Mozjpeg Versions Save

Updated to libjpeg-turbo 2.1.3

Automated build using Appveyor

Rebased MozJPEG changes on libjpeg-turbo v2, which includes lots of bug fixes and performance improvements.

Because libjpeg-turbo has switched to cmake, MozJPEG has too. MozJPEG can now be built using either cmake or Cargo.

Automated build using Appveyor

All the changes come from libjpeg-turbo.

• Up-to-date with libjpeg-turbo v2
• Switched build system from autotools to cmake

Updated libjpeg-turbo

• Updated to libjpeg-turbo 1.5.0.
• Fixed interaction of JINT_DC_SCAN_OPT_MODE and JBOOLEAN_OPTIMIZE_SCANS (#249)
• #define JPEG_C_PARAM_SUPPORTED 1 for easier interoperability with stock libjpeg
• Minor bugfixes in yuvjpeg/jpegyuv test helper tools.
• the cjpeg demo tool guesses default -sample setting from -quality

• Updated to libjpeg-turbo 1.5.0.
• Minor bugfixes in yuvjpeg/jpegyuv test helper tools.

• Improved effectiveness of DC trellis in high-quality images
• Fixed DC overflow caused by overshoot deringing feature
• Fixed reading of 16-bit PNG images
• Fixed memory leaks in jpegyuv and jpegtran utilities
• Added cjpeg -quant-baseline option to reduce size of quantization tables
• Merged patches up to libjpeg-turbo r1482

NOTE: This release includes significant changes to the mozjpeg ABI in order to return to ABI compatibility with libjpeg-turbo. See the file ‘README-mozilla.txt’ for more information.

• mozjpeg is now backward ABI-compatible with libjpeg-turbo. See ‘README-mozilla.txt’ for more information.
• DC trellis quantization (compression improvement)
• Merge successive DQT (FFDB) and DHT (FFC4) markers in a single marker (compression improvement)
• Deringing for black-on-white text
• Option to select quantization tables
• New cjpeg flag ‘-version’ to obtain version
• PNG input support for cjpeg
• Various other improvements from syncing with latest libjpeg-turbo code