[indic] Disallow vowel mark combinations that spoof other vowel marks

Fixes https://github.com/harfbuzz/harfbuzz/issues/1019

New numbers:

BENGALI: 353725 out of 354188 tests passed. 463 failed (0.130722%)
DEVANAGARI: 707261 out of 707394 tests passed. 133 failed (0.0188014%)
GUJARATI: 366353 out of 366457 tests passed. 104 failed (0.0283799%)
GURMUKHI: 60729 out of 60747 tests passed. 18 failed (0.0296311%)
KANNADA: 951300 out of 951913 tests passed. 613 failed (0.0643966%)
MALAYALAM: 1048136 out of 1048334 tests passed. 198 failed (0.0188871%)
ORIYA: 42327 out of 42329 tests passed. 2 failed (0.00472489%)
SINHALA: 271596 out of 271847 tests passed. 251 failed (0.0923313%)
TAMIL: 1091754 out of 1091754 tests passed. 0 failed (0%)
TELUGU: 970555 out of 970573 tests passed. 18 failed (0.00185457%)

Devanagari regressed because Uniscribe doesn't enforce the full set.

Tests added with the *-vowel-letters.txt files in tree and Noto fonts.

11 files changed, 309 insertions, 1 deletions

diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index c230be8b..d169b2b3 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -331,6 +331,260 @@ data_destroy_indic (void *data)
   free (data);
 }
 
+static void
+preprocess_text_indic (const hb_ot_shape_plan_t *plan,
+		       hb_buffer_t              *buffer,
+		       hb_font_t                *font)
+{
+  /* UGLY UGLY UGLY business of adding dotted-circle in the middle of
+   * vowel-sequences that look like another vowel.  Data for each script
+   * collected from Unicode 11 book, tables named "Vowel Letters" with
+   * "Use" and "Do Not Use" columns.
+   *
+   * https://github.com/harfbuzz/harfbuzz/issues/1019
+   */
+  bool processed = false;
+  buffer->clear_output ();
+  unsigned int count = buffer->len;
+  switch ((unsigned) buffer->props.script)
+  {
+    case HB_SCRIPT_DEVANAGARI:
+      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
+      {
+	bool matched = false;
+	switch (buffer->cur().codepoint)
+	{
+	  case 0x0905u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x093Au: case 0x093Bu: case 0x093Eu: case 0x0945u:
+	      case 0x0946u: case 0x0949u: case 0x094Au: case 0x094Bu:
+	      case 0x094Cu: case 0x094Fu: case 0x0956u: case 0x0957u:
+		matched = true;
+		break;
+	    }
+	    break;
+	  case 0x0906u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x093Au: case 0x0945u: case 0x0946u: case 0x0947u:
+	      case 0x0948u:
+		matched = true;
+		break;
+	    }
+	    break;
+	  case 0x0909u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x0941u:
+		matched = true;
+		break;
+	    }
+	    break;
+	  case 0x090Fu:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x0945u: case 0x0946u: case 0x0947u:
+		matched = true;
+		break;
+	    }
+	    break;
+	  case 0x0930u:
+	    if (0x094Du == buffer->cur(1).codepoint &&
+		buffer->idx + 2 < count &&
+	        0x0907u == buffer->cur(2).codepoint)
+	    {
+	      buffer->next_glyph ();
+	      buffer->next_glyph ();
+	      buffer->output_glyph (0x25CCu);
+	    }
+	    break;
+	}
+	buffer->next_glyph ();
+	if (matched) { buffer->output_glyph (0x25CCu); buffer->next_glyph (); }
+      }
+      processed = true;
+      break;
+
+    case HB_SCRIPT_BENGALI:
+      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
+      {
+	bool matched = false;
+	switch (buffer->cur().codepoint)
+	{
+	  case 0x0985u: matched = 0x09BE == buffer->cur(1).codepoint; break;
+	  case 0x098Bu: matched = 0x09C3 == buffer->cur(1).codepoint; break;
+	  case 0x098Cu: matched = 0x09E2 == buffer->cur(1).codepoint; break;
+	}
+	buffer->next_glyph ();
+	if (matched) { buffer->output_glyph (0x25CCu); buffer->next_glyph (); }
+      }
+      processed = true;
+      break;
+
+    case HB_SCRIPT_GURMUKHI:
+      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
+      {
+	bool matched = false;
+	switch (buffer->cur().codepoint)
+	{
+	  case 0x0A05u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x0A3Eu: case 0x0A48u: case 0x0A4Cu:
+		matched = true;
+		break;
+	    }
+	    break;
+	  case 0x0A72u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x0A3Fu: case 0x0A40u: case 0x0A47u:
+		matched = true;
+		break;
+	    }
+	    break;
+	  case 0x0A73u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x0A41u: case 0x0A42u: case 0x0A4Bu:
+		matched = true;
+		break;
+	    }
+	    break;
+	}
+	buffer->next_glyph ();
+	if (matched) { buffer->output_glyph (0x25CCu); buffer->next_glyph (); }
+      }
+      processed = true;
+      break;
+
+    case HB_SCRIPT_GUJARATI:
+      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
+      {
+	bool matched = false;
+	switch (buffer->cur().codepoint)
+	{
+	  case 0x0A85u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x0ABEu: case 0x0AC5u: case 0x0AC7u: case 0x0AC8u:
+	      case 0x0AC9u: case 0x0ACBu: case 0x0ACCu:
+		matched = true;
+		break;
+	    }
+	    break;
+	  case 0x0AC5u:
+	    matched = 0x0ABE == buffer->cur(1).codepoint; break;
+	    break;
+	}
+	buffer->next_glyph ();
+	if (matched) { buffer->output_glyph (0x25CCu); buffer->next_glyph (); }
+      }
+      processed = true;
+      break;
+
+    case HB_SCRIPT_ORIYA:
+      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
+      {
+	bool matched = false;
+	switch (buffer->cur().codepoint)
+	{
+	  case 0x0B05u:
+	    matched = 0x0B3E == buffer->cur(1).codepoint;
+	    break;
+	  case 0x0B0Fu: case 0x0B13u:
+	    matched = 0x0B57 == buffer->cur(1).codepoint;
+	    break;
+	}
+	buffer->next_glyph ();
+	if (matched) { buffer->output_glyph (0x25CCu); buffer->next_glyph (); }
+      }
+      processed = true;
+      break;
+
+    case HB_SCRIPT_TELUGU:
+      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
+      {
+	bool matched = false;
+	switch (buffer->cur().codepoint)
+	{
+	  case 0x0C12u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x0C4Cu: case 0x0C55u:
+		matched = true;
+		break;
+	    }
+	    break;
+	  case 0x0C3Fu: case 0x0C46u: case 0xC4Au:
+	    matched = 0x0C55 == buffer->cur(1).codepoint;
+	    break;
+	}
+	buffer->next_glyph ();
+	if (matched) { buffer->output_glyph (0x25CCu); buffer->next_glyph (); }
+      }
+      processed = true;
+      break;
+
+    case HB_SCRIPT_KANNADA:
+      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
+      {
+	bool matched = false;
+	switch (buffer->cur().codepoint)
+	{
+	  case 0x0C89u: case 0x0C8Bu:
+	    matched = 0x0CBE == buffer->cur(1).codepoint;
+	    break;
+	  case 0x0C92u:
+	    matched = 0x0CCC == buffer->cur(1).codepoint;
+	    break;
+	}
+	buffer->next_glyph ();
+	if (matched) { buffer->output_glyph (0x25CCu); buffer->next_glyph (); }
+      }
+      processed = true;
+      break;
+
+    case HB_SCRIPT_MALAYALAM:
+      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
+      {
+	bool matched = false;
+	switch (buffer->cur().codepoint)
+	{
+	  case 0x0D07u: case 0x0D09u:
+	    matched = 0x0D57 == buffer->cur(1).codepoint;
+	    break;
+	  case 0x0D0Eu:
+	    matched = 0x0D46 == buffer->cur(1).codepoint;
+	    break;
+	  case 0x0D12u:
+	    switch (buffer->cur(1).codepoint)
+	    {
+	      case 0x0D3Eu: case 0x0D57u:
+		matched = true;
+		break;
+	    }
+	    break;
+	}
+	buffer->next_glyph ();
+	if (matched) { buffer->output_glyph (0x25CCu); buffer->next_glyph (); }
+      }
+      processed = true;
+      break;
+
+    default:
+      break;
+  }
+  if (processed)
+  {
+    if (buffer->idx < count)
+      buffer->next_glyph ();
+    if (likely (buffer->successful))
+      buffer->swap_buffers ();
+  }
+}
+
 static indic_position_t
 consonant_position_from_face (const indic_shape_plan_t *indic_plan,
 			      const hb_codepoint_t consonant,
@@ -1615,7 +1869,7 @@ const hb_ot_complex_shaper_t _hb_ot_complex_shaper_indic =
   override_features_indic,
   data_create_indic,
   data_destroy_indic,
-  nullptr, /* preprocess_text */
+  preprocess_text_indic,
   nullptr, /* postprocess_glyphs */
   HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
   decompose_indic,
diff --git a/test/shaping/data/in-house/Makefile.sources b/test/shaping/data/in-house/Makefile.sources
index a79ab041..293bb14f 100644
--- a/test/shaping/data/in-house/Makefile.sources
+++ b/test/shaping/data/in-house/Makefile.sources
@@ -27,6 +27,7 @@ TESTS = \
 	tests/indic-script-extensions.tests \
 	tests/indic-special-cases.tests \
 	tests/indic-syllable.tests \
+	tests/indic-vowel-letter-spoofing.tests \
 	tests/khmer-mark-order.tests \
 	tests/khmer-misc.tests \
 	tests/language-tags.tests \
diff --git a/test/shaping/data/in-house/fonts/03e3f463c3a985bc42096620cc415342818454fb.ttf b/test/shaping/data/in-house/fonts/03e3f463c3a985bc42096620cc415342818454fb.ttf
new file mode 100644
index 00000000..ee540f3b
--- /dev/null
+++ b/test/shaping/data/in-house/fonts/03e3f463c3a985bc42096620cc415342818454fb.ttf
diff --git a/test/shaping/data/in-house/fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf b/test/shaping/data/in-house/fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf
new file mode 100644
index 00000000..383aee66
--- /dev/null
+++ b/test/shaping/data/in-house/fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf
diff --git a/test/shaping/data/in-house/fonts/2c25beb56d9c556622d56b0b5d02b4670c034f89.ttf b/test/shaping/data/in-house/fonts/2c25beb56d9c556622d56b0b5d02b4670c034f89.ttf
new file mode 100644
index 00000000..ef94d3fc
--- /dev/null
+++ b/test/shaping/data/in-house/fonts/2c25beb56d9c556622d56b0b5d02b4670c034f89.ttf
diff --git a/test/shaping/data/in-house/fonts/604026ae5aaca83c49cd8416909d71ba3e1c1194.ttf b/test/shaping/data/in-house/fonts/604026ae5aaca83c49cd8416909d71ba3e1c1194.ttf
new file mode 100644
index 00000000..a6f1c9df
--- /dev/null
+++ b/test/shaping/data/in-house/fonts/604026ae5aaca83c49cd8416909d71ba3e1c1194.ttf
diff --git a/test/shaping/data/in-house/fonts/738d9f3b8c2dfd03875bf35a61d28fd78faf17c8.ttf b/test/shaping/data/in-house/fonts/738d9f3b8c2dfd03875bf35a61d28fd78faf17c8.ttf
new file mode 100644
index 00000000..c3e4167f
--- /dev/null
+++ b/test/shaping/data/in-house/fonts/738d9f3b8c2dfd03875bf35a61d28fd78faf17c8.ttf
diff --git a/test/shaping/data/in-house/fonts/7d18685e1529e4ceaad5b6095dfab2f9789e5bce.ttf b/test/shaping/data/in-house/fonts/7d18685e1529e4ceaad5b6095dfab2f9789e5bce.ttf
new file mode 100644
index 00000000..ffdddf32
--- /dev/null
+++ b/test/shaping/data/in-house/fonts/7d18685e1529e4ceaad5b6095dfab2f9789e5bce.ttf
diff --git a/test/shaping/data/in-house/fonts/881642af1667ae30a54e58de8be904566d00508f.ttf b/test/shaping/data/in-house/fonts/881642af1667ae30a54e58de8be904566d00508f.ttf
new file mode 100644
index 00000000..a749cdf4
--- /dev/null
+++ b/test/shaping/data/in-house/fonts/881642af1667ae30a54e58de8be904566d00508f.ttf
diff --git a/test/shaping/data/in-house/fonts/af85624080af5627fb050f570d148a62f04fda74.ttf b/test/shaping/data/in-house/fonts/af85624080af5627fb050f570d148a62f04fda74.ttf
new file mode 100644
index 00000000..9cd40d4e
--- /dev/null
+++ b/test/shaping/data/in-house/fonts/af85624080af5627fb050f570d148a62f04fda74.ttf
diff --git a/test/shaping/data/in-house/tests/indic-vowel-letter-spoofing.tests b/test/shaping/data/in-house/tests/indic-vowel-letter-spoofing.tests
new file mode 100644
index 00000000..f8305a31
--- /dev/null
+++ b/test/shaping/data/in-house/tests/indic-vowel-letter-spoofing.tests
@@ -0,0 +1,53 @@
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0904,U+0020,U+0905,U+0946:[ashortdeva=0+764|space=1+260|adeva=2+764|uni25CC=2+510|eshortvowelsigndeva=2+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0906,U+0020,U+0905,U+093E:[aadeva=0+1023|space=1+260|adeva=2+764|uni25CC=2+510|aavowelsigndeva=2+259]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0908,U+0020,U+0930,U+094D,U+0907:[iideva=0+491|space=1+260|uni25CC=2+510|rephdeva=2+0|ideva=2+491]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+090A,U+0020,U+0909,U+0941:[uudeva=0+765|space=1+260|udeva=2+548|uni25CC=2+510|uvowelsigndeva=2+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+090D,U+0020,U+090F,U+0945:[ecandradeva=0+553|space=1+260|edeva=2+553|uni25CC=2+510|ecandravowelsigndeva=2+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+090E,U+0020,U+090F,U+0946:[eshortdeva=0+553|space=1+260|edeva=2+553|uni25CC=2+510|eshortvowelsigndeva=2+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0910,U+0020,U+090F,U+0947:[aideva=0+553|space=1+260|edeva=2+553|uni25CC=2+510|evowelsigndeva=2+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0911,U+0020,U+0905,U+0949,U+0020,U+0906,U+0945:[ocandradeva=0+1023|space=1+260|adeva=2+764|uni25CC=2+510|ocandravowelsigndeva=2+259|space=4+260|aadeva=5+1023|uni25CC=5+510|ecandravowelsigndeva=5+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0912,U+0020,U+0905,U+094A,U+0020,U+0906,U+0946:[oshortdeva=0+1023|space=1+260|adeva=2+764|uni25CC=2+510|oshortvowelsigndeva=2+259|space=4+260|aadeva=5+1023|uni25CC=5+510|eshortvowelsigndeva=5+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0913,U+0020,U+0905,U+094B,U+0020,U+0906,U+0947:[odeva=0+1023|space=1+260|adeva=2+764|uni25CC=2+510|ovowelsigndeva=2+259|space=4+260|aadeva=5+1023|uni25CC=5+510|evowelsigndeva=5+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0914,U+0020,U+0905,U+094C,U+0020,U+0906,U+0948:[audeva=0+1023|space=1+260|adeva=2+764|uni25CC=2+510|auvowelsigndeva=2+259|space=4+260|aadeva=5+1023|uni25CC=5+510|aivowelsigndeva=5+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0972,U+0020,U+0905,U+0945:[acandradeva=0+764|space=1+260|adeva=2+764|uni25CC=2+510|ecandravowelsigndeva=2+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0973,U+0020,U+0905,U+093A:[oedeva=0+764|space=1+260|adeva=2+764|uni25CC=2+510|oevowelsigndeva=2+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0974,U+0020,U+0905,U+093B,U+0020,U+0906,U+093A:[ooedeva=0+1023|space=1+260|adeva=2+764|uni25CC=2+510|ooevowelsigndeva=2+259|space=4+260|aadeva=5+1023|uni25CC=5+510|oevowelsigndeva=5+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0975,U+0020,U+0905,U+094F:[awdeva=0+1023|space=1+260|adeva=2+764|uni25CC=2+510|awvowelsigndeva=2+259]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0976,U+0020,U+0905,U+0956:[uedeva=0+764|space=1+260|adeva=2+764|uni25CC=2+510|uevowelsigndeva=2@50,0+0]
+../fonts/1a5face3fcbd929d228235c2f72bbd6f8eb37424.ttf::U+0977,U+0020,U+0905,U+0957:[uuedeva=0+764|space=1+260|adeva=2+764|uni25CC=2+510|uuevowelsigndeva=2@50,0+0]
+../fonts/881642af1667ae30a54e58de8be904566d00508f.ttf::U+0986,U+0020,U+0985,U+09BE:[aabeng=0+1158|space=1+260|abeng=2+893|uni25CC=2+510|aavowelsignbeng=2+266]
+../fonts/881642af1667ae30a54e58de8be904566d00508f.ttf::U+09E0,U+0020,U+098B,U+09C3:[rrvocalicbeng=0+853|space=1+260|rvocalicbeng=2+853|uni25CC=2+510|rvocalicvowelsignbeng=2+0]
+../fonts/881642af1667ae30a54e58de8be904566d00508f.ttf::U+09E1,U+0020,U+098C,U+09E2:[llvocalicbeng=0+639|space=1+260|lvocalicbeng=2+639|uni25CC=2+510|lvocalicvowelsignbeng=2+0]
+../fonts/604026ae5aaca83c49cd8416909d71ba3e1c1194.ttf::U+0A06,U+0020,U+0A05,U+0A3E:[aaguru=0+2001|space=1+532|aguru=2+1520|uni25CC=2+1044|aamatraguru=2+481]
+../fonts/604026ae5aaca83c49cd8416909d71ba3e1c1194.ttf::U+0A07,U+0020,U+0A72,U+0A3F:[iguru=0+1671|space=1+532|iriguru=2+1141|imatraguru=2+530|uni25CC=2+1044]
+../fonts/604026ae5aaca83c49cd8416909d71ba3e1c1194.ttf::U+0A08,U+0020,U+0A72,U+0A40:[iiguru=0+1671|space=1+532|iriguru=2+1141|uni25CC=2+1044|iimatraguru=2+530]
+../fonts/604026ae5aaca83c49cd8416909d71ba3e1c1194.ttf::U+0A09,U+0020,U+0A73,U+0A41:[uguru=0+1356|space=1+532|uraguru=2+1356|uni25CC=2+1044|umatraguru=2@102,0+0]
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