[cairo] [PATCH] add extents to clone_similar

[Christopher "Monty" Montgomery]

On 10/5/06, Owen Taylor <otaylor at redhat.com> wrote:
> On Thu, 2006-10-05 at 13:15 -0400, Christopher "Monty" Montgomery wrote:
> > Hi Carl,
> >
> > The promised patch from yesterday's discussion.  Add extent hints to
> > the various backends' clone_similar methods in order to avoid
> > complete-surface copies into the X server from small image fills.
>
> This is about the case where:
>
>  - You have a large image surface
>  - You want to draw a small portion of it onto an Xlib surface

Bingo.  Any case where a portion of an image surface is blitted to an
xlib surface, although it obviously matters most for large ones.

BTW, are there any internal situations where that would happen?  Are
xlib surfaces also pulled back and forth to images in other cases,
such as blending without XRENDER?

Monty