Prefer native scaling to sampling

Prefer native scaling to sampling

In the cases we have come across so far, native scaling has better performance
and correctness than sampling.  If native scaling is supported we want to use
it.

Jpegs native scale rounds up.
Ex: An 11x11 image with sampleSize=8 scales to 2x2.

SkScaledCodec rounds down.
Ex: An 11x11 image with sampleSize=8 scales to 1x1.

Before the CL, we would choose to use SkScaledCodec because it scales closer to
the "ideal" scale.

I think we want to go with the native option as long as its within 1 of the
ideal value.
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/a83593b88a38765eba5f349d4e12d66b3e626af9

[msarett, 2015-08-18 14:31:02]

msarett@google.com changed reviewers:
+ djsollen@google.com

[msarett, 2015-08-18 14:31:02]

In the cases we have come across so far, native scaling has better performance
and correctness than sampling.  If native scaling is supported we want to use
it.

Jpegs native scale rounds up.
Ex: An 11x11 image with sampleSize=8 scales to 2x2.

SkScaledCodec rounds down.
Ex: An 11x11 image with sampleSize=8 scales to 1x1.

Before the CL, we would choose to use SkScaledCodec because it scales closer to
the "ideal" scale.

I think we want to go with the native option as long as its within 1 of the
ideal value.

[msarett, 2015-08-18 14:31:11]

msarett@google.com changed reviewers:
+ scroggo@google.com

[djsollen, 2015-08-18 14:55:20]

lgtm

[msarett, 2015-08-18 14:57:17]

The CQ bit was checked by msarett@google.com

[commit-bot: I haz the power, 2015-08-18 14:57:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284243004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284243004/1

[commit-bot: I haz the power, 2015-08-18 15:04:02]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/a83593b88a38765eba5f349d4e12d66b3e626af9

[scroggo, 2015-08-27 21:41:00]

On 2015/08/18 15:04:02, commit-bot: I haz the power wrote:
> Committed patchset #1 (id:1) as
> https://skia.googlesource.com/skia/+/a83593b88a38765eba5f349d4e12d66b3e626af9

LGTM