1262 lines
38 KiB
C++
1262 lines
38 KiB
C++
/*
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* Copyright © 2015 Google, Inc.
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* Copyright © 2019 Adobe Inc.
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* Copyright © 2019 Ebrahim Byagowi
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod, Garret Rieger, Roderick Sheeter
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* Adobe Author(s): Michiharu Ariza
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*/
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#ifndef HB_OT_GLYF_TABLE_HH
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#define HB_OT_GLYF_TABLE_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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namespace OT {
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/*
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* loca -- Index to Location
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* https://docs.microsoft.com/en-us/typography/opentype/spec/loca
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*/
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#define HB_OT_TAG_loca HB_TAG('l','o','c','a')
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struct loca
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{
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friend struct glyf;
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static constexpr hb_tag_t tableTag = HB_OT_TAG_loca;
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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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return_trace (true);
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}
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protected:
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UnsizedArrayOf<HBUINT8>
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dataZ; /* Location 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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/*
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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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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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template<typename Iterator,
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hb_requires (hb_is_source_of (Iterator, unsigned int))>
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static bool
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_add_loca_and_head (hb_subset_plan_t * plan, Iterator padded_offsets)
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{
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unsigned max_offset =
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+ padded_offsets
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| hb_reduce (hb_add, 0)
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;
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unsigned num_offsets = padded_offsets.len () + 1;
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bool use_short_loca = max_offset < 0x1FFFF;
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unsigned entry_size = use_short_loca ? 2 : 4;
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char *loca_prime_data = (char *) calloc (entry_size, num_offsets);
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if (unlikely (!loca_prime_data)) return false;
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DEBUG_MSG (SUBSET, nullptr, "loca entry_size %d num_offsets %d "
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"max_offset %d size %d",
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entry_size, num_offsets, max_offset, entry_size * num_offsets);
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if (use_short_loca)
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_write_loca (padded_offsets, 1, hb_array ((HBUINT16 *) loca_prime_data, num_offsets));
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else
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_write_loca (padded_offsets, 0, hb_array ((HBUINT32 *) loca_prime_data, num_offsets));
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hb_blob_t *loca_blob = hb_blob_create (loca_prime_data,
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entry_size * num_offsets,
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HB_MEMORY_MODE_WRITABLE,
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loca_prime_data,
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free);
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bool result = plan->add_table (HB_OT_TAG_loca, loca_blob)
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&& _add_head_and_set_loca_version (plan, use_short_loca);
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hb_blob_destroy (loca_blob);
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return result;
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}
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template<typename IteratorIn, typename IteratorOut,
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hb_requires (hb_is_source_of (IteratorIn, unsigned int)),
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hb_requires (hb_is_sink_of (IteratorOut, unsigned))>
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static void
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_write_loca (IteratorIn it, unsigned right_shift, IteratorOut dest)
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{
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unsigned int offset = 0;
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dest << 0;
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+ it
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| hb_map ([=, &offset] (unsigned int padded_size)
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{
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offset += padded_size;
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DEBUG_MSG (SUBSET, nullptr, "loca entry offset %d", offset);
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return offset >> right_shift;
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})
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| hb_sink (dest)
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;
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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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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, 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<SubsetGlyph> glyphs;
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_populate_subset_glyphs (c->plan, &glyphs);
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glyf_prime->serialize (c->serializer, hb_iter (glyphs), c->plan);
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auto padded_offsets =
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+ hb_iter (glyphs)
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| hb_map (&SubsetGlyph::padded_size)
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;
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if (c->serializer->in_error ()) return_trace (false);
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return_trace (c->serializer->check_success (_add_loca_and_head (c->plan,
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padded_offsets)));
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}
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template <typename SubsetGlyph>
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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<SubsetGlyph> *glyphs /* OUT */) const
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{
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OT::glyf::accelerator_t glyf;
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glyf.init (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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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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subset_glyph.source_glyph = glyf.glyph_for_gid (subset_glyph.old_gid, true);
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if (plan->drop_hints) subset_glyph.drop_hints_bytes ();
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else 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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glyf.fini ();
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}
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static bool
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_add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca)
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{
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hb_blob_t *head_blob = hb_sanitize_context_t ().reference_table<head> (plan->source);
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hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob);
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hb_blob_destroy (head_blob);
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if (unlikely (!head_prime_blob))
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return false;
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head *head_prime = (head *) hb_blob_get_data_writable (head_prime_blob, nullptr);
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head_prime->indexToLocFormat = use_short_loca ? 0 : 1;
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bool success = plan->add_table (HB_OT_TAG_head, head_prime_blob);
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hb_blob_destroy (head_prime_blob);
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return success;
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}
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struct CompositeGlyphChain
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{
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protected:
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enum composite_glyph_flag_t
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{
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ARG_1_AND_2_ARE_WORDS = 0x0001,
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ARGS_ARE_XY_VALUES = 0x0002,
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ROUND_XY_TO_GRID = 0x0004,
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WE_HAVE_A_SCALE = 0x0008,
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MORE_COMPONENTS = 0x0020,
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WE_HAVE_AN_X_AND_Y_SCALE = 0x0040,
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WE_HAVE_A_TWO_BY_TWO = 0x0080,
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WE_HAVE_INSTRUCTIONS = 0x0100,
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USE_MY_METRICS = 0x0200,
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OVERLAP_COMPOUND = 0x0400,
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SCALED_COMPONENT_OFFSET = 0x0800,
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UNSCALED_COMPONENT_OFFSET = 0x1000
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};
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public:
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unsigned int get_size () const
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{
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unsigned int size = min_size;
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/* arg1 and 2 are int16 */
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if (flags & ARG_1_AND_2_ARE_WORDS) size += 4;
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/* arg1 and 2 are int8 */
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else size += 2;
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/* One x 16 bit (scale) */
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if (flags & WE_HAVE_A_SCALE) size += 2;
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/* Two x 16 bit (xscale, yscale) */
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else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) size += 4;
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/* Four x 16 bit (xscale, scale01, scale10, yscale) */
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else if (flags & WE_HAVE_A_TWO_BY_TWO) size += 8;
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return size;
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}
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void set_glyph_index (hb_codepoint_t new_gid) { glyphIndex = new_gid; }
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hb_codepoint_t get_glyph_index () const { return glyphIndex; }
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void drop_instructions_flag () { flags = (uint16_t) flags & ~WE_HAVE_INSTRUCTIONS; }
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bool has_instructions () const { return flags & WE_HAVE_INSTRUCTIONS; }
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bool has_more () const { return flags & MORE_COMPONENTS; }
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bool is_use_my_metrics () const { return flags & USE_MY_METRICS; }
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bool is_anchored () const { return !(flags & ARGS_ARE_XY_VALUES); }
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void get_anchor_points (unsigned int &point1, unsigned int &point2) const
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{
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const HBUINT8 *p = &StructAfter<const HBUINT8> (glyphIndex);
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if (flags & ARG_1_AND_2_ARE_WORDS)
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{
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point1 = ((const HBUINT16 *) p)[0];
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point2 = ((const HBUINT16 *) p)[1];
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}
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else
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{
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point1 = p[0];
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point2 = p[1];
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}
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}
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void transform_points (contour_point_vector_t &points) const
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{
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float matrix[4];
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contour_point_t trans;
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if (get_transformation (matrix, trans))
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{
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if (scaled_offsets ())
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{
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points.translate (trans);
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points.transform (matrix);
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}
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else
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{
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points.transform (matrix);
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points.translate (trans);
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}
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}
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}
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||
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protected:
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bool scaled_offsets () const
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{ return (flags & (SCALED_COMPONENT_OFFSET | UNSCALED_COMPONENT_OFFSET)) == SCALED_COMPONENT_OFFSET; }
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||
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bool get_transformation (float (&matrix)[4], contour_point_t &trans) const
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{
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matrix[0] = matrix[3] = 1.f;
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matrix[1] = matrix[2] = 0.f;
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int tx, ty;
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const HBINT8 *p = &StructAfter<const HBINT8> (glyphIndex);
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if (flags & ARG_1_AND_2_ARE_WORDS)
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{
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tx = *(const HBINT16 *) p;
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p += HBINT16::static_size;
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ty = *(const HBINT16 *) p;
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p += HBINT16::static_size;
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}
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else
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{
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tx = *p++;
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ty = *p++;
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}
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if (is_anchored ()) tx = ty = 0;
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trans.init ((float) tx, (float) ty);
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||
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{
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const F2DOT14 *points = (const F2DOT14 *) p;
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if (flags & WE_HAVE_A_SCALE)
|
||
{
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matrix[0] = matrix[3] = points[0].to_float ();
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return true;
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}
|
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else if (flags & WE_HAVE_AN_X_AND_Y_SCALE)
|
||
{
|
||
matrix[0] = points[0].to_float ();
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matrix[3] = points[1].to_float ();
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return true;
|
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}
|
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else if (flags & WE_HAVE_A_TWO_BY_TWO)
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{
|
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matrix[0] = points[0].to_float ();
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matrix[1] = points[1].to_float ();
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matrix[2] = points[2].to_float ();
|
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matrix[3] = points[3].to_float ();
|
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return true;
|
||
}
|
||
}
|
||
return tx || ty;
|
||
}
|
||
|
||
protected:
|
||
HBUINT16 flags;
|
||
HBGlyphID glyphIndex;
|
||
public:
|
||
DEFINE_SIZE_MIN (4);
|
||
};
|
||
|
||
struct composite_iter_t : hb_iter_with_fallback_t<composite_iter_t, const CompositeGlyphChain &>
|
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{
|
||
typedef const CompositeGlyphChain *__item_t__;
|
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composite_iter_t (hb_bytes_t glyph_, __item_t__ current_) :
|
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glyph (glyph_), current (current_)
|
||
{ if (!check_range (current)) current = nullptr; }
|
||
composite_iter_t () : glyph (hb_bytes_t ()), current (nullptr) {}
|
||
|
||
const CompositeGlyphChain &__item__ () const { return *current; }
|
||
bool __more__ () const { return current; }
|
||
void __next__ ()
|
||
{
|
||
if (!current->has_more ()) { current = nullptr; return; }
|
||
|
||
const CompositeGlyphChain *possible = &StructAfter<CompositeGlyphChain,
|
||
CompositeGlyphChain> (*current);
|
||
if (!check_range (possible)) { current = nullptr; return; }
|
||
current = possible;
|
||
}
|
||
bool operator != (const composite_iter_t& o) const
|
||
{ return glyph != o.glyph || current != o.current; }
|
||
|
||
bool check_range (const CompositeGlyphChain *composite) const
|
||
{
|
||
return glyph.check_range (composite, CompositeGlyphChain::min_size)
|
||
&& glyph.check_range (composite, composite->get_size ());
|
||
}
|
||
|
||
private:
|
||
hb_bytes_t glyph;
|
||
__item_t__ current;
|
||
};
|
||
|
||
enum phantom_point_index_t
|
||
{
|
||
PHANTOM_LEFT = 0,
|
||
PHANTOM_RIGHT = 1,
|
||
PHANTOM_TOP = 2,
|
||
PHANTOM_BOTTOM = 3,
|
||
PHANTOM_COUNT = 4
|
||
};
|
||
|
||
struct accelerator_t;
|
||
|
||
struct Glyph
|
||
{
|
||
enum simple_glyph_flag_t
|
||
{
|
||
FLAG_ON_CURVE = 0x01,
|
||
FLAG_X_SHORT = 0x02,
|
||
FLAG_Y_SHORT = 0x04,
|
||
FLAG_REPEAT = 0x08,
|
||
FLAG_X_SAME = 0x10,
|
||
FLAG_Y_SAME = 0x20,
|
||
FLAG_RESERVED1 = 0x40,
|
||
FLAG_RESERVED2 = 0x80
|
||
};
|
||
|
||
private:
|
||
struct GlyphHeader
|
||
{
|
||
bool has_data () const { return numberOfContours; }
|
||
|
||
bool get_extents (hb_font_t *font, const accelerator_t &glyf_accelerator,
|
||
hb_codepoint_t gid, hb_glyph_extents_t *extents) const
|
||
{
|
||
/* Undocumented rasterizer behavior: shift glyph to the left by (lsb - xMin), i.e., xMin = lsb */
|
||
/* extents->x_bearing = hb_min (glyph_header.xMin, glyph_header.xMax); */
|
||
extents->x_bearing = font->em_scale_x (glyf_accelerator.hmtx->get_side_bearing (gid));
|
||
extents->y_bearing = font->em_scale_y (hb_max (yMin, yMax));
|
||
extents->width = font->em_scale_x (hb_max (xMin, xMax) - hb_min (xMin, xMax));
|
||
extents->height = font->em_scale_y (hb_min (yMin, yMax) - hb_max (yMin, yMax));
|
||
|
||
return true;
|
||
}
|
||
|
||
HBINT16 numberOfContours;
|
||
/* If the number of contours is
|
||
* greater than or equal to zero,
|
||
* this is a simple glyph; if negative,
|
||
* this is a composite glyph. */
|
||
FWORD xMin; /* Minimum x for coordinate data. */
|
||
FWORD yMin; /* Minimum y for coordinate data. */
|
||
FWORD xMax; /* Maximum x for coordinate data. */
|
||
FWORD yMax; /* Maximum y for coordinate data. */
|
||
public:
|
||
DEFINE_SIZE_STATIC (10);
|
||
};
|
||
|
||
struct SimpleGlyph
|
||
{
|
||
const GlyphHeader &header;
|
||
hb_bytes_t bytes;
|
||
SimpleGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) :
|
||
header (header_), bytes (bytes_) {}
|
||
|
||
unsigned int instruction_len_offset () const
|
||
{ return GlyphHeader::static_size + 2 * header.numberOfContours; }
|
||
|
||
unsigned int length (unsigned int instruction_len) const
|
||
{ return instruction_len_offset () + 2 + instruction_len; }
|
||
|
||
unsigned int instructions_length () const
|
||
{
|
||
unsigned int instruction_length_offset = instruction_len_offset ();
|
||
if (unlikely (instruction_length_offset + 2 > bytes.length)) return 0;
|
||
|
||
const HBUINT16 &instructionLength = StructAtOffset<HBUINT16> (&bytes, instruction_length_offset);
|
||
/* Out of bounds of the current glyph */
|
||
if (unlikely (length (instructionLength) > bytes.length)) return 0;
|
||
return instructionLength;
|
||
}
|
||
|
||
const Glyph trim_padding () const
|
||
{
|
||
/* based on FontTools _g_l_y_f.py::trim */
|
||
const char *glyph = bytes.arrayZ;
|
||
const char *glyph_end = glyph + bytes.length;
|
||
/* simple glyph w/contours, possibly trimmable */
|
||
glyph += instruction_len_offset ();
|
||
|
||
if (unlikely (glyph + 2 >= glyph_end)) return Glyph ();
|
||
unsigned int num_coordinates = StructAtOffset<HBUINT16> (glyph - 2, 0) + 1;
|
||
unsigned int num_instructions = StructAtOffset<HBUINT16> (glyph, 0);
|
||
|
||
glyph += 2 + num_instructions;
|
||
|
||
unsigned int coord_bytes = 0;
|
||
unsigned int coords_with_flags = 0;
|
||
while (glyph < glyph_end)
|
||
{
|
||
uint8_t flag = *glyph;
|
||
glyph++;
|
||
|
||
unsigned int repeat = 1;
|
||
if (flag & FLAG_REPEAT)
|
||
{
|
||
if (unlikely (glyph >= glyph_end)) return Glyph ();
|
||
repeat = *glyph + 1;
|
||
glyph++;
|
||
}
|
||
|
||
unsigned int xBytes, yBytes;
|
||
xBytes = yBytes = 0;
|
||
if (flag & FLAG_X_SHORT) xBytes = 1;
|
||
else if ((flag & FLAG_X_SAME) == 0) xBytes = 2;
|
||
|
||
if (flag & FLAG_Y_SHORT) yBytes = 1;
|
||
else if ((flag & FLAG_Y_SAME) == 0) yBytes = 2;
|
||
|
||
coord_bytes += (xBytes + yBytes) * repeat;
|
||
coords_with_flags += repeat;
|
||
if (coords_with_flags >= num_coordinates) break;
|
||
}
|
||
|
||
if (unlikely (coords_with_flags != num_coordinates)) return Glyph ();
|
||
return Glyph (bytes.sub_array (0, bytes.length + coord_bytes - (glyph_end - glyph)));
|
||
}
|
||
|
||
/* zero instruction length */
|
||
void drop_hints ()
|
||
{
|
||
GlyphHeader &glyph_header = const_cast<GlyphHeader &> (header);
|
||
(HBUINT16 &) StructAtOffset<HBUINT16> (&glyph_header, instruction_len_offset ()) = 0;
|
||
}
|
||
|
||
void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
|
||
{
|
||
unsigned int instructions_len = instructions_length ();
|
||
unsigned int glyph_length = length (instructions_len);
|
||
dest_start = bytes.sub_array (0, glyph_length - instructions_len);
|
||
dest_end = bytes.sub_array (glyph_length, bytes.length - glyph_length);
|
||
}
|
||
|
||
static bool read_points (const HBUINT8 *&p /* IN/OUT */,
|
||
contour_point_vector_t &points_ /* IN/OUT */,
|
||
const hb_bytes_t &bytes,
|
||
void (* setter) (contour_point_t &_, float v),
|
||
const simple_glyph_flag_t short_flag,
|
||
const simple_glyph_flag_t same_flag)
|
||
{
|
||
float v = 0;
|
||
for (unsigned i = 0; i < points_.length; i++)
|
||
{
|
||
uint8_t flag = points_[i].flag;
|
||
if (flag & short_flag)
|
||
{
|
||
if (unlikely (!bytes.check_range (p))) return false;
|
||
if (flag & same_flag)
|
||
v += *p++;
|
||
else
|
||
v -= *p++;
|
||
}
|
||
else
|
||
{
|
||
if (!(flag & same_flag))
|
||
{
|
||
if (unlikely (!bytes.check_range ((const HBUINT16 *) p))) return false;
|
||
v += *(const HBINT16 *) p;
|
||
p += HBINT16::static_size;
|
||
}
|
||
}
|
||
setter (points_[i], v);
|
||
}
|
||
return true;
|
||
}
|
||
|
||
bool get_contour_points (contour_point_vector_t &points_ /* OUT */,
|
||
bool phantom_only = false) const
|
||
{
|
||
const HBUINT16 *endPtsOfContours = &StructAfter<HBUINT16> (header);
|
||
int num_contours = header.numberOfContours;
|
||
if (unlikely (!bytes.check_range (&endPtsOfContours[num_contours + 1]))) return false;
|
||
unsigned int num_points = endPtsOfContours[num_contours - 1] + 1;
|
||
|
||
points_.resize (num_points);
|
||
for (unsigned int i = 0; i < points_.length; i++) points_[i].init ();
|
||
if (phantom_only) return true;
|
||
|
||
for (int i = 0; i < num_contours; i++)
|
||
points_[endPtsOfContours[i]].is_end_point = true;
|
||
|
||
/* Skip instructions */
|
||
const HBUINT8 *p = &StructAtOffset<HBUINT8> (&endPtsOfContours[num_contours + 1],
|
||
endPtsOfContours[num_contours]);
|
||
|
||
/* Read flags */
|
||
for (unsigned int i = 0; i < num_points; i++)
|
||
{
|
||
if (unlikely (!bytes.check_range (p))) return false;
|
||
uint8_t flag = *p++;
|
||
points_[i].flag = flag;
|
||
if (flag & FLAG_REPEAT)
|
||
{
|
||
if (unlikely (!bytes.check_range (p))) return false;
|
||
unsigned int repeat_count = *p++;
|
||
while ((repeat_count-- > 0) && (++i < num_points))
|
||
points_[i].flag = flag;
|
||
}
|
||
}
|
||
|
||
/* Read x & y coordinates */
|
||
return read_points (p, points_, bytes, [] (contour_point_t &p, float v) { p.x = v; },
|
||
FLAG_X_SHORT, FLAG_X_SAME)
|
||
&& read_points (p, points_, bytes, [] (contour_point_t &p, float v) { p.y = v; },
|
||
FLAG_Y_SHORT, FLAG_Y_SAME);
|
||
}
|
||
};
|
||
|
||
struct CompositeGlyph
|
||
{
|
||
const GlyphHeader &header;
|
||
hb_bytes_t bytes;
|
||
CompositeGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) :
|
||
header (header_), bytes (bytes_) {}
|
||
|
||
composite_iter_t get_iterator () const
|
||
{ return composite_iter_t (bytes, &StructAfter<CompositeGlyphChain, GlyphHeader> (header)); }
|
||
|
||
unsigned int instructions_length (hb_bytes_t bytes) const
|
||
{
|
||
unsigned int start = bytes.length;
|
||
unsigned int end = bytes.length;
|
||
const CompositeGlyphChain *last = nullptr;
|
||
for (auto &item : get_iterator ())
|
||
last = &item;
|
||
if (unlikely (!last)) return 0;
|
||
|
||
if (last->has_instructions ())
|
||
start = (char *) last - &bytes + last->get_size ();
|
||
if (unlikely (start > end)) return 0;
|
||
return end - start;
|
||
}
|
||
|
||
/* Trimming for composites not implemented.
|
||
* If removing hints it falls out of that. */
|
||
const Glyph trim_padding () const { return Glyph (bytes); }
|
||
|
||
void drop_hints ()
|
||
{
|
||
for (const auto &_ : get_iterator ())
|
||
const_cast<CompositeGlyphChain &> (_).drop_instructions_flag ();
|
||
}
|
||
|
||
/* Chop instructions off the end */
|
||
void drop_hints_bytes (hb_bytes_t &dest_start) const
|
||
{ dest_start = bytes.sub_array (0, bytes.length - instructions_length (bytes)); }
|
||
};
|
||
|
||
enum glyph_type_t { EMPTY, SIMPLE, COMPOSITE };
|
||
|
||
public:
|
||
composite_iter_t get_composite_iterator () const
|
||
{
|
||
if (type != COMPOSITE) return composite_iter_t ();
|
||
return CompositeGlyph (*header, bytes).get_iterator ();
|
||
}
|
||
|
||
const Glyph trim_padding () const
|
||
{
|
||
switch (type) {
|
||
case COMPOSITE: return CompositeGlyph (*header, bytes).trim_padding ();
|
||
case SIMPLE: return SimpleGlyph (*header, bytes).trim_padding ();
|
||
default: return bytes;
|
||
}
|
||
}
|
||
|
||
void drop_hints ()
|
||
{
|
||
switch (type) {
|
||
case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints (); return;
|
||
case SIMPLE: SimpleGlyph (*header, bytes).drop_hints (); return;
|
||
default: return;
|
||
}
|
||
}
|
||
|
||
void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
|
||
{
|
||
switch (type) {
|
||
case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints_bytes (dest_start); return;
|
||
case SIMPLE: SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return;
|
||
default: return;
|
||
}
|
||
}
|
||
|
||
/* Note: Recursively calls itself.
|
||
* all_points includes phantom points
|
||
*/
|
||
bool get_points (hb_font_t *font, const accelerator_t &glyf_accelerator,
|
||
contour_point_vector_t &all_points /* OUT */,
|
||
bool phantom_only = false,
|
||
unsigned int depth = 0) const
|
||
{
|
||
if (unlikely (depth > HB_MAX_NESTING_LEVEL)) return false;
|
||
contour_point_vector_t points;
|
||
|
||
switch (type) {
|
||
case COMPOSITE:
|
||
{
|
||
/* pseudo component points for each component in composite glyph */
|
||
unsigned num_points = hb_len (CompositeGlyph (*header, bytes).get_iterator ());
|
||
if (unlikely (!points.resize (num_points))) return false;
|
||
for (unsigned i = 0; i < points.length; i++)
|
||
points[i].init ();
|
||
break;
|
||
}
|
||
case SIMPLE:
|
||
if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (points, phantom_only)))
|
||
return false;
|
||
break;
|
||
}
|
||
|
||
/* Init phantom points */
|
||
if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false;
|
||
hb_array_t<contour_point_t> phantoms = points.sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);
|
||
{
|
||
for (unsigned i = 0; i < PHANTOM_COUNT; ++i) phantoms[i].init ();
|
||
int h_delta = (int) header->xMin - glyf_accelerator.hmtx->get_side_bearing (gid);
|
||
int v_orig = (int) header->yMax + glyf_accelerator.vmtx->get_side_bearing (gid);
|
||
unsigned h_adv = glyf_accelerator.hmtx->get_advance (gid);
|
||
unsigned v_adv = glyf_accelerator.vmtx->get_advance (gid);
|
||
phantoms[PHANTOM_LEFT].x = h_delta;
|
||
phantoms[PHANTOM_RIGHT].x = h_adv + h_delta;
|
||
phantoms[PHANTOM_TOP].y = v_orig;
|
||
phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv;
|
||
}
|
||
|
||
#ifndef HB_NO_VAR
|
||
if (unlikely (!glyf_accelerator.gvar->apply_deltas_to_points (gid, font, points.as_array ())))
|
||
return false;
|
||
#endif
|
||
|
||
switch (type) {
|
||
case SIMPLE:
|
||
all_points.extend (points.as_array ());
|
||
break;
|
||
case COMPOSITE:
|
||
{
|
||
unsigned int comp_index = 0;
|
||
for (auto &item : get_composite_iterator ())
|
||
{
|
||
contour_point_vector_t comp_points;
|
||
if (unlikely (!glyf_accelerator.glyph_for_gid (item.get_glyph_index ())
|
||
.get_points (font, glyf_accelerator, comp_points,
|
||
phantom_only, depth + 1)
|
||
|| comp_points.length < PHANTOM_COUNT))
|
||
return false;
|
||
|
||
/* Copy phantom points from component if USE_MY_METRICS flag set */
|
||
if (item.is_use_my_metrics ())
|
||
for (unsigned int i = 0; i < PHANTOM_COUNT; i++)
|
||
phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i];
|
||
|
||
/* Apply component transformation & translation */
|
||
item.transform_points (comp_points);
|
||
|
||
/* Apply translation from gvar */
|
||
comp_points.translate (points[comp_index]);
|
||
|
||
if (item.is_anchored ())
|
||
{
|
||
unsigned int p1, p2;
|
||
item.get_anchor_points (p1, p2);
|
||
if (likely (p1 < all_points.length && p2 < comp_points.length))
|
||
{
|
||
contour_point_t delta;
|
||
delta.init (all_points[p1].x - comp_points[p2].x,
|
||
all_points[p1].y - comp_points[p2].y);
|
||
|
||
comp_points.translate (delta);
|
||
}
|
||
}
|
||
|
||
all_points.extend (comp_points.sub_array (0, comp_points.length - PHANTOM_COUNT));
|
||
|
||
comp_index++;
|
||
}
|
||
|
||
all_points.extend (phantoms);
|
||
} break;
|
||
default:
|
||
all_points.extend (phantoms);
|
||
}
|
||
|
||
if (depth == 0) /* Apply at top level */
|
||
{
|
||
/* Undocumented rasterizer behavior:
|
||
* Shift points horizontally by the updated left side bearing
|
||
*/
|
||
contour_point_t delta;
|
||
delta.init (-phantoms[PHANTOM_LEFT].x, 0.f);
|
||
if (delta.x) all_points.translate (delta);
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
bool get_extents (hb_font_t *font, const accelerator_t &glyf_accelerator,
|
||
hb_glyph_extents_t *extents) const
|
||
{
|
||
if (type == EMPTY) return true; /* Empty glyph; zero extents. */
|
||
return header->get_extents (font, glyf_accelerator, gid, extents);
|
||
}
|
||
|
||
hb_bytes_t get_bytes () const { return bytes; }
|
||
|
||
Glyph (hb_bytes_t bytes_ = hb_bytes_t (),
|
||
hb_codepoint_t gid_ = (hb_codepoint_t) -1) : bytes (bytes_), gid (gid_),
|
||
header (bytes.as<GlyphHeader> ())
|
||
{
|
||
int num_contours = header->numberOfContours;
|
||
if (unlikely (num_contours == 0)) type = EMPTY;
|
||
else if (num_contours > 0) type = SIMPLE;
|
||
else type = COMPOSITE; /* negative numbers */
|
||
}
|
||
|
||
protected:
|
||
hb_bytes_t bytes;
|
||
hb_codepoint_t gid;
|
||
const GlyphHeader *header;
|
||
unsigned type;
|
||
};
|
||
|
||
struct accelerator_t
|
||
{
|
||
void init (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;
|
||
vmtx = nullptr;
|
||
face = face_;
|
||
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 = hb_sanitize_context_t ().reference_table<loca> (face);
|
||
glyf_table = hb_sanitize_context_t ().reference_table<glyf> (face);
|
||
#ifndef HB_NO_VAR
|
||
gvar = face->table.gvar;
|
||
#endif
|
||
hmtx = face->table.hmtx;
|
||
vmtx = face->table.vmtx;
|
||
|
||
num_glyphs = hb_max (1u, loca_table.get_length () / (short_offset ? 2 : 4)) - 1;
|
||
num_glyphs = hb_min (num_glyphs, face->get_num_glyphs ());
|
||
}
|
||
|
||
void fini ()
|
||
{
|
||
loca_table.destroy ();
|
||
glyf_table.destroy ();
|
||
}
|
||
|
||
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 alloc free 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 ())
|
||
{
|
||
for (unsigned point_index = 0; point_index + 4 < all_points.length; ++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 < PHANTOM_COUNT; ++i)
|
||
phantoms[i] = all_points[all_points.length - 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 - min_x);
|
||
extents->y_bearing = font->em_scalef_y (max_y);
|
||
extents->height = font->em_scalef_y (min_y - max_y);
|
||
}
|
||
|
||
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[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 is_vertical ? vmtx->get_advance (gid) : hmtx->get_advance (gid);
|
||
|
||
float result = is_vertical
|
||
? phantoms[PHANTOM_TOP].y - phantoms[PHANTOM_BOTTOM].y
|
||
: phantoms[PHANTOM_RIGHT].x - phantoms[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[PHANTOM_COUNT];
|
||
if (unlikely (!get_points (font, gid, points_aggregator_t (font, &extents, phantoms))))
|
||
return is_vertical ? vmtx->get_side_bearing (gid) : hmtx->get_side_bearing (gid);
|
||
|
||
return is_vertical
|
||
? ceilf (phantoms[PHANTOM_TOP].y) - extents.y_bearing
|
||
: floorf (phantoms[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 && font->num_coords == gvar->get_axis_count ())
|
||
return get_points (font, gid, points_aggregator_t (font, extents, nullptr));
|
||
#endif
|
||
return glyph_for_gid (gid).get_extents (font, *this, extents);
|
||
}
|
||
|
||
const Glyph
|
||
glyph_for_gid (hb_codepoint_t gid, bool needs_padding_removal = false) const
|
||
{
|
||
if (unlikely (gid >= num_glyphs)) return 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 Glyph ();
|
||
|
||
Glyph glyph (hb_bytes_t ((const char *) this->glyf_table + start_offset,
|
||
end_offset - start_offset), gid);
|
||
return needs_padding_removal ? glyph.trim_padding () : glyph;
|
||
}
|
||
|
||
void
|
||
add_gid_and_children (hb_codepoint_t gid, hb_set_t *gids_to_retain,
|
||
unsigned int depth = 0) const
|
||
{
|
||
if (unlikely (depth++ > HB_MAX_NESTING_LEVEL)) return;
|
||
/* Check if is already visited */
|
||
if (gids_to_retain->has (gid)) return;
|
||
|
||
gids_to_retain->add (gid);
|
||
|
||
for (auto &item : glyph_for_gid (gid).get_composite_iterator ())
|
||
add_gid_and_children (item.get_glyph_index (), gids_to_retain, depth);
|
||
}
|
||
|
||
#ifdef HB_EXPERIMENTAL_API
|
||
struct path_builder_t
|
||
{
|
||
hb_font_t *font;
|
||
draw_helper_t *draw_helper;
|
||
|
||
struct optional_point_t
|
||
{
|
||
optional_point_t () { has_data = false; }
|
||
optional_point_t (float x_, float y_) { x = x_; y = y_; has_data = true; }
|
||
|
||
bool has_data;
|
||
float x;
|
||
float y;
|
||
|
||
optional_point_t lerp (optional_point_t p, float t)
|
||
{ return optional_point_t (x + t * (p.x - x), y + t * (p.y - y)); }
|
||
} first_oncurve, first_offcurve, last_offcurve;
|
||
|
||
path_builder_t (hb_font_t *font_, draw_helper_t &draw_helper_)
|
||
{
|
||
font = font_;
|
||
draw_helper = &draw_helper_;
|
||
first_oncurve = first_offcurve = last_offcurve = optional_point_t ();
|
||
}
|
||
|
||
/* based on https://github.com/RazrFalcon/ttf-parser/blob/4f32821/src/glyf.rs#L287
|
||
See also:
|
||
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM01/Chap1.html
|
||
* https://stackoverflow.com/a/20772557 */
|
||
void consume_point (const contour_point_t &point)
|
||
{
|
||
/* Skip empty contours */
|
||
if (unlikely (point.is_end_point && !first_oncurve.has_data && !first_offcurve.has_data))
|
||
return;
|
||
|
||
bool is_on_curve = point.flag & Glyph::FLAG_ON_CURVE;
|
||
optional_point_t p (point.x, point.y);
|
||
if (!first_oncurve.has_data)
|
||
{
|
||
if (is_on_curve)
|
||
{
|
||
first_oncurve = p;
|
||
draw_helper->move_to (font->em_scalef_x (p.x), font->em_scalef_y (p.y));
|
||
}
|
||
else
|
||
{
|
||
if (first_offcurve.has_data)
|
||
{
|
||
optional_point_t mid = first_offcurve.lerp (p, .5f);
|
||
first_oncurve = mid;
|
||
last_offcurve = p;
|
||
draw_helper->move_to (font->em_scalef_x (mid.x), font->em_scalef_y (mid.y));
|
||
}
|
||
else
|
||
first_offcurve = p;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (last_offcurve.has_data)
|
||
{
|
||
if (is_on_curve)
|
||
{
|
||
draw_helper->quadratic_to (font->em_scalef_x (last_offcurve.x), font->em_scalef_y (last_offcurve.y),
|
||
font->em_scalef_x (p.x), font->em_scalef_y (p.y));
|
||
last_offcurve = optional_point_t ();
|
||
}
|
||
else
|
||
{
|
||
optional_point_t mid = last_offcurve.lerp (p, .5f);
|
||
draw_helper->quadratic_to (font->em_scalef_x (last_offcurve.x), font->em_scalef_y (last_offcurve.y),
|
||
font->em_scalef_x (mid.x), font->em_scalef_y (mid.y));
|
||
last_offcurve = p;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (is_on_curve)
|
||
draw_helper->line_to (font->em_scalef_x (p.x), font->em_scalef_y (p.y));
|
||
else
|
||
last_offcurve = p;
|
||
}
|
||
}
|
||
|
||
if (point.is_end_point)
|
||
{
|
||
if (first_offcurve.has_data && last_offcurve.has_data)
|
||
{
|
||
optional_point_t mid = last_offcurve.lerp (first_offcurve, .5f);
|
||
draw_helper->quadratic_to (font->em_scalef_x (last_offcurve.x), font->em_scalef_y (last_offcurve.y),
|
||
font->em_scalef_x (mid.x), font->em_scalef_y (mid.y));
|
||
last_offcurve = optional_point_t ();
|
||
/* now check the rest */
|
||
}
|
||
|
||
if (first_offcurve.has_data && first_oncurve.has_data)
|
||
draw_helper->quadratic_to (font->em_scalef_x (first_offcurve.x), font->em_scalef_y (first_offcurve.y),
|
||
font->em_scalef_x (first_oncurve.x), font->em_scalef_y (first_oncurve.y));
|
||
else if (last_offcurve.has_data && first_oncurve.has_data)
|
||
draw_helper->quadratic_to (font->em_scalef_x (last_offcurve.x), font->em_scalef_y (last_offcurve.y),
|
||
font->em_scalef_x (first_oncurve.x), font->em_scalef_y (first_oncurve.y));
|
||
else if (first_oncurve.has_data)
|
||
draw_helper->line_to (font->em_scalef_x (first_oncurve.x), font->em_scalef_y (first_oncurve.y));
|
||
|
||
/* Getting ready for the next contour */
|
||
first_oncurve = first_offcurve = last_offcurve = optional_point_t ();
|
||
draw_helper->end_path ();
|
||
}
|
||
}
|
||
void points_end () {}
|
||
|
||
bool is_consuming_contour_points () { return true; }
|
||
contour_point_t *get_phantoms_sink () { return nullptr; }
|
||
};
|
||
|
||
bool
|
||
get_path (hb_font_t *font, hb_codepoint_t gid, draw_helper_t &draw_helper) const
|
||
{ return get_points (font, gid, path_builder_t (font, draw_helper)); }
|
||
#endif
|
||
|
||
#ifndef HB_NO_VAR
|
||
const gvar_accelerator_t *gvar;
|
||
#endif
|
||
const hmtx_accelerator_t *hmtx;
|
||
const vmtx_accelerator_t *vmtx;
|
||
|
||
private:
|
||
bool short_offset;
|
||
unsigned int num_glyphs;
|
||
hb_blob_ptr_t<loca> loca_table;
|
||
hb_blob_ptr_t<glyf> glyf_table;
|
||
hb_face_t *face;
|
||
};
|
||
|
||
struct SubsetGlyph
|
||
{
|
||
hb_codepoint_t new_gid;
|
||
hb_codepoint_t old_gid;
|
||
Glyph source_glyph;
|
||
hb_bytes_t dest_start; /* region of source_glyph to copy first */
|
||
hb_bytes_t dest_end; /* region of source_glyph to copy second */
|
||
|
||
bool serialize (hb_serialize_context_t *c,
|
||
const hb_subset_plan_t *plan) const
|
||
{
|
||
TRACE_SERIALIZE (this);
|
||
|
||
hb_bytes_t dest_glyph = dest_start.copy (c);
|
||
dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + dest_end.copy (c).length);
|
||
unsigned int pad_length = padding ();
|
||
DEBUG_MSG (SUBSET, nullptr, "serialize %d byte glyph, width %d pad %d", dest_glyph.length, dest_glyph.length + pad_length, pad_length);
|
||
|
||
HBUINT8 pad;
|
||
pad = 0;
|
||
while (pad_length > 0)
|
||
{
|
||
c->embed (pad);
|
||
pad_length--;
|
||
}
|
||
|
||
if (unlikely (!dest_glyph.length)) return_trace (true);
|
||
|
||
/* update components gids */
|
||
for (auto &_ : Glyph (dest_glyph).get_composite_iterator ())
|
||
{
|
||
hb_codepoint_t new_gid;
|
||
if (plan->new_gid_for_old_gid (_.get_glyph_index (), &new_gid))
|
||
const_cast<CompositeGlyphChain &> (_).set_glyph_index (new_gid);
|
||
}
|
||
|
||
if (plan->drop_hints) Glyph (dest_glyph).drop_hints ();
|
||
|
||
return_trace (true);
|
||
}
|
||
|
||
void drop_hints_bytes ()
|
||
{ source_glyph.drop_hints_bytes (dest_start, dest_end); }
|
||
|
||
unsigned int length () const { return dest_start.length + dest_end.length; }
|
||
/* pad to 2 to ensure 2-byte loca will be ok */
|
||
unsigned int padding () const { return length () % 2; }
|
||
unsigned int padded_size () const { return length () + padding (); }
|
||
};
|
||
|
||
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 {};
|
||
|
||
} /* namespace OT */
|
||
|
||
|
||
#endif /* HB_OT_GLYF_TABLE_HH */
|