hb-open-file-private.h

   1 #ifndef HB_OPEN_FILE_PRIVATE_H
   2 #define HB_OPEN_FILE_PRIVATE_H
   3
   4 /*Organization of an OpenType Font
   5   note: structs are supposely properly aligned to avoid the use of packing*/
   6
   7 #define IDX_NOT_FOUND 0xffff
   8
   9 struct tbl_rec {
  10         uint32_t tag;           /*4-byte identifier */
  11         uint32_t chk_sum;       /*Check sum for this table */
  12         uint32_t of;            /*Offset from beginning of TrueType font file */
  13         uint32_t len;           /*Length of this table */
  14 };
  15 #define ot_tbl tbl_rec
  16
  17 struct ot_fnt_face {
  18         uint32_t sfnt_ver;      /*'\0\001\0\00' if TrueType / 'OTTO' if CFF& */
  19         uint16_t tbls_n;        /*Number of tables */
  20         uint16_t search_range;  /*(Maximum power of 2 <= tbls_n) * 16 */
  21         uint16_t entry_selector;        /*Log2(maximum power of 2 <= tbls_n) */
  22         uint16_t range_shift;   /*tbls_n * 16 - search_range */
  23         struct tbl_rec tbls[1]; /*tbl_rec entries. tbls_n items. */
  24 };
  25 #define of_tbl ot_fnt_face
  26
  27 struct fixed_ver {
  28         uint16_t major;
  29         uint16_t minor;
  30 };
  31
  32 struct ttc_hdr_ver1 {
  33         uint32_t ttc_tag;       /*TrueType Collection ID string: 'ttcf' */
  34         struct fixed_ver ver;   /*Version of the TTC Header (1.0), 0x00010000 */
  35         uint32_t of_tbls_ofs[1];        /*Array of offsets to the OffsetTable for each */
  36         /*font from the beginning of the file */
  37 };
  38
  39 struct ttc_hdr {
  40         union {
  41                 struct {
  42                         uint32_t ttc_tag;       /*TrueType Collection ID string: 'ttcf' */
  43                         struct fixed_ver ver;   /*Version of the TTC Header (1.0 or 2.0), */
  44                         /* 0x00010000 or 0x00020000 */
  45                 } hdr;
  46                 struct ttc_hdr_ver1 ver1;
  47         } u;
  48 };
  49
  50 /*OpenType with Postscript outlines*/
  51 #define CFF_TAG HB_TAG('O','T','T','O')
  52 /*OpenType with TrueType outlines*/
  53 #define TRUETYPE_TAG HB_TAG( 0 , 1 , 0 , 0 )
  54 /*TrueType Collection*/
  55 #define TTC_TAG HB_TAG('t','t','c','f')
  56 /*Obsolete Apple TrueType*/
  57 #define TRUE_TAG HB_TAG('t','r','u','e')
  58 /*Obsolete Apple Type1 font in SFNT container*/
  59 #define TYP1_TAG HB_TAG('t','y','p','1')
  60
  61 struct ot_fnt_file {
  62         union {
  63                 uint32_t tag;
  64                 struct ot_fnt_face fnt_face;
  65                 struct ttc_hdr ttc_hdr;
  66         } u;
  67 };
  68
  69 struct ot_fnt_face *ot_fnt_file_get_face(struct ot_fnt_file *ot_fnt_file,
  70                                          unsigned i);
  71
  72 struct tbl_rec *ot_fnt_face_get_tbl_by_tag(struct ot_fnt_face *ot_fnt_face,
  73                                            hb_tag_t tag);
  74 #endif