tree 3a81bd2048cb558a033f51961db47501afb38c8d
parent e76ca8b9c25672be79b670514a7fe0bceadd35e6
author scroggo <scroggo@chromium.org> 1463767707 -0700
committer Commit bot <commit-bot@chromium.org> 1463767707 -0700

Only decode opaque to premul in DM image

Previously, we would test decoding an opaque SkCodec to all three:
kUnpremul,
kPremul,
kOpaque

The image should look the same in all three cases. We already test for
that in CodecTest [1], where we require that the result matches exactly.
CodecTest runs on a smaller set of images, but it covers a variety of
opaque images. No need to test on all opaque images.

Running locally on my Mac laptop, the following command:

    dm --src image --images resources/

dropped from:
5932 srcs
11.2s

to:

3544 srcs
6.69s

for a 40% speedup.

BUG=skia:5307

[1] https://skia.googlesource.com/skia/+/master/tests/CodecTest.cpp#119
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1999593003

Review-Url: https://codereview.chromium.org/1999593003