[wasm] get/set font variation parameters

src/hb-wasm-api-font.hh

@@ -190,6 +190,62 @@ HB_WASM_API (void, glyph_outline_free) (HB_WASM_EXEC_ENV
   outline->contours = nullref;
 }
 
+HB_WASM_API (bool_t, font_copy_coords) (HB_WASM_EXEC_ENV
+					  ptr_d(font_t, font),
+					  ptr_d(coords_t, coords))
+{
+  HB_REF2OBJ (font);
+  HB_PTR_PARAM (coords_t, coords);
+  if (unlikely (!coords))
+    return false;
+
+  unsigned our_length;
+  const int* our_coords = hb_font_get_var_coords_normalized(font, &our_length);
+
+  if (our_length <= coords->length) {
+    int *their_coords = HB_ARRAY_APP2NATIVE (int, coords->coords, our_length);
+    if (unlikely(!their_coords)) {
+    	coords->length = 0;
+    	return false;
+    }
+		unsigned bytes = our_length * sizeof (int);
+    memcpy (their_coords, our_coords, bytes);
+
+    return true;
+  }
+
+  module_free (coords->coords);
+  coords->length = our_length;
+	unsigned bytes = our_length * sizeof (int);
+  coords->coords = wasm_runtime_module_dup_data (module_inst, (const char *) our_coords, bytes);
+	if (our_length && !coords->coords)
+	  {
+    coords->length = 0;
+    return false;
+  }
+
+  return true;
+}
+
+HB_WASM_API (bool_t, font_set_coords) (HB_WASM_EXEC_ENV
+					  ptr_d(font_t, font),
+					  ptr_d(coords_t, coords))
+{
+  HB_REF2OBJ (font);
+  HB_PTR_PARAM (coords_t, coords);
+  if (unlikely (!coords))
+    return false;
+
+  unsigned length = coords->length;
+  unsigned bytes;
+  if (unlikely (hb_unsigned_mul_overflows (length, sizeof (int), &bytes)))
+    return false;
+
+  const int *our_coords = (const int *) (validate_app_addr (coords->coords, bytes) ? addr_app_to_native (coords->coords) : nullptr);
+  hb_font_set_var_coords_normalized(font, our_coords, length);
+  return true;
+}
+
 
 }}
 

src/hb-wasm-api-list.hh

@@ -84,6 +84,8 @@ static NativeSymbol _hb_wasm_native_symbols[] =
   NATIVE_SYMBOL ("(iii)i",	font_get_glyph_extents),
   NATIVE_SYMBOL ("(ii$*)",	font_glyph_to_string),
   NATIVE_SYMBOL ("(iii)i",	font_copy_glyph_outline),
+  NATIVE_SYMBOL ("(ii)i",	font_copy_coords),
+  NATIVE_SYMBOL ("(ii)i",	font_set_coords),
 
   /* outline */
   NATIVE_SYMBOL ("(i)",		glyph_outline_free),

src/hb-wasm-api.h

@@ -233,6 +233,20 @@ HB_WASM_API (void, font_glyph_to_string) (HB_WASM_EXEC_ENV
 					  char *s, uint32_t size);
 
 
+typedef struct
+{
+  unsigned int length;
+  ptr_t(int) coords;
+} coords_t;
+
+HB_WASM_API (bool_t, font_copy_coords) (HB_WASM_EXEC_ENV
+					  ptr_d(font_t, font),
+					  ptr_d(coords_t, coords));
+
+HB_WASM_API (bool_t, font_set_coords) (HB_WASM_EXEC_ENV
+					  ptr_d(font_t, font),
+					  ptr_d(coords_t, coords));
+
 /* outline */
 
 enum glyph_outline_point_type_t