Add minimal support for readPixels in raster F16

Add minimal support for readPixels in raster F16

Still doesn't support doing premul <-> unpremul conversions, but handles
the simple cases (which would previously always fail). Fixes the new gamut
gm (partially) in f16 config.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2321673002

Committed: https://skia.googlesource.com/skia/+/c544e7043c9727fb5697120e241b6860816ef749

[Brian Osman, 2016-09-07 17:45:52]

Description was changed from

==========
Add minimal support for readPixels in raster F16

Still doesn't support doing premul <-> unpremul conversions, but handles
the simple cases (which would previously always fail). Fixes the new gamut
gm (partially) in f16 config.

BUG=skia:
==========

to

==========
Add minimal support for readPixels in raster F16

Still doesn't support doing premul <-> unpremul conversions, but handles
the simple cases (which would previously always fail). Fixes the new gamut
gm (partially) in f16 config.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2321673002
==========

[Brian Osman, 2016-09-07 17:47:40]

The CQ bit was checked by brianosman@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-09-07 17:47:41]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Brian Osman, 2016-09-07 17:47:53]

brianosman@google.com changed reviewers:
+ mtklein@google.com, reed@google.com

[reed1, 2016-09-07 18:10:21]

do we have any tests/gms to update to exercise this?

lgtm

[commit-bot: I haz the power, 2016-09-07 18:17:13]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-07 18:17:14]

Dry run: This issue passed the CQ dry run.

[Brian Osman, 2016-09-07 18:29:49]

The CQ bit was checked by brianosman@google.com

[commit-bot: I haz the power, 2016-09-07 18:29:54]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-07 18:30:48]

Description was changed from

==========
Add minimal support for readPixels in raster F16

Still doesn't support doing premul <-> unpremul conversions, but handles
the simple cases (which would previously always fail). Fixes the new gamut
gm (partially) in f16 config.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2321673002
==========

to

==========
Add minimal support for readPixels in raster F16

Still doesn't support doing premul <-> unpremul conversions, but handles
the simple cases (which would previously always fail). Fixes the new gamut
gm (partially) in f16 config.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2321673002

Committed:
https://skia.googlesource.com/skia/+/c544e7043c9727fb5697120e241b6860816ef749
==========

[commit-bot: I haz the power, 2016-09-07 18:30:49]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/c544e7043c9727fb5697120e241b6860816ef749