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 "ttfautohint.h"
  16
  17
  18 /* these macros convert 16bit and 32bit numbers into single bytes */
  19 /* using the byte order needed within SFNT files */
  20
  21 #define HIGH(x) (FT_Byte)(((x) & 0xFF00) >> 8)
  22 #define LOW(x) ((x) & 0x00FF)
  23
  24 #define BYTE1(x) (FT_Byte)(((x) & 0xFF000000UL) >> 24);
  25 #define BYTE2(x) (FT_Byte)(((x) & 0x00FF0000UL) >> 16);
  26 #define BYTE3(x) (FT_Byte)(((x) & 0x0000FF00UL) >> 8);
  27 #define BYTE4(x) ((x) & 0x000000FFUL);
  28
  29
  30 /* the length of a dummy `DSIG' table */
  31 #define DSIG_LEN 8
  32
  33 /* an empty slot in the table info array */
  34 #define MISSING (FT_ULong)~0
  35
  36 /* the offset to the loca table format in the `head' table */
  37 #define LOCA_FORMAT_OFFSET 51
  38
  39 /* various offsets within the `maxp' table */
  40 #define MAXP_MAX_ZONES_OFFSET 14
  41 #define MAXP_MAX_TWILIGHT_POINTS_OFFSET 16
  42 #define MAXP_MAX_STORAGE_OFFSET 18
  43 #define MAXP_MAX_FUNCTION_DEFS_OFFSET 20
  44 #define MAXP_MAX_INSTRUCTION_DEFS_OFFSET 22
  45 #define MAXP_MAX_STACK_ELEMENTS_OFFSET 24
  46 #define MAXP_MAX_INSTRUCTIONS_OFFSET 26
  47
  48 #define MAXP_LEN 32
  49
  50
  51 /* flags in composite glyph records */
  52 #define ARGS_ARE_WORDS 0x0001
  53 #define ARGS_ARE_XY_VALUES 0x0002
  54 #define WE_HAVE_A_SCALE 0x0008
  55 #define MORE_COMPONENTS 0x0020
  56 #define WE_HAVE_AN_XY_SCALE 0x0040
  57 #define WE_HAVE_A_2X2 0x0080
  58 #define WE_HAVE_INSTR 0x0100
  59
  60 /* flags in simple glyph records */
  61 #define X_SHORT_VECTOR 0x02
  62 #define Y_SHORT_VECTOR 0x04
  63 #define REPEAT 0x08
  64 #define SAME_X 0x10
  65 #define SAME_Y 0x20
  66
  67
  68 /* a single glyph */
  69 typedef struct GLYPH_
  70 {
  71   FT_ULong len;
  72   FT_Byte* buf;
  73 } GLYPH;
  74
  75 /* a representation of the data in the `glyf' table */
  76 typedef struct glyf_Data_
  77 {
  78   FT_UShort num_glyphs;
  79   GLYPH* glyphs;
  80 } glyf_Data;
  81
  82 /* an SFNT table */
  83 typedef struct SFNT_Table_ {
  84   FT_ULong tag;
  85   FT_ULong len;
  86   FT_Byte* buf; /* the table data */
  87   FT_ULong offset; /* from beginning of file */
  88   FT_ULong checksum;
  89   void* data; /* used e.g. for `glyf' table data */
  90   FT_Bool processed;
  91 } SFNT_Table;
  92
  93 /* we use indices into the SFNT table array to */
  94 /* represent table info records of the TTF header */
  95 typedef FT_ULong SFNT_Table_Info;
  96
  97 /* this structure is used to model a TTF or a subfont within a TTC */
  98 typedef struct SFNT_ {
  99   FT_Face face;
 100
 101   SFNT_Table_Info* table_infos;
 102   FT_ULong num_table_infos;
 103
 104   /* various SFNT table indices */
 105   FT_ULong glyf_idx;
 106   FT_ULong loca_idx;
 107   FT_ULong head_idx;
 108   FT_ULong maxp_idx;
 109 } SFNT;
 110
 111 /* our font object */
 112 typedef struct FONT_ {
 113   FT_Library lib;
 114
 115   FT_Byte* in_buf;
 116   size_t in_len;
 117
 118   FT_Byte* out_buf;
 119   size_t out_len;
 120
 121   SFNT* sfnts;
 122   FT_Long num_sfnts;
 123
 124   SFNT_Table* tables;
 125   FT_ULong num_tables;
 126 } FONT;
 127
 128 #endif /* __TA_H__ */
 129
 130 /* end of ta.h */