[cairo] [patch] enable projective transformations

[Arjen Nienhuis]

On Tue, Aug 17, 2010 at 1:32 PM, Maarten Bosmans <mkbosmans at gmail.com> wrote:
> 2010/8/17 Arjen Nienhuis <a.g.nienhuis at gmail.com>:
>> I'm saying:
>>
>> I have this use case. I think it needs rotate_y and translate_z. I
>> think it needs 4x3 transforms.
>
> How is translate_z different from uniform scaling in the context of
> cairo's operations?
> I'm not sure I can follow you.
>

If there is a matrix transform the z-axis might point in a different
direction. In this use case the buttons will be translated on the
x-axis for w2 because w2 is slightly rotated along the y-axis.