diff options
Diffstat (limited to 'gfx/harfbuzz/src/OT/Layout/GSUB/Sequence.hh')
| -rw-r--r-- | gfx/harfbuzz/src/OT/Layout/GSUB/Sequence.hh | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/OT/Layout/GSUB/Sequence.hh b/gfx/harfbuzz/src/OT/Layout/GSUB/Sequence.hh new file mode 100644 index 0000000000..fc50ac25df --- /dev/null +++ b/gfx/harfbuzz/src/OT/Layout/GSUB/Sequence.hh @@ -0,0 +1,165 @@ +#ifndef OT_LAYOUT_GSUB_SEQUENCE_HH
+#define OT_LAYOUT_GSUB_SEQUENCE_HH
+
+#include "Common.hh"
+
+namespace OT {
+namespace Layout {
+namespace GSUB_impl {
+
+template <typename Types>
+struct Sequence
+{
+ protected:
+ Array16Of<typename Types::HBGlyphID>
+ substitute; /* String of GlyphIDs to substitute */
+ public:
+ DEFINE_SIZE_ARRAY (2, substitute);
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (substitute.sanitize (c));
+ }
+
+ bool intersects (const hb_set_t *glyphs) const
+ { return hb_all (substitute, glyphs); }
+
+ void closure (hb_closure_context_t *c) const
+ { c->output->add_array (substitute.arrayZ, substitute.len); }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ { c->output->add_array (substitute.arrayZ, substitute.len); }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+ unsigned int count = substitute.len;
+
+ /* Special-case to make it in-place and not consider this
+ * as a "multiplied" substitution. */
+ if (unlikely (count == 1))
+ {
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->sync_so_far ();
+ c->buffer->message (c->font,
+ "replacing glyph at %u (multiple substitution)",
+ c->buffer->idx);
+ }
+
+ c->replace_glyph (substitute.arrayZ[0]);
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->message (c->font,
+ "replaced glyph at %u (multiple subtitution)",
+ c->buffer->idx - 1u);
+ }
+
+ return_trace (true);
+ }
+ /* Spec disallows this, but Uniscribe allows it.
+ * https://github.com/harfbuzz/harfbuzz/issues/253 */
+ else if (unlikely (count == 0))
+ {
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->sync_so_far ();
+ c->buffer->message (c->font,
+ "deleting glyph at %u (multiple substitution)",
+ c->buffer->idx);
+ }
+
+ c->buffer->delete_glyph ();
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->sync_so_far ();
+ c->buffer->message (c->font,
+ "deleted glyph at %u (multiple substitution)",
+ c->buffer->idx);
+ }
+
+ return_trace (true);
+ }
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->sync_so_far ();
+ c->buffer->message (c->font,
+ "multiplying glyph at %u",
+ c->buffer->idx);
+ }
+
+ unsigned int klass = _hb_glyph_info_is_ligature (&c->buffer->cur()) ?
+ HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH : 0;
+ unsigned lig_id = _hb_glyph_info_get_lig_id (&c->buffer->cur());
+
+ for (unsigned int i = 0; i < count; i++)
+ {
+ /* If is attached to a ligature, don't disturb that.
+ * https://github.com/harfbuzz/harfbuzz/issues/3069 */
+ if (!lig_id)
+ _hb_glyph_info_set_lig_props_for_component (&c->buffer->cur(), i);
+ c->output_glyph_for_component (substitute.arrayZ[i], klass);
+ }
+ c->buffer->skip_glyph ();
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->sync_so_far ();
+
+ char buf[HB_MAX_CONTEXT_LENGTH * 16] = {0};
+ char *p = buf;
+
+ for (unsigned i = c->buffer->idx - count; i < c->buffer->idx; i++)
+ {
+ if (buf < p)
+ *p++ = ',';
+ snprintf (p, sizeof(buf) - (p - buf), "%u", i);
+ p += strlen(p);
+ }
+
+ c->buffer->message (c->font,
+ "multiplied glyphs at %s",
+ buf);
+ }
+
+ return_trace (true);
+ }
+
+ template <typename Iterator,
+ hb_requires (hb_is_source_of (Iterator, hb_codepoint_t))>
+ bool serialize (hb_serialize_context_t *c,
+ Iterator subst)
+ {
+ TRACE_SERIALIZE (this);
+ return_trace (substitute.serialize (c, subst));
+ }
+
+ 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;
+
+ if (!intersects (&glyphset)) return_trace (false);
+
+ auto it =
+ + hb_iter (substitute)
+ | hb_map (glyph_map)
+ ;
+
+ auto *out = c->serializer->start_embed (*this);
+ return_trace (out->serialize (c->serializer, it));
+ }
+};
+
+
+}
+}
+}
+
+
+#endif /* OT_LAYOUT_GSUB_SEQUENCE_HH */
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