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vendor/code.google.com/p/graphics-go/graphics/interp/doc.go

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+// 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 implements image interpolation.
+
+An interpolator provides the Interp interface, which can be used
+to interpolate a pixel:
+
+  c := interp.Bilinear.Interp(src, 1.2, 1.8)
+
+To interpolate a large number of RGBA or Gray pixels, an implementation
+may provide a fast-path by implementing the RGBA or Gray interfaces.
+
+	i1, ok := i.(interp.RGBA)
+	if ok {
+		c := i1.RGBA(src, 1.2, 1.8)
+		// use c.R, c.G, etc
+		return
+	}
+	c := i.Interp(src, 1.2, 1.8)
+	// use generic color.Color
+*/
+package interp