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+/*
+ * 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 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 transform (const float (&matrix)[4])
+ {
+ float x_ = x * matrix[0] + y * matrix[2];
+ y = x * matrix[1] + y * matrix[3];
+ x = x_;
+ }
+ 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, false)))
+ return;
+ auto arrayZ = this->arrayZ + old_len;
+ unsigned count = a.length;
+ hb_memcpy (arrayZ, a.arrayZ, count * sizeof (arrayZ[0]));
+ }
+};
+
+struct GlyphVariationData : TupleVariationData
+{};
+
+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 (), 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 subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+
+ 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);
+
+ 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, glyph_count, 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;
+ hb_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,
+ glyph_count,
+ 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)
+ 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)[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,
+ 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 idx = -1;
+ for (unsigned j = 0; j < axis_count; j++)
+ {
+ const F2DOT14 &peak = tuple.arrayZ[j];
+ if (peak.to_int () != 0)
+ {
+ if (idx != -1)
+ {
+ idx = -1;
+ break;
+ }
+ idx = j;
+ }
+ }
+ shared_tuple_active_idx.arrayZ[i] = idx;
+ }
+ }
+ ~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) const
+ {
+ if (!coords) return true;
+
+ 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;
+ 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 (points.length, false))) return false;
+ deltas = deltas_vec.as_array ();
+ hb_memset (deltas.arrayZ, 0, deltas.get_size ()); // Faster than vector resize
+ }
+
+ 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)
+ {
+ orig_points_vec.extend (points);
+ if (unlikely (orig_points_vec.in_error ())) return false;
+ orig_points = orig_points_vec.as_array ();
+ }
+
+ if (flush)
+ {
+ unsigned count = points.length;
+ for (unsigned int i = 0; i < count; i++)
+ points.arrayZ[i].translate (deltas.arrayZ[i]);
+ flush = false;
+
+ }
+ hb_memset (deltas.arrayZ, 0, deltas.get_size ());
+ }
+
+ 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;
+ }
+ 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 = 0; i < num_deltas; 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;
+ 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 = 0; i < num_deltas; 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;
+ 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)
+ {
+ if (!end_points)
+ {
+ unsigned count = points.length;
+ 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)
+ {
+ unsigned count = points.length;
+ for (unsigned int i = 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<signed> 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 */
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