URL: http://www.libpng.org/pub/png/libpng.html
Version: 1.6.16
License: libpng license
License File: LICENSE, pulled out of png.h
Description: png compression/decompression library
Local Modifications:
(1) Created pnglibconf.h from pnglibconf.h.prebuilt (a
rename with a few additional settings enabled).
(2) Copied LICENSE into this directory. (Originally it
was pulled from png.h, but libpng has now provided a
separate LICENSE file for convenience, which we use
directly.)
(3) Included Intel optimizations by running:
"patch -i contrib/intel/intel_sse.patch -p1"
FAQ:
Q: Why does this directory exist?
A: libpng is pulled in through DEPS, but in order to build it using ninja, we
need to create pnglibconf.h. We originally tried creating
the file as an action in https://codereview.chromium.org/930283002/, but this
apparently led to a race condition on Windows, where some builds failed to
create the file in time for other files to include it. By checking these
files directly into Skia, we eliminate the race condition.
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