/*

 * Copyright © 2018 Adobe 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.

 *

 * Adobe Author(s): Michiharu Ariza

 */

#ifndef HB_CFF2_INTERP_CS_HH

#define HB_CFF2_INTERP_CS_HH

#include "hb.hh"

#include "hb-cff-interp-cs-common.hh"

namespace CFF {

using namespace OT;

struct blend_arg_t : number_t

{

  void set_int (int v) { reset_blends (); number_t::set_int (v); }

  void set_fixed (int32_t v) { reset_blends (); number_t::set_fixed (v); }

  void set_real (double v) { reset_blends (); number_t::set_real (v); }

  void set_blends (unsigned int numValues_, unsigned int valueIndex_,

       hb_array_t<const blend_arg_t> blends_)

  {

    numValues = numValues_;

    valueIndex = valueIndex_;

    unsigned numBlends = blends_.length;

    if (unlikely (!deltas.resize_exact (numBlends)))

      return;

    for (unsigned int i = 0; i < numBlends; i++)

      deltas.arrayZ[i] = blends_.arrayZ[i];

  }

  bool blending () const { return deltas.length > 0; }

  void reset_blends ()

  {

    numValues = valueIndex = 0;

    deltas.shrink (0);

  }

  unsigned int numValues;

  unsigned int valueIndex;

  hb_vector_t<number_t> deltas;

};

typedef biased_subrs_t<CFF2Subrs>   cff2_biased_subrs_t;

template <typename ELEM>

struct cff2_cs_interp_env_t : cs_interp_env_t<ELEM, CFF2Subrs>

{

  template <typename ACC>

  cff2_cs_interp_env_t (const hb_ubytes_t &str, ACC &acc, unsigned int fd,

      const int *coords_=nullptr, unsigned int num_coords_=0)

    : SUPER (str, acc.globalSubrs, acc.privateDicts[fd].localSubrs),

      cached_scalars_vector (&acc.cached_scalars_vector)

  {

    coords = coords_;

    num_coords = num_coords_;

    varStore = acc.varStore;

    do_blend = num_coords && coords && varStore->size;

    set_ivs (acc.privateDicts[fd].ivs);

  }

  ~cff2_cs_interp_env_t ()

  {

    release_scalars_vector (scalars);

  }

  hb_vector_t<float> *acquire_scalars_vector () const

  {

    hb_vector_t<float> *scalars = cached_scalars_vector->get_acquire ();

    if (!scalars || !cached_scalars_vector->cmpexch (scalars, nullptr))

    {

      scalars = (hb_vector_t<float> *) hb_calloc (1, sizeof (hb_vector_t<float>));

      if (unlikely (!scalars))

  return nullptr;

      scalars->init ();

    }

    return scalars;

  }

  void release_scalars_vector (hb_vector_t<float> *scalars) const

  {

    if (!scalars)

      return;

    scalars->clear ();

    if (!cached_scalars_vector->cmpexch (nullptr, scalars))

    {

      scalars->fini ();

      hb_free (scalars);

    }

    scalars = nullptr;

  }

  op_code_t fetch_op ()

  {

    if (this->str_ref.avail ())

      return SUPER::fetch_op ();

    /* make up return or endchar op */

    if (this->callStack.is_empty ())

      return OpCode_endchar;

    else

      return OpCode_return;

  }

  const ELEM& eval_arg (unsigned int i)

  {

    return SUPER::argStack[i];

  }

  const ELEM& pop_arg ()

  {

    return SUPER::argStack.pop ();

  }

  void process_blend ()

  {

    if (!seen_blend)

    {

      scalars = acquire_scalars_vector ();

      if (unlikely (!scalars))

  SUPER::set_error ();

      else

      {

  region_count = varStore->varStore.get_region_index_count (get_ivs ());

  if (do_blend)

  {

    if (unlikely (!scalars->resize_exact (region_count)))

      SUPER::set_error ();

    else

      varStore->varStore.get_region_scalars (get_ivs (), coords, num_coords,

               &(*scalars)[0], region_count);

  }

      }

      seen_blend = true;

    }

  }

  void process_vsindex ()

  {

    unsigned int  index = SUPER::argStack.pop_uint ();

    if (unlikely (seen_vsindex () || seen_blend))

    {

     SUPER::set_error ();

    }

    else

    {

      set_ivs (index);

    }

    seen_vsindex_ = true;

  }

  unsigned int get_region_count () const { return region_count; }

  void   set_region_count (unsigned int region_count_) { region_count = region_count_; }

  unsigned int get_ivs () const { return ivs; }

  void   set_ivs (unsigned int ivs_) { ivs = ivs_; }

  bool   seen_vsindex () const { return seen_vsindex_; }

  double blend_deltas (hb_array_t<const ELEM> deltas) const

  {

    double v = 0;

    if (do_blend)

    {

      if (likely (scalars && scalars->length == deltas.length))

      {

        unsigned count = scalars->length;

  for (unsigned i = 0; i < count; i++)

    v += (double) scalars->arrayZ[i] * deltas.arrayZ[i].to_real ();

      }

    }

    return v;

  }

  bool have_coords () const { return num_coords; }

  protected:

  const int     *coords;

  unsigned int  num_coords;

  const  CFF2ItemVariationStore *varStore;

  unsigned int  region_count;

  unsigned int  ivs;

  hb_vector_t<float>  *scalars = nullptr;

  hb_atomic_t<hb_vector_t<float> *> *cached_scalars_vector = nullptr;

  bool    do_blend;

  bool    seen_vsindex_ = false;

  bool    seen_blend = false;

  typedef cs_interp_env_t<ELEM, CFF2Subrs> SUPER;

};

template <typename OPSET, typename PARAM, typename ELEM, typename PATH=path_procs_null_t<cff2_cs_interp_env_t<ELEM>, PARAM>>

struct cff2_cs_opset_t : cs_opset_t<ELEM, OPSET, cff2_cs_interp_env_t<ELEM>, PARAM, PATH>

{

  static void process_op (op_code_t op, cff2_cs_interp_env_t<ELEM> &env, PARAM& param)

  {

    switch (op) {

      case OpCode_callsubr:

      case OpCode_callgsubr:

  /* a subroutine number shouldn't be a blended value */

#if 0

  if (unlikely (env.argStack.peek ().blending ()))

  {

    env.set_error ();

    break;

  }

#endif

  SUPER::process_op (op, env, param);

  break;

      case OpCode_blendcs:

  OPSET::process_blend (env, param);

  break;

      case OpCode_vsindexcs:

#if 0

  if (unlikely (env.argStack.peek ().blending ()))

  {

    env.set_error ();

    break;

  }

#endif

  OPSET::process_vsindex (env, param);

  break;

      default:

  SUPER::process_op (op, env, param);

    }

  }

Unexecuted instantiation: CFF::cff2_cs_opset_t<cff2_cs_opset_extents_t, cff2_extents_param_t, CFF::number_t, cff2_path_procs_extents_t>::process_op(unsigned int, CFF::cff2_cs_interp_env_t<CFF::number_t>&, cff2_extents_param_t&)

Unexecuted instantiation: CFF::cff2_cs_opset_t<cff2_cs_opset_path_t, cff2_path_param_t, CFF::number_t, cff2_path_procs_path_t>::process_op(unsigned int, CFF::cff2_cs_interp_env_t<CFF::number_t>&, cff2_path_param_t&)

  template <typename T = ELEM,

      hb_enable_if (hb_is_same (T, blend_arg_t))>

  static void process_arg_blend (cff2_cs_interp_env_t<ELEM> &env,

         ELEM &arg,

         const hb_array_t<const ELEM> blends,

         unsigned n, unsigned i)

  {

    if (env.have_coords ())

      arg.set_int (round (arg.to_real () + env.blend_deltas (blends)));

    else

      arg.set_blends (n, i, blends);

  }

  template <typename T = ELEM,

      hb_enable_if (!hb_is_same (T, blend_arg_t))>

  static void process_arg_blend (cff2_cs_interp_env_t<ELEM> &env,

         ELEM &arg,

         const hb_array_t<const ELEM> blends,

         unsigned n, unsigned i)

  {

    arg.set_real (arg.to_real () + env.blend_deltas (blends));

  }

Unexecuted instantiation: _ZN3CFF15cff2_cs_opset_tI23cff2_cs_opset_extents_t20cff2_extents_param_tNS_8number_tE25cff2_path_procs_extents_tE17process_arg_blendIS3_TnPN12hb_enable_ifIXntsr10hb_is_sameIT_NS_11blend_arg_tEEE5valueEvE4typeELPv0EEEvRNS_20cff2_cs_interp_env_tIS3_EERS3_10hb_array_tIKS3_Ejj

Unexecuted instantiation: _ZN3CFF15cff2_cs_opset_tI20cff2_cs_opset_path_t17cff2_path_param_tNS_8number_tE22cff2_path_procs_path_tE17process_arg_blendIS3_TnPN12hb_enable_ifIXntsr10hb_is_sameIT_NS_11blend_arg_tEEE5valueEvE4typeELPv0EEEvRNS_20cff2_cs_interp_env_tIS3_EERS3_10hb_array_tIKS3_Ejj

  static void process_blend (cff2_cs_interp_env_t<ELEM> &env, PARAM& param)

  {

    unsigned int n, k;

    env.process_blend ();

    k = env.get_region_count ();

    n = env.argStack.pop_uint ();

    /* copy the blend values into blend array of the default values */

    unsigned int start = env.argStack.get_count () - ((k+1) * n);

    /* let an obvious error case fail, but note CFF2 spec doesn't forbid n==0 */

    if (unlikely (start > env.argStack.get_count ()))

    {

      env.set_error ();

      return;

    }

    for (unsigned int i = 0; i < n; i++)

    {

      const hb_array_t<const ELEM> blends = env.argStack.sub_array (start + n + (i * k), k);

      process_arg_blend (env, env.argStack[start + i], blends, n, i);

    }

    /* pop off blend values leaving default values now adorned with blend values */

    env.argStack.pop (k * n);

  }

Unexecuted instantiation: CFF::cff2_cs_opset_t<cff2_cs_opset_extents_t, cff2_extents_param_t, CFF::number_t, cff2_path_procs_extents_t>::process_blend(CFF::cff2_cs_interp_env_t<CFF::number_t>&, cff2_extents_param_t&)

Unexecuted instantiation: CFF::cff2_cs_opset_t<cff2_cs_opset_path_t, cff2_path_param_t, CFF::number_t, cff2_path_procs_path_t>::process_blend(CFF::cff2_cs_interp_env_t<CFF::number_t>&, cff2_path_param_t&)

  static void process_vsindex (cff2_cs_interp_env_t<ELEM> &env, PARAM& param)

  {

    env.process_vsindex ();

    env.clear_args ();

  }

Unexecuted instantiation: CFF::cff2_cs_opset_t<cff2_cs_opset_extents_t, cff2_extents_param_t, CFF::number_t, cff2_path_procs_extents_t>::process_vsindex(CFF::cff2_cs_interp_env_t<CFF::number_t>&, cff2_extents_param_t&)

Unexecuted instantiation: CFF::cff2_cs_opset_t<cff2_cs_opset_path_t, cff2_path_param_t, CFF::number_t, cff2_path_procs_path_t>::process_vsindex(CFF::cff2_cs_interp_env_t<CFF::number_t>&, cff2_path_param_t&)

  private:

  typedef cs_opset_t<ELEM, OPSET, cff2_cs_interp_env_t<ELEM>, PARAM, PATH>  SUPER;

};

template <typename OPSET, typename PARAM, typename ELEM>

using cff2_cs_interpreter_t = cs_interpreter_t<cff2_cs_interp_env_t<ELEM>, OPSET, PARAM>;

} /* namespace CFF */

#endif /* HB_CFF2_INTERP_CS_HH */