lepton 1.2.1 (new formula)

[zmwangx]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same formula update/change?
• Have you built your formula locally prior to submission with brew install <formula> (where <formula> is the name of the formula you're submitting)?
• See explanation below. Does your submission pass brew audit --strict --online <formula> (after doing brew install <formula>)?

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This file format and tool is newly open sourced. See
https://blogs.dropbox.com/tech/2016/07/lepton-image-compression-saving-22-losslessly-from-images-at-15mbs/.

It doesn't pass audit at the moment because the GitHub repo is too new, but the code base itself is by no means new — initial commit dates back to June 2015. And Dropbox being Dropbox this repo is quickly gaining traction (500+ stars at time of writing, < 1 day after the blog post).

If the formula isn't acceptable at this point, I'll just leave it around and bump it in a month.

[zmwangx]

Other than expected audit problem, El Cap:

/usr/local/Library/ENV/4.3/clang++    -I/tmp/lepton-20160715-76959-d9zmzc/lepton-1.0 -I/tmp/lepton-20160715-76959-d9zmzc/lepton-1.0/src/vp8/util -I/tmp/lepton-20160715-76959-d9zmzc/lepton-1.0/src/vp8/model -I/tmp/lepton-20160715-76959-d9zmzc/lepton-1.0/src/vp8/encoder -I/tmp/lepton-20160715-76959-d9zmzc/lepton-1.0/src/vp8/decoder  -std=c++11 -fno-exceptions -fno-rtti -DNDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -mmacosx-version-min=10.11   -march=core-avx2   -o CMakeFiles/lepton-avx.dir/src/lepton/idct.cc.o -c /tmp/lepton-20160715-76959-d9zmzc/lepton-1.0/src/lepton/idct.cc
/tmp/lepton-20160715-76959-d9zmzc/lepton-1.0/src/lepton/idct.cc:228:15: error: always_inline function '_mm_mullo_epi32' requires target feature 'sse4.1', but would be inlined into function 'idct_sse' that is compiled without support for 'sse4.1'
        xv8 = _mm_mullo_epi32(_mm_set1_epi32(w7), _mm_add_epi32(xv4, xv5));
              ^
        ...

Mavericks and Yosemite:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/7.0.2/include/smmintrin.h:28:2: error: "SSE4.1 instruction set not enabled"

Any insight? I don't see this locally, and this is wandering into the hardware domain which I have absolutely no idea of.

[zmwangx]

Reported upstream: dropbox/lepton#11.

[MikeMcQuaid]

Would https://github.com/dropbox/lepton/commit/d122450.patch work?

[zmwangx]

That patch is simply this inreplace plus an irrelevant typo fix in README, so I figured there's no reason to add another download.

[MikeMcQuaid]

Patches are a bit more self-documenting and tend to get removed more readily when not needed so if you could remove it that'd be great.

[zmwangx]

I've applied a big patch that brings the whole package to latest git master which is dropbox/lepton@acfb6ae. It's not intended for shipping; I just to need to test some upstream fixes and/or improvements on the test bot.

[zmwangx]

Bumped to 1.2.

[zmwangx]

We're making good progress here: builds on Mavericks and Yosemite now pass. There's still a (new) problem on El Cap, which I reported upstream in a new issue: dropbox/lepton#28.

[zmwangx]

@MikeMcQuaid Everything is now sorted out in 1.2.1. Guess we'll just wait for the 30 days mark, or maybe an exception could be made due to popularity (~3000 stars in three days)?

[DomT4]

Yeah, I think the 30 day limit is an inappropriate judge here given the actual codebase is significantly older. We've accepted projects before that are new to GitHub but not "new".

Merged in 33601fc. Thank you once again @zmwangx!