src/ta.h

   1 /* ta.h */
   2
   3 /* written 2011 by Werner Lemberg <wl@gnu.org> */
   4
   5 #ifndef __TA_H__
   6 #define __TA_H__
   7
   8 #include <config.h>
   9
  10 #include <ft2build.h>
  11 #include FT_FREETYPE_H
  12 #include FT_TRUETYPE_TABLES_H
  13 #include FT_TRUETYPE_TAGS_H
  14
  15 #include "taloader.h"
  16 #include "talatin.h"
  17 #include "ttfautohint.h"
  18
  19
  20 /* these macros convert 16bit and 32bit numbers into single bytes */
  21 /* using the byte order needed within SFNT files */
  22
  23 #define HIGH(x) (FT_Byte)(((x) & 0xFF00) >> 8)
  24 #define LOW(x) ((x) & 0x00FF)
  25
  26 #define BYTE1(x) (FT_Byte)(((x) & 0xFF000000UL) >> 24);
  27 #define BYTE2(x) (FT_Byte)(((x) & 0x00FF0000UL) >> 16);
  28 #define BYTE3(x) (FT_Byte)(((x) & 0x0000FF00UL) >> 8);
  29 #define BYTE4(x) ((x) & 0x000000FFUL);
  30
  31
  32 /* the length of a dummy `DSIG' table */
  33 #define DSIG_LEN 8
  34
  35 /* the length of our `gasp' table */
  36 #define GASP_LEN 8
  37
  38 /* an empty slot in the table info array */
  39 #define MISSING (FT_ULong)~0
  40
  41 /* the offset to the loca table format in the `head' table */
  42 #define LOCA_FORMAT_OFFSET 51
  43
  44 /* various offsets within the `maxp' table */
  45 #define MAXP_MAX_ZONES_OFFSET 14
  46 #define MAXP_MAX_TWILIGHT_POINTS_OFFSET 16
  47 #define MAXP_MAX_STORAGE_OFFSET 18
  48 #define MAXP_MAX_FUNCTION_DEFS_OFFSET 20
  49 #define MAXP_MAX_INSTRUCTION_DEFS_OFFSET 22
  50 #define MAXP_MAX_STACK_ELEMENTS_OFFSET 24
  51 #define MAXP_MAX_INSTRUCTIONS_OFFSET 26
  52
  53 #define MAXP_LEN 32
  54
  55
  56 /* flags in composite glyph records */
  57 #define ARGS_ARE_WORDS 0x0001
  58 #define ARGS_ARE_XY_VALUES 0x0002
  59 #define WE_HAVE_A_SCALE 0x0008
  60 #define MORE_COMPONENTS 0x0020
  61 #define WE_HAVE_AN_XY_SCALE 0x0040
  62 #define WE_HAVE_A_2X2 0x0080
  63 #define WE_HAVE_INSTR 0x0100
  64
  65 /* flags in simple glyph records */
  66 #define X_SHORT_VECTOR 0x02
  67 #define Y_SHORT_VECTOR 0x04
  68 #define REPEAT 0x08
  69 #define SAME_X 0x10
  70 #define SAME_Y 0x20
  71
  72
  73 /* a single glyph */
  74 typedef struct GLYPH_
  75 {
  76   FT_ULong len1; /* number of bytes before instructions location */
  77   FT_ULong len2; /* number of bytes after instructions location; */
  78                  /* if zero, this indicates a composite glyph */
  79   FT_Byte* buf; /* extracted glyph data */
  80   FT_ULong flags_offset; /* offset to last flag in a composite glyph */
  81
  82   FT_ULong ins_len; /* number of new instructions */
  83   FT_Byte* ins_buf; /* new instruction data */
  84 } GLYPH;
  85
  86 /* a representation of the data in the `glyf' table */
  87 typedef struct glyf_Data_
  88 {
  89   FT_UShort num_glyphs;
  90   GLYPH* glyphs;
  91 } glyf_Data;
  92
  93 /* an SFNT table */
  94 typedef struct SFNT_Table_ {
  95   FT_ULong tag;
  96   FT_ULong len;
  97   FT_Byte* buf; /* the table data */
  98   FT_ULong offset; /* from beginning of file */
  99   FT_ULong checksum;
 100   void* data; /* used e.g. for `glyf' table data */
 101   FT_Bool processed;
 102 } SFNT_Table;
 103
 104 /* we use indices into the SFNT table array to */
 105 /* represent table info records of the TTF header */
 106 typedef FT_ULong SFNT_Table_Info;
 107
 108 /* this structure is used to model a TTF or a subfont within a TTC */
 109 typedef struct SFNT_ {
 110   FT_Face face;
 111
 112   SFNT_Table_Info* table_infos;
 113   FT_ULong num_table_infos;
 114
 115   /* various SFNT table indices */
 116   FT_ULong glyf_idx;
 117   FT_ULong loca_idx;
 118   FT_ULong head_idx;
 119   FT_ULong maxp_idx;
 120 } SFNT;
 121
 122 /* our font object */
 123 typedef struct FONT_ {
 124   FT_Library lib;
 125
 126   FT_Byte* in_buf;
 127   size_t in_len;
 128
 129   FT_Byte* out_buf;
 130   size_t out_len;
 131
 132   SFNT* sfnts;
 133   FT_Long num_sfnts;
 134
 135   SFNT_Table* tables;
 136   FT_ULong num_tables;
 137
 138   TA_LoaderRec loader[1]; /* the interface to the autohinter */
 139 } FONT;
 140
 141 #include "tatables.h"
 142 #include "tabytecode.h"
 143
 144 #endif /* __TA_H__ */
 145
 146 /* end of ta.h */