1 /*
   2  * Copyright © 2018  Ebrahim Byagowi
   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 #ifndef HB_OT_GASP_TABLE_HH
  26 #define HB_OT_GASP_TABLE_HH
  27 
  28 #include "hb-open-type.hh"
  29 #include "hb-ot-hhea-table.hh"
  30 #include "hb-ot-os2-table.hh"
  31 #include "hb-ot-var-hvar-table.hh"
  32 
  33 /*
  34  * gasp -- Grid-fitting and Scan-conversion Procedure
  35  * https://docs.microsoft.com/en-us/typography/opentype/spec/gasp
  36  */
  37 #define HB_OT_TAG_gasp HB_TAG('g','a','s','p')
  38 
  39 
  40 namespace OT {
  41 
  42 struct GaspRange
  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   HBUINT16      rangeMaxPPEM;   /* Upper limit of range, in PPEM */
  52   HBUINT16      rangeGaspBehavior;
  53                                 /* Flags describing desired rasterizer behavior. */
  54   public:
  55   DEFINE_SIZE_STATIC (4);
  56 };
  57 
  58 struct gasp
  59 {
  60   static constexpr hb_tag_t tableTag = HB_OT_TAG_gasp;
  61 
  62   const GaspRange &get_gasp_range (unsigned int i) const
  63   { return gaspRanges[i]; }
  64 
  65   bool sanitize (hb_sanitize_context_t *c) const
  66   {
  67     TRACE_SANITIZE (this);
  68     return_trace (c->check_struct (this) &&
  69                   gaspRanges.sanitize (c));
  70   }
  71 
  72   protected:
  73   HBUINT16      version;        /* Version number (set to 1) */
  74   ArrayOf<GaspRange>
  75                 gaspRanges;     /* Number of records to follow
  76                                  * Sorted by ppem */
  77   public:
  78   DEFINE_SIZE_ARRAY (4, gaspRanges);
  79 };
  80 
  81 } /* namespace OT */
  82 
  83 
  84 #endif /* HB_OT_GASP_TABLE_HH */