Force input coverage to be only a byte in gpu shaders.

Force input coverage to be only a byte in gpu shaders.

Prime coverage invariant output calculations with single component

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/37b4d866b1446d35c989f9a97885a777ddc7d1c8

[egdaniel, 2014-10-24 14:46:42]

egdaniel@google.com changed reviewers:
+ bsalomon@google.com

[bsalomon, 2014-10-24 15:13:59]

https://codereview.chromium.org/649783003/diff/1/src/gpu/GrDrawState.cpp
File src/gpu/GrDrawState.cpp (right):

https://codereview.chromium.org/649783003/diff/1/src/gpu/GrDrawState.cpp#newc...
src/gpu/GrDrawState.cpp:392: inout.fIsSingleComponent = true;
I think it is time to enforce that the coverage attr is single component now
that we're init'ing this to true when it is present.

[egdaniel, 2014-10-31 20:29:03]

updated so that we now enforce input coverage to be a single byte

[bsalomon, 2014-11-03 15:06:58]

lgtm

[egdaniel, 2014-11-03 17:57:33]

The CQ bit was checked by egdaniel@google.com

[commit-bot: I haz the power, 2014-11-03 17:58:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/649783003/80001

[commit-bot: I haz the power, 2014-11-03 18:07:11]

Committed patchset #5 (id:80001) as 37b4d866b1446d35c989f9a97885a777ddc7d1c8

[jcgregorio, 2014-11-05 19:51:02]

On 2014/11/03 18:07:11, I haz the power (commit-bot) wrote:
> Committed patchset #5 (id:80001) as 37b4d866b1446d35c989f9a97885a777ddc7d1c8

Is this an expected performance change from this CL?

  https://skiaperf.com/#1262