[API] One last font-funcs API change

Now that vertical text works correctly, I'm doing a last round
modification of the font-funcs API to simplify.  Expect no more
changes around here.

src/hb-font.cc

@@ -56,40 +56,28 @@ hb_font_get_glyph_nil (hb_font_t *font HB_UNUSED,
   return FALSE;
 }
 
-static void
+static hb_position_t
 hb_font_get_glyph_h_advance_nil (hb_font_t *font HB_UNUSED,
 				 void *font_data HB_UNUSED,
 				 hb_codepoint_t glyph,
-				 hb_position_t *advance,
 				 void *user_data HB_UNUSED)
 {
-  if (font->parent) {
-    hb_font_get_glyph_h_advance (font->parent,
-				 glyph,
-				 advance);
-    *advance = font->parent_scale_x_distance (*advance);
-    return;
-  }
+  if (font->parent)
+    return font->parent_scale_x_distance (hb_font_get_glyph_h_advance (font->parent, glyph));
 
-  *advance = font->x_scale;
+  return font->x_scale;
 }
 
-static void
+static hb_position_t
 hb_font_get_glyph_v_advance_nil (hb_font_t *font HB_UNUSED,
 				 void *font_data HB_UNUSED,
 				 hb_codepoint_t glyph,
-				 hb_position_t *advance,
 				 void *user_data HB_UNUSED)
 {
-  if (font->parent) {
-    hb_font_get_glyph_v_advance (font->parent,
-				 glyph,
-				 advance);
-    *advance = font->parent_scale_y_distance (*advance);
-    return;
-  }
+  if (font->parent)
+    return font->parent_scale_y_distance (hb_font_get_glyph_v_advance (font->parent, glyph));
 
-  *advance = font->y_scale;
+  return font->y_scale;
 }
 
 static hb_bool_t
@@ -134,42 +122,30 @@ hb_font_get_glyph_v_origin_nil (hb_font_t *font HB_UNUSED,
   return FALSE;
 }
 
-static void
+static hb_position_t
 hb_font_get_glyph_h_kerning_nil (hb_font_t *font HB_UNUSED,
 				 void *font_data HB_UNUSED,
 				 hb_codepoint_t left_glyph,
 				 hb_codepoint_t right_glyph,
-				 hb_position_t *kerning,
 				 void *user_data HB_UNUSED)
 {
-  if (font->parent) {
-    hb_font_get_glyph_h_kerning (font->parent,
-				 left_glyph, right_glyph,
-				 kerning);
-    *kerning = font->parent_scale_x_distance (*kerning);
-    return;
-  }
+  if (font->parent)
+    return font->parent_scale_x_distance (hb_font_get_glyph_h_kerning (font->parent, left_glyph, right_glyph));
 
-  *kerning = 0;
+  return 0;
 }
 
-static void
+static hb_position_t
 hb_font_get_glyph_v_kerning_nil (hb_font_t *font HB_UNUSED,
 				 void *font_data HB_UNUSED,
 				 hb_codepoint_t top_glyph,
 				 hb_codepoint_t bottom_glyph,
-				 hb_position_t *kerning,
 				 void *user_data HB_UNUSED)
 {
-  if (font->parent) {
-    hb_font_get_glyph_v_kerning (font->parent,
-				 top_glyph, bottom_glyph,
-				 kerning);
-    *kerning = font->parent_scale_y_distance (*kerning);
-    return;
-  }
+  if (font->parent)
+    return font->parent_scale_y_distance (hb_font_get_glyph_v_kerning (font->parent, top_glyph, bottom_glyph));
 
-  *kerning = 0;
+  return 0;
 }
 
 static hb_bool_t
@@ -340,26 +316,22 @@ hb_font_get_glyph (hb_font_t *font,
 				 font->klass->user_data.glyph);
 }
 
-void
+hb_position_t
 hb_font_get_glyph_h_advance (hb_font_t *font,
-			     hb_codepoint_t glyph,
-			     hb_position_t *advance)
+			     hb_codepoint_t glyph)
 {
-  *advance = 0;
-  font->klass->get.glyph_h_advance (font, font->user_data,
-				    glyph, advance,
-				    font->klass->user_data.glyph_h_advance);
+  return font->klass->get.glyph_h_advance (font, font->user_data,
+					   glyph,
+					   font->klass->user_data.glyph_h_advance);
 }
 
-void
+hb_position_t
 hb_font_get_glyph_v_advance (hb_font_t *font,
-			     hb_codepoint_t glyph,
-			     hb_position_t *advance)
+			     hb_codepoint_t glyph)
 {
-  *advance = 0;
-  font->klass->get.glyph_v_advance (font, font->user_data,
-				    glyph, advance,
-				    font->klass->user_data.glyph_v_advance);
+  return font->klass->get.glyph_v_advance (font, font->user_data,
+					   glyph,
+					   font->klass->user_data.glyph_v_advance);
 }
 
 hb_bool_t
@@ -384,27 +356,21 @@ hb_font_get_glyph_v_origin (hb_font_t *font,
 					   font->klass->user_data.glyph_v_origin);
 }
 
-void
+hb_position_t
 hb_font_get_glyph_h_kerning (hb_font_t *font,
-			     hb_codepoint_t left_glyph, hb_codepoint_t right_glyph,
-			     hb_position_t *kerning)
+			     hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
 {
-  *kerning = 0;
   return font->klass->get.glyph_h_kerning (font, font->user_data,
 					   left_glyph, right_glyph,
-					   kerning,
 					   font->klass->user_data.glyph_h_kerning);
 }
 
-void
+hb_position_t
 hb_font_get_glyph_v_kerning (hb_font_t *font,
-			     hb_codepoint_t left_glyph, hb_codepoint_t right_glyph,
-			     hb_position_t *kerning)
+			     hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
 {
-  *kerning = 0;
   return font->klass->get.glyph_v_kerning (font, font->user_data,
 				     left_glyph, right_glyph,
-				     kerning,
 				     font->klass->user_data.glyph_v_kerning);
 }
 
@@ -442,11 +408,11 @@ hb_font_get_glyph_advance_for_direction (hb_font_t *font,
 					 hb_position_t *x, hb_position_t *y)
 {
   if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
+    *x = hb_font_get_glyph_h_advance (font, glyph);
     *y = 0;
-    hb_font_get_glyph_h_advance (font, glyph, x);
   } else {
     *x = 0;
-    hb_font_get_glyph_v_advance (font, glyph, y);
+    *y = hb_font_get_glyph_v_advance (font, glyph);
   }
 }
 
@@ -455,10 +421,7 @@ guess_v_origin_minus_h_origin (hb_font_t *font,
 			       hb_codepoint_t glyph,
 			       hb_position_t *x, hb_position_t *y)
 {
-  *x = *y = 0;
-
-  hb_font_get_glyph_h_advance (font, glyph, x);
-  *x /= 2;
+  *x = hb_font_get_glyph_h_advance (font, glyph) / 2;
 
   /* TODO use font_metics.ascent */
   *y = font->y_scale;
@@ -523,11 +486,11 @@ hb_font_get_glyph_kerning_for_direction (hb_font_t *font,
 					 hb_position_t *x, hb_position_t *y)
 {
   if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
+    *x = hb_font_get_glyph_h_kerning (font, first_glyph, second_glyph);
     *y = 0;
-     hb_font_get_glyph_h_kerning (font, first_glyph, second_glyph, x);
   } else {
     *x = 0;
-     hb_font_get_glyph_v_kerning (font, first_glyph, second_glyph, y);
+    *y = hb_font_get_glyph_v_kerning (font, first_glyph, second_glyph);
   }
 }
 

src/hb-font.h

@@ -142,10 +142,9 @@ typedef hb_bool_t (*hb_font_get_glyph_func_t) (hb_font_t *font, void *font_data,
 					       void *user_data);
 
 
-typedef void (*hb_font_get_glyph_advance_func_t) (hb_font_t *font, void *font_data,
-						  hb_codepoint_t glyph,
-						  hb_position_t *advance,
-						  void *user_data);
+typedef hb_position_t (*hb_font_get_glyph_advance_func_t) (hb_font_t *font, void *font_data,
+							   hb_codepoint_t glyph,
+							   void *user_data);
 typedef hb_font_get_glyph_advance_func_t hb_font_get_glyph_h_advance_func_t;
 typedef hb_font_get_glyph_advance_func_t hb_font_get_glyph_v_advance_func_t;
 
@@ -156,10 +155,9 @@ typedef hb_bool_t (*hb_font_get_glyph_origin_func_t) (hb_font_t *font, void *fon
 typedef hb_font_get_glyph_origin_func_t hb_font_get_glyph_h_origin_func_t;
 typedef hb_font_get_glyph_origin_func_t hb_font_get_glyph_v_origin_func_t;
 
-typedef void (*hb_font_get_glyph_kerning_func_t) (hb_font_t *font, void *font_data,
-						  hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
-						  hb_position_t *kerning,
-						  void *user_data);
+typedef hb_position_t (*hb_font_get_glyph_kerning_func_t) (hb_font_t *font, void *font_data,
+							   hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
+							   void *user_data);
 typedef hb_font_get_glyph_kerning_func_t hb_font_get_glyph_h_kerning_func_t;
 typedef hb_font_get_glyph_kerning_func_t hb_font_get_glyph_v_kerning_func_t;
 
@@ -183,38 +181,38 @@ hb_font_funcs_set_glyph_func (hb_font_funcs_t *ffuncs,
 
 void
 hb_font_funcs_set_glyph_h_advance_func (hb_font_funcs_t *ffuncs,
-					hb_font_get_glyph_h_advance_func_t glyph_advance_func,
+					hb_font_get_glyph_h_advance_func_t func,
 					void *user_data, hb_destroy_func_t destroy);
 void
 hb_font_funcs_set_glyph_v_advance_func (hb_font_funcs_t *ffuncs,
-					hb_font_get_glyph_v_advance_func_t glyph_advance_func,
+					hb_font_get_glyph_v_advance_func_t func,
 					void *user_data, hb_destroy_func_t destroy);
 
 void
 hb_font_funcs_set_glyph_h_origin_func (hb_font_funcs_t *ffuncs,
-				       hb_font_get_glyph_h_origin_func_t glyph_advance_func,
+				       hb_font_get_glyph_h_origin_func_t func,
 				       void *user_data, hb_destroy_func_t destroy);
 void
 hb_font_funcs_set_glyph_v_origin_func (hb_font_funcs_t *ffuncs,
-				       hb_font_get_glyph_v_origin_func_t glyph_advance_func,
+				       hb_font_get_glyph_v_origin_func_t func,
 				       void *user_data, hb_destroy_func_t destroy);
 
 void
 hb_font_funcs_set_glyph_h_kerning_func (hb_font_funcs_t *ffuncs,
-					hb_font_get_glyph_h_kerning_func_t kerning_func,
+					hb_font_get_glyph_h_kerning_func_t func,
 					void *user_data, hb_destroy_func_t destroy);
 void
 hb_font_funcs_set_glyph_v_kerning_func (hb_font_funcs_t *ffuncs,
-					hb_font_get_glyph_v_kerning_func_t kerning_func,
+					hb_font_get_glyph_v_kerning_func_t func,
 					void *user_data, hb_destroy_func_t destroy);
 
 void
 hb_font_funcs_set_glyph_extents_func (hb_font_funcs_t *ffuncs,
-				      hb_font_get_glyph_extents_func_t glyph_extents_func,
+				      hb_font_get_glyph_extents_func_t func,
 				      void *user_data, hb_destroy_func_t destroy);
 void
 hb_font_funcs_set_glyph_contour_point_func (hb_font_funcs_t *ffuncs,
-					    hb_font_get_glyph_contour_point_func_t glyph_contour_point_func,
+					    hb_font_get_glyph_contour_point_func_t func,
 					    void *user_data, hb_destroy_func_t destroy);
 
 
@@ -225,14 +223,12 @@ hb_font_get_glyph (hb_font_t *font,
 		   hb_codepoint_t unicode, hb_codepoint_t variation_selector,
 		   hb_codepoint_t *glyph);
 
-void
+hb_position_t
 hb_font_get_glyph_h_advance (hb_font_t *font,
-			     hb_codepoint_t glyph,
-			     hb_position_t *advance);
-void
+			     hb_codepoint_t glyph);
+hb_position_t
 hb_font_get_glyph_v_advance (hb_font_t *font,
-			     hb_codepoint_t glyph,
-			     hb_position_t *advance);
+			     hb_codepoint_t glyph);
 
 hb_bool_t
 hb_font_get_glyph_h_origin (hb_font_t *font,
@@ -243,14 +239,12 @@ hb_font_get_glyph_v_origin (hb_font_t *font,
 			    hb_codepoint_t glyph,
 			    hb_position_t *x, hb_position_t *y);
 
-void
+hb_position_t
 hb_font_get_glyph_h_kerning (hb_font_t *font,
-			     hb_codepoint_t left_glyph, hb_codepoint_t right_glyph,
-			     hb_position_t *kerning);
-void
+			     hb_codepoint_t left_glyph, hb_codepoint_t right_glyph);
+hb_position_t
 hb_font_get_glyph_v_kerning (hb_font_t *font,
-			     hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph,
-			     hb_position_t *kerning);
+			     hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph);
 
 hb_bool_t
 hb_font_get_glyph_extents (hb_font_t *font,

src/hb-ft.cc

@@ -78,38 +78,36 @@ hb_ft_get_glyph (hb_font_t *font HB_UNUSED,
   return *glyph != 0;
 }
 
-static void
+static hb_position_t
 hb_ft_get_glyph_h_advance (hb_font_t *font HB_UNUSED,
 			   void *font_data,
 			   hb_codepoint_t glyph,
-			   hb_position_t *advance,
 			   void *user_data HB_UNUSED)
 {
   FT_Face ft_face = (FT_Face) font_data;
   int load_flags = FT_LOAD_DEFAULT;
 
   if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
-    return;
+    return 0;
 
-  *advance = ft_face->glyph->metrics.horiAdvance;
+  return ft_face->glyph->metrics.horiAdvance;
 }
 
-static void
+static hb_position_t
 hb_ft_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
 			   void *font_data,
 			   hb_codepoint_t glyph,
-			   hb_position_t *advance,
 			   void *user_data HB_UNUSED)
 {
   FT_Face ft_face = (FT_Face) font_data;
   int load_flags = FT_LOAD_DEFAULT;
 
   if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
-    return;
+    return 0;
 
   /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates
    * have a Y growing upward.  Hence the extra negation. */
-  *advance = -ft_face->glyph->metrics.vertAdvance;
+  return -ft_face->glyph->metrics.vertAdvance;
 }
 
 static hb_bool_t
@@ -146,33 +144,31 @@ hb_ft_get_glyph_v_origin (hb_font_t *font HB_UNUSED,
   return TRUE;
 }
 
-static void
+static hb_position_t
 hb_ft_get_glyph_h_kerning (hb_font_t *font HB_UNUSED,
 			   void *font_data,
 			   hb_codepoint_t left_glyph,
 			   hb_codepoint_t right_glyph,
-			   hb_position_t *kerning,
 			   void *user_data HB_UNUSED)
 {
   FT_Face ft_face = (FT_Face) font_data;
   FT_Vector kerningv;
 
   if (FT_Get_Kerning (ft_face, left_glyph, right_glyph, FT_KERNING_DEFAULT, &kerningv))
-    return;
+    return 0;
 
-  *kerning = kerningv.x;
+  return kerningv.x;
 }
 
-static void
+static hb_position_t
 hb_ft_get_glyph_v_kerning (hb_font_t *font HB_UNUSED,
 			   void *font_data HB_UNUSED,
 			   hb_codepoint_t top_glyph HB_UNUSED,
 			   hb_codepoint_t bottom_glyph HB_UNUSED,
-			   hb_position_t *kerning HB_UNUSED,
 			   void *user_data HB_UNUSED)
 {
   /* FreeType API doesn't support vertical kerning */
-  return;
+  return 0;
 }
 
 static hb_bool_t

test/test-font.c

@@ -121,8 +121,7 @@ _test_font_nil_funcs (hb_font_t *font)
   g_assert_cmpint (x, ==, 0);
   g_assert_cmpint (y, ==, 0);
 
-  x = 13;
-  hb_font_get_glyph_h_advance (font, 17, &x);
+  x = hb_font_get_glyph_h_advance (font, 17);
   g_assert_cmpint (x, ==, 0);
 
   extents.x_bearing = extents.y_bearing = 13;
@@ -138,7 +137,7 @@ _test_font_nil_funcs (hb_font_t *font)
   g_assert_cmpint (glyph, ==, 0);
 
   x = 13;
-  hb_font_get_glyph_h_kerning (font, 17, 19, &x);
+  x = hb_font_get_glyph_h_kerning (font, 17, 19);
   g_assert_cmpint (x, ==, 0);
 }
 
@@ -236,15 +235,15 @@ contour_point_func2 (hb_font_t *font, void *font_data,
 					  glyph, point_index, x, y);
 }
 
-static void
+static hb_position_t
 glyph_h_advance_func1 (hb_font_t *font, void *font_data,
 		       hb_codepoint_t glyph,
-		       hb_position_t *advance,
 		       void *user_data)
 {
-  if (glyph == 1) {
-    *advance = 8;
-  }
+  if (glyph == 1)
+    return 8;
+
+  return 0;
 }
 
 static void
@@ -287,9 +286,9 @@ test_fontfuncs_subclassing (void)
   g_assert (!hb_font_get_glyph_contour_point_for_origin (font1, 3, 7, HB_DIRECTION_RTL, &x, &y));
   g_assert_cmpint (x, ==, 0);
   g_assert_cmpint (y, ==, 0);
-  hb_font_get_glyph_h_advance (font1, 1, &x);
+  x = hb_font_get_glyph_h_advance (font1, 1);
   g_assert_cmpint (x, ==, 8);
-  hb_font_get_glyph_h_advance (font1, 2, &x);
+  x = hb_font_get_glyph_h_advance (font1, 2);
   g_assert_cmpint (x, ==, 0);
 
 
@@ -313,9 +312,9 @@ test_fontfuncs_subclassing (void)
   g_assert (!hb_font_get_glyph_contour_point_for_origin (font2, 3, 7, HB_DIRECTION_LTR, &x, &y));
   g_assert_cmpint (x, ==, 0);
   g_assert_cmpint (y, ==, 0);
-  hb_font_get_glyph_h_advance (font2, 1, &x);
+  x = hb_font_get_glyph_h_advance (font2, 1);
   g_assert_cmpint (x, ==, 8);
-  hb_font_get_glyph_h_advance (font2, 2, &x);
+  x = hb_font_get_glyph_h_advance (font2, 2);
   g_assert_cmpint (x, ==, 0);
 
 
@@ -336,9 +335,9 @@ test_fontfuncs_subclassing (void)
   g_assert (!hb_font_get_glyph_contour_point_for_origin (font3, 3, 7, HB_DIRECTION_LTR, &x, &y));
   g_assert_cmpint (x, ==, 0*2);
   g_assert_cmpint (y, ==, 0*3);
-  hb_font_get_glyph_h_advance (font3, 1, &x);
+  x = hb_font_get_glyph_h_advance (font3, 1);
   g_assert_cmpint (x, ==, 8*2);
-  hb_font_get_glyph_h_advance (font3, 2, &x);
+  x = hb_font_get_glyph_h_advance (font3, 2);
   g_assert_cmpint (x, ==, 0*2);
 
 

test/test-shape.c

@@ -37,17 +37,17 @@
 
 static const char test_data[] = "test\0data";
 
-static void
+static hb_position_t
 glyph_h_advance_func (hb_font_t *font, void *font_data,
 		      hb_codepoint_t glyph,
-		      hb_position_t *advance,
 		      void *user_data)
 {
   switch (glyph) {
-  case 1: *advance = 10; return;
-  case 2: *advance =  6; return;
-  case 3: *advance =  5; return;
+  case 1: return 10;
+  case 2: return 6;
+  case 3: return 5;
   }
+  return 0;
 }
 
 static hb_bool_t
@@ -61,19 +61,18 @@ glyph_func (hb_font_t *font, void *font_data,
   case 'e': *glyph = 2; return TRUE;
   case 's': *glyph = 3; return TRUE;
   }
-
   return FALSE;
 }
 
-static void
+static hb_position_t
 glyph_h_kerning_func (hb_font_t *font, void *font_data,
 		      hb_codepoint_t left, hb_codepoint_t right,
-		      hb_position_t *kerning,
 		      void *user_data)
 {
-  if (left == 1 && right == 2) {
-    *kerning = -2;
-  }
+  if (left == 1 && right == 2)
+    return -2;
+
+  return 0;
 }
 
 static const char TesT[] = "TesT";