From 3a0b05faf18afc5f1cfc436c55d0776d26b80e53 Mon Sep 17 00:00:00 2001
From: Qunxin Liu <qxliu@google.com>
Date: Thu, 6 Feb 2020 15:08:26 -0800
Subject: [PATCH] [subset] GPOS 5 MarkToLigature subsetting support

---
 src/hb-ot-layout-gpos-table.hh                | 109 ++++++++++++++++--
 test/subset/data/Makefile.am                  |   1 +
 test/subset/data/Makefile.sources             |   1 +
 ...t1.keep-layout-retain-gids.41,42,43,44.otf | Bin 0 -> 2372 bytes
 ...t1.keep-layout-retain-gids.41,42,43,45.otf | Bin 0 -> 2380 bytes
 ...font1.keep-layout-retain-gids.41,42,43.otf | Bin 0 -> 2132 bytes
 ...font1.keep-layout-retain-gids.41,42,44.otf | Bin 0 -> 2304 bytes
 ...font1.keep-layout-retain-gids.41,42,45.otf | Bin 0 -> 2284 bytes
 ...s5_font1.keep-layout-retain-gids.41,42.otf | Bin 0 -> 2032 bytes
 ...s5_font1.keep-layout-retain-gids.41,43.otf | Bin 0 -> 2048 bytes
 ...gpos5_font1.keep-layout-retain-gids.41.otf | Bin 0 -> 1916 bytes
 ...gpos5_font1.keep-layout-retain-gids.42.otf | Bin 0 -> 1788 bytes
 ...ayout-retain-gids.retain-all-codepoint.otf | Bin 0 -> 3840 bytes
 .../gpos5_font1.keep-layout.41,42,43,44.otf   | Bin 0 -> 1668 bytes
 .../gpos5_font1.keep-layout.41,42,43,45.otf   | Bin 0 -> 1660 bytes
 .../gpos5_font1.keep-layout.41,42,43.otf      | Bin 0 -> 1432 bytes
 .../gpos5_font1.keep-layout.41,42,44.otf      | Bin 0 -> 1588 bytes
 .../gpos5_font1.keep-layout.41,42,45.otf      | Bin 0 -> 1560 bytes
 .../gpos5_font1.keep-layout.41,42.otf         | Bin 0 -> 1328 bytes
 .../gpos5_font1.keep-layout.41,43.otf         | Bin 0 -> 1332 bytes
 .../gpos5_font1.keep-layout.41.otf            | Bin 0 -> 1216 bytes
 .../gpos5_font1.keep-layout.42.otf            | Bin 0 -> 1076 bytes
 ...font1.keep-layout.retain-all-codepoint.otf | Bin 0 -> 3840 bytes
 test/subset/data/fonts/gpos5_font1.otf        | Bin 0 -> 4780 bytes
 test/subset/data/tests/layout.gpos5.tests     |  18 +++
 25 files changed, 121 insertions(+), 8 deletions(-)
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43,44.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43,45.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,44.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,45.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,43.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.42.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.retain-all-codepoint.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,43,44.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,43,45.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,43.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,44.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,45.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,43.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.42.otf
 create mode 100644 test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.retain-all-codepoint.otf
 create mode 100644 test/subset/data/fonts/gpos5_font1.otf
 create mode 100644 test/subset/data/tests/layout.gpos5.tests

diff --git a/src/hb-ot-layout-gpos-table.hh b/src/hb-ot-layout-gpos-table.hh
index 2217d298f..63989bac7 100644
--- a/src/hb-ot-layout-gpos-table.hh
+++ b/src/hb-ot-layout-gpos-table.hh
@@ -544,8 +544,7 @@ struct AnchorMatrix
 	    hb_requires (hb_is_iterator (Iterator))>
   bool serialize (hb_serialize_context_t *c,
 		  unsigned                num_rows,
-		  AnchorMatrix const     *offset_matrix,
-		  const hb_map_t         *layout_variation_idx_map,
+		  const AnchorMatrix     *offset_matrix,
 		  Iterator                index_iter)
   {
     TRACE_SERIALIZE (this);
@@ -566,6 +565,27 @@ struct AnchorMatrix
     return_trace (true);
   }
 
+  bool subset (hb_subset_context_t *c,
+	       unsigned cols,
+	       const hb_map_t *klass_mapping) const
+  {
+    TRACE_SUBSET (this);
+    auto *out = c->serializer->start_embed (*this);
+
+    hb_vector_t<unsigned> indexes;
+    for (unsigned row : + hb_range ((unsigned) rows))
+    {
+      + hb_range (cols)
+      | hb_filter (klass_mapping)
+      | hb_map ([=] (const unsigned col) { return row * cols + col; })
+      | hb_sink (indexes)
+      ;
+    }
+
+    out->serialize (c->serializer, (unsigned) rows, this, indexes.iter ());
+    return_trace (true);
+  }
+
   bool sanitize (hb_sanitize_context_t *c, unsigned int cols) const
   {
     TRACE_SANITIZE (this);
@@ -2025,10 +2045,30 @@ typedef AnchorMatrix LigatureAttach;	/* component-major--
 					 * mark-minor--
 					 * ordered by class--zero-based. */
 
-typedef OffsetListOf<LigatureAttach> LigatureArray;
-					/* Array of LigatureAttach
-					 * tables ordered by
-					 * LigatureCoverage Index */
+/* Array of LigatureAttach tables ordered by LigatureCoverage Index */
+struct LigatureArray : OffsetListOf<LigatureAttach>
+{
+  template <typename Iterator,
+	    hb_requires (hb_is_iterator (Iterator))>
+  bool subset (hb_subset_context_t    *c,
+	       unsigned                cols,
+	       const hb_map_t         *klass_mapping,
+	       const LigatureArray    &src_lig_array,
+	       Iterator                ligature_iter)
+  {
+    TRACE_SERIALIZE (this);
+    if (!ligature_iter.len ()) return_trace (false);
+    if (unlikely (!c->serializer->extend_min ((*this))))  return_trace (false);
+
+    for (unsigned i : ligature_iter)
+    {
+      auto *out = serialize_append (c->serializer);
+      if (unlikely (!out)) break;
+      out->serialize_subset (c, src_lig_array.arrayZ[i], &src_lig_array, this, cols, klass_mapping);
+    }
+    return_trace (this->len);
+  }
+};
 
 struct MarkLigPosFormat1
 {
@@ -2130,8 +2170,61 @@ struct MarkLigPosFormat1
   bool subset (hb_subset_context_t *c) const
   {
     TRACE_SUBSET (this);
-    // TODO(subset)
-    return_trace (false);
+    const hb_set_t &glyphset = *c->plan->glyphset ();
+    const hb_map_t &glyph_map = *c->plan->glyph_map;
+
+    auto *out = c->serializer->start_embed (*this);
+    if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
+    out->format = format;
+
+    hb_map_t klass_mapping;
+    Markclass_closure_and_remap_indexes (this+markCoverage, this+markArray, glyphset, &klass_mapping);
+    
+    if (!klass_mapping.get_population ()) return_trace (false);
+    out->classCount = klass_mapping.get_population ();
+
+    auto mark_iter =
+    + hb_zip (this+markCoverage, this+markArray)
+    | hb_filter (glyphset, hb_first)
+    ;
+
+    hb_sorted_vector_t<hb_codepoint_t> new_coverage;
+    + mark_iter
+    | hb_map (hb_first)
+    | hb_map (glyph_map)
+    | hb_sink (new_coverage)
+    ;
+
+    if (!out->markCoverage.serialize (c->serializer, out)
+			  .serialize (c->serializer, new_coverage.iter ()))
+      return_trace (false);
+
+    out->markArray.serialize (c->serializer, out)
+		  .serialize (c->serializer, &klass_mapping, &(this+markArray), + mark_iter
+										| hb_map (hb_second));
+    
+    unsigned ligcount = (this+ligatureArray).len;
+    auto ligature_iter =
+    + hb_zip (this+ligatureCoverage, hb_range (ligcount))
+    | hb_filter (glyphset, hb_first)
+    ;
+
+    new_coverage.reset ();
+    + ligature_iter
+    | hb_map (hb_first)
+    | hb_map (glyph_map)
+    | hb_sink (new_coverage)
+    ;
+
+    if (!out->ligatureCoverage.serialize (c->serializer, out)
+			      .serialize (c->serializer, new_coverage.iter ()))
+      return_trace (false);
+
+    out->ligatureArray.serialize (c->serializer, out)
+		      .subset (c, (unsigned) classCount, &klass_mapping, this+ligatureArray, + ligature_iter
+											     | hb_map (hb_second));
+
+    return_trace (true);
   }
 
   bool sanitize (hb_sanitize_context_t *c) const
diff --git a/test/subset/data/Makefile.am b/test/subset/data/Makefile.am
index beb0a0411..47989b1c0 100644
--- a/test/subset/data/Makefile.am
+++ b/test/subset/data/Makefile.am
@@ -17,6 +17,7 @@ EXTRA_DIST += \
 	expected/layout.gpos2 \
 	expected/layout.gpos3 \
 	expected/layout.gpos4 \
+	expected/layout.gpos5 \
 	expected/layout.gpos6 \
 	expected/layout.gpos8 \
 	expected/layout.gsub3 \
diff --git a/test/subset/data/Makefile.sources b/test/subset/data/Makefile.sources
index bdc983552..718e7195c 100644
--- a/test/subset/data/Makefile.sources
+++ b/test/subset/data/Makefile.sources
@@ -16,6 +16,7 @@ TESTS = \
 	tests/layout.gpos2.tests \
 	tests/layout.gpos3.tests \
 	tests/layout.gpos4.tests \
+	tests/layout.gpos5.tests \
 	tests/layout.gpos6.tests \
 	tests/layout.gpos8.tests \
 	tests/layout.gsub3.tests \
diff --git a/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43,44.otf b/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43,44.otf
new file mode 100644
index 0000000000000000000000000000000000000000..13a1fb7850b1db697631d89a87f6832d87cdea06
GIT binary patch
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diff --git a/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43,45.otf b/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43,45.otf
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diff --git a/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43.otf b/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout-retain-gids.41,42,43.otf
new file mode 100644
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GIT binary patch
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new file mode 100644
index 0000000000000000000000000000000000000000..5d4fcee062c719845a678d7ce5779f80d6a44cfc
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diff --git a/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,43.otf b/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,43.otf
new file mode 100644
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diff --git a/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,44.otf b/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,44.otf
new file mode 100644
index 0000000000000000000000000000000000000000..d4c95a645054237bd3b836d60d73ee6aa8847739
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diff --git a/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,45.otf b/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42,45.otf
new file mode 100644
index 0000000000000000000000000000000000000000..656792d7257a318a3ef675ece1643cd38e45d788
GIT binary patch
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diff --git a/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42.otf b/test/subset/data/expected/layout.gpos5/gpos5_font1.keep-layout.41,42.otf
new file mode 100644
index 0000000000000000000000000000000000000000..cc2f5f7eec9f6ae43926362954770e7dbdbebcc8
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new file mode 100644
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diff --git a/test/subset/data/tests/layout.gpos5.tests b/test/subset/data/tests/layout.gpos5.tests
new file mode 100644
index 000000000..3f5ef0c41
--- /dev/null
+++ b/test/subset/data/tests/layout.gpos5.tests
@@ -0,0 +1,18 @@
+FONTS:
+gpos5_font1.otf
+
+PROFILES:
+keep-layout.txt
+keep-layout-retain-gids.txt
+
+SUBSETS:
+A
+B
+AB
+AC
+ABC
+ABE
+ABCE
+ABD
+ABCD
+*