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-rw-r--r--src/3rdparty/harfbuzz-ng/src/OT/glyf/glyf.hh504
1 files changed, 504 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/OT/glyf/glyf.hh b/src/3rdparty/harfbuzz-ng/src/OT/glyf/glyf.hh
new file mode 100644
index 0000000000..6300cf4be0
--- /dev/null
+++ b/src/3rdparty/harfbuzz-ng/src/OT/glyf/glyf.hh
@@ -0,0 +1,504 @@
+#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 "../../hb-paint.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;
+
+ static bool has_valid_glyf_format(const hb_face_t* face)
+ {
+ const OT::head &head = *face->table.head;
+ return head.indexToLocFormat <= 1 && head.glyphDataFormat <= 1;
+ }
+
+ 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 <typename Iterator>
+ 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 (auto &_ : it)
+ if (unlikely (!_.serialize (c, use_short_loca, plan)))
+ return false;
+
+ /* 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);
+
+ if (!has_valid_glyf_format (c->plan->source)) {
+ // glyf format is unknown don't attempt to subset it.
+ DEBUG_MSG (SUBSET, nullptr,
+ "unkown glyf format, dropping from subset.");
+ return_trace (false);
+ }
+
+ hb_font_t *font = nullptr;
+ if (c->plan->normalized_coords)
+ {
+ font = _create_font_for_instancing (c->plan);
+ if (unlikely (!font))
+ return_trace (false);
+ }
+
+ hb_vector_t<unsigned> padded_offsets;
+ if (unlikely (!padded_offsets.alloc (c->plan->new_to_old_gid_list.length, true)))
+ return_trace (false);
+
+ hb_vector_t<glyf_impl::SubsetGlyph> glyphs;
+ if (!_populate_subset_glyphs (c->plan, font, glyphs))
+ {
+ hb_font_destroy (font);
+ return_trace (false);
+ }
+
+ if (font)
+ hb_font_destroy (font);
+
+ unsigned max_offset = 0;
+ for (auto &g : glyphs)
+ {
+ unsigned size = g.padded_size ();
+ padded_offsets.push (size);
+ max_offset += size;
+ }
+
+ bool use_short_loca = false;
+ if (likely (!c->plan->force_long_loca))
+ use_short_loca = max_offset < 0x1FFFF;
+
+ if (!use_short_loca)
+ {
+ padded_offsets.resize (0);
+ for (auto &g : glyphs)
+ padded_offsets.push (g.length ());
+ }
+
+ auto *glyf_prime = c->serializer->start_embed <glyf> ();
+ bool result = glyf_prime->serialize (c->serializer, hb_iter (glyphs), use_short_loca, c->plan);
+ if (c->plan->normalized_coords && !c->plan->pinned_at_default)
+ _free_compiled_subset_glyphs (glyphs);
+
+ if (unlikely (!c->serializer->check_success (glyf_impl::_add_loca_and_head (c,
+ padded_offsets.iter (),
+ use_short_loca))))
+ return_trace (false);
+
+ return result;
+ }
+
+ bool
+ _populate_subset_glyphs (const hb_subset_plan_t *plan,
+ hb_font_t *font,
+ hb_vector_t<glyf_impl::SubsetGlyph>& glyphs /* OUT */) const;
+
+ hb_font_t *
+ _create_font_for_instancing (const hb_subset_plan_t *plan) const;
+
+ void _free_compiled_subset_glyphs (hb_vector_t<glyf_impl::SubsetGlyph> &glyphs) const
+ {
+ for (auto &g : glyphs)
+ g.free_compiled_bytes ();
+ }
+
+ protected:
+ UnsizedArrayOf<HBUINT8>
+ 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 (!glyf::has_valid_glyf_format (face))
+ /* 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<glyf> (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<typename T>
+ 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, nullptr, nullptr, nullptr, true, true, phantom_only)))
+ return false;
+
+ unsigned count = all_points.length;
+ assert (count >= glyf_impl::PHANTOM_COUNT);
+ count -= glyf_impl::PHANTOM_COUNT;
+
+ if (consumer.is_consuming_contour_points ())
+ {
+ for (auto &point : all_points.as_array ().sub_array (0, count))
+ consumer.consume_point (point);
+ 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.arrayZ[count + i];
+
+ return true;
+ }
+
+ public:
+
+#ifndef HB_NO_VAR
+ struct points_aggregator_t
+ {
+ hb_font_t *font;
+ hb_glyph_extents_t *extents;
+ contour_point_t *phantoms;
+ bool scaled;
+
+ 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, bool scaled)
+ {
+ if (unlikely (empty ()))
+ {
+ extents->width = 0;
+ extents->x_bearing = 0;
+ extents->height = 0;
+ extents->y_bearing = 0;
+ return;
+ }
+ {
+ extents->x_bearing = roundf (min_x);
+ extents->width = roundf (max_x - extents->x_bearing);
+ extents->y_bearing = roundf (max_y);
+ extents->height = roundf (min_y - extents->y_bearing);
+
+ if (scaled)
+ font->scale_glyph_extents (extents);
+ }
+ }
+
+ 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_, bool scaled_)
+ {
+ font = font_;
+ extents = extents_;
+ phantoms = phantoms_;
+ scaled = scaled_;
+ if (extents) bounds = contour_bounds_t ();
+ }
+
+ HB_ALWAYS_INLINE
+ void consume_point (const contour_point_t &point) { bounds.add (point); }
+ void points_end () { bounds.get_extents (font, extents, scaled); }
+
+ bool is_consuming_contour_points () { return extents; }
+ contour_point_t *get_phantoms_sink () { return phantoms; }
+ };
+
+ unsigned
+ get_advance_with_var_unscaled (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 (font->num_coords)
+ success = get_points (font, gid, points_aggregator_t (font, nullptr, phantoms, false));
+
+ if (unlikely (!success))
+ return
+#ifndef HB_NO_VERTICAL
+ is_vertical ? vmtx->get_advance_without_var_unscaled (gid) :
+#endif
+ hmtx->get_advance_without_var_unscaled (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);
+ }
+
+ bool get_leading_bearing_with_var_unscaled (hb_font_t *font, hb_codepoint_t gid, bool is_vertical, int *lsb) const
+ {
+ if (unlikely (gid >= num_glyphs)) return false;
+
+ 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, false))))
+ return false;
+
+ *lsb = is_vertical
+ ? roundf (phantoms[glyf_impl::PHANTOM_TOP].y) - extents.y_bearing
+ : roundf (phantoms[glyf_impl::PHANTOM_LEFT].x);
+ return true;
+ }
+#endif
+
+ bool get_leading_bearing_without_var_unscaled (hb_codepoint_t gid, bool is_vertical, int *lsb) const
+ {
+ if (unlikely (gid >= num_glyphs)) return false;
+ if (is_vertical) return false; // TODO Humm, what to do here?
+
+ *lsb = glyph_for_gid (gid).get_header ()->xMin;
+ return true;
+ }
+
+ 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, true));
+#endif
+ return glyph_for_gid (gid).get_extents_without_var_scaled (font, *this, extents);
+ }
+
+ bool paint_glyph (hb_font_t *font, hb_codepoint_t gid, hb_paint_funcs_t *funcs, void *data, hb_color_t foreground) const
+ {
+ funcs->push_clip_glyph (data, gid, font);
+ funcs->color (data, true, foreground);
+ funcs->pop_clip (data);
+
+ return true;
+ }
+
+ 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> loca_table;
+ hb_blob_ptr_t<glyf> glyf_table;
+};
+
+
+inline bool
+glyf::_populate_subset_glyphs (const hb_subset_plan_t *plan,
+ hb_font_t *font,
+ hb_vector_t<glyf_impl::SubsetGlyph>& glyphs /* OUT */) const
+{
+ OT::glyf_accelerator_t glyf (plan->source);
+ if (!glyphs.alloc (plan->new_to_old_gid_list.length, true)) return false;
+
+ for (const auto &pair : plan->new_to_old_gid_list)
+ {
+ hb_codepoint_t new_gid = pair.first;
+ hb_codepoint_t old_gid = pair.second;
+ glyf_impl::SubsetGlyph *p = glyphs.push ();
+ glyf_impl::SubsetGlyph& subset_glyph = *p;
+ subset_glyph.old_gid = old_gid;
+
+ if (unlikely (old_gid == 0 && new_gid == 0 &&
+ !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)) &&
+ !plan->normalized_coords)
+ subset_glyph.source_glyph = glyf_impl::Glyph ();
+ else
+ {
+ /* If plan has an accelerator, the preprocessing step already trimmed glyphs.
+ * Don't trim them again! */
+ subset_glyph.source_glyph = glyf.glyph_for_gid (subset_glyph.old_gid, !plan->accelerator);
+ }
+
+ if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
+ subset_glyph.drop_hints_bytes ();
+ else
+ subset_glyph.dest_start = subset_glyph.source_glyph.get_bytes ();
+
+ if (font)
+ {
+ if (unlikely (!subset_glyph.compile_bytes_with_deltas (plan, font, glyf)))
+ {
+ // when pinned at default, only bounds are updated, thus no need to free
+ if (!plan->pinned_at_default)
+ _free_compiled_subset_glyphs (glyphs);
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+inline hb_font_t *
+glyf::_create_font_for_instancing (const hb_subset_plan_t *plan) const
+{
+ hb_font_t *font = hb_font_create (plan->source);
+ if (unlikely (font == hb_font_get_empty ())) return nullptr;
+
+ hb_vector_t<hb_variation_t> vars;
+ if (unlikely (!vars.alloc (plan->user_axes_location.get_population (), true)))
+ {
+ hb_font_destroy (font);
+ return nullptr;
+ }
+
+ for (auto _ : plan->user_axes_location)
+ {
+ hb_variation_t var;
+ var.tag = _.first;
+ var.value = _.second.middle;
+ vars.push (var);
+ }
+
+#ifndef HB_NO_VAR
+ hb_font_set_variations (font, vars.arrayZ, plan->user_axes_location.get_population ());
+#endif
+ return font;
+}
+
+
+} /* namespace OT */
+
+
+#endif /* OT_GLYF_GLYF_HH */
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