Implemented shadow coloring

src/CanvasRenderingContext2d.cc

@@ -1052,21 +1052,18 @@ Context2d::FillRect(const Arguments &args) {
     return Undefined();
   }
 
+  cairo_save(ctx);
   cairo_translate(
       ctx
     , context->state->shadowOffsetX
     , context->state->shadowOffsetY);
 
   cairo_rectangle(ctx, x, y, width, height);
-  SET_SOURCE(context->state->fill);
+  SET_SOURCE_RGBA(context->state->shadow);
   cairo_fill(ctx);
   Canvas::blur(context->getCanvas()->getSurface(), context->state->shadowBlur);
 
-  cairo_translate(
+  cairo_restore(ctx);
-      ctx
-    , -context->state->shadowOffsetX
-    , -context->state->shadowOffsetY);
-  
   context->restorePath();
   cairo_fill(ctx);
   return Undefined();

src/CanvasRenderingContext2d.h

@@ -100,7 +100,7 @@ class Context2d: public node::ObjectWrap {
     static void SetShadowBlur(Local<String> prop, Local<Value> val, const AccessorInfo &info);
     inline cairo_t *getContext(){ return _context; }
     inline Canvas *getCanvas(){ return _canvas; }
-    bool hasShadow();
+    inline bool hasShadow();
     void setTextPath(const char *str, double x, double y);
     void savePath();
     void restorePath();