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# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## Unreleased
### Added
- decoder API: Ability to decode the content of metadata boxes:
`JXL_DEC_BOX`, `JXL_DEC_BOX_NEED_MORE_OUTPUT`, `JxlDecoderSetBoxBuffer`,
`JxlDecoderGetBoxType`, `JxlDecoderGetBoxSizeRaw` and
`JxlDecoderSetDecompressBoxes`
- decoder API: ability to mark the input is finished: `JxlDecoderCloseInput`
- encoder API: ability to add metadata boxes, added new functions
`JxlEncoderAddBox`, `JxlEncoderUseBoxes`, `JxlEncoderCloseBoxes` and
`JxlEncoderCloseFrames`.
- decoder API: new function `JxlDecoderSetCoalesced` to allow decoding
non-coalesced (unblended) frames, e.g. layers of a composite still image
or the cropped frames of a recompressed GIF/APNG.
- decoder API: field added to `JxlFrameHeader`: a `JxlLayerInfo` struct
that contains crop dimensions and offsets and blending information for
the non-coalesced case.
- decoder API: new function `JxlDecoderGetExtraChannelBlendInfo` to get
the blending information for extra channels in the non-coalesced case.
- decoder API: new function `JxlDecoderSetMultithreadedImageOutCallback`,
allowing output callbacks to receive more information about the number of
threads on which they are running.
- encoder API: added ability to set several encoder options to frames using
`JxlEncoderFrameSettingsSetOption`
- encoder API: new functions `JxlEncoderSetFrameHeader` and
`JxlEncoderSetExtraChannelBlendInfo` to set animation
and blending parameters of the frame, and `JxlEncoderInitFrameHeader` and
`JxlEncoderInitBlendInfo` to initialize the structs to set.
- decoder/encoder API: add two fields to `JXLBasicInfo`: `intrinsic_xsize`
and `intrinsic_ysize` to signal the intrinsic size.
- encoder API: ability to encode arbitrary extra channels:
`JxlEncoderInitExtraChannelInfo`, `JxlEncoderSetExtraChannelInfo`,
`JxlEncoderSetExtraChannelName` and `JxlEncoderSetExtraChannelBuffer`.
### Changed
- decoder API: using `JxlDecoderCloseInput` at the end of all input is required
when using JXL_DEC_BOX, and is now also encouraged in other cases, but not
required in those other cases for backwards compatiblity.
- encoder API: `JxlEncoderCloseInput` now closes both frames and boxes input.
### Deprecated
- encoder API: `JxlEncoderOptions`: use `JxlEncoderFrameSettings` instead
- encoder API: `JxlEncoderOptionsCreate`: use `JxlEncoderFrameSettingsCreate`
instead
- encoder API: `JxlEncoderOptionsSetDistance`: use `JxlEncoderSetFrameDistance`
instead
- encoder API: `JxlEncoderOptionsSetLossless`: use `JxlEncoderSetFrameLossless`
instead
- encoder API: `JxlEncoderOptionsSetEffort`: use `JxlEncoderFrameSettingsSetOption(
frame_settings, JXL_ENC_FRAME_SETTING_EFFORT, effort)` instead.
- encoder API: `JxlEncoderOptionsSetDecodingSpeed`: use
`JxlEncoderFrameSettingsSetOption(frame_settings,
JXL_ENC_FRAME_SETTING_DECODING_SPEED, tier)` instead.
- encoder API: deprecated `JXL_ENC_NOT_SUPPORTED`, the encoder returns
`JXL_ENC_ERROR` instead and there is no need to handle
`JXL_ENC_NOT_SUPPORTED`.
## [0.6.1] - 2021-10-29
### Changed
- Security: Fix OOB read in splines rendering (#735 -
[CVE-2021-22563](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22563))
- Security: Fix OOB copy (read/write) in out-of-order/multi-threaded decoding
(#708 - [CVE-2021-22564](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22564))
- Fix segfault in `djxl` tool with `--allow_partial_files` flag (#781).
- Fix border in extra channels when using upsampling (#796)
## [0.6] - 2021-10-04
### Added
- API: New functions to decode extra channels:
`JxlDecoderExtraChannelBufferSize` and `JxlDecoderSetExtraChannelBuffer`.
- API: New function `JxlEncoderInitBasicInfo` to initialize `JxlBasicInfo`
(only needed when encoding). NOTE: it is now required to call this function
when using the encoder. Padding was added to the struct for forward
compatibility.
- API: Support for encoding oriented images.
- API: FLOAT16 support in the encoder API.
- Rewrite of the GDK pixbuf loader plugin. Added proper color management and
animation support.
- Rewrite of GIMP plugin. Added compression parameters dialog and switched to
using the public C API.
- Debian packages for GDK pixbuf loader (`libjxl-gdk-pixbuf`) and GIMP
(`libjxl-gimp-plugin`) plugins.
- `cjxl`/`djxl` support for `stdin` and `stdout`.
### Changed
- API: Renamed the field `alpha_associated` in `JxlExtraChannelInfo` to
`alpha_premultiplied`, to match the corresponding name in `JxlBasicInfo`.
- Improved the 2x2 downscaling method in the encoder for the optional color
channel resampling for low bit rates.
- Fixed: the combination of floating point original data, XYB color encoding,
and Modular mode was broken (in both encoder and decoder). It now works.
NOTE: this can cause the current encoder to write jxl bitstreams that do
not decode with the old decoder. In particular this will happen when using
cjxl with PFM, EXR, or floating point PSD input, and a combination of XYB
and modular mode is used (which caused an encoder error before), e.g.
using options like `-m -q 80` (lossy modular), `-d 4.5` or `--progressive_dc=1`
(modular DC frame), or default lossy encoding on an image where patches
end up being used. There is no problem when using cjxl with PNG, JPEG, GIF,
APNG, PPM, PGM, PGX, or integer (8-bit or 16-bit) PSD input.
- `libjxl` static library now bundles skcms, fixing static linking in
downstream projects when skcms is used.
- Spline rendering performance improvements.
- Butteraugli changes for less visual masking.
## [0.5] - 2021-08-02
### Added
- API: New function to decode the image using a callback outputting a part of a
row per call.
- API: 16-bit float output support.
- API: `JxlDecoderRewind` and `JxlDecoderSkipFrames` functions to skip more
efficiently to earlier animation frames.
- API: `JxlDecoderSetPreferredColorProfile` function to choose color profile in
certain circumstances.
- encoder: Adding `center_x` and `center_y` flags for more control of the tile
order.
- New encoder speeds `lightning` (1) and `thunder` (2).
### Changed
- Re-licensed the project under a BSD 3-Clause license. See the
[LICENSE](LICENSE) and [PATENTS](PATENTS) files for details.
- Full JPEG XL part 1 specification support: Implemented all the spec required
to decode files to pixels, including cases that are not used by the encoder
yet. Part 2 of the spec (container format) is final but not fully implemented
here.
- Butteraugli metric improvements. Exact numbers are different from previous
versions.
- Memory reductions during decoding.
- Reduce the size of the jxl_dec library by removing dependencies.
- A few encoding speedups.
- Clarify the security policy.
- Significant encoding improvements (~5 %) and less ringing.
- Butteraugli metric to have some less masking.
- `cjxl` flag `--speed` is deprecated and replaced by the `--effort` synonym.
### Removed
- API for returning a downsampled DC was deprecated
(`JxlDecoderDCOutBufferSize` and `JxlDecoderSetDCOutBuffer`) and will be
removed in the next release.
## [0.3.7] - 2021-03-29
### Changed
- Fix a rounding issue in 8-bit decoding.
## [0.3.6] - 2021-03-25
### Changed
- Fix a bug that could result in the generation of invalid codestreams as
well as failure to decode valid streams.
## [0.3.5] - 2021-03-23
### Added
- New encode-time options for faster decoding at the cost of quality.
- Man pages for cjxl and djxl.
### Changed
- Memory usage improvements.
- Faster decoding to 8-bit output with the C API.
- GIMP plugin: avoid the sRGB conversion dialog for sRGB images, do not show
a console window on Windows.
- Various bug fixes.
## [0.3.4] - 2021-03-16
### Changed
- Improved box parsing.
- Improved metadata handling.
- Performance and memory usage improvements.
## [0.3.3] - 2021-03-05
### Changed
- Performance improvements for small images.
- Add a (flag-protected) non-high-precision mode with better speed.
- Significantly speed up the PQ EOTF.
- Allow optional HDR tone mapping in djxl (--tone_map, --display_nits).
- Change the behavior of djxl -j to make it consistent with cjxl (#153).
- Improve image quality.
- Improve EXIF handling.
## [0.3.2] - 2021-02-12
### Changed
- Fix embedded ICC encoding regression
[#149](https://gitlab.com/wg1/jpeg-xl/-/issues/149).
## [0.3.1] - 2021-02-10
### Changed
- New experimental Butteraugli API (`jxl/butteraugli.h`).
- Encoder improvements to low quality settings.
- Bug fixes, including fuzzer-found potential security bug fixes.
- Fixed `-q 100` and `-d 0` not triggering lossless modes.
## [0.3] - 2021-01-29
### Changed
- Minor change to the Decoder C API to accommodate future work for other ways
to provide input.
- Future decoder C API changes will be backwards compatible.
- Lots of bug fixes since the previous version.
## [0.2] - 2020-12-24
### Added
- JPEG XL bitstream format is frozen. Files encoded with 0.2 will be supported
by future versions.
### Changed
- Files encoded with previous versions are not supported.
## [0.1.1] - 2020-12-01
## [0.1] - 2020-11-14
### Added
- Initial release of an encoder (`cjxl`) and decoder (`djxl`) that work
together as well as a benchmark tool for comparison with other codecs
(`benchmark_xl`).
- Note: JPEG XL format is in the final stages of standardization, minor changes
to the codestream format are still possible but we are not expecting any
changes beyond what is required by bug fixing.
- API: new decoder API in C, check the `examples/` directory for its example
usage. The C API is a work in progress and likely to change both in API and
ABI in future releases.
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