3 All notable changes to this project will be documented in this file.
5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
11 - decoder API: new function `JxlDecoderSetImageBitDepth` to set the bit depth
13 - decoder API proposal: add `JxlDecoderSetOutputColorProfile` and
14 `JxlDecoderSetCms` to enable decoding to desired colorspace; NB: not
16 - encoder API: new function `JxlEncoderSetFrameBitDepth` to set the bit depth
18 - encoder API: add an effort 10 option for lossless compression; using this
19 setting requires calling `JxlEncoderAllowExpertOptions`.
20 - encoder API: new `JXL_ENC_FRAME_SETTING_JPEG_COMPRESS_BOXES` enum value to
21 allow explicit control of metadata compression
24 - common API: removed `JxlIntrinsicSizeHeader`
25 - decoder API: removed deprecated `JXL_DEC_NEED_DC_OUT_BUFFER` and
26 `JXL_DEC_DC_IMAGE` events, `JxlDecoderDCOutBufferSize` and
27 `JxlDecoderSetDCOutBuffer` functions
29 ### Changed / clarified
30 - encoder API: `JxlEncoderProcessOutput` requires at least 32 bytes of output
31 space to proceed and guarantees that at least one byte will be written
35 - Export version information in headers.
36 - decoder API: Ability to decode the content of metadata boxes:
37 `JXL_DEC_BOX`, `JXL_DEC_BOX_NEED_MORE_OUTPUT`, `JxlDecoderSetBoxBuffer`,
38 `JxlDecoderGetBoxType`, `JxlDecoderGetBoxSizeRaw` and
39 `JxlDecoderSetDecompressBoxes`.
40 - decoder API: ability to mark the input is finished: `JxlDecoderCloseInput`.
41 - decoder API: ability to request updates on different progressive events using
42 `JxlDecoderSetProgressiveDetail`; currently supported events are
43 `kDC`, `kLastPasses` and `kPasses`.
44 - decoder API: ability to specify desired intensity target using
45 `JxlDecoderSetDesiredIntensityTarget`
46 - decoder API: new function `JxlDecoderSetCoalesced` to allow decoding
47 non-coalesced (unblended) frames, e.g. layers of a composite still image
48 or the cropped frames of a recompressed GIF/APNG.
49 - decoder API: new function `JxlDecoderSetUnpremultiplyAlpha` to set
50 preference for getting an associated alpha channel with premultiplied or
51 unpremultiplied colors.
52 - decoder API: field added to `JxlFrameHeader`: a `JxlLayerInfo` struct
53 that contains crop dimensions and offsets and blending information for
54 the non-coalesced case.
55 - decoder API: new function `JxlDecoderGetExtraChannelBlendInfo` to get
56 the blending information for extra channels in the non-coalesced case.
57 - decoder API: new function `JxlDecoderSetMultithreadedImageOutCallback`,
58 allowing output callbacks to receive more information about the number of
59 threads on which they are running.
60 - decoder API: new function `JxlDecoderSkipCurrentFrame` to skip processing
61 the current frame after a progressive detail is reached.
62 - decoder API: new function `JxlDecoderGetIntendedDownsamplingRatio` to get
63 the intended downsampling ratio of progressive steps, based on the
64 information in the frame header.
65 - decoder API: new function `JxlDecoderSetRenderSpotcolors` to allow disabling
66 rendering of spot colors.
67 - decoder/encoder API: add two fields to `JXLBasicInfo`: `intrinsic_xsize`
68 and `intrinsic_ysize` to signal the intrinsic size.
69 - encoder API: ability to add metadata boxes, added new functions
70 `JxlEncoderAddBox`, `JxlEncoderUseBoxes`, `JxlEncoderCloseBoxes` and
71 `JxlEncoderCloseFrames`.
72 - encoder API: added ability to set several encoder options / extra fields to
73 frames using `JxlEncoderSetFrameName`, `JxlEncoderFrameSettingsSetOption`,
74 `JxlEncoderFrameSettingsSetFloatOption`.
75 - encoder API: added ability to check required codestream compatibility level
76 and force specified using `JxlEncoderGetRequiredCodestreamLevel` and
77 `JxlEncoderSetCodestreamLevel`.
78 - encoder API: added ability to force emitting box-based container format
79 using `JxlEncoderUseContainer`.
80 - encoder API: added ability to store JPEG metadata for lossless reconstruction
81 using `JxlEncoderStoreJPEGMetadata`
82 - encoder API: new functions `JxlEncoderSetFrameHeader` and
83 `JxlEncoderSetExtraChannelBlendInfo` to set animation
84 and blending parameters of the frame, and `JxlEncoderInitFrameHeader` and
85 `JxlEncoderInitBlendInfo` to initialize the structs to set.
86 - encoder API: ability to encode arbitrary extra channels:
87 `JxlEncoderInitExtraChannelInfo`, `JxlEncoderSetExtraChannelInfo`,
88 `JxlEncoderSetExtraChannelName` and `JxlEncoderSetExtraChannelBuffer`.
89 - encoder API: ability to plug custom CMS implementation using
90 `JxlEncoderSetCms(JxlEncoder* enc, JxlCmsInterface cms)`
91 - encoder API: added `JxlEncoderGetError` to retrieve last encoder error.
94 - decoder API: using `JxlDecoderCloseInput` at the end of all input is required
95 when using JXL_DEC_BOX, and is now also encouraged in other cases, but not
96 required in those other cases for backwards compatibility.
97 - encoder API: `JxlEncoderCloseInput` now closes both frames and boxes input.
98 - CLI: `cjxl` and `djxl` have been reimplemented on the base of public decoder
99 and encoder API; dropped dependency on `gflags` for argument parsing.
102 - decoder API: `JXL_DEC_EXTENSIONS` event: use `JXL_DEC_BASIC_INFO`
103 - decoder / encoder API: pixel types `JXL_TYPE_BOOLEAN` and `JXL_TYPE_UINT32`:
104 consider using `JXL_TYPE_UINT8` and `JXL_TYPE_FLOAT` correspondingly.
105 - decoder API: pixel format parameter for `JxlDecoderGetColorAsEncodedProfile`
106 and `JxlDecoderGetICCProfileSize`: pass `NULL`.
107 - decoder API: `JxlDecoderDefaultPixelFormat`
108 - encoder API: `JxlEncoderOptions`: use `JxlEncoderFrameSettings` instead.
109 - encoder API: `JxlEncoderOptionsCreate`: use `JxlEncoderFrameSettingsCreate`
111 - encoder API: `JxlEncoderOptionsSetDistance`: use `JxlEncoderSetFrameDistance`
113 - encoder API: `JxlEncoderOptionsSetLossless`: use `JxlEncoderSetFrameLossless`
115 - encoder API: `JxlEncoderOptionsSetEffort`: use
116 `JxlEncoderFrameSettingsSetOption(frame_settings, JXL_ENC_FRAME_SETTING_EFFORT, effort)`
118 - encoder API: `JxlEncoderOptionsSetDecodingSpeed`: use
119 `JxlEncoderFrameSettingsSetOption(frame_settings, JXL_ENC_FRAME_SETTING_DECODING_SPEED, tier)`
121 - encoder API: deprecated `JXL_ENC_NOT_SUPPORTED`, the encoder returns
122 `JXL_ENC_ERROR` instead and there is no need to handle
123 `JXL_ENC_NOT_SUPPORTED`.
125 ## [0.6.1] - 2021-10-29
127 - Security: Fix OOB read in splines rendering (#735 -
128 [CVE-2021-22563](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22563))
129 - Security: Fix OOB copy (read/write) in out-of-order/multi-threaded decoding
130 (#708 - [CVE-2021-22564](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22564))
131 - Fix segfault in `djxl` tool with `--allow_partial_files` flag (#781).
132 - Fix border in extra channels when using upsampling (#796)
134 ## [0.6] - 2021-10-04
136 - API: New functions to decode extra channels:
137 `JxlDecoderExtraChannelBufferSize` and `JxlDecoderSetExtraChannelBuffer`.
138 - API: New function `JxlEncoderInitBasicInfo` to initialize `JxlBasicInfo`
139 (only needed when encoding). NOTE: it is now required to call this function
140 when using the encoder. Padding was added to the struct for forward
142 - API: Support for encoding oriented images.
143 - API: FLOAT16 support in the encoder API.
144 - Rewrite of the GDK pixbuf loader plugin. Added proper color management and
146 - Rewrite of GIMP plugin. Added compression parameters dialog and switched to
147 using the public C API.
148 - Debian packages for GDK pixbuf loader (`libjxl-gdk-pixbuf`) and GIMP
149 (`libjxl-gimp-plugin`) plugins.
150 - `cjxl`/`djxl` support for `stdin` and `stdout`.
153 - API: Renamed the field `alpha_associated` in `JxlExtraChannelInfo` to
154 `alpha_premultiplied`, to match the corresponding name in `JxlBasicInfo`.
155 - Improved the 2x2 downscaling method in the encoder for the optional color
156 channel resampling for low bit rates.
157 - Fixed: the combination of floating point original data, XYB color encoding,
158 and Modular mode was broken (in both encoder and decoder). It now works.
159 NOTE: this can cause the current encoder to write jxl bitstreams that do
160 not decode with the old decoder. In particular this will happen when using
161 cjxl with PFM, EXR, or floating point PSD input, and a combination of XYB
162 and modular mode is used (which caused an encoder error before), e.g.
163 using options like `-m -q 80` (lossy modular), `-d 4.5` or `--progressive_dc=1`
164 (modular DC frame), or default lossy encoding on an image where patches
165 end up being used. There is no problem when using cjxl with PNG, JPEG, GIF,
166 APNG, PPM, PGM, PGX, or integer (8-bit or 16-bit) PSD input.
167 - `libjxl` static library now bundles skcms, fixing static linking in
168 downstream projects when skcms is used.
169 - Spline rendering performance improvements.
170 - Butteraugli changes for less visual masking.
172 ## [0.5] - 2021-08-02
174 - API: New function to decode the image using a callback outputting a part of a
176 - API: 16-bit float output support.
177 - API: `JxlDecoderRewind` and `JxlDecoderSkipFrames` functions to skip more
178 efficiently to earlier animation frames.
179 - API: `JxlDecoderSetPreferredColorProfile` function to choose color profile in
180 certain circumstances.
181 - encoder: Adding `center_x` and `center_y` flags for more control of the tile
183 - New encoder speeds `lightning` (1) and `thunder` (2).
186 - Re-licensed the project under a BSD 3-Clause license. See the
187 [LICENSE](LICENSE) and [PATENTS](PATENTS) files for details.
188 - Full JPEG XL part 1 specification support: Implemented all the spec required
189 to decode files to pixels, including cases that are not used by the encoder
190 yet. Part 2 of the spec (container format) is final but not fully implemented
192 - Butteraugli metric improvements. Exact numbers are different from previous
194 - Memory reductions during decoding.
195 - Reduce the size of the jxl_dec library by removing dependencies.
196 - A few encoding speedups.
197 - Clarify the security policy.
198 - Significant encoding improvements (~5 %) and less ringing.
199 - Butteraugli metric to have some less masking.
200 - `cjxl` flag `--speed` is deprecated and replaced by the `--effort` synonym.
203 - API for returning a downsampled DC was deprecated
204 (`JxlDecoderDCOutBufferSize` and `JxlDecoderSetDCOutBuffer`) and will be
205 removed in the next release.
207 ## [0.3.7] - 2021-03-29
209 - Fix a rounding issue in 8-bit decoding.
211 ## [0.3.6] - 2021-03-25
213 - Fix a bug that could result in the generation of invalid codestreams as
214 well as failure to decode valid streams.
216 ## [0.3.5] - 2021-03-23
218 - New encode-time options for faster decoding at the cost of quality.
219 - Man pages for cjxl and djxl.
222 - Memory usage improvements.
223 - Faster decoding to 8-bit output with the C API.
224 - GIMP plugin: avoid the sRGB conversion dialog for sRGB images, do not show
225 a console window on Windows.
228 ## [0.3.4] - 2021-03-16
230 - Improved box parsing.
231 - Improved metadata handling.
232 - Performance and memory usage improvements.
234 ## [0.3.3] - 2021-03-05
236 - Performance improvements for small images.
237 - Add a (flag-protected) non-high-precision mode with better speed.
238 - Significantly speed up the PQ EOTF.
239 - Allow optional HDR tone mapping in djxl (--tone_map, --display_nits).
240 - Change the behavior of djxl -j to make it consistent with cjxl (#153).
241 - Improve image quality.
242 - Improve EXIF handling.
244 ## [0.3.2] - 2021-02-12
246 - Fix embedded ICC encoding regression
247 [#149](https://gitlab.com/wg1/jpeg-xl/-/issues/149).
249 ## [0.3.1] - 2021-02-10
251 - New experimental Butteraugli API (`jxl/butteraugli.h`).
252 - Encoder improvements to low quality settings.
253 - Bug fixes, including fuzzer-found potential security bug fixes.
254 - Fixed `-q 100` and `-d 0` not triggering lossless modes.
256 ## [0.3] - 2021-01-29
258 - Minor change to the Decoder C API to accommodate future work for other ways
260 - Future decoder C API changes will be backwards compatible.
261 - Lots of bug fixes since the previous version.
263 ## [0.2] - 2020-12-24
265 - JPEG XL bitstream format is frozen. Files encoded with 0.2 will be supported
269 - Files encoded with previous versions are not supported.
271 ## [0.1.1] - 2020-12-01
273 ## [0.1] - 2020-11-14
275 - Initial release of an encoder (`cjxl`) and decoder (`djxl`) that work
276 together as well as a benchmark tool for comparison with other codecs
278 - Note: JPEG XL format is in the final stages of standardization, minor changes
279 to the codestream format are still possible but we are not expecting any
280 changes beyond what is required by bug fixing.
281 - API: new decoder API in C, check the `examples/` directory for its example
282 usage. The C API is a work in progress and likely to change both in API and
283 ABI in future releases.