| /* |
| * 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" |
| |
| /* |
| * 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 contour_point_t |
| { |
| void init (float x_ = 0.f, float y_ = 0.f, bool is_end_point_ = false) |
| { flag = 0; x = x_; y = y_; is_end_point = is_end_point_; } |
| |
| void translate (const contour_point_t &p) { x += p.x; y += p.y; } |
| |
| float x = 0.f; |
| float y = 0.f; |
| uint8_t flag = 0; |
| bool is_end_point = false; |
| }; |
| |
| struct contour_point_vector_t : hb_vector_t<contour_point_t> |
| { |
| void extend (const hb_array_t<contour_point_t> &a) |
| { |
| unsigned int old_len = length; |
| if (unlikely (!resize (old_len + a.length))) |
| return; |
| auto arrayZ = this->arrayZ + old_len; |
| unsigned count = a.length; |
| for (unsigned int i = 0; i < count; i++) |
| arrayZ[i] = a.arrayZ[i]; |
| } |
| |
| void transform (const float (&matrix)[4]) |
| { |
| if (matrix[0] == 1.f && matrix[1] == 0.f && |
| matrix[2] == 0.f && matrix[3] == 1.f) |
| return; |
| auto arrayZ = this->arrayZ; |
| unsigned count = length; |
| for (unsigned i = 0; i < count; i++) |
| { |
| contour_point_t &p = arrayZ[i]; |
| float x_ = p.x * matrix[0] + p.y * matrix[2]; |
| p.y = p.x * matrix[1] + p.y * matrix[3]; |
| p.x = x_; |
| } |
| } |
| |
| void translate (const contour_point_t& delta) |
| { |
| if (delta.x == 0.f && delta.y == 0.f) |
| return; |
| auto arrayZ = this->arrayZ; |
| unsigned count = length; |
| for (unsigned i = 0; i < count; i++) |
| arrayZ[i].translate (delta); |
| } |
| }; |
| |
| /* https://docs.microsoft.com/en-us/typography/opentype/spec/otvarcommonformats#tuplevariationheader */ |
| struct TupleVariationHeader |
| { |
| 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)); } |
| |
| float calculate_scalar (hb_array_t<int> coords, unsigned int coord_count, |
| const hb_array_t<const F2DOT14> shared_tuples) const |
| { |
| hb_array_t<const F2DOT14> peak_tuple; |
| |
| if (has_peak ()) |
| peak_tuple = get_peak_tuple (coord_count); |
| else |
| { |
| unsigned int index = get_index (); |
| if (unlikely (index * coord_count >= shared_tuples.length)) |
| return 0.f; |
| peak_tuple = shared_tuples.sub_array (coord_count * index, coord_count); |
| } |
| |
| hb_array_t<const F2DOT14> start_tuple; |
| hb_array_t<const F2DOT14> end_tuple; |
| if (has_intermediate ()) |
| { |
| start_tuple = get_start_tuple (coord_count); |
| end_tuple = get_end_tuple (coord_count); |
| } |
| |
| float scalar = 1.f; |
| for (unsigned int i = 0; i < coord_count; i++) |
| { |
| int v = coords[i]; |
| int peak = peak_tuple[i]; |
| if (!peak || v == peak) continue; |
| |
| if (has_intermediate ()) |
| { |
| int start = start_tuple[i]; |
| int end = end_tuple[i]; |
| 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 |
| }; |
| |
| 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); |
| }; |
| |
| struct GlyphVariationData |
| { |
| const TupleVariationHeader &get_tuple_var_header (void) const |
| { return StructAfter<TupleVariationHeader> (data); } |
| |
| struct tuple_iterator_t |
| { |
| void init (hb_bytes_t var_data_bytes_, unsigned int axis_count_) |
| { |
| var_data_bytes = var_data_bytes_; |
| var_data = var_data_bytes_.as<GlyphVariationData> (); |
| index = 0; |
| axis_count = axis_count_; |
| current_tuple = &var_data->get_tuple_var_header (); |
| data_offset = 0; |
| } |
| |
| bool get_shared_indices (hb_vector_t<unsigned int> &shared_indices /* OUT */) |
| { |
| if (var_data->has_shared_point_numbers ()) |
| { |
| const HBUINT8 *base = &(var_data+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))) && |
| 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 &(var_data+var_data->data) + data_offset; } |
| |
| private: |
| const GlyphVariationData *var_data; |
| unsigned int index; |
| unsigned int axis_count; |
| unsigned int data_offset; |
| |
| 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, |
| hb_vector_t<unsigned int> &shared_indices /* OUT */, |
| tuple_iterator_t *iterator /* OUT */) |
| { |
| iterator->init (var_data_bytes, axis_count); |
| 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; |
| |
| uint16_t 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))) return false; |
| |
| unsigned int n = 0; |
| uint16_t i = 0; |
| while (i < count) |
| { |
| if (unlikely (p + 1 > end)) return false; |
| uint16_t j; |
| uint8_t control = *p++; |
| uint16_t run_count = (control & POINT_RUN_COUNT_MASK) + 1; |
| if (control & POINTS_ARE_WORDS) |
| { |
| for (j = 0; j < run_count && i < count; j++, i++) |
| { |
| if (unlikely (p + HBUINT16::static_size > end)) return false; |
| n += *(const HBUINT16 *)p; |
| points[i] = n; |
| p += HBUINT16::static_size; |
| } |
| } |
| else |
| { |
| for (j = 0; j < run_count && i < count; j++, i++) |
| { |
| if (unlikely (p + 1 > end)) return false; |
| n += *p++; |
| points[i] = n; |
| } |
| } |
| if (j < run_count) return false; |
| } |
| return true; |
| } |
| |
| static bool unpack_deltas (const HBUINT8 *&p /* IN/OUT */, |
| hb_vector_t<int> &deltas /* IN/OUT */, |
| const HBUINT8 *end) |
| { |
| enum packed_delta_flag_t |
| { |
| DELTAS_ARE_ZERO = 0x80, |
| DELTAS_ARE_WORDS = 0x40, |
| DELTA_RUN_COUNT_MASK = 0x3F |
| }; |
| |
| unsigned int i = 0; |
| unsigned int count = deltas.length; |
| while (i < count) |
| { |
| if (unlikely (p + 1 > end)) return false; |
| uint8_t control = *p++; |
| unsigned int run_count = (control & DELTA_RUN_COUNT_MASK) + 1; |
| unsigned int j; |
| if (control & DELTAS_ARE_ZERO) |
| for (j = 0; j < run_count && i < count; j++, i++) |
| deltas[i] = 0; |
| else if (control & DELTAS_ARE_WORDS) |
| for (j = 0; j < run_count && i < count; j++, i++) |
| { |
| if (unlikely (p + HBUINT16::static_size > end)) return false; |
| deltas[i] = *(const HBINT16 *) p; |
| p += HBUINT16::static_size; |
| } |
| else |
| for (j = 0; j < run_count && i < count; j++, i++) |
| { |
| if (unlikely (p + 1 > end)) return false; |
| deltas[i] = *(const HBINT8 *) p++; |
| } |
| if (j < run_count) |
| return false; |
| } |
| return true; |
| } |
| |
| bool has_data () const { return tupleVarCount; } |
| |
| protected: |
| struct TupleVarCount : HBUINT16 |
| { |
| bool has_shared_point_numbers () const { return ((*this) & SharedPointNumbers); } |
| unsigned int get_count () const { return (*this) & CountMask; } |
| |
| 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 GlyphVariationData table |
| * to the serialized data. */ |
| /* TupleVariationHeader tupleVariationHeaders[] *//* Array of tuple variation headers. */ |
| public: |
| DEFINE_SIZE_MIN (4); |
| }; |
| |
| 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) && (version.major == 1) && |
| sharedTuples.sanitize (c, this, axisCount * sharedTupleCount) && |
| (is_long_offset () ? |
| c->check_array (get_long_offset_array (), glyphCount+1) : |
| c->check_array (get_short_offset_array (), glyphCount+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 subset (hb_subset_context_t *c) const |
| { |
| TRACE_SUBSET (this); |
| |
| 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->glyphCount = num_glyphs; |
| |
| unsigned int subset_data_size = 0; |
| for (hb_codepoint_t gid = (c->plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE) ? 0 : 1; |
| gid < num_glyphs; |
| gid++) |
| { |
| hb_codepoint_t old_gid; |
| if (!c->plan->old_gid_for_new_gid (gid, &old_gid)) continue; |
| subset_data_size += get_glyph_var_data_bytes (c->source_blob, old_gid).length; |
| } |
| |
| bool long_offset = subset_data_size & ~0xFFFFu; |
| out->flags = long_offset ? 1 : 0; |
| |
| HBUINT8 *subset_offsets = c->serializer->allocate_size<HBUINT8> ((long_offset ? 4 : 2) * (num_glyphs + 1)); |
| 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; |
| memcpy (tuples, this+sharedTuples, shared_tuple_size); |
| } |
| |
| char *subset_data = c->serializer->allocate_size<char> (subset_data_size); |
| if (!subset_data) return_trace (false); |
| out->dataZ = subset_data - (char *) out; |
| |
| unsigned int glyph_offset = 0; |
| for (hb_codepoint_t gid = (c->plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE) ? 0 : 1; |
| gid < num_glyphs; |
| gid++) |
| { |
| hb_codepoint_t old_gid; |
| hb_bytes_t var_data_bytes = c->plan->old_gid_for_new_gid (gid, &old_gid) |
| ? get_glyph_var_data_bytes (c->source_blob, old_gid) |
| : hb_bytes_t (); |
| |
| if (long_offset) |
| ((HBUINT32 *) subset_offsets)[gid] = glyph_offset; |
| else |
| ((HBUINT16 *) subset_offsets)[gid] = glyph_offset / 2; |
| |
| if (var_data_bytes.length > 0) |
| 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)[num_glyphs] = glyph_offset; |
| else |
| ((HBUINT16 *) subset_offsets)[num_glyphs] = glyph_offset / 2; |
| |
| return_trace (true); |
| } |
| |
| protected: |
| const hb_bytes_t get_glyph_var_data_bytes (hb_blob_t *blob, hb_codepoint_t glyph) const |
| { |
| unsigned start_offset = get_offset (glyph); |
| unsigned end_offset = get_offset (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 i) const |
| { |
| if (unlikely (i > glyphCount)) return 0; |
| 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); } |
| ~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[target].*m; |
| float prev_val = points[prev].*m; |
| float next_val = points[next].*m; |
| float prev_delta = deltas[prev].*m; |
| float next_delta = deltas[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_font_t *font, |
| const hb_array_t<contour_point_t> points) const |
| { |
| if (!font->num_coords) return true; |
| |
| if (unlikely (glyph >= table->glyphCount)) return true; |
| |
| hb_bytes_t var_data_bytes = table->get_glyph_var_data_bytes (table.get_blob (), 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, |
| shared_indices, &iterator)) |
| return true; /* so isn't applied at all */ |
| |
| /* Save original points for inferred delta calculation */ |
| contour_point_vector_t orig_points; |
| if (unlikely (!orig_points.resize (points.length))) return false; |
| for (unsigned int i = 0; i < orig_points.length; i++) |
| orig_points.arrayZ[i] = points.arrayZ[i]; |
| |
| contour_point_vector_t deltas; /* flag is used to indicate referenced point */ |
| if (unlikely (!deltas.resize (points.length))) return false; |
| |
| hb_vector_t<unsigned> end_points; |
| for (unsigned i = 0; i < points.length; ++i) |
| if (points[i].is_end_point) |
| end_points.push (i); |
| |
| auto coords = hb_array (font->coords, font->num_coords); |
| unsigned num_coords = table->axisCount; |
| hb_array_t<const F2DOT14> shared_tuples = (table+table->sharedTuples).as_array (table->sharedTupleCount * table->axisCount); |
| |
| hb_vector_t<unsigned int> private_indices; |
| hb_vector_t<int> x_deltas; |
| hb_vector_t<int> y_deltas; |
| do |
| { |
| float scalar = iterator.current_tuple->calculate_scalar (coords, num_coords, shared_tuples); |
| 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; |
| |
| 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))) return false; |
| if (unlikely (!GlyphVariationData::unpack_deltas (p, x_deltas, end))) return false; |
| if (unlikely (!y_deltas.resize (num_deltas))) return false; |
| if (unlikely (!GlyphVariationData::unpack_deltas (p, y_deltas, end))) return false; |
| |
| for (unsigned int i = 0; i < deltas.length; i++) |
| deltas[i].init (); |
| for (unsigned int i = 0; i < num_deltas; i++) |
| { |
| unsigned int pt_index = apply_to_all ? i : indices[i]; |
| if (unlikely (pt_index >= deltas.length)) continue; |
| deltas.arrayZ[pt_index].flag = 1; /* this point is referenced, i.e., explicit deltas specified */ |
| deltas.arrayZ[pt_index].x += x_deltas.arrayZ[i] * scalar; |
| deltas.arrayZ[pt_index].y += y_deltas.arrayZ[i] * scalar; |
| } |
| |
| /* infer deltas for unreferenced points */ |
| unsigned start_point = 0; |
| for (unsigned c = 0; c < end_points.length; c++) |
| { |
| unsigned end_point = end_points[c]; |
| |
| /* 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; i++) |
| if (!deltas[i].flag) 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[i].flag && !deltas[j].flag) break; |
| } |
| prev = j = i; |
| for (;;) |
| { |
| i = j; |
| j = next_index (i, start_point, end_point); |
| if (!deltas[i].flag && deltas[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[i].x = infer_delta (orig_points.as_array (), deltas.as_array (), i, prev, next, &contour_point_t::x); |
| deltas[i].y = infer_delta (orig_points.as_array (), deltas.as_array (), i, prev, next, &contour_point_t::y); |
| if (--unref_count == 0) goto no_more_gaps; |
| } |
| } |
| no_more_gaps: |
| start_point = end_point + 1; |
| } |
| |
| /* apply specified / inferred deltas to points */ |
| for (unsigned int i = 0; i < points.length; i++) |
| { |
| points.arrayZ[i].x += deltas.arrayZ[i].x; |
| points.arrayZ[i].y += deltas.arrayZ[i].y; |
| } |
| } while (iterator.move_to_next ()); |
| |
| return true; |
| } |
| |
| unsigned int get_axis_count () const { return table->axisCount; } |
| |
| private: |
| hb_blob_ptr_t<gvar> table; |
| }; |
| |
| 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 glyphCount; /* 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 */ |