Add backgroundSize property

framer/Layer.coffee

@@ -355,6 +355,8 @@ class exports.Layer extends BaseClass
 	@define "backgroundGrayscale", layerProperty(@, "backgroundGrayscale", "webkitBackdropFilter", 0, _.isNumber)
 	@define "backgroundSepia", layerProperty(@, "backgroundSepia", "webkitBackdropFilter", 0, _.isNumber)
 
+	@define "backgroundSize", layerProperty(@, "backgroundSize", "backgroundSize", null, _.isString)
+
 	for i in [0..8]
 		do (i) =>
 			@define "shadow#{i+1}",

framer/LayerStyle.coffee

@@ -243,6 +243,14 @@ exports.LayerStyle =
 	backgroundColor: (layer) ->
 		return layer._properties.backgroundColor
 
+	backgroundSize: (layer) ->
+		switch layer._properties.backgroundSize
+			when "fill" then return "cover"
+			when "fit" then return "contain"
+			when "stretch" then return "100% 100%"
+		return layer._properties.backgroundSize
+
+
 	fill: (layer) ->
 		return layer._properties.fill
 

test/tests/LayerTest.coffee

@@ -378,6 +378,37 @@ describe "Layer", ->
 			layer.image = imagePath
 			layer.backgroundColor.should.equalColor "red"
 
+		describe "should set the background size", ->
+			it "cover", ->
+				layer = new Layer backgroundSize: "cover"
+				layer.style["background-size"].should.equal "cover"
+
+			it "contain", ->
+				layer = new Layer backgroundSize: "contain"
+				layer.style["background-size"].should.equal "contain"
+
+			it "percentage", ->
+				layer = new Layer backgroundSize: "100%"
+				layer.style["background-size"].should.equal "100%"
+
+			it "other", ->
+				layer = new Layer backgroundSize: "300px, 5em 10%"
+				layer.style["background-size"].should.equal "300px, 5em 10%"
+
+			it "fill", ->
+				layer = new Layer backgroundSize: "fill"
+				layer.style["background-size"].should.equal "cover"
+
+			it "fit", ->
+				layer = new Layer backgroundSize: "fit"
+				layer.style["background-size"].should.equal "contain"
+
+			it "stretch", ->
+				layer = new Layer backgroundSize: "stretch"
+				# This should be "100% 100%", but phantomjs doest return that when you set it
+				layer.style["background-size"].should.equal "100%"
+
+
 		it "should set visible", ->
 
 			layer = new Layer