125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
#ifndef OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH
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#define OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH
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#include "Common.hh"
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namespace OT {
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namespace Layout {
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namespace GSUB {
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struct SingleSubstFormat1
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{
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protected:
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HBUINT16 format; /* Format identifier--format = 1 */
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Offset16To<Coverage>
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coverage; /* Offset to Coverage table--from
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* beginning of Substitution table */
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HBUINT16 deltaGlyphID; /* Add to original GlyphID to get
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* substitute GlyphID, modulo 0x10000 */
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public:
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DEFINE_SIZE_STATIC (6);
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (coverage.sanitize (c, this) && deltaGlyphID.sanitize (c));
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}
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inline bool is_inplace () const { return true; }
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bool intersects (const hb_set_t *glyphs) const
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{ return (this+coverage).intersects (glyphs); }
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bool may_have_non_1to1 () const
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{ return false; }
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void closure (hb_closure_context_t *c) const
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{
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unsigned d = deltaGlyphID;
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+ hb_iter (this+coverage)
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| hb_filter (c->parent_active_glyphs ())
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| hb_map ([d] (hb_codepoint_t g) { return (g + d) & 0xFFFFu; })
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| hb_sink (c->output)
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;
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}
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void closure_lookups (hb_closure_lookups_context_t *c) const {}
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void collect_glyphs (hb_collect_glyphs_context_t *c) const
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{
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if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
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unsigned d = deltaGlyphID;
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+ hb_iter (this+coverage)
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| hb_map ([d] (hb_codepoint_t g) { return (g + d) & 0xFFFFu; })
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| hb_sink (c->output)
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;
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}
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const Coverage &get_coverage () const { return this+coverage; }
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bool would_apply (hb_would_apply_context_t *c) const
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{ return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; }
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bool apply (hb_ot_apply_context_t *c) const
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{
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TRACE_APPLY (this);
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hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
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unsigned int index = (this+coverage).get_coverage (glyph_id);
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if (likely (index == NOT_COVERED)) return_trace (false);
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/* According to the Adobe Annotated OpenType Suite, result is always
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* limited to 16bit. */
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glyph_id = (glyph_id + deltaGlyphID) & 0xFFFFu;
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c->replace_glyph (glyph_id);
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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_sorted_source_of (Iterator, hb_codepoint_t))>
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bool serialize (hb_serialize_context_t *c,
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Iterator glyphs,
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unsigned delta)
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{
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TRACE_SERIALIZE (this);
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if (unlikely (!c->extend_min (this))) return_trace (false);
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if (unlikely (!coverage.serialize_serialize (c, glyphs))) return_trace (false);
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c->check_assign (deltaGlyphID, delta, HB_SERIALIZE_ERROR_INT_OVERFLOW);
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return_trace (true);
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}
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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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const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
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const hb_map_t &glyph_map = *c->plan->glyph_map;
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hb_codepoint_t delta = deltaGlyphID;
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auto it =
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+ hb_iter (this+coverage)
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| hb_filter (glyphset)
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| hb_map_retains_sorting ([&] (hb_codepoint_t g) {
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return hb_codepoint_pair_t (g,
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(g + delta) & 0xFFFF); })
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| hb_filter (glyphset, hb_second)
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| hb_map_retains_sorting ([&] (hb_codepoint_pair_t p) -> hb_codepoint_pair_t
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{ return hb_pair (glyph_map[p.first], glyph_map[p.second]); })
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;
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bool ret = bool (it);
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SingleSubst_serialize (c->serializer, it);
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return_trace (ret);
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}
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};
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}
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}
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}
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#endif /* OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH */
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