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CHANGELOG.md

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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, and this project adheres to Semantic Versioning.

Unreleased

Added

  • decoder API: new function JxlDecoderSetImageBitDepth to set the bit depth of the output buffer.
  • decoder API proposal: add JxlDecoderSetOutputColorProfile and JxlDecoderSetCms to enable decoding to desired colorspace; NB: not implemented yet.
  • encoder API: new function JxlEncoderSetFrameBitDepth to set the bit depth of the input buffer.
  • encoder API: add an effort 10 option for lossless compression; using this setting requires calling JxlEncoderAllowExpertOptions.
  • encoder API: new JXL_ENC_FRAME_SETTING_JPEG_COMPRESS_BOXES enum value to allow explicit control of metadata compression

Removed

  • common API: removed JxlIntrinsicSizeHeader
  • decoder API: removed deprecated JXL_DEC_NEED_DC_OUT_BUFFER and JXL_DEC_DC_IMAGE events, JxlDecoderDCOutBufferSize and JxlDecoderSetDCOutBuffer functions

Changed / clarified

  • encoder API: JxlEncoderProcessOutput requires at least 32 bytes of output space to proceed and guarantees that at least one byte will be written

[0.7] - 2022-07-21

Added

  • Export version information in headers.
  • 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.
  • decoder API: ability to request updates on different progressive events using JxlDecoderSetProgressiveDetail; currently supported events are kDC, kLastPasses and kPasses.
  • decoder API: ability to specify desired intensity target using JxlDecoderSetDesiredIntensityTarget
  • 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: new function JxlDecoderSetUnpremultiplyAlpha to set preference for getting an associated alpha channel with premultiplied or unpremultiplied colors.
  • 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.
  • decoder API: new function JxlDecoderSkipCurrentFrame to skip processing the current frame after a progressive detail is reached.
  • decoder API: new function JxlDecoderGetIntendedDownsamplingRatio to get the intended downsampling ratio of progressive steps, based on the information in the frame header.
  • decoder API: new function JxlDecoderSetRenderSpotcolors to allow disabling rendering of spot colors.
  • decoder/encoder API: add two fields to JXLBasicInfo: intrinsic_xsize and intrinsic_ysize to signal the intrinsic size.
  • encoder API: ability to add metadata boxes, added new functions JxlEncoderAddBox, JxlEncoderUseBoxes, JxlEncoderCloseBoxes and JxlEncoderCloseFrames.
  • encoder API: added ability to set several encoder options / extra fields to frames using JxlEncoderSetFrameName, JxlEncoderFrameSettingsSetOption, JxlEncoderFrameSettingsSetFloatOption.
  • encoder API: added ability to check required codestream compatibility level and force specified using JxlEncoderGetRequiredCodestreamLevel and JxlEncoderSetCodestreamLevel.
  • encoder API: added ability to force emitting box-based container format using JxlEncoderUseContainer.
  • encoder API: added ability to store JPEG metadata for lossless reconstruction using JxlEncoderStoreJPEGMetadata
  • 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.
  • encoder API: ability to encode arbitrary extra channels: JxlEncoderInitExtraChannelInfo, JxlEncoderSetExtraChannelInfo, JxlEncoderSetExtraChannelName and JxlEncoderSetExtraChannelBuffer.
  • encoder API: ability to plug custom CMS implementation using JxlEncoderSetCms(JxlEncoder* enc, JxlCmsInterface cms)
  • encoder API: added JxlEncoderGetError to retrieve last encoder error.

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 compatibility.
  • encoder API: JxlEncoderCloseInput now closes both frames and boxes input.
  • CLI: cjxl and djxl have been reimplemented on the base of public decoder and encoder API; dropped dependency on gflags for argument parsing.

Deprecated

  • decoder API: JXL_DEC_EXTENSIONS event: use JXL_DEC_BASIC_INFO
  • decoder / encoder API: pixel types JXL_TYPE_BOOLEAN and JXL_TYPE_UINT32: consider using JXL_TYPE_UINT8 and JXL_TYPE_FLOAT correspondingly.
  • decoder API: pixel format parameter for JxlDecoderGetColorAsEncodedProfile and JxlDecoderGetICCProfileSize: pass NULL.
  • decoder API: JxlDecoderDefaultPixelFormat
  • 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)
  • Security: Fix OOB copy (read/write) in out-of-order/multi-threaded decoding (#708 - 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 and 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.

[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.