Re: Thoughts about a new GdkPixbuf transform interface

[Oleg Klimov <quif land ru>]

Matthias Clasen wrote:
> > | dest_x |   | offset_x |     | m00 m01 | | src_x |
> > | dest_y | = | offset_y |  +  | m10 m11 |*| src_y |
> >   
> Yes, this is exactly what affine is. It can be represented a bit more neatly
> as
>
> |dst_x|   | offset_x m00 m01 |   | 1     |
> |dst_y| = | offset_y m10 m11 | * | src_x |
>                                  | src_y |
Thanks :-)
M-m-m...
It is a bunch of numbers anyway... I hope most people understand if we
give any
of this formulas in the docs.
> Actually, I would personally love to see this extended to projective
> transformations by extending the matrix to a 3x3 matrix.
We'll need 4x4 matrix for 3d transformation if we want to have offset
included :-)
> >  - "render", "do the transform", then why we need any more arguments? 
> >   
> They select the rectangle which actually gets rendered.
Useless for me, not necessary useless for everyone...
> > What's this?!
> > Absolutly no idea what this is all _about_.
> >   
> See section 9 of the Xrender specification for this:
> http://cvsweb.xfree86.org/cvsweb/~checkout~/xc/doc/specs/Render/protocol?rev=1.7&content-type=text/plain
Thanks. Intresting read.

M-m-m... I think I've just got annoyed because Owen took my patches (I
spent much time writing it)
and here is the original message :-(

If someone want to see transformation working, grab patches from
http://bugzilla.gnome.org/show_bug.cgi?id=105794
(apply to 2.2.1 or compile separately with hand-written Makefile,
whatever you think faster/better)
Three demos included (rotating sprite, tank, locomotion)

Someone want me to replace my gdouble[4] + parameters to
GdkPixbufTransform object and post
patches again? I can also contribute lines/arcs/polygons drawing, and
(after thinking for
a while) clipping region.