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-rw-r--r--gfx/harfbuzz/src/OT/Layout/GPOS/CursivePosFormat1.hh301
1 files changed, 301 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/OT/Layout/GPOS/CursivePosFormat1.hh b/gfx/harfbuzz/src/OT/Layout/GPOS/CursivePosFormat1.hh
new file mode 100644
index 0000000000..7f58fac8b8
--- /dev/null
+++ b/gfx/harfbuzz/src/OT/Layout/GPOS/CursivePosFormat1.hh
@@ -0,0 +1,301 @@
+#ifndef OT_LAYOUT_GPOS_CURSIVEPOSFORMAT1_HH
+#define OT_LAYOUT_GPOS_CURSIVEPOSFORMAT1_HH
+
+#include "Anchor.hh"
+
+namespace OT {
+namespace Layout {
+namespace GPOS_impl {
+
+struct EntryExitRecord
+{
+ friend struct CursivePosFormat1;
+
+ bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (entryAnchor.sanitize (c, base) && exitAnchor.sanitize (c, base));
+ }
+
+ void collect_variation_indices (hb_collect_variation_indices_context_t *c,
+ const void *src_base) const
+ {
+ (src_base+entryAnchor).collect_variation_indices (c);
+ (src_base+exitAnchor).collect_variation_indices (c);
+ }
+
+ EntryExitRecord* subset (hb_subset_context_t *c,
+ const void *src_base) const
+ {
+ TRACE_SERIALIZE (this);
+ auto *out = c->serializer->embed (this);
+ if (unlikely (!out)) return_trace (nullptr);
+
+ out->entryAnchor.serialize_subset (c, entryAnchor, src_base);
+ out->exitAnchor.serialize_subset (c, exitAnchor, src_base);
+ return_trace (out);
+ }
+
+ protected:
+ Offset16To<Anchor>
+ entryAnchor; /* Offset to EntryAnchor table--from
+ * beginning of CursivePos
+ * subtable--may be NULL */
+ Offset16To<Anchor>
+ exitAnchor; /* Offset to ExitAnchor table--from
+ * beginning of CursivePos
+ * subtable--may be NULL */
+ public:
+ DEFINE_SIZE_STATIC (4);
+};
+
+static void
+reverse_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction, unsigned int new_parent) {
+ int chain = pos[i].attach_chain(), type = pos[i].attach_type();
+ if (likely (!chain || 0 == (type & ATTACH_TYPE_CURSIVE)))
+ return;
+
+ pos[i].attach_chain() = 0;
+
+ unsigned int j = (int) i + chain;
+
+ /* Stop if we see new parent in the chain. */
+ if (j == new_parent)
+ return;
+
+ reverse_cursive_minor_offset (pos, j, direction, new_parent);
+
+ if (HB_DIRECTION_IS_HORIZONTAL (direction))
+ pos[j].y_offset = -pos[i].y_offset;
+ else
+ pos[j].x_offset = -pos[i].x_offset;
+
+ pos[j].attach_chain() = -chain;
+ pos[j].attach_type() = type;
+}
+
+
+struct CursivePosFormat1
+{
+ protected:
+ HBUINT16 format; /* Format identifier--format = 1 */
+ Offset16To<Coverage>
+ coverage; /* Offset to Coverage table--from
+ * beginning of subtable */
+ Array16Of<EntryExitRecord>
+ entryExitRecord; /* Array of EntryExit records--in
+ * Coverage Index order */
+ public:
+ DEFINE_SIZE_ARRAY (6, entryExitRecord);
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (coverage.sanitize (c, this) && entryExitRecord.sanitize (c, this));
+ }
+
+ bool intersects (const hb_set_t *glyphs) const
+ { return (this+coverage).intersects (glyphs); }
+
+ void closure_lookups (hb_closure_lookups_context_t *c) const {}
+
+ void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
+ {
+ + hb_zip (this+coverage, entryExitRecord)
+ | hb_filter (c->glyph_set, hb_first)
+ | hb_map (hb_second)
+ | hb_apply ([&] (const EntryExitRecord& record) { record.collect_variation_indices (c, this); })
+ ;
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ { if (unlikely (!(this+coverage).collect_coverage (c->input))) return; }
+
+ const Coverage &get_coverage () const { return this+coverage; }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+ hb_buffer_t *buffer = c->buffer;
+
+ const EntryExitRecord &this_record = entryExitRecord[(this+coverage).get_coverage (buffer->cur().codepoint)];
+ if (!this_record.entryAnchor) return_trace (false);
+
+ hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
+ skippy_iter.reset (buffer->idx, 1);
+ unsigned unsafe_from;
+ if (!skippy_iter.prev (&unsafe_from))
+ {
+ buffer->unsafe_to_concat_from_outbuffer (unsafe_from, buffer->idx + 1);
+ return_trace (false);
+ }
+
+ const EntryExitRecord &prev_record = entryExitRecord[(this+coverage).get_coverage (buffer->info[skippy_iter.idx].codepoint)];
+ if (!prev_record.exitAnchor)
+ {
+ buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
+ return_trace (false);
+ }
+
+ unsigned int i = skippy_iter.idx;
+ unsigned int j = buffer->idx;
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->message (c->font,
+ "cursive attaching glyph at %d to glyph at %d",
+ i, j);
+ }
+
+ buffer->unsafe_to_break (i, j + 1);
+ float entry_x, entry_y, exit_x, exit_y;
+ (this+prev_record.exitAnchor).get_anchor (c, buffer->info[i].codepoint, &exit_x, &exit_y);
+ (this+this_record.entryAnchor).get_anchor (c, buffer->info[j].codepoint, &entry_x, &entry_y);
+
+ hb_glyph_position_t *pos = buffer->pos;
+
+ hb_position_t d;
+ /* Main-direction adjustment */
+ switch (c->direction) {
+ case HB_DIRECTION_LTR:
+ pos[i].x_advance = roundf (exit_x) + pos[i].x_offset;
+
+ d = roundf (entry_x) + pos[j].x_offset;
+ pos[j].x_advance -= d;
+ pos[j].x_offset -= d;
+ break;
+ case HB_DIRECTION_RTL:
+ d = roundf (exit_x) + pos[i].x_offset;
+ pos[i].x_advance -= d;
+ pos[i].x_offset -= d;
+
+ pos[j].x_advance = roundf (entry_x) + pos[j].x_offset;
+ break;
+ case HB_DIRECTION_TTB:
+ pos[i].y_advance = roundf (exit_y) + pos[i].y_offset;
+
+ d = roundf (entry_y) + pos[j].y_offset;
+ pos[j].y_advance -= d;
+ pos[j].y_offset -= d;
+ break;
+ case HB_DIRECTION_BTT:
+ d = roundf (exit_y) + pos[i].y_offset;
+ pos[i].y_advance -= d;
+ pos[i].y_offset -= d;
+
+ pos[j].y_advance = roundf (entry_y);
+ break;
+ case HB_DIRECTION_INVALID:
+ default:
+ break;
+ }
+
+ /* Cross-direction adjustment */
+
+ /* We attach child to parent (think graph theory and rooted trees whereas
+ * the root stays on baseline and each node aligns itself against its
+ * parent.
+ *
+ * Optimize things for the case of RightToLeft, as that's most common in
+ * Arabic. */
+ unsigned int child = i;
+ unsigned int parent = j;
+ hb_position_t x_offset = entry_x - exit_x;
+ hb_position_t y_offset = entry_y - exit_y;
+ if (!(c->lookup_props & LookupFlag::RightToLeft))
+ {
+ unsigned int k = child;
+ child = parent;
+ parent = k;
+ x_offset = -x_offset;
+ y_offset = -y_offset;
+ }
+
+ /* If child was already connected to someone else, walk through its old
+ * chain and reverse the link direction, such that the whole tree of its
+ * previous connection now attaches to new parent. Watch out for case
+ * where new parent is on the path from old chain...
+ */
+ reverse_cursive_minor_offset (pos, child, c->direction, parent);
+
+ pos[child].attach_type() = ATTACH_TYPE_CURSIVE;
+ pos[child].attach_chain() = (int) parent - (int) child;
+ buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
+ if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
+ pos[child].y_offset = y_offset;
+ else
+ pos[child].x_offset = x_offset;
+
+ /* If parent was attached to child, separate them.
+ * https://github.com/harfbuzz/harfbuzz/issues/2469
+ */
+ if (unlikely (pos[parent].attach_chain() == -pos[child].attach_chain()))
+ {
+ pos[parent].attach_chain() = 0;
+ if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
+ pos[parent].y_offset = 0;
+ else
+ pos[parent].x_offset = 0;
+ }
+
+ if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
+ {
+ c->buffer->message (c->font,
+ "cursive attached glyph at %d to glyph at %d",
+ i, j);
+ }
+
+ buffer->idx++;
+ return_trace (true);
+ }
+
+ template <typename Iterator,
+ hb_requires (hb_is_iterator (Iterator))>
+ void serialize (hb_subset_context_t *c,
+ Iterator it,
+ const void *src_base)
+ {
+ if (unlikely (!c->serializer->extend_min ((*this)))) return;
+ this->format = 1;
+ this->entryExitRecord.len = it.len ();
+
+ for (const EntryExitRecord& entry_record : + it
+ | hb_map (hb_second))
+ entry_record.subset (c, src_base);
+
+ auto glyphs =
+ + it
+ | hb_map_retains_sorting (hb_first)
+ ;
+
+ coverage.serialize_serialize (c->serializer, glyphs);
+ }
+
+ 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;
+
+ auto *out = c->serializer->start_embed (*this);
+ if (unlikely (!out)) return_trace (false);
+
+ auto it =
+ + hb_zip (this+coverage, entryExitRecord)
+ | hb_filter (glyphset, hb_first)
+ | hb_map_retains_sorting ([&] (hb_pair_t<hb_codepoint_t, const EntryExitRecord&> p) -> hb_pair_t<hb_codepoint_t, const EntryExitRecord&>
+ { return hb_pair (glyph_map[p.first], p.second);})
+ ;
+
+ bool ret = bool (it);
+ out->serialize (c, it, this);
+ return_trace (ret);
+ }
+};
+
+
+}
+}
+}
+
+#endif /* OT_LAYOUT_GPOS_CURSIVEPOSFORMAT1_HH */
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