gfx/harfbuzz/src/hb-subset-repacker.h

   1 /*
   2  * Copyright © 2022  Google, Inc.
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  *
  24  */
  25
  26 #ifndef HB_SUBSET_REPACKER_H
  27 #define HB_SUBSET_REPACKER_H
  28
  29 #include "hb.h"
  30
  31 HB_BEGIN_DECLS
  32
  33 #ifdef HB_EXPERIMENTAL_API
  34 /*
  35  * struct hb_link_t
  36  * width:    offsetSize in bytes
  37  * position: position of the offset field in bytes
  38  * from beginning of subtable
  39  * objidx:   index of subtable
  40  */
  41 struct hb_link_t
  42 {
  43   unsigned width;
  44   unsigned position;
  45   unsigned objidx;
  46 };
  47
  48 typedef struct hb_link_t hb_link_t;
  49
  50 /*
  51  * struct hb_object_t
  52  * head:    start of object data
  53  * tail:    end of object data
  54  * num_real_links:    num of offset field in the object
  55  * real_links:        pointer to array of offset info
  56  * num_virtual_links: num of objects that must be packed
  57  * after current object in the final serialized order
  58  * virtual_links:     array of virtual link info
  59  */
  60 struct hb_object_t
  61 {
  62   char *head;
  63   char *tail;
  64   unsigned num_real_links;
  65   hb_link_t *real_links;
  66   unsigned num_virtual_links;
  67   hb_link_t *virtual_links;
  68 };
  69
  70 typedef struct hb_object_t hb_object_t;
  71
  72 HB_EXTERN hb_blob_t*
  73 hb_subset_repack_or_fail (hb_tag_t table_tag,
  74                           hb_object_t* hb_objects,
  75                           unsigned num_hb_objs);
  76
  77 #endif
  78
  79 HB_END_DECLS
  80
  81 #endif /* HB_SUBSET_REPACKER_H */