497 lines
14 KiB
C++
497 lines
14 KiB
C++
#ifndef OT_GLYF_GLYF_HH
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#define OT_GLYF_GLYF_HH
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#include "../../hb-open-type.hh"
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#include "../../hb-ot-head-table.hh"
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#include "../../hb-ot-hmtx-table.hh"
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#include "../../hb-ot-var-gvar-table.hh"
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#include "../../hb-draw.hh"
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#include "../../hb-paint.hh"
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#include "glyf-helpers.hh"
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#include "Glyph.hh"
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#include "SubsetGlyph.hh"
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#include "loca.hh"
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#include "path-builder.hh"
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namespace OT {
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/*
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* glyf -- TrueType Glyph Data
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* https://docs.microsoft.com/en-us/typography/opentype/spec/glyf
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*/
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#define HB_OT_TAG_glyf HB_TAG('g','l','y','f')
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struct glyf
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{
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friend struct glyf_accelerator_t;
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static constexpr hb_tag_t tableTag = HB_OT_TAG_glyf;
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static bool has_valid_glyf_format(const hb_face_t* face)
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{
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const OT::head &head = *face->table.head;
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return head.indexToLocFormat <= 1 && head.glyphDataFormat <= 1;
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}
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bool sanitize (hb_sanitize_context_t *c HB_UNUSED) const
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{
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TRACE_SANITIZE (this);
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/* Runtime checks as eager sanitizing each glyph is costy */
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return_trace (true);
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}
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/* requires source of SubsetGlyph complains the identifier isn't declared */
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template <typename Iterator>
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bool serialize (hb_serialize_context_t *c,
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Iterator it,
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bool use_short_loca,
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const hb_subset_plan_t *plan)
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{
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TRACE_SERIALIZE (this);
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unsigned init_len = c->length ();
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for (auto &_ : it)
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if (unlikely (!_.serialize (c, use_short_loca, plan)))
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return false;
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/* As a special case when all glyph in the font are empty, add a zero byte
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* to the table, so that OTS doesn’t reject it, and to make the table work
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* on Windows as well.
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* See https://github.com/khaledhosny/ots/issues/52 */
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if (init_len == c->length ())
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{
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HBUINT8 empty_byte;
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empty_byte = 0;
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c->copy (empty_byte);
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}
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return_trace (true);
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}
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/* Byte region(s) per glyph to output
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unpadded, hints removed if so requested
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If we fail to process a glyph we produce an empty (0-length) glyph */
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bool subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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if (!has_valid_glyf_format (c->plan->source)) {
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// glyf format is unknown don't attempt to subset it.
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DEBUG_MSG (SUBSET, nullptr,
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"unkown glyf format, dropping from subset.");
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return_trace (false);
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}
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glyf *glyf_prime = c->serializer->start_embed <glyf> ();
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if (unlikely (!c->serializer->check_success (glyf_prime))) return_trace (false);
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hb_font_t *font = nullptr;
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if (c->plan->normalized_coords)
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{
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font = _create_font_for_instancing (c->plan);
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if (unlikely (!font)) return false;
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}
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hb_vector_t<unsigned> padded_offsets;
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unsigned num_glyphs = c->plan->num_output_glyphs ();
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if (unlikely (!padded_offsets.resize (num_glyphs)))
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{
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hb_font_destroy (font);
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return false;
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}
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hb_vector_t<glyf_impl::SubsetGlyph> glyphs;
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if (!_populate_subset_glyphs (c->plan, font, glyphs))
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{
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hb_font_destroy (font);
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return false;
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}
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if (font)
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hb_font_destroy (font);
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unsigned max_offset = 0;
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for (unsigned i = 0; i < num_glyphs; i++)
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{
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padded_offsets[i] = glyphs[i].padded_size ();
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max_offset += padded_offsets[i];
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}
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bool use_short_loca = false;
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if (likely (!c->plan->force_long_loca))
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use_short_loca = max_offset < 0x1FFFF;
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if (!use_short_loca) {
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for (unsigned i = 0; i < num_glyphs; i++)
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padded_offsets[i] = glyphs[i].length ();
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}
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bool result = glyf_prime->serialize (c->serializer, glyphs.writer (), use_short_loca, c->plan);
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if (c->plan->normalized_coords && !c->plan->pinned_at_default)
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_free_compiled_subset_glyphs (glyphs, glyphs.length - 1);
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if (!result) return false;
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if (unlikely (c->serializer->in_error ())) return_trace (false);
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return_trace (c->serializer->check_success (glyf_impl::_add_loca_and_head (c->plan,
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padded_offsets.iter (),
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use_short_loca)));
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}
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bool
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_populate_subset_glyphs (const hb_subset_plan_t *plan,
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hb_font_t *font,
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hb_vector_t<glyf_impl::SubsetGlyph> &glyphs /* OUT */) const;
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hb_font_t *
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_create_font_for_instancing (const hb_subset_plan_t *plan) const;
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void _free_compiled_subset_glyphs (hb_vector_t<glyf_impl::SubsetGlyph> &glyphs, unsigned index) const
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{
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for (unsigned i = 0; i <= index && i < glyphs.length; i++)
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glyphs[i].free_compiled_bytes ();
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}
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protected:
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UnsizedArrayOf<HBUINT8>
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dataZ; /* Glyphs data. */
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public:
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DEFINE_SIZE_MIN (0); /* In reality, this is UNBOUNDED() type; but since we always
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* check the size externally, allow Null() object of it by
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* defining it _MIN instead. */
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};
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struct glyf_accelerator_t
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{
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glyf_accelerator_t (hb_face_t *face)
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{
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short_offset = false;
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num_glyphs = 0;
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loca_table = nullptr;
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glyf_table = nullptr;
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#ifndef HB_NO_VAR
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gvar = nullptr;
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#endif
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hmtx = nullptr;
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#ifndef HB_NO_VERTICAL
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vmtx = nullptr;
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#endif
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const OT::head &head = *face->table.head;
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if (!glyf::has_valid_glyf_format (face))
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/* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */
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return;
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short_offset = 0 == head.indexToLocFormat;
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loca_table = face->table.loca.get_blob (); // Needs no destruct!
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glyf_table = hb_sanitize_context_t ().reference_table<glyf> (face);
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#ifndef HB_NO_VAR
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gvar = face->table.gvar;
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#endif
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hmtx = face->table.hmtx;
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#ifndef HB_NO_VERTICAL
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vmtx = face->table.vmtx;
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#endif
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num_glyphs = hb_max (1u, loca_table.get_length () / (short_offset ? 2 : 4)) - 1;
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num_glyphs = hb_min (num_glyphs, face->get_num_glyphs ());
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}
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~glyf_accelerator_t ()
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{
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glyf_table.destroy ();
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}
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bool has_data () const { return num_glyphs; }
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protected:
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template<typename T>
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bool get_points (hb_font_t *font, hb_codepoint_t gid, T consumer) const
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{
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if (gid >= num_glyphs) return false;
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/* Making this allocfree is not that easy
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https://github.com/harfbuzz/harfbuzz/issues/2095
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mostly because of gvar handling in VF fonts,
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perhaps a separate path for non-VF fonts can be considered */
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contour_point_vector_t all_points;
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bool phantom_only = !consumer.is_consuming_contour_points ();
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if (unlikely (!glyph_for_gid (gid).get_points (font, *this, all_points, nullptr, nullptr, nullptr, true, true, phantom_only)))
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return false;
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if (consumer.is_consuming_contour_points ())
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{
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unsigned count = all_points.length;
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assert (count >= glyf_impl::PHANTOM_COUNT);
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count -= glyf_impl::PHANTOM_COUNT;
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for (unsigned point_index = 0; point_index < count; point_index++)
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consumer.consume_point (all_points[point_index]);
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consumer.points_end ();
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}
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/* Where to write phantoms, nullptr if not requested */
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contour_point_t *phantoms = consumer.get_phantoms_sink ();
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if (phantoms)
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for (unsigned i = 0; i < glyf_impl::PHANTOM_COUNT; ++i)
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phantoms[i] = all_points[all_points.length - glyf_impl::PHANTOM_COUNT + i];
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return true;
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}
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#ifndef HB_NO_VAR
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struct points_aggregator_t
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{
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hb_font_t *font;
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hb_glyph_extents_t *extents;
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contour_point_t *phantoms;
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bool scaled;
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struct contour_bounds_t
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{
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contour_bounds_t () { min_x = min_y = FLT_MAX; max_x = max_y = -FLT_MAX; }
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void add (const contour_point_t &p)
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{
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min_x = hb_min (min_x, p.x);
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min_y = hb_min (min_y, p.y);
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max_x = hb_max (max_x, p.x);
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max_y = hb_max (max_y, p.y);
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}
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bool empty () const { return (min_x >= max_x) || (min_y >= max_y); }
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void get_extents (hb_font_t *font, hb_glyph_extents_t *extents, bool scaled)
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{
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if (unlikely (empty ()))
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{
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extents->width = 0;
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extents->x_bearing = 0;
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extents->height = 0;
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extents->y_bearing = 0;
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return;
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}
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{
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extents->x_bearing = roundf (min_x);
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extents->width = roundf (max_x - extents->x_bearing);
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extents->y_bearing = roundf (max_y);
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extents->height = roundf (min_y - extents->y_bearing);
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if (scaled)
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font->scale_glyph_extents (extents);
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}
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}
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protected:
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float min_x, min_y, max_x, max_y;
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} bounds;
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points_aggregator_t (hb_font_t *font_, hb_glyph_extents_t *extents_, contour_point_t *phantoms_, bool scaled_)
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{
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font = font_;
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extents = extents_;
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phantoms = phantoms_;
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scaled = scaled_;
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if (extents) bounds = contour_bounds_t ();
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}
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void consume_point (const contour_point_t &point) { bounds.add (point); }
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void points_end () { bounds.get_extents (font, extents, scaled); }
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bool is_consuming_contour_points () { return extents; }
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contour_point_t *get_phantoms_sink () { return phantoms; }
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};
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public:
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unsigned
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get_advance_with_var_unscaled (hb_font_t *font, hb_codepoint_t gid, bool is_vertical) const
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{
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if (unlikely (gid >= num_glyphs)) return 0;
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bool success = false;
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contour_point_t phantoms[glyf_impl::PHANTOM_COUNT];
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if (font->num_coords)
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success = get_points (font, gid, points_aggregator_t (font, nullptr, phantoms, false));
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if (unlikely (!success))
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return
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#ifndef HB_NO_VERTICAL
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is_vertical ? vmtx->get_advance_without_var_unscaled (gid) :
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#endif
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hmtx->get_advance_without_var_unscaled (gid);
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float result = is_vertical
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? phantoms[glyf_impl::PHANTOM_TOP].y - phantoms[glyf_impl::PHANTOM_BOTTOM].y
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: phantoms[glyf_impl::PHANTOM_RIGHT].x - phantoms[glyf_impl::PHANTOM_LEFT].x;
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return hb_clamp (roundf (result), 0.f, (float) UINT_MAX / 2);
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}
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bool get_leading_bearing_with_var_unscaled (hb_font_t *font, hb_codepoint_t gid, bool is_vertical, int *lsb) const
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{
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if (unlikely (gid >= num_glyphs)) return false;
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hb_glyph_extents_t extents;
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contour_point_t phantoms[glyf_impl::PHANTOM_COUNT];
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if (unlikely (!get_points (font, gid, points_aggregator_t (font, &extents, phantoms, false))))
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return false;
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*lsb = is_vertical
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? roundf (phantoms[glyf_impl::PHANTOM_TOP].y) - extents.y_bearing
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: roundf (phantoms[glyf_impl::PHANTOM_LEFT].x);
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return true;
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}
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#endif
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public:
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bool get_extents (hb_font_t *font, hb_codepoint_t gid, hb_glyph_extents_t *extents) const
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{
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if (unlikely (gid >= num_glyphs)) return false;
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#ifndef HB_NO_VAR
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if (font->num_coords)
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return get_points (font, gid, points_aggregator_t (font, extents, nullptr, true));
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#endif
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return glyph_for_gid (gid).get_extents_without_var_scaled (font, *this, extents);
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}
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bool paint_glyph (hb_font_t *font, hb_codepoint_t gid, hb_paint_funcs_t *funcs, void *data, hb_color_t foreground) const
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{
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funcs->push_clip_glyph (data, gid, font);
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funcs->color (data, true, foreground);
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funcs->pop_clip (data);
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return true;
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}
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const glyf_impl::Glyph
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glyph_for_gid (hb_codepoint_t gid, bool needs_padding_removal = false) const
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{
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if (unlikely (gid >= num_glyphs)) return glyf_impl::Glyph ();
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unsigned int start_offset, end_offset;
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if (short_offset)
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{
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const HBUINT16 *offsets = (const HBUINT16 *) loca_table->dataZ.arrayZ;
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start_offset = 2 * offsets[gid];
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end_offset = 2 * offsets[gid + 1];
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}
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else
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{
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const HBUINT32 *offsets = (const HBUINT32 *) loca_table->dataZ.arrayZ;
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start_offset = offsets[gid];
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end_offset = offsets[gid + 1];
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}
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if (unlikely (start_offset > end_offset || end_offset > glyf_table.get_length ()))
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return glyf_impl::Glyph ();
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glyf_impl::Glyph glyph (hb_bytes_t ((const char *) this->glyf_table + start_offset,
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end_offset - start_offset), gid);
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return needs_padding_removal ? glyf_impl::Glyph (glyph.trim_padding (), gid) : glyph;
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}
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bool
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get_path (hb_font_t *font, hb_codepoint_t gid, hb_draw_session_t &draw_session) const
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{ return get_points (font, gid, glyf_impl::path_builder_t (font, draw_session)); }
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#ifndef HB_NO_VAR
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const gvar_accelerator_t *gvar;
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#endif
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const hmtx_accelerator_t *hmtx;
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#ifndef HB_NO_VERTICAL
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const vmtx_accelerator_t *vmtx;
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#endif
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private:
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bool short_offset;
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unsigned int num_glyphs;
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hb_blob_ptr_t<loca> loca_table;
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hb_blob_ptr_t<glyf> glyf_table;
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};
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inline bool
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glyf::_populate_subset_glyphs (const hb_subset_plan_t *plan,
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hb_font_t *font,
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hb_vector_t<glyf_impl::SubsetGlyph>& glyphs /* OUT */) const
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{
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OT::glyf_accelerator_t glyf (plan->source);
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unsigned num_glyphs = plan->num_output_glyphs ();
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if (!glyphs.resize (num_glyphs)) return false;
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unsigned idx = 0;
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for (auto p : plan->glyph_map->iter ())
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{
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unsigned new_gid = p.second;
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glyf_impl::SubsetGlyph& subset_glyph = glyphs.arrayZ[new_gid];
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subset_glyph.old_gid = p.first;
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if (unlikely (new_gid == 0 &&
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!(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)) &&
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!plan->normalized_coords)
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subset_glyph.source_glyph = glyf_impl::Glyph ();
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else
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{
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/* If plan has an accelerator, the preprocessing step already trimmed glyphs.
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* Don't trim them again! */
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subset_glyph.source_glyph = glyf.glyph_for_gid (subset_glyph.old_gid, !plan->accelerator);
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}
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if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
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subset_glyph.drop_hints_bytes ();
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else
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subset_glyph.dest_start = subset_glyph.source_glyph.get_bytes ();
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if (font)
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{
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if (unlikely (!subset_glyph.compile_bytes_with_deltas (plan, font, glyf)))
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{
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// when pinned at default, only bounds are updated, thus no need to free
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if (!plan->pinned_at_default && idx > 0)
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_free_compiled_subset_glyphs (glyphs, idx - 1);
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return false;
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}
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idx++;
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}
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}
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return true;
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}
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inline hb_font_t *
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glyf::_create_font_for_instancing (const hb_subset_plan_t *plan) const
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{
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hb_font_t *font = hb_font_create (plan->source);
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if (unlikely (font == hb_font_get_empty ())) return nullptr;
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hb_vector_t<hb_variation_t> vars;
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if (unlikely (!vars.alloc (plan->user_axes_location.get_population (), true)))
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{
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hb_font_destroy (font);
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return nullptr;
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}
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for (auto _ : plan->user_axes_location)
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{
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hb_variation_t var;
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var.tag = _.first;
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var.value = _.second;
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vars.push (var);
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}
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#ifndef HB_NO_VAR
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hb_font_set_variations (font, vars.arrayZ, plan->user_axes_location.get_population ());
|
||
#endif
|
||
return font;
|
||
}
|
||
|
||
|
||
} /* namespace OT */
|
||
|
||
|
||
#endif /* OT_GLYF_GLYF_HH */
|