[Backend] Add async method waitVSync()

src/backend/Backend.cc

@@ -1,6 +1,29 @@
 #include "Backend.h"
 
 
+using Nan::AsyncQueueWorker;
+using Nan::AsyncWorker;
+using Nan::Callback;
+
+
+class WaitVSync: public AsyncWorker
+{
+  public:
+    WaitVSync(Callback* callback, Backend* backend)
+      : AsyncWorker(callback, "Backend:WaitVSync")
+      , backend(backend)
+    {}
+
+    void Execute()
+    {
+      backend->waitVSync();
+    }
+
+  private:
+    Backend* backend;
+};
+
+
 Backend::Backend(string name, int width, int height)
   : name(name)
   , width(width)
@@ -97,6 +120,21 @@ bool Backend::isSurfaceValid(){
 }
 
 
+NAN_METHOD(Backend::waitVSync)
+{
+  Backend* backend = Nan::ObjectWrap::Unwrap<Backend>(info.This());
+
+  Callback* callback = new Callback(info[0].As<v8::Function>());
+
+  AsyncQueueWorker(new WaitVSync(callback, backend));
+}
+
+void Backend::Initialize(Local<FunctionTemplate> ctor)
+{
+	Nan::SetPrototypeMethod(ctor, "waitVSync", waitVSync);
+}
+
+
 BackendOperationNotAvailable::BackendOperationNotAvailable(Backend* backend,
   string operation_name)
   : backend(backend)

src/backend/Backend.h

@@ -15,13 +15,19 @@
 class Canvas;
 
 using namespace std;
+using namespace v8;
+
 
 class Backend : public Nan::ObjectWrap
 {
+  friend class WaitVSync;
+
   private:
     const string name;
     const char* error = NULL;
 
+    virtual void waitVSync(){};
+
   protected:
     int width;
     int height;
@@ -31,6 +37,7 @@ class Backend : public Nan::ObjectWrap
     Backend(string name, int width, int height);
     static void init(const Nan::FunctionCallbackInfo<v8::Value> &info);
     static Backend *construct(int width, int height){ return nullptr; }
+    static void Initialize(Local<FunctionTemplate> ctor);
 
   public:
     virtual ~Backend();
@@ -58,6 +65,8 @@ class Backend : public Nan::ObjectWrap
 
     bool isSurfaceValid();
     inline const char* getError(){ return error; }
+
+    static NAN_METHOD(waitVSync);
 };