| /* |
| * Copyright © 2021 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. |
| * |
| */ |
| |
| #ifndef HB_OT_VAR_COMMON_HH |
| #define HB_OT_VAR_COMMON_HH |
| |
| #include "hb-ot-layout-common.hh" |
| |
| |
| namespace OT { |
| |
| template <typename MapCountT> |
| struct DeltaSetIndexMapFormat01 |
| { |
| friend struct DeltaSetIndexMap; |
| |
| unsigned get_size () const |
| { return min_size + mapCount * get_width (); } |
| |
| private: |
| DeltaSetIndexMapFormat01* copy (hb_serialize_context_t *c) const |
| { |
| TRACE_SERIALIZE (this); |
| return_trace (c->embed (this)); |
| } |
| |
| template <typename T> |
| bool serialize (hb_serialize_context_t *c, const T &plan) |
| { |
| unsigned int width = plan.get_width (); |
| unsigned int inner_bit_count = plan.get_inner_bit_count (); |
| const hb_array_t<const uint32_t> output_map = plan.get_output_map (); |
| |
| TRACE_SERIALIZE (this); |
| if (unlikely (output_map.length && ((((inner_bit_count-1)&~0xF)!=0) || (((width-1)&~0x3)!=0)))) |
| return_trace (false); |
| if (unlikely (!c->extend_min (this))) return_trace (false); |
| |
| entryFormat = ((width-1)<<4)|(inner_bit_count-1); |
| mapCount = output_map.length; |
| HBUINT8 *p = c->allocate_size<HBUINT8> (width * output_map.length); |
| if (unlikely (!p)) return_trace (false); |
| for (unsigned int i = 0; i < output_map.length; i++) |
| { |
| unsigned int v = output_map.arrayZ[i]; |
| if (v) |
| { |
| unsigned int outer = v >> 16; |
| unsigned int inner = v & 0xFFFF; |
| unsigned int u = (outer << inner_bit_count) | inner; |
| for (unsigned int w = width; w > 0;) |
| { |
| p[--w] = u; |
| u >>= 8; |
| } |
| } |
| p += width; |
| } |
| return_trace (true); |
| } |
| |
| uint32_t map (unsigned int v) const /* Returns 16.16 outer.inner. */ |
| { |
| /* If count is zero, pass value unchanged. This takes |
| * care of direct mapping for advance map. */ |
| if (!mapCount) |
| return v; |
| |
| if (v >= mapCount) |
| v = mapCount - 1; |
| |
| unsigned int u = 0; |
| { /* Fetch it. */ |
| unsigned int w = get_width (); |
| const HBUINT8 *p = mapDataZ.arrayZ + w * v; |
| for (; w; w--) |
| u = (u << 8) + *p++; |
| } |
| |
| { /* Repack it. */ |
| unsigned int n = get_inner_bit_count (); |
| unsigned int outer = u >> n; |
| unsigned int inner = u & ((1 << n) - 1); |
| u = (outer<<16) | inner; |
| } |
| |
| return u; |
| } |
| |
| unsigned get_map_count () const { return mapCount; } |
| unsigned get_width () const { return ((entryFormat >> 4) & 3) + 1; } |
| unsigned get_inner_bit_count () const { return (entryFormat & 0xF) + 1; } |
| |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| c->check_range (mapDataZ.arrayZ, |
| mapCount, |
| get_width ())); |
| } |
| |
| protected: |
| HBUINT8 format; /* Format identifier--format = 0 */ |
| HBUINT8 entryFormat; /* A packed field that describes the compressed |
| * representation of delta-set indices. */ |
| MapCountT mapCount; /* The number of mapping entries. */ |
| UnsizedArrayOf<HBUINT8> |
| mapDataZ; /* The delta-set index mapping data. */ |
| |
| public: |
| DEFINE_SIZE_ARRAY (2+MapCountT::static_size, mapDataZ); |
| }; |
| |
| struct DeltaSetIndexMap |
| { |
| template <typename T> |
| bool serialize (hb_serialize_context_t *c, const T &plan) |
| { |
| TRACE_SERIALIZE (this); |
| unsigned length = plan.get_output_map ().length; |
| u.format = length <= 0xFFFF ? 0 : 1; |
| switch (u.format) { |
| case 0: return_trace (u.format0.serialize (c, plan)); |
| case 1: return_trace (u.format1.serialize (c, plan)); |
| default:return_trace (false); |
| } |
| } |
| |
| uint32_t map (unsigned v) const |
| { |
| switch (u.format) { |
| case 0: return (u.format0.map (v)); |
| case 1: return (u.format1.map (v)); |
| default:return v; |
| } |
| } |
| |
| unsigned get_map_count () const |
| { |
| switch (u.format) { |
| case 0: return u.format0.get_map_count (); |
| case 1: return u.format1.get_map_count (); |
| default:return 0; |
| } |
| } |
| |
| unsigned get_width () const |
| { |
| switch (u.format) { |
| case 0: return u.format0.get_width (); |
| case 1: return u.format1.get_width (); |
| default:return 0; |
| } |
| } |
| |
| unsigned get_inner_bit_count () const |
| { |
| switch (u.format) { |
| case 0: return u.format0.get_inner_bit_count (); |
| case 1: return u.format1.get_inner_bit_count (); |
| default:return 0; |
| } |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| if (!u.format.sanitize (c)) return_trace (false); |
| switch (u.format) { |
| case 0: return_trace (u.format0.sanitize (c)); |
| case 1: return_trace (u.format1.sanitize (c)); |
| default:return_trace (true); |
| } |
| } |
| |
| DeltaSetIndexMap* copy (hb_serialize_context_t *c) const |
| { |
| TRACE_SERIALIZE (this); |
| switch (u.format) { |
| case 0: return_trace (reinterpret_cast<DeltaSetIndexMap *> (u.format0.copy (c))); |
| case 1: return_trace (reinterpret_cast<DeltaSetIndexMap *> (u.format1.copy (c))); |
| default:return_trace (nullptr); |
| } |
| } |
| |
| protected: |
| union { |
| HBUINT8 format; /* Format identifier */ |
| DeltaSetIndexMapFormat01<HBUINT16> format0; |
| DeltaSetIndexMapFormat01<HBUINT32> format1; |
| } u; |
| public: |
| DEFINE_SIZE_UNION (1, format); |
| }; |
| |
| |
| struct VarStoreInstancer |
| { |
| VarStoreInstancer (const VariationStore *varStore, |
| const DeltaSetIndexMap *varIdxMap, |
| hb_array_t<int> coords) : |
| varStore (varStore), varIdxMap (varIdxMap), coords (coords) {} |
| |
| operator bool () const { return varStore && bool (coords); } |
| |
| /* according to the spec, if colr table has varStore but does not have |
| * varIdxMap, then an implicit identity mapping is used */ |
| float operator() (uint32_t varIdx, unsigned short offset = 0) const |
| { return varStore->get_delta (varIdxMap ? varIdxMap->map (VarIdx::add (varIdx, offset)) : varIdx + offset, coords); } |
| |
| const VariationStore *varStore; |
| const DeltaSetIndexMap *varIdxMap; |
| hb_array_t<int> coords; |
| }; |
| |
| /* https://docs.microsoft.com/en-us/typography/opentype/spec/otvarcommonformats#tuplevariationheader */ |
| struct TupleVariationHeader |
| { |
| friend struct tuple_delta_t; |
| unsigned get_size (unsigned axis_count) const |
| { return min_size + get_all_tuples (axis_count).get_size (); } |
| |
| unsigned get_data_size () const { return varDataSize; } |
| |
| const TupleVariationHeader &get_next (unsigned axis_count) const |
| { return StructAtOffset<TupleVariationHeader> (this, get_size (axis_count)); } |
| |
| bool unpack_axis_tuples (unsigned axis_count, |
| const hb_array_t<const F2DOT14> shared_tuples, |
| const hb_map_t *axes_old_index_tag_map, |
| hb_hashmap_t<hb_tag_t, Triple>& axis_tuples /* OUT */) const |
| { |
| const F2DOT14 *peak_tuple = nullptr; |
| if (has_peak ()) |
| peak_tuple = get_peak_tuple (axis_count).arrayZ; |
| else |
| { |
| unsigned int index = get_index (); |
| if (unlikely ((index + 1) * axis_count > shared_tuples.length)) |
| return false; |
| peak_tuple = shared_tuples.sub_array (axis_count * index, axis_count).arrayZ; |
| } |
| |
| const F2DOT14 *start_tuple = nullptr; |
| const F2DOT14 *end_tuple = nullptr; |
| bool has_interm = has_intermediate (); |
| |
| if (has_interm) |
| { |
| start_tuple = get_start_tuple (axis_count).arrayZ; |
| end_tuple = get_end_tuple (axis_count).arrayZ; |
| } |
| |
| for (unsigned i = 0; i < axis_count; i++) |
| { |
| float peak = peak_tuple[i].to_float (); |
| if (peak == 0.f) continue; |
| |
| hb_tag_t *axis_tag; |
| if (!axes_old_index_tag_map->has (i, &axis_tag)) |
| return false; |
| |
| float start, end; |
| if (has_interm) |
| { |
| start = start_tuple[i].to_float (); |
| end = end_tuple[i].to_float (); |
| } |
| else |
| { |
| start = hb_min (peak, 0.f); |
| end = hb_max (peak, 0.f); |
| } |
| axis_tuples.set (*axis_tag, Triple (start, peak, end)); |
| } |
| |
| return true; |
| } |
| |
| float calculate_scalar (hb_array_t<int> coords, unsigned int coord_count, |
| const hb_array_t<const F2DOT14> shared_tuples, |
| const hb_vector_t<hb_pair_t<int,int>> *shared_tuple_active_idx = nullptr) const |
| { |
| const F2DOT14 *peak_tuple; |
| |
| unsigned start_idx = 0; |
| unsigned end_idx = coord_count; |
| unsigned step = 1; |
| |
| if (has_peak ()) |
| peak_tuple = get_peak_tuple (coord_count).arrayZ; |
| else |
| { |
| unsigned int index = get_index (); |
| if (unlikely ((index + 1) * coord_count > shared_tuples.length)) |
| return 0.f; |
| peak_tuple = shared_tuples.sub_array (coord_count * index, coord_count).arrayZ; |
| |
| if (shared_tuple_active_idx) |
| { |
| if (unlikely (index >= shared_tuple_active_idx->length)) |
| return 0.f; |
| auto _ = (*shared_tuple_active_idx).arrayZ[index]; |
| if (_.second != -1) |
| { |
| start_idx = _.first; |
| end_idx = _.second + 1; |
| step = _.second - _.first; |
| } |
| else if (_.first != -1) |
| { |
| start_idx = _.first; |
| end_idx = start_idx + 1; |
| } |
| } |
| } |
| |
| const F2DOT14 *start_tuple = nullptr; |
| const F2DOT14 *end_tuple = nullptr; |
| bool has_interm = has_intermediate (); |
| if (has_interm) |
| { |
| start_tuple = get_start_tuple (coord_count).arrayZ; |
| end_tuple = get_end_tuple (coord_count).arrayZ; |
| } |
| |
| float scalar = 1.f; |
| for (unsigned int i = start_idx; i < end_idx; i += step) |
| { |
| int peak = peak_tuple[i].to_int (); |
| if (!peak) continue; |
| |
| int v = coords[i]; |
| if (v == peak) continue; |
| |
| if (has_interm) |
| { |
| int start = start_tuple[i].to_int (); |
| int end = end_tuple[i].to_int (); |
| if (unlikely (start > peak || peak > end || |
| (start < 0 && end > 0 && peak))) continue; |
| if (v < start || v > end) return 0.f; |
| if (v < peak) |
| { if (peak != start) scalar *= (float) (v - start) / (peak - start); } |
| else |
| { if (peak != end) scalar *= (float) (end - v) / (end - peak); } |
| } |
| else if (!v || v < hb_min (0, peak) || v > hb_max (0, peak)) return 0.f; |
| else |
| scalar *= (float) v / peak; |
| } |
| return scalar; |
| } |
| |
| bool has_peak () const { return tupleIndex & TuppleIndex::EmbeddedPeakTuple; } |
| bool has_intermediate () const { return tupleIndex & TuppleIndex::IntermediateRegion; } |
| bool has_private_points () const { return tupleIndex & TuppleIndex::PrivatePointNumbers; } |
| unsigned get_index () const { return tupleIndex & TuppleIndex::TupleIndexMask; } |
| |
| protected: |
| struct TuppleIndex : HBUINT16 |
| { |
| enum Flags { |
| EmbeddedPeakTuple = 0x8000u, |
| IntermediateRegion = 0x4000u, |
| PrivatePointNumbers = 0x2000u, |
| TupleIndexMask = 0x0FFFu |
| }; |
| |
| TuppleIndex& operator = (uint16_t i) { HBUINT16::operator= (i); return *this; } |
| DEFINE_SIZE_STATIC (2); |
| }; |
| |
| hb_array_t<const F2DOT14> get_all_tuples (unsigned axis_count) const |
| { return StructAfter<UnsizedArrayOf<F2DOT14>> (tupleIndex).as_array ((has_peak () + has_intermediate () * 2) * axis_count); } |
| hb_array_t<const F2DOT14> get_peak_tuple (unsigned axis_count) const |
| { return get_all_tuples (axis_count).sub_array (0, axis_count); } |
| hb_array_t<const F2DOT14> get_start_tuple (unsigned axis_count) const |
| { return get_all_tuples (axis_count).sub_array (has_peak () * axis_count, axis_count); } |
| hb_array_t<const F2DOT14> get_end_tuple (unsigned axis_count) const |
| { return get_all_tuples (axis_count).sub_array (has_peak () * axis_count + axis_count, axis_count); } |
| |
| HBUINT16 varDataSize; /* The size in bytes of the serialized |
| * data for this tuple variation table. */ |
| TuppleIndex tupleIndex; /* A packed field. The high 4 bits are flags (see below). |
| The low 12 bits are an index into a shared tuple |
| records array. */ |
| /* UnsizedArrayOf<F2DOT14> peakTuple - optional */ |
| /* Peak tuple record for this tuple variation table — optional, |
| * determined by flags in the tupleIndex value. |
| * |
| * Note that this must always be included in the 'cvar' table. */ |
| /* UnsizedArrayOf<F2DOT14> intermediateStartTuple - optional */ |
| /* Intermediate start tuple record for this tuple variation table — optional, |
| determined by flags in the tupleIndex value. */ |
| /* UnsizedArrayOf<F2DOT14> intermediateEndTuple - optional */ |
| /* Intermediate end tuple record for this tuple variation table — optional, |
| * determined by flags in the tupleIndex value. */ |
| public: |
| DEFINE_SIZE_MIN (4); |
| }; |
| |
| enum packed_delta_flag_t |
| { |
| DELTAS_ARE_ZERO = 0x80, |
| DELTAS_ARE_WORDS = 0x40, |
| DELTA_RUN_COUNT_MASK = 0x3F |
| }; |
| |
| struct tuple_delta_t |
| { |
| public: |
| hb_hashmap_t<hb_tag_t, Triple> axis_tuples; |
| |
| /* indices_length = point_count, indice[i] = 1 means point i is referenced */ |
| hb_vector_t<bool> indices; |
| |
| hb_vector_t<float> deltas_x; |
| /* empty for cvar tuples */ |
| hb_vector_t<float> deltas_y; |
| |
| /* compiled data: header and deltas |
| * compiled point data is saved in a hashmap within tuple_variations_t cause |
| * some point sets might be reused by different tuple variations */ |
| hb_vector_t<char> compiled_tuple_header; |
| hb_vector_t<char> compiled_deltas; |
| |
| tuple_delta_t () = default; |
| tuple_delta_t (const tuple_delta_t& o) = default; |
| |
| tuple_delta_t (tuple_delta_t&& o) : tuple_delta_t () |
| { |
| axis_tuples = std::move (o.axis_tuples); |
| indices = std::move (o.indices); |
| deltas_x = std::move (o.deltas_x); |
| deltas_y = std::move (o.deltas_y); |
| } |
| |
| tuple_delta_t& operator = (tuple_delta_t&& o) |
| { |
| hb_swap (*this, o); |
| return *this; |
| } |
| |
| void remove_axis (hb_tag_t axis_tag) |
| { axis_tuples.del (axis_tag); } |
| |
| bool set_tent (hb_tag_t axis_tag, Triple tent) |
| { return axis_tuples.set (axis_tag, tent); } |
| |
| tuple_delta_t& operator += (const tuple_delta_t& o) |
| { |
| unsigned num = indices.length; |
| for (unsigned i = 0; i < num; i++) |
| { |
| if (indices.arrayZ[i]) |
| { |
| if (o.indices.arrayZ[i]) |
| { |
| deltas_x[i] += o.deltas_x[i]; |
| if (deltas_y && o.deltas_y) |
| deltas_y[i] += o.deltas_y[i]; |
| } |
| } |
| else |
| { |
| if (!o.indices.arrayZ[i]) continue; |
| indices.arrayZ[i] = true; |
| deltas_x[i] = o.deltas_x[i]; |
| if (deltas_y && o.deltas_y) |
| deltas_y[i] = o.deltas_y[i]; |
| } |
| } |
| return *this; |
| } |
| |
| tuple_delta_t& operator *= (float scalar) |
| { |
| if (scalar == 1.0f) |
| return *this; |
| |
| unsigned num = indices.length; |
| for (unsigned i = 0; i < num; i++) |
| { |
| if (!indices.arrayZ[i]) continue; |
| |
| deltas_x[i] *= scalar; |
| if (deltas_y) |
| deltas_y[i] *= scalar; |
| } |
| return *this; |
| } |
| |
| hb_vector_t<tuple_delta_t> change_tuple_var_axis_limit (hb_tag_t axis_tag, Triple axis_limit, |
| TripleDistances axis_triple_distances) const |
| { |
| hb_vector_t<tuple_delta_t> out; |
| Triple *tent; |
| if (!axis_tuples.has (axis_tag, &tent)) |
| { |
| out.push (*this); |
| return out; |
| } |
| |
| if ((tent->minimum < 0.f && tent->maximum > 0.f) || |
| !(tent->minimum <= tent->middle && tent->middle <= tent->maximum)) |
| return out; |
| |
| if (tent->middle == 0.f) |
| { |
| out.push (*this); |
| return out; |
| } |
| |
| result_t solutions = rebase_tent (*tent, axis_limit, axis_triple_distances); |
| for (auto t : solutions) |
| { |
| tuple_delta_t new_var = *this; |
| if (t.second == Triple ()) |
| new_var.remove_axis (axis_tag); |
| else |
| new_var.set_tent (axis_tag, t.second); |
| |
| new_var *= t.first; |
| out.push (std::move (new_var)); |
| } |
| |
| return out; |
| } |
| |
| /* deltas should be compiled already before we compile tuple |
| * variation header cause we need to fill in the size of the |
| * serialized data for this tuple variation */ |
| //TODO(qxliu):add option to use sharedTuples in gvar |
| bool compile_tuple_var_header (const hb_map_t& axes_index_map, |
| unsigned points_data_length, |
| const hb_map_t& axes_old_index_tag_map) |
| { |
| if (!compiled_deltas) return false; |
| |
| unsigned cur_axis_count = axes_index_map.get_population (); |
| /* allocate enough memory: 1 peak + 2 intermediate coords + fixed header size */ |
| unsigned alloc_len = 3 * cur_axis_count * (F2DOT14::static_size) + 4; |
| if (unlikely (!compiled_tuple_header.resize (alloc_len))) return false; |
| |
| unsigned flag = 0; |
| /* skip the first 4 header bytes: variationDataSize+tupleIndex */ |
| F2DOT14* p = reinterpret_cast<F2DOT14 *> (compiled_tuple_header.begin () + 4); |
| F2DOT14* end = reinterpret_cast<F2DOT14 *> (compiled_tuple_header.end ()); |
| hb_array_t<F2DOT14> coords (p, end - p); |
| |
| /* encode peak coords */ |
| unsigned peak_count = encode_peak_coords(coords, flag, axes_index_map, axes_old_index_tag_map); |
| if (!peak_count) return false; |
| |
| /* encode interim coords, it's optional so returned num could be 0 */ |
| unsigned interim_count = encode_interm_coords (coords.sub_array (peak_count), flag, axes_index_map, axes_old_index_tag_map); |
| |
| //TODO(qxliu): add option to use shared_points in gvar |
| flag |= TupleVariationHeader::TuppleIndex::PrivatePointNumbers; |
| |
| unsigned serialized_data_size = points_data_length + compiled_deltas.length; |
| TupleVariationHeader *o = reinterpret_cast<TupleVariationHeader *> (compiled_tuple_header.begin ()); |
| o->varDataSize = serialized_data_size; |
| o->tupleIndex = flag; |
| |
| unsigned total_header_len = 4 + (peak_count + interim_count) * (F2DOT14::static_size); |
| return compiled_tuple_header.resize (total_header_len); |
| } |
| |
| unsigned encode_peak_coords (hb_array_t<F2DOT14> peak_coords, |
| unsigned& flag, |
| const hb_map_t& axes_index_map, |
| const hb_map_t& axes_old_index_tag_map) const |
| { |
| unsigned orig_axis_count = axes_old_index_tag_map.get_population (); |
| auto it = peak_coords.iter (); |
| unsigned count = 0; |
| for (unsigned i = 0; i < orig_axis_count; i++) |
| { |
| if (!axes_index_map.has (i)) /* axis pinned */ |
| continue; |
| hb_tag_t axis_tag = axes_old_index_tag_map.get (i); |
| Triple *coords; |
| if (!axis_tuples.has (axis_tag, &coords)) |
| (*it).set_int (0); |
| else |
| (*it).set_float (coords->middle); |
| it++; |
| count++; |
| } |
| flag |= TupleVariationHeader::TuppleIndex::EmbeddedPeakTuple; |
| return count; |
| } |
| |
| /* if no need to encode intermediate coords, then just return p */ |
| unsigned encode_interm_coords (hb_array_t<F2DOT14> coords, |
| unsigned& flag, |
| const hb_map_t& axes_index_map, |
| const hb_map_t& axes_old_index_tag_map) const |
| { |
| unsigned orig_axis_count = axes_old_index_tag_map.get_population (); |
| unsigned cur_axis_count = axes_index_map.get_population (); |
| |
| auto start_coords_iter = coords.sub_array (0, cur_axis_count).iter (); |
| auto end_coords_iter = coords.sub_array (cur_axis_count).iter (); |
| bool encode_needed = false; |
| unsigned count = 0; |
| for (unsigned i = 0; i < orig_axis_count; i++) |
| { |
| if (!axes_index_map.has (i)) /* axis pinned */ |
| continue; |
| hb_tag_t axis_tag = axes_old_index_tag_map.get (i); |
| Triple *coords; |
| float min_val = 0.f, val = 0.f, max_val = 0.f; |
| if (axis_tuples.has (axis_tag, &coords)) |
| { |
| min_val = coords->minimum; |
| val = coords->middle; |
| max_val = coords->maximum; |
| } |
| |
| (*start_coords_iter).set_float (min_val); |
| (*end_coords_iter).set_float (max_val); |
| |
| start_coords_iter++; |
| end_coords_iter++; |
| count += 2; |
| if (min_val != hb_min (val, 0.f) || max_val != hb_max (val, 0.f)) |
| encode_needed = true; |
| } |
| |
| if (encode_needed) |
| { |
| flag |= TupleVariationHeader::TuppleIndex::IntermediateRegion; |
| return count; |
| } |
| return 0; |
| } |
| |
| bool compile_deltas () |
| { |
| hb_vector_t<int> rounded_deltas; |
| if (unlikely (!rounded_deltas.alloc (indices.length))) |
| return false; |
| |
| for (unsigned i = 0; i < indices.length; i++) |
| { |
| if (!indices[i]) continue; |
| int rounded_delta = (int) roundf (deltas_x[i]); |
| rounded_deltas.push (rounded_delta); |
| } |
| |
| if (!rounded_deltas) return false; |
| /* allocate enough memories 3 * num_deltas */ |
| unsigned alloc_len = 3 * rounded_deltas.length; |
| if (deltas_y) |
| alloc_len *= 2; |
| |
| if (unlikely (!compiled_deltas.resize (alloc_len))) return false; |
| |
| unsigned i = 0; |
| unsigned encoded_len = encode_delta_run (i, compiled_deltas.as_array (), rounded_deltas); |
| |
| if (deltas_y) |
| { |
| /* reuse the rounded_deltas vector, check that deltas_y have the same num of deltas as deltas_x */ |
| unsigned j = 0; |
| for (unsigned idx = 0; idx < indices.length; idx++) |
| { |
| if (!indices[idx]) continue; |
| int rounded_delta = (int) roundf (deltas_y[idx]); |
| |
| if (j >= rounded_deltas.length) return false; |
| |
| rounded_deltas[j++] = rounded_delta; |
| } |
| |
| if (j != rounded_deltas.length) return false; |
| /* reset i because we reuse rounded_deltas for deltas_y */ |
| i = 0; |
| encoded_len += encode_delta_run (i, compiled_deltas.as_array ().sub_array (encoded_len), rounded_deltas); |
| } |
| return compiled_deltas.resize (encoded_len); |
| } |
| |
| unsigned encode_delta_run (unsigned& i, |
| hb_array_t<char> encoded_bytes, |
| const hb_vector_t<int>& deltas) const |
| { |
| unsigned num_deltas = deltas.length; |
| unsigned encoded_len = 0; |
| while (i < num_deltas) |
| { |
| int val = deltas[i]; |
| if (val == 0) |
| encoded_len += encode_delta_run_as_zeroes (i, encoded_bytes.sub_array (encoded_len), deltas); |
| else if (val >= -128 && val <= 127) |
| encoded_len += encode_delta_run_as_bytes (i, encoded_bytes.sub_array (encoded_len), deltas); |
| else |
| encoded_len += encode_delta_run_as_words (i, encoded_bytes.sub_array (encoded_len), deltas); |
| } |
| return encoded_len; |
| } |
| |
| unsigned encode_delta_run_as_zeroes (unsigned& i, |
| hb_array_t<char> encoded_bytes, |
| const hb_vector_t<int>& deltas) const |
| { |
| unsigned num_deltas = deltas.length; |
| unsigned run_length = 0; |
| auto it = encoded_bytes.iter (); |
| unsigned encoded_len = 0; |
| while (i < num_deltas && deltas[i] == 0) |
| { |
| i++; |
| run_length++; |
| } |
| |
| while (run_length >= 64) |
| { |
| *it++ = char (DELTAS_ARE_ZERO | 63); |
| run_length -= 64; |
| encoded_len++; |
| } |
| |
| if (run_length) |
| { |
| *it++ = char (DELTAS_ARE_ZERO | (run_length - 1)); |
| encoded_len++; |
| } |
| return encoded_len; |
| } |
| |
| unsigned encode_delta_run_as_bytes (unsigned &i, |
| hb_array_t<char> encoded_bytes, |
| const hb_vector_t<int>& deltas) const |
| { |
| unsigned start = i; |
| unsigned num_deltas = deltas.length; |
| while (i < num_deltas) |
| { |
| int val = deltas[i]; |
| if (val > 127 || val < -128) |
| break; |
| |
| /* from fonttools: if there're 2 or more zeros in a sequence, |
| * it is better to start a new run to save bytes. */ |
| if (val == 0 && i + 1 < num_deltas && deltas[i+1] == 0) |
| break; |
| |
| i++; |
| } |
| unsigned run_length = i - start; |
| |
| unsigned encoded_len = 0; |
| auto it = encoded_bytes.iter (); |
| |
| while (run_length >= 64) |
| { |
| *it++ = 63; |
| encoded_len++; |
| |
| for (unsigned j = 0; j < 64; j++) |
| { |
| *it++ = static_cast<char> (deltas[start + j]); |
| encoded_len++; |
| } |
| |
| start += 64; |
| run_length -= 64; |
| } |
| |
| if (run_length) |
| { |
| *it++ = run_length - 1; |
| encoded_len++; |
| |
| while (start < i) |
| { |
| *it++ = static_cast<char> (deltas[start++]); |
| encoded_len++; |
| } |
| } |
| |
| return encoded_len; |
| } |
| |
| unsigned encode_delta_run_as_words (unsigned &i, |
| hb_array_t<char> encoded_bytes, |
| const hb_vector_t<int>& deltas) const |
| { |
| unsigned start = i; |
| unsigned num_deltas = deltas.length; |
| while (i < num_deltas) |
| { |
| int val = deltas[i]; |
| |
| /* start a new run for a single zero value*/ |
| if (val == 0) break; |
| |
| /* from fonttools: continue word-encoded run if there's only one |
| * single value in the range [-128, 127] because it is more compact. |
| * Only start a new run when there're 2 continuous such values. */ |
| if (val >= -128 && val <= 127 && |
| i + 1 < num_deltas && |
| deltas[i+1] >= -128 && deltas[i+1] <= 127) |
| break; |
| |
| i++; |
| } |
| |
| unsigned run_length = i - start; |
| auto it = encoded_bytes.iter (); |
| unsigned encoded_len = 0; |
| while (run_length >= 64) |
| { |
| *it++ = (DELTAS_ARE_WORDS | 63); |
| encoded_len++; |
| |
| for (unsigned j = 0; j < 64; j++) |
| { |
| int16_t delta_val = deltas[start + j]; |
| *it++ = static_cast<char> (delta_val >> 8); |
| *it++ = static_cast<char> (delta_val & 0xFF); |
| |
| encoded_len += 2; |
| } |
| |
| start += 64; |
| run_length -= 64; |
| } |
| |
| if (run_length) |
| { |
| *it++ = (DELTAS_ARE_WORDS | (run_length - 1)); |
| encoded_len++; |
| while (start < i) |
| { |
| int16_t delta_val = deltas[start++]; |
| *it++ = static_cast<char> (delta_val >> 8); |
| *it++ = static_cast<char> (delta_val & 0xFF); |
| |
| encoded_len += 2; |
| } |
| } |
| return encoded_len; |
| } |
| }; |
| |
| struct TupleVariationData |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| // here check on min_size only, TupleVariationHeader and var data will be |
| // checked while accessing through iterator. |
| return_trace (c->check_struct (this)); |
| } |
| |
| unsigned get_size (unsigned axis_count) const |
| { |
| unsigned total_size = min_size; |
| unsigned count = tupleVarCount.get_count (); |
| const TupleVariationHeader *tuple_var_header = &(get_tuple_var_header()); |
| for (unsigned i = 0; i < count; i++) |
| { |
| total_size += tuple_var_header->get_size (axis_count) + tuple_var_header->get_data_size (); |
| tuple_var_header = &tuple_var_header->get_next (axis_count); |
| } |
| |
| return total_size; |
| } |
| |
| const TupleVariationHeader &get_tuple_var_header (void) const |
| { return StructAfter<TupleVariationHeader> (data); } |
| |
| struct tuple_iterator_t; |
| struct tuple_variations_t |
| { |
| hb_vector_t<tuple_delta_t> tuple_vars; |
| |
| private: |
| /* referenced point set->compiled point data map */ |
| hb_hashmap_t<const hb_vector_t<bool>*, hb_bytes_t> point_data_map; |
| /* referenced point set-> count map, used in finding shared points */ |
| hb_hashmap_t<const hb_vector_t<bool>*, unsigned> point_set_count_map; |
| |
| public: |
| ~tuple_variations_t () { fini (); } |
| void fini () |
| { |
| for (auto _ : point_data_map.values ()) |
| _.fini (); |
| |
| point_set_count_map.fini (); |
| tuple_vars.fini (); |
| } |
| |
| unsigned get_var_count () const |
| { return tuple_vars.length; } |
| |
| bool create_from_tuple_var_data (tuple_iterator_t iterator, |
| unsigned tuple_var_count, |
| unsigned point_count, |
| bool is_gvar, |
| const hb_map_t *axes_old_index_tag_map, |
| const hb_vector_t<unsigned> &shared_indices, |
| const hb_array_t<const F2DOT14> shared_tuples) |
| { |
| do |
| { |
| const HBUINT8 *p = iterator.get_serialized_data (); |
| unsigned int length = iterator.current_tuple->get_data_size (); |
| if (unlikely (!iterator.var_data_bytes.check_range (p, length))) |
| { fini (); return false; } |
| |
| hb_hashmap_t<hb_tag_t, Triple> axis_tuples; |
| if (!iterator.current_tuple->unpack_axis_tuples (iterator.get_axis_count (), shared_tuples, axes_old_index_tag_map, axis_tuples) |
| || axis_tuples.is_empty ()) |
| { fini (); return false; } |
| |
| hb_vector_t<unsigned> private_indices; |
| bool has_private_points = iterator.current_tuple->has_private_points (); |
| const HBUINT8 *end = p + length; |
| if (has_private_points && |
| !TupleVariationData::unpack_points (p, private_indices, end)) |
| { fini (); return false; } |
| |
| const hb_vector_t<unsigned> &indices = has_private_points ? private_indices : shared_indices; |
| bool apply_to_all = (indices.length == 0); |
| unsigned num_deltas = apply_to_all ? point_count : indices.length; |
| |
| hb_vector_t<int> deltas_x; |
| |
| if (unlikely (!deltas_x.resize (num_deltas, false) || |
| !TupleVariationData::unpack_deltas (p, deltas_x, end))) |
| { fini (); return false; } |
| |
| hb_vector_t<int> deltas_y; |
| if (is_gvar) |
| { |
| if (unlikely (!deltas_y.resize (num_deltas, false) || |
| !TupleVariationData::unpack_deltas (p, deltas_y, end))) |
| { fini (); return false; } |
| } |
| |
| tuple_delta_t var; |
| var.axis_tuples = std::move (axis_tuples); |
| if (unlikely (!var.indices.resize (point_count) || |
| !var.deltas_x.resize (point_count, false))) |
| { fini (); return false; } |
| |
| if (is_gvar && unlikely (!var.deltas_y.resize (point_count, false))) |
| { fini (); return false; } |
| |
| for (unsigned i = 0; i < num_deltas; i++) |
| { |
| unsigned idx = apply_to_all ? i : indices[i]; |
| if (idx >= point_count) continue; |
| var.indices[idx] = true; |
| var.deltas_x[idx] = static_cast<float> (deltas_x[i]); |
| if (is_gvar) |
| var.deltas_y[idx] = static_cast<float> (deltas_y[i]); |
| } |
| tuple_vars.push (std::move (var)); |
| } while (iterator.move_to_next ()); |
| return true; |
| } |
| |
| void change_tuple_variations_axis_limits (const hb_hashmap_t<hb_tag_t, Triple>& normalized_axes_location, |
| const hb_hashmap_t<hb_tag_t, TripleDistances>& axes_triple_distances) |
| { |
| for (auto _ : normalized_axes_location) |
| { |
| hb_tag_t axis_tag = _.first; |
| Triple axis_limit = _.second; |
| TripleDistances axis_triple_distances{1.f, 1.f}; |
| if (axes_triple_distances.has (axis_tag)) |
| axis_triple_distances = axes_triple_distances.get (axis_tag); |
| |
| hb_vector_t<tuple_delta_t> new_vars; |
| for (const tuple_delta_t& var : tuple_vars) |
| { |
| hb_vector_t<tuple_delta_t> out = var.change_tuple_var_axis_limit (axis_tag, axis_limit, axis_triple_distances); |
| if (!out) continue; |
| unsigned new_len = new_vars.length + out.length; |
| |
| if (unlikely (!new_vars.alloc (new_len, false))) |
| { fini (); return;} |
| |
| for (unsigned i = 0; i < out.length; i++) |
| new_vars.push (std::move (out[i])); |
| } |
| tuple_vars.fini (); |
| tuple_vars = std::move (new_vars); |
| } |
| } |
| |
| /* merge tuple variations with overlapping tents */ |
| void merge_tuple_variations () |
| { |
| hb_vector_t<tuple_delta_t> new_vars; |
| hb_hashmap_t<hb_hashmap_t<hb_tag_t, Triple>, unsigned> m; |
| unsigned i = 0; |
| for (const tuple_delta_t& var : tuple_vars) |
| { |
| /* if all axes are pinned, drop the tuple variation */ |
| if (var.axis_tuples.is_empty ()) continue; |
| |
| unsigned *idx; |
| if (m.has (var.axis_tuples, &idx)) |
| { |
| new_vars[*idx] += var; |
| } |
| else |
| { |
| new_vars.push (var); |
| m.set (var.axis_tuples, i); |
| i++; |
| } |
| } |
| tuple_vars.fini (); |
| tuple_vars = std::move (new_vars); |
| } |
| |
| hb_bytes_t compile_point_set (const hb_vector_t<bool> &point_indices) |
| { |
| unsigned num_points = 0; |
| for (bool i : point_indices) |
| if (i) num_points++; |
| |
| unsigned indices_length = point_indices.length; |
| /* If the points set consists of all points in the glyph, it's encoded with a |
| * single zero byte */ |
| if (num_points == indices_length) |
| { |
| char *p = (char *) hb_calloc (1, sizeof (char)); |
| if (unlikely (!p)) return hb_bytes_t (); |
| |
| return hb_bytes_t (p, 1); |
| } |
| |
| /* allocate enough memories: 2 bytes for count + 3 bytes for each point */ |
| unsigned num_bytes = 2 + 3 *num_points; |
| char *p = (char *) hb_calloc (num_bytes, sizeof (char)); |
| if (unlikely (!p)) return hb_bytes_t (); |
| |
| unsigned pos = 0; |
| /* binary data starts with the total number of reference points */ |
| if (num_points < 0x80) |
| p[pos++] = num_points; |
| else |
| { |
| p[pos++] = ((num_points >> 8) | 0x80); |
| p[pos++] = num_points & 0xFF; |
| } |
| |
| const unsigned max_run_length = 0x7F; |
| unsigned i = 0; |
| unsigned last_value = 0; |
| unsigned num_encoded = 0; |
| while (i < indices_length && num_encoded < num_points) |
| { |
| unsigned run_length = 0; |
| unsigned header_pos = pos; |
| p[pos++] = 0; |
| |
| bool use_byte_encoding = false; |
| bool new_run = true; |
| while (i < indices_length && num_encoded < num_points && |
| run_length <= max_run_length) |
| { |
| // find out next referenced point index |
| while (i < indices_length && !point_indices[i]) |
| i++; |
| |
| if (i >= indices_length) break; |
| |
| unsigned cur_value = i; |
| unsigned delta = cur_value - last_value; |
| |
| if (new_run) |
| { |
| use_byte_encoding = (delta <= 0xFF); |
| new_run = false; |
| } |
| |
| if (use_byte_encoding && delta > 0xFF) |
| break; |
| |
| if (use_byte_encoding) |
| p[pos++] = delta; |
| else |
| { |
| p[pos++] = delta >> 8; |
| p[pos++] = delta & 0xFF; |
| } |
| i++; |
| last_value = cur_value; |
| run_length++; |
| num_encoded++; |
| } |
| |
| if (use_byte_encoding) |
| p[header_pos] = run_length - 1; |
| else |
| p[header_pos] = (run_length - 1) | 0x80; |
| } |
| return hb_bytes_t (p, pos); |
| } |
| |
| /* compile all point set and store byte data in a point_set->hb_bytes_t hashmap, |
| * also update point_set->count map, which will be used in finding shared |
| * point set*/ |
| bool compile_all_point_sets () |
| { |
| for (const auto& tuple: tuple_vars) |
| { |
| const hb_vector_t<bool>* points_set = &(tuple.indices); |
| if (point_data_map.has (points_set)) |
| { |
| unsigned *count; |
| if (unlikely (!point_set_count_map.has (points_set, &count) || |
| !point_set_count_map.set (points_set, (*count) + 1))) |
| return false; |
| continue; |
| } |
| |
| hb_bytes_t compiled_data = compile_point_set (*points_set); |
| if (unlikely (compiled_data == hb_bytes_t ())) |
| return false; |
| |
| if (!point_data_map.set (points_set, compiled_data) || |
| !point_set_count_map.set (points_set, 1)) |
| return false; |
| } |
| return true; |
| } |
| |
| /* find shared points set which saves most bytes */ |
| hb_bytes_t find_shared_points () |
| { |
| unsigned max_saved_bytes = 0; |
| hb_bytes_t res{}; |
| |
| for (const auto& _ : point_data_map.iter ()) |
| { |
| const hb_vector_t<bool>* points_set = _.first; |
| unsigned data_length = _.second.length; |
| unsigned *count; |
| if (unlikely (!point_set_count_map.has (points_set, &count) || |
| *count <= 1)) |
| return hb_bytes_t (); |
| |
| unsigned saved_bytes = data_length * ((*count) -1); |
| if (saved_bytes > max_saved_bytes) |
| { |
| max_saved_bytes = saved_bytes; |
| res = _.second; |
| } |
| } |
| return res; |
| } |
| |
| void instantiate (const hb_hashmap_t<hb_tag_t, Triple>& normalized_axes_location, |
| const hb_hashmap_t<hb_tag_t, TripleDistances>& axes_triple_distances) |
| { |
| change_tuple_variations_axis_limits (normalized_axes_location, axes_triple_distances); |
| merge_tuple_variations (); |
| } |
| |
| bool compile_bytes (const hb_map_t& axes_index_map, |
| const hb_map_t& axes_old_index_tag_map) |
| { |
| // compile points set and store data in hashmap |
| if (!compile_all_point_sets ()) |
| return false; |
| // compile delta and tuple var header for each tuple variation |
| for (auto& tuple: tuple_vars) |
| { |
| const hb_vector_t<bool>* points_set = &(tuple.indices); |
| hb_bytes_t *points_data; |
| if (unlikely (!point_data_map.has (points_set, &points_data))) |
| return false; |
| |
| if (!tuple.compile_deltas ()) |
| return false; |
| |
| if (!tuple.compile_tuple_var_header (axes_index_map, points_data->length, axes_old_index_tag_map)) |
| return false; |
| } |
| return true; |
| } |
| |
| bool serialize_var_headers (hb_serialize_context_t *c, unsigned& total_header_len) const |
| { |
| TRACE_SERIALIZE (this); |
| for (const auto& tuple: tuple_vars) |
| { |
| tuple.compiled_tuple_header.as_array ().copy (c); |
| if (c->in_error ()) return_trace (false); |
| total_header_len += tuple.compiled_tuple_header.length; |
| } |
| return_trace (true); |
| } |
| |
| bool serialize_var_data (hb_serialize_context_t *c) const |
| { |
| TRACE_SERIALIZE (this); |
| for (const auto& tuple: tuple_vars) |
| { |
| const hb_vector_t<bool>* points_set = &(tuple.indices); |
| hb_bytes_t *point_data; |
| if (!point_data_map.has (points_set, &point_data)) |
| return_trace (false); |
| |
| point_data->copy (c); |
| tuple.compiled_deltas.as_array ().copy (c); |
| if (c->in_error ()) return_trace (false); |
| } |
| return_trace (true); |
| } |
| }; |
| |
| struct tuple_iterator_t |
| { |
| unsigned get_axis_count () const { return axis_count; } |
| |
| void init (hb_bytes_t var_data_bytes_, unsigned int axis_count_, const void *table_base_) |
| { |
| var_data_bytes = var_data_bytes_; |
| var_data = var_data_bytes_.as<TupleVariationData> (); |
| index = 0; |
| axis_count = axis_count_; |
| current_tuple = &var_data->get_tuple_var_header (); |
| data_offset = 0; |
| table_base = table_base_; |
| } |
| |
| bool get_shared_indices (hb_vector_t<unsigned int> &shared_indices /* OUT */) |
| { |
| if (var_data->has_shared_point_numbers ()) |
| { |
| const HBUINT8 *base = &(table_base+var_data->data); |
| const HBUINT8 *p = base; |
| if (!unpack_points (p, shared_indices, (const HBUINT8 *) (var_data_bytes.arrayZ + var_data_bytes.length))) return false; |
| data_offset = p - base; |
| } |
| return true; |
| } |
| |
| bool is_valid () const |
| { |
| return (index < var_data->tupleVarCount.get_count ()) && |
| var_data_bytes.check_range (current_tuple, TupleVariationHeader::min_size) && |
| var_data_bytes.check_range (current_tuple, hb_max (current_tuple->get_data_size (), |
| current_tuple->get_size (axis_count))); |
| } |
| |
| bool move_to_next () |
| { |
| data_offset += current_tuple->get_data_size (); |
| current_tuple = ¤t_tuple->get_next (axis_count); |
| index++; |
| return is_valid (); |
| } |
| |
| const HBUINT8 *get_serialized_data () const |
| { return &(table_base+var_data->data) + data_offset; } |
| |
| private: |
| const TupleVariationData *var_data; |
| unsigned int index; |
| unsigned int axis_count; |
| unsigned int data_offset; |
| const void *table_base; |
| |
| public: |
| hb_bytes_t var_data_bytes; |
| const TupleVariationHeader *current_tuple; |
| }; |
| |
| static bool get_tuple_iterator (hb_bytes_t var_data_bytes, unsigned axis_count, |
| const void *table_base, |
| hb_vector_t<unsigned int> &shared_indices /* OUT */, |
| tuple_iterator_t *iterator /* OUT */) |
| { |
| iterator->init (var_data_bytes, axis_count, table_base); |
| if (!iterator->get_shared_indices (shared_indices)) |
| return false; |
| return iterator->is_valid (); |
| } |
| |
| bool has_shared_point_numbers () const { return tupleVarCount.has_shared_point_numbers (); } |
| |
| static bool unpack_points (const HBUINT8 *&p /* IN/OUT */, |
| hb_vector_t<unsigned int> &points /* OUT */, |
| const HBUINT8 *end) |
| { |
| enum packed_point_flag_t |
| { |
| POINTS_ARE_WORDS = 0x80, |
| POINT_RUN_COUNT_MASK = 0x7F |
| }; |
| |
| if (unlikely (p + 1 > end)) return false; |
| |
| unsigned count = *p++; |
| if (count & POINTS_ARE_WORDS) |
| { |
| if (unlikely (p + 1 > end)) return false; |
| count = ((count & POINT_RUN_COUNT_MASK) << 8) | *p++; |
| } |
| if (unlikely (!points.resize (count, false))) return false; |
| |
| unsigned n = 0; |
| unsigned i = 0; |
| while (i < count) |
| { |
| if (unlikely (p + 1 > end)) return false; |
| unsigned control = *p++; |
| unsigned run_count = (control & POINT_RUN_COUNT_MASK) + 1; |
| unsigned stop = i + run_count; |
| if (unlikely (stop > count)) return false; |
| if (control & POINTS_ARE_WORDS) |
| { |
| if (unlikely (p + run_count * HBUINT16::static_size > end)) return false; |
| for (; i < stop; i++) |
| { |
| n += *(const HBUINT16 *)p; |
| points.arrayZ[i] = n; |
| p += HBUINT16::static_size; |
| } |
| } |
| else |
| { |
| if (unlikely (p + run_count > end)) return false; |
| for (; i < stop; i++) |
| { |
| n += *p++; |
| points.arrayZ[i] = n; |
| } |
| } |
| } |
| return true; |
| } |
| |
| static bool unpack_deltas (const HBUINT8 *&p /* IN/OUT */, |
| hb_vector_t<int> &deltas /* IN/OUT */, |
| const HBUINT8 *end) |
| { |
| unsigned i = 0; |
| unsigned count = deltas.length; |
| while (i < count) |
| { |
| if (unlikely (p + 1 > end)) return false; |
| unsigned control = *p++; |
| unsigned run_count = (control & DELTA_RUN_COUNT_MASK) + 1; |
| unsigned stop = i + run_count; |
| if (unlikely (stop > count)) return false; |
| if (control & DELTAS_ARE_ZERO) |
| { |
| for (; i < stop; i++) |
| deltas.arrayZ[i] = 0; |
| } |
| else if (control & DELTAS_ARE_WORDS) |
| { |
| if (unlikely (p + run_count * HBUINT16::static_size > end)) return false; |
| for (; i < stop; i++) |
| { |
| deltas.arrayZ[i] = * (const HBINT16 *) p; |
| p += HBUINT16::static_size; |
| } |
| } |
| else |
| { |
| if (unlikely (p + run_count > end)) return false; |
| for (; i < stop; i++) |
| { |
| deltas.arrayZ[i] = * (const HBINT8 *) p++; |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool has_data () const { return tupleVarCount; } |
| |
| bool decompile_tuple_variations (unsigned point_count, |
| bool is_gvar, |
| tuple_iterator_t iterator, |
| const hb_map_t *axes_old_index_tag_map, |
| const hb_vector_t<unsigned> &shared_indices, |
| const hb_array_t<const F2DOT14> shared_tuples, |
| tuple_variations_t& tuple_variations /* OUT */) const |
| { |
| return tuple_variations.create_from_tuple_var_data (iterator, tupleVarCount, |
| point_count, is_gvar, |
| axes_old_index_tag_map, |
| shared_indices, |
| shared_tuples); |
| } |
| |
| bool serialize (hb_serialize_context_t *c, |
| bool is_gvar, |
| tuple_variations_t& tuple_variations) const |
| { |
| TRACE_SERIALIZE (this); |
| auto *out = c->start_embed (this); |
| if (unlikely (!c->extend_min (out))) return_trace (false); |
| |
| if (!c->check_assign (out->tupleVarCount, tuple_variations.get_var_count (), |
| HB_SERIALIZE_ERROR_INT_OVERFLOW)) return_trace (false); |
| |
| unsigned total_header_len = 0; |
| |
| if (!tuple_variations.serialize_var_headers (c, total_header_len)) |
| return_trace (false); |
| |
| unsigned data_offset = min_size + total_header_len; |
| if (!is_gvar) data_offset += 4; |
| if (!c->check_assign (out->data, data_offset, HB_SERIALIZE_ERROR_INT_OVERFLOW)) return_trace (false); |
| |
| return tuple_variations.serialize_var_data (c); |
| } |
| |
| protected: |
| struct TupleVarCount : HBUINT16 |
| { |
| bool has_shared_point_numbers () const { return ((*this) & SharedPointNumbers); } |
| unsigned int get_count () const { return (*this) & CountMask; } |
| TupleVarCount& operator = (uint16_t i) { HBUINT16::operator= (i); return *this; } |
| |
| protected: |
| enum Flags |
| { |
| SharedPointNumbers= 0x8000u, |
| CountMask = 0x0FFFu |
| }; |
| public: |
| DEFINE_SIZE_STATIC (2); |
| }; |
| |
| TupleVarCount tupleVarCount; /* A packed field. The high 4 bits are flags, and the |
| * low 12 bits are the number of tuple variation tables |
| * for this glyph. The number of tuple variation tables |
| * can be any number between 1 and 4095. */ |
| Offset16To<HBUINT8> |
| data; /* Offset from the start of the base table |
| * to the serialized data. */ |
| /* TupleVariationHeader tupleVariationHeaders[] *//* Array of tuple variation headers. */ |
| public: |
| DEFINE_SIZE_MIN (4); |
| }; |
| |
| } /* namespace OT */ |
| |
| |
| #endif /* HB_OT_VAR_COMMON_HH */ |