1 files changed, 25 insertions, 8 deletions

diff --git a/thirdparty/harfbuzz/src/hb-font.hh b/thirdparty/harfbuzz/src/hb-font.hh
index 8fc7f44d44..70311b4a85 100644
--- a/thirdparty/harfbuzz/src/hb-font.hh
+++ b/thirdparty/harfbuzz/src/hb-font.hh
@@ -57,6 +57,7 @@
   HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \
   HB_FONT_FUNC_IMPLEMENT (glyph_name) \
   HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \
+  HB_FONT_FUNC_IMPLEMENT (glyph_shape) \
   /* ^--- Add new callbacks here */
 
 struct hb_font_funcs_t
@@ -109,6 +110,8 @@ struct hb_font_t
 
   int32_t x_scale;
   int32_t y_scale;
+  float slant;
+  float slant_xy;
   int64_t x_mult;
   int64_t y_mult;
 
@@ -138,6 +141,8 @@ struct hb_font_t
   hb_position_t em_scalef_y (float v) { return em_scalef (v, y_scale); }
   float em_fscale_x (int16_t v) { return em_fscale (v, x_scale); }
   float em_fscale_y (int16_t v) { return em_fscale (v, y_scale); }
+  float em_fscalef_x (float v) { return em_fscalef (v, x_scale); }
+  float em_fscalef_y (float v) { return em_fscalef (v, y_scale); }
   hb_position_t em_scale_dir (int16_t v, hb_direction_t direction)
   { return em_mult (v, dir_mult (direction)); }
 
@@ -217,9 +222,10 @@ struct hb_font_t
   }
 
   hb_bool_t get_nominal_glyph (hb_codepoint_t unicode,
-			       hb_codepoint_t *glyph)
+			       hb_codepoint_t *glyph,
+			       hb_codepoint_t not_found = 0)
   {
-    *glyph = 0;
+    *glyph = not_found;
     return klass->get.f.nominal_glyph (this, user_data,
 				       unicode, glyph,
 				       klass->user_data.nominal_glyph);
@@ -238,9 +244,10 @@ struct hb_font_t
   }
 
   hb_bool_t get_variation_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
-				 hb_codepoint_t *glyph)
+				 hb_codepoint_t *glyph,
+				 hb_codepoint_t not_found = 0)
   {
-    *glyph = 0;
+    *glyph = not_found;
     return klass->get.f.variation_glyph (this, user_data,
 					 unicode, variation_selector, glyph,
 					 klass->user_data.variation_glyph);
@@ -369,6 +376,15 @@ struct hb_font_t
 					 klass->user_data.glyph_from_name);
   }
 
+  void get_glyph_shape (hb_codepoint_t glyph,
+			hb_draw_funcs_t *draw_funcs, void *draw_data)
+  {
+    klass->get.f.glyph_shape (this, user_data,
+			      glyph,
+			      draw_funcs, draw_data,
+			      klass->user_data.glyph_shape);
+  }
+
 
   /* A bit higher-level, and with fallback */
 
@@ -615,14 +631,15 @@ struct hb_font_t
     signed upem = face->get_upem ();
     x_mult = ((int64_t) x_scale << 16) / upem;
     y_mult = ((int64_t) y_scale << 16) / upem;
+    slant_xy = y_scale ? slant * x_scale / y_scale : 0.f;
   }
 
   hb_position_t em_mult (int16_t v, int64_t mult)
-  {
-    return (hb_position_t) ((v * mult) >> 16);
-  }
+  { return (hb_position_t) ((v * mult + 32768) >> 16); }
   hb_position_t em_scalef (float v, int scale)
-  { return (hb_position_t) roundf (v * scale / face->get_upem ()); }
+  { return (hb_position_t) roundf (em_fscalef (v, scale)); }
+  float em_fscalef (float v, int scale)
+  { return v * scale / face->get_upem (); }
   float em_fscale (int16_t v, int scale)
   { return (float) v * scale / face->get_upem (); }
 };