| Name: libjpeg-turbo |
| URL: https://github.com/libjpeg-turbo/libjpeg-turbo/ |
| Version: b201838d8b5f2f80c9f86ec8405a62a002232b2c (post 2.1.0) |
| License: Custom license |
| License File: LICENSE.md |
| Security Critical: yes |
| License Android Compatible: yes |
| |
| Description: |
| This consists of the components: |
| * libjpeg-turbo b201838d8b5f2f80c9f86ec8405a62a002232b2c (post 2.1.0) |
| * This file (README.chromium) |
| * A build file (BUILD.gn) |
| * An OWNERS file |
| * A codereview.settings file |
| * Patched header files used by Chromium |
| * Deleted unused directories: cmakescripts, doc, fuzz, java, release, |
| sharedlib, simd/loongson, simd/mips, simd/powerpc, and win |
| * Deleted unused files: appveyor.yml, CMakeLists.txt, doxygen.config, |
| doxygen-extra.css, .gitattributes, md5/CMakeLists.txt, md5/md5cmp.c, |
| simd/CMakeLists.txt, tjexample.c, tjexampletest.in, tjexampletest.java.in and |
| .travis.yml |
| * Deleted legacy Arm Neon assembly files (supporting old compiler versions that |
| do not generate performant code from intrinsics): |
| simd/arm/aarch32/jsimd_neon.S, simd/arm/aarch64/jsimd_neon.S. |
| |
| 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: |
| |
| * Configuration files jconfig.h, jconfigint.h and neon-compat.h were generated |
| and then altered manually to be compatible on all of Chromium's platforms. |
| http://crbug.com/608347 |
| * Fix static const data duplication of jpeg_nbits_table. A unique copy |
| was in the jchuff.obj and jcphuff.obj resulting in an added 65k in |
| .rdata in chrome.dll and chrome_child.dll. Declaring extern const |
| in the header instead of static const and moving the definition to |
| a new .c file fixes this so only one copy is referenced. Also added |
| extern wrappers around usage in asm files. The jpeg_nbits_table.inc |
| file was also deleted. It was also necessary to give this table hidden |
| visibility to avoid invalid relocations (ignored by ld but rejected by |
| lld) arising from attempts to reference the table from assembler on |
| 32-bit x86. This only affects shared libraries, but that's important |
| for downstream Android builds. |
| * Patches to enable running the upstream unit tests through GTest. |
| The upstream unit tests are defined here under the section 'TESTS': |
| https://github.com/libjpeg-turbo/libjpeg-turbo/blob/master/CMakeLists.txt |
| These changes are tracked by Chromium issue: https://crbug.com/993876 |
| - Refactor tjunittest.c to provide test interface |
| - Move tjunittest logs from stdout to stderr |
| - Refactor tjbench.c to provide test interface |
| - Move tbench logs from stdout to stderr |
| - Write tjunittest output files to sdcard on Android |
| - Refactor cjpeg.c to provide test interface |
| - Refactor jpegtran.c to provide test interface |
| - Add input JPEG images for djpeg and jpegtran tests |
| - Refactor djpeg.c to provide test interface |
| A new gtest directory contains GTest wrappers (and associated utilities) for |
| each of tjunittest, tjbench, cjpeg, djpeg and jpegtran. |
| |
| 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 |
