1 files changed, 100 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-syllabic.cc b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-syllabic.cc
new file mode 100644
index 00000000000..46509abee23
--- /dev/null
+++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-shape-complex-syllabic.cc
@@ -0,0 +1,100 @@
+/*
+ * Copyright © 2021  Behdad Esfahbod.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ */
+
+#include "hb.hh"
+
+#ifndef HB_NO_OT_SHAPE
+
+#include "hb-ot-shape-complex-syllabic.hh"
+
+
+void
+hb_syllabic_insert_dotted_circles (hb_font_t *font,
+				   hb_buffer_t *buffer,
+				   unsigned int broken_syllable_type,
+				   unsigned int dottedcircle_category,
+				   int repha_category)
+{
+  if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE))
+    return;
+
+  /* Note: This loop is extra overhead, but should not be measurable.
+   * TODO Use a buffer scratch flag to remove the loop. */
+  bool has_broken_syllables = false;
+  unsigned int count = buffer->len;
+  hb_glyph_info_t *info = buffer->info;
+  for (unsigned int i = 0; i < count; i++)
+    if ((info[i].syllable() & 0x0F) == broken_syllable_type)
+    {
+      has_broken_syllables = true;
+      break;
+    }
+  if (likely (!has_broken_syllables))
+    return;
+
+
+  hb_codepoint_t dottedcircle_glyph;
+  if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph))
+    return;
+
+  hb_glyph_info_t dottedcircle = {0};
+  dottedcircle.codepoint = 0x25CCu;
+  dottedcircle.complex_var_u8_category() = dottedcircle_category;
+  dottedcircle.codepoint = dottedcircle_glyph;
+
+  buffer->clear_output ();
+
+  buffer->idx = 0;
+  unsigned int last_syllable = 0;
+  while (buffer->idx < buffer->len && buffer->successful)
+  {
+    unsigned int syllable = buffer->cur().syllable();
+    if (unlikely (last_syllable != syllable && (syllable & 0x0F) == broken_syllable_type))
+    {
+      last_syllable = syllable;
+
+      hb_glyph_info_t ginfo = dottedcircle;
+      ginfo.cluster = buffer->cur().cluster;
+      ginfo.mask = buffer->cur().mask;
+      ginfo.syllable() = buffer->cur().syllable();
+
+      /* Insert dottedcircle after possible Repha. */
+      if (repha_category != -1)
+      {
+	while (buffer->idx < buffer->len && buffer->successful &&
+	       last_syllable == buffer->cur().syllable() &&
+	       buffer->cur().complex_var_u8_category() == (unsigned) repha_category)
+	  (void) buffer->next_glyph ();
+      }
+
+      (void) buffer->output_info (ginfo);
+    }
+    else
+      (void) buffer->next_glyph ();
+  }
+  buffer->swap_buffers ();
+}
+
+
+#endif