SkSwizzler: Factor skipping zeros out into a helper function.
I figure something like this lets us not worry about it in the new opts.
This skips only leading zeros per-scanline, not all zeros, but my bet is that
leading zeros are all that matters: it's got to be rare that a scanline is both
larger than 1024 pixels and has runs of 1024 transparent pixels in the middle.
I bet the big bang for the buck comes from skipping full scanlines (or even
multiple adjacent scanlines).
BUG=skia:4767
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1566653007
Review URL: https://codereview.chromium.org/1566653007
2 files changed