Record the initial matrix when we begin picture-playback, and concat with

Record the initial matrix when we begin picture-playback, and concat with
that if we see a setMatrix command. In this way we can respect the caller's
overall playback matrix environment.
Committed: https://code.google.com/p/skia/source/detail?r=5409

[reed1, 2012-09-05 20:55:57]

I think we can also do something about drawSprite in the picture case, but that
will probably be a different CL.

Also wondering if we can/should enforce any master-clip constraints from the
caller, in the case where the picture contains clip-smashing ops like Replace or
Union...

[bsalomon, 2012-09-05 21:03:22]

LGTM

On 2012/09/05 20:55:57, reed1 wrote:
> I think we can also do something about drawSprite in the picture case, but
that
> will probably be a different CL.
> 
> Also wondering if we can/should enforce any master-clip constraints from the
> caller, in the case where the picture contains clip-smashing ops like Replace
or
> Union...

I think it makes the API cleaner if we did. But it gets back to the clip parens
idea we discussed the other day. We'd want to take the resolved original
resolved clip and intersect with the picture's current resolved clip. 

In the current implementation every op except diff and intersect can open up
areas of the device that were clipped out before playback.