#ifndef OT_GLYF_GLYF_HH #define OT_GLYF_GLYF_HH #include "../../hb-open-type.hh" #include "../../hb-ot-head-table.hh" #include "../../hb-ot-hmtx-table.hh" #include "../../hb-ot-var-gvar-table.hh" #include "../../hb-draw.hh" #include "glyf-helpers.hh" #include "Glyph.hh" #include "SubsetGlyph.hh" #include "loca.hh" #include "path-builder.hh" namespace OT { /* * glyf -- TrueType Glyph Data * https://docs.microsoft.com/en-us/typography/opentype/spec/glyf */ #define HB_OT_TAG_glyf HB_TAG('g','l','y','f') struct glyf { friend struct glyf_accelerator_t; static constexpr hb_tag_t tableTag = HB_OT_TAG_glyf; bool sanitize (hb_sanitize_context_t *c HB_UNUSED) const { TRACE_SANITIZE (this); /* Runtime checks as eager sanitizing each glyph is costy */ return_trace (true); } /* requires source of SubsetGlyph complains the identifier isn't declared */ template bool serialize (hb_serialize_context_t *c, Iterator it, bool use_short_loca, const hb_subset_plan_t *plan) { TRACE_SERIALIZE (this); unsigned init_len = c->length (); for (const auto &_ : it) _.serialize (c, use_short_loca, plan); /* As a special case when all glyph in the font are empty, add a zero byte * to the table, so that OTS doesn’t reject it, and to make the table work * on Windows as well. * See https://github.com/khaledhosny/ots/issues/52 */ if (init_len == c->length ()) { HBUINT8 empty_byte; empty_byte = 0; c->copy (empty_byte); } return_trace (true); } /* Byte region(s) per glyph to output unpadded, hints removed if so requested If we fail to process a glyph we produce an empty (0-length) glyph */ bool subset (hb_subset_context_t *c) const { TRACE_SUBSET (this); glyf *glyf_prime = c->serializer->start_embed (); if (unlikely (!c->serializer->check_success (glyf_prime))) return_trace (false); hb_vector_t glyphs; _populate_subset_glyphs (c->plan, &glyphs); auto padded_offsets = + hb_iter (glyphs) | hb_map (&glyf_impl::SubsetGlyph::padded_size) ; unsigned max_offset = + padded_offsets | hb_reduce (hb_add, 0); bool use_short_loca = max_offset < 0x1FFFF; glyf_prime->serialize (c->serializer, hb_iter (glyphs), use_short_loca, c->plan); if (!use_short_loca) { padded_offsets = + hb_iter (glyphs) | hb_map (&glyf_impl::SubsetGlyph::length) ; } if (unlikely (c->serializer->in_error ())) return_trace (false); return_trace (c->serializer->check_success (glyf_impl::_add_loca_and_head (c->plan, padded_offsets, use_short_loca))); } void _populate_subset_glyphs (const hb_subset_plan_t *plan, hb_vector_t *glyphs /* OUT */) const; protected: UnsizedArrayOf dataZ; /* Glyphs data. */ public: DEFINE_SIZE_MIN (0); /* In reality, this is UNBOUNDED() type; but since we always * check the size externally, allow Null() object of it by * defining it _MIN instead. */ }; struct glyf_accelerator_t { glyf_accelerator_t (hb_face_t *face) { short_offset = false; num_glyphs = 0; loca_table = nullptr; glyf_table = nullptr; #ifndef HB_NO_VAR gvar = nullptr; #endif hmtx = nullptr; #ifndef HB_NO_VERTICAL vmtx = nullptr; #endif const OT::head &head = *face->table.head; if (head.indexToLocFormat > 1 || head.glyphDataFormat > 0) /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */ return; short_offset = 0 == head.indexToLocFormat; loca_table = face->table.loca.get_blob (); // Needs no destruct! glyf_table = hb_sanitize_context_t ().reference_table (face); #ifndef HB_NO_VAR gvar = face->table.gvar; #endif hmtx = face->table.hmtx; #ifndef HB_NO_VERTICAL vmtx = face->table.vmtx; #endif num_glyphs = hb_max (1u, loca_table.get_length () / (short_offset ? 2 : 4)) - 1; num_glyphs = hb_min (num_glyphs, face->get_num_glyphs ()); } ~glyf_accelerator_t () { glyf_table.destroy (); } bool has_data () const { return num_glyphs; } protected: template bool get_points (hb_font_t *font, hb_codepoint_t gid, T consumer) const { if (gid >= num_glyphs) return false; /* Making this allocfree is not that easy https://github.com/harfbuzz/harfbuzz/issues/2095 mostly because of gvar handling in VF fonts, perhaps a separate path for non-VF fonts can be considered */ contour_point_vector_t all_points; bool phantom_only = !consumer.is_consuming_contour_points (); if (unlikely (!glyph_for_gid (gid).get_points (font, *this, all_points, phantom_only))) return false; if (consumer.is_consuming_contour_points ()) { unsigned count = all_points.length; assert (count >= glyf_impl::PHANTOM_COUNT); count -= glyf_impl::PHANTOM_COUNT; for (unsigned point_index = 0; point_index < count; point_index++) consumer.consume_point (all_points[point_index]); consumer.points_end (); } /* Where to write phantoms, nullptr if not requested */ contour_point_t *phantoms = consumer.get_phantoms_sink (); if (phantoms) for (unsigned i = 0; i < glyf_impl::PHANTOM_COUNT; ++i) phantoms[i] = all_points[all_points.length - glyf_impl::PHANTOM_COUNT + i]; return true; } #ifndef HB_NO_VAR struct points_aggregator_t { hb_font_t *font; hb_glyph_extents_t *extents; contour_point_t *phantoms; struct contour_bounds_t { contour_bounds_t () { min_x = min_y = FLT_MAX; max_x = max_y = -FLT_MAX; } void add (const contour_point_t &p) { min_x = hb_min (min_x, p.x); min_y = hb_min (min_y, p.y); max_x = hb_max (max_x, p.x); max_y = hb_max (max_y, p.y); } bool empty () const { return (min_x >= max_x) || (min_y >= max_y); } void get_extents (hb_font_t *font, hb_glyph_extents_t *extents) { if (unlikely (empty ())) { extents->width = 0; extents->x_bearing = 0; extents->height = 0; extents->y_bearing = 0; return; } extents->x_bearing = font->em_scalef_x (min_x); extents->width = font->em_scalef_x (max_x) - extents->x_bearing; extents->y_bearing = font->em_scalef_y (max_y); extents->height = font->em_scalef_y (min_y) - extents->y_bearing; } protected: float min_x, min_y, max_x, max_y; } bounds; points_aggregator_t (hb_font_t *font_, hb_glyph_extents_t *extents_, contour_point_t *phantoms_) { font = font_; extents = extents_; phantoms = phantoms_; if (extents) bounds = contour_bounds_t (); } void consume_point (const contour_point_t &point) { bounds.add (point); } void points_end () { bounds.get_extents (font, extents); } bool is_consuming_contour_points () { return extents; } contour_point_t *get_phantoms_sink () { return phantoms; } }; public: unsigned get_advance_var (hb_font_t *font, hb_codepoint_t gid, bool is_vertical) const { if (unlikely (gid >= num_glyphs)) return 0; bool success = false; contour_point_t phantoms[glyf_impl::PHANTOM_COUNT]; if (likely (font->num_coords == gvar->get_axis_count ())) success = get_points (font, gid, points_aggregator_t (font, nullptr, phantoms)); if (unlikely (!success)) return #ifndef HB_NO_VERTICAL is_vertical ? vmtx->get_advance (gid) : #endif hmtx->get_advance (gid); float result = is_vertical ? phantoms[glyf_impl::PHANTOM_TOP].y - phantoms[glyf_impl::PHANTOM_BOTTOM].y : phantoms[glyf_impl::PHANTOM_RIGHT].x - phantoms[glyf_impl::PHANTOM_LEFT].x; return hb_clamp (roundf (result), 0.f, (float) UINT_MAX / 2); } int get_side_bearing_var (hb_font_t *font, hb_codepoint_t gid, bool is_vertical) const { if (unlikely (gid >= num_glyphs)) return 0; hb_glyph_extents_t extents; contour_point_t phantoms[glyf_impl::PHANTOM_COUNT]; if (unlikely (!get_points (font, gid, points_aggregator_t (font, &extents, phantoms)))) return #ifndef HB_NO_VERTICAL is_vertical ? vmtx->get_side_bearing (gid) : #endif hmtx->get_side_bearing (gid); return is_vertical ? roundf (phantoms[glyf_impl::PHANTOM_TOP].y) - extents.y_bearing : roundf (phantoms[glyf_impl::PHANTOM_LEFT].x); } #endif public: bool get_extents (hb_font_t *font, hb_codepoint_t gid, hb_glyph_extents_t *extents) const { if (unlikely (gid >= num_glyphs)) return false; #ifndef HB_NO_VAR if (font->num_coords) return get_points (font, gid, points_aggregator_t (font, extents, nullptr)); #endif return glyph_for_gid (gid).get_extents (font, *this, extents); } const glyf_impl::Glyph glyph_for_gid (hb_codepoint_t gid, bool needs_padding_removal = false) const { if (unlikely (gid >= num_glyphs)) return glyf_impl::Glyph (); unsigned int start_offset, end_offset; if (short_offset) { const HBUINT16 *offsets = (const HBUINT16 *) loca_table->dataZ.arrayZ; start_offset = 2 * offsets[gid]; end_offset = 2 * offsets[gid + 1]; } else { const HBUINT32 *offsets = (const HBUINT32 *) loca_table->dataZ.arrayZ; start_offset = offsets[gid]; end_offset = offsets[gid + 1]; } if (unlikely (start_offset > end_offset || end_offset > glyf_table.get_length ())) return glyf_impl::Glyph (); glyf_impl::Glyph glyph (hb_bytes_t ((const char *) this->glyf_table + start_offset, end_offset - start_offset), gid); return needs_padding_removal ? glyf_impl::Glyph (glyph.trim_padding (), gid) : glyph; } bool get_path (hb_font_t *font, hb_codepoint_t gid, hb_draw_session_t &draw_session) const { return get_points (font, gid, glyf_impl::path_builder_t (font, draw_session)); } #ifndef HB_NO_VAR const gvar_accelerator_t *gvar; #endif const hmtx_accelerator_t *hmtx; #ifndef HB_NO_VERTICAL const vmtx_accelerator_t *vmtx; #endif private: bool short_offset; unsigned int num_glyphs; hb_blob_ptr_t loca_table; hb_blob_ptr_t glyf_table; }; inline void glyf::_populate_subset_glyphs (const hb_subset_plan_t *plan, hb_vector_t *glyphs /* OUT */) const { OT::glyf_accelerator_t glyf (plan->source); + hb_range (plan->num_output_glyphs ()) | hb_map ([&] (hb_codepoint_t new_gid) { glyf_impl::SubsetGlyph subset_glyph = {0}; subset_glyph.new_gid = new_gid; /* should never fail: all old gids should be mapped */ if (!plan->old_gid_for_new_gid (new_gid, &subset_glyph.old_gid)) return subset_glyph; if (new_gid == 0 && !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)) subset_glyph.source_glyph = glyf_impl::Glyph (); else subset_glyph.source_glyph = glyf.glyph_for_gid (subset_glyph.old_gid, true); if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING) subset_glyph.drop_hints_bytes (); else subset_glyph.dest_start = subset_glyph.source_glyph.get_bytes (); return subset_glyph; }) | hb_sink (glyphs) ; } } /* namespace OT */ #endif /* OT_GLYF_GLYF_HH */