On Tue, 14 May 2013 12:48:39 -0700 Bill Spitzak <spit...@gmail.com> wrote:
> Pekka Paalanen wrote: > > > You cannot get an identity by multiplying real-valued transformations > > together, other than by accident. > > This is why I propose sending the inverse of the matrix, so the identity > can be checked accurately. It also happens that the inverse matrix is > the same matrix that is needed to tell cairo to draw the image correctly. > A matrix naively multiplied by its inverse matrix is not identity, so you cannot simply check it. Also, checking whether two matrices are equal is *hard*. Do not go there. This proposal does not belong in this thread. Really. - pq _______________________________________________ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel
