tree e9a05dc19b456c1c8582fbd80daa0253fb5bfdf9
parent e8445307ac33eddcf04457ae21040e47dc9c2a97
author emmaleer <emmaleer@google.com> 1439556368 -0700
committer Commit bot <commit-bot@chromium.org> 1439556369 -0700

SkScaledCodec class

This class does scaling by using a scanlineDecoder.
getScanlines and skipScanlines are used for y sampling,
the swizzler is used for x sampling

this class is currently only working for png and jpeg images
I will update other Codec types to work soon

For SkJpegCodec to implement width wise swizzling it now
uses a swizzler. I ran performance tests on this change.
Here are the performance test results:
https://docs.google.com/a/google.com/spreadsheets/d/1D7-Q_GXD_dI68LZO005NNvb8Wq2Ee0wEBEPG72671yw/edit?usp=sharing

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/0944100ac89f797714eeae0cf2875e2335ff52ee

Committed: https://skia.googlesource.com/skia/+/d518ea7927f9f4e0ed5b4134d1b4f48243855a47

Review URL: https://codereview.chromium.org/1260673002