtx' */
+  /*                              table -- this value can be smaller than  */
+  /*                              the total number of glyphs in the font.  */
+  /*                                                                       */
+  /*    long_metrics           :: A pointer into the `hmtx' table.         */
+  /*                                                                       */
+  /*    short_metrics          :: A pointer into the `hmtx' table.         */
+  /*                                                                       */
+  /* <Note>                                                                */
+  /*    IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should   */
+  /*               be identical except for the names of their fields which */
+  /*               are different.                                          */
+  /*                                                                       */
+  /*               This ensures that a single function in the `ttload'     */
+  /*               module is able to read both the horizontal and vertical */
+  /*               headers.                                                */
+  /*                                                                       */
+  typedef struct  TT_HoriHeader_
+  {
+    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 TrueType specification */
+    /* but they're used to connect the metrics header to the relevant     */
+    /* `HMTX' table.                                                      */
+
+    void*      long_metrics;
+    void*      short_metrics;
+
+  } TT_HoriHeader;
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Struct>                                                              */
+  /*    TT_VertHeader                                                      */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    A structure used to model a TrueType vertical header, the `vhea'   */
+  /*    table, as well as the corresponding vertical metrics table, i.e.,  */
+  /*    the `vmtx' table.                                                  */
+  /*                                                                       */
+  /* <Fields>                                                              */
+  /*    Version                 :: The table version.                      */
+  /*                                                                       */
+  /*    Ascender                :: The font's ascender, i.e., the distance */
+  /*                               from the baseline to the top-most of    */
+  /*                               all glyph points found in the font.     */
+  /*                                                                       */
+  /*                               This value is invalid in many fonts, as */
+  /*                               it is usually set by the font designer, */
+  /*                               and often reflects only a portion of    */
+  /*                               the glyphs found in the font (maybe     */
+  /*                               ASCII).                                 */
+  /*                                                                       */
+  /*                               You should use the `sTypoAscender'      */
+  /*                               field of the OS/2 table instead if you  */
+  /*                               want the correct one.                   */
+  /*                                                                       */
+  /*    Descender               :: The font's descender, i.e., the         */
+  /*                               distance from the baseline to the       */
+  /*                               bottom-most of all glyph points found   */
+  /*                               in the font.  It is negative.           */
+  /*                                                                       */
+  /*                               This value is invalid in many fonts, as */
+  /*                               it is usually set by the font designer, */
+  /*                               and often reflects only a portion of    */
+  /*                               the glyphs found in the font (maybe     */
+  /*                               ASCII).                                 */
+  /*                                                                       */
+  /*                               You should use the `sTypoDescender'     */
+  /*                               field of the OS/2 table instead if you  */
+  /*                               want the correct one.                   */
+  /*                                                                       */
+  /*    Line_Gap                :: The font's line gap, i.e., the distance */
+  /*                               to add to the ascender and descender to */
+  /*                               get the BTB, i.e., the                  */
+  /*                               baseline-to-baseline distance for the   */
+  /*                               font.                                   */
+  /*                                                                       */
+  /*    advance_Height_Max      :: This field is the maximum of all        */
+  /*                               advance heights found in the font.  It  */
+  /*                               can be used to compute the maximum      */
+  /*                               height of an arbitrary string of text.  */
+  /*                                                                       */
+  /*    min_Top_Side_Bearing    :: The minimum top side bearing of all     */
+  /*                               glyphs within the font.                 */
+  /*                                                                       */
+  /*    min_Bottom_Side_Bearing :: The minimum bottom side bearing of all  */
+  /*                               glyphs within the font.                 */
+  /*                                                                       */
+  /*    yMax_Extent             :: The maximum vertical extent (i.e., the  */
+  /*                               `height' of a glyph's bounding box) for */
+  /*                               all glyphs in the font.                 */
+  /*                                                                       */
+  /*    caret_Slope_Rise        :: The rise coefficient of the cursor's    */
+  /*                               slope of the cursor (slope=rise/run).   */
+  /*                                                                       */
+  /*    caret_Slope_Run         :: The run coefficient of the cursor's     */
+  /*                               slope.                                  */
+  /*                                                                       */
+  /*    Reserved                :: 10 reserved bytes.                      */
+  /*                                                                       */
+  /*    metric_Data_Format      :: Always 0.                               */
+  /*                                                                       */
+  /*    number_Of_HMetrics      :: Number of VMetrics entries in the       */
+  /*                               `vmtx' table -- this value can be       */
+  /*                               smaller than the total number of glyphs */
+  /*                               in the font.                            */
+  /*                                                                       */
+  /*    long_metrics           :: A pointer into the `vmtx' table.         */
+  /*                                                                       */
+  /*    short_metrics          :: A pointer into the `vmtx' table.         */
+  /*                                                                       */
+  /* <Note>                                                                */
+  /*    IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should   */
+  /*               be identical except for the names of their fields which */
+  /*               are different.                                          */
+  /*                                                                       */
+  /*               This ensures that a single function in the `ttload'     */
+  /*               module is able to read both the horizontal and vertical */
+  /*               headers.                                                */
+  /*                                                                       */
+  typedef struct TT_VertHeader_
+  {
+    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 left-sb or top-sb       */
+    FT_Short   min_Bottom_Side_Bearing; /* minimum right-sb or bottom-sb   */
+    FT_Short   yMax_Extent;             /* xmax or 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 TrueType specification */
+    /* but they're used to connect the metrics header to the relevant     */
+    /* `HMTX' or `VMTX' table.                                            */
+
+    void*      long_metrics;
+    void*      short_metrics;
+
+  } TT_VertHeader;
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Struct>                                                              */
+  /*    TT_OS2                                                             */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    A structure used to model a TrueType OS/2 table. This is the long  */
+  /*    table version.  All fields comply to the TrueType specification.   */
+  /*                                                                       */
+  /*    Note that we now support old Mac fonts which do not include an     */
+  /*    OS/2 table.  In this case, the `version' field is always set to    */
+  /*    0xFFFF.                                                            */
+  /*                                                                       */
+  typedef struct  TT_OS2_
+  {
+    FT_UShort  version;                /* 0x0001 - more or 0xFFFF */
+    FT_Short   xAvgCharWidth;
+    FT_UShort  usWeightClass;
+    FT_UShort  usWidthClass;
+    FT_Short   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 tables: */
+
+    FT_ULong   ulCodePageRange1;       /* Bits 0-31   */
+    FT_ULong   ulCodePageRange2;       /* Bits 32-63  */
+    FT_ULong   ulCodePageRange3;       /* Bits 64-95  */
+    FT_ULong   ulCodePageRange4;       /* Bits 96-127 */
+
+  } TT_OS2;
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Struct>                                                              */
+  /*    TT_Postscript                                                      */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    A structure used to model a TrueType Postscript table.  All fields */
+  /*    comply to the TrueType table.  This structure does not reference   */
+  /*    the Postscript glyph names, which can be nevertheless accessed     */
+  /*    with the `ttpost' module.                                          */
+  /*                                                                       */
+  typedef struct  TT_Postscript_
+  {
+    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 file, but we don't   */
+    /* load them by default.  See the ttpost.c file.  */
+
+  } TT_Postscript;
+
+
+  typedef enum
+  {
+    ft_sfnt_head = 0,
+    ft_sfnt_hhea = 1,
+    ft_sfnt_vhea = 2,
+    ft_sfnt_os2  = 3,
+    ft_sfnt_post = 4,
+    
+    sfnt_max   /* don't remove */
+  
+  } FT_Sfnt_Tag;
+
+  /* internal use only */
+  typedef  void*  (*FT_Get_Sfnt_Table_Func)( FT_Face  face, FT_Sfnt_Tag tag );
+
+ /***************************************************************************
+  *
+  * <Function>
+  *    FT_Get_Sfnt_Table
+  *
+  * <Description>
+  *    Returns a pointer to a given SFNT table within a face.
+  *
+  * <Input>
+  *    face  :: handle to source
+  *    tag   :: index if SFNT table
+  *
+  * <Return>
+  *    type-less pointer to the table. This will be 0 in case of error, or
+  *    when the corresponding table was not found *OR* loaded from the file.
+  *
+  * <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/opentype drivers. See FT_Sfnt_tag for a list.
+  *
+  *    You can load any table with a different function.. XXX
+  *
+  ***************************************************************************/
+  
+  EXPORT_DEF
+  void*  FT_Get_Sfnt_Table( FT_Face      face,
+                            FT_Sfnt_Tag  tag );
+
+
+#endif /* TTTABLES_H */
+