Implement support for a Context parameter in image filters

Implement support for a Context parameter in image filters

Some upcoming work (support for expanding crop rects) requires
the clip bounds to be available during filter traversal. This change
replaces the SkMatrix parameter in the onFilterImage() traversals
with a Context parameter. It contains the CTM, as well as the clip
bounds.

BUG=skia:
R=reed@google.com

Committed: https://code.google.com/p/skia/source/detail?r=13803

[Stephen White, 2014-03-13 20:14:06]

reed@, bsalomon@: PTAL. Thanks!

[reed1, 2014-03-13 20:32:25]

looks like maybe 2 different CLs..?

1. replace CTM with Context param
2. some new crop logic in the subclasses

Is that mostly accurate?

https://codereview.chromium.org/189913021/diff/120001/include/core/SkImageFil...
File include/core/SkImageFilter.h (right):

https://codereview.chromium.org/189913021/diff/120001/include/core/SkImageFil...
include/core/SkImageFilter.h:74: const Context& context,
tiny nit: no need to name param the same as its type. (see const SkImageFilter*
above).

[Stephen White, 2014-03-13 23:16:07]

On 2014/03/13 20:32:25, reed1 wrote:
> looks like maybe 2 different CLs..?
> 
> 1. replace CTM with Context param
> 2. some new crop logic in the subclasses
> 
> Is that mostly accurate?

Yep. I assume you want this split in two, so I'll upload just the Context
changes here, and the other changes to a different issue.

>
https://codereview.chromium.org/189913021/diff/120001/include/core/SkImageFil...
> File include/core/SkImageFilter.h (right):
> 
>
https://codereview.chromium.org/189913021/diff/120001/include/core/SkImageFil...
> include/core/SkImageFilter.h:74: const Context& context,
> tiny nit: no need to name param the same as its type. (see const
SkImageFilter*
> above).

[Stephen White, 2014-03-13 23:19:32]

New patch up: reverted everything but the Context changes.

https://codereview.chromium.org/189913021/diff/120001/include/core/SkImageFil...
File include/core/SkImageFilter.h (right):

https://codereview.chromium.org/189913021/diff/120001/include/core/SkImageFil...
include/core/SkImageFilter.h:74: const Context& context,
On 2014/03/13 20:32:25, reed1 wrote:
> tiny nit: no need to name param the same as its type. (see const
SkImageFilter*
> above).

Done.

[reed1, 2014-03-14 12:46:33]

lgtm

[Stephen White, 2014-03-14 15:44:25]

Committed patchset #9 manually as r13803 (presubmit successful).