Make clip mask cache use Scratch Texture system

Plumbing in the scratch texture system required a bit of reshuffling of the cache's texture acquisition system. I also had to make changes since we can now get textures larger than expected.

[bsalomon, 2012-05-11 21:14:06]

LGTM

http://codereview.appspot.com/6210044/diff/1/include/gpu/GrContext.h
File include/gpu/GrContext.h (right):

http://codereview.appspot.com/6210044/diff/1/include/gpu/GrContext.h#newcode856
include/gpu/GrContext.h:856: fEntry.reset();
nice catch

http://codereview.appspot.com/6210044/diff/1/src/gpu/GrClipMaskManager.cpp
File src/gpu/GrClipMaskManager.cpp (right):

http://codereview.appspot.com/6210044/diff/1/src/gpu/GrClipMaskManager.cpp#ne...
src/gpu/GrClipMaskManager.cpp:356: GrRect rect = GrRect::MakeLTRB(0, 0,
super-nit: there is a GrRecT::MakeWH that sets to top left to (0, 0)

http://codereview.appspot.com/6210044/diff/1/src/gpu/GrClipMaskManager.cpp#ne...
src/gpu/GrClipMaskManager.cpp:411: kAlpha_8_GrPixelConfig,
Are we going to have issues on ES devices that can't render to any single chan
formats?

It's not related to this change in particular. It just occurred to me while
looking at this

[robertphillips, 2012-05-14 12:19:05]

committed as r3920

http://codereview.appspot.com/6210044/diff/1/src/gpu/GrClipMaskManager.cpp
File src/gpu/GrClipMaskManager.cpp (right):

http://codereview.appspot.com/6210044/diff/1/src/gpu/GrClipMaskManager.cpp#ne...
src/gpu/GrClipMaskManager.cpp:356: GrRect rect = GrRect::MakeLTRB(0, 0,
On 2012/05/11 21:14:06, bsalomon wrote:
> super-nit: there is a GrRecT::MakeWH that sets to top left to (0, 0)

Done.

http://codereview.appspot.com/6210044/diff/1/src/gpu/GrClipMaskManager.cpp#ne...
src/gpu/GrClipMaskManager.cpp:411: kAlpha_8_GrPixelConfig,
I was hoping we could loosen up the scratch texture system so that it could
allocate an RGBA8 is no A8/R8 textures are available.