Re: Image transformations

[Eli Zaretskii]

> From: Richard Copley <address@hidden>
> Date: Thu, 13 Jun 2019 20:00:49 +0100
> Cc: Alp Aker <address@hidden>, address@hidden, 
>       Emacs Development <address@hidden>
> 
> XRender uses homogeneous matrices. In this system a 3x3 projective matrix can
> represent any affine transformation as one matrix. The matrix representing a
> translation, then a rotation, then a translation, can then be calculated by
> multiplying three matrices. (It is in fact again a rotation followed by a 
> single
> translation.)

Thanks for a useful and detailed description.