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Showing content from http://libvips.github.io/libvips/API/current/method.Image.quadratic.html below:

Vips.Image.quadratic

int
vips_quadratic (
  VipsImage* in,
  VipsImage** out,
  VipsImage* coeff,
  ...
)

Transform an image with a 0, 1, 2, or 3rd order polynomial.

The transform we compute:

x = x' + a              : order 0     image shift only
  + b x' + c y'         : order 1     + affine transf.
  + d x' y'             : order 2     + bilinear transf.
  + e x' x' + f y' y'   : order 3     + quadratic transf.

y = y' + g
  + h y' + i x'
  + j y' x'
  + k y' y' + l x' x'

where:

x', y' = coordinates of srcim
x, y   = coordinates of dstim
a .. l = coefficients

The coefficients are in the input matrix, ordered as:

a g
--
b h
c i
--
d j
--
e k
f l

The matrix height may be 1, 3, 4, 6

Optional arguments

• interpolate: VipsInterpolate, use this interpolator (default bilinear)

This method is not directly available to language bindings.

out

Type: VipsImage

Output image.

The argument will be set by the function. The caller of the method takes ownership of the returned data, and is responsible for freeing it.

coeff

Type: VipsImage

Horizontal quadratic.

The data is owned by the caller of the method.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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