From 95230e291dddc20185e6a34b69836631d894c0d8 Mon Sep 17 00:00:00 2001
From: Qunxin Liu <qxliu@google.com>
Date: Thu, 18 Mar 2021 17:41:25 -0700
Subject: [PATCH] [subset] support subsetting GSUB8

---
 src/hb-ot-layout-gsub-table.hh                |  73 +++++++++++++++++-
 test/subset/data/Makefile.am                  |   1 +
 test/subset/data/Makefile.sources             |   1 +
 ...retain-gids.41,42,43,44,45,46,47,48,49.otf | Bin 0 -> 3172 bytes
 ...ayout-retain-gids.41,42,43,44,45,46,47.otf | Bin 0 -> 2796 bytes
 ...ayout-retain-gids.41,42,43,44,45,46,4D.otf | Bin 0 -> 2860 bytes
 ...ayout-retain-gids.41,42,43,44,45,46,51.otf | Bin 0 -> 2864 bytes
 ...p-layout-retain-gids.41,42,43,44,45,46.otf | Bin 0 -> 2540 bytes
 ...eated.keep-layout-retain-gids.41,42,43.otf | Bin 0 -> 1984 bytes
 ...lly_created.keep-layout-retain-gids.41.otf | Bin 0 -> 1872 bytes
 ...lly_created.keep-layout-retain-gids.61.otf | Bin 0 -> 2584 bytes
 ...ayout-retain-gids.retain-all-codepoint.otf | Bin 0 -> 3832 bytes
 ...keep-layout.41,42,43,44,45,46,47,48,49.otf | Bin 0 -> 2384 bytes
 ...eated.keep-layout.41,42,43,44,45,46,47.otf | Bin 0 -> 1996 bytes
 ...eated.keep-layout.41,42,43,44,45,46,4D.otf | Bin 0 -> 1996 bytes
 ...eated.keep-layout.41,42,43,44,45,46,51.otf | Bin 0 -> 2044 bytes
 ..._created.keep-layout.41,42,43,44,45,46.otf | Bin 0 -> 1832 bytes
 ..._manually_created.keep-layout.41,42,43.otf | Bin 0 -> 1284 bytes
 .../gsub8_manually_created.keep-layout.41.otf | Bin 0 -> 1172 bytes
 .../gsub8_manually_created.keep-layout.61.otf | Bin 0 -> 1540 bytes
 ...eated.keep-layout.retain-all-codepoint.otf | Bin 0 -> 3832 bytes
 .../data/fonts/gsub8_manually_created.otf     | Bin 0 -> 4824 bytes
 test/subset/data/tests/layout.gsub8.tests     |  17 ++++
 test/subset/meson.build                       |   1 +
 24 files changed, 91 insertions(+), 2 deletions(-)
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46,47,48,49.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46,47.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46,4D.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46,51.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.61.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.retain-all-codepoint.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.41,42,43,44,45,46,47,48,49.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.41,42,43,44,45,46,47.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.41,42,43,44,45,46,4D.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.41,42,43,44,45,46,51.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.41,42,43,44,45,46.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.41,42,43.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.41.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.61.otf
 create mode 100644 test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout.retain-all-codepoint.otf
 create mode 100644 test/subset/data/fonts/gsub8_manually_created.otf
 create mode 100644 test/subset/data/tests/layout.gsub8.tests

diff --git a/src/hb-ot-layout-gsub-table.hh b/src/hb-ot-layout-gsub-table.hh
index 062eea6ff..943acf5ad 100644
--- a/src/hb-ot-layout-gsub-table.hh
+++ b/src/hb-ot-layout-gsub-table.hh
@@ -1274,11 +1274,80 @@ struct ReverseChainSingleSubstFormat1
     return_trace (false);
   }
 
+  template<typename Iterator,
+           hb_requires (hb_is_iterator (Iterator))>
+  bool serialize_coverage_offset_array (hb_subset_context_t *c, Iterator it) const
+  {
+    TRACE_SERIALIZE (this);
+    auto *out = c->serializer->start_embed<OffsetArrayOf<Coverage>> ();
+
+    if (unlikely (!c->serializer->allocate_size<HBUINT16> (HBUINT16::static_size)))
+      return_trace (false);
+
+    for (auto& offset : it) {
+      auto *o = out->serialize_append (c->serializer);
+      if (unlikely (!o) || !o->serialize_subset (c, offset, this))
+        return_trace (false);
+    }
+
+    return_trace (true);
+  }
+
+  template<typename Iterator, typename BacktrackIterator, typename LookaheadIterator,
+           hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_pair_t)),
+           hb_requires (hb_is_iterator (BacktrackIterator)),
+           hb_requires (hb_is_iterator (LookaheadIterator))>
+  bool serialize (hb_subset_context_t *c,
+                  Iterator coverage_subst_iter,
+                  BacktrackIterator backtrack_iter,
+                  LookaheadIterator lookahead_iter) const
+  {
+    TRACE_SERIALIZE (this);
+
+    auto *out = c->serializer->start_embed (this);
+    if (unlikely (!c->serializer->check_success (out))) return_trace (false);
+    if (unlikely (!c->serializer->embed (this->format))) return_trace (false);
+    if (unlikely (!c->serializer->embed (this->coverage))) return_trace (false);
+
+    if (!serialize_coverage_offset_array (c, backtrack_iter)) return_trace (false);
+    if (!serialize_coverage_offset_array (c, lookahead_iter)) return_trace (false);
+
+    auto *substitute_out = c->serializer->start_embed<ArrayOf<HBGlyphID>> ();
+    auto substitutes =
+    + coverage_subst_iter
+    | hb_map (hb_second)
+    ;
+
+    auto glyphs =
+    + coverage_subst_iter
+    | hb_map_retains_sorting (hb_first)
+    ;
+    if (unlikely (! c->serializer->check_success (substitute_out->serialize (c->serializer, substitutes))))
+        return_trace (false);
+
+    if (unlikely (!out->coverage.serialize (c->serializer, out).serialize (c->serializer, glyphs)))
+      return_trace (false);
+    return_trace (true);
+  }
+
   bool subset (hb_subset_context_t *c) const
   {
     TRACE_SUBSET (this);
-    // TODO(subset)
-    return_trace (false);
+    const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
+    const hb_map_t &glyph_map = *c->plan->glyph_map;
+
+    const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage>> (backtrack);
+    const ArrayOf<HBGlyphID> &substitute = StructAfter<ArrayOf<HBGlyphID>> (lookahead);
+
+    auto it =
+    + hb_zip (this+coverage, substitute)
+    | hb_filter (glyphset, hb_first)
+    | hb_filter (glyphset, hb_second)
+    | hb_map_retains_sorting ([&] (hb_pair_t<hb_codepoint_t, const HBGlyphID &> p) -> hb_codepoint_pair_t
+                              { return hb_pair (glyph_map[p.first], glyph_map[p.second]); })
+    ;
+
+    return_trace (bool (it) && serialize (c, it, backtrack.iter (), lookahead.iter ()));
   }
 
   bool sanitize (hb_sanitize_context_t *c) const
diff --git a/test/subset/data/Makefile.am b/test/subset/data/Makefile.am
index 73585f85c..6239adb8b 100644
--- a/test/subset/data/Makefile.am
+++ b/test/subset/data/Makefile.am
@@ -25,6 +25,7 @@ EXTRA_DIST += \
 	expected/layout.gsub3 \
 	expected/layout.gsub5 \
 	expected/layout.gsub6 \
+	expected/layout.gsub8 \
 	expected/layout.gdef \
 	expected/layout.context \
 	expected/layout.gdef-varstore \
diff --git a/test/subset/data/Makefile.sources b/test/subset/data/Makefile.sources
index 6275bfda8..433eeac03 100644
--- a/test/subset/data/Makefile.sources
+++ b/test/subset/data/Makefile.sources
@@ -24,6 +24,7 @@ TESTS = \
 	tests/layout.gsub3.tests \
 	tests/layout.gsub5.tests \
 	tests/layout.gsub6.tests \
+	tests/layout.gsub8.tests \
 	tests/layout.tests \
 	tests/sbix.tests \
 	$(NULL)
diff --git a/test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46,47,48,49.otf b/test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46,47,48,49.otf
new file mode 100644
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diff --git a/test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46,47.otf b/test/subset/data/expected/layout.gsub8/gsub8_manually_created.keep-layout-retain-gids.41,42,43,44,45,46,47.otf
new file mode 100644
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diff --git a/test/subset/data/fonts/gsub8_manually_created.otf b/test/subset/data/fonts/gsub8_manually_created.otf
new file mode 100644
index 0000000000000000000000000000000000000000..00cbb4bb30b88fcc97ba46b9230695bfe7e562dc
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diff --git a/test/subset/data/tests/layout.gsub8.tests b/test/subset/data/tests/layout.gsub8.tests
new file mode 100644
index 000000000..fdff43f8a
--- /dev/null
+++ b/test/subset/data/tests/layout.gsub8.tests
@@ -0,0 +1,17 @@
+FONTS:
+gsub8_manually_created.otf
+
+PROFILES:
+keep-layout.txt
+keep-layout-retain-gids.txt
+
+SUBSETS:
+a
+A
+ABC
+ABCDEF
+ABCDEFG
+ABCDEFGHI
+ABCDEFM
+ABCDEFQ
+*
diff --git a/test/subset/meson.build b/test/subset/meson.build
index 5da61a9e0..fa04117c2 100644
--- a/test/subset/meson.build
+++ b/test/subset/meson.build
@@ -17,6 +17,7 @@ tests = [
   'layout.gsub3',
   'layout.gsub5',
   'layout.gsub6',
+  'layout.gsub8',
   'layout.gdef',
   'layout.context',
   'layout.gdef-varstore',