/*

 * Copyright © 2011,2012  Google, Inc.

 *

 *  This is part of HarfBuzz, a text shaping library.

 *

 * Permission is hereby granted, without written agreement and without

 * license or royalty fees, to use, copy, modify, and distribute this

 * software and its documentation for any purpose, provided that the

 * above copyright notice and the following two paragraphs appear in

 * all copies of this software.

 *

 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR

 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES

 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN

 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

 * DAMAGE.

 *

 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,

 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS

 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO

 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 *

 * Google Author(s): Behdad Esfahbod

 */

#ifndef HB_OT_MAXP_TABLE_HH

#define HB_OT_MAXP_TABLE_HH

#include "hb-open-type.hh"

#include "hb-ot-dual.hh"

namespace OT {

/*

 * maxp -- Maximum Profile

 * https://docs.microsoft.com/en-us/typography/opentype/spec/maxp

 */

#define HB_OT_TAG_maxp HB_TAG('m','a','x','p')

#define HB_OT_TAG_MAXP HB_TAG('M','A','X','P')

struct maxpV1Tail

{

  bool sanitize (hb_sanitize_context_t *c) const

  {

    TRACE_SANITIZE (this);

    return_trace (c->check_struct (this));

  }

  HBUINT16 maxPoints;     /* Maximum points in a non-composite glyph. */

  HBUINT16 maxContours;     /* Maximum contours in a non-composite glyph. */

  HBUINT16 maxCompositePoints;    /* Maximum points in a composite glyph. */

  HBUINT16 maxCompositeContours;  /* Maximum contours in a composite glyph. */

  HBUINT16 maxZones;      /* 1 if instructions do not use the twilight zone (Z0),

           * or 2 if instructions do use Z0; should be set to 2 in

           * most cases. */

  HBUINT16 maxTwilightPoints;   /* Maximum points used in Z0. */

  HBUINT16 maxStorage;      /* Number of Storage Area locations. */

  HBUINT16 maxFunctionDefs;   /* Number of FDEFs, equal to the highest function number + 1. */

  HBUINT16 maxInstructionDefs;    /* Number of IDEFs. */

  HBUINT16 maxStackElements;    /* Maximum stack depth. (This includes Font and CVT

           * Programs, as well as the instructions for each glyph.) */

  HBUINT16 maxSizeOfInstructions; /* Maximum byte count for glyph instructions. */

  HBUINT16 maxComponentElements;  /* Maximum number of components referenced at

           * "top level" for any composite glyph. */

  HBUINT16 maxComponentDepth;   /* Maximum levels of recursion; 1 for simple components. */

 public:

  DEFINE_SIZE_STATIC (26);

};

template <typename Types>

struct maxp_MAXP

{

  unsigned int get_num_glyphs () const { return numGlyphs; }

  void set_num_glyphs (unsigned int count)

  {

    numGlyphs = count;

  }

  bool sanitize (hb_sanitize_context_t *c) const

  {

    TRACE_SANITIZE (this);

    if (unlikely (!c->check_struct (this)))

      return_trace (false);

    hb_barrier ();

    if (version.major == 1)

    {

      const maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*this);

      return_trace (v1.sanitize (c));

    }

    return_trace (likely (version.major == 0 && version.minor == 0x5000u));

  }

  bool subset (hb_subset_context_t *c) const

  {

    TRACE_SUBSET (this);

    maxp_MAXP *maxp_prime = c->serializer->embed (this);

    if (unlikely (!maxp_prime)) return_trace (false);

    maxp_prime->numGlyphs = hb_min (c->plan->num_output_glyphs (),

            (1u << (8 * Types::size)) - 1);

    if (maxp_prime->version.major == 1)

    {

      hb_barrier ();

      const maxpV1Tail *src_v1 = &StructAfter<maxpV1Tail> (*this);

      maxpV1Tail *dest_v1 = c->serializer->embed<maxpV1Tail> (src_v1);

      if (unlikely (!dest_v1)) return_trace (false);

      if (c->plan->flags & HB_SUBSET_FLAGS_NO_HINTING)

  drop_hint_fields (dest_v1);

      if (c->plan->normalized_coords)

        instancing_update_fields (c->plan->head_maxp_info, dest_v1);

    }

    return_trace (true);

  }

  void instancing_update_fields (head_maxp_info_t& maxp_info, maxpV1Tail* dest_v1) const

  {

    dest_v1->maxPoints = maxp_info.maxPoints;

    dest_v1->maxContours = maxp_info.maxContours;

    dest_v1->maxCompositePoints = maxp_info.maxCompositePoints;

    dest_v1->maxCompositeContours = maxp_info.maxCompositeContours;

    dest_v1->maxComponentElements = maxp_info.maxComponentElements;

    dest_v1->maxComponentDepth = maxp_info.maxComponentDepth;

  }

  static void drop_hint_fields (maxpV1Tail* dest_v1)

  {

    dest_v1->maxZones = 1;

    dest_v1->maxTwilightPoints = 0;

    dest_v1->maxStorage = 0;

    dest_v1->maxFunctionDefs = 0;

    dest_v1->maxInstructionDefs = 0;

    dest_v1->maxStackElements = 0;

    dest_v1->maxSizeOfInstructions = 0;

  }

  protected:

  FixedVersion<>version;/* Version of the maxp table (0.5 or 1.0),

       * 0x00005000u or 0x00010000u. */

  typename Types::HBUINT

    numGlyphs;

      /* The number of glyphs in the font. */

/*maxpV1Tail  v1Tail[HB_VAR_ARRAY]; */

  public:

  DEFINE_SIZE_STATIC (4 + Types::HBUINT::static_size);

};

struct maxp : maxp_MAXP<Layout::SmallTypes>

{

  static constexpr hb_tag_t tableTag = HB_OT_TAG_maxp;

};

struct MAXP : maxp_MAXP<Layout::MediumTypes>

{

  static constexpr hb_tag_t tableTag = HB_OT_TAG_MAXP;

};

struct maxp_accelerator_t

{

  maxp_accelerator_t ()

  {

    blob = hb_blob_get_empty ();

    numGlyphs = 0;

  }

  maxp_accelerator_t (hb_face_t *face) : maxp_accelerator_t ()

  {

#ifndef HB_NO_BEYOND_64K

    if (init_table<MAXP> (face))

      return;

#endif

    init_table<maxp> (face);

  }

  ~maxp_accelerator_t () { hb_blob_destroy (blob); }

  unsigned int get_num_glyphs () const { return numGlyphs; }

  hb_blob_t *get_blob () const { return blob; }

  private:

  template <typename Table>

  bool init_table (hb_face_t *face)

  {

    hb_sanitize_context_t c;

    c.set_num_glyphs (0);

    hb_blob_ptr_t<Table> table = c.reference_table<Table> (face);

    bool ret = table.get_length ();

    if (ret)

    {

      blob = hb_blob_reference (table.get_blob ());

      numGlyphs = table->get_num_glyphs ();

    }

    table.destroy ();

    return ret;

  }

  hb_blob_t *blob;

  unsigned int numGlyphs;

};

} /* namespace OT */

#endif /* HB_OT_MAXP_TABLE_HH */