[cairo] [RFC] Add device_extents api

[Behdad Esfahbod]

Robert O'Callahan wrote:
> On Wed, Feb 4, 2009 at 8:46 AM, Behdad Esfahbod <behdad at behdad.org
> <mailto:behdad at behdad.org>> wrote:
> 
>     I see your point about stroke width.  Another option is to lock the
>     stroke pen.
> 
> 
> We need to either provide new API to do that, or change the existing API
> to do that, or adopt something like Jeff's device-space extents API. We
> need to reach consensus on the preferred solution, because this is
> causing us pain downstream:
> https://bugzilla.mozilla.org/show_bug.cgi?id=465996#c46

We're not very far from fixing the user-space extent bug. Needs someone to sit
down and pull it all together.  (stroke code needs to be duped and shaved to
give us tight stroke extents.)

behdad