Merge branch 'measureText'

src/CanvasRenderingContext2d.cc

@@ -89,6 +89,7 @@ Context2d::Initialize(Handle<Object> target) {
   NODE_SET_PROTOTYPE_METHOD(t, "clearRect", ClearRect);
   NODE_SET_PROTOTYPE_METHOD(t, "rect", Rect);
   NODE_SET_PROTOTYPE_METHOD(t, "setTextPath", SetTextPath);
+  NODE_SET_PROTOTYPE_METHOD(t, "measureText", MeasureText);
   NODE_SET_PROTOTYPE_METHOD(t, "moveTo", MoveTo);
   NODE_SET_PROTOTYPE_METHOD(t, "lineTo", LineTo);
   NODE_SET_PROTOTYPE_METHOD(t, "bezierCurveTo", BezierCurveTo);
@@ -843,6 +844,28 @@ Context2d::SetFont(const Arguments &args) {
   return Undefined();
 }
 
+/*
+ * Return the given text extents.
+ */
+
+Handle<Value>
+Context2d::MeasureText(const Arguments &args) {
+  HandleScope scope;
+
+  Context2d *context = ObjectWrap::Unwrap<Context2d>(args.This());
+  cairo_t *ctx = context->getContext();
+
+  String::Utf8Value str(args[0]->ToString());
+  Local<Object> obj = Object::New();
+
+  cairo_text_extents_t te;
+  cairo_text_extents(ctx, *str, &te);
+  obj->Set(String::New("width"), Number::New(te.width));
+  obj->Set(String::New("height"), Number::New(te.height));
+
+  return scope.Close(obj);
+}
+
 /*
  * Set text path at x, y.
  */

src/CanvasRenderingContext2d.h

@@ -65,6 +65,7 @@ class Context2d: public node::ObjectWrap {
     static Handle<Value> SetFillPattern(const Arguments &args);
     static Handle<Value> SetStrokePattern(const Arguments &args);
     static Handle<Value> SetTextPath(const Arguments &args);
+    static Handle<Value> MeasureText(const Arguments &args);
     static Handle<Value> BezierCurveTo(const Arguments &args);
     static Handle<Value> QuadraticCurveTo(const Arguments &args);
     static Handle<Value> LineTo(const Arguments &args);

test/canvas.test.js

@@ -747,6 +747,16 @@ module.exports = {
       , 'Context2d#strokeText()');    
   },
   
+  'test Context2d#measureText()': function(assert){
+    var canvas = new Canvas(200, 200)
+      , ctx = canvas.getContext('2d');
+    
+    ctx.font = 'normal 40px Impact';
+    assert.eql({ width: 111, height: 32 }, ctx.measureText('Wahoo'));
+    assert.eql(ctx.measureText(123), ctx.measureText('123'));
+    assert.eql(ctx.measureText(), ctx.measureText('undefined'));
+  },
+  
   'test Canvas#toBuffer()': function(assert){
     assert.ok(Buffer.isBuffer(new Canvas(200, 200).toBuffer()), 'Canvas#toBuffer() failed');
   },