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-rw-r--r--gfx/harfbuzz/src/OT/Layout/GSUB/SingleSubstFormat1.hh204
1 files changed, 204 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/OT/Layout/GSUB/SingleSubstFormat1.hh b/gfx/harfbuzz/src/OT/Layout/GSUB/SingleSubstFormat1.hh
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+++ b/gfx/harfbuzz/src/OT/Layout/GSUB/SingleSubstFormat1.hh
@@ -0,0 +1,204 @@
+#ifndef OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH
+#define OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH
+
+#include "Common.hh"
+
+namespace OT {
+namespace Layout {
+namespace GSUB_impl {
+
+template <typename Types>
+struct SingleSubstFormat1_3
+{
+ protected:
+ HBUINT16 format; /* Format identifier--format = 1 */
+ typename Types::template OffsetTo<Coverage>
+ coverage; /* Offset to Coverage table--from
+ * beginning of Substitution table */
+ typename Types::HBUINT
+ deltaGlyphID; /* Add to original GlyphID to get
+ * substitute GlyphID, modulo 0x10000 */
+
+ public:
+ DEFINE_SIZE_STATIC (2 + 2 * Types::size);
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ coverage.sanitize (c, this) &&
+ /* The coverage table may use a range to represent a set
+ * of glyphs, which means a small number of bytes can
+ * generate a large glyph set. Manually modify the
+ * sanitizer max ops to take this into account.
+ *
+ * Note: This check *must* be right after coverage sanitize. */
+ c->check_ops ((this + coverage).get_population () >> 1));
+ }
+
+ hb_codepoint_t get_mask () const
+ { return (1 << (8 * Types::size)) - 1; }
+
+ bool intersects (const hb_set_t *glyphs) const
+ { return (this+coverage).intersects (glyphs); }
+
+ bool may_have_non_1to1 () const
+ { return false; }
+
+ void closure (hb_closure_context_t *c) const
+ {
+ hb_codepoint_t d = deltaGlyphID;
+ hb_codepoint_t mask = get_mask ();
+
+ /* Help fuzzer avoid this function as much. */
+ unsigned pop = (this+coverage).get_population ();
+ if (pop >= mask)
+ return;
+
+ hb_set_t intersection;
+ (this+coverage).intersect_set (c->parent_active_glyphs (), intersection);
+
+ /* In degenerate fuzzer-found fonts, but not real fonts,
+ * this table can keep adding new glyphs in each round of closure.
+ * Refuse to close-over, if it maps glyph range to overlapping range. */
+ hb_codepoint_t min_before = intersection.get_min ();
+ hb_codepoint_t max_before = intersection.get_max ();
+ hb_codepoint_t min_after = (min_before + d) & mask;
+ hb_codepoint_t max_after = (max_before + d) & mask;
+ if (intersection.get_population () == max_before - min_before + 1 &&
+ ((min_before <= min_after && min_after <= max_before) ||
+ (min_before <= max_after && max_after <= max_before)))
+ return;
+
+ + hb_iter (intersection)
+ | hb_map ([d, mask] (hb_codepoint_t g) { return (g + d) & mask; })
+ | hb_sink (c->output)
+ ;
+ }
+
+ void closure_lookups (hb_closure_lookups_context_t *c) const {}
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ {
+ if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
+ hb_codepoint_t d = deltaGlyphID;
+ hb_codepoint_t mask = get_mask ();
+
+ + hb_iter (this+coverage)
+ | hb_map ([d, mask] (hb_codepoint_t g) { return (g + d) & mask; })
+ | hb_sink (c->output)
+ ;
+ }
+
+ const Coverage &get_coverage () const { return this+coverage; }
+
+ bool would_apply (hb_would_apply_context_t *c) const
+ { return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; }
+
+ unsigned
+ get_glyph_alternates (hb_codepoint_t glyph_id,
+ unsigned start_offset,
+ unsigned *alternate_count /* IN/OUT. May be NULL. */,
+ hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */) const
+ {
+ unsigned int index = (this+coverage).get_coverage (glyph_id);
+ if (likely (index == NOT_COVERED))
+ {
+ if (alternate_count)
+ *alternate_count = 0;
+ return 0;
+ }
+
+ if (alternate_count && *alternate_count)
+ {
+ hb_codepoint_t d = deltaGlyphID;
+ hb_codepoint_t mask = get_mask ();
+
+ glyph_id = (glyph_id + d) & mask;
+
+ *alternate_glyphs = glyph_id;
+ *alternate_count = 1;
+ }
+
+ return 1;
+ }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+ hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
+ unsigned int index = (this+coverage).get_coverage (glyph_id);
+ if (likely (index == NOT_COVERED)) return_trace (false);
+
+ hb_codepoint_t d = deltaGlyphID;
+ hb_codepoint_t mask = get_mask ();
+
+ glyph_id = (glyph_id + d) & mask;
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->sync_so_far ();
+ c->buffer->message (c->font,
+ "replacing glyph at %u (single substitution)",
+ c->buffer->idx);
+ }
+
+ c->replace_glyph (glyph_id);
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->message (c->font,
+ "replaced glyph at %u (single substitution)",
+ c->buffer->idx - 1u);
+ }
+
+ return_trace (true);
+ }
+
+ template<typename Iterator,
+ hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_t))>
+ bool serialize (hb_serialize_context_t *c,
+ Iterator glyphs,
+ unsigned delta)
+ {
+ TRACE_SERIALIZE (this);
+ if (unlikely (!c->extend_min (this))) return_trace (false);
+ if (unlikely (!coverage.serialize_serialize (c, glyphs))) return_trace (false);
+ c->check_assign (deltaGlyphID, delta, HB_SERIALIZE_ERROR_INT_OVERFLOW);
+ return_trace (true);
+ }
+
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
+ const hb_map_t &glyph_map = *c->plan->glyph_map;
+
+ hb_codepoint_t d = deltaGlyphID;
+ hb_codepoint_t mask = get_mask ();
+
+ hb_set_t intersection;
+ (this+coverage).intersect_set (glyphset, intersection);
+
+ auto it =
+ + hb_iter (intersection)
+ | hb_map_retains_sorting ([d, mask] (hb_codepoint_t g) {
+ return hb_codepoint_pair_t (g,
+ (g + d) & mask); })
+ | hb_filter (glyphset, hb_second)
+ | hb_map_retains_sorting ([&] (hb_codepoint_pair_t p) -> hb_codepoint_pair_t
+ { return hb_pair (glyph_map[p.first], glyph_map[p.second]); })
+ ;
+
+ bool ret = bool (it);
+ SingleSubst_serialize (c->serializer, it);
+ return_trace (ret);
+ }
+};
+
+}
+}
+}
+
+
+#endif /* OT_LAYOUT_GSUB_SINGLESUBSTFORMAT1_HH */