Optimize SkTileImageFilter destination bitmap size.

Optimize SkTileImageFilter destination bitmap size.

The destination bitmap size was not being clipped by the clip bounds,
so tiled rendering (ie., clipping to a small region and rendering
a SkTileImageFilter with a large dstRect) was much slower than
non-tiled rendering.

Correctness is covered by unit test ImageFilterDrawTiled, and
performance by TileImageFilterBench.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1563873002

Committed: https://skia.googlesource.com/skia/+/b50b97d70a62d90f5266113c9a5ba6cd1b912edd

[Stephen White, 2016-01-06 16:00:17]

Description was changed from

==========
Optimize SkTileImageFilter destination bitmap size.

The destination bitmap size was not being clipped by the clip bounds,
so tiled rendering (ie., clipping to a small region and rendering
a SkTileImageFilter with a large dstRect) was much slower than
non-tiled rendering.

Correctness is covered by unit test ImageFilterDrawTiled, and
performance by TileImageFilterBench.

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

to

==========
Optimize SkTileImageFilter destination bitmap size.

The destination bitmap size was not being clipped by the clip bounds,
so tiled rendering (ie., clipping to a small region and rendering
a SkTileImageFilter with a large dstRect) was much slower than
non-tiled rendering.

Correctness is covered by unit test ImageFilterDrawTiled, and
performance by TileImageFilterBench.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[Stephen White, 2016-01-06 16:04:13]

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

[commit-bot: I haz the power, 2016-01-06 16:04:19]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1563873002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1563873002/1

[Stephen White, 2016-01-06 16:17:43]

Description was changed from

==========
Optimize SkTileImageFilter destination bitmap size.

The destination bitmap size was not being clipped by the clip bounds,
so tiled rendering (ie., clipping to a small region and rendering
a SkTileImageFilter with a large dstRect) was much slower than
non-tiled rendering.

Correctness is covered by unit test ImageFilterDrawTiled, and
performance by TileImageFilterBench.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Optimize SkTileImageFilter destination bitmap size.

The destination bitmap size was not being clipped by the clip bounds,
so tiled rendering (ie., clipping to a small region and rendering
a SkTileImageFilter with a large dstRect) was much slower than
non-tiled rendering.

Correctness is covered by unit test ImageFilterDrawTiled, and
performance by TileImageFilterBench.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[Stephen White, 2016-01-06 16:17:43]

senorblanco@chromium.org changed reviewers:
+ robertphillips@google.com

[Stephen White, 2016-01-06 16:17:50]

Rob: PTAL. Thanks!

[commit-bot: I haz the power, 2016-01-06 16:20:41]

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

[commit-bot: I haz the power, 2016-01-06 16:20:42]

Dry run: This issue passed the CQ dry run.

[robertphillips, 2016-01-06 17:45:07]

lgtm

[Stephen White, 2016-01-06 17:45:38]

The CQ bit was checked by senorblanco@chromium.org

[commit-bot: I haz the power, 2016-01-06 17:45:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1563873002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1563873002/1

[commit-bot: I haz the power, 2016-01-06 17:46:26]

Description was changed from

==========
Optimize SkTileImageFilter destination bitmap size.

The destination bitmap size was not being clipped by the clip bounds,
so tiled rendering (ie., clipping to a small region and rendering
a SkTileImageFilter with a large dstRect) was much slower than
non-tiled rendering.

Correctness is covered by unit test ImageFilterDrawTiled, and
performance by TileImageFilterBench.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Optimize SkTileImageFilter destination bitmap size.

The destination bitmap size was not being clipped by the clip bounds,
so tiled rendering (ie., clipping to a small region and rendering
a SkTileImageFilter with a large dstRect) was much slower than
non-tiled rendering.

Correctness is covered by unit test ImageFilterDrawTiled, and
performance by TileImageFilterBench.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/b50b97d70a62d90f5266113c9a5ba6cd1b912edd
==========

[commit-bot: I haz the power, 2016-01-06 17:46:27]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/b50b97d70a62d90f5266113c9a5ba6cd1b912edd