[wasm-api] Implement font_get_face

src/hb-wasm-api.hh

@@ -25,7 +25,7 @@
 #ifndef HB_WASM_API_HH
 #define HB_WASM_API_HH
 
-#include "hb.h"
+#include "hb.hh"
 
 #include <wasm_export.h>
 
@@ -41,9 +41,14 @@
 #undef HB_WASM_BEGIN_DECLS
 #undef HB_WASM_END_DECLS
 
+#define module_inst wasm_runtime_get_module_inst (exec_env)
+
 
 #include "hb-wasm-font.hh"
 
+
+#undef module_inst
+
 static void debugprint(wasm_exec_env_t exec_env, char *the_string, uint8_t len) {
 	printf("%*s", len, the_string);
 }

src/hb-wasm-font.hh

@@ -33,9 +33,17 @@ namespace wasm {
 
 face_t
 font_get_face (HB_WASM_EXEC_ENV
-	       font_t)
+	       font_t fontref)
 {
-  return 0;
+  hb_font_t *font;
+  if (unlikely (!wasm_externref_ref2obj (fontref, (void **) &font)))
+    return 0;
+
+  hb_face_t *face = hb_font_get_face (font);
+
+  uint32_t faceref = 0;
+  (void) wasm_externref_obj2ref (module_inst, face, &faceref);
+  return faceref;
 }