bicubic

Bicubic interpolation - traditionally used for scaling up images or heightmaps.

Usage

bicubic(x, y, values...)

x and y are two values between 0 and 1 that determine the point of interpolation. These are followed by a remaining 16 arguments, each of which represent the value of a neighboring point. They're specified in this order:

• point(0, 0)
• point(0, 1)
• point(0, 2)
• point(0, 3)
• point(1, 0)
• point(1, 1)
• point(1, 2)
• point(1, 3)
• point(2, 0)
• point(2, 1)
• point(2, 2)
• point(2, 3)
• point(3, 0)
• point(3, 1)
• point(3, 2)
• point(3, 3)

This obviously isn't the most intuitive API, so you can use bicubic-sample to get something a little friendlier.

License

MIT. See LICENSE.md for details.