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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-var-gvar-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-var-gvar-table.hh | 878 |
1 files changed, 878 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-var-gvar-table.hh b/gfx/harfbuzz/src/hb-ot-var-gvar-table.hh new file mode 100644 index 0000000000..1c7a1f6c1e --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-var-gvar-table.hh @@ -0,0 +1,878 @@ +/* + * Copyright © 2019 Adobe Inc. + * Copyright © 2019 Ebrahim Byagowi + * + * 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_OT_VAR_GVAR_TABLE_HH +#define HB_OT_VAR_GVAR_TABLE_HH + +#include "hb-open-type.hh" +#include "hb-ot-var-common.hh" + +/* + * gvar -- Glyph Variation Table + * https://docs.microsoft.com/en-us/typography/opentype/spec/gvar + */ +#define HB_OT_TAG_gvar HB_TAG('g','v','a','r') + +namespace OT { + +struct GlyphVariationData : TupleVariationData +{}; + +struct glyph_variations_t +{ + using tuple_variations_t = TupleVariationData::tuple_variations_t; + hb_vector_t<tuple_variations_t> glyph_variations; + + hb_vector_t<char> compiled_shared_tuples; + private: + unsigned shared_tuples_count = 0; + + /* shared coords-> index map after instantiation */ + hb_hashmap_t<const hb_vector_t<char>*, unsigned> shared_tuples_idx_map; + + public: + unsigned compiled_shared_tuples_count () const + { return shared_tuples_count; } + + unsigned compiled_byte_size () const + { + unsigned byte_size = 0; + for (const auto& _ : glyph_variations) + byte_size += _.get_compiled_byte_size (); + + return byte_size; + } + + bool create_from_glyphs_var_data (unsigned axis_count, + const hb_array_t<const F2DOT14> shared_tuples, + const hb_subset_plan_t *plan, + const hb_hashmap_t<hb_codepoint_t, hb_bytes_t>& new_gid_var_data_map) + { + if (unlikely (!glyph_variations.alloc (plan->new_to_old_gid_list.length, true))) + return false; + + auto it = hb_iter (plan->new_to_old_gid_list); + for (auto &_ : it) + { + hb_codepoint_t new_gid = _.first; + contour_point_vector_t *all_contour_points; + if (!new_gid_var_data_map.has (new_gid) || + !plan->new_gid_contour_points_map.has (new_gid, &all_contour_points)) + return false; + hb_bytes_t var_data = new_gid_var_data_map.get (new_gid); + + const GlyphVariationData* p = reinterpret_cast<const GlyphVariationData*> (var_data.arrayZ); + hb_vector_t<unsigned> shared_indices; + GlyphVariationData::tuple_iterator_t iterator; + tuple_variations_t tuple_vars; + + /* in case variation data is empty, push an empty struct into the vector, + * keep the vector in sync with the new_to_old_gid_list */ + if (!var_data || ! p->has_data () || !all_contour_points->length || + !GlyphVariationData::get_tuple_iterator (var_data, axis_count, + var_data.arrayZ, + shared_indices, &iterator)) + { + glyph_variations.push (std::move (tuple_vars)); + continue; + } + + if (!p->decompile_tuple_variations (all_contour_points->length, true /* is_gvar */, + iterator, &(plan->axes_old_index_tag_map), + shared_indices, shared_tuples, + tuple_vars /* OUT */)) + return false; + glyph_variations.push (std::move (tuple_vars)); + } + return !glyph_variations.in_error () && glyph_variations.length == plan->new_to_old_gid_list.length; + } + + bool instantiate (const hb_subset_plan_t *plan) + { + unsigned count = plan->new_to_old_gid_list.length; + for (unsigned i = 0; i < count; i++) + { + hb_codepoint_t new_gid = plan->new_to_old_gid_list[i].first; + contour_point_vector_t *all_points; + if (!plan->new_gid_contour_points_map.has (new_gid, &all_points)) + return false; + if (!glyph_variations[i].instantiate (plan->axes_location, plan->axes_triple_distances, all_points)) + return false; + } + return true; + } + + bool compile_bytes (const hb_map_t& axes_index_map, + const hb_map_t& axes_old_index_tag_map) + { + if (!compile_shared_tuples (axes_index_map, axes_old_index_tag_map)) + return false; + for (tuple_variations_t& vars: glyph_variations) + if (!vars.compile_bytes (axes_index_map, axes_old_index_tag_map, + true, /* use shared points*/ + &shared_tuples_idx_map)) + return false; + + return true; + } + + bool compile_shared_tuples (const hb_map_t& axes_index_map, + const hb_map_t& axes_old_index_tag_map) + { + /* key is pointer to compiled_peak_coords inside each tuple, hashing + * function will always deref pointers first */ + hb_hashmap_t<const hb_vector_t<char>*, unsigned> coords_count_map; + + /* count the num of shared coords */ + for (tuple_variations_t& vars: glyph_variations) + { + for (tuple_delta_t& var : vars.tuple_vars) + { + if (!var.compile_peak_coords (axes_index_map, axes_old_index_tag_map)) + return false; + unsigned* count; + if (coords_count_map.has (&(var.compiled_peak_coords), &count)) + coords_count_map.set (&(var.compiled_peak_coords), *count + 1); + else + coords_count_map.set (&(var.compiled_peak_coords), 1); + } + } + + if (!coords_count_map || coords_count_map.in_error ()) + return false; + + /* add only those coords that are used more than once into the vector and sort */ + hb_vector_t<const hb_vector_t<char>*> shared_coords; + if (unlikely (!shared_coords.alloc (coords_count_map.get_population ()))) + return false; + + for (const auto _ : coords_count_map.iter ()) + { + if (_.second == 1) continue; + shared_coords.push (_.first); + } + + /* no shared tuples: no coords are used more than once */ + if (!shared_coords) return true; + /* sorting based on the coords frequency first (high to low), then compare + * the coords bytes */ + hb_qsort (shared_coords.arrayZ, shared_coords.length, sizeof (hb_vector_t<char>*), _cmp_coords, (void *) (&coords_count_map)); + + /* build shared_coords->idx map and shared tuples byte array */ + + shared_tuples_count = hb_min (0xFFFu + 1, shared_coords.length); + unsigned len = shared_tuples_count * (shared_coords[0]->length); + if (unlikely (!compiled_shared_tuples.alloc (len))) + return false; + + for (unsigned i = 0; i < shared_tuples_count; i++) + { + shared_tuples_idx_map.set (shared_coords[i], i); + /* add a concat() in hb_vector_t? */ + for (char c : shared_coords[i]->iter ()) + compiled_shared_tuples.push (c); + } + + return true; + } + + static int _cmp_coords (const void *pa, const void *pb, void *arg) + { + const hb_hashmap_t<const hb_vector_t<char>*, unsigned>* coords_count_map = + reinterpret_cast<const hb_hashmap_t<const hb_vector_t<char>*, unsigned>*> (arg); + + /* shared_coords is hb_vector_t<const hb_vector_t<char>*> so casting pa/pb + * to be a pointer to a pointer */ + const hb_vector_t<char>** a = reinterpret_cast<const hb_vector_t<char>**> (const_cast<void*>(pa)); + const hb_vector_t<char>** b = reinterpret_cast<const hb_vector_t<char>**> (const_cast<void*>(pb)); + + bool has_a = coords_count_map->has (*a); + bool has_b = coords_count_map->has (*b); + + if (has_a && has_b) + { + unsigned a_num = coords_count_map->get (*a); + unsigned b_num = coords_count_map->get (*b); + + if (a_num != b_num) + return b_num - a_num; + + return (*b)->as_array().cmp ((*a)->as_array ()); + } + else if (has_a) return -1; + else if (has_b) return 1; + else return 0; + } + + template<typename Iterator, + hb_requires (hb_is_iterator (Iterator))> + bool serialize_glyph_var_data (hb_serialize_context_t *c, + Iterator it, + bool long_offset, + unsigned num_glyphs, + char* glyph_var_data_offsets /* OUT: glyph var data offsets array */) const + { + TRACE_SERIALIZE (this); + + if (long_offset) + { + ((HBUINT32 *) glyph_var_data_offsets)[0] = 0; + glyph_var_data_offsets += 4; + } + else + { + ((HBUINT16 *) glyph_var_data_offsets)[0] = 0; + glyph_var_data_offsets += 2; + } + unsigned glyph_offset = 0; + hb_codepoint_t last_gid = 0; + unsigned idx = 0; + + TupleVariationData* cur_glyph = c->start_embed<TupleVariationData> (); + if (!cur_glyph) return_trace (false); + for (auto &_ : it) + { + hb_codepoint_t gid = _.first; + if (long_offset) + for (; last_gid < gid; last_gid++) + ((HBUINT32 *) glyph_var_data_offsets)[last_gid] = glyph_offset; + else + for (; last_gid < gid; last_gid++) + ((HBUINT16 *) glyph_var_data_offsets)[last_gid] = glyph_offset / 2; + + if (idx >= glyph_variations.length) return_trace (false); + if (!cur_glyph->serialize (c, true, glyph_variations[idx])) return_trace (false); + TupleVariationData* next_glyph = c->start_embed<TupleVariationData> (); + glyph_offset += (char *) next_glyph - (char *) cur_glyph; + + if (long_offset) + ((HBUINT32 *) glyph_var_data_offsets)[gid] = glyph_offset; + else + ((HBUINT16 *) glyph_var_data_offsets)[gid] = glyph_offset / 2; + + last_gid++; + idx++; + cur_glyph = next_glyph; + } + + if (long_offset) + for (; last_gid < num_glyphs; last_gid++) + ((HBUINT32 *) glyph_var_data_offsets)[last_gid] = glyph_offset; + else + for (; last_gid < num_glyphs; last_gid++) + ((HBUINT16 *) glyph_var_data_offsets)[last_gid] = glyph_offset / 2; + return_trace (true); + } +}; + +struct gvar +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_gvar; + + bool sanitize_shallow (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + hb_barrier () && + (version.major == 1) && + sharedTuples.sanitize (c, this, axisCount * sharedTupleCount) && + (is_long_offset () ? + c->check_array (get_long_offset_array (), c->get_num_glyphs () + 1) : + c->check_array (get_short_offset_array (), c->get_num_glyphs () + 1))); + } + + /* GlyphVariationData not sanitized here; must be checked while accessing each glyph variation data */ + bool sanitize (hb_sanitize_context_t *c) const + { return sanitize_shallow (c); } + + bool decompile_glyph_variations (hb_subset_context_t *c, + glyph_variations_t& glyph_vars /* OUT */) const + { + hb_hashmap_t<hb_codepoint_t, hb_bytes_t> new_gid_var_data_map; + auto it = hb_iter (c->plan->new_to_old_gid_list); + if (it->first == 0 && !(c->plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)) + { + new_gid_var_data_map.set (0, hb_bytes_t ()); + it++; + } + + for (auto &_ : it) + { + hb_codepoint_t new_gid = _.first; + hb_codepoint_t old_gid = _.second; + hb_bytes_t var_data_bytes = get_glyph_var_data_bytes (c->source_blob, glyphCountX, old_gid); + new_gid_var_data_map.set (new_gid, var_data_bytes); + } + + if (new_gid_var_data_map.in_error ()) return false; + + hb_array_t<const F2DOT14> shared_tuples = (this+sharedTuples).as_array ((unsigned) sharedTupleCount * (unsigned) axisCount); + return glyph_vars.create_from_glyphs_var_data (axisCount, shared_tuples, c->plan, new_gid_var_data_map); + } + + template<typename Iterator, + hb_requires (hb_is_iterator (Iterator))> + bool serialize (hb_serialize_context_t *c, + const glyph_variations_t& glyph_vars, + Iterator it, + unsigned axis_count, + unsigned num_glyphs) const + { + TRACE_SERIALIZE (this); + gvar *out = c->allocate_min<gvar> (); + if (unlikely (!out)) return_trace (false); + + out->version.major = 1; + out->version.minor = 0; + out->axisCount = axis_count; + out->glyphCountX = hb_min (0xFFFFu, num_glyphs); + + unsigned glyph_var_data_size = glyph_vars.compiled_byte_size (); + bool long_offset = glyph_var_data_size & ~0xFFFFu; + out->flags = long_offset ? 1 : 0; + + HBUINT8 *glyph_var_data_offsets = c->allocate_size<HBUINT8> ((long_offset ? 4 : 2) * (num_glyphs + 1), false); + if (!glyph_var_data_offsets) return_trace (false); + + /* shared tuples */ + unsigned shared_tuple_count = glyph_vars.compiled_shared_tuples_count (); + out->sharedTupleCount = shared_tuple_count; + + if (!shared_tuple_count) + out->sharedTuples = 0; + else + { + hb_array_t<const char> shared_tuples = glyph_vars.compiled_shared_tuples.as_array ().copy (c); + if (!shared_tuples.arrayZ) return_trace (false); + out->sharedTuples = shared_tuples.arrayZ - (char *) out; + } + + char *glyph_var_data = c->start_embed<char> (); + if (!glyph_var_data) return_trace (false); + out->dataZ = glyph_var_data - (char *) out; + + return_trace (glyph_vars.serialize_glyph_var_data (c, it, long_offset, num_glyphs, + (char *) glyph_var_data_offsets)); + } + + bool instantiate (hb_subset_context_t *c) const + { + TRACE_SUBSET (this); + glyph_variations_t glyph_vars; + if (!decompile_glyph_variations (c, glyph_vars)) + return_trace (false); + + if (!glyph_vars.instantiate (c->plan)) return_trace (false); + if (!glyph_vars.compile_bytes (c->plan->axes_index_map, c->plan->axes_old_index_tag_map)) + return_trace (false); + + unsigned axis_count = c->plan->axes_index_map.get_population (); + unsigned num_glyphs = c->plan->num_output_glyphs (); + auto it = hb_iter (c->plan->new_to_old_gid_list); + return_trace (serialize (c->serializer, glyph_vars, it, axis_count, num_glyphs)); + } + + bool subset (hb_subset_context_t *c) const + { + TRACE_SUBSET (this); + if (c->plan->all_axes_pinned) + return_trace (false); + + if (c->plan->normalized_coords) + return_trace (instantiate (c)); + + unsigned glyph_count = version.to_int () ? c->plan->source->get_num_glyphs () : 0; + + gvar *out = c->serializer->allocate_min<gvar> (); + if (unlikely (!out)) return_trace (false); + + out->version.major = 1; + out->version.minor = 0; + out->axisCount = axisCount; + out->sharedTupleCount = sharedTupleCount; + + unsigned int num_glyphs = c->plan->num_output_glyphs (); + out->glyphCountX = hb_min (0xFFFFu, num_glyphs); + + auto it = hb_iter (c->plan->new_to_old_gid_list); + if (it->first == 0 && !(c->plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)) + it++; + unsigned int subset_data_size = 0; + for (auto &_ : it) + { + hb_codepoint_t old_gid = _.second; + subset_data_size += get_glyph_var_data_bytes (c->source_blob, glyph_count, old_gid).length; + } + + bool long_offset = (subset_data_size & ~0xFFFFu); + #ifdef HB_EXPERIMENTAL_API + long_offset = long_offset || (c->plan->flags & HB_SUBSET_FLAGS_IFTB_REQUIREMENTS); +#endif + out->flags = long_offset ? 1 : 0; + + HBUINT8 *subset_offsets = c->serializer->allocate_size<HBUINT8> ((long_offset ? 4 : 2) * (num_glyphs + 1), false); + if (!subset_offsets) return_trace (false); + + /* shared tuples */ + if (!sharedTupleCount || !sharedTuples) + out->sharedTuples = 0; + else + { + unsigned int shared_tuple_size = F2DOT14::static_size * axisCount * sharedTupleCount; + F2DOT14 *tuples = c->serializer->allocate_size<F2DOT14> (shared_tuple_size); + if (!tuples) return_trace (false); + out->sharedTuples = (char *) tuples - (char *) out; + hb_memcpy (tuples, this+sharedTuples, shared_tuple_size); + } + + /* This ordering relative to the shared tuples array, which puts the glyphVariationData + last in the table, is required when HB_SUBSET_FLAGS_IFTB_REQUIREMENTS is set */ + char *subset_data = c->serializer->allocate_size<char> (subset_data_size, false); + if (!subset_data) return_trace (false); + out->dataZ = subset_data - (char *) out; + + + if (long_offset) + { + ((HBUINT32 *) subset_offsets)[0] = 0; + subset_offsets += 4; + } + else + { + ((HBUINT16 *) subset_offsets)[0] = 0; + subset_offsets += 2; + } + unsigned int glyph_offset = 0; + + hb_codepoint_t last = 0; + it = hb_iter (c->plan->new_to_old_gid_list); + if (it->first == 0 && !(c->plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)) + it++; + for (auto &_ : it) + { + hb_codepoint_t gid = _.first; + hb_codepoint_t old_gid = _.second; + + if (long_offset) + for (; last < gid; last++) + ((HBUINT32 *) subset_offsets)[last] = glyph_offset; + else + for (; last < gid; last++) + ((HBUINT16 *) subset_offsets)[last] = glyph_offset / 2; + + hb_bytes_t var_data_bytes = get_glyph_var_data_bytes (c->source_blob, + glyph_count, + old_gid); + + hb_memcpy (subset_data, var_data_bytes.arrayZ, var_data_bytes.length); + subset_data += var_data_bytes.length; + glyph_offset += var_data_bytes.length; + + if (long_offset) + ((HBUINT32 *) subset_offsets)[gid] = glyph_offset; + else + ((HBUINT16 *) subset_offsets)[gid] = glyph_offset / 2; + + last++; // Skip over gid + } + + if (long_offset) + for (; last < num_glyphs; last++) + ((HBUINT32 *) subset_offsets)[last] = glyph_offset; + else + for (; last < num_glyphs; last++) + ((HBUINT16 *) subset_offsets)[last] = glyph_offset / 2; + + return_trace (true); + } + + protected: + const hb_bytes_t get_glyph_var_data_bytes (hb_blob_t *blob, + unsigned glyph_count, + hb_codepoint_t glyph) const + { + unsigned start_offset = get_offset (glyph_count, glyph); + unsigned end_offset = get_offset (glyph_count, glyph+1); + if (unlikely (end_offset < start_offset)) return hb_bytes_t (); + unsigned length = end_offset - start_offset; + hb_bytes_t var_data = blob->as_bytes ().sub_array (((unsigned) dataZ) + start_offset, length); + return likely (var_data.length >= GlyphVariationData::min_size) ? var_data : hb_bytes_t (); + } + + bool is_long_offset () const { return flags & 1; } + + unsigned get_offset (unsigned glyph_count, unsigned i) const + { + if (unlikely (i > glyph_count)) return 0; + _hb_compiler_memory_r_barrier (); + return is_long_offset () ? get_long_offset_array ()[i] : get_short_offset_array ()[i] * 2; + } + + const HBUINT32 * get_long_offset_array () const { return (const HBUINT32 *) &offsetZ; } + const HBUINT16 *get_short_offset_array () const { return (const HBUINT16 *) &offsetZ; } + + public: + struct accelerator_t + { + accelerator_t (hb_face_t *face) + { + table = hb_sanitize_context_t ().reference_table<gvar> (face); + /* If sanitize failed, set glyphCount to 0. */ + glyphCount = table->version.to_int () ? face->get_num_glyphs () : 0; + + /* For shared tuples that only have one axis active, shared the index of + * that axis as a cache. This will speed up caclulate_scalar() a lot + * for fonts with lots of axes and many "monovar" tuples. */ + hb_array_t<const F2DOT14> shared_tuples = (table+table->sharedTuples).as_array (table->sharedTupleCount * table->axisCount); + unsigned count = table->sharedTupleCount; + if (unlikely (!shared_tuple_active_idx.resize (count, false))) return; + unsigned axis_count = table->axisCount; + for (unsigned i = 0; i < count; i++) + { + hb_array_t<const F2DOT14> tuple = shared_tuples.sub_array (axis_count * i, axis_count); + int idx1 = -1, idx2 = -1; + for (unsigned j = 0; j < axis_count; j++) + { + const F2DOT14 &peak = tuple.arrayZ[j]; + if (peak.to_int () != 0) + { + if (idx1 == -1) + idx1 = j; + else if (idx2 == -1) + idx2 = j; + else + { + idx1 = idx2 = -1; + break; + } + } + } + shared_tuple_active_idx.arrayZ[i] = {idx1, idx2}; + } + } + ~accelerator_t () { table.destroy (); } + + private: + + static float infer_delta (const hb_array_t<contour_point_t> points, + const hb_array_t<contour_point_t> deltas, + unsigned int target, unsigned int prev, unsigned int next, + float contour_point_t::*m) + { + float target_val = points.arrayZ[target].*m; + float prev_val = points.arrayZ[prev].*m; + float next_val = points.arrayZ[next].*m; + float prev_delta = deltas.arrayZ[prev].*m; + float next_delta = deltas.arrayZ[next].*m; + + if (prev_val == next_val) + return (prev_delta == next_delta) ? prev_delta : 0.f; + else if (target_val <= hb_min (prev_val, next_val)) + return (prev_val < next_val) ? prev_delta : next_delta; + else if (target_val >= hb_max (prev_val, next_val)) + return (prev_val > next_val) ? prev_delta : next_delta; + + /* linear interpolation */ + float r = (target_val - prev_val) / (next_val - prev_val); + return prev_delta + r * (next_delta - prev_delta); + } + + static unsigned int next_index (unsigned int i, unsigned int start, unsigned int end) + { return (i >= end) ? start : (i + 1); } + + public: + bool apply_deltas_to_points (hb_codepoint_t glyph, + hb_array_t<int> coords, + const hb_array_t<contour_point_t> points, + bool phantom_only = false) const + { + if (unlikely (glyph >= glyphCount)) return true; + + hb_bytes_t var_data_bytes = table->get_glyph_var_data_bytes (table.get_blob (), glyphCount, glyph); + if (!var_data_bytes.as<GlyphVariationData> ()->has_data ()) return true; + hb_vector_t<unsigned int> shared_indices; + GlyphVariationData::tuple_iterator_t iterator; + if (!GlyphVariationData::get_tuple_iterator (var_data_bytes, table->axisCount, + var_data_bytes.arrayZ, + shared_indices, &iterator)) + return true; /* so isn't applied at all */ + + /* Save original points for inferred delta calculation */ + contour_point_vector_t orig_points_vec; // Populated lazily + auto orig_points = orig_points_vec.as_array (); + + /* flag is used to indicate referenced point */ + contour_point_vector_t deltas_vec; // Populated lazily + auto deltas = deltas_vec.as_array (); + + hb_vector_t<unsigned> end_points; // Populated lazily + + unsigned num_coords = table->axisCount; + hb_array_t<const F2DOT14> shared_tuples = (table+table->sharedTuples).as_array (table->sharedTupleCount * num_coords); + + hb_vector_t<unsigned int> private_indices; + hb_vector_t<int> x_deltas; + hb_vector_t<int> y_deltas; + unsigned count = points.length; + bool flush = false; + do + { + float scalar = iterator.current_tuple->calculate_scalar (coords, num_coords, shared_tuples, + &shared_tuple_active_idx); + if (scalar == 0.f) continue; + 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))) + return false; + + if (!deltas) + { + if (unlikely (!deltas_vec.resize (count, false))) return false; + deltas = deltas_vec.as_array (); + hb_memset (deltas.arrayZ + (phantom_only ? count - 4 : 0), 0, + (phantom_only ? 4 : count) * sizeof (deltas[0])); + } + + const HBUINT8 *end = p + length; + + bool has_private_points = iterator.current_tuple->has_private_points (); + if (has_private_points && + !GlyphVariationData::unpack_points (p, private_indices, end)) + return false; + const hb_array_t<unsigned int> &indices = has_private_points ? private_indices : shared_indices; + + bool apply_to_all = (indices.length == 0); + unsigned int num_deltas = apply_to_all ? points.length : indices.length; + if (unlikely (!x_deltas.resize (num_deltas, false))) return false; + if (unlikely (!GlyphVariationData::unpack_deltas (p, x_deltas, end))) return false; + if (unlikely (!y_deltas.resize (num_deltas, false))) return false; + if (unlikely (!GlyphVariationData::unpack_deltas (p, y_deltas, end))) return false; + + if (!apply_to_all) + { + if (!orig_points && !phantom_only) + { + orig_points_vec.extend (points); + if (unlikely (orig_points_vec.in_error ())) return false; + orig_points = orig_points_vec.as_array (); + } + + if (flush) + { + for (unsigned int i = phantom_only ? count - 4 : 0; i < count; i++) + points.arrayZ[i].translate (deltas.arrayZ[i]); + flush = false; + + } + hb_memset (deltas.arrayZ + (phantom_only ? count - 4 : 0), 0, + (phantom_only ? 4 : count) * sizeof (deltas[0])); + } + + if (HB_OPTIMIZE_SIZE_VAL) + { + for (unsigned int i = 0; i < num_deltas; i++) + { + unsigned int pt_index; + if (apply_to_all) + pt_index = i; + else + { + pt_index = indices[i]; + if (unlikely (pt_index >= deltas.length)) continue; + } + if (phantom_only && pt_index < count - 4) continue; + auto &delta = deltas.arrayZ[pt_index]; + delta.flag = 1; /* this point is referenced, i.e., explicit deltas specified */ + delta.x += x_deltas.arrayZ[i] * scalar; + delta.y += y_deltas.arrayZ[i] * scalar; + } + } + else + { + /* Ouch. Four cases... for optimization. */ + if (scalar != 1.0f) + { + if (apply_to_all) + for (unsigned int i = phantom_only ? count - 4 : 0; i < count; i++) + { + unsigned int pt_index = i; + auto &delta = deltas.arrayZ[pt_index]; + delta.x += x_deltas.arrayZ[i] * scalar; + delta.y += y_deltas.arrayZ[i] * scalar; + } + else + for (unsigned int i = 0; i < num_deltas; i++) + { + unsigned int pt_index = indices[i]; + if (unlikely (pt_index >= deltas.length)) continue; + if (phantom_only && pt_index < count - 4) continue; + auto &delta = deltas.arrayZ[pt_index]; + delta.flag = 1; /* this point is referenced, i.e., explicit deltas specified */ + delta.x += x_deltas.arrayZ[i] * scalar; + delta.y += y_deltas.arrayZ[i] * scalar; + } + } + else + { + if (apply_to_all) + for (unsigned int i = phantom_only ? count - 4 : 0; i < count; i++) + { + unsigned int pt_index = i; + auto &delta = deltas.arrayZ[pt_index]; + delta.x += x_deltas.arrayZ[i]; + delta.y += y_deltas.arrayZ[i]; + } + else + for (unsigned int i = 0; i < num_deltas; i++) + { + unsigned int pt_index = indices[i]; + if (unlikely (pt_index >= deltas.length)) continue; + if (phantom_only && pt_index < count - 4) continue; + auto &delta = deltas.arrayZ[pt_index]; + delta.flag = 1; /* this point is referenced, i.e., explicit deltas specified */ + delta.x += x_deltas.arrayZ[i]; + delta.y += y_deltas.arrayZ[i]; + } + } + } + + /* infer deltas for unreferenced points */ + if (!apply_to_all && !phantom_only) + { + if (!end_points) + { + for (unsigned i = 0; i < count; ++i) + if (points.arrayZ[i].is_end_point) + end_points.push (i); + if (unlikely (end_points.in_error ())) return false; + } + + unsigned start_point = 0; + for (unsigned end_point : end_points) + { + /* Check the number of unreferenced points in a contour. If no unref points or no ref points, nothing to do. */ + unsigned unref_count = 0; + for (unsigned i = start_point; i < end_point + 1; i++) + unref_count += deltas.arrayZ[i].flag; + unref_count = (end_point - start_point + 1) - unref_count; + + unsigned j = start_point; + if (unref_count == 0 || unref_count > end_point - start_point) + goto no_more_gaps; + + for (;;) + { + /* Locate the next gap of unreferenced points between two referenced points prev and next. + * Note that a gap may wrap around at left (start_point) and/or at right (end_point). + */ + unsigned int prev, next, i; + for (;;) + { + i = j; + j = next_index (i, start_point, end_point); + if (deltas.arrayZ[i].flag && !deltas.arrayZ[j].flag) break; + } + prev = j = i; + for (;;) + { + i = j; + j = next_index (i, start_point, end_point); + if (!deltas.arrayZ[i].flag && deltas.arrayZ[j].flag) break; + } + next = j; + /* Infer deltas for all unref points in the gap between prev and next */ + i = prev; + for (;;) + { + i = next_index (i, start_point, end_point); + if (i == next) break; + deltas.arrayZ[i].x = infer_delta (orig_points, deltas, i, prev, next, &contour_point_t::x); + deltas.arrayZ[i].y = infer_delta (orig_points, deltas, i, prev, next, &contour_point_t::y); + if (--unref_count == 0) goto no_more_gaps; + } + } + no_more_gaps: + start_point = end_point + 1; + } + } + + flush = true; + + } while (iterator.move_to_next ()); + + if (flush) + { + for (unsigned int i = phantom_only ? count - 4 : 0; i < count; i++) + points.arrayZ[i].translate (deltas.arrayZ[i]); + } + + return true; + } + + unsigned int get_axis_count () const { return table->axisCount; } + + private: + hb_blob_ptr_t<gvar> table; + unsigned glyphCount; + hb_vector_t<hb_pair_t<int, int>> shared_tuple_active_idx; + }; + + protected: + FixedVersion<>version; /* Version number of the glyph variations table + * Set to 0x00010000u. */ + HBUINT16 axisCount; /* The number of variation axes for this font. This must be + * the same number as axisCount in the 'fvar' table. */ + HBUINT16 sharedTupleCount; + /* The number of shared tuple records. Shared tuple records + * can be referenced within glyph variation data tables for + * multiple glyphs, as opposed to other tuple records stored + * directly within a glyph variation data table. */ + NNOffset32To<UnsizedArrayOf<F2DOT14>> + sharedTuples; /* Offset from the start of this table to the shared tuple records. + * Array of tuple records shared across all glyph variation data tables. */ + HBUINT16 glyphCountX; /* The number of glyphs in this font. This must match the number of + * glyphs stored elsewhere in the font. */ + HBUINT16 flags; /* Bit-field that gives the format of the offset array that follows. + * If bit 0 is clear, the offsets are uint16; if bit 0 is set, the + * offsets are uint32. */ + Offset32To<GlyphVariationData> + dataZ; /* Offset from the start of this table to the array of + * GlyphVariationData tables. */ + UnsizedArrayOf<HBUINT8> + offsetZ; /* Offsets from the start of the GlyphVariationData array + * to each GlyphVariationData table. */ + public: + DEFINE_SIZE_ARRAY (20, offsetZ); +}; + +struct gvar_accelerator_t : gvar::accelerator_t { + gvar_accelerator_t (hb_face_t *face) : gvar::accelerator_t (face) {} +}; + +} /* namespace OT */ + +#endif /* HB_OT_VAR_GVAR_TABLE_HH */ |