Avoid matrix inverse in SkBitmapProcInfo::init for translate-only cases

Avoid matrix inverse in SkBitmapProcInfo::init for translate-only cases

If fInvMatrix doesn't have a scale component, the
really-close-to-no-scale logic is a no-op.  We can avoid an inverse op
by hoisting the check out of just_trans_clamp/just_trans_general.

R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2472003004

Committed: https://skia.googlesource.com/skia/+/544da7a7c399ab9775d6dbb441a5a695569f9939

[f(malita), 2016-11-03 20:28:30]

Description was changed from

==========
Avoid matrix inverse in SkBitmapProcInfo::init for translate-only cases

If fInvMatrix doesn't have a scale component, the
really-close-to-no-scale logic is a no-op.  We can avoid an inverse op
by hoisting the check out of just_trans_clamp/just_trans_general.

R=reed@google.com
==========

to

==========
Avoid matrix inverse in SkBitmapProcInfo::init for translate-only cases

If fInvMatrix doesn't have a scale component, the
really-close-to-no-scale logic is a no-op.  We can avoid an inverse op
by hoisting the check out of just_trans_clamp/just_trans_general.

R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2472003004
==========

[f(malita), 2016-11-03 20:30:08]

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

[commit-bot: I haz the power, 2016-11-03 20:30:12]

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

[reed1, 2016-11-03 20:41:35]

lgtm

[commit-bot: I haz the power, 2016-11-03 21:03:32]

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

[commit-bot: I haz the power, 2016-11-03 21:03:38]

Dry run: This issue passed the CQ dry run.

[f(malita), 2016-11-03 21:19:18]

The CQ bit was checked by fmalita@chromium.org

[f(malita), 2016-11-03 21:19:18]

The patchset sent to the CQ was uploaded after l-g-t-m from reed@google.com
Link to the patchset: https://codereview.chromium.org/2472003004/#ps20001
(title: "simplified matrix type test")

[commit-bot: I haz the power, 2016-11-03 21:19:22]

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 21:43:56]

Description was changed from

==========
Avoid matrix inverse in SkBitmapProcInfo::init for translate-only cases

If fInvMatrix doesn't have a scale component, the
really-close-to-no-scale logic is a no-op.  We can avoid an inverse op
by hoisting the check out of just_trans_clamp/just_trans_general.

R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2472003004
==========

to

==========
Avoid matrix inverse in SkBitmapProcInfo::init for translate-only cases

If fInvMatrix doesn't have a scale component, the
really-close-to-no-scale logic is a no-op.  We can avoid an inverse op
by hoisting the check out of just_trans_clamp/just_trans_general.

R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2472003004

Committed:
https://skia.googlesource.com/skia/+/544da7a7c399ab9775d6dbb441a5a695569f9939
==========

[commit-bot: I haz the power, 2016-11-03 21:43:57]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/544da7a7c399ab9775d6dbb441a5a695569f9939