quad - quadrilateral transform (split from New Utils thread due to bug report)

[wonkey_monkey]

2019-01-14: quad is now superseded by warp

Download: quad.zip

Last update: 2012-09-30 - ~10% speed increase, bicubic interpolation
Last update: 2012-10-02 - another ~10% speed increase
Last update: 2012-10-05 - 100% speed increase!
Last update: 2012-11-01 - output levels bugfix

quad is a quadrilateral transformation filter similar to vcmohan's reform, although (so far) quad doesn't crash and does a true quadrilateral transformation. It uses bicubic interpolation (can be switched off for speed purposes) and is multi-threaded.

Minimum parameter requirements are 4 x,y pairs defining the corners of the target quadrilateral. The source quadrilateral can also be specified, if required.

No source, sorry - it makes use of too many half-written libraries scattered around my hard drive.

quad
====

An Avisynth plugin to perform quadrilateral transformations.

Usage
=====

quad(clip, tx0,ty0, tx1,tx1, tx2,ty2, tx3,ty3, [sx0,sy0, sx1,sy1, tx2,ty2, tx3,ty3, bool invert, bool normal, bool draft])

Parameters:
-----------

tx0,ty0-tx3,ty3: the four corners of the target quadrilateral.
sx0,sy0-sx3,sy3: the four corners of the source quadrilateral (default: clip's corners, clockwise from top left)
invert: invert the transformation (transpose t and s)
normal: specify that the coordinates are normalised to the range 0-1.
draft: don't use spline16 interpolation