1 files changed, 67 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-fallback.cc b/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-fallback.cc
index 3cb3456f1a..ea8312b223 100644
--- a/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-fallback.cc
+++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-fallback.cc
@@ -484,3 +484,70 @@ _hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan,
     idx = skippy_iter.idx;
   }
 }
+
+
+/* Adjusts width of various spaces. */
+void
+_hb_ot_shape_fallback_spaces (const hb_ot_shape_plan_t *plan,
+			      hb_font_t *font,
+			      hb_buffer_t  *buffer)
+{
+  if (!HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
+    return;
+
+  hb_glyph_info_t *info = buffer->info;
+  hb_glyph_position_t *pos = buffer->pos;
+  unsigned int count = buffer->len;
+  for (unsigned int i = 0; i < count; i++)
+    if (_hb_glyph_info_is_unicode_space (&info[i]) && !_hb_glyph_info_ligated (&info[i]))
+    {
+      hb_unicode_funcs_t::space_t space_type = _hb_glyph_info_get_unicode_space_fallback_type (&info[i]);
+      hb_codepoint_t glyph;
+      typedef hb_unicode_funcs_t t;
+      switch (space_type)
+      {
+	case t::NOT_SPACE: /* Shouldn't happen. */
+	case t::SPACE:
+	  break;
+
+	case t::SPACE_EM:
+	case t::SPACE_EM_2:
+	case t::SPACE_EM_3:
+	case t::SPACE_EM_4:
+	case t::SPACE_EM_5:
+	case t::SPACE_EM_6:
+	case t::SPACE_EM_16:
+	  pos[i].x_advance = (font->x_scale + ((int) space_type)/2) / (int) space_type;
+	  break;
+
+	case t::SPACE_4_EM_18:
+	  pos[i].x_advance = font->x_scale * 4 / 18;
+	  break;
+
+	case t::SPACE_FIGURE:
+	  for (char u = '0'; u <= '9'; u++)
+	    if (font->get_nominal_glyph (u, &glyph))
+	    {
+	      pos[i].x_advance = font->get_glyph_h_advance (glyph);
+	      break;
+	    }
+	  break;
+
+	case t::SPACE_PUNCTUATION:
+	  if (font->get_nominal_glyph ('.', &glyph))
+	    pos[i].x_advance = font->get_glyph_h_advance (glyph);
+	  else if (font->get_nominal_glyph (',', &glyph))
+	    pos[i].x_advance = font->get_glyph_h_advance (glyph);
+	  break;
+
+	case t::SPACE_NARROW:
+	  /* Half-space?
+	   * Unicode doc http://www.unicode.org/charts/PDF/U2000.pdf says ~1/4 or 1/5 of EM.
+	   * However, in my testing, many fonts have their regular space being about that
+	   * size.  To me, a percentage of the space width makes more sense.  Half is as
+	   * good as any. */
+	  pos[i].x_advance /= 2;
+	  break;
+      }
+    }
+}