386 lines
11 KiB
C++
386 lines
11 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 "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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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 (const auto &_ : it) _.serialize (c, use_short_loca, plan);
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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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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_vector_t<glyf_impl::SubsetGlyph> glyphs;
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_populate_subset_glyphs (c->plan, &glyphs);
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auto padded_offsets =
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+ hb_iter (glyphs)
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| hb_map (&glyf_impl::SubsetGlyph::padded_size)
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;
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unsigned max_offset = + padded_offsets | hb_reduce (hb_add, 0);
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bool use_short_loca = max_offset < 0x1FFFF;
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glyf_prime->serialize (c->serializer, hb_iter (glyphs), use_short_loca, c->plan);
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if (!use_short_loca) {
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padded_offsets =
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+ hb_iter (glyphs)
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| hb_map (&glyf_impl::SubsetGlyph::length)
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;
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}
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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,
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use_short_loca)));
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}
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void
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_populate_subset_glyphs (const hb_subset_plan_t *plan,
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hb_vector_t<glyf_impl::SubsetGlyph> *glyphs /* OUT */) const;
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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 (head.indexToLocFormat > 1 || head.glyphDataFormat > 0)
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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, 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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for (unsigned point_index = 0; point_index + 4 < all_points.length; ++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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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)
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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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extents->x_bearing = font->em_scalef_x (min_x);
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extents->width = font->em_scalef_x (max_x) - extents->x_bearing;
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extents->y_bearing = font->em_scalef_y (max_y);
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extents->height = font->em_scalef_y (min_y) - extents->y_bearing;
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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_)
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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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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); }
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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_var (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 (likely (font->num_coords == gvar->get_axis_count ()))
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success = get_points (font, gid, points_aggregator_t (font, nullptr, phantoms));
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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 (gid) :
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#endif
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hmtx->get_advance (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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int get_side_bearing_var (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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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))))
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return
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#ifndef HB_NO_VERTICAL
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is_vertical ? vmtx->get_side_bearing (gid) :
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#endif
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hmtx->get_side_bearing (gid);
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return is_vertical
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? ceilf (phantoms[glyf_impl::PHANTOM_TOP].y) - extents.y_bearing
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: floorf (phantoms[glyf_impl::PHANTOM_LEFT].x);
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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 && font->num_coords == gvar->get_axis_count ())
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return get_points (font, gid, points_aggregator_t (font, extents, nullptr));
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#endif
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return glyph_for_gid (gid).get_extents (font, *this, extents);
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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 ()) : 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 void
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glyf::_populate_subset_glyphs (const hb_subset_plan_t *plan,
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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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+ hb_range (plan->num_output_glyphs ())
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| hb_map ([&] (hb_codepoint_t new_gid)
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{
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glyf_impl::SubsetGlyph subset_glyph = {0};
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subset_glyph.new_gid = new_gid;
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/* should never fail: all old gids should be mapped */
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if (!plan->old_gid_for_new_gid (new_gid, &subset_glyph.old_gid))
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return subset_glyph;
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if (new_gid == 0 &&
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!(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE))
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subset_glyph.source_glyph = glyf_impl::Glyph ();
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else
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subset_glyph.source_glyph = glyf.glyph_for_gid (subset_glyph.old_gid, true);
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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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return subset_glyph;
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})
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| hb_sink (glyphs)
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;
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}
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} /* namespace OT */
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#endif /* OT_GLYF_GLYF_HH */
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