third_party/libpng/README.google - Issue 2033063003: Check libpng directly into third_party/

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Issue 2033063003: Check libpng directly into third_party/ (Closed) Base URL: https://skia.googlesource.com/skia.git@master

Patch Set: Trim more files Created 4 years, 6 months ago

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1 URL: http://www.libpng.org/pub/png/libpng.html	1 URL: http://www.libpng.org/pub/png/libpng.html

2 Version: 1.6.16	2 Version: 1.6.22rc01

3 License: libpng license	3 License: libpng license

4 License File: LICENSE, pulled out of png.h	4 License File: LICENSE, pulled out of png.h

5 Description: png compression/decompression library	5 Description: png compression/decompression library

6 Local Modifications:	6 Local Modifications:

7 (1) Created pnglibconf.h from pnglibconf.h.prebuilt (a	7 (1) Created pnglibconf.h from pnglibconf.h.prebuilt (a

8 rename with a few additional settings enabled).	8 rename with a few additional settings enabled).

9 (2) Copied LICENSE into this directory. (Originally it	9 (2) Included Intel optimizations by running:

10 was pulled from png.h, but libpng has now provided a

11 separate LICENSE file for convenience, which we use

12 directly.)

13 (3) Included Intel optimizations by running:

14 "patch -i contrib/intel/intel_sse.patch -p1"	10 "patch -i contrib/intel/intel_sse.patch -p1"

15	11 (3) Removed files unused by Skia

16 FAQ:

17 Q: Why does this directory exist?

18 A: libpng is pulled in through DEPS, but in order to build it using ninja, we

19 need to create pnglibconf.h. We originally tried creating

20 the file as an action in https://codereview.chromium.org/930283002/, but this

21 apparently led to a race condition on Windows, where some builds failed to

22 create the file in time for other files to include it. By checking these

23 files directly into Skia, we eliminate the race condition.

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