/*

 * Copyright © 2023  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): Garret Rieger, Qunxin Liu, Roderick Sheeter

 */

 #include "hb-ot-layout-common.hh"

#include "hb-subset-plan.hh"

 #include "hb-ot-var-common.hh"

 #include "hb-ot-layout-base-table.hh"

 #include "hb-ot-glyf-table.hh"

 #include "hb-ot-var-fvar-table.hh"

 #include "hb-ot-var-avar-table.hh"

 #include "hb-ot-cff2-table.hh"

 #ifndef HB_NO_VAR

 void

 generate_varstore_inner_maps (const hb_set_t& varidx_set,

                               unsigned subtable_count,

                               hb_vector_t<hb_inc_bimap_t> &inner_maps /* OUT */)

 {

   if (varidx_set.is_empty () || subtable_count == 0) return;

   if (unlikely (!inner_maps.resize (subtable_count))) return;

   for (unsigned idx : varidx_set)

   {

     uint16_t major = idx >> 16;

     uint16_t minor = idx & 0xFFFF;

     if (major >= subtable_count)

       continue;

     inner_maps[major].add (minor);

   }

 }

 /* Evaluate a variation-region tent at v, mirroring VarRegionAxis::evaluate

  * (invalid regions evaluate as constant 1). */

 static double

 _tent_eval (const Triple &tent, double v)

 {

   double start = tent.minimum, peak = tent.middle, end = tent.maximum;

   if (unlikely (start > peak || peak > end)) return 1.0;

   if (unlikely (start < 0.0 && end > 0.0 && peak != 0.0)) return 1.0;

   if (peak == 0.0 || v == peak) return 1.0;

   if (v <= start || end <= v) return 0.0;

   if (v < peak) return (v - start) / (peak - start);

   return (end - v) / (end - peak);

 }

 /* Range of a tent's scalar over an input interval [lo, hi]. The tent is

  * unimodal, so the extremes are at the interval endpoints, plus the peak

  * when it falls inside. */

 static void

 _tent_value_range (const Triple &tent, double lo, double hi,

                    double *tmin, double *tmax)

 {

   double a = _tent_eval (tent, lo);

   double b = _tent_eval (tent, hi);

   *tmin = hb_min (a, b);

   *tmax = hb_max (a, b);

   if (lo <= tent.middle && tent.middle <= hi)

     *tmax = hb_max (*tmax, 1.0);

 }

 /* Compute conservative reachable old-space final-coord ranges per axis for

  * avar2 partial instancing. With offset compensation, the instanced font's

  * final coordinates equal the original font's over the retained user box,

  * so the reachable range of axis i's final coordinate is the range of

  *   final_i = intermediate_i + delta_i(intermediates)

  * over the box of retained old-intermediate ranges: restricted axes span

  * their retained [a, b], free public axes [-1, +1], pinned axes sit at

  * their d_i, and hidden (private) axes at 0. Interval arithmetic over the

  * avar2 VarStore regions bounds delta_i. Mirrors fontTools'

  * _computeReachableRangesForAvar2, but computed from the original store at

  * plan time (the same quantity fontTools bounds via getExtremes on the

  * instanced store). Only constraining ranges (narrower than [-1, +1]) are

  * recorded. */

 static bool

 _compute_avar2_reachable_ranges (hb_subset_plan_t *plan,

                                  hb_array_t<const OT::AxisRecord> axes,

                                  const OT::avar *avar_table,

                                  bool detect_self_contained)

 {

   const OT::ItemVariationStore *var_store;

   const OT::DeltaSetIndexMap *varidx_map;

   if (!avar_table->get_v2_store_and_map (&var_store, &varidx_map))

     return false;

   /* Old-intermediate input box per axis. */

   hb_hashmap_t<hb_tag_t, hb_pair_t<double, double>> box;

   for (const auto &axis : axes)

   {

     hb_tag_t tag = axis.get_axis_tag ();

     double lo = -1.0, hi = +1.0;

     Triple *old_int;

     if (plan->user_axes_location.has (tag))

     {

       if (!plan->old_intermediates.has (tag, &old_int)) return false;

       lo = old_int->minimum;

       hi = old_int->maximum;

     }

     else if (axis.is_hidden ())

       lo = hi = 0.0; /* private axis: intermediate is always 0 */

     if (!box.set (tag, hb_pair (lo, hi))) return false;

   }

   hb_vector_t<hb_hashmap_t<hb_tag_t, Triple>> regions;

   if (!var_store->get_region_list ().get_var_regions (plan->axes_old_index_tag_map, regions))

     return false;

   hb_hashmap_t<hb_tag_t, unsigned> grid_pos;

   hb_vector_t<hb_vector_t<double>> grid_points;

   for (unsigned i = 0; i < axes.length; i++)

   {

     grid_pos.reset ();

     grid_points.reset ();

     hb_tag_t tag = axes[i].get_axis_tag ();

     hb_pair_t<double, double> *identity;

     if (!box.has (tag, &identity)) return false;

     /* Collect the row's active regions (non-zero delta). A varidx (or the

      * implicit identity mapping) that doesn't resolve to a real store row

      * behaves as "no variation" at runtime, so it contributes no regions;

      * this also covers a NULL VarStore. */

     hb_vector_t<hb_pair_t<int, unsigned>> active; /* (delta, region index) */

     uint32_t varidx = varidx_map->map (i);

     /* Runtime treats out-of-range delta-set indices as zero. */

     if (varidx != HB_OT_LAYOUT_NO_VARIATIONS_INDEX &&

   !var_store->has_delta_set (varidx))

       varidx = HB_OT_LAYOUT_NO_VARIATIONS_INDEX;

     if (varidx != HB_OT_LAYOUT_NO_VARIATIONS_INDEX)

     {

       unsigned outer = varidx >> 16;

       unsigned inner = varidx & 0xFFFF;

       const OT::VarData &vd = var_store->get_sub_table (outer);

       const OT::HBUINT8 *delta_bytes = vd.get_delta_bytes ();

       unsigned row_size = vd.get_row_size ();

       unsigned region_count = vd.get_region_index_count ();

       for (unsigned r = 0; r < region_count; r++)

       {

   int delta = vd.get_item_delta_fast (inner, r, delta_bytes, row_size);

   if (!delta) continue;

   unsigned region_idx = vd.get_region_index (r);

   if (region_idx >= regions.length) return false;

   active.push (hb_pair (delta, region_idx));

       }

       if (active.in_error ()) return false;

     }

     /* The delta is piecewise multilinear in the axis coordinates (each

      * region scalar is a product of independent per-axis tents), so over

      * the box its exact extremes are attained at vertices of the grid of

      * per-axis tent breakpoints. Enumerate that grid when it is small

      * (real fonts); otherwise fall back to per-region interval

      * arithmetic, which ignores correlations between regions and is

      * looser but still conservative. Mirrors fontTools'

      * VarStore.getExtremes. */

     constexpr unsigned MAX_GRID = 1u << 14;

     bool exact = true;

     double dmin = 0.0, dmax = 0.0; /* delta extremes, F2Dot14 units */

     double vmin = 0.0, vmax = 0.0; /* identity + delta extremes, coord units */

     /* Grid axes: the target axis (identity term), plus every axis a valid

      * tent of an active region references. */

     auto add_grid_axis = [&] (hb_tag_t t) -> int

     {

       unsigned *pos;

       if (grid_pos.has (t, &pos)) return (int) *pos;

       unsigned new_pos = grid_pos.get_population ();

       hb_pair_t<double, double> *input;

       double blo = -1.0, bhi = +1.0;

       if (box.has (t, &input)) { blo = input->first; bhi = input->second; }

       grid_points.push (hb_vector_t<double> ());

       if (grid_points.in_error ()) return -1;

       auto &points = grid_points[new_pos];

       points.push (blo);

       points.push (bhi);

       if (points.in_error () || !grid_pos.set (t, new_pos)) return -1;

       return (int) new_pos;

     };

     if (add_grid_axis (tag) < 0) return false;

     /* Per active region: (grid axis position, tent) for its valid tents. */

     hb_vector_t<hb_vector_t<hb_pair_t<unsigned, Triple>>> region_tents;

     for (const auto &ar : active)

     {

       region_tents.push (hb_vector_t<hb_pair_t<unsigned, Triple>> ());

       if (region_tents.in_error ()) return false;

       auto &tents = region_tents[region_tents.length - 1];

       for (const auto &_ : regions[ar.second])

       {

   const Triple &tent = _.second;

   /* Tents the runtime ignores (constant scalar 1) add no breakpoints. */

   if (tent.middle == 0.0 ||

       tent.minimum > tent.middle || tent.middle > tent.maximum ||

       (tent.minimum < 0.0 && tent.maximum > 0.0))

     continue;

   int pos = add_grid_axis (_.first);

   if (pos < 0) return false;

   auto &points = grid_points[pos];

   double blo = points[0], bhi = points[1];

   points.push (hb_clamp (tent.minimum, blo, bhi));

   points.push (hb_clamp (tent.middle, blo, bhi));

   points.push (hb_clamp (tent.maximum, blo, bhi));

   tents.push (hb_pair ((unsigned) pos, tent));

   if (points.in_error () || tents.in_error ()) return false;

       }

     }

     unsigned grid_size = 1;

     for (auto &points : grid_points)

     {

       points.qsort ([] (const double &a, const double &b) -> int

         { return a < b ? -1 : a > b ? +1 : 0; });

       unsigned n = 0;

       for (unsigned j = 0; j < points.length; j++)

   if (!n || points.arrayZ[j] != points.arrayZ[n - 1])

     points.arrayZ[n++] = points.arrayZ[j];

       points.shrink (n);

       if (grid_size > MAX_GRID / points.length) { exact = false; break; }

       grid_size *= points.length;

     }

     if (exact)

     {

       unsigned target_pos = 0; /* the target axis was added first */

       hb_vector_t<unsigned> odometer;

       if (!odometer.resize (grid_pos.get_population ())) return false;

       bool first = true;

       while (true)

       {

   double delta_sum = 0.0;

   for (unsigned r = 0; r < active.length; r++)

   {

     double scalar = 1.0;

     for (const auto &pt : region_tents[r])

     {

       double v = grid_points[pt.first][odometer[pt.first]];

       scalar *= _tent_eval (pt.second, v);

       if (scalar == 0.0) break;

     }

     delta_sum += scalar * active[r].first;

   }

   double coord = grid_points[target_pos][odometer[target_pos]];

   double value = coord + delta_sum / 16384.0;

   if (first)

   {

     dmin = dmax = delta_sum;

     vmin = vmax = value;

     first = false;

   }

   else

   {

     dmin = hb_min (dmin, delta_sum); dmax = hb_max (dmax, delta_sum);

     vmin = hb_min (vmin, value);     vmax = hb_max (vmax, value);

   }

   unsigned k = 0;

   for (; k < odometer.length; k++)

   {

     if (++odometer[k] < grid_points[k].length) break;

     odometer[k] = 0;

   }

   if (k == odometer.length) break;

       }

     }

     else

     {

       for (const auto &ar : active)

       {

   int delta = ar.first;

   double smin = 1.0, smax = 1.0;

   for (const auto &_ : regions[ar.second])

   {

     hb_pair_t<double, double> *input;

     double blo = -1.0, bhi = +1.0;

     if (box.has (_.first, &input)) { blo = input->first; bhi = input->second; }

     double tmin, tmax;

     _tent_value_range (_.second, blo, bhi, &tmin, &tmax);

     smin *= tmin;

     smax *= tmax;

     if (smax == 0.0) break;

   }

   if (delta > 0) { dmin += smin * delta; dmax += smax * delta; }

   else           { dmin += smax * delta; dmax += smin * delta; }

       }

       vmin = identity->first + dmin / 16384.0;

       vmax = identity->second + dmax / 16384.0;

     }

     /* A pinned axis whose delta is constant over the box is self-contained:

      * its final coordinate is a constant. It can be removed from fvar/avar

      * and its contribution baked into the variation tables like an ordinary

      * pin at that coordinate (in old final space). Round the delta alone

      * and add it to the exact quantized intermediate, matching the runtime

      * (map_coords_2_14) and fontTools. */

     Triple *user;

     if (detect_self_contained && dmin == dmax &&

   plan->user_axes_location.has (tag, &user) && user->is_point ())

     {

       int v_int = (int) roundf ((float) identity->first * 16384.f) +

       (int) roundf ((float) dmin);

       v_int = hb_clamp (v_int, -(1 << 14), +(1 << 14));

       if (!plan->avar2_self_contained.set (tag, v_int / 16384.0)) return false;

       continue; /* axis is dropped; no region can reference it afterwards */

     }

     /* Pad by one F2Dot14 unit against rounding differences with the

      * runtime's fixed-point evaluation. */

     double lo = hb_clamp (vmin - 1.0 / 16384.0, -1.0, +1.0);

     double hi = hb_clamp (vmax + 1.0 / 16384.0, -1.0, +1.0);

     lo = floor (lo * 16384.0) / 16384.0;

     hi = ceil (hi * 16384.0) / 16384.0;

     if (lo <= -1.0 && hi >= +1.0)

       continue; /* not constraining */

     if (!plan->avar2_reachable_ranges.set (tag, Triple (lo, hb_clamp (0.0, lo, hi), hi)))

       return false;

   }

   return true;

 }

#ifndef HB_NO_OT_FONT_CFF

 static inline hb_font_t*

 _get_hb_font_with_variations (const hb_subset_plan_t *plan)

 {

   hb_font_t *font = hb_font_create (plan->source);

   if (plan->has_avar2)

   {

     /* Under avar2, instancing applies only to the self-contained pins,

      * whose constant final coordinates the plan holds in normalized_coords.

      * Setting user-space variations would run the full avar2 mapping and

      * bake contributions that remain live in the instance's variations. */

     hb_font_set_var_coords_normalized (font, plan->normalized_coords.arrayZ,

                                        plan->normalized_coords.length);

     return font;

   }

   hb_vector_t<hb_variation_t> vars;

   if (!vars.alloc (plan->user_axes_location.get_population ())) {

     hb_font_destroy (font);

     return nullptr;

   }

   for (auto _ : plan->user_axes_location)

   {

     hb_variation_t var;

     var.tag = _.first;

     var.value = _.second.middle;

     vars.push (var);

   }

   hb_font_set_variations (font, vars.arrayZ, plan->user_axes_location.get_population ());

   return font;

 }

#endif

 template<typename ItemVarStore>

 void

 remap_variation_indices (const ItemVarStore &var_store,

                          const hb_set_t &variation_indices,

                          const hb_vector_t<int>& normalized_coords,

                          bool calculate_delta, /* not pinned at default */

                          bool no_variations, /* all axes pinned */

                          hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> &variation_idx_delta_map /* OUT */)

 {

   if (&var_store == &Null (OT::ItemVariationStore)) return;

   unsigned subtable_count = var_store.get_sub_table_count ();

   auto *store_cache = var_store.create_cache ();

   unsigned new_major = 0, new_minor = 0;

   unsigned last_major = (variation_indices.get_min ()) >> 16;

   for (unsigned idx : variation_indices)

   {

     int delta = 0;

     if (calculate_delta)

       delta = roundf (var_store.get_delta (idx, normalized_coords.arrayZ,

                                            normalized_coords.length, store_cache));

     if (no_variations)

     {

       variation_idx_delta_map.set (idx, hb_pair_t<unsigned, int> (HB_OT_LAYOUT_NO_VARIATIONS_INDEX, delta));

       continue;

     }

     uint16_t major = idx >> 16;

     if (major >= subtable_count) break;

     if (major != last_major)

     {

       new_minor = 0;

       ++new_major;

     }

     unsigned new_idx = (new_major << 16) + new_minor;

     variation_idx_delta_map.set (idx, hb_pair_t<unsigned, int> (new_idx, delta));

     ++new_minor;

     last_major = major;

   }

   var_store.destroy_cache (store_cache);

 }

 template

 void

 remap_variation_indices<OT::ItemVariationStore> (const OT::ItemVariationStore &var_store,

                          const hb_set_t &variation_indices,

                          const hb_vector_t<int>& normalized_coords,

                          bool calculate_delta, /* not pinned at default */

                          bool no_variations, /* all axes pinned */

                          hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> &variation_idx_delta_map /* OUT */);

 #ifndef HB_NO_BASE

 void

 collect_base_variation_indices (hb_subset_plan_t* plan)

 {

   hb_blob_ptr_t<OT::BASE> base = plan->source_table<OT::BASE> ();

   if (!base->has_var_store ())

   {

     base.destroy ();

     return;

   }

   hb_set_t varidx_set;

   base->collect_variation_indices (plan, varidx_set);

   const OT::ItemVariationStore &var_store = base->get_var_store ();

   unsigned subtable_count = var_store.get_sub_table_count ();

   remap_variation_indices (var_store, varidx_set,

                             plan->normalized_coords,

                             !plan->pinned_at_default,

                             plan->all_axes_pinned,

                             plan->base_variation_idx_map);

   generate_varstore_inner_maps (varidx_set, subtable_count, plan->base_varstore_inner_maps);

   base.destroy ();

 }

 #endif

bool

normalize_axes_location (hb_face_t *face, hb_subset_plan_t *plan)

{

  if (plan->user_axes_location.is_empty ())

    return true;

  hb_array_t<const OT::AxisRecord> axes = face->table.fvar->get_axes ();

  if (!plan->check_success (plan->normalized_coords.resize (axes.length)))

    return false;

  bool has_avar = face->table.avar->has_data ();

  hb_vector_t<float> normalized_mins;

  hb_vector_t<float> normalized_defaults;

  hb_vector_t<float> normalized_maxs;

  if (has_avar)

  {

    if (!plan->check_success (normalized_mins.resize (axes.length)) ||

        !plan->check_success (normalized_defaults.resize (axes.length)) ||

        !plan->check_success (normalized_maxs.resize (axes.length)))

      return false;

  }

  bool axis_not_pinned = false;

  unsigned new_axis_idx = 0;

  unsigned last_idx = 0;

  for (const auto& _ : + hb_enumerate (axes))

  {

    unsigned i = _.first;

    const OT::AxisRecord &axis = _.second;

    hb_tag_t axis_tag = axis.get_axis_tag ();

    plan->axes_old_index_tag_map.set (i, axis_tag);

    if (!plan->user_axes_location.has (axis_tag) ||

        !plan->user_axes_location.get (axis_tag).is_point ())

    {

      axis_not_pinned = true;

      plan->axes_index_map.set (i, new_axis_idx);

      plan->axis_tags.push (axis_tag);

      new_axis_idx++;

    }

    Triple *axis_range;

    if (plan->user_axes_location.has (axis_tag, &axis_range))

    {

      plan->axes_triple_distances.set (axis_tag, axis.get_triple_distances ());

      float normalized_min = axis.normalize_axis_value (axis_range->minimum);

      float normalized_default = axis.normalize_axis_value (axis_range->middle);

      float normalized_max = axis.normalize_axis_value (axis_range->maximum);

      // TODO(behdad): Spec says axis normalization should be done in 16.16;

      // We used to do it in 2.14, but that's not correct.  I fixed this in

      // the fvar/avar code, but keeping 2.14 here for now to keep tests

      // happy. We might need to adjust fonttools as well.

      // I'm only fairly confident in the above statement. Anyway,

      // we should look deeper into this, and also update fonttools if

      // needed.

      // Round to 2.14

      normalized_min = roundf (normalized_min * 16384.f) / 16384.f;

      normalized_default = roundf (normalized_default * 16384.f) / 16384.f;

      normalized_max = roundf (normalized_max * 16384.f) / 16384.f;

      if (has_avar)

      {

        normalized_mins[i] = normalized_min;

        normalized_defaults[i] = normalized_default;

        normalized_maxs[i] = normalized_max;

        last_idx = i;

      }

      else

      {

        plan->axes_location.set (axis_tag, Triple ((double) normalized_min,

                                                   (double) normalized_default,

                                                   (double) normalized_max));

        if (normalized_default == -0.f)

          normalized_default = 0.f; // Normalize -0 to 0

        if (normalized_default != 0.f)

          plan->pinned_at_default = false;

        plan->normalized_coords[i] = roundf (normalized_default * 16384.f);

      }

    }

  }

  plan->all_axes_pinned = !axis_not_pinned;

  // TODO: use avar map_coords_16_16() when normalization is changed to 16.16

  // in fonttools

  if (has_avar)

  {

    const OT::avar* avar_table = face->table.avar;

    unsigned coords_len = last_idx + 1;

    if (avar_table->has_v2_data () && !plan->all_axes_pinned)

    {

      /* avar2 partial instancing: use v1-only mapping to get intermediate-space

       * coords. These are used for IVS rebasing and offset compensation. */

      plan->has_avar2 = true;

      if (!plan->check_success (avar_table->map_coords_2_14 (normalized_mins.arrayZ, coords_len, true)) ||

          !plan->check_success (avar_table->map_coords_2_14 (normalized_defaults.arrayZ, coords_len, true)) ||

          !plan->check_success (avar_table->map_coords_2_14 (normalized_maxs.arrayZ, coords_len, true)))

        return false;

      for (const auto& _ : + hb_enumerate (axes))

      {

        unsigned i = _.first;

        hb_tag_t axis_tag = _.second.get_axis_tag ();

        if (plan->user_axes_location.has (axis_tag))

        {

          /* Store intermediate-space coords for offset compensation,

           * segment-map renormalization, and IVS rebasing. */

          plan->old_intermediates.set (axis_tag, Triple ((double) normalized_mins[i],

                                                         (double) normalized_defaults[i],

                                                         (double) normalized_maxs[i]));

        }

      }

      /* Reachable-range computation also detects self-contained pinned

       * axes: pinned axes whose final coordinate is constant. Those are

       * removed from fvar, so suppress the detection when the face has

       * tables that cannot follow: CFF2 has no partial-pin instancing path

       * (its 'pinned' path flattens ALL blends; lift this once

       * https://github.com/harfbuzz/harfbuzz/pull/4710 lands, porting

       * fontTools' instantiateCFF2 from

       * https://github.com/fonttools/fonttools/pull/3506), and VARC passes

       * through verbatim with explicit fvar axis indices that renumbering

       * would desynchronize. Such axes stay in fvar as ordinary hidden

       * pins. */

      bool detect_self_contained = true;

      for (hb_tag_t table_tag : { HB_TAG ('C','F','F','2'), HB_TAG ('V','A','R','C') })

      {

        hb_blob_t *blob = hb_face_reference_table (face, table_tag);

        if (hb_blob_get_length (blob))

          detect_self_contained = false;

        hb_blob_destroy (blob);

      }

      if (!_compute_avar2_reachable_ranges (plan, axes, avar_table,

                                            detect_self_contained))

        return false;

      /* Keep all axes in fvar (pinned ones as hidden), EXCEPT self-contained

       * pinned axes, which are removed entirely. */

      plan->axes_index_map.reset ();

      plan->axis_tags.reset ();

      unsigned retained_axis_idx = 0;

      for (const auto& _ : + hb_enumerate (axes))

      {

        unsigned i = _.first;

        hb_tag_t axis_tag = _.second.get_axis_tag ();

        if (plan->avar2_self_contained.has (axis_tag))

          continue;

        plan->axes_index_map.set (i, retained_axis_idx++);

        plan->axis_tags.push (axis_tag);

      }

      /* The other tables see ONLY the self-contained pins, as an ordinary

       * partial instancing in old final-coordinate space; the standard

       * instancing machinery bakes those axes' contributions in. The

       * remaining restriction is carried entirely by avar. */

      plan->axes_location.reset ();

      if (plan->avar2_self_contained.get_population ())

      {

        bool sc_pinned_at_default = true;

        for (auto _ : plan->avar2_self_contained)

        {

          plan->axes_location.set (_.first, Triple (_.second, _.second, _.second));

          if (_.second != 0.0)

            sc_pinned_at_default = false;

        }

        for (const auto& _ : + hb_enumerate (axes))

        {

          double *v;

          plan->normalized_coords[_.first] =

              plan->avar2_self_contained.has (_.second.get_axis_tag (), &v)

              ? (int) roundf ((float) (*v * 16384.0)) : 0;

        }

        plan->pinned_at_default = sc_pinned_at_default;

      }

      else

        plan->normalized_coords.shrink (0);

    }

    else

    {

      /* Standard avar v1 (or v1+v2 with all axes pinned) */

      if (!plan->check_success (avar_table->map_coords_2_14 (normalized_mins.arrayZ, coords_len)) ||

          !plan->check_success (avar_table->map_coords_2_14 (normalized_defaults.arrayZ, coords_len)) ||

          !plan->check_success (avar_table->map_coords_2_14 (normalized_maxs.arrayZ, coords_len)))

        return false;

      for (const auto& _ : + hb_enumerate (axes))

      {

        unsigned i = _.first;

        hb_tag_t axis_tag = _.second.get_axis_tag ();

        if (plan->user_axes_location.has (axis_tag))

        {

          plan->axes_location.set (axis_tag, Triple ((double) normalized_mins[i],

                                                     (double) normalized_defaults[i],

                                                     (double) normalized_maxs[i]));

          float normalized_default = normalized_defaults[i];

          if (normalized_default == -0.f)

            normalized_default = 0.f;

          if (normalized_default != 0.f)

            plan->pinned_at_default = false;

          plan->normalized_coords[i] = roundf (normalized_default * 16384.f);

        }

      }

    }

  }

  return true;

}

#ifndef HB_NO_OT_FONT_CFF

void

update_instance_metrics_map_from_cff2 (hb_subset_plan_t *plan)

{

  if (!plan->normalized_coords) return;

  OT::cff2::accelerator_t cff2 (plan->source);

  if (!cff2.is_valid ()) return;

  hb_font_t *font = _get_hb_font_with_variations (plan);

  if (unlikely (!plan->check_success (font != nullptr)))

  {

    hb_font_destroy (font);

    return;

  }

  hb_glyph_extents_t extents = {0x7FFF, -0x7FFF};

  OT::hmtx_accelerator_t _hmtx (plan->source);

  OT::hb_scalar_cache_t *hvar_store_cache = nullptr;

  if (_hmtx.has_data () && _hmtx.var_table.get_length ())

    hvar_store_cache = _hmtx.var_table->get_var_store ().create_cache ();

  OT::vmtx_accelerator_t _vmtx (plan->source);

  OT::hb_scalar_cache_t *vvar_store_cache = nullptr;

  if (_vmtx.has_data () && _vmtx.var_table.get_length ())

    vvar_store_cache = _vmtx.var_table->get_var_store ().create_cache ();

  for (auto p : *plan->glyph_map)

  {

    hb_codepoint_t old_gid = p.first;

    hb_codepoint_t new_gid = p.second;

    if (!cff2.get_extents (font, old_gid, &extents)) continue;

    bool has_bounds_info = true;

    if (extents.x_bearing == 0 && extents.width == 0 &&

        extents.height == 0 && extents.y_bearing == 0)

      has_bounds_info = false;

    if (has_bounds_info)

    {

      plan->head_maxp_info.xMin = hb_min (plan->head_maxp_info.xMin, extents.x_bearing);

      plan->head_maxp_info.xMax = hb_max (plan->head_maxp_info.xMax,

             hb_saturate_add (extents.x_bearing, extents.width));

      plan->head_maxp_info.yMax = hb_max (plan->head_maxp_info.yMax, extents.y_bearing);

      plan->head_maxp_info.yMin = hb_min (plan->head_maxp_info.yMin,

             hb_saturate_add (extents.y_bearing, extents.height));

    }

    if (_hmtx.has_data ())

    {

      double hori_aw = _hmtx.get_advance_without_var_unscaled (old_gid);

      if (_hmtx.var_table.get_length ())

        hori_aw += (double) roundf (_hmtx.var_table->get_advance_delta_unscaled (old_gid, font->coords, font->num_coords,

                   hvar_store_cache));

      /* Malicious deltas can take the advance out of the UFWORD range that

       * hmtx serialization stores.  Clamp, to keep downstream consumers

       * (e.g. CFF width optimizer) bounded and consistent with hmtx. */

      hori_aw = hb_clamp (hori_aw, 0., 65535.);

      int lsb = extents.x_bearing;

      if (!has_bounds_info)

      {

        _hmtx.get_leading_bearing_without_var_unscaled (old_gid, &lsb);

      }

      plan->hmtx_map.set (new_gid, hb_pair ((unsigned) hori_aw, lsb));

      plan->bounds_width_vec[new_gid] = extents.width;

    }

    if (_vmtx.has_data ())

    {

      double vert_aw = _vmtx.get_advance_without_var_unscaled (old_gid);

      if (_vmtx.var_table.get_length ())

        vert_aw += (double) roundf (_vmtx.var_table->get_advance_delta_unscaled (old_gid, font->coords, font->num_coords,

                   vvar_store_cache));

      vert_aw = hb_clamp (vert_aw, 0., 65535.);

      hb_position_t vorg_x = 0;

      hb_position_t vorg_y = 0;

      int tsb = 0;

      if (has_bounds_info &&

           hb_font_get_glyph_v_origin (font, old_gid, &vorg_x, &vorg_y))

      {

        tsb = hb_saturate_sub (vorg_y, extents.y_bearing);

      } else {

        _vmtx.get_leading_bearing_without_var_unscaled (old_gid, &tsb);

      }

      plan->vmtx_map.set (new_gid, hb_pair ((unsigned) vert_aw, tsb));

      plan->bounds_height_vec[new_gid] = extents.height;

    }

  }

  hb_font_destroy (font);

  if (hvar_store_cache)

    _hmtx.var_table->get_var_store ().destroy_cache (hvar_store_cache);

  if (vvar_store_cache)

    _vmtx.var_table->get_var_store ().destroy_cache (vvar_store_cache);

}

#endif

bool

get_instance_glyphs_contour_points (hb_subset_plan_t *plan)

{

  /* contour_points vector only needed for updating gvar table (infer delta and

   * iup delta optimization) during partial instancing */

  if (plan->user_axes_location.is_empty () || plan->all_axes_pinned)

    return true;

  OT::glyf_accelerator_t glyf (plan->source);

  for (auto &_ : plan->new_to_old_gid_list)

  {

    hb_codepoint_t new_gid = _.first;

    contour_point_vector_t all_points;

    if (new_gid == 0 && !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE))

    {

      if (unlikely (!plan->new_gid_contour_points_map.set (new_gid, all_points)))

        return false;

      continue;

    }

    hb_codepoint_t old_gid = _.second;

    auto glyph = glyf.glyph_for_gid (old_gid);

    if (unlikely (!glyph.get_all_points_without_var (plan->source, all_points)))

      return false;

    if (unlikely (!plan->new_gid_contour_points_map.set (new_gid, all_points)))

      return false;

    /* composite new gids are only needed by iup delta optimization */

    if ((plan->flags & HB_SUBSET_FLAGS_OPTIMIZE_IUP_DELTAS) && glyph.is_composite ())

      plan->composite_new_gids.add (new_gid);

  }

  return true;

}

template<typename DeltaSetIndexMap>

void

remap_colrv1_delta_set_index_indices (const DeltaSetIndexMap &index_map,

                                      const hb_set_t &delta_set_idxes,

                                      hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> &variation_idx_delta_map, /* IN/OUT */

                                      hb_map_t &new_deltaset_idx_varidx_map /* OUT */)

{

  if (!index_map.get_map_count ())

    return;

  hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> delta_set_idx_delta_map;

  unsigned new_delta_set_idx = 0;

  for (unsigned delta_set_idx : delta_set_idxes)

  {

    unsigned var_idx = index_map.map (delta_set_idx);

    unsigned new_varidx = HB_OT_LAYOUT_NO_VARIATIONS_INDEX;

    int delta = 0;

    if (var_idx != HB_OT_LAYOUT_NO_VARIATIONS_INDEX)

    {

      hb_pair_t<unsigned, int> *new_varidx_delta;

      if (!variation_idx_delta_map.has (var_idx, &new_varidx_delta)) continue;

      new_varidx = hb_first (*new_varidx_delta);

      delta = hb_second (*new_varidx_delta);

    }

    new_deltaset_idx_varidx_map.set (new_delta_set_idx, new_varidx);

    delta_set_idx_delta_map.set (delta_set_idx, hb_pair_t<unsigned, int> (new_delta_set_idx, delta));

    new_delta_set_idx++;

  }

  variation_idx_delta_map = std::move (delta_set_idx_delta_map);

}

template void

remap_colrv1_delta_set_index_indices<OT::DeltaSetIndexMap> (const OT::DeltaSetIndexMap &index_map,

                                      const hb_set_t &delta_set_idxes,

                                      hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> &variation_idx_delta_map, /* IN/OUT */

                                      hb_map_t &new_deltaset_idx_varidx_map /* OUT */);

 #endif