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scroggo 77b798ce8e Update the version of libpng used by Skia tests The version of libpng we were using has some security vulnerabilities. Update to a newer version - 1.6.20 (`047737496a`/). Update pnglibconf.h. The new version is a copy of the newer version of the file, with our /* custom settings */ tacked onto the end. (The custom settings are unchanged from the last version.) Update the LICENSE. The new version is a copy of the LICENSE that libpng now includes as a separate file. Update the README file to reflect the change in source of the LICENSE file. BUG=skia:4573 GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1453373003 Review URL: https://codereview.chromium.org/1453373003		2016-02-19 06:33:07 -08:00
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LICENSE	Update the version of libpng used by Skia tests	2016-02-19 06:33:07 -08:00
pnglibconf.h	Update the version of libpng used by Skia tests	2016-02-19 06:33:07 -08:00
README.google	Update the version of libpng used by Skia tests	2016-02-19 06:33:07 -08:00

README.google

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.)

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.