README.chromium

Name: libjpeg-turbo
URL: https://github.com/libjpeg-turbo/libjpeg-turbo/
Version: 1.4.90
License: Custom license
License File: LICENSE.md
Security Critical: yes
License Android Compatible: yes

Description:
This consists of the components:
* libjpeg-turbo 1.4.90
* Cherry picked clang fix for Arm32 assembly from upstream master:
  https://github.com/libjpeg-turbo/libjpeg-turbo/commit/5e576386b57663bbe9d934edf7c276eb0150cd59
  https://github.com/libjpeg-turbo/libjpeg-turbo/commit/2e480fa2a3285d9ff83a780ab3417badeb3f2d37
* Cherry picked uninitialized memory fix from upstream master:
  https://github.com/libjpeg-turbo/libjpeg-turbo/commit/a572622dd654305c86585724c2a1ea34e22c2103
* This file (README.chromium)
* A build file (libjpeg.gyp)
* Patched header files used by Chromium
* Deleted unused directories: cmakescripts, doc, java, md5, release, sharedlib,
* testimages, and win

This libjpeg-turbo can replace our libjpeg-6b without any modifications in the
Chromium code.

Same as our copy of libjpeg-6b, this libjpeg-turbo also added a new file
jpeglibmangler.h and included it from jpeglib.h that changes the names of all
externally visible functions to chromium_* so that we can avoid conflicts that
arise when system libraries attempt to use our libjpeg. Also, we applied the
following changes which are not merged to upstream:

* Added the 'private_extern' flags on Mac (or the 'hidden' flags on Linux) to
  all the global symbols in '.asm' files to prevent making them external ones.
  http://crbug.com/608347
* Fix libjpeg_turbo svn r64 libjpeg6b compat issue: make the fast path Huffman
  decoder fallback to slow decoding if the Huffman decoding bit sentinel > 16,
  this to match the exact behavior of jpeg_huff_decode().
  http://crbug.com/398235
* Fixed an issue with the ARM NEON build.
  http://crbug.com/451035
* Configuration files jconfig.h and jconfigint.h were written manually to be
  compatible on all of Chromium's platforms.
  http://crbug.com/608347

Refer to working-with-nested-repos [1] for details of how to setup your git
svn client to update the code (for making local changes, cherry picking from
upstream, etc).

[1] https://www.chromium.org/developers/how-tos/get-the-code/working-with-nested-repos