Fix kMediumQuality invMatrix setup for sizes == mip levels

Fix kMediumQuality invMatrix setup for sizes == mip levels

When downscaling with kMediumQuality in non-clamp mode, if we happen to hit a size == mip level, then SkBitmapProcInfo::init takes the trivial matrix path and doesn't set up a matrix for normalized coords on the assumption that we're going to ignore the transform.  But kMediumQuality disables allow_ignore_fractional_translate, so we take the filter path after all - but with an incorrect matrix.

R=reed@google.com
BUG=chromium:661180
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2476713002

Committed: https://skia.googlesource.com/skia/+/b1c7f88df9ec40b4efb52d314304adfbaf95697c

[f(malita), 2016-11-03 17:04:13]

Description was changed from

==========
Fix kMediumQuality invMatrix setup for sizes == mip levels



R=reed@google.com
BUG=chromium:661180
==========

to

==========
Fix kMediumQuality invMatrix setup for sizes == mip levels



R=reed@google.com
BUG=chromium:661180
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2476713002
==========

[f(malita), 2016-11-03 17:13:41]

This is going to make Boole cringe.

The alternative is to defer the allow_ignore_fractional_translate logic until
after the bitmap controller did its thing.  That works too, but it changes the
semantics in that we no longer respect the original kMedium request - instead we
may drop to kNone/ignore_fractional whenever we hit a mip level size and the
matrix becomes trivial.

[f(malita), 2016-11-03 17:13:53]

The CQ bit was checked by fmalita@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-03 17:13:56]

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

[f(malita), 2016-11-03 17:17:54]

Description was changed from

==========
Fix kMediumQuality invMatrix setup for sizes == mip levels



R=reed@google.com
BUG=chromium:661180
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2476713002
==========

to

==========
Fix kMediumQuality invMatrix setup for sizes == mip levels

When downscaling with kMediumQuality in non-clamp mode, if we happen to hit a
size == mip level, then SkBitmapProcInfo::init takes the trivial matrix path and
doesn't set up a matrix for normalized coords on the assumption that we're going
to ignore the transform.  But kMediumQuality disables
allow_ignore_fractional_translate, so we take the filter path after all - but
with an incorrect matrix.

R=reed@google.com
BUG=chromium:661180
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2476713002
==========

[f(malita), 2016-11-03 17:18:08]

I'll also add a test before landing.

[f(malita), 2016-11-03 17:24:51]

fmalita@chromium.org changed reviewers:
+ herb@google.com

[commit-bot: I haz the power, 2016-11-03 17:40:34]

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

[commit-bot: I haz the power, 2016-11-03 17:40:35]

Dry run: This issue passed the CQ dry run.

[f(malita), 2016-11-03 18:11:32]

The CQ bit was checked by fmalita@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-03 18:11:34]

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

[f(malita), 2016-11-03 18:13:19]

The CQ bit was checked by fmalita@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-03 18:13:24]

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

[f(malita), 2016-11-03 18:14:02]

On 2016/11/03 17:18:08, f(malita) wrote:
> I'll also add a test before landing.

Test added, PTAL.

[reed1, 2016-11-03 18:35:40]

lgtm

[f(malita), 2016-11-03 18:37:08]

The CQ bit was unchecked by fmalita@chromium.org

[f(malita), 2016-11-03 18:37:15]

The CQ bit was checked by fmalita@chromium.org

[commit-bot: I haz the power, 2016-11-03 18:37:25]

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, 2016-11-03 18:42:53]

Description was changed from

==========
Fix kMediumQuality invMatrix setup for sizes == mip levels

When downscaling with kMediumQuality in non-clamp mode, if we happen to hit a
size == mip level, then SkBitmapProcInfo::init takes the trivial matrix path and
doesn't set up a matrix for normalized coords on the assumption that we're going
to ignore the transform.  But kMediumQuality disables
allow_ignore_fractional_translate, so we take the filter path after all - but
with an incorrect matrix.

R=reed@google.com
BUG=chromium:661180
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2476713002
==========

to

==========
Fix kMediumQuality invMatrix setup for sizes == mip levels

When downscaling with kMediumQuality in non-clamp mode, if we happen to hit a
size == mip level, then SkBitmapProcInfo::init takes the trivial matrix path and
doesn't set up a matrix for normalized coords on the assumption that we're going
to ignore the transform.  But kMediumQuality disables
allow_ignore_fractional_translate, so we take the filter path after all - but
with an incorrect matrix.

R=reed@google.com
BUG=chromium:661180
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2476713002

Committed:
https://skia.googlesource.com/skia/+/b1c7f88df9ec40b4efb52d314304adfbaf95697c
==========

[commit-bot: I haz the power, 2016-11-03 18:42:54]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/b1c7f88df9ec40b4efb52d314304adfbaf95697c