use conics for round joins and caps

use conics for round joins and caps

BUG=skia:

[reed2, 2015-02-10 04:20:32]

reed@chromium.org changed reviewers:
+ caryclark@google.com, fmalita@google.com

[reed2, 2015-02-10 04:20:32]

ptal

[reed2, 2015-02-10 04:20:37]

The CQ bit was checked by reed@chromium.org

[commit-bot: I haz the power, 2015-02-10 04:21:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/909013004/20001

[commit-bot: I haz the power, 2015-02-10 04:21:19]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-02-10 10:21 UTC

[commit-bot: I haz the power, 2015-02-10 10:21:19]

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

[commit-bot: I haz the power, 2015-02-10 10:21:20]

No LGTM from a valid reviewer yet. Please ask for an LGTM from a
full Skia committer from
https://skia.googlesource.com/skia/+/master/CQ_COMMITTERS

[caryclark, 2015-02-10 11:59:34]

lgtm

https://codereview.chromium.org/909013004/diff/20001/src/core/SkGeometry.h
File src/core/SkGeometry.h (left):

https://codereview.chromium.org/909013004/diff/20001/src/core/SkGeometry.h#ol...
src/core/SkGeometry.h:9: 
accidental whitespace change?

https://codereview.chromium.org/909013004/diff/20001/src/core/SkStrokerPriv.cpp
File src/core/SkStrokerPriv.cpp (right):

https://codereview.chromium.org/909013004/diff/20001/src/core/SkStrokerPriv.c...
src/core/SkStrokerPriv.cpp:46: stop.fX, stop.fY, SK_ScalarRoot2Over2);
I wonder if the compiler can't fold

   pivot.fX + parallel.fX
   pivot.fY + parallel.fY

(which occur three times each) because +/- normal.fX/Y is in the middle ...
Maybe pull it out or reorder the addition to give the compiler a chance to reuse
the common expression?

https://codereview.chromium.org/909013004/diff/20001/src/core/SkStrokerPriv.c...
src/core/SkStrokerPriv.cpp:165: int count = SkConic::BuildUnitArc(before, after,
dir, &matrix, conics);
SkASSERT(count <= SkConic::kMaxConicsForArc);  ? mebbe overkill

[reed1, 2015-02-10 15:15:19]

reed@google.com changed reviewers:
+ reed@google.com

[reed1, 2015-02-10 15:15:20]

moved this CL to https://codereview.chromium.org/910213002