Add SkSourceGammaTreatment enum so we know how to create mips

Add new SkSourceGammaTreatment enum, used in situations like mipmap construction, where we need to know if we should respect (vs. ignore) the gamma encoding of sRGB tagged images. Plumb that extensively.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2037413002

Committed: https://skia.googlesource.com/skia/+/982eb7f377a0c771345276558072deb2fcea0d3e

[Brian Osman, 2016-06-06 14:49:29]

Description was changed from

==========
Plumb gammaCorrect flag extensively so we know how to create mips

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

to

==========
Plumb gammaCorrect flag extensively so we know how to create mips

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2037413002
==========

[Brian Osman, 2016-06-06 14:58:28]

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

[Brian Osman, 2016-06-06 14:58:29]

This is a lot of plumbing. I'm sorry. Perhaps we'll need the flag in other
shaders in the future?

https://codereview.chromium.org/2037413002/diff/20001/src/gpu/SkGr.cpp
File src/gpu/SkGr.cpp (right):

https://codereview.chromium.org/2037413002/diff/20001/src/gpu/SkGr.cpp#newcod...
src/gpu/SkGr.cpp:333: bool gammaCorrect)
Here's the flag for the CPU mip-mapping call. We made it. Phew.

[Brian Osman, 2016-06-06 15:02:09]

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

[commit-bot: I haz the power, 2016-06-06 15:02:13]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2037413002/20001

[commit-bot: I haz the power, 2016-06-06 15:24:03]

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

[commit-bot: I haz the power, 2016-06-06 15:24:04]

Dry run: This issue passed the CQ dry run.

[Brian Osman, 2016-06-06 17:59:04]

Description was changed from

==========
Plumb gammaCorrect flag extensively so we know how to create mips

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2037413002
==========

to

==========
Add new SkSourceGammaTreatment enum, used in situations like mipmap
construction, where we need to know if we should respect (vs. ignore) the gamma
encoding of sRGB tagged images. Plumb that extensively.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2037413002
==========

[Brian Osman, 2016-06-06 18:02:04]

New version with an enum. We need Mike's change to land so we can connect the
dots in GrGenerateMipMapsAndUploadToTexture.

Additionally, other to-do work:
- Replace some more 'bool gammaCorrect' stuff in Ganesh with the new flag where
it makes sense (paint conversion, etc...)
- Plumb the flag down to GrTexture construction (or set the
fMipMapsAreSRGBCorrect flag post-construction in
GrGenerateMipsAndUploadToTexture), so that CPU-constructed mips are known to be
gamma-correct or not.
- Bundle arguments to asFragmentProcessor in a struct so no one ever has to do
this again.

[Brian Osman, 2016-06-06 18:04:13]

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

[commit-bot: I haz the power, 2016-06-06 18:04:20]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2037413002/60001

[commit-bot: I haz the power, 2016-06-06 18:07:30]

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

[commit-bot: I haz the power, 2016-06-06 18:07:31]

Dry run: Try jobs failed on following builders:
  Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot on client.skia (JOB_FAILED,
http://build.chromium.org/p/client.skia/builders/Test-Ubuntu-GCC-GCE-CPU-AVX2...)
  Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-Shared-Trybot on client.skia
(JOB_FAILED,
http://build.chromium.org/p/client.skia/builders/Test-Ubuntu-GCC-GCE-CPU-AVX2...)

[Brian Osman, 2016-06-06 18:16:47]

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

[commit-bot: I haz the power, 2016-06-06 18:16:53]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2037413002/80001

[commit-bot: I haz the power, 2016-06-06 18:22:00]

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

[commit-bot: I haz the power, 2016-06-06 18:22:01]

Dry run: Try jobs failed on following builders:
  Test-Ubuntu-GCC-ShuttleA-GPU-GTX660-x86_64-Release-Trybot on client.skia
(JOB_FAILED,
http://build.chromium.org/p/client.skia/builders/Test-Ubuntu-GCC-ShuttleA-GPU...)

[Brian Osman, 2016-06-06 18:50:54]

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

[commit-bot: I haz the power, 2016-06-06 18:51:02]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2037413002/100001

[commit-bot: I haz the power, 2016-06-06 19:11:02]

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

[commit-bot: I haz the power, 2016-06-06 19:11:03]

Dry run: This issue passed the CQ dry run.

[bsalomon, 2016-06-06 19:57:02]

lgtm

[Brian Osman, 2016-06-06 20:09:25]

The CQ bit was checked by brianosman@google.com

[commit-bot: I haz the power, 2016-06-06 20:09:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2037413002/100001

[commit-bot: I haz the power, 2016-06-06 20:11:05]

Description was changed from

==========
Add new SkSourceGammaTreatment enum, used in situations like mipmap
construction, where we need to know if we should respect (vs. ignore) the gamma
encoding of sRGB tagged images. Plumb that extensively.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2037413002
==========

to

==========
Add new SkSourceGammaTreatment enum, used in situations like mipmap
construction, where we need to know if we should respect (vs. ignore) the gamma
encoding of sRGB tagged images. Plumb that extensively.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2037413002

Committed:
https://skia.googlesource.com/skia/+/982eb7f377a0c771345276558072deb2fcea0d3e
==========

[commit-bot: I haz the power, 2016-06-06 20:11:06]

Committed patchset #6 (id:100001) as
https://skia.googlesource.com/skia/+/982eb7f377a0c771345276558072deb2fcea0d3e