139 lines
3.6 KiB
C++
139 lines
3.6 KiB
C++
#ifndef OT_GLYF_SUBSETGLYPH_HH
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#define OT_GLYF_SUBSETGLYPH_HH
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#include "../../hb-open-type.hh"
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namespace OT {
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struct glyf_accelerator_t;
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namespace glyf_impl {
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struct SubsetGlyph
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{
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hb_codepoint_t old_gid;
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Glyph source_glyph;
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hb_bytes_t dest_start; /* region of source_glyph to copy first */
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hb_bytes_t dest_end; /* region of source_glyph to copy second */
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bool allocated;
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bool serialize (hb_serialize_context_t *c,
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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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hb_bytes_t dest_glyph = dest_start.copy (c);
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hb_bytes_t end_copy = dest_end.copy (c);
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if (!end_copy.arrayZ || !dest_glyph.arrayZ) {
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return false;
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}
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dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + end_copy.length);
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unsigned int pad_length = use_short_loca ? padding () : 0;
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DEBUG_MSG (SUBSET, nullptr, "serialize %u byte glyph, width %u pad %u", dest_glyph.length, dest_glyph.length + pad_length, pad_length);
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HBUINT8 pad;
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pad = 0;
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while (pad_length > 0)
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{
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c->embed (pad);
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pad_length--;
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}
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if (unlikely (!dest_glyph.length)) return_trace (true);
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/* update components gids */
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for (auto &_ : Glyph (dest_glyph).get_composite_iterator ())
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{
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hb_codepoint_t new_gid;
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if (plan->new_gid_for_old_gid (_.get_gid(), &new_gid))
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const_cast<CompositeGlyphRecord &> (_).set_gid (new_gid);
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}
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#ifndef HB_NO_BEYOND_64K
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auto _ = Glyph (dest_glyph).get_composite_iterator ();
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if (_)
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{
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/* lower GID24 to GID16 in components if possible. */
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char *p = _ ? (char *) &*_ : nullptr;
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char *q = p;
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const char *end = dest_glyph.arrayZ + dest_glyph.length;
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while (_)
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{
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auto &rec = const_cast<CompositeGlyphRecord &> (*_);
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++_;
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q += rec.get_size ();
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rec.lower_gid_24_to_16 ();
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unsigned size = rec.get_size ();
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memmove (p, &rec, size);
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p += size;
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}
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memmove (p, q, end - q);
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p += end - q;
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/* We want to shorten the glyph, but we can't do that without
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* updating the length in the loca table, which is already
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* written out :-(. So we just fill the rest of the glyph with
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* harmless instructions, since that's what they will be
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* interpreted as. */
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hb_memset (p, 0x7A /* TrueType instruction ROFF; harmless */, end - p);
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p += end - p;
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dest_glyph = hb_bytes_t (dest_glyph.arrayZ, p - (char *) dest_glyph.arrayZ);
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// TODO: Padding; & trim serialized bytes.
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// TODO: Update length in loca. Ugh.
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}
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#endif
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if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
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Glyph (dest_glyph).drop_hints ();
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if (plan->flags & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG)
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Glyph (dest_glyph).set_overlaps_flag ();
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return_trace (true);
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}
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bool compile_bytes_with_deltas (const hb_subset_plan_t *plan,
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hb_font_t *font,
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const glyf_accelerator_t &glyf)
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{
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allocated = source_glyph.compile_bytes_with_deltas (plan, font, glyf, dest_start, dest_end);
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return allocated;
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}
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void free_compiled_bytes ()
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{
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if (likely (allocated)) {
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allocated = false;
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dest_start.fini ();
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dest_end.fini ();
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}
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}
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void drop_hints_bytes ()
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{ source_glyph.drop_hints_bytes (dest_start, dest_end); }
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unsigned int length () const { return dest_start.length + dest_end.length; }
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/* pad to 2 to ensure 2-byte loca will be ok */
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unsigned int padding () const { return length () % 2; }
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unsigned int padded_size () const { return length () + padding (); }
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};
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} /* namespace glyf_impl */
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} /* namespace OT */
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#endif /* OT_GLYF_SUBSETGLYPH_HH */
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