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diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/interp.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/interp.go
new file mode 100644
index 000000000..560637d4a
--- /dev/null
+++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/interp.go
@@ -0,0 +1,29 @@
+// Copyright 2012 The Graphics-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package interp
+
+import (
+	"image"
+	"image/color"
+)
+
+// Interp interpolates an image's color at fractional co-ordinates.
+type Interp interface {
+	// Interp interpolates (x, y).
+	Interp(src image.Image, x, y float64) color.Color
+}
+
+// RGBA is a fast-path interpolation implementation for image.RGBA.
+// It is common for an Interp to also implement RGBA.
+type RGBA interface {
+	// RGBA interpolates (x, y).
+	RGBA(src *image.RGBA, x, y float64) color.RGBA
+}
+
+// Gray is a fast-path interpolation implementation for image.Gray.
+type Gray interface {
+	// Gray interpolates (x, y).
+	Gray(src *image.Gray, x, y float64) color.Gray
+}