1 /*
   2  * Copyright © 2018  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  * Google Author(s): Garret Rieger, Roderick Sheeter
  25  */
  26 
  27 #ifndef HB_SUBSET_PLAN_HH
  28 #define HB_SUBSET_PLAN_HH
  29 
  30 #include "hb.hh"
  31 
  32 #include "hb-subset.h"
  33 #include "hb-subset-input.hh"
  34 
  35 #include "hb-map.hh"
  36 
  37 struct hb_subset_plan_t
  38 {
  39   hb_object_header_t header;
  40 
  41   bool drop_hints : 1;
  42   bool drop_layout : 1;
  43   bool desubroutinize : 1;
  44 
  45   // For each cp that we'd like to retain maps to the corresponding gid.
  46   hb_set_t *unicodes;
  47 
  48   hb_vector_t<hb_codepoint_t> glyphs;
  49   hb_set_t *glyphset;
  50 
  51   hb_map_t *codepoint_to_glyph;
  52   hb_map_t *glyph_map;
  53 
  54   // Plan is only good for a specific source/dest so keep them with it
  55   hb_face_t *source;
  56   hb_face_t *dest;
  57 
  58   bool new_gid_for_codepoint (hb_codepoint_t codepoint,
  59                               hb_codepoint_t *new_gid) const
  60   {
  61     hb_codepoint_t old_gid = codepoint_to_glyph->get (codepoint);
  62     if (old_gid == HB_MAP_VALUE_INVALID)
  63       return false;
  64 
  65     return new_gid_for_old_gid (old_gid, new_gid);
  66   }
  67 
  68   bool new_gid_for_old_gid (hb_codepoint_t old_gid,
  69                             hb_codepoint_t *new_gid) const
  70   {
  71     hb_codepoint_t gid = glyph_map->get (old_gid);
  72     if (gid == HB_MAP_VALUE_INVALID)
  73       return false;
  74 
  75     *new_gid = gid;
  76     return true;
  77   }
  78 
  79   bool
  80   add_table (hb_tag_t tag,
  81              hb_blob_t *contents)
  82   {
  83     hb_blob_t *source_blob = source->reference_table (tag);
  84     DEBUG_MSG(SUBSET, nullptr, "add table %c%c%c%c, dest %d bytes, source %d bytes",
  85               HB_UNTAG(tag),
  86               hb_blob_get_length (contents),
  87               hb_blob_get_length (source_blob));
  88     hb_blob_destroy (source_blob);
  89     return hb_face_builder_add_table (dest, tag, contents);
  90   }
  91 };
  92 
  93 typedef struct hb_subset_plan_t hb_subset_plan_t;
  94 
  95 HB_INTERNAL hb_subset_plan_t *
  96 hb_subset_plan_create (hb_face_t           *face,
  97                        hb_subset_input_t   *input);
  98 
  99 HB_INTERNAL void
 100 hb_subset_plan_destroy (hb_subset_plan_t *plan);
 101 
 102 #endif /* HB_SUBSET_PLAN_HH */