gfx/harfbuzz/src/hb-ot-vorg-table.hh

   1 /*
   2  * Copyright © 2018 Adobe 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  * Adobe Author(s): Michiharu Ariza
  25  */
  26
  27 #ifndef HB_OT_VORG_TABLE_HH
  28 #define HB_OT_VORG_TABLE_HH
  29
  30 #include "hb-open-type.hh"
  31
  32 /*
  33  * VORG -- Vertical Origin Table
  34  * https://docs.microsoft.com/en-us/typography/opentype/spec/vorg
  35  */
  36 #define HB_OT_TAG_VORG HB_TAG('V','O','R','G')
  37
  38 namespace OT {
  39
  40 struct VertOriginMetric
  41 {
  42   int cmp (hb_codepoint_t g) const { return glyph.cmp (g); }
  43
  44   bool sanitize (hb_sanitize_context_t *c) const
  45   {
  46     TRACE_SANITIZE (this);
  47     return_trace (c->check_struct (this));
  48   }
  49
  50   public:
  51   HBGlyphID16   glyph;
  52   FWORD         vertOriginY;
  53
  54   public:
  55   DEFINE_SIZE_STATIC (4);
  56 };
  57
  58 struct VORG
  59 {
  60   static constexpr hb_tag_t tableTag = HB_OT_TAG_VORG;
  61
  62   bool has_data () const { return version.to_int (); }
  63
  64   int get_y_origin (hb_codepoint_t glyph) const
  65   {
  66     unsigned int i;
  67     if (!vertYOrigins.bfind (glyph, &i))
  68       return defaultVertOriginY;
  69     return vertYOrigins[i].vertOriginY;
  70   }
  71
  72   template <typename Iterator,
  73             hb_requires (hb_is_iterator (Iterator))>
  74   void serialize (hb_serialize_context_t *c,
  75                   Iterator it,
  76                   FWORD defaultVertOriginY)
  77   {
  78
  79     if (unlikely (!c->extend_min ((*this))))  return;
  80
  81     this->version.major = 1;
  82     this->version.minor = 0;
  83
  84     this->defaultVertOriginY = defaultVertOriginY;
  85     this->vertYOrigins.len = it.len ();
  86
  87     c->copy_all (it);
  88   }
  89
  90   bool subset (hb_subset_context_t *c) const
  91   {
  92     TRACE_SUBSET (this);
  93     auto *vorg_prime = c->serializer->start_embed<VORG> ();
  94     if (unlikely (!c->serializer->check_success (vorg_prime))) return_trace (false);
  95
  96     auto it =
  97     + vertYOrigins.as_array ()
  98     | hb_filter (c->plan->glyphset (), &VertOriginMetric::glyph)
  99     | hb_map ([&] (const VertOriginMetric& _)
 100               {
 101                 hb_codepoint_t new_glyph = HB_SET_VALUE_INVALID;
 102                 c->plan->new_gid_for_old_gid (_.glyph, &new_glyph);
 103
 104                 VertOriginMetric metric;
 105                 metric.glyph = new_glyph;
 106                 metric.vertOriginY = _.vertOriginY;
 107                 return metric;
 108               })
 109     ;
 110
 111     /* serialize the new table */
 112     vorg_prime->serialize (c->serializer, it, defaultVertOriginY);
 113     return_trace (true);
 114   }
 115
 116   bool sanitize (hb_sanitize_context_t *c) const
 117   {
 118     TRACE_SANITIZE (this);
 119     return_trace (c->check_struct (this) &&
 120                   hb_barrier () &&
 121                   version.major == 1 &&
 122                   vertYOrigins.sanitize (c));
 123   }
 124
 125   protected:
 126   FixedVersion<>version;        /* Version of VORG table. Set to 0x00010000u. */
 127   FWORD         defaultVertOriginY;
 128                                 /* The default vertical origin. */
 129   SortedArray16Of<VertOriginMetric>
 130                 vertYOrigins;   /* The array of vertical origins. */
 131
 132   public:
 133   DEFINE_SIZE_ARRAY(8, vertYOrigins);
 134 };
 135 } /* namespace OT */
 136
 137 #endif /* HB_OT_VORG_TABLE_HH */